From f1f52e75939b56c40b3d153ae99faf2720250242 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 10 May 2011 02:28:45 -0700 Subject: isci: uplevel request infrastructure * Consolidate tiny header files * Move files out of core/ (drop core/scic_sds_ prefix) * Merge core/scic_sds_request.[ch] into request.[ch] * Cleanup request.c namespace (clean forward declarations and global namespace pollution) Reported-by: Christoph Hellwig Signed-off-by: Dan Williams --- drivers/scsi/isci/request.c | 3124 +++++++++++++++++++++++++++++++------------ 1 file changed, 2255 insertions(+), 869 deletions(-) (limited to 'drivers/scsi/isci/request.c') diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c index 4961ee347091..857ad067f11c 100644 --- a/drivers/scsi/isci/request.c +++ b/drivers/scsi/isci/request.c @@ -54,898 +54,1286 @@ */ #include "isci.h" -#include "scic_io_request.h" -#include "scic_task_request.h" #include "scic_port.h" #include "task.h" #include "request.h" #include "sata.h" #include "scu_completion_codes.h" -#include "scic_sds_request.h" #include "sas.h" -static enum sci_status isci_request_ssp_request_construct( - struct isci_request *request) -{ - enum sci_status status; +/** + * This method returns the sgl element pair for the specificed sgl_pair index. + * @sci_req: This parameter specifies the IO request for which to retrieve + * the Scatter-Gather List element pair. + * @sgl_pair_index: This parameter specifies the index into the SGL element + * pair to be retrieved. + * + * This method returns a pointer to an struct scu_sgl_element_pair. + */ +static struct scu_sgl_element_pair *scic_sds_request_get_sgl_element_pair( + struct scic_sds_request *sci_req, + u32 sgl_pair_index + ) { + struct scu_task_context *task_context; + + task_context = (struct scu_task_context *)sci_req->task_context_buffer; + + if (sgl_pair_index == 0) { + return &task_context->sgl_pair_ab; + } else if (sgl_pair_index == 1) { + return &task_context->sgl_pair_cd; + } - dev_dbg(&request->isci_host->pdev->dev, - "%s: request = %p\n", - __func__, - request); - status = scic_io_request_construct_basic_ssp(&request->sci); - return status; + return &sci_req->sg_table[sgl_pair_index - 2]; } -static enum sci_status isci_request_stp_request_construct( - struct isci_request *request) +/** + * This function will build the SGL list for an IO request. + * @sci_req: This parameter specifies the IO request for which to build + * the Scatter-Gather List. + * + */ +void scic_sds_request_build_sgl(struct scic_sds_request *sds_request) { - struct sas_task *task = isci_request_access_task(request); - enum sci_status status; - struct host_to_dev_fis *register_fis; - - dev_dbg(&request->isci_host->pdev->dev, - "%s: request = %p\n", - __func__, - request); + struct isci_request *isci_request = sci_req_to_ireq(sds_request); + struct isci_host *isci_host = isci_request->isci_host; + struct sas_task *task = isci_request_access_task(isci_request); + struct scatterlist *sg = NULL; + dma_addr_t dma_addr; + u32 sg_idx = 0; + struct scu_sgl_element_pair *scu_sg = NULL; + struct scu_sgl_element_pair *prev_sg = NULL; + + if (task->num_scatter > 0) { + sg = task->scatter; + + while (sg) { + scu_sg = scic_sds_request_get_sgl_element_pair( + sds_request, + sg_idx); + + SCU_SGL_COPY(scu_sg->A, sg); + + sg = sg_next(sg); + + if (sg) { + SCU_SGL_COPY(scu_sg->B, sg); + sg = sg_next(sg); + } else + SCU_SGL_ZERO(scu_sg->B); + + if (prev_sg) { + dma_addr = + scic_io_request_get_dma_addr( + sds_request, + scu_sg); + + prev_sg->next_pair_upper = + upper_32_bits(dma_addr); + prev_sg->next_pair_lower = + lower_32_bits(dma_addr); + } + + prev_sg = scu_sg; + sg_idx++; + } + } else { /* handle when no sg */ + scu_sg = scic_sds_request_get_sgl_element_pair(sds_request, + sg_idx); - /* Get the host_to_dev_fis from the core and copy - * the fis from the task into it. - */ - register_fis = isci_sata_task_to_fis_copy(task); + dma_addr = dma_map_single(&isci_host->pdev->dev, + task->scatter, + task->total_xfer_len, + task->data_dir); - status = scic_io_request_construct_basic_sata(&request->sci); + isci_request->zero_scatter_daddr = dma_addr; - /* Set the ncq tag in the fis, from the queue - * command in the task. - */ - if (isci_sata_is_task_ncq(task)) { + scu_sg->A.length = task->total_xfer_len; + scu_sg->A.address_upper = upper_32_bits(dma_addr); + scu_sg->A.address_lower = lower_32_bits(dma_addr); + } - isci_sata_set_ncq_tag( - register_fis, - task - ); + if (scu_sg) { + scu_sg->next_pair_upper = 0; + scu_sg->next_pair_lower = 0; } +} - return status; +static void scic_sds_ssp_io_request_assign_buffers(struct scic_sds_request *sci_req) +{ + if (sci_req->was_tag_assigned_by_user == false) + sci_req->task_context_buffer = &sci_req->tc; } -/* - * isci_smp_request_build() - This function builds the smp request. - * @ireq: This parameter points to the isci_request allocated in the - * request construct function. - * - * SCI_SUCCESS on successfull completion, or specific failure code. - */ -static enum sci_status isci_smp_request_build(struct isci_request *ireq) +static void scic_sds_io_request_build_ssp_command_iu(struct scic_sds_request *sci_req) { - enum sci_status status = SCI_FAILURE; + struct ssp_cmd_iu *cmd_iu; + struct isci_request *ireq = sci_req_to_ireq(sci_req); struct sas_task *task = isci_request_access_task(ireq); - struct scic_sds_request *sci_req = &ireq->sci; - dev_dbg(&ireq->isci_host->pdev->dev, - "%s: request = %p\n", __func__, ireq); + cmd_iu = &sci_req->ssp.cmd; - dev_dbg(&ireq->isci_host->pdev->dev, - "%s: smp_req len = %d\n", - __func__, - task->smp_task.smp_req.length); + memcpy(cmd_iu->LUN, task->ssp_task.LUN, 8); + cmd_iu->add_cdb_len = 0; + cmd_iu->_r_a = 0; + cmd_iu->_r_b = 0; + cmd_iu->en_fburst = 0; /* unsupported */ + cmd_iu->task_prio = task->ssp_task.task_prio; + cmd_iu->task_attr = task->ssp_task.task_attr; + cmd_iu->_r_c = 0; - /* copy the smp_command to the address; */ - sg_copy_to_buffer(&task->smp_task.smp_req, 1, - &sci_req->smp.cmd, - sizeof(struct smp_req)); + sci_swab32_cpy(&cmd_iu->cdb, task->ssp_task.cdb, + sizeof(task->ssp_task.cdb) / sizeof(u32)); +} - status = scic_io_request_construct_smp(sci_req); - if (status != SCI_SUCCESS) - dev_warn(&ireq->isci_host->pdev->dev, - "%s: failed with status = %d\n", - __func__, - status); +static void scic_sds_task_request_build_ssp_task_iu(struct scic_sds_request *sci_req) +{ + struct ssp_task_iu *task_iu; + struct isci_request *ireq = sci_req_to_ireq(sci_req); + struct sas_task *task = isci_request_access_task(ireq); + struct isci_tmf *isci_tmf = isci_request_access_tmf(ireq); - return status; + task_iu = &sci_req->ssp.tmf; + + memset(task_iu, 0, sizeof(struct ssp_task_iu)); + + memcpy(task_iu->LUN, task->ssp_task.LUN, 8); + + task_iu->task_func = isci_tmf->tmf_code; + task_iu->task_tag = + (ireq->ttype == tmf_task) ? + isci_tmf->io_tag : + SCI_CONTROLLER_INVALID_IO_TAG; } /** - * isci_io_request_build() - This function builds the io request object. - * @isci_host: This parameter specifies the ISCI host object - * @request: This parameter points to the isci_request object allocated in the - * request construct function. - * @sci_device: This parameter is the handle for the sci core's remote device - * object that is the destination for this request. + * This method is will fill in the SCU Task Context for any type of SSP request. + * @sci_req: + * @task_context: * - * SCI_SUCCESS on successfull completion, or specific failure code. */ -static enum sci_status isci_io_request_build( - struct isci_host *isci_host, - struct isci_request *request, - struct isci_remote_device *isci_device) +static void scu_ssp_reqeust_construct_task_context( + struct scic_sds_request *sds_request, + struct scu_task_context *task_context) { - enum sci_status status = SCI_SUCCESS; - struct sas_task *task = isci_request_access_task(request); - struct scic_sds_remote_device *sci_device = &isci_device->sci; + dma_addr_t dma_addr; + struct scic_sds_controller *controller; + struct scic_sds_remote_device *target_device; + struct scic_sds_port *target_port; + + controller = scic_sds_request_get_controller(sds_request); + target_device = scic_sds_request_get_device(sds_request); + target_port = scic_sds_request_get_port(sds_request); + + /* Fill in the TC with the its required data */ + task_context->abort = 0; + task_context->priority = 0; + task_context->initiator_request = 1; + task_context->connection_rate = target_device->connection_rate; + task_context->protocol_engine_index = + scic_sds_controller_get_protocol_engine_group(controller); + task_context->logical_port_index = + scic_sds_port_get_index(target_port); + task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_SSP; + task_context->valid = SCU_TASK_CONTEXT_VALID; + task_context->context_type = SCU_TASK_CONTEXT_TYPE; + + task_context->remote_node_index = + scic_sds_remote_device_get_index(sds_request->target_device); + task_context->command_code = 0; + + task_context->link_layer_control = 0; + task_context->do_not_dma_ssp_good_response = 1; + task_context->strict_ordering = 0; + task_context->control_frame = 0; + task_context->timeout_enable = 0; + task_context->block_guard_enable = 0; + + task_context->address_modifier = 0; + + /* task_context->type.ssp.tag = sci_req->io_tag; */ + task_context->task_phase = 0x01; + + if (sds_request->was_tag_assigned_by_user) { + /* + * Build the task context now since we have already read + * the data + */ + sds_request->post_context = + (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC | + (scic_sds_controller_get_protocol_engine_group( + controller) << + SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) | + (scic_sds_port_get_index(target_port) << + SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) | + scic_sds_io_tag_get_index(sds_request->io_tag)); + } else { + /* + * Build the task context now since we have already read + * the data + * + * I/O tag index is not assigned because we have to wait + * until we get a TCi + */ + sds_request->post_context = + (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC | + (scic_sds_controller_get_protocol_engine_group( + owning_controller) << + SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) | + (scic_sds_port_get_index(target_port) << + SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT)); + } - dev_dbg(&isci_host->pdev->dev, - "%s: isci_device = 0x%p; request = %p, " - "num_scatter = %d\n", - __func__, - isci_device, - request, - task->num_scatter); + /* + * Copy the physical address for the command buffer to the + * SCU Task Context + */ + dma_addr = scic_io_request_get_dma_addr(sds_request, + &sds_request->ssp.cmd); - /* map the sgl addresses, if present. - * libata does the mapping for sata devices - * before we get the request. + task_context->command_iu_upper = upper_32_bits(dma_addr); + task_context->command_iu_lower = lower_32_bits(dma_addr); + + /* + * Copy the physical address for the response buffer to the + * SCU Task Context */ - if (task->num_scatter && - !sas_protocol_ata(task->task_proto) && - !(SAS_PROTOCOL_SMP & task->task_proto)) { + dma_addr = scic_io_request_get_dma_addr(sds_request, + &sds_request->ssp.rsp); - request->num_sg_entries = dma_map_sg( - &isci_host->pdev->dev, - task->scatter, - task->num_scatter, - task->data_dir - ); + task_context->response_iu_upper = upper_32_bits(dma_addr); + task_context->response_iu_lower = lower_32_bits(dma_addr); +} - if (request->num_sg_entries == 0) - return SCI_FAILURE_INSUFFICIENT_RESOURCES; - } +/** + * This method is will fill in the SCU Task Context for a SSP IO request. + * @sci_req: + * + */ +static void scu_ssp_io_request_construct_task_context( + struct scic_sds_request *sci_req, + enum dma_data_direction dir, + u32 len) +{ + struct scu_task_context *task_context; - /* build the common request object. For now, - * we will let the core allocate the IO tag. - */ - status = scic_io_request_construct(&isci_host->sci, sci_device, - SCI_CONTROLLER_INVALID_IO_TAG, - &request->sci); + task_context = scic_sds_request_get_task_context(sci_req); - if (status != SCI_SUCCESS) { - dev_warn(&isci_host->pdev->dev, - "%s: failed request construct\n", - __func__); - return SCI_FAILURE; - } + scu_ssp_reqeust_construct_task_context(sci_req, task_context); - switch (task->task_proto) { - case SAS_PROTOCOL_SMP: - status = isci_smp_request_build(request); - break; - case SAS_PROTOCOL_SSP: - status = isci_request_ssp_request_construct(request); + task_context->ssp_command_iu_length = + sizeof(struct ssp_cmd_iu) / sizeof(u32); + task_context->type.ssp.frame_type = SSP_COMMAND; + + switch (dir) { + case DMA_FROM_DEVICE: + case DMA_NONE: + default: + task_context->task_type = SCU_TASK_TYPE_IOREAD; break; - case SAS_PROTOCOL_SATA: - case SAS_PROTOCOL_STP: - case SAS_PROTOCOL_SATA | SAS_PROTOCOL_STP: - status = isci_request_stp_request_construct(request); + case DMA_TO_DEVICE: + task_context->task_type = SCU_TASK_TYPE_IOWRITE; break; - default: - dev_warn(&isci_host->pdev->dev, - "%s: unknown protocol\n", __func__); - return SCI_FAILURE; } - return SCI_SUCCESS; + task_context->transfer_length_bytes = len; + + if (task_context->transfer_length_bytes > 0) + scic_sds_request_build_sgl(sci_req); } +static void scic_sds_ssp_task_request_assign_buffers(struct scic_sds_request *sci_req) +{ + if (sci_req->was_tag_assigned_by_user == false) + sci_req->task_context_buffer = &sci_req->tc; +} /** - * isci_request_alloc_core() - This function gets the request object from the - * isci_host dma cache. - * @isci_host: This parameter specifies the ISCI host object - * @isci_request: This parameter will contain the pointer to the new - * isci_request object. - * @isci_device: This parameter is the pointer to the isci remote device object - * that is the destination for this request. - * @gfp_flags: This parameter specifies the os allocation flags. + * This method will fill in the SCU Task Context for a SSP Task request. The + * following important settings are utilized: -# priority == + * SCU_TASK_PRIORITY_HIGH. This ensures that the task request is issued + * ahead of other task destined for the same Remote Node. -# task_type == + * SCU_TASK_TYPE_IOREAD. This simply indicates that a normal request type + * (i.e. non-raw frame) is being utilized to perform task management. -# + * control_frame == 1. This ensures that the proper endianess is set so + * that the bytes are transmitted in the right order for a task frame. + * @sci_req: This parameter specifies the task request object being + * constructed. * - * SCI_SUCCESS on successfull completion, or specific failure code. */ -static int isci_request_alloc_core( - struct isci_host *isci_host, - struct isci_request **isci_request, - struct isci_remote_device *isci_device, - gfp_t gfp_flags) +static void scu_ssp_task_request_construct_task_context( + struct scic_sds_request *sci_req) { - int ret = 0; - dma_addr_t handle; - struct isci_request *request; - - - /* get pointer to dma memory. This actually points - * to both the isci_remote_device object and the - * sci object. The isci object is at the beginning - * of the memory allocated here. - */ - request = dma_pool_alloc(isci_host->dma_pool, gfp_flags, &handle); - if (!request) { - dev_warn(&isci_host->pdev->dev, - "%s: dma_pool_alloc returned NULL\n", __func__); - return -ENOMEM; - } - - /* initialize the request object. */ - spin_lock_init(&request->state_lock); - request->request_daddr = handle; - request->isci_host = isci_host; - request->isci_device = isci_device; - request->io_request_completion = NULL; - request->terminated = false; - - request->num_sg_entries = 0; - - request->complete_in_target = false; + struct scu_task_context *task_context; - INIT_LIST_HEAD(&request->completed_node); - INIT_LIST_HEAD(&request->dev_node); + task_context = scic_sds_request_get_task_context(sci_req); - *isci_request = request; - isci_request_change_state(request, allocated); + scu_ssp_reqeust_construct_task_context(sci_req, task_context); - return ret; + task_context->control_frame = 1; + task_context->priority = SCU_TASK_PRIORITY_HIGH; + task_context->task_type = SCU_TASK_TYPE_RAW_FRAME; + task_context->transfer_length_bytes = 0; + task_context->type.ssp.frame_type = SSP_TASK; + task_context->ssp_command_iu_length = + sizeof(struct ssp_task_iu) / sizeof(u32); } -static int isci_request_alloc_io( - struct isci_host *isci_host, - struct sas_task *task, - struct isci_request **isci_request, - struct isci_remote_device *isci_device, - gfp_t gfp_flags) -{ - int retval = isci_request_alloc_core(isci_host, isci_request, - isci_device, gfp_flags); - if (!retval) { - (*isci_request)->ttype_ptr.io_task_ptr = task; - (*isci_request)->ttype = io_task; +/** + * This method constructs the SSP Command IU data for this ssp passthrough + * comand request object. + * @sci_req: This parameter specifies the request object for which the SSP + * command information unit is being built. + * + * enum sci_status, returns invalid parameter is cdb > 16 + */ - task->lldd_task = *isci_request; - } - return retval; -} /** - * isci_request_alloc_tmf() - This function gets the request object from the - * isci_host dma cache and initializes the relevant fields as a sas_task. - * @isci_host: This parameter specifies the ISCI host object - * @sas_task: This parameter is the task struct from the upper layer driver. - * @isci_request: This parameter will contain the pointer to the new - * isci_request object. - * @isci_device: This parameter is the pointer to the isci remote device object - * that is the destination for this request. - * @gfp_flags: This parameter specifies the os allocation flags. + * This method constructs the SATA request object. + * @sci_req: + * @sat_protocol: + * @transfer_length: + * @data_direction: + * @copy_rx_frame: * - * SCI_SUCCESS on successfull completion, or specific failure code. + * enum sci_status */ -int isci_request_alloc_tmf( - struct isci_host *isci_host, - struct isci_tmf *isci_tmf, - struct isci_request **isci_request, - struct isci_remote_device *isci_device, - gfp_t gfp_flags) +static enum sci_status +scic_io_request_construct_sata(struct scic_sds_request *sci_req, + u32 len, + enum dma_data_direction dir, + bool copy) { - int retval = isci_request_alloc_core(isci_host, isci_request, - isci_device, gfp_flags); + enum sci_status status = SCI_SUCCESS; + struct isci_request *ireq = sci_req_to_ireq(sci_req); + struct sas_task *task = isci_request_access_task(ireq); - if (!retval) { + /* check for management protocols */ + if (ireq->ttype == tmf_task) { + struct isci_tmf *tmf = isci_request_access_tmf(ireq); - (*isci_request)->ttype_ptr.tmf_task_ptr = isci_tmf; - (*isci_request)->ttype = tmf_task; + if (tmf->tmf_code == isci_tmf_sata_srst_high || + tmf->tmf_code == isci_tmf_sata_srst_low) + return scic_sds_stp_soft_reset_request_construct(sci_req); + else { + dev_err(scic_to_dev(sci_req->owning_controller), + "%s: Request 0x%p received un-handled SAT " + "management protocol 0x%x.\n", + __func__, sci_req, tmf->tmf_code); + + return SCI_FAILURE; + } } - return retval; -} -/** - * isci_request_execute() - This function allocates the isci_request object, - * all fills in some common fields. - * @isci_host: This parameter specifies the ISCI host object - * @sas_task: This parameter is the task struct from the upper layer driver. - * @isci_request: This parameter will contain the pointer to the new - * isci_request object. - * @gfp_flags: This parameter specifies the os allocation flags. - * - * SCI_SUCCESS on successfull completion, or specific failure code. - */ -int isci_request_execute( - struct isci_host *isci_host, - struct sas_task *task, - struct isci_request **isci_request, - gfp_t gfp_flags) + if (!sas_protocol_ata(task->task_proto)) { + dev_err(scic_to_dev(sci_req->owning_controller), + "%s: Non-ATA protocol in SATA path: 0x%x\n", + __func__, + task->task_proto); + return SCI_FAILURE; + + } + + /* non data */ + if (task->data_dir == DMA_NONE) + return scic_sds_stp_non_data_request_construct(sci_req); + + /* NCQ */ + if (task->ata_task.use_ncq) + return scic_sds_stp_ncq_request_construct(sci_req, len, dir); + + /* DMA */ + if (task->ata_task.dma_xfer) + return scic_sds_stp_udma_request_construct(sci_req, len, dir); + else /* PIO */ + return scic_sds_stp_pio_request_construct(sci_req, copy); + + return status; +} + +static enum sci_status scic_io_request_construct_basic_ssp(struct scic_sds_request *sci_req) { - int ret = 0; - struct scic_sds_remote_device *sci_device; - enum sci_status status = SCI_FAILURE_UNSUPPORTED_PROTOCOL; - struct isci_remote_device *isci_device; - struct isci_request *request; - unsigned long flags; + struct isci_request *ireq = sci_req_to_ireq(sci_req); + struct sas_task *task = isci_request_access_task(ireq); - isci_device = task->dev->lldd_dev; - sci_device = &isci_device->sci; + sci_req->protocol = SCIC_SSP_PROTOCOL; - /* do common allocation and init of request object. */ - ret = isci_request_alloc_io( - isci_host, - task, - &request, - isci_device, - gfp_flags - ); + scu_ssp_io_request_construct_task_context(sci_req, + task->data_dir, + task->total_xfer_len); - if (ret) - goto out; + scic_sds_io_request_build_ssp_command_iu(sci_req); - status = isci_io_request_build(isci_host, request, isci_device); - if (status != SCI_SUCCESS) { - dev_warn(&isci_host->pdev->dev, - "%s: request_construct failed - status = 0x%x\n", - __func__, - status); - goto out; - } + sci_base_state_machine_change_state( + &sci_req->state_machine, + SCI_BASE_REQUEST_STATE_CONSTRUCTED); - spin_lock_irqsave(&isci_host->scic_lock, flags); + return SCI_SUCCESS; +} - /* send the request, let the core assign the IO TAG. */ - status = scic_controller_start_io(&isci_host->sci, sci_device, - &request->sci, - SCI_CONTROLLER_INVALID_IO_TAG); - if (status != SCI_SUCCESS && - status != SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) { - dev_warn(&isci_host->pdev->dev, - "%s: failed request start (0x%x)\n", - __func__, status); - spin_unlock_irqrestore(&isci_host->scic_lock, flags); - goto out; - } +enum sci_status scic_task_request_construct_ssp( + struct scic_sds_request *sci_req) +{ + /* Construct the SSP Task SCU Task Context */ + scu_ssp_task_request_construct_task_context(sci_req); - /* Either I/O started OK, or the core has signaled that - * the device needs a target reset. - * - * In either case, hold onto the I/O for later. - * - * Update it's status and add it to the list in the - * remote device object. - */ - isci_request_change_state(request, started); - list_add(&request->dev_node, &isci_device->reqs_in_process); + /* Fill in the SSP Task IU */ + scic_sds_task_request_build_ssp_task_iu(sci_req); - if (status == SCI_SUCCESS) { - /* Save the tag for possible task mgmt later. */ - request->io_tag = scic_io_request_get_io_tag(&request->sci); - } else { - /* The request did not really start in the - * hardware, so clear the request handle - * here so no terminations will be done. - */ - request->terminated = true; - } - spin_unlock_irqrestore(&isci_host->scic_lock, flags); + sci_base_state_machine_change_state(&sci_req->state_machine, + SCI_BASE_REQUEST_STATE_CONSTRUCTED); - if (status == - SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) { - /* Signal libsas that we need the SCSI error - * handler thread to work on this I/O and that - * we want a device reset. - */ - spin_lock_irqsave(&task->task_state_lock, flags); - task->task_state_flags |= SAS_TASK_NEED_DEV_RESET; - spin_unlock_irqrestore(&task->task_state_lock, flags); + return SCI_SUCCESS; +} - /* Cause this task to be scheduled in the SCSI error - * handler thread. - */ - isci_execpath_callback(isci_host, task, - sas_task_abort); - /* Change the status, since we are holding - * the I/O until it is managed by the SCSI - * error handler. - */ - status = SCI_SUCCESS; - } +static enum sci_status scic_io_request_construct_basic_sata(struct scic_sds_request *sci_req) +{ + enum sci_status status; + struct scic_sds_stp_request *stp_req; + bool copy = false; + struct isci_request *isci_request = sci_req_to_ireq(sci_req); + struct sas_task *task = isci_request_access_task(isci_request); - out: - if (status != SCI_SUCCESS) { - /* release dma memory on failure. */ - isci_request_free(isci_host, request); - request = NULL; - ret = SCI_FAILURE; - } + stp_req = &sci_req->stp.req; + sci_req->protocol = SCIC_STP_PROTOCOL; - *isci_request = request; - return ret; + copy = (task->data_dir == DMA_NONE) ? false : true; + + status = scic_io_request_construct_sata(sci_req, + task->total_xfer_len, + task->data_dir, + copy); + + if (status == SCI_SUCCESS) + sci_base_state_machine_change_state(&sci_req->state_machine, + SCI_BASE_REQUEST_STATE_CONSTRUCTED); + + return status; } +enum sci_status scic_task_request_construct_sata(struct scic_sds_request *sci_req) +{ + enum sci_status status = SCI_SUCCESS; + struct isci_request *ireq = sci_req_to_ireq(sci_req); + + /* check for management protocols */ + if (ireq->ttype == tmf_task) { + struct isci_tmf *tmf = isci_request_access_tmf(ireq); + + if (tmf->tmf_code == isci_tmf_sata_srst_high || + tmf->tmf_code == isci_tmf_sata_srst_low) { + status = scic_sds_stp_soft_reset_request_construct(sci_req); + } else { + dev_err(scic_to_dev(sci_req->owning_controller), + "%s: Request 0x%p received un-handled SAT " + "Protocol 0x%x.\n", + __func__, sci_req, tmf->tmf_code); + + return SCI_FAILURE; + } + } + + if (status == SCI_SUCCESS) + sci_base_state_machine_change_state( + &sci_req->state_machine, + SCI_BASE_REQUEST_STATE_CONSTRUCTED); + + return status; +} + /** - * isci_request_process_response_iu() - This function sets the status and - * response iu, in the task struct, from the request object for the upper - * layer driver. - * @sas_task: This parameter is the task struct from the upper layer driver. - * @resp_iu: This parameter points to the response iu of the completed request. - * @dev: This parameter specifies the linux device struct. - * - * none. + * sci_req_tx_bytes - bytes transferred when reply underruns request + * @sci_req: request that was terminated early */ -static void isci_request_process_response_iu( - struct sas_task *task, - struct ssp_response_iu *resp_iu, - struct device *dev) +#define SCU_TASK_CONTEXT_SRAM 0x200000 +static u32 sci_req_tx_bytes(struct scic_sds_request *sci_req) { - dev_dbg(dev, - "%s: resp_iu = %p " - "resp_iu->status = 0x%x,\nresp_iu->datapres = %d " - "resp_iu->response_data_len = %x, " - "resp_iu->sense_data_len = %x\nrepsonse data: ", + struct scic_sds_controller *scic = sci_req->owning_controller; + u32 ret_val = 0; + + if (readl(&scic->smu_registers->address_modifier) == 0) { + void __iomem *scu_reg_base = scic->scu_registers; + + /* get the bytes of data from the Address == BAR1 + 20002Ch + (256*TCi) where + * BAR1 is the scu_registers + * 0x20002C = 0x200000 + 0x2c + * = start of task context SRAM + offset of (type.ssp.data_offset) + * TCi is the io_tag of struct scic_sds_request + */ + ret_val = readl(scu_reg_base + + (SCU_TASK_CONTEXT_SRAM + offsetof(struct scu_task_context, type.ssp.data_offset)) + + ((sizeof(struct scu_task_context)) * scic_sds_io_tag_get_index(sci_req->io_tag))); + } + + return ret_val; +} + +enum sci_status +scic_sds_request_start(struct scic_sds_request *request) +{ + if (request->device_sequence != + scic_sds_remote_device_get_sequence(request->target_device)) + return SCI_FAILURE; + + if (request->state_handlers->start_handler) + return request->state_handlers->start_handler(request); + + dev_warn(scic_to_dev(request->owning_controller), + "%s: SCIC IO Request requested to start while in wrong " + "state %d\n", + __func__, + sci_base_state_machine_get_state(&request->state_machine)); + + return SCI_FAILURE_INVALID_STATE; +} + +enum sci_status +scic_sds_io_request_terminate(struct scic_sds_request *request) +{ + if (request->state_handlers->abort_handler) + return request->state_handlers->abort_handler(request); + + dev_warn(scic_to_dev(request->owning_controller), + "%s: SCIC IO Request requested to abort while in wrong " + "state %d\n", __func__, - resp_iu, - resp_iu->status, - resp_iu->datapres, - resp_iu->response_data_len, - resp_iu->sense_data_len); + sci_base_state_machine_get_state(&request->state_machine)); - task->task_status.stat = resp_iu->status; + return SCI_FAILURE_INVALID_STATE; +} - /* libsas updates the task status fields based on the response iu. */ - sas_ssp_task_response(dev, task, resp_iu); +enum sci_status scic_sds_io_request_event_handler( + struct scic_sds_request *request, + u32 event_code) +{ + if (request->state_handlers->event_handler) + return request->state_handlers->event_handler(request, event_code); + + dev_warn(scic_to_dev(request->owning_controller), + "%s: SCIC IO Request given event code notification %x while " + "in wrong state %d\n", + __func__, + event_code, + sci_base_state_machine_get_state(&request->state_machine)); + + return SCI_FAILURE_INVALID_STATE; } /** - * isci_request_set_open_reject_status() - This function prepares the I/O - * completion for OPEN_REJECT conditions. - * @request: This parameter is the completed isci_request object. - * @response_ptr: This parameter specifies the service response for the I/O. - * @status_ptr: This parameter specifies the exec status for the I/O. - * @complete_to_host_ptr: This parameter specifies the action to be taken by - * the LLDD with respect to completing this request or forcing an abort - * condition on the I/O. - * @open_rej_reason: This parameter specifies the encoded reason for the - * abandon-class reject. * - * none. + * @sci_req: The SCIC_SDS_IO_REQUEST_T object for which the start + * operation is to be executed. + * @frame_index: The frame index returned by the hardware for the reqeust + * object. + * + * This method invokes the core state frame handler for the + * SCIC_SDS_IO_REQUEST_T object. enum sci_status */ -static void isci_request_set_open_reject_status( - struct isci_request *request, - struct sas_task *task, - enum service_response *response_ptr, - enum exec_status *status_ptr, - enum isci_completion_selection *complete_to_host_ptr, - enum sas_open_rej_reason open_rej_reason) +enum sci_status scic_sds_io_request_frame_handler( + struct scic_sds_request *request, + u32 frame_index) { - /* Task in the target is done. */ - request->complete_in_target = true; - *response_ptr = SAS_TASK_UNDELIVERED; - *status_ptr = SAS_OPEN_REJECT; - *complete_to_host_ptr = isci_perform_normal_io_completion; - task->task_status.open_rej_reason = open_rej_reason; + if (request->state_handlers->frame_handler) + return request->state_handlers->frame_handler(request, frame_index); + + dev_warn(scic_to_dev(request->owning_controller), + "%s: SCIC IO Request given unexpected frame %x while in " + "state %d\n", + __func__, + frame_index, + sci_base_state_machine_get_state(&request->state_machine)); + + scic_sds_controller_release_frame(request->owning_controller, frame_index); + return SCI_FAILURE_INVALID_STATE; } -/** - * isci_request_handle_controller_specific_errors() - This function decodes - * controller-specific I/O completion error conditions. - * @request: This parameter is the completed isci_request object. - * @response_ptr: This parameter specifies the service response for the I/O. - * @status_ptr: This parameter specifies the exec status for the I/O. - * @complete_to_host_ptr: This parameter specifies the action to be taken by - * the LLDD with respect to completing this request or forcing an abort - * condition on the I/O. - * - * none. +/* + * This function copies response data for requests returning response data + * instead of sense data. + * @sci_req: This parameter specifies the request object for which to copy + * the response data. */ -static void isci_request_handle_controller_specific_errors( - struct isci_remote_device *isci_device, - struct isci_request *request, - struct sas_task *task, - enum service_response *response_ptr, - enum exec_status *status_ptr, - enum isci_completion_selection *complete_to_host_ptr) +void scic_sds_io_request_copy_response(struct scic_sds_request *sci_req) { - unsigned int cstatus; + void *resp_buf; + u32 len; + struct ssp_response_iu *ssp_response; + struct isci_request *ireq = sci_req_to_ireq(sci_req); + struct isci_tmf *isci_tmf = isci_request_access_tmf(ireq); - cstatus = scic_request_get_controller_status(&request->sci); + ssp_response = &sci_req->ssp.rsp; - dev_dbg(&request->isci_host->pdev->dev, - "%s: %p SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR " - "- controller status = 0x%x\n", - __func__, request, cstatus); + resp_buf = &isci_tmf->resp.resp_iu; - /* Decode the controller-specific errors; most - * important is to recognize those conditions in which - * the target may still have a task outstanding that - * must be aborted. - * - * Note that there are SCU completion codes being - * named in the decode below for which SCIC has already - * done work to handle them in a way other than as - * a controller-specific completion code; these are left - * in the decode below for completeness sake. - */ - switch (cstatus) { - case SCU_TASK_DONE_DMASETUP_DIRERR: - /* Also SCU_TASK_DONE_SMP_FRM_TYPE_ERR: */ - case SCU_TASK_DONE_XFERCNT_ERR: - /* Also SCU_TASK_DONE_SMP_UFI_ERR: */ - if (task->task_proto == SAS_PROTOCOL_SMP) { - /* SCU_TASK_DONE_SMP_UFI_ERR == Task Done. */ - *response_ptr = SAS_TASK_COMPLETE; + len = min_t(u32, + SSP_RESP_IU_MAX_SIZE, + be32_to_cpu(ssp_response->response_data_len)); - /* See if the device has been/is being stopped. Note - * that we ignore the quiesce state, since we are - * concerned about the actual device state. - */ - if ((isci_device->status == isci_stopping) || - (isci_device->status == isci_stopped)) - *status_ptr = SAS_DEVICE_UNKNOWN; - else - *status_ptr = SAS_ABORTED_TASK; + memcpy(resp_buf, ssp_response->resp_data, len); +} - request->complete_in_target = true; +/* + * This method implements the action taken when a constructed + * SCIC_SDS_IO_REQUEST_T object receives a scic_sds_request_start() request. + * This method will, if necessary, allocate a TCi for the io request object and + * then will, if necessary, copy the constructed TC data into the actual TC + * buffer. If everything is successful the post context field is updated with + * the TCi so the controller can post the request to the hardware. enum sci_status + * SCI_SUCCESS SCI_FAILURE_INSUFFICIENT_RESOURCES + */ +static enum sci_status scic_sds_request_constructed_state_start_handler( + struct scic_sds_request *request) +{ + struct scu_task_context *task_context; - *complete_to_host_ptr = - isci_perform_normal_io_completion; - } else { - /* Task in the target is not done. */ - *response_ptr = SAS_TASK_UNDELIVERED; + if (request->io_tag == SCI_CONTROLLER_INVALID_IO_TAG) { + request->io_tag = + scic_controller_allocate_io_tag(request->owning_controller); + } - if ((isci_device->status == isci_stopping) || - (isci_device->status == isci_stopped)) - *status_ptr = SAS_DEVICE_UNKNOWN; - else - *status_ptr = SAM_STAT_TASK_ABORTED; + /* Record the IO Tag in the request */ + if (request->io_tag != SCI_CONTROLLER_INVALID_IO_TAG) { + task_context = request->task_context_buffer; - request->complete_in_target = false; + task_context->task_index = scic_sds_io_tag_get_index(request->io_tag); - *complete_to_host_ptr = - isci_perform_error_io_completion; - } + switch (task_context->protocol_type) { + case SCU_TASK_CONTEXT_PROTOCOL_SMP: + case SCU_TASK_CONTEXT_PROTOCOL_SSP: + /* SSP/SMP Frame */ + task_context->type.ssp.tag = request->io_tag; + task_context->type.ssp.target_port_transfer_tag = 0xFFFF; + break; - break; + case SCU_TASK_CONTEXT_PROTOCOL_STP: + /* + * STP/SATA Frame + * task_context->type.stp.ncq_tag = request->ncq_tag; */ + break; - case SCU_TASK_DONE_CRC_ERR: - case SCU_TASK_DONE_NAK_CMD_ERR: - case SCU_TASK_DONE_EXCESS_DATA: - case SCU_TASK_DONE_UNEXP_FIS: - /* Also SCU_TASK_DONE_UNEXP_RESP: */ - case SCU_TASK_DONE_VIIT_ENTRY_NV: /* TODO - conditions? */ - case SCU_TASK_DONE_IIT_ENTRY_NV: /* TODO - conditions? */ - case SCU_TASK_DONE_RNCNV_OUTBOUND: /* TODO - conditions? */ - /* These are conditions in which the target - * has completed the task, so that no cleanup - * is necessary. - */ - *response_ptr = SAS_TASK_COMPLETE; + case SCU_TASK_CONTEXT_PROTOCOL_NONE: + /* / @todo When do we set no protocol type? */ + break; - /* See if the device has been/is being stopped. Note - * that we ignore the quiesce state, since we are - * concerned about the actual device state. - */ - if ((isci_device->status == isci_stopping) || - (isci_device->status == isci_stopped)) - *status_ptr = SAS_DEVICE_UNKNOWN; - else - *status_ptr = SAS_ABORTED_TASK; + default: + /* This should never happen since we build the IO requests */ + break; + } - request->complete_in_target = true; + /* + * Check to see if we need to copy the task context buffer + * or have been building into the task context buffer */ + if (request->was_tag_assigned_by_user == false) { + scic_sds_controller_copy_task_context( + request->owning_controller, request); + } - *complete_to_host_ptr = isci_perform_normal_io_completion; - break; + /* Add to the post_context the io tag value */ + request->post_context |= scic_sds_io_tag_get_index(request->io_tag); + /* Everything is good go ahead and change state */ + sci_base_state_machine_change_state(&request->state_machine, + SCI_BASE_REQUEST_STATE_STARTED); - /* Note that the only open reject completion codes seen here will be - * abandon-class codes; all others are automatically retried in the SCU. - */ - case SCU_TASK_OPEN_REJECT_WRONG_DESTINATION: + return SCI_SUCCESS; + } - isci_request_set_open_reject_status( - request, task, response_ptr, status_ptr, - complete_to_host_ptr, SAS_OREJ_WRONG_DEST); - break; + return SCI_FAILURE_INSUFFICIENT_RESOURCES; +} - case SCU_TASK_OPEN_REJECT_ZONE_VIOLATION: +/* + * This method implements the action to be taken when an SCIC_SDS_IO_REQUEST_T + * object receives a scic_sds_request_terminate() request. Since the request + * has not yet been posted to the hardware the request transitions to the + * completed state. enum sci_status SCI_SUCCESS + */ +static enum sci_status scic_sds_request_constructed_state_abort_handler( + struct scic_sds_request *request) +{ + /* + * This request has been terminated by the user make sure that the correct + * status code is returned */ + scic_sds_request_set_status(request, + SCU_TASK_DONE_TASK_ABORT, + SCI_FAILURE_IO_TERMINATED); + + sci_base_state_machine_change_state(&request->state_machine, + SCI_BASE_REQUEST_STATE_COMPLETED); + return SCI_SUCCESS; +} - /* Note - the return of AB0 will change when - * libsas implements detection of zone violations. - */ - isci_request_set_open_reject_status( - request, task, response_ptr, status_ptr, - complete_to_host_ptr, SAS_OREJ_RESV_AB0); - break; +/* + * ***************************************************************************** + * * STARTED STATE HANDLERS + * ***************************************************************************** */ - case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_1: +/* + * This method implements the action to be taken when an SCIC_SDS_IO_REQUEST_T + * object receives a scic_sds_request_terminate() request. Since the request + * has been posted to the hardware the io request state is changed to the + * aborting state. enum sci_status SCI_SUCCESS + */ +enum sci_status scic_sds_request_started_state_abort_handler( + struct scic_sds_request *request) +{ + if (request->has_started_substate_machine) + sci_base_state_machine_stop(&request->started_substate_machine); - isci_request_set_open_reject_status( - request, task, response_ptr, status_ptr, - complete_to_host_ptr, SAS_OREJ_RESV_AB1); - break; + sci_base_state_machine_change_state(&request->state_machine, + SCI_BASE_REQUEST_STATE_ABORTING); + return SCI_SUCCESS; +} - case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_2: +/* + * scic_sds_request_started_state_tc_completion_handler() - This method process + * TC (task context) completions for normal IO request (i.e. Task/Abort + * Completions of type 0). This method will update the + * SCIC_SDS_IO_REQUEST_T::status field. + * @sci_req: This parameter specifies the request for which a completion + * occurred. + * @completion_code: This parameter specifies the completion code received from + * the SCU. + * + */ +static enum sci_status +scic_sds_request_started_state_tc_completion_handler(struct scic_sds_request *sci_req, + u32 completion_code) +{ + u8 datapres; + struct ssp_response_iu *resp_iu; - isci_request_set_open_reject_status( - request, task, response_ptr, status_ptr, - complete_to_host_ptr, SAS_OREJ_RESV_AB2); + /* + * TODO: Any SDMA return code of other than 0 is bad + * decode 0x003C0000 to determine SDMA status + */ + switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) { + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD): + scic_sds_request_set_status(sci_req, + SCU_TASK_DONE_GOOD, + SCI_SUCCESS); break; - case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_3: + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_EARLY_RESP): + { + /* + * There are times when the SCU hardware will return an early + * response because the io request specified more data than is + * returned by the target device (mode pages, inquiry data, + * etc.). We must check the response stats to see if this is + * truly a failed request or a good request that just got + * completed early. + */ + struct ssp_response_iu *resp = &sci_req->ssp.rsp; + ssize_t word_cnt = SSP_RESP_IU_MAX_SIZE / sizeof(u32); + + sci_swab32_cpy(&sci_req->ssp.rsp, + &sci_req->ssp.rsp, + word_cnt); + + if (resp->status == 0) { + scic_sds_request_set_status( + sci_req, + SCU_TASK_DONE_GOOD, + SCI_SUCCESS_IO_DONE_EARLY); + } else { + scic_sds_request_set_status( + sci_req, + SCU_TASK_DONE_CHECK_RESPONSE, + SCI_FAILURE_IO_RESPONSE_VALID); + } + } + break; - isci_request_set_open_reject_status( - request, task, response_ptr, status_ptr, - complete_to_host_ptr, SAS_OREJ_RESV_AB3); - break; + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_CHECK_RESPONSE): + { + ssize_t word_cnt = SSP_RESP_IU_MAX_SIZE / sizeof(u32); - case SCU_TASK_OPEN_REJECT_BAD_DESTINATION: + sci_swab32_cpy(&sci_req->ssp.rsp, + &sci_req->ssp.rsp, + word_cnt); - isci_request_set_open_reject_status( - request, task, response_ptr, status_ptr, - complete_to_host_ptr, SAS_OREJ_BAD_DEST); + scic_sds_request_set_status(sci_req, + SCU_TASK_DONE_CHECK_RESPONSE, + SCI_FAILURE_IO_RESPONSE_VALID); break; + } - case SCU_TASK_OPEN_REJECT_STP_RESOURCES_BUSY: - - isci_request_set_open_reject_status( - request, task, response_ptr, status_ptr, - complete_to_host_ptr, SAS_OREJ_STP_NORES); + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_RESP_LEN_ERR): + /* + * / @todo With TASK_DONE_RESP_LEN_ERR is the response frame + * guaranteed to be received before this completion status is + * posted? + */ + resp_iu = &sci_req->ssp.rsp; + datapres = resp_iu->datapres; + + if ((datapres == 0x01) || (datapres == 0x02)) { + scic_sds_request_set_status( + sci_req, + SCU_TASK_DONE_CHECK_RESPONSE, + SCI_FAILURE_IO_RESPONSE_VALID); + } else + scic_sds_request_set_status( + sci_req, SCU_TASK_DONE_GOOD, SCI_SUCCESS); break; - case SCU_TASK_OPEN_REJECT_PROTOCOL_NOT_SUPPORTED: - - isci_request_set_open_reject_status( - request, task, response_ptr, status_ptr, - complete_to_host_ptr, SAS_OREJ_EPROTO); + /* only stp device gets suspended. */ + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_ACK_NAK_TO): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LL_PERR): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_NAK_ERR): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_DATA_LEN_ERR): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LL_ABORT_ERR): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_XR_WD_LEN): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_MAX_PLD_ERR): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_RESP): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_SDBFIS): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_REG_ERR): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SDB_ERR): + if (sci_req->protocol == SCIC_STP_PROTOCOL) { + scic_sds_request_set_status( + sci_req, + SCU_GET_COMPLETION_TL_STATUS(completion_code) >> + SCU_COMPLETION_TL_STATUS_SHIFT, + SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED); + } else { + scic_sds_request_set_status( + sci_req, + SCU_GET_COMPLETION_TL_STATUS(completion_code) >> + SCU_COMPLETION_TL_STATUS_SHIFT, + SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR); + } break; - case SCU_TASK_OPEN_REJECT_CONNECTION_RATE_NOT_SUPPORTED: - - isci_request_set_open_reject_status( - request, task, response_ptr, status_ptr, - complete_to_host_ptr, SAS_OREJ_CONN_RATE); + /* both stp/ssp device gets suspended */ + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LF_ERR): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_WRONG_DESTINATION): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_1): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_2): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_3): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_BAD_DESTINATION): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_ZONE_VIOLATION): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_STP_RESOURCES_BUSY): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_PROTOCOL_NOT_SUPPORTED): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_CONNECTION_RATE_NOT_SUPPORTED): + scic_sds_request_set_status( + sci_req, + SCU_GET_COMPLETION_TL_STATUS(completion_code) >> + SCU_COMPLETION_TL_STATUS_SHIFT, + SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED); break; - case SCU_TASK_DONE_LL_R_ERR: - /* Also SCU_TASK_DONE_ACK_NAK_TO: */ - case SCU_TASK_DONE_LL_PERR: - case SCU_TASK_DONE_LL_SY_TERM: - /* Also SCU_TASK_DONE_NAK_ERR:*/ - case SCU_TASK_DONE_LL_LF_TERM: - /* Also SCU_TASK_DONE_DATA_LEN_ERR: */ - case SCU_TASK_DONE_LL_ABORT_ERR: - case SCU_TASK_DONE_SEQ_INV_TYPE: - /* Also SCU_TASK_DONE_UNEXP_XR: */ - case SCU_TASK_DONE_XR_IU_LEN_ERR: - case SCU_TASK_DONE_INV_FIS_LEN: - /* Also SCU_TASK_DONE_XR_WD_LEN: */ - case SCU_TASK_DONE_SDMA_ERR: - case SCU_TASK_DONE_OFFSET_ERR: - case SCU_TASK_DONE_MAX_PLD_ERR: - case SCU_TASK_DONE_LF_ERR: - case SCU_TASK_DONE_SMP_RESP_TO_ERR: /* Escalate to dev reset? */ - case SCU_TASK_DONE_SMP_LL_RX_ERR: - case SCU_TASK_DONE_UNEXP_DATA: - case SCU_TASK_DONE_UNEXP_SDBFIS: - case SCU_TASK_DONE_REG_ERR: - case SCU_TASK_DONE_SDB_ERR: - case SCU_TASK_DONE_TASK_ABORT: + /* neither ssp nor stp gets suspended. */ + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_NAK_CMD_ERR): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_XR): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_XR_IU_LEN_ERR): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SDMA_ERR): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_OFFSET_ERR): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_EXCESS_DATA): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_RESP_TO_ERR): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_UFI_ERR): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_FRM_TYPE_ERR): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_LL_RX_ERR): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_DATA): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_OPEN_FAIL): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_VIIT_ENTRY_NV): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_IIT_ENTRY_NV): + case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_RNCNV_OUTBOUND): default: - /* Task in the target is not done. */ - *response_ptr = SAS_TASK_UNDELIVERED; - *status_ptr = SAM_STAT_TASK_ABORTED; - request->complete_in_target = false; - - *complete_to_host_ptr = isci_perform_error_io_completion; + scic_sds_request_set_status( + sci_req, + SCU_GET_COMPLETION_TL_STATUS(completion_code) >> + SCU_COMPLETION_TL_STATUS_SHIFT, + SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR); break; } + + /* + * TODO: This is probably wrong for ACK/NAK timeout conditions + */ + + /* In all cases we will treat this as the completion of the IO req. */ + sci_base_state_machine_change_state( + &sci_req->state_machine, + SCI_BASE_REQUEST_STATE_COMPLETED); + return SCI_SUCCESS; } -/** - * isci_task_save_for_upper_layer_completion() - This function saves the - * request for later completion to the upper layer driver. - * @host: This parameter is a pointer to the host on which the the request - * should be queued (either as an error or success). - * @request: This parameter is the completed request. - * @response: This parameter is the response code for the completed task. - * @status: This parameter is the status code for the completed task. - * - * none. - */ -static void isci_task_save_for_upper_layer_completion( - struct isci_host *host, - struct isci_request *request, - enum service_response response, - enum exec_status status, - enum isci_completion_selection task_notification_selection) +enum sci_status +scic_sds_io_request_tc_completion(struct scic_sds_request *request, u32 completion_code) { - struct sas_task *task = isci_request_access_task(request); - - task_notification_selection - = isci_task_set_completion_status(task, response, status, - task_notification_selection); + if (request->state_machine.current_state_id == SCI_BASE_REQUEST_STATE_STARTED && + request->has_started_substate_machine == false) + return scic_sds_request_started_state_tc_completion_handler(request, completion_code); + else if (request->state_handlers->tc_completion_handler) + return request->state_handlers->tc_completion_handler(request, completion_code); + + dev_warn(scic_to_dev(request->owning_controller), + "%s: SCIC IO Request given task completion notification %x " + "while in wrong state %d\n", + __func__, + completion_code, + sci_base_state_machine_get_state(&request->state_machine)); - /* Tasks aborted specifically by a call to the lldd_abort_task - * function should not be completed to the host in the regular path. - */ - switch (task_notification_selection) { + return SCI_FAILURE_INVALID_STATE; - case isci_perform_normal_io_completion: +} - /* Normal notification (task_done) */ - dev_dbg(&host->pdev->dev, - "%s: Normal - task = %p, response=%d (%d), status=%d (%d)\n", +/* + * This method implements the action to be taken when an SCIC_SDS_IO_REQUEST_T + * object receives a scic_sds_request_frame_handler() request. This method + * first determines the frame type received. If this is a response frame then + * the response data is copied to the io request response buffer for processing + * at completion time. If the frame type is not a response buffer an error is + * logged. enum sci_status SCI_SUCCESS SCI_FAILURE_INVALID_PARAMETER_VALUE + */ +static enum sci_status +scic_sds_request_started_state_frame_handler(struct scic_sds_request *sci_req, + u32 frame_index) +{ + enum sci_status status; + u32 *frame_header; + struct ssp_frame_hdr ssp_hdr; + ssize_t word_cnt; + + status = scic_sds_unsolicited_frame_control_get_header( + &(scic_sds_request_get_controller(sci_req)->uf_control), + frame_index, + (void **)&frame_header); + + word_cnt = sizeof(struct ssp_frame_hdr) / sizeof(u32); + sci_swab32_cpy(&ssp_hdr, frame_header, word_cnt); + + if (ssp_hdr.frame_type == SSP_RESPONSE) { + struct ssp_response_iu *resp_iu; + ssize_t word_cnt = SSP_RESP_IU_MAX_SIZE / sizeof(u32); + + status = scic_sds_unsolicited_frame_control_get_buffer( + &(scic_sds_request_get_controller(sci_req)->uf_control), + frame_index, + (void **)&resp_iu); + + sci_swab32_cpy(&sci_req->ssp.rsp, + resp_iu, word_cnt); + + resp_iu = &sci_req->ssp.rsp; + + if ((resp_iu->datapres == 0x01) || + (resp_iu->datapres == 0x02)) { + scic_sds_request_set_status( + sci_req, + SCU_TASK_DONE_CHECK_RESPONSE, + SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR); + } else + scic_sds_request_set_status( + sci_req, SCU_TASK_DONE_GOOD, SCI_SUCCESS); + } else { + /* This was not a response frame why did it get forwarded? */ + dev_err(scic_to_dev(sci_req->owning_controller), + "%s: SCIC IO Request 0x%p received unexpected " + "frame %d type 0x%02x\n", __func__, - task, - task->task_status.resp, response, - task->task_status.stat, status); - /* Add to the completed list. */ - list_add(&request->completed_node, - &host->requests_to_complete); + sci_req, + frame_index, + ssp_hdr.frame_type); + } - /* Take the request off the device's pending request list. */ - list_del_init(&request->dev_node); - break; + /* + * In any case we are done with this frame buffer return it to the + * controller + */ + scic_sds_controller_release_frame( + sci_req->owning_controller, frame_index); - case isci_perform_aborted_io_completion: - /* No notification to libsas because this request is - * already in the abort path. - */ - dev_warn(&host->pdev->dev, - "%s: Aborted - task = %p, response=%d (%d), status=%d (%d)\n", - __func__, - task, - task->task_status.resp, response, - task->task_status.stat, status); + return SCI_SUCCESS; +} - /* Wake up whatever process was waiting for this - * request to complete. - */ - WARN_ON(request->io_request_completion == NULL); +/* + * ***************************************************************************** + * * COMPLETED STATE HANDLERS + * ***************************************************************************** */ - if (request->io_request_completion != NULL) { - /* Signal whoever is waiting that this - * request is complete. - */ - complete(request->io_request_completion); - } - break; +/* + * This method implements the action to be taken when an SCIC_SDS_IO_REQUEST_T + * object receives a scic_sds_request_complete() request. This method frees up + * any io request resources that have been allocated and transitions the + * request to its final state. Consider stopping the state machine instead of + * transitioning to the final state? enum sci_status SCI_SUCCESS + */ +static enum sci_status scic_sds_request_completed_state_complete_handler( + struct scic_sds_request *request) +{ + if (request->was_tag_assigned_by_user != true) { + scic_controller_free_io_tag( + request->owning_controller, request->io_tag); + } - case isci_perform_error_io_completion: - /* Use sas_task_abort */ - dev_warn(&host->pdev->dev, - "%s: Error - task = %p, response=%d (%d), status=%d (%d)\n", - __func__, - task, - task->task_status.resp, response, - task->task_status.stat, status); - /* Add to the aborted list. */ - list_add(&request->completed_node, - &host->requests_to_errorback); - break; + if (request->saved_rx_frame_index != SCU_INVALID_FRAME_INDEX) { + scic_sds_controller_release_frame( + request->owning_controller, request->saved_rx_frame_index); + } - default: - dev_warn(&host->pdev->dev, - "%s: Unknown - task = %p, response=%d (%d), status=%d (%d)\n", - __func__, - task, - task->task_status.resp, response, - task->task_status.stat, status); + sci_base_state_machine_change_state(&request->state_machine, + SCI_BASE_REQUEST_STATE_FINAL); + return SCI_SUCCESS; +} - /* Add to the error to libsas list. */ - list_add(&request->completed_node, - &host->requests_to_errorback); +/* + * ***************************************************************************** + * * ABORTING STATE HANDLERS + * ***************************************************************************** */ + +/* + * This method implements the action to be taken when an SCIC_SDS_IO_REQUEST_T + * object receives a scic_sds_request_terminate() request. This method is the + * io request aborting state abort handlers. On receipt of a multiple + * terminate requests the io request will transition to the completed state. + * This should not happen in normal operation. enum sci_status SCI_SUCCESS + */ +static enum sci_status scic_sds_request_aborting_state_abort_handler( + struct scic_sds_request *request) +{ + sci_base_state_machine_change_state(&request->state_machine, + SCI_BASE_REQUEST_STATE_COMPLETED); + return SCI_SUCCESS; +} + +/* + * This method implements the action to be taken when an SCIC_SDS_IO_REQUEST_T + * object receives a scic_sds_request_task_completion() request. This method + * decodes the completion type waiting for the abort task complete + * notification. When the abort task complete is received the io request + * transitions to the completed state. enum sci_status SCI_SUCCESS + */ +static enum sci_status scic_sds_request_aborting_state_tc_completion_handler( + struct scic_sds_request *sci_req, + u32 completion_code) +{ + switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) { + case (SCU_TASK_DONE_GOOD << SCU_COMPLETION_TL_STATUS_SHIFT): + case (SCU_TASK_DONE_TASK_ABORT << SCU_COMPLETION_TL_STATUS_SHIFT): + scic_sds_request_set_status( + sci_req, SCU_TASK_DONE_TASK_ABORT, SCI_FAILURE_IO_TERMINATED + ); + + sci_base_state_machine_change_state(&sci_req->state_machine, + SCI_BASE_REQUEST_STATE_COMPLETED); + break; + + default: + /* + * Unless we get some strange error wait for the task abort to complete + * TODO: Should there be a state change for this completion? */ break; } + + return SCI_SUCCESS; +} + +/* + * This method implements the action to be taken when an SCIC_SDS_IO_REQUEST_T + * object receives a scic_sds_request_frame_handler() request. This method + * discards the unsolicited frame since we are waiting for the abort task + * completion. enum sci_status SCI_SUCCESS + */ +static enum sci_status scic_sds_request_aborting_state_frame_handler( + struct scic_sds_request *sci_req, + u32 frame_index) +{ + /* TODO: Is it even possible to get an unsolicited frame in the aborting state? */ + + scic_sds_controller_release_frame( + sci_req->owning_controller, frame_index); + + return SCI_SUCCESS; } +static const struct scic_sds_io_request_state_handler scic_sds_request_state_handler_table[] = { + [SCI_BASE_REQUEST_STATE_INITIAL] = { + }, + [SCI_BASE_REQUEST_STATE_CONSTRUCTED] = { + .start_handler = scic_sds_request_constructed_state_start_handler, + .abort_handler = scic_sds_request_constructed_state_abort_handler, + }, + [SCI_BASE_REQUEST_STATE_STARTED] = { + .abort_handler = scic_sds_request_started_state_abort_handler, + .tc_completion_handler = scic_sds_request_started_state_tc_completion_handler, + .frame_handler = scic_sds_request_started_state_frame_handler, + }, + [SCI_BASE_REQUEST_STATE_COMPLETED] = { + .complete_handler = scic_sds_request_completed_state_complete_handler, + }, + [SCI_BASE_REQUEST_STATE_ABORTING] = { + .abort_handler = scic_sds_request_aborting_state_abort_handler, + .tc_completion_handler = scic_sds_request_aborting_state_tc_completion_handler, + .frame_handler = scic_sds_request_aborting_state_frame_handler, + }, + [SCI_BASE_REQUEST_STATE_FINAL] = { + }, +}; + + /** - * isci_request_io_request_complete() - This function is called by the sci core - * when an io request completes. - * @isci_host: This parameter specifies the ISCI host object - * @request: This parameter is the completed isci_request object. - * @completion_status: This parameter specifies the completion status from the - * sci core. + * isci_request_process_response_iu() - This function sets the status and + * response iu, in the task struct, from the request object for the upper + * layer driver. + * @sas_task: This parameter is the task struct from the upper layer driver. + * @resp_iu: This parameter points to the response iu of the completed request. + * @dev: This parameter specifies the linux device struct. * * none. */ -void isci_request_io_request_complete( - struct isci_host *isci_host, - struct isci_request *request, - enum sci_io_status completion_status) +static void isci_request_process_response_iu( + struct sas_task *task, + struct ssp_response_iu *resp_iu, + struct device *dev) { - struct sas_task *task = isci_request_access_task(request); - struct ssp_response_iu *resp_iu; - void *resp_buf; - unsigned long task_flags; - struct isci_remote_device *isci_device = request->isci_device; - enum service_response response = SAS_TASK_UNDELIVERED; - enum exec_status status = SAS_ABORTED_TASK; - enum isci_request_status request_status; - enum isci_completion_selection complete_to_host - = isci_perform_normal_io_completion; - - dev_dbg(&isci_host->pdev->dev, - "%s: request = %p, task = %p,\n" - "task->data_dir = %d completion_status = 0x%x\n", + dev_dbg(dev, + "%s: resp_iu = %p " + "resp_iu->status = 0x%x,\nresp_iu->datapres = %d " + "resp_iu->response_data_len = %x, " + "resp_iu->sense_data_len = %x\nrepsonse data: ", __func__, - request, - task, - task->data_dir, - completion_status); + resp_iu, + resp_iu->status, + resp_iu->datapres, + resp_iu->response_data_len, + resp_iu->sense_data_len); - spin_lock(&request->state_lock); - request_status = isci_request_get_state(request); + task->task_status.stat = resp_iu->status; - /* Decode the request status. Note that if the request has been - * aborted by a task management function, we don't care - * what the status is. - */ - switch (request_status) { + /* libsas updates the task status fields based on the response iu. */ + sas_ssp_task_response(dev, task, resp_iu); +} - case aborted: - /* "aborted" indicates that the request was aborted by a task - * management function, since once a task management request is - * perfomed by the device, the request only completes because - * of the subsequent driver terminate. - * - * Aborted also means an external thread is explicitly managing - * this request, so that we do not complete it up the stack. - * - * The target is still there (since the TMF was successful). - */ - request->complete_in_target = true; - response = SAS_TASK_COMPLETE; +/** + * isci_request_set_open_reject_status() - This function prepares the I/O + * completion for OPEN_REJECT conditions. + * @request: This parameter is the completed isci_request object. + * @response_ptr: This parameter specifies the service response for the I/O. + * @status_ptr: This parameter specifies the exec status for the I/O. + * @complete_to_host_ptr: This parameter specifies the action to be taken by + * the LLDD with respect to completing this request or forcing an abort + * condition on the I/O. + * @open_rej_reason: This parameter specifies the encoded reason for the + * abandon-class reject. + * + * none. + */ +static void isci_request_set_open_reject_status( + struct isci_request *request, + struct sas_task *task, + enum service_response *response_ptr, + enum exec_status *status_ptr, + enum isci_completion_selection *complete_to_host_ptr, + enum sas_open_rej_reason open_rej_reason) +{ + /* Task in the target is done. */ + request->complete_in_target = true; + *response_ptr = SAS_TASK_UNDELIVERED; + *status_ptr = SAS_OPEN_REJECT; + *complete_to_host_ptr = isci_perform_normal_io_completion; + task->task_status.open_rej_reason = open_rej_reason; +} - /* See if the device has been/is being stopped. Note - * that we ignore the quiesce state, since we are - * concerned about the actual device state. - */ - if ((isci_device->status == isci_stopping) - || (isci_device->status == isci_stopped) - ) - status = SAS_DEVICE_UNKNOWN; - else - status = SAS_ABORTED_TASK; +/** + * isci_request_handle_controller_specific_errors() - This function decodes + * controller-specific I/O completion error conditions. + * @request: This parameter is the completed isci_request object. + * @response_ptr: This parameter specifies the service response for the I/O. + * @status_ptr: This parameter specifies the exec status for the I/O. + * @complete_to_host_ptr: This parameter specifies the action to be taken by + * the LLDD with respect to completing this request or forcing an abort + * condition on the I/O. + * + * none. + */ +static void isci_request_handle_controller_specific_errors( + struct isci_remote_device *isci_device, + struct isci_request *request, + struct sas_task *task, + enum service_response *response_ptr, + enum exec_status *status_ptr, + enum isci_completion_selection *complete_to_host_ptr) +{ + unsigned int cstatus; - complete_to_host = isci_perform_aborted_io_completion; - /* This was an aborted request. */ + cstatus = request->sci.scu_status; - spin_unlock(&request->state_lock); - break; + dev_dbg(&request->isci_host->pdev->dev, + "%s: %p SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR " + "- controller status = 0x%x\n", + __func__, request, cstatus); - case aborting: - /* aborting means that the task management function tried and - * failed to abort the request. We need to note the request - * as SAS_TASK_UNDELIVERED, so that the scsi mid layer marks the - * target as down. - * - * Aborting also means an external thread is explicitly managing - * this request, so that we do not complete it up the stack. - */ - request->complete_in_target = true; - response = SAS_TASK_UNDELIVERED; + /* Decode the controller-specific errors; most + * important is to recognize those conditions in which + * the target may still have a task outstanding that + * must be aborted. + * + * Note that there are SCU completion codes being + * named in the decode below for which SCIC has already + * done work to handle them in a way other than as + * a controller-specific completion code; these are left + * in the decode below for completeness sake. + */ + switch (cstatus) { + case SCU_TASK_DONE_DMASETUP_DIRERR: + /* Also SCU_TASK_DONE_SMP_FRM_TYPE_ERR: */ + case SCU_TASK_DONE_XFERCNT_ERR: + /* Also SCU_TASK_DONE_SMP_UFI_ERR: */ + if (task->task_proto == SAS_PROTOCOL_SMP) { + /* SCU_TASK_DONE_SMP_UFI_ERR == Task Done. */ + *response_ptr = SAS_TASK_COMPLETE; - if ((isci_device->status == isci_stopping) || - (isci_device->status == isci_stopped)) - /* The device has been /is being stopped. Note that - * we ignore the quiesce state, since we are + /* See if the device has been/is being stopped. Note + * that we ignore the quiesce state, since we are * concerned about the actual device state. */ - status = SAS_DEVICE_UNKNOWN; - else - status = SAS_PHY_DOWN; + if ((isci_device->status == isci_stopping) || + (isci_device->status == isci_stopped)) + *status_ptr = SAS_DEVICE_UNKNOWN; + else + *status_ptr = SAS_ABORTED_TASK; - complete_to_host = isci_perform_aborted_io_completion; + request->complete_in_target = true; - /* This was an aborted request. */ + *complete_to_host_ptr = + isci_perform_normal_io_completion; + } else { + /* Task in the target is not done. */ + *response_ptr = SAS_TASK_UNDELIVERED; - spin_unlock(&request->state_lock); - break; + if ((isci_device->status == isci_stopping) || + (isci_device->status == isci_stopped)) + *status_ptr = SAS_DEVICE_UNKNOWN; + else + *status_ptr = SAM_STAT_TASK_ABORTED; - case terminating: + request->complete_in_target = false; - /* This was an terminated request. This happens when - * the I/O is being terminated because of an action on - * the device (reset, tear down, etc.), and the I/O needs - * to be completed up the stack. + *complete_to_host_ptr = + isci_perform_error_io_completion; + } + + break; + + case SCU_TASK_DONE_CRC_ERR: + case SCU_TASK_DONE_NAK_CMD_ERR: + case SCU_TASK_DONE_EXCESS_DATA: + case SCU_TASK_DONE_UNEXP_FIS: + /* Also SCU_TASK_DONE_UNEXP_RESP: */ + case SCU_TASK_DONE_VIIT_ENTRY_NV: /* TODO - conditions? */ + case SCU_TASK_DONE_IIT_ENTRY_NV: /* TODO - conditions? */ + case SCU_TASK_DONE_RNCNV_OUTBOUND: /* TODO - conditions? */ + /* These are conditions in which the target + * has completed the task, so that no cleanup + * is necessary. */ - request->complete_in_target = true; - response = SAS_TASK_UNDELIVERED; + *response_ptr = SAS_TASK_COMPLETE; /* See if the device has been/is being stopped. Note * that we ignore the quiesce state, since we are @@ -953,208 +1341,1206 @@ void isci_request_io_request_complete( */ if ((isci_device->status == isci_stopping) || (isci_device->status == isci_stopped)) - status = SAS_DEVICE_UNKNOWN; + *status_ptr = SAS_DEVICE_UNKNOWN; else - status = SAS_ABORTED_TASK; - - complete_to_host = isci_perform_aborted_io_completion; + *status_ptr = SAS_ABORTED_TASK; - /* This was a terminated request. */ + request->complete_in_target = true; - spin_unlock(&request->state_lock); + *complete_to_host_ptr = isci_perform_normal_io_completion; break; - default: - /* The request is done from an SCU HW perspective. */ - request->status = completed; + /* Note that the only open reject completion codes seen here will be + * abandon-class codes; all others are automatically retried in the SCU. + */ + case SCU_TASK_OPEN_REJECT_WRONG_DESTINATION: - spin_unlock(&request->state_lock); + isci_request_set_open_reject_status( + request, task, response_ptr, status_ptr, + complete_to_host_ptr, SAS_OREJ_WRONG_DEST); + break; - /* This is an active request being completed from the core. */ - switch (completion_status) { + case SCU_TASK_OPEN_REJECT_ZONE_VIOLATION: - case SCI_IO_FAILURE_RESPONSE_VALID: - dev_dbg(&isci_host->pdev->dev, - "%s: SCI_IO_FAILURE_RESPONSE_VALID (%p/%p)\n", - __func__, - request, - task); + /* Note - the return of AB0 will change when + * libsas implements detection of zone violations. + */ + isci_request_set_open_reject_status( + request, task, response_ptr, status_ptr, + complete_to_host_ptr, SAS_OREJ_RESV_AB0); + break; - if (sas_protocol_ata(task->task_proto)) { - resp_buf = &request->sci.stp.rsp; - isci_request_process_stp_response(task, - resp_buf); - } else if (SAS_PROTOCOL_SSP == task->task_proto) { + case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_1: - /* crack the iu response buffer. */ - resp_iu = &request->sci.ssp.rsp; - isci_request_process_response_iu(task, resp_iu, - &isci_host->pdev->dev); + isci_request_set_open_reject_status( + request, task, response_ptr, status_ptr, + complete_to_host_ptr, SAS_OREJ_RESV_AB1); + break; - } else if (SAS_PROTOCOL_SMP == task->task_proto) { + case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_2: - dev_err(&isci_host->pdev->dev, - "%s: SCI_IO_FAILURE_RESPONSE_VALID: " - "SAS_PROTOCOL_SMP protocol\n", - __func__); + isci_request_set_open_reject_status( + request, task, response_ptr, status_ptr, + complete_to_host_ptr, SAS_OREJ_RESV_AB2); + break; - } else - dev_err(&isci_host->pdev->dev, - "%s: unknown protocol\n", __func__); + case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_3: - /* use the task status set in the task struct by the - * isci_request_process_response_iu call. - */ - request->complete_in_target = true; - response = task->task_status.resp; - status = task->task_status.stat; - break; + isci_request_set_open_reject_status( + request, task, response_ptr, status_ptr, + complete_to_host_ptr, SAS_OREJ_RESV_AB3); + break; - case SCI_IO_SUCCESS: - case SCI_IO_SUCCESS_IO_DONE_EARLY: + case SCU_TASK_OPEN_REJECT_BAD_DESTINATION: - response = SAS_TASK_COMPLETE; - status = SAM_STAT_GOOD; - request->complete_in_target = true; + isci_request_set_open_reject_status( + request, task, response_ptr, status_ptr, + complete_to_host_ptr, SAS_OREJ_BAD_DEST); + break; - if (task->task_proto == SAS_PROTOCOL_SMP) { - void *rsp = &request->sci.smp.rsp; + case SCU_TASK_OPEN_REJECT_STP_RESOURCES_BUSY: - dev_dbg(&isci_host->pdev->dev, - "%s: SMP protocol completion\n", - __func__); + isci_request_set_open_reject_status( + request, task, response_ptr, status_ptr, + complete_to_host_ptr, SAS_OREJ_STP_NORES); + break; - sg_copy_from_buffer( - &task->smp_task.smp_resp, 1, - rsp, sizeof(struct smp_resp)); - } else if (completion_status - == SCI_IO_SUCCESS_IO_DONE_EARLY) { + case SCU_TASK_OPEN_REJECT_PROTOCOL_NOT_SUPPORTED: - /* This was an SSP / STP / SATA transfer. - * There is a possibility that less data than - * the maximum was transferred. - */ - u32 transferred_length - = scic_io_request_get_number_of_bytes_transferred(&request->sci); + isci_request_set_open_reject_status( + request, task, response_ptr, status_ptr, + complete_to_host_ptr, SAS_OREJ_EPROTO); + break; - task->task_status.residual - = task->total_xfer_len - transferred_length; + case SCU_TASK_OPEN_REJECT_CONNECTION_RATE_NOT_SUPPORTED: - /* If there were residual bytes, call this an - * underrun. - */ - if (task->task_status.residual != 0) - status = SAS_DATA_UNDERRUN; + isci_request_set_open_reject_status( + request, task, response_ptr, status_ptr, + complete_to_host_ptr, SAS_OREJ_CONN_RATE); + break; - dev_dbg(&isci_host->pdev->dev, - "%s: SCI_IO_SUCCESS_IO_DONE_EARLY %d\n", - __func__, - status); + case SCU_TASK_DONE_LL_R_ERR: + /* Also SCU_TASK_DONE_ACK_NAK_TO: */ + case SCU_TASK_DONE_LL_PERR: + case SCU_TASK_DONE_LL_SY_TERM: + /* Also SCU_TASK_DONE_NAK_ERR:*/ + case SCU_TASK_DONE_LL_LF_TERM: + /* Also SCU_TASK_DONE_DATA_LEN_ERR: */ + case SCU_TASK_DONE_LL_ABORT_ERR: + case SCU_TASK_DONE_SEQ_INV_TYPE: + /* Also SCU_TASK_DONE_UNEXP_XR: */ + case SCU_TASK_DONE_XR_IU_LEN_ERR: + case SCU_TASK_DONE_INV_FIS_LEN: + /* Also SCU_TASK_DONE_XR_WD_LEN: */ + case SCU_TASK_DONE_SDMA_ERR: + case SCU_TASK_DONE_OFFSET_ERR: + case SCU_TASK_DONE_MAX_PLD_ERR: + case SCU_TASK_DONE_LF_ERR: + case SCU_TASK_DONE_SMP_RESP_TO_ERR: /* Escalate to dev reset? */ + case SCU_TASK_DONE_SMP_LL_RX_ERR: + case SCU_TASK_DONE_UNEXP_DATA: + case SCU_TASK_DONE_UNEXP_SDBFIS: + case SCU_TASK_DONE_REG_ERR: + case SCU_TASK_DONE_SDB_ERR: + case SCU_TASK_DONE_TASK_ABORT: + default: + /* Task in the target is not done. */ + *response_ptr = SAS_TASK_UNDELIVERED; + *status_ptr = SAM_STAT_TASK_ABORTED; + request->complete_in_target = false; - } else - dev_dbg(&isci_host->pdev->dev, - "%s: SCI_IO_SUCCESS\n", - __func__); + *complete_to_host_ptr = isci_perform_error_io_completion; + break; + } +} - break; +/** + * isci_task_save_for_upper_layer_completion() - This function saves the + * request for later completion to the upper layer driver. + * @host: This parameter is a pointer to the host on which the the request + * should be queued (either as an error or success). + * @request: This parameter is the completed request. + * @response: This parameter is the response code for the completed task. + * @status: This parameter is the status code for the completed task. + * + * none. + */ +static void isci_task_save_for_upper_layer_completion( + struct isci_host *host, + struct isci_request *request, + enum service_response response, + enum exec_status status, + enum isci_completion_selection task_notification_selection) +{ + struct sas_task *task = isci_request_access_task(request); - case SCI_IO_FAILURE_TERMINATED: - dev_dbg(&isci_host->pdev->dev, - "%s: SCI_IO_FAILURE_TERMINATED (%p/%p)\n", - __func__, - request, - task); + task_notification_selection + = isci_task_set_completion_status(task, response, status, + task_notification_selection); - /* The request was terminated explicitly. No handling - * is needed in the SCSI error handler path. - */ - request->complete_in_target = true; - response = SAS_TASK_UNDELIVERED; + /* Tasks aborted specifically by a call to the lldd_abort_task + * function should not be completed to the host in the regular path. + */ + switch (task_notification_selection) { - /* See if the device has been/is being stopped. Note - * that we ignore the quiesce state, since we are - * concerned about the actual device state. - */ - if ((isci_device->status == isci_stopping) || - (isci_device->status == isci_stopped)) - status = SAS_DEVICE_UNKNOWN; - else - status = SAS_ABORTED_TASK; + case isci_perform_normal_io_completion: - complete_to_host = isci_perform_normal_io_completion; - break; + /* Normal notification (task_done) */ + dev_dbg(&host->pdev->dev, + "%s: Normal - task = %p, response=%d (%d), status=%d (%d)\n", + __func__, + task, + task->task_status.resp, response, + task->task_status.stat, status); + /* Add to the completed list. */ + list_add(&request->completed_node, + &host->requests_to_complete); - case SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR: + /* Take the request off the device's pending request list. */ + list_del_init(&request->dev_node); + break; - isci_request_handle_controller_specific_errors( - isci_device, request, task, &response, &status, - &complete_to_host); + case isci_perform_aborted_io_completion: + /* No notification to libsas because this request is + * already in the abort path. + */ + dev_warn(&host->pdev->dev, + "%s: Aborted - task = %p, response=%d (%d), status=%d (%d)\n", + __func__, + task, + task->task_status.resp, response, + task->task_status.stat, status); - break; + /* Wake up whatever process was waiting for this + * request to complete. + */ + WARN_ON(request->io_request_completion == NULL); - case SCI_IO_FAILURE_REMOTE_DEVICE_RESET_REQUIRED: - /* This is a special case, in that the I/O completion - * is telling us that the device needs a reset. - * In order for the device reset condition to be - * noticed, the I/O has to be handled in the error - * handler. Set the reset flag and cause the - * SCSI error thread to be scheduled. - */ - spin_lock_irqsave(&task->task_state_lock, task_flags); - task->task_state_flags |= SAS_TASK_NEED_DEV_RESET; + if (request->io_request_completion != NULL) { + + /* Signal whoever is waiting that this + * request is complete. + */ + complete(request->io_request_completion); + } + break; + + case isci_perform_error_io_completion: + /* Use sas_task_abort */ + dev_warn(&host->pdev->dev, + "%s: Error - task = %p, response=%d (%d), status=%d (%d)\n", + __func__, + task, + task->task_status.resp, response, + task->task_status.stat, status); + /* Add to the aborted list. */ + list_add(&request->completed_node, + &host->requests_to_errorback); + break; + + default: + dev_warn(&host->pdev->dev, + "%s: Unknown - task = %p, response=%d (%d), status=%d (%d)\n", + __func__, + task, + task->task_status.resp, response, + task->task_status.stat, status); + + /* Add to the error to libsas list. */ + list_add(&request->completed_node, + &host->requests_to_errorback); + break; + } +} + +static void isci_request_io_request_complete(struct isci_host *isci_host, + struct isci_request *request, + enum sci_io_status completion_status) +{ + struct sas_task *task = isci_request_access_task(request); + struct ssp_response_iu *resp_iu; + void *resp_buf; + unsigned long task_flags; + struct isci_remote_device *isci_device = request->isci_device; + enum service_response response = SAS_TASK_UNDELIVERED; + enum exec_status status = SAS_ABORTED_TASK; + enum isci_request_status request_status; + enum isci_completion_selection complete_to_host + = isci_perform_normal_io_completion; + + dev_dbg(&isci_host->pdev->dev, + "%s: request = %p, task = %p,\n" + "task->data_dir = %d completion_status = 0x%x\n", + __func__, + request, + task, + task->data_dir, + completion_status); + + spin_lock(&request->state_lock); + request_status = isci_request_get_state(request); + + /* Decode the request status. Note that if the request has been + * aborted by a task management function, we don't care + * what the status is. + */ + switch (request_status) { + + case aborted: + /* "aborted" indicates that the request was aborted by a task + * management function, since once a task management request is + * perfomed by the device, the request only completes because + * of the subsequent driver terminate. + * + * Aborted also means an external thread is explicitly managing + * this request, so that we do not complete it up the stack. + * + * The target is still there (since the TMF was successful). + */ + request->complete_in_target = true; + response = SAS_TASK_COMPLETE; + + /* See if the device has been/is being stopped. Note + * that we ignore the quiesce state, since we are + * concerned about the actual device state. + */ + if ((isci_device->status == isci_stopping) + || (isci_device->status == isci_stopped) + ) + status = SAS_DEVICE_UNKNOWN; + else + status = SAS_ABORTED_TASK; + + complete_to_host = isci_perform_aborted_io_completion; + /* This was an aborted request. */ + + spin_unlock(&request->state_lock); + break; + + case aborting: + /* aborting means that the task management function tried and + * failed to abort the request. We need to note the request + * as SAS_TASK_UNDELIVERED, so that the scsi mid layer marks the + * target as down. + * + * Aborting also means an external thread is explicitly managing + * this request, so that we do not complete it up the stack. + */ + request->complete_in_target = true; + response = SAS_TASK_UNDELIVERED; + + if ((isci_device->status == isci_stopping) || + (isci_device->status == isci_stopped)) + /* The device has been /is being stopped. Note that + * we ignore the quiesce state, since we are + * concerned about the actual device state. + */ + status = SAS_DEVICE_UNKNOWN; + else + status = SAS_PHY_DOWN; + + complete_to_host = isci_perform_aborted_io_completion; + + /* This was an aborted request. */ + + spin_unlock(&request->state_lock); + break; + + case terminating: + + /* This was an terminated request. This happens when + * the I/O is being terminated because of an action on + * the device (reset, tear down, etc.), and the I/O needs + * to be completed up the stack. + */ + request->complete_in_target = true; + response = SAS_TASK_UNDELIVERED; + + /* See if the device has been/is being stopped. Note + * that we ignore the quiesce state, since we are + * concerned about the actual device state. + */ + if ((isci_device->status == isci_stopping) || + (isci_device->status == isci_stopped)) + status = SAS_DEVICE_UNKNOWN; + else + status = SAS_ABORTED_TASK; + + complete_to_host = isci_perform_aborted_io_completion; + + /* This was a terminated request. */ + + spin_unlock(&request->state_lock); + break; + + default: + + /* The request is done from an SCU HW perspective. */ + request->status = completed; + + spin_unlock(&request->state_lock); + + /* This is an active request being completed from the core. */ + switch (completion_status) { + + case SCI_IO_FAILURE_RESPONSE_VALID: + dev_dbg(&isci_host->pdev->dev, + "%s: SCI_IO_FAILURE_RESPONSE_VALID (%p/%p)\n", + __func__, + request, + task); + + if (sas_protocol_ata(task->task_proto)) { + resp_buf = &request->sci.stp.rsp; + isci_request_process_stp_response(task, + resp_buf); + } else if (SAS_PROTOCOL_SSP == task->task_proto) { + + /* crack the iu response buffer. */ + resp_iu = &request->sci.ssp.rsp; + isci_request_process_response_iu(task, resp_iu, + &isci_host->pdev->dev); + + } else if (SAS_PROTOCOL_SMP == task->task_proto) { + + dev_err(&isci_host->pdev->dev, + "%s: SCI_IO_FAILURE_RESPONSE_VALID: " + "SAS_PROTOCOL_SMP protocol\n", + __func__); + + } else + dev_err(&isci_host->pdev->dev, + "%s: unknown protocol\n", __func__); + + /* use the task status set in the task struct by the + * isci_request_process_response_iu call. + */ + request->complete_in_target = true; + response = task->task_status.resp; + status = task->task_status.stat; + break; + + case SCI_IO_SUCCESS: + case SCI_IO_SUCCESS_IO_DONE_EARLY: + + response = SAS_TASK_COMPLETE; + status = SAM_STAT_GOOD; + request->complete_in_target = true; + + if (task->task_proto == SAS_PROTOCOL_SMP) { + void *rsp = &request->sci.smp.rsp; + + dev_dbg(&isci_host->pdev->dev, + "%s: SMP protocol completion\n", + __func__); + + sg_copy_from_buffer( + &task->smp_task.smp_resp, 1, + rsp, sizeof(struct smp_resp)); + } else if (completion_status + == SCI_IO_SUCCESS_IO_DONE_EARLY) { + + /* This was an SSP / STP / SATA transfer. + * There is a possibility that less data than + * the maximum was transferred. + */ + u32 transferred_length = sci_req_tx_bytes(&request->sci); + + task->task_status.residual + = task->total_xfer_len - transferred_length; + + /* If there were residual bytes, call this an + * underrun. + */ + if (task->task_status.residual != 0) + status = SAS_DATA_UNDERRUN; + + dev_dbg(&isci_host->pdev->dev, + "%s: SCI_IO_SUCCESS_IO_DONE_EARLY %d\n", + __func__, + status); + + } else + dev_dbg(&isci_host->pdev->dev, + "%s: SCI_IO_SUCCESS\n", + __func__); + + break; + + case SCI_IO_FAILURE_TERMINATED: + dev_dbg(&isci_host->pdev->dev, + "%s: SCI_IO_FAILURE_TERMINATED (%p/%p)\n", + __func__, + request, + task); + + /* The request was terminated explicitly. No handling + * is needed in the SCSI error handler path. + */ + request->complete_in_target = true; + response = SAS_TASK_UNDELIVERED; + + /* See if the device has been/is being stopped. Note + * that we ignore the quiesce state, since we are + * concerned about the actual device state. + */ + if ((isci_device->status == isci_stopping) || + (isci_device->status == isci_stopped)) + status = SAS_DEVICE_UNKNOWN; + else + status = SAS_ABORTED_TASK; + + complete_to_host = isci_perform_normal_io_completion; + break; + + case SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR: + + isci_request_handle_controller_specific_errors( + isci_device, request, task, &response, &status, + &complete_to_host); + + break; + + case SCI_IO_FAILURE_REMOTE_DEVICE_RESET_REQUIRED: + /* This is a special case, in that the I/O completion + * is telling us that the device needs a reset. + * In order for the device reset condition to be + * noticed, the I/O has to be handled in the error + * handler. Set the reset flag and cause the + * SCSI error thread to be scheduled. + */ + spin_lock_irqsave(&task->task_state_lock, task_flags); + task->task_state_flags |= SAS_TASK_NEED_DEV_RESET; spin_unlock_irqrestore(&task->task_state_lock, task_flags); - /* Fail the I/O. */ - response = SAS_TASK_UNDELIVERED; - status = SAM_STAT_TASK_ABORTED; + /* Fail the I/O. */ + response = SAS_TASK_UNDELIVERED; + status = SAM_STAT_TASK_ABORTED; + + complete_to_host = isci_perform_error_io_completion; + request->complete_in_target = false; + break; + + default: + /* Catch any otherwise unhandled error codes here. */ + dev_warn(&isci_host->pdev->dev, + "%s: invalid completion code: 0x%x - " + "isci_request = %p\n", + __func__, completion_status, request); + + response = SAS_TASK_UNDELIVERED; + + /* See if the device has been/is being stopped. Note + * that we ignore the quiesce state, since we are + * concerned about the actual device state. + */ + if ((isci_device->status == isci_stopping) || + (isci_device->status == isci_stopped)) + status = SAS_DEVICE_UNKNOWN; + else + status = SAS_ABORTED_TASK; + + complete_to_host = isci_perform_error_io_completion; + request->complete_in_target = false; + break; + } + break; + } + + isci_request_unmap_sgl(request, isci_host->pdev); + + /* Put the completed request on the correct list */ + isci_task_save_for_upper_layer_completion(isci_host, request, response, + status, complete_to_host + ); + + /* complete the io request to the core. */ + scic_controller_complete_io(&isci_host->sci, + &isci_device->sci, + &request->sci); + /* set terminated handle so it cannot be completed or + * terminated again, and to cause any calls into abort + * task to recognize the already completed case. + */ + request->terminated = true; + + isci_host_can_dequeue(isci_host, 1); +} + +/** + * scic_sds_request_initial_state_enter() - + * @object: This parameter specifies the base object for which the state + * transition is occurring. + * + * This method implements the actions taken when entering the + * SCI_BASE_REQUEST_STATE_INITIAL state. This state is entered when the initial + * base request is constructed. Entry into the initial state sets all handlers + * for the io request object to their default handlers. none + */ +static void scic_sds_request_initial_state_enter(void *object) +{ + struct scic_sds_request *sci_req = object; + + SET_STATE_HANDLER( + sci_req, + scic_sds_request_state_handler_table, + SCI_BASE_REQUEST_STATE_INITIAL + ); +} + +/** + * scic_sds_request_constructed_state_enter() - + * @object: The io request object that is to enter the constructed state. + * + * This method implements the actions taken when entering the + * SCI_BASE_REQUEST_STATE_CONSTRUCTED state. The method sets the state handlers + * for the the constructed state. none + */ +static void scic_sds_request_constructed_state_enter(void *object) +{ + struct scic_sds_request *sci_req = object; + + SET_STATE_HANDLER( + sci_req, + scic_sds_request_state_handler_table, + SCI_BASE_REQUEST_STATE_CONSTRUCTED + ); +} + +/** + * scic_sds_request_started_state_enter() - + * @object: This parameter specifies the base object for which the state + * transition is occurring. This is cast into a SCIC_SDS_IO_REQUEST object. + * + * This method implements the actions taken when entering the + * SCI_BASE_REQUEST_STATE_STARTED state. If the io request object type is a + * SCSI Task request we must enter the started substate machine. none + */ +static void scic_sds_request_started_state_enter(void *object) +{ + struct scic_sds_request *sci_req = object; + + SET_STATE_HANDLER( + sci_req, + scic_sds_request_state_handler_table, + SCI_BASE_REQUEST_STATE_STARTED + ); + + /* + * Most of the request state machines have a started substate machine so + * start its execution on the entry to the started state. */ + if (sci_req->has_started_substate_machine == true) + sci_base_state_machine_start(&sci_req->started_substate_machine); +} + +/** + * scic_sds_request_started_state_exit() - + * @object: This parameter specifies the base object for which the state + * transition is occurring. This object is cast into a SCIC_SDS_IO_REQUEST + * object. + * + * This method implements the actions taken when exiting the + * SCI_BASE_REQUEST_STATE_STARTED state. For task requests the action will be + * to stop the started substate machine. none + */ +static void scic_sds_request_started_state_exit(void *object) +{ + struct scic_sds_request *sci_req = object; + + if (sci_req->has_started_substate_machine == true) + sci_base_state_machine_stop(&sci_req->started_substate_machine); +} + +/** + * scic_sds_request_completed_state_enter() - + * @object: This parameter specifies the base object for which the state + * transition is occurring. This object is cast into a SCIC_SDS_IO_REQUEST + * object. + * + * This method implements the actions taken when entering the + * SCI_BASE_REQUEST_STATE_COMPLETED state. This state is entered when the + * SCIC_SDS_IO_REQUEST has completed. The method will decode the request + * completion status and convert it to an enum sci_status to return in the + * completion callback function. none + */ +static void scic_sds_request_completed_state_enter(void *object) +{ + struct scic_sds_request *sci_req = object; + struct scic_sds_controller *scic = + scic_sds_request_get_controller(sci_req); + struct isci_host *ihost = scic_to_ihost(scic); + struct isci_request *ireq = sci_req_to_ireq(sci_req); + + SET_STATE_HANDLER(sci_req, + scic_sds_request_state_handler_table, + SCI_BASE_REQUEST_STATE_COMPLETED); + + /* Tell the SCI_USER that the IO request is complete */ + if (sci_req->is_task_management_request == false) + isci_request_io_request_complete(ihost, ireq, + sci_req->sci_status); + else + isci_task_request_complete(ihost, ireq, sci_req->sci_status); +} + +/** + * scic_sds_request_aborting_state_enter() - + * @object: This parameter specifies the base object for which the state + * transition is occurring. This object is cast into a SCIC_SDS_IO_REQUEST + * object. + * + * This method implements the actions taken when entering the + * SCI_BASE_REQUEST_STATE_ABORTING state. none + */ +static void scic_sds_request_aborting_state_enter(void *object) +{ + struct scic_sds_request *sci_req = object; + + /* Setting the abort bit in the Task Context is required by the silicon. */ + sci_req->task_context_buffer->abort = 1; + + SET_STATE_HANDLER( + sci_req, + scic_sds_request_state_handler_table, + SCI_BASE_REQUEST_STATE_ABORTING + ); +} + +/** + * scic_sds_request_final_state_enter() - + * @object: This parameter specifies the base object for which the state + * transition is occurring. This is cast into a SCIC_SDS_IO_REQUEST object. + * + * This method implements the actions taken when entering the + * SCI_BASE_REQUEST_STATE_FINAL state. The only action required is to put the + * state handlers in place. none + */ +static void scic_sds_request_final_state_enter(void *object) +{ + struct scic_sds_request *sci_req = object; + + SET_STATE_HANDLER( + sci_req, + scic_sds_request_state_handler_table, + SCI_BASE_REQUEST_STATE_FINAL + ); +} + +static const struct sci_base_state scic_sds_request_state_table[] = { + [SCI_BASE_REQUEST_STATE_INITIAL] = { + .enter_state = scic_sds_request_initial_state_enter, + }, + [SCI_BASE_REQUEST_STATE_CONSTRUCTED] = { + .enter_state = scic_sds_request_constructed_state_enter, + }, + [SCI_BASE_REQUEST_STATE_STARTED] = { + .enter_state = scic_sds_request_started_state_enter, + .exit_state = scic_sds_request_started_state_exit + }, + [SCI_BASE_REQUEST_STATE_COMPLETED] = { + .enter_state = scic_sds_request_completed_state_enter, + }, + [SCI_BASE_REQUEST_STATE_ABORTING] = { + .enter_state = scic_sds_request_aborting_state_enter, + }, + [SCI_BASE_REQUEST_STATE_FINAL] = { + .enter_state = scic_sds_request_final_state_enter, + }, +}; + +static void scic_sds_general_request_construct(struct scic_sds_controller *scic, + struct scic_sds_remote_device *sci_dev, + u16 io_tag, struct scic_sds_request *sci_req) +{ + sci_base_state_machine_construct(&sci_req->state_machine, sci_req, + scic_sds_request_state_table, SCI_BASE_REQUEST_STATE_INITIAL); + sci_base_state_machine_start(&sci_req->state_machine); + + sci_req->io_tag = io_tag; + sci_req->owning_controller = scic; + sci_req->target_device = sci_dev; + sci_req->has_started_substate_machine = false; + sci_req->protocol = SCIC_NO_PROTOCOL; + sci_req->saved_rx_frame_index = SCU_INVALID_FRAME_INDEX; + sci_req->device_sequence = scic_sds_remote_device_get_sequence(sci_dev); + + sci_req->sci_status = SCI_SUCCESS; + sci_req->scu_status = 0; + sci_req->post_context = 0xFFFFFFFF; + + sci_req->is_task_management_request = false; + + if (io_tag == SCI_CONTROLLER_INVALID_IO_TAG) { + sci_req->was_tag_assigned_by_user = false; + sci_req->task_context_buffer = NULL; + } else { + sci_req->was_tag_assigned_by_user = true; + + sci_req->task_context_buffer = + scic_sds_controller_get_task_context_buffer(scic, io_tag); + } +} + +static enum sci_status +scic_io_request_construct(struct scic_sds_controller *scic, + struct scic_sds_remote_device *sci_dev, + u16 io_tag, struct scic_sds_request *sci_req) +{ + struct domain_device *dev = sci_dev_to_domain(sci_dev); + enum sci_status status = SCI_SUCCESS; + + /* Build the common part of the request */ + scic_sds_general_request_construct(scic, sci_dev, io_tag, sci_req); + + if (sci_dev->rnc.remote_node_index == + SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX) + return SCI_FAILURE_INVALID_REMOTE_DEVICE; + + if (dev->dev_type == SAS_END_DEV) + scic_sds_ssp_io_request_assign_buffers(sci_req); + else if ((dev->dev_type == SATA_DEV) || + (dev->tproto & SAS_PROTOCOL_STP)) { + scic_sds_stp_request_assign_buffers(sci_req); + memset(&sci_req->stp.cmd, 0, sizeof(sci_req->stp.cmd)); + } else if (dev_is_expander(dev)) { + scic_sds_smp_request_assign_buffers(sci_req); + memset(&sci_req->smp.cmd, 0, sizeof(sci_req->smp.cmd)); + } else + status = SCI_FAILURE_UNSUPPORTED_PROTOCOL; + + if (status == SCI_SUCCESS) { + memset(sci_req->task_context_buffer, 0, + offsetof(struct scu_task_context, sgl_pair_ab)); + } + + return status; +} + +enum sci_status scic_task_request_construct(struct scic_sds_controller *scic, + struct scic_sds_remote_device *sci_dev, + u16 io_tag, struct scic_sds_request *sci_req) +{ + struct domain_device *dev = sci_dev_to_domain(sci_dev); + enum sci_status status = SCI_SUCCESS; + + /* Build the common part of the request */ + scic_sds_general_request_construct(scic, sci_dev, io_tag, sci_req); + + if (dev->dev_type == SAS_END_DEV) { + scic_sds_ssp_task_request_assign_buffers(sci_req); + + sci_req->has_started_substate_machine = true; + + /* Construct the started sub-state machine. */ + sci_base_state_machine_construct( + &sci_req->started_substate_machine, + sci_req, + scic_sds_io_request_started_task_mgmt_substate_table, + SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_COMPLETION + ); + } else if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) + scic_sds_stp_request_assign_buffers(sci_req); + else + status = SCI_FAILURE_UNSUPPORTED_PROTOCOL; + + if (status == SCI_SUCCESS) { + sci_req->is_task_management_request = true; + memset(sci_req->task_context_buffer, 0, sizeof(struct scu_task_context)); + } + + return status; +} + +static enum sci_status isci_request_ssp_request_construct( + struct isci_request *request) +{ + enum sci_status status; + + dev_dbg(&request->isci_host->pdev->dev, + "%s: request = %p\n", + __func__, + request); + status = scic_io_request_construct_basic_ssp(&request->sci); + return status; +} + +static enum sci_status isci_request_stp_request_construct( + struct isci_request *request) +{ + struct sas_task *task = isci_request_access_task(request); + enum sci_status status; + struct host_to_dev_fis *register_fis; + + dev_dbg(&request->isci_host->pdev->dev, + "%s: request = %p\n", + __func__, + request); + + /* Get the host_to_dev_fis from the core and copy + * the fis from the task into it. + */ + register_fis = isci_sata_task_to_fis_copy(task); + + status = scic_io_request_construct_basic_sata(&request->sci); + + /* Set the ncq tag in the fis, from the queue + * command in the task. + */ + if (isci_sata_is_task_ncq(task)) { + + isci_sata_set_ncq_tag( + register_fis, + task + ); + } + + return status; +} + +/* + * isci_smp_request_build() - This function builds the smp request. + * @ireq: This parameter points to the isci_request allocated in the + * request construct function. + * + * SCI_SUCCESS on successfull completion, or specific failure code. + */ +static enum sci_status isci_smp_request_build(struct isci_request *ireq) +{ + enum sci_status status = SCI_FAILURE; + struct sas_task *task = isci_request_access_task(ireq); + struct scic_sds_request *sci_req = &ireq->sci; + + dev_dbg(&ireq->isci_host->pdev->dev, + "%s: request = %p\n", __func__, ireq); + + dev_dbg(&ireq->isci_host->pdev->dev, + "%s: smp_req len = %d\n", + __func__, + task->smp_task.smp_req.length); + + /* copy the smp_command to the address; */ + sg_copy_to_buffer(&task->smp_task.smp_req, 1, + &sci_req->smp.cmd, + sizeof(struct smp_req)); + + status = scic_io_request_construct_smp(sci_req); + if (status != SCI_SUCCESS) + dev_warn(&ireq->isci_host->pdev->dev, + "%s: failed with status = %d\n", + __func__, + status); + + return status; +} + +/** + * isci_io_request_build() - This function builds the io request object. + * @isci_host: This parameter specifies the ISCI host object + * @request: This parameter points to the isci_request object allocated in the + * request construct function. + * @sci_device: This parameter is the handle for the sci core's remote device + * object that is the destination for this request. + * + * SCI_SUCCESS on successfull completion, or specific failure code. + */ +static enum sci_status isci_io_request_build( + struct isci_host *isci_host, + struct isci_request *request, + struct isci_remote_device *isci_device) +{ + enum sci_status status = SCI_SUCCESS; + struct sas_task *task = isci_request_access_task(request); + struct scic_sds_remote_device *sci_device = &isci_device->sci; + + dev_dbg(&isci_host->pdev->dev, + "%s: isci_device = 0x%p; request = %p, " + "num_scatter = %d\n", + __func__, + isci_device, + request, + task->num_scatter); + + /* map the sgl addresses, if present. + * libata does the mapping for sata devices + * before we get the request. + */ + if (task->num_scatter && + !sas_protocol_ata(task->task_proto) && + !(SAS_PROTOCOL_SMP & task->task_proto)) { + + request->num_sg_entries = dma_map_sg( + &isci_host->pdev->dev, + task->scatter, + task->num_scatter, + task->data_dir + ); + + if (request->num_sg_entries == 0) + return SCI_FAILURE_INSUFFICIENT_RESOURCES; + } + + /* build the common request object. For now, + * we will let the core allocate the IO tag. + */ + status = scic_io_request_construct(&isci_host->sci, sci_device, + SCI_CONTROLLER_INVALID_IO_TAG, + &request->sci); + + if (status != SCI_SUCCESS) { + dev_warn(&isci_host->pdev->dev, + "%s: failed request construct\n", + __func__); + return SCI_FAILURE; + } + + switch (task->task_proto) { + case SAS_PROTOCOL_SMP: + status = isci_smp_request_build(request); + break; + case SAS_PROTOCOL_SSP: + status = isci_request_ssp_request_construct(request); + break; + case SAS_PROTOCOL_SATA: + case SAS_PROTOCOL_STP: + case SAS_PROTOCOL_SATA | SAS_PROTOCOL_STP: + status = isci_request_stp_request_construct(request); + break; + default: + dev_warn(&isci_host->pdev->dev, + "%s: unknown protocol\n", __func__); + return SCI_FAILURE; + } + + return SCI_SUCCESS; +} + +/** + * isci_request_alloc_core() - This function gets the request object from the + * isci_host dma cache. + * @isci_host: This parameter specifies the ISCI host object + * @isci_request: This parameter will contain the pointer to the new + * isci_request object. + * @isci_device: This parameter is the pointer to the isci remote device object + * that is the destination for this request. + * @gfp_flags: This parameter specifies the os allocation flags. + * + * SCI_SUCCESS on successfull completion, or specific failure code. + */ +static int isci_request_alloc_core( + struct isci_host *isci_host, + struct isci_request **isci_request, + struct isci_remote_device *isci_device, + gfp_t gfp_flags) +{ + int ret = 0; + dma_addr_t handle; + struct isci_request *request; + - complete_to_host = isci_perform_error_io_completion; - request->complete_in_target = false; - break; + /* get pointer to dma memory. This actually points + * to both the isci_remote_device object and the + * sci object. The isci object is at the beginning + * of the memory allocated here. + */ + request = dma_pool_alloc(isci_host->dma_pool, gfp_flags, &handle); + if (!request) { + dev_warn(&isci_host->pdev->dev, + "%s: dma_pool_alloc returned NULL\n", __func__); + return -ENOMEM; + } - default: - /* Catch any otherwise unhandled error codes here. */ - dev_warn(&isci_host->pdev->dev, - "%s: invalid completion code: 0x%x - " - "isci_request = %p\n", - __func__, completion_status, request); + /* initialize the request object. */ + spin_lock_init(&request->state_lock); + request->request_daddr = handle; + request->isci_host = isci_host; + request->isci_device = isci_device; + request->io_request_completion = NULL; + request->terminated = false; - response = SAS_TASK_UNDELIVERED; + request->num_sg_entries = 0; - /* See if the device has been/is being stopped. Note - * that we ignore the quiesce state, since we are - * concerned about the actual device state. - */ - if ((isci_device->status == isci_stopping) || - (isci_device->status == isci_stopped)) - status = SAS_DEVICE_UNKNOWN; - else - status = SAS_ABORTED_TASK; + request->complete_in_target = false; - complete_to_host = isci_perform_error_io_completion; - request->complete_in_target = false; - break; - } - break; + INIT_LIST_HEAD(&request->completed_node); + INIT_LIST_HEAD(&request->dev_node); + + *isci_request = request; + isci_request_change_state(request, allocated); + + return ret; +} + +static int isci_request_alloc_io( + struct isci_host *isci_host, + struct sas_task *task, + struct isci_request **isci_request, + struct isci_remote_device *isci_device, + gfp_t gfp_flags) +{ + int retval = isci_request_alloc_core(isci_host, isci_request, + isci_device, gfp_flags); + + if (!retval) { + (*isci_request)->ttype_ptr.io_task_ptr = task; + (*isci_request)->ttype = io_task; + + task->lldd_task = *isci_request; } + return retval; +} - isci_request_unmap_sgl(request, isci_host->pdev); +/** + * isci_request_alloc_tmf() - This function gets the request object from the + * isci_host dma cache and initializes the relevant fields as a sas_task. + * @isci_host: This parameter specifies the ISCI host object + * @sas_task: This parameter is the task struct from the upper layer driver. + * @isci_request: This parameter will contain the pointer to the new + * isci_request object. + * @isci_device: This parameter is the pointer to the isci remote device object + * that is the destination for this request. + * @gfp_flags: This parameter specifies the os allocation flags. + * + * SCI_SUCCESS on successfull completion, or specific failure code. + */ +int isci_request_alloc_tmf( + struct isci_host *isci_host, + struct isci_tmf *isci_tmf, + struct isci_request **isci_request, + struct isci_remote_device *isci_device, + gfp_t gfp_flags) +{ + int retval = isci_request_alloc_core(isci_host, isci_request, + isci_device, gfp_flags); - /* Put the completed request on the correct list */ - isci_task_save_for_upper_layer_completion(isci_host, request, response, - status, complete_to_host - ); + if (!retval) { - /* complete the io request to the core. */ - scic_controller_complete_io(&isci_host->sci, - &isci_device->sci, - &request->sci); - /* set terminated handle so it cannot be completed or - * terminated again, and to cause any calls into abort - * task to recognize the already completed case. + (*isci_request)->ttype_ptr.tmf_task_ptr = isci_tmf; + (*isci_request)->ttype = tmf_task; + } + return retval; +} + +/** + * isci_request_execute() - This function allocates the isci_request object, + * all fills in some common fields. + * @isci_host: This parameter specifies the ISCI host object + * @sas_task: This parameter is the task struct from the upper layer driver. + * @isci_request: This parameter will contain the pointer to the new + * isci_request object. + * @gfp_flags: This parameter specifies the os allocation flags. + * + * SCI_SUCCESS on successfull completion, or specific failure code. + */ +int isci_request_execute( + struct isci_host *isci_host, + struct sas_task *task, + struct isci_request **isci_request, + gfp_t gfp_flags) +{ + int ret = 0; + struct scic_sds_remote_device *sci_device; + enum sci_status status = SCI_FAILURE_UNSUPPORTED_PROTOCOL; + struct isci_remote_device *isci_device; + struct isci_request *request; + unsigned long flags; + + isci_device = task->dev->lldd_dev; + sci_device = &isci_device->sci; + + /* do common allocation and init of request object. */ + ret = isci_request_alloc_io( + isci_host, + task, + &request, + isci_device, + gfp_flags + ); + + if (ret) + goto out; + + status = isci_io_request_build(isci_host, request, isci_device); + if (status != SCI_SUCCESS) { + dev_warn(&isci_host->pdev->dev, + "%s: request_construct failed - status = 0x%x\n", + __func__, + status); + goto out; + } + + spin_lock_irqsave(&isci_host->scic_lock, flags); + + /* send the request, let the core assign the IO TAG. */ + status = scic_controller_start_io(&isci_host->sci, sci_device, + &request->sci, + SCI_CONTROLLER_INVALID_IO_TAG); + if (status != SCI_SUCCESS && + status != SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) { + dev_warn(&isci_host->pdev->dev, + "%s: failed request start (0x%x)\n", + __func__, status); + spin_unlock_irqrestore(&isci_host->scic_lock, flags); + goto out; + } + + /* Either I/O started OK, or the core has signaled that + * the device needs a target reset. + * + * In either case, hold onto the I/O for later. + * + * Update it's status and add it to the list in the + * remote device object. */ - request->terminated = true; + isci_request_change_state(request, started); + list_add(&request->dev_node, &isci_device->reqs_in_process); - isci_host_can_dequeue(isci_host, 1); + if (status == SCI_SUCCESS) { + /* Save the tag for possible task mgmt later. */ + request->io_tag = request->sci.io_tag; + } else { + /* The request did not really start in the + * hardware, so clear the request handle + * here so no terminations will be done. + */ + request->terminated = true; + } + spin_unlock_irqrestore(&isci_host->scic_lock, flags); + + if (status == + SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) { + /* Signal libsas that we need the SCSI error + * handler thread to work on this I/O and that + * we want a device reset. + */ + spin_lock_irqsave(&task->task_state_lock, flags); + task->task_state_flags |= SAS_TASK_NEED_DEV_RESET; + spin_unlock_irqrestore(&task->task_state_lock, flags); + + /* Cause this task to be scheduled in the SCSI error + * handler thread. + */ + isci_execpath_callback(isci_host, task, + sas_task_abort); + + /* Change the status, since we are holding + * the I/O until it is managed by the SCSI + * error handler. + */ + status = SCI_SUCCESS; + } + + out: + if (status != SCI_SUCCESS) { + /* release dma memory on failure. */ + isci_request_free(isci_host, request); + request = NULL; + ret = SCI_FAILURE; + } + + *isci_request = request; + return ret; } + + + -- cgit