lkml.org 
[lkml]   [2012]   [Jul]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v4 1/4] block: add a flag to identify PM request
Date
Add a flag REQ_PM to identify the request is PM related.
As an example, modify scsi code to use this flag.

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
---
drivers/scsi/scsi_lib.c | 25 ++++++++++++++++++++++---
drivers/scsi/sd.c | 9 +++++----
include/linux/blk_types.h | 2 ++
include/scsi/scsi_device.h | 4 ++++
4 files changed, 33 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 6dfb978..45538e5 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -256,10 +256,10 @@ int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
EXPORT_SYMBOL(scsi_execute);


-int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
+static int __scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
int data_direction, void *buffer, unsigned bufflen,
struct scsi_sense_hdr *sshdr, int timeout, int retries,
- int *resid)
+ int *resid, int flags)
{
char *sense = NULL;
int result;
@@ -270,15 +270,34 @@ int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
return DRIVER_ERROR << 24;
}
result = scsi_execute(sdev, cmd, data_direction, buffer, bufflen,
- sense, timeout, retries, 0, resid);
+ sense, timeout, retries, flags, resid);
if (sshdr)
scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, sshdr);

kfree(sense);
return result;
}
+
+int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
+ int data_direction, void *buffer, unsigned bufflen,
+ struct scsi_sense_hdr *sshdr, int timeout, int retries,
+ int *resid)
+{
+ return __scsi_execute_req(sdev, cmd, data_direction, buffer, bufflen,
+ sshdr, timeout, retries, resid, 0);
+}
EXPORT_SYMBOL(scsi_execute_req);

+int scsi_execute_req_flag(struct scsi_device *sdev, const unsigned char *cmd,
+ int data_direction, void *buffer, unsigned bufflen,
+ struct scsi_sense_hdr *sshdr, int timeout, int retries,
+ int *resid, int flags)
+{
+ return __scsi_execute_req(sdev, cmd, data_direction, buffer, bufflen,
+ sshdr, timeout, retries, resid, flags);
+}
+EXPORT_SYMBOL(scsi_execute_req_flag);
+
/*
* Function: scsi_init_cmd_errh()
*
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 6f72b80..bf8413a 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1270,8 +1270,9 @@ static int sd_sync_cache(struct scsi_disk *sdkp)
* Leave the rest of the command zero to indicate
* flush everything.
*/
- res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
- SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
+ res = scsi_execute_req_flag(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
+ SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL,
+ REQ_PM);
if (res == 0)
break;
}
@@ -2815,8 +2816,8 @@ static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
if (!scsi_device_online(sdp))
return -ENODEV;

- res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
- SD_TIMEOUT, SD_MAX_RETRIES, NULL);
+ res = scsi_execute_req_flag(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
+ SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
if (res) {
sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
sd_print_result(sdkp, res);
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 0edb65d..ed53dca 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -160,6 +160,7 @@ enum rq_flag_bits {
__REQ_FLUSH_SEQ, /* request for flush sequence */
__REQ_IO_STAT, /* account I/O stat */
__REQ_MIXED_MERGE, /* merge of different types, fail separately */
+ __REQ_PM, /* runtime pm request */
__REQ_NR_BITS, /* stops here */
};

@@ -201,5 +202,6 @@ enum rq_flag_bits {
#define REQ_IO_STAT (1 << __REQ_IO_STAT)
#define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE)
#define REQ_SECURE (1 << __REQ_SECURE)
+#define REQ_PM (1 << __REQ_PM)

#endif /* __LINUX_BLK_TYPES_H */
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index ba96988..e7fdff5 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -388,6 +388,10 @@ extern int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
int data_direction, void *buffer, unsigned bufflen,
struct scsi_sense_hdr *, int timeout, int retries,
int *resid);
+extern int scsi_execute_req_flag(struct scsi_device *sdev, const unsigned char *cmd,
+ int data_direction, void *buffer, unsigned bufflen,
+ struct scsi_sense_hdr *, int timeout, int retries,
+ int *resid, int flags);

#ifdef CONFIG_PM_RUNTIME
extern int scsi_autopm_get_device(struct scsi_device *);
--
1.7.10


\
 
 \ /
  Last update: 2012-07-05 10:21    [W:0.057 / U:9.196 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site