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isci: unify can_queue tracking on the tci_pool, uplevel tag assignment

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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>
This commit is contained in:
Dan Williams 2011-06-28 13:47:09 -07:00
parent 9274f45ea5
commit 312e0c2455
7 changed files with 308 additions and 692 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

265
drivers/scsi/isci/host.c
View File

@ -1018,33 +1018,11 @@ done:
spin_unlock_irqrestore(&ihost->scic_lock, flags);
}
static void isci_tci_free(struct isci_host *ihost, u16 tci)
{
u16 tail = ihost->tci_tail & (SCI_MAX_IO_REQUESTS-1);
ihost->tci_pool[tail] = tci;
ihost->tci_tail = tail + 1;
}
static u16 isci_tci_alloc(struct isci_host *ihost)
{
u16 head = ihost->tci_head & (SCI_MAX_IO_REQUESTS-1);
u16 tci = ihost->tci_pool[head];
ihost->tci_head = head + 1;
return tci;
}
static u16 isci_tci_active(struct isci_host *ihost)
{
return CIRC_CNT(ihost->tci_head, ihost->tci_tail, SCI_MAX_IO_REQUESTS);
}
static u16 isci_tci_space(struct isci_host *ihost)
{
return CIRC_SPACE(ihost->tci_head, ihost->tci_tail, SCI_MAX_IO_REQUESTS);
}
static enum sci_status scic_controller_start(struct scic_sds_controller *scic,
u32 timeout)
{
@ -1205,6 +1183,11 @@ static void isci_host_completion_routine(unsigned long data)
task->task_done(task);
}
}
spin_lock_irq(&isci_host->scic_lock);
isci_free_tag(isci_host, request->sci.io_tag);
spin_unlock_irq(&isci_host->scic_lock);
/* Free the request object. */
isci_request_free(isci_host, request);
}
@ -1242,6 +1225,7 @@ static void isci_host_completion_routine(unsigned long data)
* of pending requests.
*/
list_del_init(&request->dev_node);
isci_free_tag(isci_host, request->sci.io_tag);
spin_unlock_irq(&isci_host->scic_lock);
/* Free the request object. */
@ -2375,6 +2359,7 @@ static int scic_controller_mem_init(struct scic_sds_controller *scic)
if (!scic->task_context_table)
return -ENOMEM;
scic->task_context_dma = dma;
writel(lower_32_bits(dma), &scic->smu_registers->host_task_table_lower);
writel(upper_32_bits(dma), &scic->smu_registers->host_task_table_upper);
@ -2409,11 +2394,9 @@ int isci_host_init(struct isci_host *isci_host)
spin_lock_init(&isci_host->state_lock);
spin_lock_init(&isci_host->scic_lock);
spin_lock_init(&isci_host->queue_lock);
init_waitqueue_head(&isci_host->eventq);
isci_host_change_state(isci_host, isci_starting);
isci_host->can_queue = ISCI_CAN_QUEUE_VAL;
status = scic_controller_construct(&isci_host->sci, scu_base(isci_host),
smu_base(isci_host));
@ -2611,51 +2594,6 @@ void scic_sds_controller_post_request(
writel(request, &scic->smu_registers->post_context_port);
}
/**
* This method will copy the soft copy of the task context into the physical
* memory accessible by the controller.
* @scic: This parameter specifies the controller for which to copy
* the task context.
* @sci_req: This parameter specifies the request for which the task
* context is being copied.
*
* After this call is made the SCIC_SDS_IO_REQUEST object will always point to
* the physical memory version of the task context. Thus, all subsequent
* updates to the task context are performed in the TC table (i.e. DMAable
* memory). none
*/
void scic_sds_controller_copy_task_context(
struct scic_sds_controller *scic,
struct scic_sds_request *sci_req)
{
struct scu_task_context *task_context_buffer;
task_context_buffer = scic_sds_controller_get_task_context_buffer(
scic, sci_req->io_tag);
memcpy(task_context_buffer,
sci_req->task_context_buffer,
offsetof(struct scu_task_context, sgl_snapshot_ac));
/*
* Now that the soft copy of the TC has been copied into the TC
* table accessible by the silicon. Thus, any further changes to
* the TC (e.g. TC termination) occur in the appropriate location. */
sci_req->task_context_buffer = task_context_buffer;
}
struct scu_task_context *scic_sds_controller_get_task_context_buffer(struct scic_sds_controller *scic,
u16 io_tag)
{
u16 tci = ISCI_TAG_TCI(io_tag);
if (tci < scic->task_context_entries) {
return &scic->task_context_table[tci];
}
return NULL;
}
struct scic_sds_request *scic_request_by_tag(struct scic_sds_controller *scic, u16 io_tag)
{
u16 task_index;
@ -2801,6 +2739,60 @@ void scic_sds_controller_release_frame(
&scic->scu_registers->sdma.unsolicited_frame_get_pointer);
}
void isci_tci_free(struct isci_host *ihost, u16 tci)
{
u16 tail = ihost->tci_tail & (SCI_MAX_IO_REQUESTS-1);
ihost->tci_pool[tail] = tci;
ihost->tci_tail = tail + 1;
}
static u16 isci_tci_alloc(struct isci_host *ihost)
{
u16 head = ihost->tci_head & (SCI_MAX_IO_REQUESTS-1);
u16 tci = ihost->tci_pool[head];
ihost->tci_head = head + 1;
return tci;
}
static u16 isci_tci_space(struct isci_host *ihost)
{
return CIRC_SPACE(ihost->tci_head, ihost->tci_tail, SCI_MAX_IO_REQUESTS);
}
u16 isci_alloc_tag(struct isci_host *ihost)
{
if (isci_tci_space(ihost)) {
u16 tci = isci_tci_alloc(ihost);
u8 seq = ihost->sci.io_request_sequence[tci];
return ISCI_TAG(seq, tci);
}
return SCI_CONTROLLER_INVALID_IO_TAG;
}
enum sci_status isci_free_tag(struct isci_host *ihost, u16 io_tag)
{
struct scic_sds_controller *scic = &ihost->sci;
u16 tci = ISCI_TAG_TCI(io_tag);
u16 seq = ISCI_TAG_SEQ(io_tag);
/* prevent tail from passing head */
if (isci_tci_active(ihost) == 0)
return SCI_FAILURE_INVALID_IO_TAG;
if (seq == scic->io_request_sequence[tci]) {
scic->io_request_sequence[tci] = (seq+1) & (SCI_MAX_SEQ-1);
isci_tci_free(ihost, tci);
return SCI_SUCCESS;
}
return SCI_FAILURE_INVALID_IO_TAG;
}
/**
* scic_controller_start_io() - This method is called by the SCI user to
* send/start an IO request. If the method invocation is successful, then
@ -2811,27 +2803,11 @@ void scic_sds_controller_release_frame(
* IO request.
* @io_request: the handle to the io request object to start.
* @io_tag: This parameter specifies a previously allocated IO tag that the
* user desires to be utilized for this request. This parameter is optional.
* The user is allowed to supply SCI_CONTROLLER_INVALID_IO_TAG as the value
* for this parameter.
*
* - IO tags are a protected resource. It is incumbent upon the SCI Core user
* to ensure that each of the methods that may allocate or free available IO
* tags are handled in a mutually exclusive manner. This method is one of said
* methods requiring proper critical code section protection (e.g. semaphore,
* spin-lock, etc.). - For SATA, the user is required to manage NCQ tags. As a
* result, it is expected the user will have set the NCQ tag field in the host
* to device register FIS prior to calling this method. There is also a
* requirement for the user to call scic_stp_io_set_ncq_tag() prior to invoking
* the scic_controller_start_io() method. scic_controller_allocate_tag() for
* more information on allocating a tag. Indicate if the controller
* successfully started the IO request. SCI_SUCCESS if the IO request was
* successfully started. Determine the failure situations and return values.
* user desires to be utilized for this request.
*/
enum sci_status scic_controller_start_io(struct scic_sds_controller *scic,
struct scic_sds_remote_device *rdev,
struct scic_sds_request *req,
u16 io_tag)
struct scic_sds_request *req)
{
enum sci_status status;
@ -2902,17 +2878,6 @@ enum sci_status scic_controller_terminate_request(
* @remote_device: The handle to the remote device object for which to complete
* the IO request.
* @io_request: the handle to the io request object to complete.
*
* - IO tags are a protected resource. It is incumbent upon the SCI Core user
* to ensure that each of the methods that may allocate or free available IO
* tags are handled in a mutually exclusive manner. This method is one of said
* methods requiring proper critical code section protection (e.g. semaphore,
* spin-lock, etc.). - If the IO tag for a request was allocated, by the SCI
* Core user, using the scic_controller_allocate_io_tag() method, then it is
* the responsibility of the caller to invoke the scic_controller_free_io_tag()
* method to free the tag (i.e. this method will not free the IO tag). Indicate
* if the controller successfully completed the IO request. SCI_SUCCESS if the
* completion process was successful.
*/
enum sci_status scic_controller_complete_io(
struct scic_sds_controller *scic,
@ -2963,31 +2928,11 @@ enum sci_status scic_controller_continue_io(struct scic_sds_request *sci_req)
* @remote_device: the handle to the remote device object for which to start
* the task management request.
* @task_request: the handle to the task request object to start.
* @io_tag: This parameter specifies a previously allocated IO tag that the
* user desires to be utilized for this request. Note this not the io_tag
* of the request being managed. It is to be utilized for the task request
* itself. This parameter is optional. The user is allowed to supply
* SCI_CONTROLLER_INVALID_IO_TAG as the value for this parameter.
*
* - IO tags are a protected resource. It is incumbent upon the SCI Core user
* to ensure that each of the methods that may allocate or free available IO
* tags are handled in a mutually exclusive manner. This method is one of said
* methods requiring proper critical code section protection (e.g. semaphore,
* spin-lock, etc.). - The user must synchronize this task with completion
* queue processing. If they are not synchronized then it is possible for the
* io requests that are being managed by the task request can complete before
* starting the task request. scic_controller_allocate_tag() for more
* information on allocating a tag. Indicate if the controller successfully
* started the IO request. SCI_TASK_SUCCESS if the task request was
* successfully started. SCI_TASK_FAILURE_REQUIRES_SCSI_ABORT This value is
* returned if there is/are task(s) outstanding that require termination or
* completion before this request can succeed.
*/
enum sci_task_status scic_controller_start_task(
struct scic_sds_controller *scic,
struct scic_sds_remote_device *rdev,
struct scic_sds_request *req,
u16 task_tag)
struct scic_sds_request *req)
{
enum sci_status status;
@ -3022,85 +2967,3 @@ enum sci_task_status scic_controller_start_task(
return status;
}
/**
* scic_controller_allocate_io_tag() - This method will allocate a tag from the
* pool of free IO tags. Direct allocation of IO tags by the SCI Core user
* is optional. The scic_controller_start_io() method will allocate an IO
* tag if this method is not utilized and the tag is not supplied to the IO
* construct routine. Direct allocation of IO tags may provide additional
* performance improvements in environments capable of supporting this usage
* model. Additionally, direct allocation of IO tags also provides
* additional flexibility to the SCI Core user. Specifically, the user may
* retain IO tags across the lives of multiple IO requests.
* @controller: the handle to the controller object for which to allocate the
* tag.
*
* IO tags are a protected resource. It is incumbent upon the SCI Core user to
* ensure that each of the methods that may allocate or free available IO tags
* are handled in a mutually exclusive manner. This method is one of said
* methods requiring proper critical code section protection (e.g. semaphore,
* spin-lock, etc.). An unsigned integer representing an available IO tag.
* SCI_CONTROLLER_INVALID_IO_TAG This value is returned if there are no
* currently available tags to be allocated. All return other values indicate a
* legitimate tag.
*/
u16 scic_controller_allocate_io_tag(struct scic_sds_controller *scic)
{
struct isci_host *ihost = scic_to_ihost(scic);
if (isci_tci_space(ihost)) {
u16 tci = isci_tci_alloc(ihost);
u8 seq = scic->io_request_sequence[tci];
return ISCI_TAG(seq, tci);
}
return SCI_CONTROLLER_INVALID_IO_TAG;
}
/**
* scic_controller_free_io_tag() - This method will free an IO tag to the pool
* of free IO tags. This method provides the SCI Core user more flexibility
* with regards to IO tags. The user may desire to keep an IO tag after an
* IO request has completed, because they plan on re-using the tag for a
* subsequent IO request. This method is only legal if the tag was
* allocated via scic_controller_allocate_io_tag().
* @controller: This parameter specifies the handle to the controller object
* for which to free/return the tag.
* @io_tag: This parameter represents the tag to be freed to the pool of
* available tags.
*
* - IO tags are a protected resource. It is incumbent upon the SCI Core user
* to ensure that each of the methods that may allocate or free available IO
* tags are handled in a mutually exclusive manner. This method is one of said
* methods requiring proper critical code section protection (e.g. semaphore,
* spin-lock, etc.). - If the IO tag for a request was allocated, by the SCI
* Core user, using the scic_controller_allocate_io_tag() method, then it is
* the responsibility of the caller to invoke this method to free the tag. This
* method returns an indication of whether the tag was successfully put back
* (freed) to the pool of available tags. SCI_SUCCESS This return value
* indicates the tag was successfully placed into the pool of available IO
* tags. SCI_FAILURE_INVALID_IO_TAG This value is returned if the supplied tag
* is not a valid IO tag value.
*/
enum sci_status scic_controller_free_io_tag(struct scic_sds_controller *scic,
u16 io_tag)
{
struct isci_host *ihost = scic_to_ihost(scic);
u16 tci = ISCI_TAG_TCI(io_tag);
u16 seq = ISCI_TAG_SEQ(io_tag);
/* prevent tail from passing head */
if (isci_tci_active(ihost) == 0)
return SCI_FAILURE_INVALID_IO_TAG;
if (seq == scic->io_request_sequence[tci]) {
scic->io_request_sequence[tci] = (seq+1) & (SCI_MAX_SEQ-1);
isci_tci_free(ihost, ISCI_TAG_TCI(io_tag));
return SCI_SUCCESS;
}
return SCI_FAILURE_INVALID_IO_TAG;
}

55
drivers/scsi/isci/host.h
View File

@ -192,6 +192,7 @@ struct scic_sds_controller {
* context table. This data is shared between the hardware and software.
*/
struct scu_task_context *task_context_table;
dma_addr_t task_context_dma;
/**
* This field is a pointer to the memory allocated by the driver for the
@ -302,12 +303,8 @@ struct isci_host {
struct isci_port ports[SCI_MAX_PORTS + 1]; /* includes dummy port */
struct sas_ha_struct sas_ha;
int can_queue;
spinlock_t queue_lock;
spinlock_t state_lock;
struct pci_dev *pdev;
enum isci_status status;
#define IHOST_START_PENDING 0
#define IHOST_STOP_PENDING 1
@ -451,36 +448,6 @@ static inline void isci_host_change_state(struct isci_host *isci_host,
}
static inline int isci_host_can_queue(struct isci_host *isci_host, int num)
{
int ret = 0;
unsigned long flags;
spin_lock_irqsave(&isci_host->queue_lock, flags);
if ((isci_host->can_queue - num) < 0) {
dev_dbg(&isci_host->pdev->dev,
"%s: isci_host->can_queue = %d\n",
__func__,
isci_host->can_queue);
ret = -SAS_QUEUE_FULL;
} else
isci_host->can_queue -= num;
spin_unlock_irqrestore(&isci_host->queue_lock, flags);
return ret;
}
static inline void isci_host_can_dequeue(struct isci_host *isci_host, int num)
{
unsigned long flags;
spin_lock_irqsave(&isci_host->queue_lock, flags);
isci_host->can_queue += num;
spin_unlock_irqrestore(&isci_host->queue_lock, flags);
}
static inline void wait_for_start(struct isci_host *ihost)
{
wait_event(ihost->eventq, !test_bit(IHOST_START_PENDING, &ihost->flags));
@ -646,10 +613,6 @@ union scu_remote_node_context *scic_sds_controller_get_remote_node_context_buffe
struct scic_sds_request *scic_request_by_tag(struct scic_sds_controller *scic,
u16 io_tag);
struct scu_task_context *scic_sds_controller_get_task_context_buffer(
struct scic_sds_controller *scic,
u16 io_tag);
void scic_sds_controller_power_control_queue_insert(
struct scic_sds_controller *scic,
struct scic_sds_phy *sci_phy);
@ -681,6 +644,9 @@ void scic_sds_controller_register_setup(struct scic_sds_controller *scic);
enum sci_status scic_controller_continue_io(struct scic_sds_request *sci_req);
int isci_host_scan_finished(struct Scsi_Host *, unsigned long);
void isci_host_scan_start(struct Scsi_Host *);
u16 isci_alloc_tag(struct isci_host *ihost);
enum sci_status isci_free_tag(struct isci_host *ihost, u16 io_tag);
void isci_tci_free(struct isci_host *ihost, u16 tci);
int isci_host_init(struct isci_host *);
@ -708,14 +674,12 @@ void scic_controller_disable_interrupts(
enum sci_status scic_controller_start_io(
struct scic_sds_controller *scic,
struct scic_sds_remote_device *remote_device,
struct scic_sds_request *io_request,
u16 io_tag);
struct scic_sds_request *io_request);
enum sci_task_status scic_controller_start_task(
struct scic_sds_controller *scic,
struct scic_sds_remote_device *remote_device,
struct scic_sds_request *task_request,
u16 io_tag);
struct scic_sds_request *task_request);
enum sci_status scic_controller_terminate_request(
struct scic_sds_controller *scic,
@ -727,13 +691,6 @@ enum sci_status scic_controller_complete_io(
struct scic_sds_remote_device *remote_device,
struct scic_sds_request *io_request);
u16 scic_controller_allocate_io_tag(
struct scic_sds_controller *scic);
enum sci_status scic_controller_free_io_tag(
struct scic_sds_controller *scic,
u16 io_tag);
void scic_sds_port_configuration_agent_construct(
struct scic_sds_port_configuration_agent *port_agent);

61
drivers/scsi/isci/port.c
View File

@ -695,35 +695,21 @@ static void scic_sds_port_construct_dummy_rnc(struct scic_sds_port *sci_port, u1
*/
static void scic_sds_port_construct_dummy_task(struct scic_sds_port *sci_port, u16 tag)
{
struct scic_sds_controller *scic = sci_port->owning_controller;
struct scu_task_context *task_context;
task_context = scic_sds_controller_get_task_context_buffer(sci_port->owning_controller, tag);
task_context = &scic->task_context_table[ISCI_TAG_TCI(tag)];
memset(task_context, 0, sizeof(struct scu_task_context));
task_context->abort = 0;
task_context->priority = 0;
task_context->initiator_request = 1;
task_context->connection_rate = 1;
task_context->protocol_engine_index = 0;
task_context->logical_port_index = sci_port->physical_port_index;
task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_SSP;
task_context->task_index = ISCI_TAG_TCI(tag);
task_context->valid = SCU_TASK_CONTEXT_VALID;
task_context->context_type = SCU_TASK_CONTEXT_TYPE;
task_context->remote_node_index = sci_port->reserved_rni;
task_context->command_code = 0;
task_context->link_layer_control = 0;
task_context->do_not_dma_ssp_good_response = 1;
task_context->strict_ordering = 0;
task_context->control_frame = 0;
task_context->timeout_enable = 0;
task_context->block_guard_enable = 0;
task_context->address_modifier = 0;
task_context->task_phase = 0x01;
}
@ -731,15 +717,15 @@ static void scic_sds_port_destroy_dummy_resources(struct scic_sds_port *sci_port
{
struct scic_sds_controller *scic = sci_port->owning_controller;
if (sci_port->reserved_tci != SCU_DUMMY_INDEX)
scic_controller_free_io_tag(scic, sci_port->reserved_tci);
if (sci_port->reserved_tag != SCI_CONTROLLER_INVALID_IO_TAG)
isci_free_tag(scic_to_ihost(scic), sci_port->reserved_tag);
if (sci_port->reserved_rni != SCU_DUMMY_INDEX)
scic_sds_remote_node_table_release_remote_node_index(&scic->available_remote_nodes,
1, sci_port->reserved_rni);
sci_port->reserved_rni = SCU_DUMMY_INDEX;
sci_port->reserved_tci = SCU_DUMMY_INDEX;
sci_port->reserved_tag = SCI_CONTROLLER_INVALID_IO_TAG;
}
/**
@ -1119,18 +1105,17 @@ scic_sds_port_suspend_port_task_scheduler(struct scic_sds_port *port)
*/
static void scic_sds_port_post_dummy_request(struct scic_sds_port *sci_port)
{
u32 command;
struct scu_task_context *task_context;
struct scic_sds_controller *scic = sci_port->owning_controller;
u16 tci = sci_port->reserved_tci;
u16 tag = sci_port->reserved_tag;
struct scu_task_context *tc;
u32 command;
task_context = scic_sds_controller_get_task_context_buffer(scic, tci);
task_context->abort = 0;
tc = &scic->task_context_table[ISCI_TAG_TCI(tag)];
tc->abort = 0;
command = SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
sci_port->physical_port_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT |
tci;
ISCI_TAG_TCI(tag);
scic_sds_controller_post_request(scic, command);
}
@ -1145,17 +1130,16 @@ static void scic_sds_port_post_dummy_request(struct scic_sds_port *sci_port)
static void scic_sds_port_abort_dummy_request(struct scic_sds_port *sci_port)
{
struct scic_sds_controller *scic = sci_port->owning_controller;
u16 tci = sci_port->reserved_tci;
u16 tag = sci_port->reserved_tag;
struct scu_task_context *tc;
u32 command;
tc = scic_sds_controller_get_task_context_buffer(scic, tci);
tc = &scic->task_context_table[ISCI_TAG_TCI(tag)];
tc->abort = 1;
command = SCU_CONTEXT_COMMAND_REQUEST_POST_TC_ABORT |
sci_port->physical_port_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT |
tci;
ISCI_TAG_TCI(tag);
scic_sds_controller_post_request(scic, command);
}
@ -1333,15 +1317,16 @@ enum sci_status scic_sds_port_start(struct scic_sds_port *sci_port)
sci_port->reserved_rni = rni;
}
if (sci_port->reserved_tci == SCU_DUMMY_INDEX) {
/* Allocate a TCI and remove the sequence nibble */
u16 tci = scic_controller_allocate_io_tag(scic);
if (sci_port->reserved_tag == SCI_CONTROLLER_INVALID_IO_TAG) {
struct isci_host *ihost = scic_to_ihost(scic);
u16 tag;
if (tci != SCU_DUMMY_INDEX)
scic_sds_port_construct_dummy_task(sci_port, tci);
else
tag = isci_alloc_tag(ihost);
if (tag == SCI_CONTROLLER_INVALID_IO_TAG)
status = SCI_FAILURE_INSUFFICIENT_RESOURCES;
sci_port->reserved_tci = tci;
else
scic_sds_port_construct_dummy_task(sci_port, tag);
sci_port->reserved_tag = tag;
}
if (status == SCI_SUCCESS) {
@ -1859,7 +1844,7 @@ void scic_sds_port_construct(struct scic_sds_port *sci_port, u8 index,
sci_port->assigned_device_count = 0;
sci_port->reserved_rni = SCU_DUMMY_INDEX;
sci_port->reserved_tci = SCU_DUMMY_INDEX;
sci_port->reserved_tag = SCI_CONTROLLER_INVALID_IO_TAG;
sci_init_timer(&sci_port->timer, port_timeout);

2
drivers/scsi/isci/port.h
View File

@ -108,7 +108,7 @@ struct scic_sds_port {
u8 active_phy_mask;
u16 reserved_rni;
u16 reserved_tci;
u16 reserved_tag;
/**
* This field contains the count of the io requests started on this port

479
drivers/scsi/isci/request.c
View File

@ -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;
task_context = (struct scu_task_context *)sci_req->task_context_buffer;
if (sgl_pair_index == 0) {
return &task_context->sgl_pair_ab;
} else if (sgl_pair_index == 1) {
return &task_context->sgl_pair_cd;
}
return &sci_req->sg_table[sgl_pair_index - 2];
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];
}
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 (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 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);
tc->task_index = ISCI_TAG_TCI(sci_req->io_tag);
/* Record the IO Tag in the request */
if (sci_req->io_tag != SCI_CONTROLLER_INVALID_IO_TAG) {
task_context = sci_req->task_context_buffer;
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;
task_context->task_index = ISCI_TAG_TCI(sci_req->io_tag);
case SCU_TASK_CONTEXT_PROTOCOL_STP:
/* STP/SATA Frame
* tc->type.stp.ncq_tag = sci_req->ncq_tag;
*/
break;
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;
case SCU_TASK_CONTEXT_PROTOCOL_NONE:
/* / @todo When do we set no protocol type? */
break;
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;
default:
/* This should never happen since we build the IO
* requests */
break;
}
/*
* Check to see if we need to copy the task context buffer
* or have been building into the task context buffer */
if (sci_req->was_tag_assigned_by_user == false)
scic_sds_controller_copy_task_context(scic, sci_req);
/* Add to the post_context the io tag value */
sci_req->post_context |= ISCI_TAG_TCI(sci_req->io_tag);
/* Everything is good go ahead and change state */
sci_change_state(&sci_req->sm, SCI_REQ_STARTED);
return SCI_SUCCESS;
default:
/* This should never happen since we build the IO
* requests */
break;
}
return SCI_FAILURE_INSUFFICIENT_RESOURCES;
/* Add to the post_context the io tag value */
sci_req->post_context |= ISCI_TAG_TCI(sci_req->io_tag);
/* Everything is good go ahead and change state */
sci_change_state(&sci_req->sm, SCI_REQ_STARTED);
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;
}

58
drivers/scsi/isci/request.h
View File

@ -136,7 +136,7 @@ struct scic_sds_stp_request {
u8 ending_error;
struct scic_sds_request_pio_sgl {
struct scu_sgl_element_pair *sgl_pair;
int sgl_index;
u8 sgl_set;
u32 sgl_offset;
} request_current;
@ -171,12 +171,6 @@ struct scic_sds_request {
*/
struct scic_sds_remote_device *target_device;
/*
* This field is utilized to determine if the SCI user is managing
* the IO tag for this request or if the core is managing it.
*/
bool was_tag_assigned_by_user;
/*
* This field indicates the IO tag for this request. The IO tag is
* comprised of the task_index and a sequence count. The sequence count
@ -209,8 +203,7 @@ struct scic_sds_request {
*/
u32 post_context;
struct scu_task_context *task_context_buffer;
struct scu_task_context tc ____cacheline_aligned;
struct scu_task_context *tc;
/* could be larger with sg chaining */
#define SCU_SGL_SIZE ((SCI_MAX_SCATTER_GATHER_ELEMENTS + 1) / 2)
@ -465,35 +458,6 @@ enum sci_base_request_states {
(request)->sci_status = (sci_status_code); \
}
/**
* SCU_SGL_ZERO() -
*
* This macro zeros the hardware SGL element data
*/
#define SCU_SGL_ZERO(scu_sge) \
{ \
(scu_sge).length = 0; \
(scu_sge).address_lower = 0; \
(scu_sge).address_upper = 0; \
(scu_sge).address_modifier = 0; \
}
/**
* SCU_SGL_COPY() -
*
* This macro copys the SGL Element data from the host os to the hardware SGL
* elment data
*/
#define SCU_SGL_COPY(scu_sge, os_sge) \
{ \
(scu_sge).length = sg_dma_len(sg); \
(scu_sge).address_upper = \
upper_32_bits(sg_dma_address(sg)); \
(scu_sge).address_lower = \
lower_32_bits(sg_dma_address(sg)); \
(scu_sge).address_modifier = 0; \
}
enum sci_status scic_sds_request_start(struct scic_sds_request *sci_req);
enum sci_status scic_sds_io_request_terminate(struct scic_sds_request *sci_req);
enum sci_status
@ -509,22 +473,6 @@ scic_sds_request_complete(struct scic_sds_request *sci_req);
extern enum sci_status
scic_sds_io_request_tc_completion(struct scic_sds_request *sci_req, u32 code);
/* XXX open code in caller */
static inline void *scic_request_get_virt_addr(struct scic_sds_request *sci_req,
dma_addr_t phys_addr)
{
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 >= sizeof(*ireq));
return (char *)ireq + offset;
}
/* XXX open code in caller */
static inline dma_addr_t
scic_io_request_get_dma_addr(struct scic_sds_request *sci_req, void *virt_addr)
@ -672,7 +620,7 @@ struct isci_request *isci_request_alloc_tmf(struct isci_host *ihost,
struct isci_tmf *isci_tmf,
gfp_t gfp_flags);
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);
void isci_terminate_pending_requests(struct isci_host *ihost,
struct isci_remote_device *idev);
enum sci_status

80
drivers/scsi/isci/task.c
View File

@ -63,6 +63,7 @@
#include "request.h"
#include "sata.h"
#include "task.h"
#include "host.h"
/**
* isci_task_refuse() - complete the request to the upper layer driver in
@ -156,25 +157,19 @@ int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
{
struct isci_host *ihost = dev_to_ihost(task->dev);
struct isci_remote_device *idev;
enum sci_status status;
unsigned long flags;
bool io_ready;
int ret;
u16 tag;
dev_dbg(&ihost->pdev->dev, "%s: num=%d\n", __func__, num);
/* Check if we have room for more tasks */
ret = isci_host_can_queue(ihost, num);
if (ret) {
dev_warn(&ihost->pdev->dev, "%s: queue full\n", __func__);
return ret;
}
for_each_sas_task(num, task) {
enum sci_status status = SCI_FAILURE;
spin_lock_irqsave(&ihost->scic_lock, flags);
idev = isci_lookup_device(task->dev);
io_ready = isci_device_io_ready(idev, task);
tag = isci_alloc_tag(ihost);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
dev_dbg(&ihost->pdev->dev,
@ -185,15 +180,12 @@ int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
if (!idev) {
isci_task_refuse(ihost, task, SAS_TASK_UNDELIVERED,
SAS_DEVICE_UNKNOWN);
isci_host_can_dequeue(ihost, 1);
} else if (!io_ready) {
} else if (!io_ready || tag == SCI_CONTROLLER_INVALID_IO_TAG) {
/* Indicate QUEUE_FULL so that the scsi midlayer
* retries.
*/
isci_task_refuse(ihost, task, SAS_TASK_COMPLETE,
SAS_QUEUE_FULL);
isci_host_can_dequeue(ihost, 1);
} else {
/* There is a device and it's ready for I/O. */
spin_lock_irqsave(&task->task_state_lock, flags);
@ -206,13 +198,12 @@ int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
isci_task_refuse(ihost, task,
SAS_TASK_UNDELIVERED,
SAM_STAT_TASK_ABORTED);
isci_host_can_dequeue(ihost, 1);
} else {
task->task_state_flags |= SAS_TASK_AT_INITIATOR;
spin_unlock_irqrestore(&task->task_state_lock, flags);
/* build and send the request. */
status = isci_request_execute(ihost, idev, task, gfp_flags);
status = isci_request_execute(ihost, idev, task, tag, gfp_flags);
if (status != SCI_SUCCESS) {
@ -231,10 +222,17 @@ int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
isci_task_refuse(ihost, task,
SAS_TASK_COMPLETE,
SAS_QUEUE_FULL);
isci_host_can_dequeue(ihost, 1);
}
}
}
if (status != SCI_SUCCESS && tag != SCI_CONTROLLER_INVALID_IO_TAG) {
spin_lock_irqsave(&ihost->scic_lock, flags);
/* command never hit the device, so just free
* the tci and skip the sequence increment
*/
isci_tci_free(ihost, ISCI_TAG_TCI(tag));
spin_unlock_irqrestore(&ihost->scic_lock, flags);
}
isci_put_device(idev);
}
return 0;
@ -242,7 +240,7 @@ int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
static struct isci_request *isci_task_request_build(struct isci_host *ihost,
struct isci_remote_device *idev,
struct isci_tmf *isci_tmf)
u16 tag, struct isci_tmf *isci_tmf)
{
enum sci_status status = SCI_FAILURE;
struct isci_request *ireq = NULL;
@ -259,8 +257,7 @@ static struct isci_request *isci_task_request_build(struct isci_host *ihost,
return NULL;
/* let the core do it's construct. */
status = scic_task_request_construct(&ihost->sci, &idev->sci,
SCI_CONTROLLER_INVALID_IO_TAG,
status = scic_task_request_construct(&ihost->sci, &idev->sci, tag,
&ireq->sci);
if (status != SCI_SUCCESS) {
@ -290,8 +287,7 @@ static struct isci_request *isci_task_request_build(struct isci_host *ihost,
return ireq;
errout:
isci_request_free(ihost, ireq);
ireq = NULL;
return ireq;
return NULL;
}
int isci_task_execute_tmf(struct isci_host *ihost,
@ -305,6 +301,14 @@ int isci_task_execute_tmf(struct isci_host *ihost,
int ret = TMF_RESP_FUNC_FAILED;
unsigned long flags;
unsigned long timeleft;
u16 tag;
spin_lock_irqsave(&ihost->scic_lock, flags);
tag = isci_alloc_tag(ihost);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
if (tag == SCI_CONTROLLER_INVALID_IO_TAG)
return ret;
/* sanity check, return TMF_RESP_FUNC_FAILED
* if the device is not there and ready.
@ -316,7 +320,7 @@ int isci_task_execute_tmf(struct isci_host *ihost,
"%s: isci_device = %p not ready (%#lx)\n",
__func__,
isci_device, isci_device ? isci_device->flags : 0);
return TMF_RESP_FUNC_FAILED;
goto err_tci;
} else
dev_dbg(&ihost->pdev->dev,
"%s: isci_device = %p\n",
@ -327,22 +331,16 @@ int isci_task_execute_tmf(struct isci_host *ihost,
/* Assign the pointer to the TMF's completion kernel wait structure. */
tmf->complete = &completion;
ireq = isci_task_request_build(ihost, isci_device, tmf);
if (!ireq) {
dev_warn(&ihost->pdev->dev,
"%s: isci_task_request_build failed\n",
__func__);
return TMF_RESP_FUNC_FAILED;
}
ireq = isci_task_request_build(ihost, isci_device, tag, tmf);
if (!ireq)
goto err_tci;
spin_lock_irqsave(&ihost->scic_lock, flags);
/* start the TMF io. */
status = scic_controller_start_task(
&ihost->sci,
sci_device,
&ireq->sci,
SCI_CONTROLLER_INVALID_IO_TAG);
status = scic_controller_start_task(&ihost->sci,
sci_device,
&ireq->sci);
if (status != SCI_TASK_SUCCESS) {
dev_warn(&ihost->pdev->dev,
@ -351,8 +349,7 @@ int isci_task_execute_tmf(struct isci_host *ihost,
status,
ireq);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
isci_request_free(ihost, ireq);
return ret;
goto err_ireq;
}
if (tmf->cb_state_func != NULL)
@ -403,6 +400,15 @@ int isci_task_execute_tmf(struct isci_host *ihost,
ireq);
return ret;
err_ireq:
isci_request_free(ihost, ireq);
err_tci:
spin_lock_irqsave(&ihost->scic_lock, flags);
isci_tci_free(ihost, ISCI_TAG_TCI(tag));
spin_unlock_irqrestore(&ihost->scic_lock, flags);
return ret;
}
void isci_task_build_tmf(