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isci: cleanup tag macros
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A tag is a 16 bit number where the upper four bits is a sequence number
and the remainder is the task context index (tci).  Sanitize the macro
names and shave 256-bytes out of scic_sds_controller by reducing the size of
io_request_sequence.

scic_sds_io_tag_construct --> ISCI_TAG
scic_sds_io_tag_get_sequence --> ISCI_TAG_SEQ
scic_sds_io_tag_get_index() --> ISCI_TAG_TCI
scic_sds_io_sequence_increment() [delete / open code]

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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Dan Williams committed Jul 3, 2011
1 parent ac668c6 commit dd047c8
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Showing 5 changed files with 52 additions and 114 deletions.
88 changes: 32 additions & 56 deletions drivers/scsi/isci/host.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -284,23 +284,16 @@ static void scic_sds_controller_task_completion(struct scic_sds_controller *scic
u32 completion_entry)
{
u32 index;
struct scic_sds_request *io_request;
struct scic_sds_request *sci_req;

index = SCU_GET_COMPLETION_INDEX(completion_entry);
io_request = scic->io_request_table[index];
sci_req = scic->io_request_table[index];

/* Make sure that we really want to process this IO request */
if (
(io_request != NULL)
&& (io_request->io_tag != SCI_CONTROLLER_INVALID_IO_TAG)
&& (
scic_sds_io_tag_get_sequence(io_request->io_tag)
== scic->io_request_sequence[index]
)
) {
if (sci_req && sci_req->io_tag != SCI_CONTROLLER_INVALID_IO_TAG &&
ISCI_TAG_SEQ(sci_req->io_tag) == scic->io_request_sequence[index])
/* Yep this is a valid io request pass it along to the io request handler */
scic_sds_io_request_tc_completion(io_request, completion_entry);
}
scic_sds_io_request_tc_completion(sci_req, completion_entry);
}

static void scic_sds_controller_sdma_completion(struct scic_sds_controller *scic,
Expand Down Expand Up @@ -2682,37 +2675,28 @@ void scic_sds_controller_copy_task_context(
sci_req->task_context_buffer = task_context_buffer;
}

/**
* This method returns the task context buffer for the given io tag.
* @scic:
* @io_tag:
*
* struct scu_task_context*
*/
struct scu_task_context *scic_sds_controller_get_task_context_buffer(
struct scic_sds_controller *scic,
u16 io_tag
) {
u16 task_index = scic_sds_io_tag_get_index(io_tag);
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 (task_index < scic->task_context_entries) {
return &scic->task_context_table[task_index];
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)
struct scic_sds_request *scic_request_by_tag(struct scic_sds_controller *scic, u16 io_tag)
{
u16 task_index;
u16 task_sequence;

task_index = scic_sds_io_tag_get_index(io_tag);
task_index = ISCI_TAG_TCI(io_tag);

if (task_index < scic->task_context_entries) {
if (task_index < scic->task_context_entries) {
if (scic->io_request_table[task_index] != NULL) {
task_sequence = scic_sds_io_tag_get_sequence(io_tag);
task_sequence = ISCI_TAG_SEQ(io_tag);

if (task_sequence == scic->io_request_sequence[task_index]) {
return scic->io_request_table[task_index];
Expand Down Expand Up @@ -2875,11 +2859,10 @@ void scic_sds_controller_release_frame(
* successfully started the IO request. SCI_SUCCESS if the IO request was
* successfully started. Determine the failure situations and return values.
*/
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)
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)
{
enum sci_status status;

Expand All @@ -2892,7 +2875,7 @@ enum sci_status scic_controller_start_io(
if (status != SCI_SUCCESS)
return status;

scic->io_request_table[scic_sds_io_tag_get_index(req->io_tag)] = req;
scic->io_request_table[ISCI_TAG_TCI(req->io_tag)] = req;
scic_sds_controller_post_request(scic, scic_sds_request_get_post_context(req));
return SCI_SUCCESS;
}
Expand Down Expand Up @@ -2979,7 +2962,7 @@ enum sci_status scic_controller_complete_io(
if (status != SCI_SUCCESS)
return status;

index = scic_sds_io_tag_get_index(request->io_tag);
index = ISCI_TAG_TCI(request->io_tag);
scic->io_request_table[index] = NULL;
return SCI_SUCCESS;
default:
Expand All @@ -2998,7 +2981,7 @@ enum sci_status scic_controller_continue_io(struct scic_sds_request *sci_req)
return SCI_FAILURE_INVALID_STATE;
}

scic->io_request_table[scic_sds_io_tag_get_index(sci_req->io_tag)] = sci_req;
scic->io_request_table[ISCI_TAG_TCI(sci_req->io_tag)] = sci_req;
scic_sds_controller_post_request(scic, scic_sds_request_get_post_context(sci_req));
return SCI_SUCCESS;
}
Expand Down Expand Up @@ -3050,7 +3033,7 @@ enum sci_task_status scic_controller_start_task(
status = scic_sds_remote_device_start_task(scic, rdev, req);
switch (status) {
case SCI_FAILURE_RESET_DEVICE_PARTIAL_SUCCESS:
scic->io_request_table[scic_sds_io_tag_get_index(req->io_tag)] = req;
scic->io_request_table[ISCI_TAG_TCI(req->io_tag)] = req;

/*
* We will let framework know this task request started successfully,
Expand All @@ -3059,7 +3042,7 @@ enum sci_task_status scic_controller_start_task(
*/
return SCI_SUCCESS;
case SCI_SUCCESS:
scic->io_request_table[scic_sds_io_tag_get_index(req->io_tag)] = req;
scic->io_request_table[ISCI_TAG_TCI(req->io_tag)] = req;

scic_sds_controller_post_request(scic,
scic_sds_request_get_post_context(req));
Expand Down Expand Up @@ -3096,14 +3079,12 @@ enum sci_task_status scic_controller_start_task(
u16 scic_controller_allocate_io_tag(struct scic_sds_controller *scic)
{
struct isci_host *ihost = scic_to_ihost(scic);
u16 tci;
u16 seq;

if (isci_tci_space(ihost)) {
tci = isci_tci_alloc(ihost);
seq = scic->io_request_sequence[tci];
u16 tci = isci_tci_alloc(ihost);
u8 seq = scic->io_request_sequence[tci];

return scic_sds_io_tag_construct(seq, tci);
return ISCI_TAG(seq, tci);
}

return SCI_CONTROLLER_INVALID_IO_TAG;
Expand Down Expand Up @@ -3138,22 +3119,17 @@ 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 sequence;
u16 index;

BUG_ON(io_tag == SCI_CONTROLLER_INVALID_IO_TAG);

sequence = scic_sds_io_tag_get_sequence(io_tag);
index = scic_sds_io_tag_get_index(io_tag);
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 (sequence == scic->io_request_sequence[index]) {
scic_sds_io_sequence_increment(scic->io_request_sequence[index]);
if (seq == scic->io_request_sequence[tci]) {
scic->io_request_sequence[tci] = (seq+1) & (SCI_MAX_SEQ-1);

isci_tci_free(ihost, index);
isci_tci_free(ihost, ISCI_TAG_TCI(io_tag));

return SCI_SUCCESS;
}
Expand Down
47 changes: 7 additions & 40 deletions drivers/scsi/isci/host.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -184,13 +184,8 @@ struct scic_sds_controller {
*/
struct scic_power_control power_control;

/**
* This field is the array of sequence values for the IO Tag fields. Even
* though only 4 bits of the field is used for the sequence the sequence is 16
* bits in size so the sequence can be bitwise or'd with the TCi to build the
* IO Tag value.
*/
u16 io_request_sequence[SCI_MAX_IO_REQUESTS];
/* sequence number per tci */
u8 io_request_sequence[SCI_MAX_IO_REQUESTS];

/**
* This field in the array of sequence values for the RNi. These are used
Expand Down Expand Up @@ -552,40 +547,12 @@ static inline struct isci_host *scic_to_ihost(struct scic_sds_controller *scic)
*/
#define scic_sds_controller_get_protocol_engine_group(controller) 0

/**
* scic_sds_io_tag_construct() -
*
* This macro constructs an IO tag from the sequence and index values.
*/
#define scic_sds_io_tag_construct(sequence, task_index) \
((sequence) << 12 | (task_index))

/**
* scic_sds_io_tag_get_sequence() -
*
* This macro returns the IO sequence from the IO tag value.
*/
#define scic_sds_io_tag_get_sequence(io_tag) \
(((io_tag) & 0xF000) >> 12)

/**
* scic_sds_io_tag_get_index() -
*
* This macro returns the TCi from the io tag value
*/
#define scic_sds_io_tag_get_index(io_tag) \
((io_tag) & 0x0FFF)
/* see scic_controller_io_tag_allocate|free for how seq and tci are built */
#define ISCI_TAG(seq, tci) (((u16) (seq)) << 12 | tci)

/**
* scic_sds_io_sequence_increment() -
*
* This is a helper macro to increment the io sequence count. We may find in
* the future that it will be faster to store the sequence count in such a way
* as we dont perform the shift operation to build io tag values so therefore
* need a way to incrment them correctly
*/
#define scic_sds_io_sequence_increment(value) \
((value) = (((value) + 1) & 0x000F))
/* these are returned by the hardware, so sanitize them */
#define ISCI_TAG_SEQ(tag) (((tag) >> 12) & (SCI_MAX_SEQ-1))
#define ISCI_TAG_TCI(tag) ((tag) & (SCI_MAX_IO_REQUESTS-1))

/* expander attached sata devices require 3 rnc slots */
static inline int scic_sds_remote_device_node_count(struct scic_sds_remote_device *sci_dev)
Expand Down
2 changes: 2 additions & 0 deletions drivers/scsi/isci/isci.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -83,6 +83,7 @@ enum sci_controller_mode {
#define SCI_MAX_SMP_PHYS (384) /* not silicon constrained */
#define SCI_MAX_REMOTE_DEVICES (256UL)
#define SCI_MAX_IO_REQUESTS (256UL)
#define SCI_MAX_SEQ (16)
#define SCI_MAX_MSIX_MESSAGES (2)
#define SCI_MAX_SCATTER_GATHER_ELEMENTS 130 /* not silicon constrained */
#define SCI_MAX_CONTROLLERS 2
Expand Down Expand Up @@ -113,6 +114,7 @@ static inline void check_sizes(void)
BUILD_BUG_ON_NOT_POWER_OF_2(SCU_MAX_COMPLETION_QUEUE_ENTRIES);
BUILD_BUG_ON(SCU_MAX_UNSOLICITED_FRAMES > SCU_ABSOLUTE_MAX_UNSOLICITED_FRAMES);
BUILD_BUG_ON_NOT_POWER_OF_2(SCI_MAX_IO_REQUESTS);
BUILD_BUG_ON_NOT_POWER_OF_2(SCI_MAX_SEQ);
}

/**
Expand Down
17 changes: 5 additions & 12 deletions drivers/scsi/isci/port.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -689,23 +689,16 @@ static void scic_sds_port_construct_dummy_rnc(struct scic_sds_port *sci_port, u1
rnc->ssp.arbitration_wait_time = 0;
}

/**
* scic_sds_port_construct_dummy_task() - create dummy task for si workaround
* @sci_port The logical port on which we need to create the
* remote node context.
* context.
* @tci The remote node index for this remote node context.
*
* This routine will construct a dummy task context data structure. This
/*
* construct a dummy task context data structure. This
* structure will be posted to the hardwre to work around a scheduler error
* in the hardware.
*
*/
static void scic_sds_port_construct_dummy_task(struct scic_sds_port *sci_port, u16 tci)
static void scic_sds_port_construct_dummy_task(struct scic_sds_port *sci_port, u16 tag)
{
struct scu_task_context *task_context;

task_context = scic_sds_controller_get_task_context_buffer(sci_port->owning_controller, tci);
task_context = scic_sds_controller_get_task_context_buffer(sci_port->owning_controller, tag);

memset(task_context, 0, sizeof(struct scu_task_context));

Expand All @@ -716,7 +709,7 @@ static void scic_sds_port_construct_dummy_task(struct scic_sds_port *sci_port, u
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 = scic_sds_io_tag_get_index(tci);
task_context->task_index = ISCI_TAG_TCI(tag);
task_context->valid = SCU_TASK_CONTEXT_VALID;
task_context->context_type = SCU_TASK_CONTEXT_TYPE;

Expand Down
12 changes: 6 additions & 6 deletions drivers/scsi/isci/request.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -258,7 +258,7 @@ static void scu_ssp_reqeust_construct_task_context(
SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
(scic_sds_port_get_index(target_port) <<
SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
scic_sds_io_tag_get_index(sds_request->io_tag));
ISCI_TAG_TCI(sds_request->io_tag));
} else {
/*
* Build the task context now since we have already read
Expand Down Expand Up @@ -433,7 +433,7 @@ static void scu_sata_reqeust_construct_task_context(
SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
(scic_sds_port_get_index(target_port) <<
SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
scic_sds_io_tag_get_index(sci_req->io_tag));
ISCI_TAG_TCI(sci_req->io_tag));
} else {
/*
* Build the task context now since we have already read
Expand Down Expand Up @@ -741,7 +741,7 @@ static u32 sci_req_tx_bytes(struct scic_sds_request *sci_req)
*/
ret_val = readl(scu_reg_base +
(SCU_TASK_CONTEXT_SRAM + offsetof(struct scu_task_context, type.ssp.data_offset)) +
((sizeof(struct scu_task_context)) * scic_sds_io_tag_get_index(sci_req->io_tag)));
((sizeof(struct scu_task_context)) * ISCI_TAG_TCI(sci_req->io_tag)));
}

return ret_val;
Expand Down Expand Up @@ -777,7 +777,7 @@ enum sci_status scic_sds_request_start(struct scic_sds_request *sci_req)
if (sci_req->io_tag != SCI_CONTROLLER_INVALID_IO_TAG) {
task_context = sci_req->task_context_buffer;

task_context->task_index = scic_sds_io_tag_get_index(sci_req->io_tag);
task_context->task_index = ISCI_TAG_TCI(sci_req->io_tag);

switch (task_context->protocol_type) {
case SCU_TASK_CONTEXT_PROTOCOL_SMP:
Expand Down Expand Up @@ -811,7 +811,7 @@ enum sci_status scic_sds_request_start(struct scic_sds_request *sci_req)
scic_sds_controller_copy_task_context(scic, sci_req);

/* Add to the post_context the io tag value */
sci_req->post_context |= scic_sds_io_tag_get_index(sci_req->io_tag);
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);
Expand Down Expand Up @@ -3325,7 +3325,7 @@ scu_smp_request_construct_task_context(struct scic_sds_request *sci_req,
SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
(scic_sds_port_get_index(sci_port) <<
SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
scic_sds_io_tag_get_index(sci_req->io_tag));
ISCI_TAG_TCI(sci_req->io_tag));
} else {
/*
* Build the task context now since we have already read
Expand Down

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