[PATCH 2/3] dasd: move queue setup to common code

Christoph Hellwig
2024-02-28T13:37:46Z

Most of the code in setup_blk_queue is shared between all disciplines.
Move it to common code and leave a method to query the maximum number
of transferable blocks, and a flag to indicate discard support.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/s390/block/dasd.c | 29 +++++++++++++++++++++++++++--
drivers/s390/block/dasd_diag.c | 22 +++-------------------
drivers/s390/block/dasd_eckd.c | 29 ++++++-----------------------
drivers/s390/block/dasd_fba.c | 33 ++++-----------------------------
drivers/s390/block/dasd_int.h | 6 ++----
5 files changed, 42 insertions(+), 77 deletions(-)

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index e754e4f81b2dff..bdeab447adfc9d 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -308,6 +308,7 @@ static int dasd_state_basic_to_known(struct dasd_device *device)
static int dasd_state_basic_to_ready(struct dasd_device *device)
{
struct dasd_block *block = device->block;
+ struct request_queue *q;
int rc = 0;

/* make disk known with correct capacity */
@@ -327,8 +328,32 @@ static int dasd_state_basic_to_ready(struct dasd_device *device)
goto out;
}

- if (device->discipline->setup_blk_queue)
- device->discipline->setup_blk_queue(block);
+ q = block->gdp->queue;
+ blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
+ q->limits.max_dev_sectors = device->discipline->max_sectors(block);
+ blk_queue_max_hw_sectors(q, q->limits.max_dev_sectors);
+ blk_queue_logical_block_size(q, block->bp_block);
+ blk_queue_max_segments(q, USHRT_MAX);
+
+ /* With page sized segments each segment can be translated into one idaw/tidaw */
+ blk_queue_max_segment_size(q, PAGE_SIZE);
+ blk_queue_segment_boundary(q, PAGE_SIZE - 1);
+ blk_queue_dma_alignment(q, PAGE_SIZE - 1);
+
+ if (device->discipline->has_discard) {
+ unsigned int max_bytes, max_discard_sectors;
+
+ q->limits.discard_granularity = block->bp_block;
+
+ /* Calculate max_discard_sectors and make it PAGE aligned */
+ max_bytes = USHRT_MAX * block->bp_block;
+ max_bytes = ALIGN_DOWN(max_bytes, PAGE_SIZE);
+ max_discard_sectors = max_bytes / block->bp_block;
+
+ blk_queue_max_discard_sectors(q, max_discard_sectors);
+ blk_queue_max_write_zeroes_sectors(q, max_discard_sectors);
+ }
+
set_capacity(block->gdp, block->blocks << block->s2b_shift);
device->state = DASD_STATE_READY;

diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c
index 041088c7e90915..ea4b1d01bb767e 100644
--- a/drivers/s390/block/dasd_diag.c
+++ b/drivers/s390/block/dasd_diag.c
@@ -617,25 +617,9 @@ dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
"dump sense not available for DIAG data");
}

-/*
- * Initialize block layer request queue.
- */
-static void dasd_diag_setup_blk_queue(struct dasd_block *block)
+static unsigned int dasd_diag_max_sectors(struct dasd_block *block)
{
- unsigned int logical_block_size = block->bp_block;
- struct request_queue *q = block->gdp->queue;
- int max;
-
- max = DIAG_MAX_BLOCKS << block->s2b_shift;
- blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
- q->limits.max_dev_sectors = max;
- blk_queue_logical_block_size(q, logical_block_size);
- blk_queue_max_hw_sectors(q, max);
- blk_queue_max_segments(q, USHRT_MAX);
- /* With page sized segments each segment can be translated into one idaw/tidaw */
- blk_queue_max_segment_size(q, PAGE_SIZE);
- blk_queue_segment_boundary(q, PAGE_SIZE - 1);
- blk_queue_dma_alignment(q, PAGE_SIZE - 1);
+ return DIAG_MAX_BLOCKS << block->s2b_shift;
}

static int dasd_diag_pe_handler(struct dasd_device *device,
@@ -648,10 +632,10 @@ static struct dasd_discipline dasd_diag_discipline = {
.owner = THIS_MODULE,
.name = "DIAG",
.ebcname = "DIAG",
+ .max_sectors = dasd_diag_max_sectors,
.check_device = dasd_diag_check_device,
.pe_handler = dasd_diag_pe_handler,
.fill_geometry = dasd_diag_fill_geometry,
- .setup_blk_queue = dasd_diag_setup_blk_queue,
.start_IO = dasd_start_diag,
.term_IO = dasd_diag_term_IO,
.handle_terminated_request = dasd_diag_handle_terminated_request,
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 8aade17d885cc9..373c1a86c33ed5 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -6826,17 +6826,9 @@ static void dasd_eckd_handle_hpf_error(struct dasd_device *device,
dasd_schedule_requeue(device);
}

-/*
- * Initialize block layer request queue.
- */
-static void dasd_eckd_setup_blk_queue(struct dasd_block *block)
+static unsigned int dasd_eckd_max_sectors(struct dasd_block *block)
{
- unsigned int logical_block_size = block->bp_block;
- struct request_queue *q = block->gdp->queue;
- struct dasd_device *device = block->base;
- int max;
-
- if (device->features & DASD_FEATURE_USERAW) {
+ if (block->base->features & DASD_FEATURE_USERAW) {
/*
* the max_blocks value for raw_track access is 256
* it is higher than the native ECKD value because we
@@ -6844,19 +6836,10 @@ static void dasd_eckd_setup_blk_queue(struct dasd_block *block)
* so the max_hw_sectors are
* 2048 x 512B = 1024kB = 16 tracks
*/
- max = DASD_ECKD_MAX_BLOCKS_RAW << block->s2b_shift;
- } else {
- max = DASD_ECKD_MAX_BLOCKS << block->s2b_shift;
+ return DASD_ECKD_MAX_BLOCKS_RAW << block->s2b_shift;
}
- blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
- q->limits.max_dev_sectors = max;
- blk_queue_logical_block_size(q, logical_block_size);
- blk_queue_max_hw_sectors(q, max);
- blk_queue_max_segments(q, USHRT_MAX);
- /* With page sized segments each segment can be translated into one idaw/tidaw */
- blk_queue_max_segment_size(q, PAGE_SIZE);
- blk_queue_segment_boundary(q, PAGE_SIZE - 1);
- blk_queue_dma_alignment(q, PAGE_SIZE - 1);
+
+ return DASD_ECKD_MAX_BLOCKS << block->s2b_shift;
}

static struct ccw_driver dasd_eckd_driver = {
@@ -6888,7 +6871,7 @@ static struct dasd_discipline dasd_eckd_discipline = {
.basic_to_ready = dasd_eckd_basic_to_ready,
.online_to_ready = dasd_eckd_online_to_ready,
.basic_to_known = dasd_eckd_basic_to_known,
- .setup_blk_queue = dasd_eckd_setup_blk_queue,
+ .max_sectors = dasd_eckd_max_sectors,
.fill_geometry = dasd_eckd_fill_geometry,
.start_IO = dasd_start_IO,
.term_IO = dasd_term_IO,
diff --git a/drivers/s390/block/dasd_fba.c b/drivers/s390/block/dasd_fba.c
index 045e548630dfb1..bcbb2f8e91feb6 100644
--- a/drivers/s390/block/dasd_fba.c
+++ b/drivers/s390/block/dasd_fba.c
@@ -748,35 +748,9 @@ dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
free_page((unsigned long) page);
}

-/*
- * Initialize block layer request queue.
- */
-static void dasd_fba_setup_blk_queue(struct dasd_block *block)
+static unsigned int dasd_fba_max_sectors(struct dasd_block *block)
{
- unsigned int logical_block_size = block->bp_block;
- struct request_queue *q = block->gdp->queue;
- unsigned int max_bytes, max_discard_sectors;
- int max;
-
- max = DASD_FBA_MAX_BLOCKS << block->s2b_shift;
- blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
- q->limits.max_dev_sectors = max;
- blk_queue_logical_block_size(q, logical_block_size);
- blk_queue_max_hw_sectors(q, max);
- blk_queue_max_segments(q, USHRT_MAX);
- /* With page sized segments each segment can be translated into one idaw/tidaw */
- blk_queue_max_segment_size(q, PAGE_SIZE);
- blk_queue_segment_boundary(q, PAGE_SIZE - 1);
-
- q->limits.discard_granularity = logical_block_size;
-
- /* Calculate max_discard_sectors and make it PAGE aligned */
- max_bytes = USHRT_MAX * logical_block_size;
- max_bytes = ALIGN_DOWN(max_bytes, PAGE_SIZE);
- max_discard_sectors = max_bytes / logical_block_size;
-
- blk_queue_max_discard_sectors(q, max_discard_sectors);
- blk_queue_max_write_zeroes_sectors(q, max_discard_sectors);
+ return DASD_FBA_MAX_BLOCKS << block->s2b_shift;
}

static int dasd_fba_pe_handler(struct dasd_device *device,
@@ -789,10 +763,11 @@ static struct dasd_discipline dasd_fba_discipline = {
.owner = THIS_MODULE,
.name = "FBA ",
.ebcname = "FBA ",
+ .has_discard = true,
.check_device = dasd_fba_check_characteristics,
.do_analysis = dasd_fba_do_analysis,
.pe_handler = dasd_fba_pe_handler,
- .setup_blk_queue = dasd_fba_setup_blk_queue,
+ .max_sectors = dasd_fba_max_sectors,
.fill_geometry = dasd_fba_fill_geometry,
.start_IO = dasd_start_IO,
.term_IO = dasd_term_IO,
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
index a6c5f1fa2d8798..b56d683a991dfd 100644
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -293,6 +293,7 @@ struct dasd_discipline {
struct module *owner;
char ebcname[8]; /* a name used for tagging and printks */
char name[8]; /* a name used for tagging and printks */
+ bool has_discard;

struct list_head list; /* used for list of disciplines */

@@ -331,10 +332,7 @@ struct dasd_discipline {
int (*online_to_ready) (struct dasd_device *);
int (*basic_to_known)(struct dasd_device *);

- /*
- * Initialize block layer request queue.
- */
- void (*setup_blk_queue)(struct dasd_block *);
+ unsigned int (*max_sectors)(struct dasd_block *);
/* (struct dasd_device *);
* Device operation functions. build_cp creates a ccw chain for
* a block device request, start_io starts the request and
--
2.39.2