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path: root/drivers/visorbus/visorchipset.c
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Diffstat (limited to 'drivers/visorbus/visorchipset.c')
-rw-r--r--drivers/visorbus/visorchipset.c1686
1 files changed, 1686 insertions, 0 deletions
diff --git a/drivers/visorbus/visorchipset.c b/drivers/visorbus/visorchipset.c
new file mode 100644
index 000000000000..ca752b8f495f
--- /dev/null
+++ b/drivers/visorbus/visorchipset.c
@@ -0,0 +1,1686 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2010 - 2015 UNISYS CORPORATION
+ * All rights reserved.
+ */
+
+#include <linux/acpi.h>
+#include <linux/crash_dump.h>
+#include <linux/visorbus.h>
+
+#include "visorbus_private.h"
+
+/* {72120008-4AAB-11DC-8530-444553544200} */
+#define VISOR_SIOVM_GUID GUID_INIT(0x72120008, 0x4AAB, 0x11DC, 0x85, 0x30, \
+ 0x44, 0x45, 0x53, 0x54, 0x42, 0x00)
+
+static const guid_t visor_vhba_channel_guid = VISOR_VHBA_CHANNEL_GUID;
+static const guid_t visor_siovm_guid = VISOR_SIOVM_GUID;
+static const guid_t visor_controlvm_channel_guid = VISOR_CONTROLVM_CHANNEL_GUID;
+
+#define POLLJIFFIES_CONTROLVM_FAST 1
+#define POLLJIFFIES_CONTROLVM_SLOW 100
+
+#define MAX_CONTROLVM_PAYLOAD_BYTES (1024 * 128)
+
+#define UNISYS_VISOR_LEAF_ID 0x40000000
+
+/* The s-Par leaf ID returns "UnisysSpar64" encoded across ebx, ecx, edx */
+#define UNISYS_VISOR_ID_EBX 0x73696e55
+#define UNISYS_VISOR_ID_ECX 0x70537379
+#define UNISYS_VISOR_ID_EDX 0x34367261
+
+/*
+ * When the controlvm channel is idle for at least MIN_IDLE_SECONDS, we switch
+ * to slow polling mode. As soon as we get a controlvm message, we switch back
+ * to fast polling mode.
+ */
+#define MIN_IDLE_SECONDS 10
+
+struct parser_context {
+ unsigned long allocbytes;
+ unsigned long param_bytes;
+ u8 *curr;
+ unsigned long bytes_remaining;
+ bool byte_stream;
+ struct visor_controlvm_parameters_header data;
+};
+
+/* VMCALL_CONTROLVM_ADDR: Used by all guests, not just IO. */
+#define VMCALL_CONTROLVM_ADDR 0x0501
+
+enum vmcall_result {
+ VMCALL_RESULT_SUCCESS = 0,
+ VMCALL_RESULT_INVALID_PARAM = 1,
+ VMCALL_RESULT_DATA_UNAVAILABLE = 2,
+ VMCALL_RESULT_FAILURE_UNAVAILABLE = 3,
+ VMCALL_RESULT_DEVICE_ERROR = 4,
+ VMCALL_RESULT_DEVICE_NOT_READY = 5
+};
+
+/*
+ * struct vmcall_io_controlvm_addr_params - Structure for IO VMCALLS. Has
+ * parameters to VMCALL_CONTROLVM_ADDR
+ * interface.
+ * @address: The Guest-relative physical address of the ControlVm channel.
+ * This VMCall fills this in with the appropriate address.
+ * Contents provided by this VMCALL (OUT).
+ * @channel_bytes: The size of the ControlVm channel in bytes This VMCall fills
+ * this in with the appropriate address. Contents provided by
+ * this VMCALL (OUT).
+ * @unused: Unused Bytes in the 64-Bit Aligned Struct.
+ */
+struct vmcall_io_controlvm_addr_params {
+ u64 address;
+ u32 channel_bytes;
+ u8 unused[4];
+} __packed;
+
+struct visorchipset_device {
+ struct acpi_device *acpi_device;
+ unsigned long poll_jiffies;
+ /* when we got our last controlvm message */
+ unsigned long most_recent_message_jiffies;
+ struct delayed_work periodic_controlvm_work;
+ struct visorchannel *controlvm_channel;
+ unsigned long controlvm_payload_bytes_buffered;
+ /*
+ * The following variables are used to handle the scenario where we are
+ * unable to offload the payload from a controlvm message due to memory
+ * requirements. In this scenario, we simply stash the controlvm
+ * message, then attempt to process it again the next time
+ * controlvm_periodic_work() runs.
+ */
+ struct controlvm_message controlvm_pending_msg;
+ bool controlvm_pending_msg_valid;
+ struct vmcall_io_controlvm_addr_params controlvm_params;
+};
+
+static struct visorchipset_device *chipset_dev;
+
+struct parahotplug_request {
+ struct list_head list;
+ int id;
+ unsigned long expiration;
+ struct controlvm_message msg;
+};
+
+/* prototypes for attributes */
+static ssize_t toolaction_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ u8 tool_action = 0;
+ int err;
+
+ err = visorchannel_read(chipset_dev->controlvm_channel,
+ offsetof(struct visor_controlvm_channel,
+ tool_action),
+ &tool_action, sizeof(u8));
+ if (err)
+ return err;
+ return sprintf(buf, "%u\n", tool_action);
+}
+
+static ssize_t toolaction_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ u8 tool_action;
+ int err;
+
+ if (kstrtou8(buf, 10, &tool_action))
+ return -EINVAL;
+ err = visorchannel_write(chipset_dev->controlvm_channel,
+ offsetof(struct visor_controlvm_channel,
+ tool_action),
+ &tool_action, sizeof(u8));
+ if (err)
+ return err;
+ return count;
+}
+static DEVICE_ATTR_RW(toolaction);
+
+static ssize_t boottotool_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct efi_visor_indication efi_visor_indication;
+ int err;
+
+ err = visorchannel_read(chipset_dev->controlvm_channel,
+ offsetof(struct visor_controlvm_channel,
+ efi_visor_ind),
+ &efi_visor_indication,
+ sizeof(struct efi_visor_indication));
+ if (err)
+ return err;
+ return sprintf(buf, "%u\n", efi_visor_indication.boot_to_tool);
+}
+
+static ssize_t boottotool_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int val, err;
+ struct efi_visor_indication efi_visor_indication;
+
+ if (kstrtoint(buf, 10, &val))
+ return -EINVAL;
+ efi_visor_indication.boot_to_tool = val;
+ err = visorchannel_write(chipset_dev->controlvm_channel,
+ offsetof(struct visor_controlvm_channel,
+ efi_visor_ind),
+ &(efi_visor_indication),
+ sizeof(struct efi_visor_indication));
+ if (err)
+ return err;
+ return count;
+}
+static DEVICE_ATTR_RW(boottotool);
+
+static ssize_t error_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ u32 error = 0;
+ int err;
+
+ err = visorchannel_read(chipset_dev->controlvm_channel,
+ offsetof(struct visor_controlvm_channel,
+ installation_error),
+ &error, sizeof(u32));
+ if (err)
+ return err;
+ return sprintf(buf, "%u\n", error);
+}
+
+static ssize_t error_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ u32 error;
+ int err;
+
+ if (kstrtou32(buf, 10, &error))
+ return -EINVAL;
+ err = visorchannel_write(chipset_dev->controlvm_channel,
+ offsetof(struct visor_controlvm_channel,
+ installation_error),
+ &error, sizeof(u32));
+ if (err)
+ return err;
+ return count;
+}
+static DEVICE_ATTR_RW(error);
+
+static ssize_t textid_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ u32 text_id = 0;
+ int err;
+
+ err = visorchannel_read(chipset_dev->controlvm_channel,
+ offsetof(struct visor_controlvm_channel,
+ installation_text_id),
+ &text_id, sizeof(u32));
+ if (err)
+ return err;
+ return sprintf(buf, "%u\n", text_id);
+}
+
+static ssize_t textid_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ u32 text_id;
+ int err;
+
+ if (kstrtou32(buf, 10, &text_id))
+ return -EINVAL;
+ err = visorchannel_write(chipset_dev->controlvm_channel,
+ offsetof(struct visor_controlvm_channel,
+ installation_text_id),
+ &text_id, sizeof(u32));
+ if (err)
+ return err;
+ return count;
+}
+static DEVICE_ATTR_RW(textid);
+
+static ssize_t remaining_steps_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ u16 remaining_steps = 0;
+ int err;
+
+ err = visorchannel_read(chipset_dev->controlvm_channel,
+ offsetof(struct visor_controlvm_channel,
+ installation_remaining_steps),
+ &remaining_steps, sizeof(u16));
+ if (err)
+ return err;
+ return sprintf(buf, "%hu\n", remaining_steps);
+}
+
+static ssize_t remaining_steps_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ u16 remaining_steps;
+ int err;
+
+ if (kstrtou16(buf, 10, &remaining_steps))
+ return -EINVAL;
+ err = visorchannel_write(chipset_dev->controlvm_channel,
+ offsetof(struct visor_controlvm_channel,
+ installation_remaining_steps),
+ &remaining_steps, sizeof(u16));
+ if (err)
+ return err;
+ return count;
+}
+static DEVICE_ATTR_RW(remaining_steps);
+
+static void controlvm_init_response(struct controlvm_message *msg,
+ struct controlvm_message_header *msg_hdr,
+ int response)
+{
+ memset(msg, 0, sizeof(struct controlvm_message));
+ memcpy(&msg->hdr, msg_hdr, sizeof(struct controlvm_message_header));
+ msg->hdr.payload_bytes = 0;
+ msg->hdr.payload_vm_offset = 0;
+ msg->hdr.payload_max_bytes = 0;
+ if (response < 0) {
+ msg->hdr.flags.failed = 1;
+ msg->hdr.completion_status = (u32)(-response);
+ }
+}
+
+static int controlvm_respond_chipset_init(
+ struct controlvm_message_header *msg_hdr,
+ int response,
+ enum visor_chipset_feature features)
+{
+ struct controlvm_message outmsg;
+
+ controlvm_init_response(&outmsg, msg_hdr, response);
+ outmsg.cmd.init_chipset.features = features;
+ return visorchannel_signalinsert(chipset_dev->controlvm_channel,
+ CONTROLVM_QUEUE_REQUEST, &outmsg);
+}
+
+static int chipset_init(struct controlvm_message *inmsg)
+{
+ static int chipset_inited;
+ enum visor_chipset_feature features = 0;
+ int rc = CONTROLVM_RESP_SUCCESS;
+ int res = 0;
+
+ if (chipset_inited) {
+ rc = -CONTROLVM_RESP_ALREADY_DONE;
+ res = -EIO;
+ goto out_respond;
+ }
+ chipset_inited = 1;
+ /*
+ * Set features to indicate we support parahotplug (if Command also
+ * supports it). Set the "reply" bit so Command knows this is a
+ * features-aware driver.
+ */
+ features = inmsg->cmd.init_chipset.features &
+ VISOR_CHIPSET_FEATURE_PARA_HOTPLUG;
+ features |= VISOR_CHIPSET_FEATURE_REPLY;
+
+out_respond:
+ if (inmsg->hdr.flags.response_expected)
+ res = controlvm_respond_chipset_init(&inmsg->hdr, rc, features);
+
+ return res;
+}
+
+static int controlvm_respond(struct controlvm_message_header *msg_hdr,
+ int response, struct visor_segment_state *state)
+{
+ struct controlvm_message outmsg;
+
+ controlvm_init_response(&outmsg, msg_hdr, response);
+ if (outmsg.hdr.flags.test_message == 1)
+ return -EINVAL;
+ if (state) {
+ outmsg.cmd.device_change_state.state = *state;
+ outmsg.cmd.device_change_state.flags.phys_device = 1;
+ }
+ return visorchannel_signalinsert(chipset_dev->controlvm_channel,
+ CONTROLVM_QUEUE_REQUEST, &outmsg);
+}
+
+enum crash_obj_type {
+ CRASH_DEV,
+ CRASH_BUS,
+};
+
+static int save_crash_message(struct controlvm_message *msg,
+ enum crash_obj_type cr_type)
+{
+ u32 local_crash_msg_offset;
+ u16 local_crash_msg_count;
+ int err;
+
+ err = visorchannel_read(chipset_dev->controlvm_channel,
+ offsetof(struct visor_controlvm_channel,
+ saved_crash_message_count),
+ &local_crash_msg_count, sizeof(u16));
+ if (err) {
+ dev_err(&chipset_dev->acpi_device->dev,
+ "failed to read message count\n");
+ return err;
+ }
+ if (local_crash_msg_count != CONTROLVM_CRASHMSG_MAX) {
+ dev_err(&chipset_dev->acpi_device->dev,
+ "invalid number of messages\n");
+ return -EIO;
+ }
+ err = visorchannel_read(chipset_dev->controlvm_channel,
+ offsetof(struct visor_controlvm_channel,
+ saved_crash_message_offset),
+ &local_crash_msg_offset, sizeof(u32));
+ if (err) {
+ dev_err(&chipset_dev->acpi_device->dev,
+ "failed to read offset\n");
+ return err;
+ }
+ switch (cr_type) {
+ case CRASH_DEV:
+ local_crash_msg_offset += sizeof(struct controlvm_message);
+ err = visorchannel_write(chipset_dev->controlvm_channel,
+ local_crash_msg_offset, msg,
+ sizeof(struct controlvm_message));
+ if (err) {
+ dev_err(&chipset_dev->acpi_device->dev,
+ "failed to write dev msg\n");
+ return err;
+ }
+ break;
+ case CRASH_BUS:
+ err = visorchannel_write(chipset_dev->controlvm_channel,
+ local_crash_msg_offset, msg,
+ sizeof(struct controlvm_message));
+ if (err) {
+ dev_err(&chipset_dev->acpi_device->dev,
+ "failed to write bus msg\n");
+ return err;
+ }
+ break;
+ default:
+ dev_err(&chipset_dev->acpi_device->dev,
+ "Invalid crash_obj_type\n");
+ break;
+ }
+ return 0;
+}
+
+static int controlvm_responder(enum controlvm_id cmd_id,
+ struct controlvm_message_header *pending_msg_hdr,
+ int response)
+{
+ if (pending_msg_hdr->id != (u32)cmd_id)
+ return -EINVAL;
+
+ return controlvm_respond(pending_msg_hdr, response, NULL);
+}
+
+static int device_changestate_responder(enum controlvm_id cmd_id,
+ struct visor_device *p, int response,
+ struct visor_segment_state state)
+{
+ struct controlvm_message outmsg;
+
+ if (p->pending_msg_hdr->id != cmd_id)
+ return -EINVAL;
+
+ controlvm_init_response(&outmsg, p->pending_msg_hdr, response);
+ outmsg.cmd.device_change_state.bus_no = p->chipset_bus_no;
+ outmsg.cmd.device_change_state.dev_no = p->chipset_dev_no;
+ outmsg.cmd.device_change_state.state = state;
+ return visorchannel_signalinsert(chipset_dev->controlvm_channel,
+ CONTROLVM_QUEUE_REQUEST, &outmsg);
+}
+
+static int visorbus_create(struct controlvm_message *inmsg)
+{
+ struct controlvm_message_packet *cmd = &inmsg->cmd;
+ struct controlvm_message_header *pmsg_hdr;
+ u32 bus_no = cmd->create_bus.bus_no;
+ struct visor_device *bus_info;
+ struct visorchannel *visorchannel;
+ int err;
+
+ bus_info = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL);
+ if (bus_info && bus_info->state.created == 1) {
+ dev_err(&chipset_dev->acpi_device->dev,
+ "failed %s: already exists\n", __func__);
+ err = -EEXIST;
+ goto err_respond;
+ }
+ bus_info = kzalloc(sizeof(*bus_info), GFP_KERNEL);
+ if (!bus_info) {
+ err = -ENOMEM;
+ goto err_respond;
+ }
+ INIT_LIST_HEAD(&bus_info->list_all);
+ bus_info->chipset_bus_no = bus_no;
+ bus_info->chipset_dev_no = BUS_ROOT_DEVICE;
+ if (guid_equal(&cmd->create_bus.bus_inst_guid, &visor_siovm_guid)) {
+ err = save_crash_message(inmsg, CRASH_BUS);
+ if (err)
+ goto err_free_bus_info;
+ }
+ if (inmsg->hdr.flags.response_expected == 1) {
+ pmsg_hdr = kzalloc(sizeof(*pmsg_hdr), GFP_KERNEL);
+ if (!pmsg_hdr) {
+ err = -ENOMEM;
+ goto err_free_bus_info;
+ }
+ memcpy(pmsg_hdr, &inmsg->hdr,
+ sizeof(struct controlvm_message_header));
+ bus_info->pending_msg_hdr = pmsg_hdr;
+ }
+ visorchannel = visorchannel_create(cmd->create_bus.channel_addr,
+ GFP_KERNEL,
+ &cmd->create_bus.bus_data_type_guid,
+ false);
+ if (!visorchannel) {
+ err = -ENOMEM;
+ goto err_free_pending_msg;
+ }
+ bus_info->visorchannel = visorchannel;
+ /* Response will be handled by visorbus_create_instance on success */
+ err = visorbus_create_instance(bus_info);
+ if (err)
+ goto err_destroy_channel;
+ return 0;
+
+err_destroy_channel:
+ visorchannel_destroy(visorchannel);
+
+err_free_pending_msg:
+ kfree(bus_info->pending_msg_hdr);
+
+err_free_bus_info:
+ kfree(bus_info);
+
+err_respond:
+ if (inmsg->hdr.flags.response_expected == 1)
+ controlvm_responder(inmsg->hdr.id, &inmsg->hdr, err);
+ return err;
+}
+
+static int visorbus_destroy(struct controlvm_message *inmsg)
+{
+ struct controlvm_message_header *pmsg_hdr;
+ u32 bus_no = inmsg->cmd.destroy_bus.bus_no;
+ struct visor_device *bus_info;
+ int err;
+
+ bus_info = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL);
+ if (!bus_info) {
+ err = -ENODEV;
+ goto err_respond;
+ }
+ if (bus_info->state.created == 0) {
+ err = -ENOENT;
+ goto err_respond;
+ }
+ if (bus_info->pending_msg_hdr) {
+ /* only non-NULL if dev is still waiting on a response */
+ err = -EEXIST;
+ goto err_respond;
+ }
+ if (inmsg->hdr.flags.response_expected == 1) {
+ pmsg_hdr = kzalloc(sizeof(*pmsg_hdr), GFP_KERNEL);
+ if (!pmsg_hdr) {
+ err = -ENOMEM;
+ goto err_respond;
+ }
+ memcpy(pmsg_hdr, &inmsg->hdr,
+ sizeof(struct controlvm_message_header));
+ bus_info->pending_msg_hdr = pmsg_hdr;
+ }
+ /* Response will be handled by visorbus_remove_instance */
+ visorbus_remove_instance(bus_info);
+ return 0;
+
+err_respond:
+ if (inmsg->hdr.flags.response_expected == 1)
+ controlvm_responder(inmsg->hdr.id, &inmsg->hdr, err);
+ return err;
+}
+
+static const guid_t *parser_id_get(struct parser_context *ctx)
+{
+ return &ctx->data.id;
+}
+
+static void *parser_string_get(u8 *pscan, int nscan)
+{
+ int value_length;
+ void *value;
+
+ if (nscan == 0)
+ return NULL;
+
+ value_length = strnlen(pscan, nscan);
+ value = kzalloc(value_length + 1, GFP_KERNEL);
+ if (!value)
+ return NULL;
+ if (value_length > 0)
+ memcpy(value, pscan, value_length);
+ return value;
+}
+
+static void *parser_name_get(struct parser_context *ctx)
+{
+ struct visor_controlvm_parameters_header *phdr;
+
+ phdr = &ctx->data;
+ if ((unsigned long)phdr->name_offset +
+ (unsigned long)phdr->name_length > ctx->param_bytes)
+ return NULL;
+ ctx->curr = (char *)&phdr + phdr->name_offset;
+ ctx->bytes_remaining = phdr->name_length;
+ return parser_string_get(ctx->curr, phdr->name_length);
+}
+
+static int visorbus_configure(struct controlvm_message *inmsg,
+ struct parser_context *parser_ctx)
+{
+ struct controlvm_message_packet *cmd = &inmsg->cmd;
+ u32 bus_no;
+ struct visor_device *bus_info;
+ int err = 0;
+
+ bus_no = cmd->configure_bus.bus_no;
+ bus_info = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL);
+ if (!bus_info) {
+ err = -EINVAL;
+ goto err_respond;
+ }
+ if (bus_info->state.created == 0) {
+ err = -EINVAL;
+ goto err_respond;
+ }
+ if (bus_info->pending_msg_hdr) {
+ err = -EIO;
+ goto err_respond;
+ }
+ err = visorchannel_set_clientpartition(bus_info->visorchannel,
+ cmd->configure_bus.guest_handle);
+ if (err)
+ goto err_respond;
+ if (parser_ctx) {
+ const guid_t *partition_guid = parser_id_get(parser_ctx);
+
+ guid_copy(&bus_info->partition_guid, partition_guid);
+ bus_info->name = parser_name_get(parser_ctx);
+ }
+ if (inmsg->hdr.flags.response_expected == 1)
+ controlvm_responder(inmsg->hdr.id, &inmsg->hdr, err);
+ return 0;
+
+err_respond:
+ dev_err(&chipset_dev->acpi_device->dev,
+ "%s exited with err: %d\n", __func__, err);
+ if (inmsg->hdr.flags.response_expected == 1)
+ controlvm_responder(inmsg->hdr.id, &inmsg->hdr, err);
+ return err;
+}
+
+static int visorbus_device_create(struct controlvm_message *inmsg)
+{
+ struct controlvm_message_packet *cmd = &inmsg->cmd;
+ struct controlvm_message_header *pmsg_hdr;
+ u32 bus_no = cmd->create_device.bus_no;
+ u32 dev_no = cmd->create_device.dev_no;
+ struct visor_device *dev_info;
+ struct visor_device *bus_info;
+ struct visorchannel *visorchannel;
+ int err;
+
+ bus_info = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL);
+ if (!bus_info) {
+ dev_err(&chipset_dev->acpi_device->dev,
+ "failed to get bus by id: %d\n", bus_no);
+ err = -ENODEV;
+ goto err_respond;
+ }
+ if (bus_info->state.created == 0) {
+ dev_err(&chipset_dev->acpi_device->dev,
+ "bus not created, id: %d\n", bus_no);
+ err = -EINVAL;
+ goto err_respond;
+ }
+ dev_info = visorbus_get_device_by_id(bus_no, dev_no, NULL);
+ if (dev_info && dev_info->state.created == 1) {
+ dev_err(&chipset_dev->acpi_device->dev,
+ "failed to get bus by id: %d/%d\n", bus_no, dev_no);
+ err = -EEXIST;
+ goto err_respond;
+ }
+
+ dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL);
+ if (!dev_info) {
+ err = -ENOMEM;
+ goto err_respond;
+ }
+ dev_info->chipset_bus_no = bus_no;
+ dev_info->chipset_dev_no = dev_no;
+ guid_copy(&dev_info->inst, &cmd->create_device.dev_inst_guid);
+ dev_info->device.parent = &bus_info->device;
+ visorchannel = visorchannel_create(cmd->create_device.channel_addr,
+ GFP_KERNEL,
+ &cmd->create_device.data_type_guid,
+ true);
+ if (!visorchannel) {
+ dev_err(&chipset_dev->acpi_device->dev,
+ "failed to create visorchannel: %d/%d\n",
+ bus_no, dev_no);
+ err = -ENOMEM;
+ goto err_free_dev_info;
+ }
+ dev_info->visorchannel = visorchannel;
+ guid_copy(&dev_info->channel_type_guid,
+ &cmd->create_device.data_type_guid);
+ if (guid_equal(&cmd->create_device.data_type_guid,
+ &visor_vhba_channel_guid)) {
+ err = save_crash_message(inmsg, CRASH_DEV);
+ if (err)
+ goto err_destroy_visorchannel;
+ }
+ if (inmsg->hdr.flags.response_expected == 1) {
+ pmsg_hdr = kzalloc(sizeof(*pmsg_hdr), GFP_KERNEL);
+ if (!pmsg_hdr) {
+ err = -ENOMEM;
+ goto err_destroy_visorchannel;
+ }
+ memcpy(pmsg_hdr, &inmsg->hdr,
+ sizeof(struct controlvm_message_header));
+ dev_info->pending_msg_hdr = pmsg_hdr;
+ }
+ /* create_visor_device will send response */
+ err = create_visor_device(dev_info);
+ if (err)
+ goto err_destroy_visorchannel;
+
+ return 0;
+
+err_destroy_visorchannel:
+ visorchannel_destroy(visorchannel);
+
+err_free_dev_info:
+ kfree(dev_info);
+
+err_respond:
+ if (inmsg->hdr.flags.response_expected == 1)
+ controlvm_responder(inmsg->hdr.id, &inmsg->hdr, err);
+ return err;
+}
+
+static int visorbus_device_changestate(struct controlvm_message *inmsg)
+{
+ struct controlvm_message_packet *cmd = &inmsg->cmd;
+ struct controlvm_message_header *pmsg_hdr;
+ u32 bus_no = cmd->device_change_state.bus_no;
+ u32 dev_no = cmd->device_change_state.dev_no;
+ struct visor_segment_state state = cmd->device_change_state.state;
+ struct visor_device *dev_info;
+ int err = 0;
+
+ dev_info = visorbus_get_device_by_id(bus_no, dev_no, NULL);
+ if (!dev_info) {
+ err = -ENODEV;
+ goto err_respond;
+ }
+ if (dev_info->state.created == 0) {
+ err = -EINVAL;
+ goto err_respond;
+ }
+ if (dev_info->pending_msg_hdr) {
+ /* only non-NULL if dev is still waiting on a response */
+ err = -EIO;
+ goto err_respond;
+ }
+
+ if (inmsg->hdr.flags.response_expected == 1) {
+ pmsg_hdr = kzalloc(sizeof(*pmsg_hdr), GFP_KERNEL);
+ if (!pmsg_hdr) {
+ err = -ENOMEM;
+ goto err_respond;
+ }
+ memcpy(pmsg_hdr, &inmsg->hdr,
+ sizeof(struct controlvm_message_header));
+ dev_info->pending_msg_hdr = pmsg_hdr;
+ }
+ if (state.alive == segment_state_running.alive &&
+ state.operating == segment_state_running.operating)
+ /* Response will be sent from visorchipset_device_resume */
+ err = visorchipset_device_resume(dev_info);
+ /* ServerNotReady / ServerLost / SegmentStateStandby */
+ else if (state.alive == segment_state_standby.alive &&
+ state.operating == segment_state_standby.operating)
+ /*
+ * technically this is standby case where server is lost.
+ * Response will be sent from visorchipset_device_pause.
+ */
+ err = visorchipset_device_pause(dev_info);
+ if (err)
+ goto err_respond;
+ return 0;
+
+err_respond:
+ dev_err(&chipset_dev->acpi_device->dev, "failed: %d\n", err);
+ if (inmsg->hdr.flags.response_expected == 1)
+ controlvm_responder(inmsg->hdr.id, &inmsg->hdr, err);
+ return err;
+}
+
+static int visorbus_device_destroy(struct controlvm_message *inmsg)
+{
+ struct controlvm_message_packet *cmd = &inmsg->cmd;
+ struct controlvm_message_header *pmsg_hdr;
+ u32 bus_no = cmd->destroy_device.bus_no;
+ u32 dev_no = cmd->destroy_device.dev_no;
+ struct visor_device *dev_info;
+ int err;
+
+ dev_info = visorbus_get_device_by_id(bus_no, dev_no, NULL);
+ if (!dev_info) {
+ err = -ENODEV;
+ goto err_respond;
+ }
+ if (dev_info->state.created == 0) {
+ err = -EINVAL;
+ goto err_respond;
+ }
+ if (dev_info->pending_msg_hdr) {
+ /* only non-NULL if dev is still waiting on a response */
+ err = -EIO;
+ goto err_respond;
+ }
+ if (inmsg->hdr.flags.response_expected == 1) {
+ pmsg_hdr = kzalloc(sizeof(*pmsg_hdr), GFP_KERNEL);
+ if (!pmsg_hdr) {
+ err = -ENOMEM;
+ goto err_respond;
+ }
+
+ memcpy(pmsg_hdr, &inmsg->hdr,
+ sizeof(struct controlvm_message_header));
+ dev_info->pending_msg_hdr = pmsg_hdr;
+ }
+ kfree(dev_info->name);
+ remove_visor_device(dev_info);
+ return 0;
+
+err_respond:
+ if (inmsg->hdr.flags.response_expected == 1)
+ controlvm_responder(inmsg->hdr.id, &inmsg->hdr, err);
+ return err;
+}
+
+/*
+ * The general parahotplug flow works as follows. The visorchipset receives
+ * a DEVICE_CHANGESTATE message from Command specifying a physical device
+ * to enable or disable. The CONTROLVM message handler calls
+ * parahotplug_process_message, which then adds the message to a global list
+ * and kicks off a udev event which causes a user level script to enable or
+ * disable the specified device. The udev script then writes to
+ * /sys/devices/platform/visorchipset/parahotplug, which causes the
+ * parahotplug store functions to get called, at which point the
+ * appropriate CONTROLVM message is retrieved from the list and responded to.
+ */
+
+#define PARAHOTPLUG_TIMEOUT_MS 2000
+
+/*
+ * parahotplug_next_id() - generate unique int to match an outstanding
+ * CONTROLVM message with a udev script /sys
+ * response
+ *
+ * Return: a unique integer value
+ */
+static int parahotplug_next_id(void)
+{
+ static atomic_t id = ATOMIC_INIT(0);
+
+ return atomic_inc_return(&id);
+}
+
+/*
+ * parahotplug_next_expiration() - returns the time (in jiffies) when a
+ * CONTROLVM message on the list should expire
+ * -- PARAHOTPLUG_TIMEOUT_MS in the future
+ *
+ * Return: expected expiration time (in jiffies)
+ */
+static unsigned long parahotplug_next_expiration(void)
+{
+ return jiffies + msecs_to_jiffies(PARAHOTPLUG_TIMEOUT_MS);
+}
+
+/*
+ * parahotplug_request_create() - create a parahotplug_request, which is
+ * basically a wrapper for a CONTROLVM_MESSAGE
+ * that we can stick on a list
+ * @msg: the message to insert in the request
+ *
+ * Return: the request containing the provided message
+ */
+static struct parahotplug_request *parahotplug_request_create(
+ struct controlvm_message *msg)
+{
+ struct parahotplug_request *req;
+
+ req = kmalloc(sizeof(*req), GFP_KERNEL);
+ if (!req)
+ return NULL;
+ req->id = parahotplug_next_id();
+ req->expiration = parahotplug_next_expiration();
+ req->msg = *msg;
+ return req;
+}
+
+/*
+ * parahotplug_request_destroy() - free a parahotplug_request
+ * @req: the request to deallocate
+ */
+static void parahotplug_request_destroy(struct parahotplug_request *req)
+{
+ kfree(req);
+}
+
+static LIST_HEAD(parahotplug_request_list);
+/* lock for above */
+static DEFINE_SPINLOCK(parahotplug_request_list_lock);
+
+/*
+ * parahotplug_request_complete() - mark request as complete
+ * @id: the id of the request
+ * @active: indicates whether the request is assigned to active partition
+ *
+ * Called from the /sys handler, which means the user script has
+ * finished the enable/disable. Find the matching identifier, and
+ * respond to the CONTROLVM message with success.
+ *
+ * Return: 0 on success or -EINVAL on failure
+ */
+static int parahotplug_request_complete(int id, u16 active)
+{
+ struct list_head *pos;
+ struct list_head *tmp;
+ struct parahotplug_request *req;
+
+ spin_lock(&parahotplug_request_list_lock);
+ /* Look for a request matching "id". */
+ list_for_each_safe(pos, tmp, &parahotplug_request_list) {
+ req = list_entry(pos, struct parahotplug_request, list);
+ if (req->id == id) {
+ /*
+ * Found a match. Remove it from the list and
+ * respond.
+ */
+ list_del(pos);
+ spin_unlock(&parahotplug_request_list_lock);
+ req->msg.cmd.device_change_state.state.active = active;
+ if (req->msg.hdr.flags.response_expected)
+ controlvm_respond(
+ &req->msg.hdr, CONTROLVM_RESP_SUCCESS,
+ &req->msg.cmd.device_change_state.state);
+ parahotplug_request_destroy(req);
+ return 0;
+ }
+ }
+ spin_unlock(&parahotplug_request_list_lock);
+ return -EINVAL;
+}
+
+/*
+ * devicedisabled_store() - disables the hotplug device
+ * @dev: sysfs interface variable not utilized in this function
+ * @attr: sysfs interface variable not utilized in this function
+ * @buf: buffer containing the device id
+ * @count: the size of the buffer
+ *
+ * The parahotplug/devicedisabled interface gets called by our support script
+ * when an SR-IOV device has been shut down. The ID is passed to the script
+ * and then passed back when the device has been removed.
+ *
+ * Return: the size of the buffer for success or negative for error
+ */
+static ssize_t devicedisabled_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned int id;
+ int err;
+
+ if (kstrtouint(buf, 10, &id))
+ return -EINVAL;
+ err = parahotplug_request_complete(id, 0);
+ if (err < 0)
+ return err;
+ return count;
+}
+static DEVICE_ATTR_WO(devicedisabled);
+
+/*
+ * deviceenabled_store() - enables the hotplug device
+ * @dev: sysfs interface variable not utilized in this function
+ * @attr: sysfs interface variable not utilized in this function
+ * @buf: buffer containing the device id
+ * @count: the size of the buffer
+ *
+ * The parahotplug/deviceenabled interface gets called by our support script
+ * when an SR-IOV device has been recovered. The ID is passed to the script
+ * and then passed back when the device has been brought back up.
+ *
+ * Return: the size of the buffer for success or negative for error
+ */
+static ssize_t deviceenabled_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned int id;
+
+ if (kstrtouint(buf, 10, &id))
+ return -EINVAL;
+ parahotplug_request_complete(id, 1);
+ return count;
+}
+static DEVICE_ATTR_WO(deviceenabled);
+
+static struct attribute *visorchipset_install_attrs[] = {
+ &dev_attr_toolaction.attr,
+ &dev_attr_boottotool.attr,
+ &dev_attr_error.attr,
+ &dev_attr_textid.attr,
+ &dev_attr_remaining_steps.attr,
+ NULL
+};
+
+static const struct attribute_group visorchipset_install_group = {
+ .name = "install",
+ .attrs = visorchipset_install_attrs
+};
+
+static struct attribute *visorchipset_parahotplug_attrs[] = {
+ &dev_attr_devicedisabled.attr,
+ &dev_attr_deviceenabled.attr,
+ NULL
+};
+
+static const struct attribute_group visorchipset_parahotplug_group = {
+ .name = "parahotplug",
+ .attrs = visorchipset_parahotplug_attrs
+};
+
+static const struct attribute_group *visorchipset_dev_groups[] = {
+ &visorchipset_install_group,
+ &visorchipset_parahotplug_group,
+ NULL
+};
+
+/*
+ * parahotplug_request_kickoff() - initiate parahotplug request
+ * @req: the request to initiate
+ *
+ * Cause uevent to run the user level script to do the disable/enable specified
+ * in the parahotplug_request.
+ */
+static int parahotplug_request_kickoff(struct parahotplug_request *req)
+{
+ struct controlvm_message_packet *cmd = &req->msg.cmd;
+ char env_cmd[40], env_id[40], env_state[40], env_bus[40], env_dev[40],
+ env_func[40];
+ char *envp[] = { env_cmd, env_id, env_state, env_bus, env_dev,
+ env_func, NULL
+ };
+
+ sprintf(env_cmd, "VISOR_PARAHOTPLUG=1");
+ sprintf(env_id, "VISOR_PARAHOTPLUG_ID=%d", req->id);
+ sprintf(env_state, "VISOR_PARAHOTPLUG_STATE=%d",
+ cmd->device_change_state.state.active);
+ sprintf(env_bus, "VISOR_PARAHOTPLUG_BUS=%d",
+ cmd->device_change_state.bus_no);
+ sprintf(env_dev, "VISOR_PARAHOTPLUG_DEVICE=%d",
+ cmd->device_change_state.dev_no >> 3);
+ sprintf(env_func, "VISOR_PARAHOTPLUG_FUNCTION=%d",
+ cmd->device_change_state.dev_no & 0x7);
+ return kobject_uevent_env(&chipset_dev->acpi_device->dev.kobj,
+ KOBJ_CHANGE, envp);
+}
+
+/*
+ * parahotplug_process_message() - enables or disables a PCI device by kicking
+ * off a udev script
+ * @inmsg: the message indicating whether to enable or disable
+ */
+static int parahotplug_process_message(struct controlvm_message *inmsg)
+{
+ struct parahotplug_request *req;
+ int err;
+
+ req = parahotplug_request_create(inmsg);
+ if (!req)
+ return -ENOMEM;
+ /*
+ * For enable messages, just respond with success right away, we don't
+ * need to wait to see if the enable was successful.
+ */
+ if (inmsg->cmd.device_change_state.state.active) {
+ err = parahotplug_request_kickoff(req);
+ if (err)
+ goto err_respond;
+ controlvm_respond(&inmsg->hdr, CONTROLVM_RESP_SUCCESS,
+ &inmsg->cmd.device_change_state.state);
+ parahotplug_request_destroy(req);
+ return 0;
+ }
+ /*
+ * For disable messages, add the request to the request list before
+ * kicking off the udev script. It won't get responded to until the
+ * script has indicated it's done.
+ */
+ spin_lock(&parahotplug_request_list_lock);
+ list_add_tail(&req->list, &parahotplug_request_list);
+ spin_unlock(&parahotplug_request_list_lock);
+ err = parahotplug_request_kickoff(req);
+ if (err)
+ goto err_respond;
+ return 0;
+
+err_respond:
+ controlvm_respond(&inmsg->hdr, err,
+ &inmsg->cmd.device_change_state.state);
+ return err;
+}
+
+/*
+ * chipset_ready_uevent() - sends chipset_ready action
+ *
+ * Send ACTION=online for DEVPATH=/sys/devices/platform/visorchipset.
+ *
+ * Return: 0 on success, negative on failure
+ */
+static int chipset_ready_uevent(struct controlvm_message_header *msg_hdr)
+{
+ int res;
+
+ res = kobject_uevent(&chipset_dev->acpi_device->dev.kobj, KOBJ_ONLINE);
+ if (msg_hdr->flags.response_expected)
+ controlvm_respond(msg_hdr, res, NULL);
+ return res;
+}
+
+/*
+ * chipset_selftest_uevent() - sends chipset_selftest action
+ *
+ * Send ACTION=online for DEVPATH=/sys/devices/platform/visorchipset.
+ *
+ * Return: 0 on success, negative on failure
+ */
+static int chipset_selftest_uevent(struct controlvm_message_header *msg_hdr)
+{
+ char env_selftest[20];
+ char *envp[] = { env_selftest, NULL };
+ int res;
+
+ sprintf(env_selftest, "SPARSP_SELFTEST=%d", 1);
+ res = kobject_uevent_env(&chipset_dev->acpi_device->dev.kobj,
+ KOBJ_CHANGE, envp);
+ if (msg_hdr->flags.response_expected)
+ controlvm_respond(msg_hdr, res, NULL);
+ return res;
+}
+
+/*
+ * chipset_notready_uevent() - sends chipset_notready action
+ *
+ * Send ACTION=offline for DEVPATH=/sys/devices/platform/visorchipset.
+ *
+ * Return: 0 on success, negative on failure
+ */
+static int chipset_notready_uevent(struct controlvm_message_header *msg_hdr)
+{
+ int res = kobject_uevent(&chipset_dev->acpi_device->dev.kobj,
+ KOBJ_OFFLINE);
+
+ if (msg_hdr->flags.response_expected)
+ controlvm_respond(msg_hdr, res, NULL);
+ return res;
+}
+
+static int unisys_vmcall(unsigned long tuple, unsigned long param)
+{
+ int result = 0;
+ unsigned int cpuid_eax, cpuid_ebx, cpuid_ecx, cpuid_edx;
+ unsigned long reg_ebx;
+ unsigned long reg_ecx;
+
+ reg_ebx = param & 0xFFFFFFFF;
+ reg_ecx = param >> 32;
+ cpuid(0x00000001, &cpuid_eax, &cpuid_ebx, &cpuid_ecx, &cpuid_edx);
+ if (!(cpuid_ecx & 0x80000000))
+ return -EPERM;
+ __asm__ __volatile__(".byte 0x00f, 0x001, 0x0c1" : "=a"(result) :
+ "a"(tuple), "b"(reg_ebx), "c"(reg_ecx));
+ if (result)
+ goto error;
+ return 0;
+
+/* Need to convert from VMCALL error codes to Linux */
+error:
+ switch (result) {
+ case VMCALL_RESULT_INVALID_PARAM:
+ return -EINVAL;
+ case VMCALL_RESULT_DATA_UNAVAILABLE:
+ return -ENODEV;
+ default:
+ return -EFAULT;
+ }
+}
+
+static int controlvm_channel_create(struct visorchipset_device *dev)
+{
+ struct visorchannel *chan;
+ u64 addr;
+ int err;
+
+ err = unisys_vmcall(VMCALL_CONTROLVM_ADDR,
+ virt_to_phys(&dev->controlvm_params));
+ if (err)
+ return err;
+ addr = dev->controlvm_params.address;
+ chan = visorchannel_create(addr, GFP_KERNEL,
+ &visor_controlvm_channel_guid, true);
+ if (!chan)
+ return -ENOMEM;
+ dev->controlvm_channel = chan;
+ return 0;
+}
+
+static void setup_crash_devices_work_queue(struct work_struct *work)
+{
+ struct controlvm_message local_crash_bus_msg;
+ struct controlvm_message local_crash_dev_msg;
+ struct controlvm_message msg;
+ u32 local_crash_msg_offset;
+ u16 local_crash_msg_count;
+
+ /* send init chipset msg */
+ msg.hdr.id = CONTROLVM_CHIPSET_INIT;
+ msg.cmd.init_chipset.bus_count = 23;
+ msg.cmd.init_chipset.switch_count = 0;
+ chipset_init(&msg);
+ /* get saved message count */
+ if (visorchannel_read(chipset_dev->controlvm_channel,
+ offsetof(struct visor_controlvm_channel,
+ saved_crash_message_count),
+ &local_crash_msg_count, sizeof(u16)) < 0) {
+ dev_err(&chipset_dev->acpi_device->dev,
+ "failed to read channel\n");
+ return;
+ }
+ if (local_crash_msg_count != CONTROLVM_CRASHMSG_MAX) {
+ dev_err(&chipset_dev->acpi_device->dev, "invalid count\n");
+ return;
+ }
+ /* get saved crash message offset */
+ if (visorchannel_read(chipset_dev->controlvm_channel,
+ offsetof(struct visor_controlvm_channel,
+ saved_crash_message_offset),
+ &local_crash_msg_offset, sizeof(u32)) < 0) {
+ dev_err(&chipset_dev->acpi_device->dev,
+ "failed to read channel\n");
+ return;
+ }
+ /* read create device message for storage bus offset */
+ if (visorchannel_read(chipset_dev->controlvm_channel,
+ local_crash_msg_offset,
+ &local_crash_bus_msg,
+ sizeof(struct controlvm_message)) < 0) {
+ dev_err(&chipset_dev->acpi_device->dev,
+ "failed to read channel\n");
+ return;
+ }
+ /* read create device message for storage device */
+ if (visorchannel_read(chipset_dev->controlvm_channel,
+ local_crash_msg_offset +
+ sizeof(struct controlvm_message),
+ &local_crash_dev_msg,
+ sizeof(struct controlvm_message)) < 0) {
+ dev_err(&chipset_dev->acpi_device->dev,
+ "failed to read channel\n");
+ return;
+ }
+ /* reuse IOVM create bus message */
+ if (!local_crash_bus_msg.cmd.create_bus.channel_addr) {
+ dev_err(&chipset_dev->acpi_device->dev,
+ "no valid create_bus message\n");
+ return;
+ }
+ visorbus_create(&local_crash_bus_msg);
+ /* reuse create device message for storage device */
+ if (!local_crash_dev_msg.cmd.create_device.channel_addr) {
+ dev_err(&chipset_dev->acpi_device->dev,
+ "no valid create_device message\n");
+ return;
+ }
+ visorbus_device_create(&local_crash_dev_msg);
+}
+
+void visorbus_response(struct visor_device *bus_info, int response,
+ int controlvm_id)
+{
+ if (!bus_info->pending_msg_hdr)
+ return;
+
+ controlvm_responder(controlvm_id, bus_info->pending_msg_hdr, response);
+ kfree(bus_info->pending_msg_hdr);
+ bus_info->pending_msg_hdr = NULL;
+}
+
+void visorbus_device_changestate_response(struct visor_device *dev_info,
+ int response,
+ struct visor_segment_state state)
+{
+ if (!dev_info->pending_msg_hdr)
+ return;
+
+ device_changestate_responder(CONTROLVM_DEVICE_CHANGESTATE, dev_info,
+ response, state);
+ kfree(dev_info->pending_msg_hdr);
+ dev_info->pending_msg_hdr = NULL;
+}
+
+static void parser_done(struct parser_context *ctx)
+{
+ chipset_dev->controlvm_payload_bytes_buffered -= ctx->param_bytes;
+ kfree(ctx);
+}
+
+static struct parser_context *parser_init_stream(u64 addr, u32 bytes,
+ bool *retry)
+{
+ unsigned long allocbytes;
+ struct parser_context *ctx;
+ void *mapping;
+
+ *retry = false;
+ /* alloc an extra byte to ensure payload is \0 terminated */
+ allocbytes = (unsigned long)bytes + 1 + (sizeof(struct parser_context) -
+ sizeof(struct visor_controlvm_parameters_header));
+ if ((chipset_dev->controlvm_payload_bytes_buffered + bytes) >
+ MAX_CONTROLVM_PAYLOAD_BYTES) {
+ *retry = true;
+ return NULL;
+ }
+ ctx = kzalloc(allocbytes, GFP_KERNEL);
+ if (!ctx) {
+ *retry = true;
+ return NULL;
+ }
+ ctx->allocbytes = allocbytes;
+ ctx->param_bytes = bytes;
+ mapping = memremap(addr, bytes, MEMREMAP_WB);
+ if (!mapping)
+ goto err_finish_ctx;
+ memcpy(&ctx->data, mapping, bytes);
+ memunmap(mapping);
+ ctx->byte_stream = true;
+ chipset_dev->controlvm_payload_bytes_buffered += ctx->param_bytes;
+ return ctx;
+
+err_finish_ctx:
+ kfree(ctx);
+ return NULL;
+}
+
+/*
+ * handle_command() - process a controlvm message
+ * @inmsg: the message to process
+ * @channel_addr: address of the controlvm channel
+ *
+ * Return:
+ * 0 - Successfully processed the message
+ * -EAGAIN - ControlVM message was not processed and should be retried
+ * reading the next controlvm message; a scenario where this can
+ * occur is when we need to throttle the allocation of memory in
+ * which to copy out controlvm payload data.
+ * < 0 - error: ControlVM message was processed but an error occurred.
+ */
+static int handle_command(struct controlvm_message inmsg, u64 channel_addr)
+{
+ struct controlvm_message_packet *cmd = &inmsg.cmd;
+ u64 parm_addr;
+ u32 parm_bytes;
+ struct parser_context *parser_ctx = NULL;
+ struct controlvm_message ackmsg;
+ int err = 0;
+
+ /* create parsing context if necessary */
+ parm_addr = channel_addr + inmsg.hdr.payload_vm_offset;
+ parm_bytes = inmsg.hdr.payload_bytes;
+ /*
+ * Parameter and channel addresses within test messages actually lie
+ * within our OS-controlled memory. We need to know that, because it
+ * makes a difference in how we compute the virtual address.
+ */
+ if (parm_bytes) {
+ bool retry;
+
+ parser_ctx = parser_init_stream(parm_addr, parm_bytes, &retry);
+ if (!parser_ctx && retry)
+ return -EAGAIN;
+ }
+ controlvm_init_response(&ackmsg, &inmsg.hdr, CONTROLVM_RESP_SUCCESS);
+ err = visorchannel_signalinsert(chipset_dev->controlvm_channel,
+ CONTROLVM_QUEUE_ACK, &ackmsg);
+ if (err)
+ return err;
+ switch (inmsg.hdr.id) {
+ case CONTROLVM_CHIPSET_INIT:
+ err = chipset_init(&inmsg);
+ break;
+ case CONTROLVM_BUS_CREATE:
+ err = visorbus_create(&inmsg);
+ break;
+ case CONTROLVM_BUS_DESTROY:
+ err = visorbus_destroy(&inmsg);
+ break;
+ case CONTROLVM_BUS_CONFIGURE:
+ err = visorbus_configure(&inmsg, parser_ctx);
+ break;
+ case CONTROLVM_DEVICE_CREATE:
+ err = visorbus_device_create(&inmsg);
+ break;
+ case CONTROLVM_DEVICE_CHANGESTATE:
+ if (cmd->device_change_state.flags.phys_device) {
+ err = parahotplug_process_message(&inmsg);
+ } else {
+ /*
+ * save the hdr and cmd structures for later use when
+ * sending back the response to Command
+ */
+ err = visorbus_device_changestate(&inmsg);
+ break;
+ }
+ break;
+ case CONTROLVM_DEVICE_DESTROY:
+ err = visorbus_device_destroy(&inmsg);
+ break;
+ case CONTROLVM_DEVICE_CONFIGURE:
+ /* no op just send a respond that we passed */
+ if (inmsg.hdr.flags.response_expected)
+ controlvm_respond(&inmsg.hdr, CONTROLVM_RESP_SUCCESS,
+ NULL);
+ break;
+ case CONTROLVM_CHIPSET_READY:
+ err = chipset_ready_uevent(&inmsg.hdr);
+ break;
+ case CONTROLVM_CHIPSET_SELFTEST:
+ err = chipset_selftest_uevent(&inmsg.hdr);
+ break;
+ case CONTROLVM_CHIPSET_STOP:
+ err = chipset_notready_uevent(&inmsg.hdr);
+ break;
+ default:
+ err = -ENOMSG;
+ if (inmsg.hdr.flags.response_expected)
+ controlvm_respond(&inmsg.hdr,
+ -CONTROLVM_RESP_ID_UNKNOWN, NULL);
+ break;
+ }
+ if (parser_ctx) {
+ parser_done(parser_ctx);
+ parser_ctx = NULL;
+ }
+ return err;
+}
+
+/*
+ * read_controlvm_event() - retreives the next message from the
+ * CONTROLVM_QUEUE_EVENT queue in the controlvm
+ * channel
+ * @msg: pointer to the retrieved message
+ *
+ * Return: 0 if valid message was retrieved or -error
+ */
+static int read_controlvm_event(struct controlvm_message *msg)
+{
+ int err = visorchannel_signalremove(chipset_dev->controlvm_channel,
+ CONTROLVM_QUEUE_EVENT, msg);
+
+ if (err)
+ return err;
+ /* got a message */
+ if (msg->hdr.flags.test_message == 1)
+ return -EINVAL;
+ return 0;
+}
+
+/*
+ * parahotplug_process_list() - remove any request from the list that's been on
+ * there too long and respond with an error
+ */
+static void parahotplug_process_list(void)
+{
+ struct list_head *pos;
+ struct list_head *tmp;
+
+ spin_lock(&parahotplug_request_list_lock);
+ list_for_each_safe(pos, tmp, &parahotplug_request_list) {
+ struct parahotplug_request *req =
+ list_entry(pos, struct parahotplug_request, list);
+
+ if (!time_after_eq(jiffies, req->expiration))
+ continue;
+ list_del(pos);
+ if (req->msg.hdr.flags.response_expected)
+ controlvm_respond(
+ &req->msg.hdr,
+ CONTROLVM_RESP_DEVICE_UDEV_TIMEOUT,
+ &req->msg.cmd.device_change_state.state);
+ parahotplug_request_destroy(req);
+ }
+ spin_unlock(&parahotplug_request_list_lock);
+}
+
+static void controlvm_periodic_work(struct work_struct *work)
+{
+ struct controlvm_message inmsg;
+ int count = 0;
+ int err;
+
+ /* Drain the RESPONSE queue make it empty */
+ do {
+ err = visorchannel_signalremove(chipset_dev->controlvm_channel,
+ CONTROLVM_QUEUE_RESPONSE,
+ &inmsg);
+ } while ((!err) && (++count < CONTROLVM_MESSAGE_MAX));
+ if (err != -EAGAIN)
+ goto schedule_out;
+ if (chipset_dev->controlvm_pending_msg_valid) {
+ /*
+ * we throttled processing of a prior msg, so try to process
+ * it again rather than reading a new one
+ */
+ inmsg = chipset_dev->controlvm_pending_msg;
+ chipset_dev->controlvm_pending_msg_valid = false;
+ err = 0;
+ } else {
+ err = read_controlvm_event(&inmsg);
+ }
+ while (!err) {
+ chipset_dev->most_recent_message_jiffies = jiffies;
+ err = handle_command(inmsg,
+ visorchannel_get_physaddr
+ (chipset_dev->controlvm_channel));
+ if (err == -EAGAIN) {
+ chipset_dev->controlvm_pending_msg = inmsg;
+ chipset_dev->controlvm_pending_msg_valid = true;
+ break;
+ }
+
+ err = read_controlvm_event(&inmsg);
+ }
+ /* parahotplug_worker */
+ parahotplug_process_list();
+
+/*
+ * The controlvm messages are sent in a bulk. If we start receiving messages, we
+ * want the polling to be fast. If we do not receive any message for
+ * MIN_IDLE_SECONDS, we can slow down the polling.
+ */
+schedule_out:
+ if (time_after(jiffies, chipset_dev->most_recent_message_jiffies +
+ (HZ * MIN_IDLE_SECONDS))) {
+ /*
+ * it's been longer than MIN_IDLE_SECONDS since we processed
+ * our last controlvm message; slow down the polling
+ */
+ if (chipset_dev->poll_jiffies != POLLJIFFIES_CONTROLVM_SLOW)
+ chipset_dev->poll_jiffies = POLLJIFFIES_CONTROLVM_SLOW;
+ } else {
+ if (chipset_dev->poll_jiffies != POLLJIFFIES_CONTROLVM_FAST)
+ chipset_dev->poll_jiffies = POLLJIFFIES_CONTROLVM_FAST;
+ }
+ schedule_delayed_work(&chipset_dev->periodic_controlvm_work,
+ chipset_dev->poll_jiffies);
+}
+
+static int visorchipset_init(struct acpi_device *acpi_device)
+{
+ int err = -ENODEV;
+ struct visorchannel *controlvm_channel;
+
+ chipset_dev = kzalloc(sizeof(*chipset_dev), GFP_KERNEL);
+ if (!chipset_dev)
+ goto error;
+ err = controlvm_channel_create(chipset_dev);
+ if (err)
+ goto error_free_chipset_dev;
+ acpi_device->driver_data = chipset_dev;
+ chipset_dev->acpi_device = acpi_device;
+ chipset_dev->poll_jiffies = POLLJIFFIES_CONTROLVM_FAST;
+ err = sysfs_create_groups(&chipset_dev->acpi_device->dev.kobj,
+ visorchipset_dev_groups);
+ if (err < 0)
+ goto error_destroy_channel;
+ controlvm_channel = chipset_dev->controlvm_channel;
+ if (!visor_check_channel(visorchannel_get_header(controlvm_channel),
+ &chipset_dev->acpi_device->dev,
+ &visor_controlvm_channel_guid,
+ "controlvm",
+ sizeof(struct visor_controlvm_channel),
+ VISOR_CONTROLVM_CHANNEL_VERSIONID,
+ VISOR_CHANNEL_SIGNATURE))
+ goto error_delete_groups;
+ /* if booting in a crash kernel */
+ if (is_kdump_kernel())
+ INIT_DELAYED_WORK(&chipset_dev->periodic_controlvm_work,
+ setup_crash_devices_work_queue);
+ else
+ INIT_DELAYED_WORK(&chipset_dev->periodic_controlvm_work,
+ controlvm_periodic_work);
+ chipset_dev->most_recent_message_jiffies = jiffies;
+ chipset_dev->poll_jiffies = POLLJIFFIES_CONTROLVM_FAST;
+ schedule_delayed_work(&chipset_dev->periodic_controlvm_work,
+ chipset_dev->poll_jiffies);
+ err = visorbus_init();
+ if (err < 0)
+ goto error_cancel_work;
+ return 0;
+
+error_cancel_work:
+ cancel_delayed_work_sync(&chipset_dev->periodic_controlvm_work);
+
+error_delete_groups:
+ sysfs_remove_groups(&chipset_dev->acpi_device->dev.kobj,
+ visorchipset_dev_groups);
+
+error_destroy_channel:
+ visorchannel_destroy(chipset_dev->controlvm_channel);
+
+error_free_chipset_dev:
+ kfree(chipset_dev);
+
+error:
+ dev_err(&acpi_device->dev, "failed with error %d\n", err);
+ return err;
+}
+
+static int visorchipset_exit(struct acpi_device *acpi_device)
+{
+ visorbus_exit();
+ cancel_delayed_work_sync(&chipset_dev->periodic_controlvm_work);
+ sysfs_remove_groups(&chipset_dev->acpi_device->dev.kobj,
+ visorchipset_dev_groups);
+ visorchannel_destroy(chipset_dev->controlvm_channel);
+ kfree(chipset_dev);
+ return 0;
+}
+
+static const struct acpi_device_id unisys_device_ids[] = {
+ {"PNP0A07", 0},
+ {"", 0},
+};
+
+static struct acpi_driver unisys_acpi_driver = {
+ .name = "unisys_acpi",
+ .class = "unisys_acpi_class",
+ .owner = THIS_MODULE,
+ .ids = unisys_device_ids,
+ .ops = {
+ .add = visorchipset_init,
+ .remove = visorchipset_exit,
+ },
+};
+
+MODULE_DEVICE_TABLE(acpi, unisys_device_ids);
+
+static __init int visorutil_spar_detect(void)
+{
+ unsigned int eax, ebx, ecx, edx;
+
+ if (boot_cpu_has(X86_FEATURE_HYPERVISOR)) {
+ /* check the ID */
+ cpuid(UNISYS_VISOR_LEAF_ID, &eax, &ebx, &ecx, &edx);
+ return (ebx == UNISYS_VISOR_ID_EBX) &&
+ (ecx == UNISYS_VISOR_ID_ECX) &&
+ (edx == UNISYS_VISOR_ID_EDX);
+ }
+ return 0;
+}
+
+static int __init init_unisys(void)
+{
+ int result;
+
+ if (!visorutil_spar_detect())
+ return -ENODEV;
+ result = acpi_bus_register_driver(&unisys_acpi_driver);
+ if (result)
+ return -ENODEV;
+ pr_info("Unisys Visorchipset Driver Loaded.\n");
+ return 0;
+};
+
+static void __exit exit_unisys(void)
+{
+ acpi_bus_unregister_driver(&unisys_acpi_driver);
+}
+
+module_init(init_unisys);
+module_exit(exit_unisys);
+
+MODULE_AUTHOR("Unisys");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("s-Par visorbus driver for virtual device buses");