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authorDan Williams <dan.j.williams@intel.com>2011-06-28 13:47:09 -0700
committerDan Williams <dan.j.williams@intel.com>2011-07-03 04:04:51 -0700
commit312e0c2455c18716cf640d4336dcb1e9e5053818 (patch)
treebe2dbc9a3e5ba39783448f0029231ea43e6e0428 /drivers/scsi/isci/request.c
parent9274f45ea551421cd3bf329de9dd8d1e6208285a (diff)
isci: unify can_queue tracking on the tci_pool, uplevel tag assignment
The tci_pool tracks our outstanding command slots which are also the 'index' portion of our tags. Grabbing the tag early in ->lldd_execute_task let's us drop the isci_host_can_queue() and ->was_tag_assigned_by_user infrastructure. ->was_tag_assigned_by_user required the task context to be duplicated in request-local buffer. With the tci established early we can build the task_context directly into its final location and skip a memcpy. With the task context buffer at a known address at request construction we have the opportunity/obligation to also fix sgl handling. This rework feels like it belongs in another patch but the sgl handling and task_context are too intertwined. 1/ fix the 'ab' pair embedded in the task context to point to the 'cd' pair in the task context (previously we were prematurely linking to the staging buffer). 2/ fix the broken iteration of pio sgls that assumes all sgls are relative to the request, and does a dangerous looking reverse lookup of physical address to virtual address. 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.c469
1 files changed, 163 insertions, 306 deletions
diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c
index 08a7340b33bf..55859d5331b1 100644
--- a/drivers/scsi/isci/request.c
+++ b/drivers/scsi/isci/request.c
@@ -61,42 +61,50 @@
#include "scu_event_codes.h"
#include "sas.h"
-/**
- * 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;
+static struct scu_sgl_element_pair *to_sgl_element_pair(struct scic_sds_request *sci_req,
+ int idx)
+{
+ if (idx == 0)
+ return &sci_req->tc->sgl_pair_ab;
+ else if (idx == 1)
+ return &sci_req->tc->sgl_pair_cd;
+ else if (idx < 0)
+ return NULL;
+ else
+ return &sci_req->sg_table[idx - 2];
+}
- task_context = (struct scu_task_context *)sci_req->task_context_buffer;
+static dma_addr_t to_sgl_element_pair_dma(struct scic_sds_controller *scic,
+ struct scic_sds_request *sci_req, u32 idx)
+{
+ u32 offset;
- if (sgl_pair_index == 0) {
- return &task_context->sgl_pair_ab;
- } else if (sgl_pair_index == 1) {
- return &task_context->sgl_pair_cd;
+ if (idx == 0) {
+ offset = (void *) &sci_req->tc->sgl_pair_ab -
+ (void *) &scic->task_context_table[0];
+ return scic->task_context_dma + offset;
+ } else if (idx == 1) {
+ offset = (void *) &sci_req->tc->sgl_pair_cd -
+ (void *) &scic->task_context_table[0];
+ return scic->task_context_dma + offset;
}
- return &sci_req->sg_table[sgl_pair_index - 2];
+ return scic_io_request_get_dma_addr(sci_req, &sci_req->sg_table[idx - 2]);
+}
+
+static void init_sgl_element(struct scu_sgl_element *e, struct scatterlist *sg)
+{
+ e->length = sg_dma_len(sg);
+ e->address_upper = upper_32_bits(sg_dma_address(sg));
+ e->address_lower = lower_32_bits(sg_dma_address(sg));
+ e->address_modifier = 0;
}
-/**
- * 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.
- *
- */
static void scic_sds_request_build_sgl(struct scic_sds_request *sds_request)
{
struct isci_request *isci_request = sci_req_to_ireq(sds_request);
struct isci_host *isci_host = isci_request->isci_host;
+ struct scic_sds_controller *scic = &isci_host->sci;
struct sas_task *task = isci_request_access_task(isci_request);
struct scatterlist *sg = NULL;
dma_addr_t dma_addr;
@@ -108,25 +116,19 @@ static void scic_sds_request_build_sgl(struct scic_sds_request *sds_request)
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);
-
+ scu_sg = to_sgl_element_pair(sds_request, sg_idx);
+ init_sgl_element(&scu_sg->A, sg);
sg = sg_next(sg);
-
if (sg) {
- SCU_SGL_COPY(scu_sg->B, sg);
+ init_sgl_element(&scu_sg->B, sg);
sg = sg_next(sg);
} else
- SCU_SGL_ZERO(scu_sg->B);
+ memset(&scu_sg->B, 0, sizeof(scu_sg->B));
if (prev_sg) {
- dma_addr =
- scic_io_request_get_dma_addr(
- sds_request,
- scu_sg);
+ dma_addr = to_sgl_element_pair_dma(scic,
+ sds_request,
+ sg_idx);
prev_sg->next_pair_upper =
upper_32_bits(dma_addr);
@@ -138,8 +140,7 @@ static void scic_sds_request_build_sgl(struct scic_sds_request *sds_request)
sg_idx++;
}
} else { /* handle when no sg */
- scu_sg = scic_sds_request_get_sgl_element_pair(sds_request,
- sg_idx);
+ scu_sg = to_sgl_element_pair(sds_request, sg_idx);
dma_addr = dma_map_single(&isci_host->pdev->dev,
task->scatter,
@@ -246,35 +247,12 @@ static void scu_ssp_reqeust_construct_task_context(
/* 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) |
- ISCI_TAG_TCI(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));
- }
+ 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) |
+ ISCI_TAG_TCI(sds_request->io_tag));
/*
* Copy the physical address for the command buffer to the
@@ -302,14 +280,11 @@ static void scu_ssp_reqeust_construct_task_context(
* @sci_req:
*
*/
-static void scu_ssp_io_request_construct_task_context(
- struct scic_sds_request *sci_req,
- enum dma_data_direction dir,
- u32 len)
+static void scu_ssp_io_request_construct_task_context(struct scic_sds_request *sci_req,
+ enum dma_data_direction dir,
+ u32 len)
{
- struct scu_task_context *task_context;
-
- task_context = scic_sds_request_get_task_context(sci_req);
+ struct scu_task_context *task_context = sci_req->tc;
scu_ssp_reqeust_construct_task_context(sci_req, task_context);
@@ -347,12 +322,9 @@ static void scu_ssp_io_request_construct_task_context(
* constructed.
*
*/
-static void scu_ssp_task_request_construct_task_context(
- struct scic_sds_request *sci_req)
+static void scu_ssp_task_request_construct_task_context(struct scic_sds_request *sci_req)
{
- struct scu_task_context *task_context;
-
- task_context = scic_sds_request_get_task_context(sci_req);
+ struct scu_task_context *task_context = sci_req->tc;
scu_ssp_reqeust_construct_task_context(sci_req, task_context);
@@ -421,35 +393,12 @@ static void scu_sata_reqeust_construct_task_context(
/* Set the first word of the H2D REG FIS */
task_context->type.words[0] = *(u32 *)&sci_req->stp.cmd;
- if (sci_req->was_tag_assigned_by_user) {
- /*
- * Build the task context now since we have already read
- * the data
- */
- sci_req->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) |
- ISCI_TAG_TCI(sci_req->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.
- */
- sci_req->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));
- }
-
+ sci_req->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) |
+ ISCI_TAG_TCI(sci_req->io_tag));
/*
* Copy the physical address for the command buffer to the SCU Task
* Context. We must offset the command buffer by 4 bytes because the
@@ -467,22 +416,9 @@ static void scu_sata_reqeust_construct_task_context(
task_context->response_iu_lower = 0;
}
-
-
-/**
- * scu_stp_raw_request_construct_task_context -
- * @sci_req: This parameter specifies the STP request object for which to
- * construct a RAW command frame task context.
- * @task_context: This parameter specifies the SCU specific task context buffer
- * to construct.
- *
- * This method performs the operations common to all SATA/STP requests
- * utilizing the raw frame method. none
- */
-static void scu_stp_raw_request_construct_task_context(struct scic_sds_stp_request *stp_req,
- struct scu_task_context *task_context)
+static void scu_stp_raw_request_construct_task_context(struct scic_sds_request *sci_req)
{
- struct scic_sds_request *sci_req = to_sci_req(stp_req);
+ struct scu_task_context *task_context = sci_req->tc;
scu_sata_reqeust_construct_task_context(sci_req, task_context);
@@ -500,8 +436,7 @@ scic_sds_stp_pio_request_construct(struct scic_sds_request *sci_req,
struct scic_sds_stp_request *stp_req = &sci_req->stp.req;
struct scic_sds_stp_pio_request *pio = &stp_req->type.pio;
- scu_stp_raw_request_construct_task_context(stp_req,
- sci_req->task_context_buffer);
+ scu_stp_raw_request_construct_task_context(sci_req);
pio->current_transfer_bytes = 0;
pio->ending_error = 0;
@@ -512,13 +447,10 @@ scic_sds_stp_pio_request_construct(struct scic_sds_request *sci_req,
if (copy_rx_frame) {
scic_sds_request_build_sgl(sci_req);
- /* Since the IO request copy of the TC contains the same data as
- * the actual TC this pointer is vaild for either.
- */
- pio->request_current.sgl_pair = &sci_req->task_context_buffer->sgl_pair_ab;
+ pio->request_current.sgl_index = 0;
} else {
/* The user does not want the data copied to the SGL buffer location */
- pio->request_current.sgl_pair = NULL;
+ pio->request_current.sgl_index = -1;
}
return SCI_SUCCESS;
@@ -541,7 +473,7 @@ static void scic_sds_stp_optimized_request_construct(struct scic_sds_request *sc
u32 len,
enum dma_data_direction dir)
{
- struct scu_task_context *task_context = sci_req->task_context_buffer;
+ struct scu_task_context *task_context = sci_req->tc;
/* Build the STP task context structure */
scu_sata_reqeust_construct_task_context(sci_req, task_context);
@@ -587,8 +519,7 @@ scic_io_request_construct_sata(struct scic_sds_request *sci_req,
if (tmf->tmf_code == isci_tmf_sata_srst_high ||
tmf->tmf_code == isci_tmf_sata_srst_low) {
- scu_stp_raw_request_construct_task_context(&sci_req->stp.req,
- sci_req->task_context_buffer);
+ scu_stp_raw_request_construct_task_context(sci_req);
return SCI_SUCCESS;
} else {
dev_err(scic_to_dev(sci_req->owning_controller),
@@ -611,8 +542,7 @@ scic_io_request_construct_sata(struct scic_sds_request *sci_req,
/* non data */
if (task->data_dir == DMA_NONE) {
- scu_stp_raw_request_construct_task_context(&sci_req->stp.req,
- sci_req->task_context_buffer);
+ scu_stp_raw_request_construct_task_context(sci_req);
return SCI_SUCCESS;
}
@@ -701,8 +631,7 @@ enum sci_status scic_task_request_construct_sata(struct scic_sds_request *sci_re
if (tmf->tmf_code == isci_tmf_sata_srst_high ||
tmf->tmf_code == isci_tmf_sata_srst_low) {
- scu_stp_raw_request_construct_task_context(&sci_req->stp.req,
- sci_req->task_context_buffer);
+ scu_stp_raw_request_construct_task_context(sci_req);
} else {
dev_err(scic_to_dev(sci_req->owning_controller),
"%s: Request 0x%p received un-handled SAT "
@@ -749,9 +678,9 @@ static u32 sci_req_tx_bytes(struct scic_sds_request *sci_req)
enum sci_status scic_sds_request_start(struct scic_sds_request *sci_req)
{
- struct scic_sds_controller *scic = sci_req->owning_controller;
- struct scu_task_context *task_context;
enum sci_base_request_states state;
+ struct scu_task_context *tc = sci_req->tc;
+ struct scic_sds_controller *scic = sci_req->owning_controller;
state = sci_req->sm.current_state_id;
if (state != SCI_REQ_CONSTRUCTED) {
@@ -761,61 +690,39 @@ enum sci_status scic_sds_request_start(struct scic_sds_request *sci_req)
return SCI_FAILURE_INVALID_STATE;
}
- /* 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.
- */
- if (sci_req->io_tag == SCI_CONTROLLER_INVALID_IO_TAG)
- sci_req->io_tag = scic_controller_allocate_io_tag(scic);
-
- /* Record the IO Tag in the request */
- if (sci_req->io_tag != SCI_CONTROLLER_INVALID_IO_TAG) {
- task_context = sci_req->task_context_buffer;
-
- task_context->task_index = ISCI_TAG_TCI(sci_req->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 = sci_req->io_tag;
- task_context->type.ssp.target_port_transfer_tag =
- 0xFFFF;
- break;
+ tc->task_index = ISCI_TAG_TCI(sci_req->io_tag);
- case SCU_TASK_CONTEXT_PROTOCOL_STP:
- /* STP/SATA Frame
- * task_context->type.stp.ncq_tag = sci_req->ncq_tag;
- */
- break;
-
- case SCU_TASK_CONTEXT_PROTOCOL_NONE:
- /* / @todo When do we set no protocol type? */
- break;
+ switch (tc->protocol_type) {
+ case SCU_TASK_CONTEXT_PROTOCOL_SMP:
+ case SCU_TASK_CONTEXT_PROTOCOL_SSP:
+ /* SSP/SMP Frame */
+ tc->type.ssp.tag = sci_req->io_tag;
+ tc->type.ssp.target_port_transfer_tag = 0xFFFF;
+ break;
- default:
- /* This should never happen since we build the IO
- * requests */
- break;
- }
+ case SCU_TASK_CONTEXT_PROTOCOL_STP:
+ /* STP/SATA Frame
+ * tc->type.stp.ncq_tag = sci_req->ncq_tag;
+ */
+ break;
- /*
- * Check to see if we need to copy the task context buffer
- * or have been building into the task context buffer */
- if (sci_req->was_tag_assigned_by_user == false)
- scic_sds_controller_copy_task_context(scic, sci_req);
+ case SCU_TASK_CONTEXT_PROTOCOL_NONE:
+ /* / @todo When do we set no protocol type? */
+ break;
- /* Add to the post_context the io tag value */
- sci_req->post_context |= ISCI_TAG_TCI(sci_req->io_tag);
+ default:
+ /* This should never happen since we build the IO
+ * requests */
+ break;
+ }
- /* Everything is good go ahead and change state */
- sci_change_state(&sci_req->sm, SCI_REQ_STARTED);
+ /* Add to the post_context the io tag value */
+ sci_req->post_context |= ISCI_TAG_TCI(sci_req->io_tag);
- return SCI_SUCCESS;
- }
+ /* Everything is good go ahead and change state */
+ sci_change_state(&sci_req->sm, SCI_REQ_STARTED);
- return SCI_FAILURE_INSUFFICIENT_RESOURCES;
+ return SCI_SUCCESS;
}
enum sci_status
@@ -880,9 +787,6 @@ enum sci_status scic_sds_request_complete(struct scic_sds_request *sci_req)
"isci: request completion from wrong state (%d)\n", state))
return SCI_FAILURE_INVALID_STATE;
- if (!sci_req->was_tag_assigned_by_user)
- scic_controller_free_io_tag(scic, sci_req->io_tag);
-
if (sci_req->saved_rx_frame_index != SCU_INVALID_FRAME_INDEX)
scic_sds_controller_release_frame(scic,
sci_req->saved_rx_frame_index);
@@ -1244,51 +1148,40 @@ void scic_stp_io_request_set_ncq_tag(struct scic_sds_request *req,
* @note This could be made to return an error to the user if the user
* attempts to set the NCQ tag in the wrong state.
*/
- req->task_context_buffer->type.stp.ncq_tag = ncq_tag;
+ req->tc->type.stp.ncq_tag = ncq_tag;
}
-/**
- *
- * @sci_req:
- *
- * Get the next SGL element from the request. - Check on which SGL element pair
- * we are working - if working on SLG pair element A - advance to element B -
- * else - check to see if there are more SGL element pairs for this IO request
- * - if there are more SGL element pairs - advance to the next pair and return
- * element A struct scu_sgl_element*
- */
-static struct scu_sgl_element *scic_sds_stp_request_pio_get_next_sgl(struct scic_sds_stp_request *stp_req)
+static struct scu_sgl_element *pio_sgl_next(struct scic_sds_stp_request *stp_req)
{
- struct scu_sgl_element *current_sgl;
+ struct scu_sgl_element *sgl;
+ struct scu_sgl_element_pair *sgl_pair;
struct scic_sds_request *sci_req = to_sci_req(stp_req);
struct scic_sds_request_pio_sgl *pio_sgl = &stp_req->type.pio.request_current;
- if (pio_sgl->sgl_set == SCU_SGL_ELEMENT_PAIR_A) {
- if (pio_sgl->sgl_pair->B.address_lower == 0 &&
- pio_sgl->sgl_pair->B.address_upper == 0) {
- current_sgl = NULL;
+ sgl_pair = to_sgl_element_pair(sci_req, pio_sgl->sgl_index);
+ if (!sgl_pair)
+ sgl = NULL;
+ else if (pio_sgl->sgl_set == SCU_SGL_ELEMENT_PAIR_A) {
+ if (sgl_pair->B.address_lower == 0 &&
+ sgl_pair->B.address_upper == 0) {
+ sgl = NULL;
} else {
pio_sgl->sgl_set = SCU_SGL_ELEMENT_PAIR_B;
- current_sgl = &pio_sgl->sgl_pair->B;
+ sgl = &sgl_pair->B;
}
} else {
- if (pio_sgl->sgl_pair->next_pair_lower == 0 &&
- pio_sgl->sgl_pair->next_pair_upper == 0) {
- current_sgl = NULL;
+ if (sgl_pair->next_pair_lower == 0 &&
+ sgl_pair->next_pair_upper == 0) {
+ sgl = NULL;
} else {
- u64 phys_addr;
-
- phys_addr = pio_sgl->sgl_pair->next_pair_upper;
- phys_addr <<= 32;
- phys_addr |= pio_sgl->sgl_pair->next_pair_lower;
-
- pio_sgl->sgl_pair = scic_request_get_virt_addr(sci_req, phys_addr);
+ pio_sgl->sgl_index++;
pio_sgl->sgl_set = SCU_SGL_ELEMENT_PAIR_A;
- current_sgl = &pio_sgl->sgl_pair->A;
+ sgl_pair = to_sgl_element_pair(sci_req, pio_sgl->sgl_index);
+ sgl = &sgl_pair->A;
}
}
- return current_sgl;
+ return sgl;
}
static enum sci_status
@@ -1328,21 +1221,19 @@ static enum sci_status scic_sds_stp_request_pio_data_out_trasmit_data_frame(
struct scic_sds_request *sci_req,
u32 length)
{
- struct scic_sds_controller *scic = sci_req->owning_controller;
struct scic_sds_stp_request *stp_req = &sci_req->stp.req;
- struct scu_task_context *task_context;
+ struct scu_task_context *task_context = sci_req->tc;
+ struct scu_sgl_element_pair *sgl_pair;
struct scu_sgl_element *current_sgl;
/* Recycle the TC and reconstruct it for sending out DATA FIS containing
* for the data from current_sgl+offset for the input length
*/
- task_context = scic_sds_controller_get_task_context_buffer(scic,
- sci_req->io_tag);
-
+ sgl_pair = to_sgl_element_pair(sci_req, stp_req->type.pio.request_current.sgl_index);
if (stp_req->type.pio.request_current.sgl_set == SCU_SGL_ELEMENT_PAIR_A)
- current_sgl = &stp_req->type.pio.request_current.sgl_pair->A;
+ current_sgl = &sgl_pair->A;
else
- current_sgl = &stp_req->type.pio.request_current.sgl_pair->B;
+ current_sgl = &sgl_pair->B;
/* update the TC */
task_context->command_iu_upper = current_sgl->address_upper;
@@ -1362,18 +1253,21 @@ static enum sci_status scic_sds_stp_request_pio_data_out_transmit_data(struct sc
u32 remaining_bytes_in_current_sgl = 0;
enum sci_status status = SCI_SUCCESS;
struct scic_sds_stp_request *stp_req = &sci_req->stp.req;
+ struct scu_sgl_element_pair *sgl_pair;
sgl_offset = stp_req->type.pio.request_current.sgl_offset;
+ sgl_pair = to_sgl_element_pair(sci_req, stp_req->type.pio.request_current.sgl_index);
+ if (WARN_ONCE(!sgl_pair, "%s: null sgl element", __func__))
+ return SCI_FAILURE;
if (stp_req->type.pio.request_current.sgl_set == SCU_SGL_ELEMENT_PAIR_A) {
- current_sgl = &(stp_req->type.pio.request_current.sgl_pair->A);
- remaining_bytes_in_current_sgl = stp_req->type.pio.request_current.sgl_pair->A.length - sgl_offset;
+ current_sgl = &sgl_pair->A;
+ remaining_bytes_in_current_sgl = sgl_pair->A.length - sgl_offset;
} else {
- current_sgl = &(stp_req->type.pio.request_current.sgl_pair->B);
- remaining_bytes_in_current_sgl = stp_req->type.pio.request_current.sgl_pair->B.length - sgl_offset;
+ current_sgl = &sgl_pair->B;
+ remaining_bytes_in_current_sgl = sgl_pair->B.length - sgl_offset;
}
-
if (stp_req->type.pio.pio_transfer_bytes > 0) {
if (stp_req->type.pio.pio_transfer_bytes >= remaining_bytes_in_current_sgl) {
/* recycle the TC and send the H2D Data FIS from (current sgl + sgl_offset) and length = remaining_bytes_in_current_sgl */
@@ -1382,7 +1276,7 @@ static enum sci_status scic_sds_stp_request_pio_data_out_transmit_data(struct sc
stp_req->type.pio.pio_transfer_bytes -= remaining_bytes_in_current_sgl;
/* update the current sgl, sgl_offset and save for future */
- current_sgl = scic_sds_stp_request_pio_get_next_sgl(stp_req);
+ current_sgl = pio_sgl_next(stp_req);
sgl_offset = 0;
}
} else if (stp_req->type.pio.pio_transfer_bytes < remaining_bytes_in_current_sgl) {
@@ -1945,7 +1839,7 @@ scic_sds_io_request_frame_handler(struct scic_sds_request *sci_req,
return status;
}
- if (stp_req->type.pio.request_current.sgl_pair == NULL) {
+ if (stp_req->type.pio.request_current.sgl_index < 0) {
sci_req->saved_rx_frame_index = frame_index;
stp_req->type.pio.pio_transfer_bytes = 0;
} else {
@@ -2977,8 +2871,6 @@ static void isci_request_io_request_complete(struct isci_host *isci_host,
* task to recognize the already completed case.
*/
request->terminated = true;
-
- isci_host_can_dequeue(isci_host, 1);
}
static void scic_sds_request_started_state_enter(struct sci_base_state_machine *sm)
@@ -3039,7 +2931,7 @@ static void scic_sds_request_aborting_state_enter(struct sci_base_state_machine
struct scic_sds_request *sci_req = container_of(sm, typeof(*sci_req), sm);
/* Setting the abort bit in the Task Context is required by the silicon. */
- sci_req->task_context_buffer->abort = 1;
+ sci_req->tc->abort = 1;
}
static void scic_sds_stp_request_started_non_data_await_h2d_completion_enter(struct sci_base_state_machine *sm)
@@ -3069,7 +2961,7 @@ static void scic_sds_stp_request_started_soft_reset_await_h2d_asserted_completio
static void scic_sds_stp_request_started_soft_reset_await_h2d_diagnostic_completion_enter(struct sci_base_state_machine *sm)
{
struct scic_sds_request *sci_req = container_of(sm, typeof(*sci_req), sm);
- struct scu_task_context *task_context;
+ struct scu_task_context *tc = sci_req->tc;
struct host_to_dev_fis *h2d_fis;
enum sci_status status;
@@ -3078,9 +2970,7 @@ static void scic_sds_stp_request_started_soft_reset_await_h2d_diagnostic_complet
h2d_fis->control = 0;
/* Clear the TC control bit */
- task_context = scic_sds_controller_get_task_context_buffer(
- sci_req->owning_controller, sci_req->io_tag);
- task_context->control_frame = 0;
+ tc->control_frame = 0;
status = scic_controller_continue_io(sci_req);
WARN_ONCE(status != SCI_SUCCESS, "isci: continue io failure\n");
@@ -3141,18 +3031,10 @@ scic_sds_general_request_construct(struct scic_sds_controller *scic,
sci_req->sci_status = SCI_SUCCESS;
sci_req->scu_status = 0;
sci_req->post_context = 0xFFFFFFFF;
+ sci_req->tc = &scic->task_context_table[ISCI_TAG_TCI(io_tag)];
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 = &sci_req->tc;
- } else {
- sci_req->was_tag_assigned_by_user = true;
-
- sci_req->task_context_buffer =
- scic_sds_controller_get_task_context_buffer(scic, io_tag);
- }
+ WARN_ONCE(io_tag == SCI_CONTROLLER_INVALID_IO_TAG, "straggling invalid tag usage\n");
}
static enum sci_status
@@ -3178,8 +3060,7 @@ scic_io_request_construct(struct scic_sds_controller *scic,
else
return SCI_FAILURE_UNSUPPORTED_PROTOCOL;
- memset(sci_req->task_context_buffer, 0,
- offsetof(struct scu_task_context, sgl_pair_ab));
+ memset(sci_req->tc, 0, offsetof(struct scu_task_context, sgl_pair_ab));
return status;
}
@@ -3197,7 +3078,7 @@ enum sci_status scic_task_request_construct(struct scic_sds_controller *scic,
if (dev->dev_type == SAS_END_DEV ||
dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) {
sci_req->is_task_management_request = true;
- memset(sci_req->task_context_buffer, 0, sizeof(struct scu_task_context));
+ memset(sci_req->tc, 0, sizeof(struct scu_task_context));
} else
status = SCI_FAILURE_UNSUPPORTED_PROTOCOL;
@@ -3299,7 +3180,7 @@ scic_io_request_construct_smp(struct device *dev,
/* byte swap the smp request. */
- task_context = scic_sds_request_get_task_context(sci_req);
+ task_context = sci_req->tc;
sci_dev = scic_sds_request_get_device(sci_req);
sci_port = scic_sds_request_get_port(sci_req);
@@ -3354,33 +3235,12 @@ scic_io_request_construct_smp(struct device *dev,
*/
task_context->task_phase = 0;
- if (sci_req->was_tag_assigned_by_user) {
- /*
- * Build the task context now since we have already read
- * the data
- */
- sci_req->post_context =
- (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
- (scic_sds_controller_get_protocol_engine_group(scic) <<
- SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
- (scic_sds_port_get_index(sci_port) <<
- SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
- ISCI_TAG_TCI(sci_req->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.
- */
- sci_req->post_context =
- (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
- (scic_sds_controller_get_protocol_engine_group(scic) <<
- SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
- (scic_sds_port_get_index(sci_port) <<
- SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT));
- }
-
+ sci_req->post_context = (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
+ (scic_sds_controller_get_protocol_engine_group(scic) <<
+ SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
+ (scic_sds_port_get_index(sci_port) <<
+ SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
+ ISCI_TAG_TCI(sci_req->io_tag));
/*
* Copy the physical address for the command buffer to the SCU Task
* Context command buffer should not contain command header.
@@ -3431,10 +3291,10 @@ static enum sci_status isci_smp_request_build(struct isci_request *ireq)
*
* 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 enum sci_status isci_io_request_build(struct isci_host *isci_host,
+ struct isci_request *request,
+ struct isci_remote_device *isci_device,
+ u16 tag)
{
enum sci_status status = SCI_SUCCESS;
struct sas_task *task = isci_request_access_task(request);
@@ -3471,8 +3331,7 @@ static enum sci_status isci_io_request_build(
* 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);
+ tag, &request->sci);
if (status != SCI_SUCCESS) {
dev_warn(&isci_host->pdev->dev,
@@ -3564,7 +3423,7 @@ struct isci_request *isci_request_alloc_tmf(struct isci_host *ihost,
}
int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *idev,
- struct sas_task *task, gfp_t gfp_flags)
+ struct sas_task *task, u16 tag, gfp_t gfp_flags)
{
enum sci_status status = SCI_FAILURE_UNSUPPORTED_PROTOCOL;
struct isci_request *ireq;
@@ -3576,7 +3435,7 @@ int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *ide
if (!ireq)
goto out;
- status = isci_io_request_build(ihost, ireq, idev);
+ status = isci_io_request_build(ihost, ireq, idev, tag);
if (status != SCI_SUCCESS) {
dev_warn(&ihost->pdev->dev,
"%s: request_construct failed - status = 0x%x\n",
@@ -3599,18 +3458,16 @@ int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *ide
*/
status = scic_controller_start_task(&ihost->sci,
&idev->sci,
- &ireq->sci,
- SCI_CONTROLLER_INVALID_IO_TAG);
+ &ireq->sci);
} else {
status = SCI_FAILURE;
}
} else {
-
/* send the request, let the core assign the IO TAG. */
status = scic_controller_start_io(&ihost->sci, &idev->sci,
- &ireq->sci,
- SCI_CONTROLLER_INVALID_IO_TAG);
+ &ireq->sci);
}
+
if (status != SCI_SUCCESS &&
status != SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) {
dev_warn(&ihost->pdev->dev,
@@ -3647,23 +3504,23 @@ int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *ide
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.
- */
+ * 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.
- */
+ * handler thread.
+ */
isci_execpath_callback(ihost, task,
sas_task_abort);
/* Change the status, since we are holding
- * the I/O until it is managed by the SCSI
- * error handler.
- */
+ * the I/O until it is managed by the SCSI
+ * error handler.
+ */
status = SCI_SUCCESS;
}

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