isci: unify request data structures

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, 128 insertions, 257 deletions

diff --git a/drivers/scsi/isci/core/sci_util.c b/drivers/scsi/isci/core/sci_util.c
index 0c75d14240a1..4e60d55836e9 100644
--- a/drivers/scsi/isci/core/sci_util.c
+++ b/drivers/scsi/isci/core/sci_util.c
@@ -59,14 +59,14 @@
 
 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);
 }
diff --git a/drivers/scsi/isci/core/sci_util.h b/drivers/scsi/isci/core/sci_util.h
index 4e9c3189cf95..0f9dd0fe1266 100644
--- a/drivers/scsi/isci/core/sci_util.h
+++ b/drivers/scsi/isci/core/sci_util.h
@@ -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)
 
diff --git a/drivers/scsi/isci/core/scic_io_request.h b/drivers/scsi/isci/core/scic_io_request.h
index cb3667decb3c..f7c6d426f8c0 100644
--- a/drivers/scsi/isci/core/scic_io_request.h
+++ b/drivers/scsi/isci/core/scic_io_request.h
@@ -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
diff --git a/drivers/scsi/isci/core/scic_sds_controller.c b/drivers/scsi/isci/core/scic_sds_controller.c
index 4179bdf3eda7..852b7d52f84f 100644
--- a/drivers/scsi/isci/core/scic_sds_controller.c
+++ b/drivers/scsi/isci/core/scic_sds_controller.c
@@ -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
diff --git a/drivers/scsi/isci/core/scic_sds_request.c b/drivers/scsi/isci/core/scic_sds_request.c
index 36c2b310c175..50dd19bba3db 100644
--- a/drivers/scsi/isci/core/scic_sds_request.c
+++ b/drivers/scsi/isci/core/scic_sds_request.c
@@ -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;
diff --git a/drivers/scsi/isci/core/scic_sds_request.h b/drivers/scsi/isci/core/scic_sds_request.h
index 3f551eaf3dfa..1dd98aabe32d 100644
--- a/drivers/scsi/isci/core/scic_sds_request.h
+++ b/drivers/scsi/isci/core/scic_sds_request.h
@@ -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.
diff --git a/drivers/scsi/isci/core/scic_sds_stp_request.c b/drivers/scsi/isci/core/scic_sds_stp_request.c
index c7a8931a3bcb..2677393db6f4 100644
--- a/drivers/scsi/isci/core/scic_sds_stp_request.c
+++ b/drivers/scsi/isci/core/scic_sds_stp_request.c
@@ -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;
diff --git a/drivers/scsi/isci/core/scic_task_request.h b/drivers/scsi/isci/core/scic_task_request.h
index 7e6d20aa0f02..98cfaa9e6d38 100644
--- a/drivers/scsi/isci/core/scic_task_request.h
+++ b/drivers/scsi/isci/core/scic_task_request.h
@@ -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
diff --git a/drivers/scsi/isci/host.c b/drivers/scsi/isci/host.c
index 4d0ee7bf847b..271a7e171e7d 100644
--- a/drivers/scsi/isci/host.c
+++ b/drivers/scsi/isci/host.c
@@ -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)
diff --git a/drivers/scsi/isci/host.h b/drivers/scsi/isci/host.h
index 5a414c31a877..afa41e83eaa7 100644
--- a/drivers/scsi/isci/host.h
+++ b/drivers/scsi/isci/host.h
@@ -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;
diff --git a/drivers/scsi/isci/remote_device.c b/drivers/scsi/isci/remote_device.c
index a441c23b6859..8b1ef19a6732 100644
--- a/drivers/scsi/isci/remote_device.c
+++ b/drivers/scsi/isci/remote_device.c
@@ -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) {
diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c
index a5b9b22d3b3a..4961ee347091 100644
--- a/drivers/scsi/isci/request.c
+++ b/drivers/scsi/isci/request.c
@@ -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);
 }
diff --git a/drivers/scsi/isci/request.h b/drivers/scsi/isci/request.h
index ddfbf71c97e5..89d8b0a27dfe 100644
--- a/drivers/scsi/isci/request.h
+++ b/drivers/scsi/isci/request.h
@@ -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
diff --git a/drivers/scsi/isci/sata.c b/drivers/scsi/isci/sata.c
index 578b1c5d40a9..08dabf08f7d7 100644
--- a/drivers/scsi/isci/sata.c
+++ b/drivers/scsi/isci/sata.c
@@ -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;
 }
diff --git a/drivers/scsi/isci/task.c b/drivers/scsi/isci/task.c
index 492faeea8b3a..7adaf71c19d1 100644
--- a/drivers/scsi/isci/task.c
+++ b/drivers/scsi/isci/task.c
@@ -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);