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ANDROID: scsi_debug: Support configuring the maximum segment size

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Add a kernel module parameter for configuring the maximum segment size.
This patch enables testing SCSI support for segments smaller than the
page size.

Bug: 308663717
Bug: 319125789
Change-Id: I1d9f1714876de72630cbf3150e7082b988dd7322
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Juan Yescas <jyescas@google.com>
This commit is contained in:
Bart Van Assche 2023-06-12 13:33:13 -07:00 committed by Juan Yescas
parent 8a2f432fcb
commit a265d535b7
1 changed files with 4 additions and 0 deletions
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4
drivers/scsi/scsi_debug.c
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@ -752,6 +752,7 @@ static int sdebug_host_max_queue; /* per host */
static int sdebug_lowest_aligned = DEF_LOWEST_ALIGNED;
static int sdebug_max_luns = DEF_MAX_LUNS;
static int sdebug_max_queue = SDEBUG_CANQUEUE; /* per submit queue */
static unsigned int sdebug_max_segment_size = BLK_MAX_SEGMENT_SIZE;
static unsigned int sdebug_medium_error_start = OPT_MEDIUM_ERR_ADDR;
static int sdebug_medium_error_count = OPT_MEDIUM_ERR_NUM;
static atomic_t retired_max_queue; /* if > 0 then was prior max_queue */
@ -5843,6 +5844,7 @@ module_param_named(lowest_aligned, sdebug_lowest_aligned, int, S_IRUGO);
module_param_named(lun_format, sdebug_lun_am_i, int, S_IRUGO | S_IWUSR);
module_param_named(max_luns, sdebug_max_luns, int, S_IRUGO | S_IWUSR);
module_param_named(max_queue, sdebug_max_queue, int, S_IRUGO | S_IWUSR);
module_param_named(max_segment_size, sdebug_max_segment_size, uint, S_IRUGO);
module_param_named(medium_error_count, sdebug_medium_error_count, int,
S_IRUGO | S_IWUSR);
module_param_named(medium_error_start, sdebug_medium_error_start, int,
@ -5919,6 +5921,7 @@ MODULE_PARM_DESC(lowest_aligned, "lowest aligned lba (def=0)");
MODULE_PARM_DESC(lun_format, "LUN format: 0->peripheral (def); 1 --> flat address method");
MODULE_PARM_DESC(max_luns, "number of LUNs per target to simulate(def=1)");
MODULE_PARM_DESC(max_queue, "max number of queued commands (1 to max(def))");
MODULE_PARM_DESC(max_segment_size, "max bytes in a single segment");
MODULE_PARM_DESC(medium_error_count, "count of sectors to return follow on MEDIUM error");
MODULE_PARM_DESC(medium_error_start, "starting sector number to return MEDIUM error");
MODULE_PARM_DESC(ndelay, "response delay in nanoseconds (def=0 -> ignore)");
@ -7818,6 +7821,7 @@ static int sdebug_driver_probe(struct device *dev)
sdebug_driver_template.can_queue = sdebug_max_queue;
sdebug_driver_template.cmd_per_lun = sdebug_max_queue;
sdebug_driver_template.max_segment_size = sdebug_max_segment_size;
if (!sdebug_clustering)
sdebug_driver_template.dma_boundary = PAGE_SIZE - 1;