[SRU][Zesty][Artful][Bionic][PATCH 1/3] scsi: cxlflash: Use derived maximum write same length

[Joseph Salisbury]

From: "Matthew R. Ochs" <mrochs at linux.vnet.ibm.com>

BugLink: http://bugs.launchpad.net/bugs/1730515

The existing write same routine within the cxlflash driver uses a
statically defined value for the maximum write same transfer length.
While this is close to the value reflected by the original device that
was supported by cxlflash, newer devices are capable of much larger
lengths. Supporting what the device is capable of offers substantial
performance improvement as the scrub routine within cxlflash operates on
'chunk size' units (256MB with a 4K sector size).

Instead of a #define, use the write same maximum length that is stored
in the block layer in units of 512 byte sectors. This value is initially
determined from the block limits VPD page during device discovery and
can also be manipulated from sysfs. As a general cleanup, designate the
timeout used when executing the write same command as constant.

Signed-off-by: Matthew R. Ochs <mrochs at linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn at linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen at oracle.com>
(cherry picked from commit 285e6670d0229b0157a9167eb8b2626b445a5a0e)
Signed-off-by: Joseph Salisbury <joseph.salisbury at canonical.com>
---
 drivers/scsi/cxlflash/sislite.h | 3 ---
 drivers/scsi/cxlflash/vlun.c    | 6 ++++--
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/cxlflash/sislite.h b/drivers/scsi/cxlflash/sislite.h
index 09daa86..bedf1ce 100644
--- a/drivers/scsi/cxlflash/sislite.h
+++ b/drivers/scsi/cxlflash/sislite.h
@@ -548,7 +548,4 @@ struct sisl_rht_entry_f1 {
 #define TMF_LUN_RESET  0x1U
 #define TMF_CLEAR_ACA  0x2U
 
-
-#define SISLITE_MAX_WS_BLOCKS 512
-
 #endif /* _SISLITE_H */
diff --git a/drivers/scsi/cxlflash/vlun.c b/drivers/scsi/cxlflash/vlun.c
index 8de6a80..77e3689 100644
--- a/drivers/scsi/cxlflash/vlun.c
+++ b/drivers/scsi/cxlflash/vlun.c
@@ -428,12 +428,14 @@ static int write_same16(struct scsi_device *sdev,
 	u8 *sense_buf = NULL;
 	int rc = 0;
 	int result = 0;
-	int ws_limit = SISLITE_MAX_WS_BLOCKS;
 	u64 offset = lba;
 	int left = nblks;
-	u32 to = sdev->request_queue->rq_timeout;
 	struct cxlflash_cfg *cfg = shost_priv(sdev->host);
 	struct device *dev = &cfg->dev->dev;
+	const u32 s = ilog2(sdev->sector_size) - 9;
+	const u32 to = sdev->request_queue->rq_timeout;
+	const u32 ws_limit = blk_queue_get_max_sectors(sdev->request_queue,
+						       REQ_OP_WRITE_SAME) >> s;
 
 	cmd_buf = kzalloc(CMD_BUFSIZE, GFP_KERNEL);
 	scsi_cmd = kzalloc(MAX_COMMAND_SIZE, GFP_KERNEL);
-- 
2.7.4