* SECTION: prototypes for static functions of dasd.c
*/
static int dasd_alloc_queue(struct dasd_block *);
-static void dasd_setup_queue(struct dasd_block *);
static void dasd_free_queue(struct dasd_block *);
static int dasd_flush_block_queue(struct dasd_block *);
static void dasd_device_tasklet(unsigned long);
}
return rc;
}
- dasd_setup_queue(block);
+ if (device->discipline->setup_blk_queue)
+ device->discipline->setup_blk_queue(block);
set_capacity(block->gdp,
block->blocks << block->s2b_shift);
device->state = DASD_STATE_READY;
return 0;
}
-/*
- * Allocate and initialize request queue.
- */
-static void dasd_setup_queue(struct dasd_block *block)
-{
- unsigned int logical_block_size = block->bp_block;
- struct request_queue *q = block->request_queue;
- unsigned int max_bytes, max_discard_sectors;
- int max;
-
- 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
- * only need one ccw per track
- * so the max_hw_sectors are
- * 2048 x 512B = 1024kB = 16 tracks
- */
- max = 2048;
- } else {
- max = block->base->discipline->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 we can translate each segement into
- * one idaw/tidaw
- */
- blk_queue_max_segment_size(q, PAGE_SIZE);
- blk_queue_segment_boundary(q, PAGE_SIZE - 1);
-
- /* Only activate blocklayer discard support for devices that support it */
- if (block->base->features & DASD_FEATURE_DISCARD) {
- q->limits.discard_granularity = logical_block_size;
- q->limits.discard_alignment = PAGE_SIZE;
-
- /* Calculate max_discard_sectors and make it PAGE aligned */
- max_bytes = USHRT_MAX * logical_block_size;
- max_bytes = ALIGN(max_bytes, PAGE_SIZE) - 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);
- blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
- }
-}
-
/*
* Deactivate and free request queue.
*/
"dump sense not available for DIAG data");
}
+/*
+ * Initialize block layer request queue.
+ */
+static void dasd_diag_setup_blk_queue(struct dasd_block *block)
+{
+ unsigned int logical_block_size = block->bp_block;
+ struct request_queue *q = block->request_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);
+}
+
static struct dasd_discipline dasd_diag_discipline = {
.owner = THIS_MODULE,
.name = "DIAG",
.ebcname = "DIAG",
- .max_blocks = DIAG_MAX_BLOCKS,
.check_device = dasd_diag_check_device,
.verify_path = dasd_generic_verify_path,
.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,
dasd_schedule_requeue(device);
}
+/*
+ * Initialize block layer request queue.
+ */
+static void dasd_eckd_setup_blk_queue(struct dasd_block *block)
+{
+ unsigned int logical_block_size = block->bp_block;
+ struct request_queue *q = block->request_queue;
+ struct dasd_device *device = block->base;
+ int max;
+
+ if (device->features & DASD_FEATURE_USERAW) {
+ /*
+ * the max_blocks value for raw_track access is 256
+ * it is higher than the native ECKD value because we
+ * only need one ccw per track
+ * 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;
+ }
+ 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);
+}
+
static struct ccw_driver dasd_eckd_driver = {
.driver = {
.name = "dasd-eckd",
.int_class = IRQIO_DAS,
};
-/*
- * max_blocks is dependent on the amount of storage that is available
- * in the static io buffer for each device. Currently each device has
- * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
- * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
- * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
- * addition we have one define extent ccw + 16 bytes of data and one
- * locate record ccw + 16 bytes of data. That makes:
- * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
- * We want to fit two into the available memory so that we can immediately
- * start the next request if one finishes off. That makes 249.5 blocks
- * for one request. Give a little safety and the result is 240.
- */
static struct dasd_discipline dasd_eckd_discipline = {
.owner = THIS_MODULE,
.name = "ECKD",
.ebcname = "ECKD",
- .max_blocks = 190,
.check_device = dasd_eckd_check_characteristics,
.uncheck_device = dasd_eckd_uncheck_device,
.do_analysis = dasd_eckd_do_analysis,
.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,
.fill_geometry = dasd_eckd_fill_geometry,
.start_IO = dasd_start_IO,
.term_IO = dasd_term_IO,
#define DASD_ECKD_PATH_THRHLD 256
#define DASD_ECKD_PATH_INTERVAL 300
+/*
+ * Maximum number of blocks to be chained
+ */
+#define DASD_ECKD_MAX_BLOCKS 190
+#define DASD_ECKD_MAX_BLOCKS_RAW 256
+
/*****************************************************************************
* SECTION: Type Definitions
****************************************************************************/
}
/*
- * max_blocks is dependent on the amount of storage that is available
- * in the static io buffer for each device. Currently each device has
- * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
- * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
- * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
- * addition we have one define extent ccw + 16 bytes of data and a
- * locate record ccw for each block (stupid devices!) + 16 bytes of data.
- * That makes:
- * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
- * We want to fit two into the available memory so that we can immediately
- * start the next request if one finishes off. That makes 100.1 blocks
- * for one request. Give a little safety and the result is 96.
+ * Initialize block layer request queue.
*/
+static void dasd_fba_setup_blk_queue(struct dasd_block *block)
+{
+ unsigned int logical_block_size = block->bp_block;
+ struct request_queue *q = block->request_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;
+ q->limits.discard_alignment = PAGE_SIZE;
+
+ /* Calculate max_discard_sectors and make it PAGE aligned */
+ max_bytes = USHRT_MAX * logical_block_size;
+ max_bytes = ALIGN(max_bytes, PAGE_SIZE) - 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);
+ blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
+}
+
static struct dasd_discipline dasd_fba_discipline = {
.owner = THIS_MODULE,
.name = "FBA ",
.ebcname = "FBA ",
- .max_blocks = 96,
.check_device = dasd_fba_check_characteristics,
.do_analysis = dasd_fba_do_analysis,
.verify_path = dasd_generic_verify_path,
+ .setup_blk_queue = dasd_fba_setup_blk_queue,
.fill_geometry = dasd_fba_fill_geometry,
.start_IO = dasd_start_IO,
.term_IO = dasd_term_IO,
#ifndef DASD_FBA_H
#define DASD_FBA_H
+/*
+ * Maximum number of blocks to be chained
+ */
+#define DASD_FBA_MAX_BLOCKS 96
+
struct DE_fba_data {
struct {
unsigned char perm:2; /* Permissions on this extent */
struct module *owner;
char ebcname[8]; /* a name used for tagging and printks */
char name[8]; /* a name used for tagging and printks */
- int max_blocks; /* maximum number of blocks to be chained */
struct list_head list; /* used for list of disciplines */
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 *);
/* (struct dasd_device *);
* Device operation functions. build_cp creates a ccw chain for
* a block device request, start_io starts the request and
projects / people / ms / linux.git / commitdiff
