isci: unify request data structures
authorDan Williams <dan.j.williams@intel.com>
Sun, 8 May 2011 18:47:15 +0000 (11:47 -0700)
committerDan Williams <dan.j.williams@intel.com>
Sun, 3 Jul 2011 11:04:47 +0000 (04:04 -0700)
Make scic_sds_request a proper member of isci_request.  Also let's us
get rid of the dma pool object size tracking since we now know that all
requests are sizeof(isci_request).  While cleaning up the construct
routine incidentally replaced SCI_FIELD_OFFSET with offsetof.

Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
15 files changed:
drivers/scsi/isci/core/sci_util.c
drivers/scsi/isci/core/sci_util.h
drivers/scsi/isci/core/scic_io_request.h
drivers/scsi/isci/core/scic_sds_controller.c
drivers/scsi/isci/core/scic_sds_request.c
drivers/scsi/isci/core/scic_sds_request.h
drivers/scsi/isci/core/scic_sds_stp_request.c
drivers/scsi/isci/core/scic_task_request.h
drivers/scsi/isci/host.c
drivers/scsi/isci/host.h
drivers/scsi/isci/remote_device.c
drivers/scsi/isci/request.c
drivers/scsi/isci/request.h
drivers/scsi/isci/sata.c
drivers/scsi/isci/task.c

index 0c75d14..4e60d55 100644 (file)
 
 void *scic_request_get_virt_addr(struct scic_sds_request *sci_req, dma_addr_t phys_addr)
 {
-       struct isci_request *ireq = sci_req->ireq;
+       struct isci_request *ireq = sci_req_to_ireq(sci_req);
        dma_addr_t offset;
 
        BUG_ON(phys_addr < ireq->request_daddr);
 
        offset = phys_addr - ireq->request_daddr;
 
-       BUG_ON(offset >= ireq->request_alloc_size);
+       BUG_ON(offset >= sizeof(*ireq));
 
        return (char *)ireq + offset;
 }
@@ -74,14 +74,13 @@ void *scic_request_get_virt_addr(struct scic_sds_request *sci_req, dma_addr_t ph
 dma_addr_t scic_io_request_get_dma_addr(struct scic_sds_request *sds_request,
                                        void *virt_addr)
 {
-       struct isci_request *isci_request = sds_request->ireq;
+       struct isci_request *isci_request = sci_req_to_ireq(sds_request);
 
        char *requested_addr = (char *)virt_addr;
        char *base_addr = (char *)isci_request;
 
        BUG_ON(requested_addr < base_addr);
-       BUG_ON((requested_addr - base_addr) >=
-                       isci_request->request_alloc_size);
+       BUG_ON((requested_addr - base_addr) >= sizeof(*isci_request));
 
        return isci_request->request_daddr + (requested_addr - base_addr);
 }
index 4e9c318..0f9dd0f 100644 (file)
@@ -66,9 +66,6 @@
                | ((char_buffer)[3]) \
        )
 
-#define SCI_FIELD_OFFSET(type, field)   ((unsigned long)&(((type *)0)->field))
-
-
 #define sci_cb_make_physical_address(physical_addr, addr_upper, addr_lower) \
        ((physical_addr) = (addr_lower) | ((u64)addr_upper) << 32)
 
index cb3667d..f7c6d42 100644 (file)
@@ -102,41 +102,10 @@ typedef enum {
 
 } SCIC_TRANSPORT_PROTOCOL;
 
-
-/**
- * scic_io_request_construct() - This method is called by the SCI user to
- *    construct all SCI Core IO requests.  Memory initialization and
- *    functionality common to all IO request types is performed in this method.
- * @scic_controller: the handle to the core controller object for which to
- *    build an IO request.
- * @scic_remote_device: the handle to the core remote device object for which
- *    to build an IO request.
- * @io_tag: This parameter specifies the IO tag to be associated with this
- *    request.  If SCI_CONTROLLER_INVALID_IO_TAG is passed, then a copy of the
- *    request is built internally.  The request will be copied into the actual
- *    controller request memory when the IO tag is allocated internally during
- *    the scic_controller_start_io() method.
- * @user_io_request_object: This parameter specifies the user IO request to be
- *    utilized during IO construction.  This IO pointer will become the
- *    associated object for the core IO request object.
- * @scic_io_request_memory: This parameter specifies the memory location to be
- *    utilized when building the core request.
- * @new_scic_io_request_handle: This parameter specifies a pointer to the
- *    handle the core will expect in further interactions with the core IO
- *    request object.
- *
- * The SCI core implementation will create an association between the user IO
- * request object and the core IO request object. Indicate if the controller
- * successfully built the IO request. SCI_SUCCESS This value is returned if the
- * IO request was successfully built.
- */
 enum sci_status scic_io_request_construct(
        struct scic_sds_controller *scic_controller,
        struct scic_sds_remote_device *scic_remote_device,
-       u16 io_tag,
-       void *user_io_request_object,
-       struct scic_sds_request *scic_io_request_memory,
-       struct scic_sds_request **new_scic_io_request_handle);
+       u16 io_tag, struct scic_sds_request *sci_req);
 
 /**
  * scic_io_request_construct_basic_ssp() - This method is called by the SCI
index 4179bdf..852b7d5 100644 (file)
@@ -1572,7 +1572,7 @@ void scic_sds_controller_copy_task_context(
 
        memcpy(task_context_buffer,
               sci_req->task_context_buffer,
-              SCI_FIELD_OFFSET(struct scu_task_context, sgl_snapshot_ac));
+              offsetof(struct scu_task_context, sgl_snapshot_ac));
 
        /*
         * Now that the soft copy of the TC has been copied into the TC
index 36c2b31..50dd19b 100644 (file)
@@ -117,7 +117,7 @@ static struct scu_sgl_element_pair *scic_sds_request_get_sgl_element_pair(
  */
 void scic_sds_request_build_sgl(struct scic_sds_request *sds_request)
 {
-       struct isci_request *isci_request = sds_request->ireq;
+       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;
@@ -190,7 +190,7 @@ static void scic_sds_ssp_io_request_assign_buffers(struct scic_sds_request *sci_
 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->ireq;
+       struct isci_request *ireq = sci_req_to_ireq(sci_req);
        struct sas_task *task = isci_request_access_task(ireq);
 
        cmd_iu = &sci_req->ssp.cmd;
@@ -211,7 +211,7 @@ static void scic_sds_io_request_build_ssp_command_iu(struct scic_sds_request *sc
 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->ireq;
+       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);
 
@@ -429,7 +429,7 @@ scic_io_request_construct_sata(struct scic_sds_request *sci_req,
                               bool copy)
 {
        enum sci_status status = SCI_SUCCESS;
-       struct isci_request *ireq = sci_req->ireq;
+       struct isci_request *ireq = sci_req_to_ireq(sci_req);
        struct sas_task *task = isci_request_access_task(ireq);
 
        /* check for management protocols */
@@ -478,7 +478,7 @@ scic_io_request_construct_sata(struct scic_sds_request *sci_req,
 enum sci_status scic_io_request_construct_basic_ssp(
        struct scic_sds_request *sci_req)
 {
-       struct isci_request *ireq = sci_req->ireq;
+       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;
@@ -519,7 +519,7 @@ enum sci_status scic_io_request_construct_basic_sata(
        enum sci_status status;
        struct scic_sds_stp_request *stp_req;
        bool copy = false;
-       struct isci_request *isci_request = sci_req->ireq;
+       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;
@@ -540,11 +540,10 @@ enum sci_status scic_io_request_construct_basic_sata(
 }
 
 
-enum sci_status scic_task_request_construct_sata(
-       struct scic_sds_request *sci_req)
+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->ireq;
+       struct isci_request *ireq = sci_req_to_ireq(sci_req);
 
        /* check for management protocols */
        if (ireq->ttype == tmf_task) {
@@ -740,7 +739,7 @@ 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->ireq;
+       struct isci_request *ireq = sci_req_to_ireq(sci_req);
        struct isci_tmf *isci_tmf = isci_request_access_tmf(ireq);
 
        ssp_response = &sci_req->ssp.rsp;
@@ -1342,7 +1341,7 @@ static void scic_sds_request_completed_state_enter(void *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->ireq;
+       struct isci_request *ireq = sci_req_to_ireq(sci_req);
 
        SET_STATE_HANDLER(sci_req,
                          scic_sds_request_state_handler_table,
@@ -1424,16 +1423,13 @@ static const struct sci_base_state scic_sds_request_state_table[] = {
 
 static void scic_sds_general_request_construct(struct scic_sds_controller *scic,
                                               struct scic_sds_remote_device *sci_dev,
-                                              u16 io_tag,
-                                              void *user_io_request_object,
-                                              struct scic_sds_request *sci_req)
+                                              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->user_request = user_io_request_object;
        sci_req->owning_controller = scic;
        sci_req->target_device = sci_dev;
        sci_req->has_started_substate_machine = false;
@@ -1461,20 +1457,13 @@ static void scic_sds_general_request_construct(struct scic_sds_controller *scic,
 enum sci_status
 scic_io_request_construct(struct scic_sds_controller *scic,
                          struct scic_sds_remote_device *sci_dev,
-                         u16 io_tag,
-                         void *user_req,
-                         struct scic_sds_request *sci_req,
-                         struct scic_sds_request **new_sci_req)
+                         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,
-                                          user_req,
-                                          sci_req);
+       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)
@@ -1493,10 +1482,8 @@ scic_io_request_construct(struct scic_sds_controller *scic,
                status = SCI_FAILURE_UNSUPPORTED_PROTOCOL;
 
        if (status == SCI_SUCCESS) {
-               memset(sci_req->task_context_buffer,
-                      0,
-                      SCI_FIELD_OFFSET(struct scu_task_context, sgl_pair_ab));
-               *new_sci_req = sci_req;
+               memset(sci_req->task_context_buffer, 0,
+                      offsetof(struct scu_task_context, sgl_pair_ab));
        }
 
        return status;
@@ -1504,18 +1491,13 @@ scic_io_request_construct(struct scic_sds_controller *scic,
 
 enum sci_status scic_task_request_construct(struct scic_sds_controller *scic,
                                            struct scic_sds_remote_device *sci_dev,
-                                           u16 io_tag,
-                                           void *user_io_request_object,
-                                           struct scic_sds_request *sci_req,
-                                           struct scic_sds_request **new_sci_req)
+                                           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,
-                                          user_io_request_object,
-                                          sci_req);
+       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);
@@ -1537,7 +1519,6 @@ enum sci_status scic_task_request_construct(struct scic_sds_controller *scic,
        if (status == SCI_SUCCESS) {
                sci_req->is_task_management_request = true;
                memset(sci_req->task_context_buffer, 0, sizeof(struct scu_task_context));
-               *new_sci_req = sci_req;
        }
 
        return status;
index 3f551ea..1dd98aa 100644 (file)
@@ -113,26 +113,12 @@ enum scic_sds_smp_request_started_substates {
        SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_COMPLETION,
 };
 
-struct isci_request;
-/**
- * struct scic_sds_request - This structure contains or references all of
- *    the data necessary to process a task management or normal IO request.
- *
- *
- */
 struct scic_sds_request {
-       /**
-        * The field specifies that the peer object for the request object.
-        */
-       struct isci_request *ireq;
-
        /**
         * This field contains the information for the base request state machine.
         */
        struct sci_base_state_machine state_machine;
 
-       void *user_request;
-
        /**
         * This field simply points to the controller to which this IO request
         * is associated.
index c7a8931..2677393 100644 (file)
@@ -627,7 +627,7 @@ scic_sds_stp_request_pio_data_in_copy_data_buffer(struct scic_sds_stp_request *s
        int total_len = len;
 
        sci_req = to_sci_req(stp_req);
-       ireq = scic_sds_request_get_user_request(sci_req);
+       ireq = sci_req_to_ireq(sci_req);
        task = isci_request_access_task(ireq);
        src_addr = data_buf;
 
@@ -737,7 +737,7 @@ static enum sci_status scic_sds_stp_request_pio_await_frame_frame_handler(struct
 {
        struct scic_sds_controller *scic = sci_req->owning_controller;
        struct scic_sds_stp_request *stp_req = &sci_req->stp.req;
-       struct isci_request *ireq = sci_req->ireq;
+       struct isci_request *ireq = sci_req_to_ireq(sci_req);
        struct sas_task *task = isci_request_access_task(ireq);
        struct dev_to_host_fis *frame_header;
        enum sci_status status;
index 7e6d20a..98cfaa9 100644 (file)
@@ -72,44 +72,10 @@ struct scic_sds_remote_device;
 struct scic_sds_controller;
 
 
-/**
- * scic_task_request_construct() - This method is called by the SCI user to
- *    construct all SCI Core task management requests, regardless of protocol.
- *    Memory initialization and functionality common to all task request types
- *    is performed in this method.
- * @scic_controller: the handle to the core controller object for which to
- *    build the task managmement request.
- * @scic_remote_device: the handle to the core remote device object for which
- *    to build the task management request. passed, then a copy of the request
- *    is built internally.  The request will be copied into the actual
- *    controller request memory when the task is allocated internally during
- *    the scic_controller_start_task() method.
- * @io_tag: This parameter specifies the IO tag to be associated with this
- *    request.  If SCI_CONTROLLER_INVALID_IO_TAG is passed, then a copy of the
- *    request is built internally.  The request will be copied into the actual
- *    controller request memory when the IO tag is allocated internally during
- *    the scic_controller_start_io() method.
- * @user_task_request_object: This parameter specifies the user task request to
- *    be utilized during construction.  This task pointer will become the
- *    associated object for the core task request object.
- * @scic_task_request_memory: This parameter specifies the memory location to
- *    be utilized when building the core request.
- * @new_scic_task_request_handle: This parameter specifies a pointer to the
- *    handle the core will expect in further interactions with the core task
- *    request object.
- *
- * The SCI core implementation will create an association between the user task
- * request object and the core task request object. Indicate if the controller
- * successfully built the task request. SCI_SUCCESS This value is returned if
- * the task request was successfully built.
- */
 enum sci_status scic_task_request_construct(
        struct scic_sds_controller *scic_controller,
        struct scic_sds_remote_device *scic_remote_device,
-       u16 io_tag,
-       void *user_task_request_object,
-       void *scic_task_request_memory,
-       struct scic_sds_request **new_scic_task_request_handle);
+       u16 io_tag, struct scic_sds_request *sci_req);
 
 /**
  * scic_task_request_construct_ssp() - This method is called by the SCI user to
index 4d0ee7b..271a7e1 100644 (file)
@@ -428,14 +428,8 @@ int isci_host_init(struct isci_host *isci_host)
        if (err)
                return err;
 
-       /*
-        * keep the pool alloc size around, will use it for a bounds checking
-        * when trying to convert virtual addresses to physical addresses
-        */
-       isci_host->dma_pool_alloc_size = sizeof(struct isci_request) +
-                                        sizeof(struct scic_sds_request);
        isci_host->dma_pool = dmam_pool_create(DRV_NAME, &isci_host->pdev->dev,
-                                              isci_host->dma_pool_alloc_size,
+                                              sizeof(struct isci_request),
                                               SLAB_HWCACHE_ALIGN, 0);
 
        if (!isci_host->dma_pool)
index 5a414c3..afa41e8 100644 (file)
@@ -82,7 +82,6 @@ struct isci_host {
        struct list_head timers;
        void *core_ctrl_memory;
        struct dma_pool *dma_pool;
-       unsigned int dma_pool_alloc_size;
        struct isci_phy phys[SCI_MAX_PHYS];
        struct isci_port ports[SCI_MAX_PORTS + 1]; /* includes dummy port */
        struct sas_ha_struct sas_ha;
index a441c23..8b1ef19 100644 (file)
@@ -473,7 +473,7 @@ enum sci_status scic_sds_remote_device_start_io(struct scic_sds_controller *scic
        struct sci_base_state_machine *sm = &sci_dev->state_machine;
        enum scic_sds_remote_device_states state = sm->current_state_id;
        struct scic_sds_port *sci_port = sci_dev->owning_port;
-       struct isci_request *ireq = sci_req->ireq;
+       struct isci_request *ireq = sci_req_to_ireq(sci_req);
        enum sci_status status;
 
        switch (state) {
index a5b9b22..4961ee3 100644 (file)
@@ -73,9 +73,7 @@ static enum sci_status isci_request_ssp_request_construct(
                "%s: request = %p\n",
                __func__,
                request);
-       status = scic_io_request_construct_basic_ssp(
-               request->sci_request_handle
-               );
+       status = scic_io_request_construct_basic_ssp(&request->sci);
        return status;
 }
 
@@ -96,9 +94,7 @@ static enum sci_status isci_request_stp_request_construct(
         */
        register_fis = isci_sata_task_to_fis_copy(task);
 
-       status = scic_io_request_construct_basic_sata(
-               request->sci_request_handle
-               );
+       status = scic_io_request_construct_basic_sata(&request->sci);
 
        /* Set the ncq tag in the fis, from the queue
         * command in the task.
@@ -125,7 +121,7 @@ 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_request_handle;
+       struct scic_sds_request *sci_req = &ireq->sci;
 
        dev_dbg(&ireq->isci_host->pdev->dev,
                "%s: request = %p\n", __func__, ireq);
@@ -201,8 +197,7 @@ static enum sci_status isci_io_request_build(
         */
        status = scic_io_request_construct(&isci_host->sci, sci_device,
                                           SCI_CONTROLLER_INVALID_IO_TAG,
-                                          request, request->sci_req,
-                                          &request->sci_request_handle);
+                                          &request->sci);
 
        if (status != SCI_SUCCESS) {
                dev_warn(&isci_host->pdev->dev,
@@ -211,8 +206,6 @@ static enum sci_status isci_io_request_build(
                return SCI_FAILURE;
        }
 
-       request->sci_request_handle->ireq = request;
-
        switch (task->task_proto) {
        case SAS_PROTOCOL_SMP:
                status = isci_smp_request_build(request);
@@ -276,8 +269,8 @@ static int isci_request_alloc_core(
        request->isci_host = isci_host;
        request->isci_device = isci_device;
        request->io_request_completion = NULL;
+       request->terminated = false;
 
-       request->request_alloc_size = isci_host->dma_pool_alloc_size;
        request->num_sg_entries = 0;
 
        request->complete_in_target = false;
@@ -381,80 +374,74 @@ int isci_request_execute(
                goto out;
 
        status = isci_io_request_build(isci_host, request, isci_device);
-       if (status == SCI_SUCCESS) {
-
-               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_request_handle,
-                       SCI_CONTROLLER_INVALID_IO_TAG
-                       );
-
-               if (status == SCI_SUCCESS ||
-                   status == SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) {
-
-                       /* 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 = scic_io_request_get_io_tag(
-                                                    request->sci_request_handle);
-                       } else {
-                               /* The request did not really start in the
-                                * hardware, so clear the request handle
-                                * here so no terminations will be done.
-                                */
-                               request->sci_request_handle = NULL;
-                       }
+       if (status != SCI_SUCCESS) {
+               dev_warn(&isci_host->pdev->dev,
+                        "%s: request_construct failed - status = 0x%x\n",
+                        __func__,
+                        status);
+               goto out;
+       }
 
-               } else
-                       dev_warn(&isci_host->pdev->dev,
-                                "%s: failed request start (0x%x)\n",
-                                __func__, status);
+       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;
+       }
 
-               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;
-               }
+       /* 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);
 
-       } else
-               dev_warn(&isci_host->pdev->dev,
-                        "%s: request_construct failed - status = 0x%x\n",
-                        __func__,
-                        status);
+       if (status == SCI_SUCCESS) {
+               /* Save the tag for possible task mgmt later. */
+               request->io_tag = scic_io_request_get_io_tag(&request->sci);
+       } else {
+               /* The request did not really start in the
+                * hardware, so clear the request handle
+                * here so no terminations will be done.
+                */
+               request->terminated = true;
+       }
+       spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+
+       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) {
@@ -554,9 +541,7 @@ static void isci_request_handle_controller_specific_errors(
 {
        unsigned int cstatus;
 
-       cstatus = scic_request_get_controller_status(
-               request->sci_request_handle
-               );
+       cstatus = scic_request_get_controller_status(&request->sci);
 
        dev_dbg(&request->isci_host->pdev->dev,
                "%s: %p SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR "
@@ -997,13 +982,13 @@ void isci_request_io_request_complete(
                                task);
 
                        if (sas_protocol_ata(task->task_proto)) {
-                               resp_buf = &request->sci_request_handle->stp.rsp;
+                               resp_buf = &request->sci.stp.rsp;
                                isci_request_process_stp_response(task,
                                                                  resp_buf);
                        } else if (SAS_PROTOCOL_SSP == task->task_proto) {
 
                                /* crack the iu response buffer. */
-                               resp_iu = &request->sci_request_handle->ssp.rsp;
+                               resp_iu = &request->sci.ssp.rsp;
                                isci_request_process_response_iu(task, resp_iu,
                                                                 &isci_host->pdev->dev);
 
@@ -1034,7 +1019,7 @@ void isci_request_io_request_complete(
                        request->complete_in_target = true;
 
                        if (task->task_proto == SAS_PROTOCOL_SMP) {
-                               void *rsp = &request->sci_request_handle->smp.rsp;
+                               void *rsp = &request->sci.smp.rsp;
 
                                dev_dbg(&isci_host->pdev->dev,
                                        "%s: SMP protocol completion\n",
@@ -1051,8 +1036,7 @@ void isci_request_io_request_complete(
                                 * the maximum was transferred.
                                 */
                                u32 transferred_length
-                                       = scic_io_request_get_number_of_bytes_transferred(
-                                       request->sci_request_handle);
+                                       = scic_io_request_get_number_of_bytes_transferred(&request->sci);
 
                                task->task_status.residual
                                        = task->total_xfer_len - transferred_length;
@@ -1165,12 +1149,12 @@ void isci_request_io_request_complete(
        /* complete the io request to the core. */
        scic_controller_complete_io(&isci_host->sci,
                                    &isci_device->sci,
-                                   request->sci_request_handle);
-       /* NULL the request handle so it cannot be completed or
+                                   &request->sci);
+       /* set terminated handle so it cannot be completed or
         * terminated again, and to cause any calls into abort
         * task to recognize the already completed case.
         */
-       request->sci_request_handle = NULL;
+       request->terminated = true;
 
        isci_host_can_dequeue(isci_host, 1);
 }
index ddfbf71..89d8b0a 100644 (file)
@@ -82,11 +82,11 @@ enum task_type {
 };
 
 struct isci_request {
-       struct scic_sds_request *sci_request_handle;
        enum isci_request_status status;
        enum task_type ttype;
        unsigned short io_tag;
        bool complete_in_target;
+       bool terminated;
 
        union ttype_ptr_union {
                struct sas_task *io_task_ptr;   /* When ttype==io_task  */
@@ -103,7 +103,6 @@ struct isci_request {
        dma_addr_t zero_scatter_daddr;
 
        unsigned int num_sg_entries;                    /* returned by pci_alloc_sg */
-       unsigned int request_alloc_size;                /* size of block from dma_pool_alloc */
 
        /** Note: "io_request_completion" is completed in two different ways
         * depending on whether this is a TMF or regular request.
@@ -115,9 +114,16 @@ struct isci_request {
         * TMF was aborting is guaranteed to have completed.
         */
        struct completion *io_request_completion;
-       struct scic_sds_request sci_req[0] ____cacheline_aligned;
+       struct scic_sds_request sci;
 };
 
+static inline struct isci_request *sci_req_to_ireq(struct scic_sds_request *sci_req)
+{
+       struct isci_request *ireq = container_of(sci_req, typeof(*ireq), sci);
+
+       return ireq;
+}
+
 /**
  * This function gets the status of the request object.
  * @request: This parameter points to the isci_request object
index 578b1c5..08dabf0 100644 (file)
@@ -72,7 +72,7 @@
 struct host_to_dev_fis *isci_sata_task_to_fis_copy(struct sas_task *task)
 {
        struct isci_request *ireq = task->lldd_task;
-       struct host_to_dev_fis *fis = &ireq->sci_request_handle->stp.cmd;
+       struct host_to_dev_fis *fis = &ireq->sci.stp.cmd;
 
        memcpy(fis, &task->ata_task.fis, sizeof(struct host_to_dev_fis));
 
@@ -118,7 +118,7 @@ void isci_sata_set_ncq_tag(
        struct isci_request *request = task->lldd_task;
 
        register_fis->sector_count = qc->tag << 3;
-       scic_stp_io_request_set_ncq_tag(request->sci_request_handle, qc->tag);
+       scic_stp_io_request_set_ncq_tag(&request->sci, qc->tag);
 }
 
 /**
@@ -156,7 +156,7 @@ void isci_request_process_stp_response(struct sas_task *task,
 
 enum sci_status isci_sata_management_task_request_build(struct isci_request *ireq)
 {
-       struct scic_sds_request *sci_req = ireq->sci_request_handle;
+       struct scic_sds_request *sci_req = &ireq->sci;
        struct isci_tmf *isci_tmf;
        enum sci_status status;
 
@@ -190,9 +190,7 @@ enum sci_status isci_sata_management_task_request_build(struct isci_request *ire
        /* core builds the protocol specific request
         *  based on the h2d fis.
         */
-       status = scic_task_request_construct_sata(
-               ireq->sci_request_handle
-               );
+       status = scic_task_request_construct_sata(&ireq->sci);
 
        return status;
 }
index 492faee..7adaf71 100644 (file)
@@ -300,8 +300,7 @@ static enum sci_status isci_task_request_build(
        /* let the core do it's construct. */
        status = scic_task_request_construct(&isci_host->sci, sci_device,
                                             SCI_CONTROLLER_INVALID_IO_TAG,
-                                            request, &request->sci_req,
-                                            &request->sci_request_handle);
+                                            &request->sci);
 
        if (status != SCI_SUCCESS) {
                dev_warn(&isci_host->pdev->dev,
@@ -312,14 +311,10 @@ static enum sci_status isci_task_request_build(
                goto errout;
        }
 
-       request->sci_request_handle->ireq =  request;
-
        /* XXX convert to get this from task->tproto like other drivers */
        if (dev->dev_type == SAS_END_DEV) {
                isci_tmf->proto = SAS_PROTOCOL_SSP;
-               status = scic_task_request_construct_ssp(
-                       request->sci_request_handle
-                       );
+               status = scic_task_request_construct_ssp(&request->sci);
                if (status != SCI_SUCCESS)
                        goto errout;
        }
@@ -376,8 +371,7 @@ static void isci_tmf_timeout_cb(void *tmf_request_arg)
                status = scic_controller_terminate_request(
                        &request->isci_host->sci,
                        &request->isci_device->sci,
-                       request->sci_request_handle
-                       );
+                       &request->sci);
 
                dev_dbg(&request->isci_host->pdev->dev,
                        "%s: tmf_request = %p; tmf = %p; status = %d\n",
@@ -467,9 +461,8 @@ int isci_task_execute_tmf(
        status = scic_controller_start_task(
                &isci_host->sci,
                sci_device,
-               request->sci_request_handle,
-               SCI_CONTROLLER_INVALID_IO_TAG
-               );
+               &request->sci,
+               SCI_CONTROLLER_INVALID_IO_TAG);
 
        if (status != SCI_TASK_SUCCESS) {
                dev_warn(&isci_host->pdev->dev,
@@ -764,13 +757,13 @@ static void isci_terminate_request_core(
         * device condition (if the request handle is NULL, then the
         * request completed but needed additional handling here).
         */
-       if (isci_request->sci_request_handle != NULL) {
+       if (!isci_request->terminated) {
                was_terminated = true;
                needs_cleanup_handling = true;
                status = scic_controller_terminate_request(
                        &isci_host->sci,
                        &isci_device->sci,
-                       isci_request->sci_request_handle);
+                       &isci_request->sci);
        }
        spin_unlock_irqrestore(&isci_host->scic_lock, flags);
 
@@ -1430,7 +1423,7 @@ isci_task_request_complete(struct isci_host *ihost,
        enum isci_request_status old_state;
        struct isci_tmf *tmf = isci_request_access_tmf(ireq);
        struct completion *tmf_complete;
-       struct scic_sds_request *sci_req = ireq->sci_request_handle;
+       struct scic_sds_request *sci_req = &ireq->sci;
 
        dev_dbg(&ihost->pdev->dev,
                "%s: request = %p, status=%d\n",
@@ -1460,12 +1453,11 @@ isci_task_request_complete(struct isci_host *ihost,
        /* PRINT_TMF( ((struct isci_tmf *)request->task)); */
        tmf_complete = tmf->complete;
 
-       scic_controller_complete_io(&ihost->sci, &idev->sci,
-                                   ireq->sci_request_handle);
-       /* NULL the request handle to make sure it cannot be terminated
+       scic_controller_complete_io(&ihost->sci, &idev->sci, &ireq->sci);
+       /* set the 'terminated' flag handle to make sure it cannot be terminated
         *  or completed again.
         */
-       ireq->sci_request_handle = NULL;
+       ireq->terminated = true;;
 
        isci_request_change_state(ireq, unallocated);
        list_del_init(&ireq->dev_node);