diff options
Diffstat (limited to 'drivers/staging/keucr/scsiglue.c')
| -rw-r--r-- | drivers/staging/keucr/scsiglue.c | 467 |
1 files changed, 0 insertions, 467 deletions
diff --git a/drivers/staging/keucr/scsiglue.c b/drivers/staging/keucr/scsiglue.c deleted file mode 100644 index 7d8d444910c1..000000000000 --- a/drivers/staging/keucr/scsiglue.c +++ /dev/null @@ -1,467 +0,0 @@ -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/slab.h> -#include <linux/module.h> -#include <linux/mutex.h> - -#include <scsi/scsi.h> -#include <scsi/scsi_cmnd.h> -#include <scsi/scsi_devinfo.h> -#include <scsi/scsi_device.h> -#include <scsi/scsi_eh.h> - -#include "usb.h" -#include "scsiglue.h" -#include "transport.h" - -/* Host functions */ -/* - * host_info() - */ -static const char *host_info(struct Scsi_Host *host) -{ - /* pr_info("scsiglue --- host_info\n"); */ - return "SCSI emulation for USB Mass Storage devices"; -} - -/* - * slave_alloc() - */ -static int slave_alloc(struct scsi_device *sdev) -{ - struct us_data *us = host_to_us(sdev->host); - - /* pr_info("scsiglue --- slave_alloc\n"); */ - sdev->inquiry_len = 36; - - blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1)); - - if (us->subclass == USB_SC_UFI) - sdev->sdev_target->pdt_1f_for_no_lun = 1; - - return 0; -} - -/* - * slave_configure() - */ -static int slave_configure(struct scsi_device *sdev) -{ - struct us_data *us = host_to_us(sdev->host); - - /* pr_info("scsiglue --- slave_configure\n"); */ - if (us->fflags & (US_FL_MAX_SECTORS_64 | US_FL_MAX_SECTORS_MIN)) { - unsigned int max_sectors = 64; - - if (us->fflags & US_FL_MAX_SECTORS_MIN) - max_sectors = PAGE_CACHE_SIZE >> 9; - if (queue_max_sectors(sdev->request_queue) > max_sectors) - blk_queue_max_hw_sectors(sdev->request_queue, - max_sectors); - } - - if (sdev->type == TYPE_DISK) { - if (us->subclass != USB_SC_SCSI && - us->subclass != USB_SC_CYP_ATACB) - sdev->use_10_for_ms = 1; - sdev->use_192_bytes_for_3f = 1; - if (us->fflags & US_FL_NO_WP_DETECT) - sdev->skip_ms_page_3f = 1; - sdev->skip_ms_page_8 = 1; - if (us->fflags & US_FL_FIX_CAPACITY) - sdev->fix_capacity = 1; - if (us->fflags & US_FL_CAPACITY_HEURISTICS) - sdev->guess_capacity = 1; - if (sdev->scsi_level > SCSI_2) - sdev->sdev_target->scsi_level = sdev->scsi_level - = SCSI_2; - sdev->retry_hwerror = 1; - sdev->allow_restart = 1; - sdev->last_sector_bug = 1; - } else { - sdev->use_10_for_ms = 1; - } - - if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_CBI) && - sdev->scsi_level == SCSI_UNKNOWN) - us->max_lun = 0; - - if (us->fflags & US_FL_NOT_LOCKABLE) - sdev->lockable = 0; - - return 0; -} - -/* This is always called with scsi_lock(host) held */ -/* - * queuecommand() - */ -static int queuecommand_lck(struct scsi_cmnd *srb, - void (*done)(struct scsi_cmnd *)) -{ - struct us_data *us = host_to_us(srb->device->host); - - /* pr_info("scsiglue --- queuecommand\n"); */ - - /* check for state-transition errors */ - if (us->srb != NULL) { - /* pr_info("Error in %s: us->srb = %p\n" - __func__, us->srb); */ - return SCSI_MLQUEUE_HOST_BUSY; - } - - /* fail the command if we are disconnecting */ - if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { - pr_info("Fail command during disconnect\n"); - srb->result = DID_NO_CONNECT << 16; - done(srb); - return 0; - } - - /* enqueue the command and wake up the control thread */ - srb->scsi_done = done; - us->srb = srb; - complete(&us->cmnd_ready); - - return 0; -} - -static DEF_SCSI_QCMD(queuecommand) - -/*********************************************************************** - * Error handling functions - ***********************************************************************/ - -/* Command timeout and abort */ -/* - * command_abort() - */ -static int command_abort(struct scsi_cmnd *srb) -{ - struct us_data *us = host_to_us(srb->device->host); - - /* pr_info("scsiglue --- command_abort\n"); */ - - scsi_lock(us_to_host(us)); - if (us->srb != srb) { - scsi_unlock(us_to_host(us)); - dev_info(&us->pusb_dev->dev, "-- nothing to abort\n"); - return FAILED; - } - - set_bit(US_FLIDX_TIMED_OUT, &us->dflags); - if (!test_bit(US_FLIDX_RESETTING, &us->dflags)) { - set_bit(US_FLIDX_ABORTING, &us->dflags); - usb_stor_stop_transport(us); - } - scsi_unlock(us_to_host(us)); - - /* Wait for the aborted command to finish */ - wait_for_completion(&us->notify); - return SUCCESS; -} - -/* This invokes the transport reset mechanism to reset the state of the - * device. - */ -/* - * device_reset() - */ -static int device_reset(struct scsi_cmnd *srb) -{ - struct us_data *us = host_to_us(srb->device->host); - int result; - - /* pr_info("scsiglue --- device_reset\n"); */ - - /* lock the device pointers and do the reset */ - mutex_lock(&(us->dev_mutex)); - result = us->transport_reset(us); - mutex_unlock(&us->dev_mutex); - - return result < 0 ? FAILED : SUCCESS; -} - -/* - * bus_reset() - */ -static int bus_reset(struct scsi_cmnd *srb) -{ - struct us_data *us = host_to_us(srb->device->host); - int result; - - /* pr_info("scsiglue --- bus_reset\n"); */ - result = usb_stor_port_reset(us); - return result < 0 ? FAILED : SUCCESS; -} - -/* - * usb_stor_report_device_reset() - */ -void usb_stor_report_device_reset(struct us_data *us) -{ - int i; - struct Scsi_Host *host = us_to_host(us); - - /* pr_info("scsiglue --- usb_stor_report_device_reset\n"); */ - scsi_report_device_reset(host, 0, 0); - if (us->fflags & US_FL_SCM_MULT_TARG) { - for (i = 1; i < host->max_id; ++i) - scsi_report_device_reset(host, 0, i); - } -} - -/* - * usb_stor_report_bus_reset() - */ -void usb_stor_report_bus_reset(struct us_data *us) -{ - struct Scsi_Host *host = us_to_host(us); - - /* pr_info("scsiglue --- usb_stor_report_bus_reset\n"); */ - scsi_lock(host); - scsi_report_bus_reset(host, 0); - scsi_unlock(host); -} - -/*********************************************************************** - * /proc/scsi/ functions - ***********************************************************************/ - -/* we use this macro to help us write into the buffer */ -#undef SPRINTF -#define SPRINTF(args...) seq_printf(m, ##args) - -static int write_info(struct Scsi_Host *host, char *buffer, int length) -{ - return length; -} - -static int show_info(struct seq_file *m, struct Scsi_Host *host) -{ - struct us_data *us = host_to_us(host); - const char *string; - - /* print the controller name */ - SPRINTF(" Host scsi%d: usb-storage\n", host->host_no); - - /* print product, vendor, and serial number strings */ - if (us->pusb_dev->manufacturer) - string = us->pusb_dev->manufacturer; - else if (us->unusual_dev->vendorName) - string = us->unusual_dev->vendorName; - else - string = "Unknown"; - SPRINTF(" Vendor: %s\n", string); - if (us->pusb_dev->product) - string = us->pusb_dev->product; - else if (us->unusual_dev->productName) - string = us->unusual_dev->productName; - else - string = "Unknown"; - SPRINTF(" Product: %s\n", string); - if (us->pusb_dev->serial) - string = us->pusb_dev->serial; - else - string = "None"; - SPRINTF("Serial Number: %s\n", string); - - /* show the protocol and transport */ - SPRINTF(" Protocol: %s\n", us->protocol_name); - SPRINTF(" Transport: %s\n", us->transport_name); - - /* show the device flags */ - SPRINTF(" Quirks:"); - -#define US_FLAG(name, value) \ - do { \ - if (us->fflags & value) \ - SPRINTF(" " #name); \ - } while (0); -US_DO_ALL_FLAGS -#undef US_FLAG - seq_putc(m, '\n'); - return 0; -} - -/*********************************************************************** - * Sysfs interface - ***********************************************************************/ - -/* Output routine for the sysfs max_sectors file */ -static ssize_t max_sectors_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct scsi_device *sdev = to_scsi_device(dev); - - /* pr_info("scsiglue --- ssize_t show_max_sectors\n"); */ - return sprintf(buf, "%u\n", queue_max_sectors(sdev->request_queue)); -} - -/* Input routine for the sysfs max_sectors file */ -static ssize_t max_sectors_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - struct scsi_device *sdev = to_scsi_device(dev); - unsigned short ms; - - /* pr_info("scsiglue --- ssize_t store_max_sectors\n"); */ - if (sscanf(buf, "%hu", &ms) > 0 && ms <= SCSI_DEFAULT_MAX_SECTORS) { - blk_queue_max_hw_sectors(sdev->request_queue, ms); - return strlen(buf); - } - return -EINVAL; -} -static DEVICE_ATTR_RW(max_sectors); - -static struct device_attribute *sysfs_device_attr_list[] = { - &dev_attr_max_sectors, NULL, -}; - -/* this defines our host template, with which we'll allocate hosts */ - -/* - * usb_stor_host_template() - */ -struct scsi_host_template usb_stor_host_template = { - /* basic userland interface stuff */ - .name = "eucr-storage", - .proc_name = "eucr-storage", - .write_info = write_info, - .show_info = show_info, - .info = host_info, - - /* command interface -- queued only */ - .queuecommand = queuecommand, - - /* error and abort handlers */ - .eh_abort_handler = command_abort, - .eh_device_reset_handler = device_reset, - .eh_bus_reset_handler = bus_reset, - - /* queue commands only, only one command per LUN */ - .can_queue = 1, - .cmd_per_lun = 1, - - /* unknown initiator id */ - .this_id = -1, - - .slave_alloc = slave_alloc, - .slave_configure = slave_configure, - - /* lots of sg segments can be handled */ - .sg_tablesize = SG_ALL, - - /* limit the total size of a transfer to 120 KB */ - .max_sectors = 240, - - /* merge commands... this seems to help performance, but - * periodically someone should test to see which setting is more - * optimal. - */ - .use_clustering = 1, - - /* emulated HBA */ - .emulated = 1, - - /* we do our own delay after a device or bus reset */ - .skip_settle_delay = 1, - - /* sysfs device attributes */ - .sdev_attrs = sysfs_device_attr_list, - - /* module management */ - .module = THIS_MODULE -}; - -/* To Report "Illegal Request: Invalid Field in CDB */ -unsigned char usb_stor_sense_invalidCDB[18] = { - [0] = 0x70, /* current error */ - [2] = ILLEGAL_REQUEST, /* Illegal Request = 0x05 */ - [7] = 0x0a, /* additional length */ - [12] = 0x24 /* Invalid Field in CDB */ -}; - -/*********************************************************************** - * Scatter-gather transfer buffer access routines - ***********************************************************************/ - -/* - * usb_stor_access_xfer_buf() - */ -unsigned int usb_stor_access_xfer_buf(struct us_data *us, - unsigned char *buffer, unsigned int buflen, - struct scsi_cmnd *srb, struct scatterlist **sgptr, - unsigned int *offset, enum xfer_buf_dir dir) -{ - unsigned int cnt; - - /* pr_info("transport --- usb_stor_access_xfer_buf\n"); */ - struct scatterlist *sg = *sgptr; - - if (!sg) - sg = scsi_sglist(srb); - - cnt = 0; - while (cnt < buflen && sg) { - struct page *page = sg_page(sg) + - ((sg->offset + *offset) >> PAGE_SHIFT); - unsigned int poff = (sg->offset + *offset) & (PAGE_SIZE-1); - unsigned int sglen = sg->length - *offset; - - if (sglen > buflen - cnt) { - /* Transfer ends within this s-g entry */ - sglen = buflen - cnt; - *offset += sglen; - } else { - /* Transfer continues to next s-g entry */ - *offset = 0; - sg = sg_next(sg); - } - - while (sglen > 0) { - unsigned int plen = min(sglen, - (unsigned int)PAGE_SIZE - poff); - unsigned char *ptr = kmap(page); - - if (dir == TO_XFER_BUF) - memcpy(ptr + poff, buffer + cnt, plen); - else - memcpy(buffer + cnt, ptr + poff, plen); - kunmap(page); - - /* Start at the beginning of the next page */ - poff = 0; - ++page; - cnt += plen; - sglen -= plen; - } - } - *sgptr = sg; - - /* Return the amount actually transferred */ - return cnt; -} - -/* - * Store the contents of buffer into srb's transfer - * buffer and set the SCSI residue. - */ -/* - * usb_stor_set_xfer_buf() - */ -void usb_stor_set_xfer_buf(struct us_data *us, unsigned char *buffer, - unsigned int buflen, struct scsi_cmnd *srb, unsigned int dir) -{ - unsigned int offset = 0; - struct scatterlist *sg = NULL; - - /* pr_info("transport --- usb_stor_set_xfer_buf\n"); */ - /* TO_XFER_BUF = 0, FROM_XFER_BUF = 1 */ - buflen = min(buflen, scsi_bufflen(srb)); - buflen = usb_stor_access_xfer_buf(us, buffer, buflen, srb, - &sg, &offset, dir); - if (buflen < scsi_bufflen(srb)) - scsi_set_resid(srb, scsi_bufflen(srb) - buflen); -} |