diff mbox series

[v3,06/18] scsi: support service action in scsi_report_opcode()

Message ID 20230124190308.127318-7-niklas.cassel@wdc.com (mailing list archive)
State Changes Requested
Headers show
Series Add Command Duration Limits support | expand

Commit Message

Niklas Cassel Jan. 24, 2023, 7:02 p.m. UTC 
From: Damien Le Moal <damien.lemoal@opensource.wdc.com>

The REPORT_SUPPORTED_OPERATION_CODES command allows checking for support
of commands that have the same opcode but different service actions,
such as READ 32 and WRITE 32. However, the current implementation of
scsi_report_opcode() only allows checking an operation code without a
service action differentiation.

Add the "sa" argument to scsi_report_opcode() to allow passing a service
action. If a non-zero service action is specified, the reporting
options field value is set to 3 to have the service action field taken
into account by the device. If no service action field is specified
(zero), the reporting options field is set to 1 as before.

Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/scsi.c        | 28 +++++++++++++++++++---------
 drivers/scsi/sd.c          | 10 +++++-----
 include/scsi/scsi_device.h |  5 +++--
 3 files changed, 27 insertions(+), 16 deletions(-)

Comments

Bart Van Assche Jan. 24, 2023, 7:36 p.m. UTC | #1 
On 1/24/23 11:02, Niklas Cassel wrote:
> From: Damien Le Moal <damien.lemoal@opensource.wdc.com>
> 
> The REPORT_SUPPORTED_OPERATION_CODES command allows checking for support
> of commands that have the same opcode but different service actions,
> such as READ 32 and WRITE 32. However, the current implementation of
> scsi_report_opcode() only allows checking an operation code without a
> service action differentiation.
> 
> Add the "sa" argument to scsi_report_opcode() to allow passing a service
> action. If a non-zero service action is specified, the reporting
> options field value is set to 3 to have the service action field taken
> into account by the device. If no service action field is specified
> (zero), the reporting options field is set to 1 as before.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>
diff mbox series

Patch

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 00ee47a04403..579c3153b9f3 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -494,18 +494,22 @@  void scsi_attach_vpd(struct scsi_device *sdev)
 }
 
 /**
- * scsi_report_opcode - Find out if a given command opcode is supported
+ * scsi_report_opcode - Find out if a given command is supported
  * @sdev:	scsi device to query
  * @buffer:	scratch buffer (must be at least 20 bytes long)
  * @len:	length of buffer
- * @opcode:	opcode for command to look up
- *
- * Uses the REPORT SUPPORTED OPERATION CODES to look up the given
- * opcode. Returns -EINVAL if RSOC fails, 0 if the command opcode is
- * unsupported and 1 if the device claims to support the command.
+ * @opcode:	opcode for the command to look up
+ * @sa:		service action for the command to look up
+ *
+ * Uses the REPORT SUPPORTED OPERATION CODES to check support for the
+ * command identified with @opcode and @sa. If the command does not
+ * have a service action, @sa must be 0. Returns -EINVAL if RSOC fails,
+ * 0 if the command is not supported and 1 if the device claims to
+ * support the command.
  */
 int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
-		       unsigned int len, unsigned char opcode)
+		       unsigned int len, unsigned char opcode,
+		       unsigned short sa)
 {
 	unsigned char cmd[16];
 	struct scsi_sense_hdr sshdr;
@@ -529,8 +533,14 @@  int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
 	memset(cmd, 0, 16);
 	cmd[0] = MAINTENANCE_IN;
 	cmd[1] = MI_REPORT_SUPPORTED_OPERATION_CODES;
-	cmd[2] = 1;		/* One command format */
-	cmd[3] = opcode;
+	if (!sa) {
+		cmd[2] = 1;	/* One command format */
+		cmd[3] = opcode;
+	} else {
+		cmd[2] = 3;	/* One command format with service action */
+		cmd[3] = opcode;
+		put_unaligned_be16(sa, &cmd[4]);
+	}
 	put_unaligned_be32(request_len, &cmd[6]);
 	memset(buffer, 0, len);
 
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 7582e02a8d5a..45945bfeee92 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -3058,7 +3058,7 @@  static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
 		return;
 	}
 
-	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
+	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY, 0) < 0) {
 		struct scsi_vpd *vpd;
 
 		sdev->no_report_opcodes = 1;
@@ -3074,10 +3074,10 @@  static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
 		rcu_read_unlock();
 	}
 
-	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
+	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16, 0) == 1)
 		sdkp->ws16 = 1;
 
-	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
+	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME, 0) == 1)
 		sdkp->ws10 = 1;
 }
 
@@ -3089,9 +3089,9 @@  static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
 		return;
 
 	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
-			SECURITY_PROTOCOL_IN) == 1 &&
+			SECURITY_PROTOCOL_IN, 0) == 1 &&
 	    scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
-			SECURITY_PROTOCOL_OUT) == 1)
+			SECURITY_PROTOCOL_OUT, 0) == 1)
 		sdkp->security = 1;
 }
 
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 15e005982032..8978c2a58702 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -431,8 +431,9 @@  extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
 				int retries, struct scsi_sense_hdr *sshdr);
 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
 			     int buf_len);
-extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
-			      unsigned int len, unsigned char opcode);
+int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
+		       unsigned int len, unsigned char opcode,
+		       unsigned short sa);
 extern int scsi_device_set_state(struct scsi_device *sdev,
 				 enum scsi_device_state state);
 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,