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authorDan Williams <dan.j.williams@intel.com>2011-05-10 02:28:45 -0700
committerDan Williams <dan.j.williams@intel.com>2011-07-03 04:04:47 -0700
commitf1f52e75939b56c40b3d153ae99faf2720250242 (patch)
tree9c5ba4f8bb6a589c6a038dac5bbba280f9de3ebe /drivers/scsi/isci/request.c
parent3bff9d54ecba84e538da822349a9a6fd6e534539 (diff)
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 <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/scsi/isci/request.c')
-rw-r--r--drivers/scsi/isci/request.c2016
1 files changed, 1701 insertions, 315 deletions
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
@@ -54,407 +54,1128 @@
*/
#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)
+/**
+ * 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;
+ }
+
+ return &sci_req->sg_table[sgl_pair_index - 2];
+}
+
+/**
+ * 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)
{
- enum sci_status status;
+ 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);
- dev_dbg(&request->isci_host->pdev->dev,
- "%s: request = %p\n",
- __func__,
- request);
- status = scic_io_request_construct_basic_ssp(&request->sci);
- return status;
+ dma_addr = dma_map_single(&isci_host->pdev->dev,
+ task->scatter,
+ task->total_xfer_len,
+ task->data_dir);
+
+ isci_request->zero_scatter_daddr = dma_addr;
+
+ 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);
+ }
+
+ if (scu_sg) {
+ scu_sg->next_pair_upper = 0;
+ scu_sg->next_pair_lower = 0;
+ }
}
-static enum sci_status isci_request_stp_request_construct(
- struct isci_request *request)
+static void scic_sds_ssp_io_request_assign_buffers(struct scic_sds_request *sci_req)
{
- struct sas_task *task = isci_request_access_task(request);
- enum sci_status status;
- struct host_to_dev_fis *register_fis;
+ if (sci_req->was_tag_assigned_by_user == false)
+ sci_req->task_context_buffer = &sci_req->tc;
+}
- dev_dbg(&request->isci_host->pdev->dev,
- "%s: request = %p\n",
- __func__,
- request);
+static void scic_sds_io_request_build_ssp_command_iu(struct scic_sds_request *sci_req)
+{
+ 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);
- /* 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);
+ cmd_iu = &sci_req->ssp.cmd;
- status = scic_io_request_construct_basic_sata(&request->sci);
+ 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;
- /* Set the ncq tag in the fis, from the queue
- * command in the task.
- */
- if (isci_sata_is_task_ncq(task)) {
+ sci_swab32_cpy(&cmd_iu->cdb, task->ssp_task.cdb,
+ sizeof(task->ssp_task.cdb) / sizeof(u32));
+}
- isci_sata_set_ncq_tag(
- register_fis,
- task
- );
+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);
+
+ 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;
+}
+
+/**
+ * This method is will fill in the SCU Task Context for any type of SSP request.
+ * @sci_req:
+ * @task_context:
+ *
+ */
+static void scu_ssp_reqeust_construct_task_context(
+ struct scic_sds_request *sds_request,
+ struct scu_task_context *task_context)
+{
+ 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));
}
- return status;
+ /*
+ * 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);
+
+ 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
+ */
+ dma_addr = scic_io_request_get_dma_addr(sds_request,
+ &sds_request->ssp.rsp);
+
+ task_context->response_iu_upper = upper_32_bits(dma_addr);
+ task_context->response_iu_lower = lower_32_bits(dma_addr);
}
-/*
- * isci_smp_request_build() - This function builds the smp request.
- * @ireq: This parameter points to the isci_request allocated in the
- * request construct function.
+/**
+ * This method is will fill in the SCU Task Context for a SSP IO request.
+ * @sci_req:
*
- * SCI_SUCCESS on successfull completion, or specific failure code.
*/
-static enum sci_status isci_smp_request_build(struct isci_request *ireq)
+static void scu_ssp_io_request_construct_task_context(
+ struct scic_sds_request *sci_req,
+ enum dma_data_direction dir,
+ u32 len)
{
- enum sci_status status = SCI_FAILURE;
- struct sas_task *task = isci_request_access_task(ireq);
- struct scic_sds_request *sci_req = &ireq->sci;
+ struct scu_task_context *task_context;
- dev_dbg(&ireq->isci_host->pdev->dev,
- "%s: request = %p\n", __func__, ireq);
+ task_context = scic_sds_request_get_task_context(sci_req);
- dev_dbg(&ireq->isci_host->pdev->dev,
- "%s: smp_req len = %d\n",
- __func__,
- task->smp_task.smp_req.length);
+ scu_ssp_reqeust_construct_task_context(sci_req, task_context);
- /* 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));
+ task_context->ssp_command_iu_length =
+ sizeof(struct ssp_cmd_iu) / sizeof(u32);
+ task_context->type.ssp.frame_type = SSP_COMMAND;
- 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);
+ switch (dir) {
+ case DMA_FROM_DEVICE:
+ case DMA_NONE:
+ default:
+ task_context->task_type = SCU_TASK_TYPE_IOREAD;
+ break;
+ case DMA_TO_DEVICE:
+ task_context->task_type = SCU_TASK_TYPE_IOWRITE;
+ break;
+ }
- return status;
+ 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_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 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 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_task_request_construct_task_context(
+ struct scic_sds_request *sci_req)
{
- 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;
+ struct scu_task_context *task_context;
- dev_dbg(&isci_host->pdev->dev,
- "%s: isci_device = 0x%p; request = %p, "
- "num_scatter = %d\n",
- __func__,
- isci_device,
- request,
- task->num_scatter);
+ task_context = scic_sds_request_get_task_context(sci_req);
- /* 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)) {
+ scu_ssp_reqeust_construct_task_context(sci_req, task_context);
- request->num_sg_entries = dma_map_sg(
- &isci_host->pdev->dev,
- task->scatter,
- task->num_scatter,
- task->data_dir
- );
+ 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);
+}
- 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);
+/**
+ * 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
+ */
- if (status != SCI_SUCCESS) {
- dev_warn(&isci_host->pdev->dev,
- "%s: failed request construct\n",
- __func__);
- return SCI_FAILURE;
+
+/**
+ * This method constructs the SATA request object.
+ * @sci_req:
+ * @sat_protocol:
+ * @transfer_length:
+ * @data_direction:
+ * @copy_rx_frame:
+ *
+ * enum sci_status
+ */
+static enum sci_status
+scic_io_request_construct_sata(struct scic_sds_request *sci_req,
+ u32 len,
+ enum dma_data_direction dir,
+ bool copy)
+{
+ 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);
+
+ /* 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)
+ 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;
+ }
}
- 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__);
+ 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)
+{
+ struct isci_request *ireq = sci_req_to_ireq(sci_req);
+ struct sas_task *task = isci_request_access_task(ireq);
+
+ sci_req->protocol = SCIC_SSP_PROTOCOL;
+
+ scu_ssp_io_request_construct_task_context(sci_req,
+ task->data_dir,
+ task->total_xfer_len);
+
+ scic_sds_io_request_build_ssp_command_iu(sci_req);
+
+ sci_base_state_machine_change_state(
+ &sci_req->state_machine,
+ SCI_BASE_REQUEST_STATE_CONSTRUCTED);
+
+ return SCI_SUCCESS;
+}
+
+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);
+
+ /* Fill in the SSP Task IU */
+ scic_sds_task_request_build_ssp_task_iu(sci_req);
+
+ sci_base_state_machine_change_state(&sci_req->state_machine,
+ SCI_BASE_REQUEST_STATE_CONSTRUCTED);
+
return 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);
+
+ stp_req = &sci_req->stp.req;
+ sci_req->protocol = SCIC_STP_PROTOCOL;
+
+ 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_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.
+ * sci_req_tx_bytes - bytes transferred when reply underruns request
+ * @sci_req: request that was terminated early
*/
-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)
+#define SCU_TASK_CONTEXT_SRAM 0x200000
+static u32 sci_req_tx_bytes(struct scic_sds_request *sci_req)
{
- int ret = 0;
- dma_addr_t handle;
- struct isci_request *request;
+ 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 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;
+ /* 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)));
}
- /* 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;
+ return ret_val;
+}
- request->num_sg_entries = 0;
+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;
- request->complete_in_target = false;
+ if (request->state_handlers->start_handler)
+ return request->state_handlers->start_handler(request);
- INIT_LIST_HEAD(&request->completed_node);
- INIT_LIST_HEAD(&request->dev_node);
+ 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));
- *isci_request = request;
- isci_request_change_state(request, allocated);
+ return SCI_FAILURE_INVALID_STATE;
+}
- return ret;
+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__,
+ sci_base_state_machine_get_state(&request->state_machine));
+
+ return SCI_FAILURE_INVALID_STATE;
}
-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)
+enum sci_status scic_sds_io_request_event_handler(
+ struct scic_sds_request *request,
+ u32 event_code)
{
- int retval = isci_request_alloc_core(isci_host, isci_request,
- isci_device, gfp_flags);
+ if (request->state_handlers->event_handler)
+ return request->state_handlers->event_handler(request, event_code);
- if (!retval) {
- (*isci_request)->ttype_ptr.io_task_ptr = task;
- (*isci_request)->ttype = io_task;
+ 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));
- task->lldd_task = *isci_request;
- }
- return retval;
+ return SCI_FAILURE_INVALID_STATE;
}
/**
- * 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.
+ * @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
*/
-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)
+enum sci_status scic_sds_io_request_frame_handler(
+ struct scic_sds_request *request,
+ u32 frame_index)
{
- int retval = isci_request_alloc_core(isci_host, isci_request,
- isci_device, gfp_flags);
+ 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;
+}
- if (!retval) {
+/*
+ * 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.
+ */
+void scic_sds_io_request_copy_response(struct scic_sds_request *sci_req)
+{
+ 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);
- (*isci_request)->ttype_ptr.tmf_task_ptr = isci_tmf;
- (*isci_request)->ttype = tmf_task;
+ ssp_response = &sci_req->ssp.rsp;
+
+ resp_buf = &isci_tmf->resp.resp_iu;
+
+ len = min_t(u32,
+ SSP_RESP_IU_MAX_SIZE,
+ be32_to_cpu(ssp_response->response_data_len));
+
+ memcpy(resp_buf, ssp_response->resp_data, len);
+}
+
+/*
+ * 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;
+
+ if (request->io_tag == SCI_CONTROLLER_INVALID_IO_TAG) {
+ request->io_tag =
+ scic_controller_allocate_io_tag(request->owning_controller);
}
- return retval;
+
+ /* Record the IO Tag in the request */
+ if (request->io_tag != SCI_CONTROLLER_INVALID_IO_TAG) {
+ task_context = request->task_context_buffer;
+
+ task_context->task_index = scic_sds_io_tag_get_index(request->io_tag);
+
+ 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;
+
+ case SCU_TASK_CONTEXT_PROTOCOL_STP:
+ /*
+ * STP/SATA Frame
+ * task_context->type.stp.ncq_tag = request->ncq_tag; */
+ break;
+
+ case SCU_TASK_CONTEXT_PROTOCOL_NONE:
+ /* / @todo When do we set no protocol type? */
+ break;
+
+ default:
+ /* This should never happen since we build the IO requests */
+ break;
+ }
+
+ /*
+ * 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);
+ }
+
+ /* 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);
+
+ return SCI_SUCCESS;
+ }
+
+ return SCI_FAILURE_INSUFFICIENT_RESOURCES;
}
-/**
- * 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.
+/*
+ * 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;
+}
+
+/*
+ * *****************************************************************************
+ * * STARTED 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. 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);
+
+ sci_base_state_machine_change_state(&request->state_machine,
+ SCI_BASE_REQUEST_STATE_ABORTING);
+ return SCI_SUCCESS;
+}
+
+/*
+ * 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.
*
- * 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)
+static enum sci_status
+scic_sds_request_started_state_tc_completion_handler(struct scic_sds_request *sci_req,
+ u32 completion_code)
{
- 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;
+ u8 datapres;
+ struct ssp_response_iu *resp_iu;
- isci_device = task->dev->lldd_dev;
- sci_device = &isci_device->sci;
+ /*
+ * 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;
- /* do common allocation and init of request object. */
- ret = isci_request_alloc_io(
- isci_host,
- task,
- &request,
- isci_device,
- gfp_flags
- );
+ 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;
- if (ret)
- goto out;
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_CHECK_RESPONSE):
+ {
+ ssize_t word_cnt = SSP_RESP_IU_MAX_SIZE / sizeof(u32);
- 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_swab32_cpy(&sci_req->ssp.rsp,
+ &sci_req->ssp.rsp,
+ word_cnt);
+
+ scic_sds_request_set_status(sci_req,
+ SCU_TASK_DONE_CHECK_RESPONSE,
+ SCI_FAILURE_IO_RESPONSE_VALID);
+ break;
}
- spin_lock_irqsave(&isci_host->scic_lock, flags);
+ 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;
- /* 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;
+ /* 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;
+
+ /* 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;
+
+ /* 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:
+ 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;
}
- /* 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.
+ /*
+ * TODO: This is probably wrong for ACK/NAK timeout conditions
*/
- isci_request_change_state(request, started);
- list_add(&request->dev_node, &isci_device->reqs_in_process);
- if (status == SCI_SUCCESS) {
- /* Save the tag for possible task mgmt later. */
- request->io_tag = scic_io_request_get_io_tag(&request->sci);
+ /* 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;
+}
+
+enum sci_status
+scic_sds_io_request_tc_completion(struct scic_sds_request *request, u32 completion_code)
+{
+ 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));
+
+ return SCI_FAILURE_INVALID_STATE;
+
+}
+
+/*
+ * 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 {
- /* The request did not really start in the
- * hardware, so clear the request handle
- * here so no terminations will be done.
- */
- request->terminated = true;
+ /* 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__,
+ sci_req,
+ frame_index,
+ ssp_hdr.frame_type);
}
- 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);
+ /*
+ * 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);
- /* Cause this task to be scheduled in the SCSI error
- * handler thread.
- */
- isci_execpath_callback(isci_host, task,
- sas_task_abort);
+ return SCI_SUCCESS;
+}
- /* Change the status, since we are holding
- * the I/O until it is managed by the SCSI
- * error handler.
- */
- status = SCI_SUCCESS;
+/*
+ * *****************************************************************************
+ * * COMPLETED STATE HANDLERS
+ * ***************************************************************************** */
+
+
+/*
+ * 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);
}
- out:
- if (status != SCI_SUCCESS) {
- /* release dma memory on failure. */
- isci_request_free(isci_host, request);
- request = NULL;
- ret = SCI_FAILURE;
+ if (request->saved_rx_frame_index != SCU_INVALID_FRAME_INDEX) {
+ scic_sds_controller_release_frame(
+ request->owning_controller, request->saved_rx_frame_index);
}
- *isci_request = request;
- return ret;
+ sci_base_state_machine_change_state(&request->state_machine,
+ SCI_BASE_REQUEST_STATE_FINAL);
+ return SCI_SUCCESS;
+}
+
+/*
+ * *****************************************************************************
+ * * 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_process_response_iu() - This function sets the status and
@@ -541,7 +1262,7 @@ static void isci_request_handle_controller_specific_errors(
{
unsigned int cstatus;
- cstatus = scic_request_get_controller_status(&request->sci);
+ cstatus = request->sci.scu_status;
dev_dbg(&request->isci_host->pdev->dev,
"%s: %p SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR "
@@ -833,20 +1554,9 @@ static void isci_task_save_for_upper_layer_completion(
}
}
-/**
- * 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.
- *
- * 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_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;
@@ -1035,8 +1745,7 @@ void isci_request_io_request_complete(
* 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);
+ u32 transferred_length = sci_req_tx_bytes(&request->sci);
task->task_status.residual
= task->total_xfer_len - transferred_length;
@@ -1158,3 +1867,680 @@ void isci_request_io_request_complete(
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;
+
+
+ /* 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;
+
+ 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_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);
+
+ if (!retval) {
+
+ (*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.
+ */
+ isci_request_change_state(request, started);
+ list_add(&request->dev_node, &isci_device->reqs_in_process);
+
+ 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;
+}
+
+
+

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