powerpc-utils/SOURCES/0001-drmgr-don-t-open-sysfs-file-for-each-command.patch
2021-11-25 11:51:21 +00:00

88 lines
2.5 KiB
Diff

From 014e8ba4580c7917e258df084776c16079dc07ce Mon Sep 17 00:00:00 2001
From: Laurent Dufour <ldufour@linux.ibm.com>
Date: Tue, 24 Nov 2020 19:28:48 +0100
Subject: [PATCH 1/3] drmgr: don't open sysfs file for each command
The new __do_kernel_dlpar() API will be used in later commit to remove by
DRC Index LMB per LMB. This will avoiding opennig and closing the fd each
time.
The fd closing will now be done at the process exit time.
In addition add an optinal parameter to silently ignore some error.
Also, change the log level of the "success" message to debug to match
the previous one saying "Trying.."
Signed-off-by: Laurent Dufour <ldufour@linux.ibm.com>
---
src/drmgr/common.c | 22 +++++++++++++---------
src/drmgr/dr.h | 3 ++-
2 files changed, 15 insertions(+), 10 deletions(-)
diff --git a/src/drmgr/common.c b/src/drmgr/common.c
index 5e8135bcf77e..25d244cb2f57 100644
--- a/src/drmgr/common.c
+++ b/src/drmgr/common.c
@@ -1469,32 +1469,36 @@ int kernel_dlpar_exists(void)
* @param cmd command string to write to sysfs
* @returns 0 on success, !0 otherwise
*/
-int do_kernel_dlpar(const char *cmd, int cmdlen)
+int __do_kernel_dlpar(const char *cmd, int cmdlen, int silent_error)
{
- int fd, rc;
+ static int fd = -1;
+ int rc;
int my_errno;
say(DEBUG, "Initiating kernel DLPAR \"%s\"\n", cmd);
/* write to file */
- fd = open(SYSFS_DLPAR_FILE, O_WRONLY);
- if (fd <= 0) {
- say(ERROR, "Could not open %s to initiate DLPAR request\n",
- SYSFS_DLPAR_FILE);
- return -1;
+ if (fd == -1) {
+ fd = open(SYSFS_DLPAR_FILE, O_WRONLY);
+ if (fd <= 0) {
+ say(ERROR, "Could not open %s to initiate DLPAR request\n",
+ SYSFS_DLPAR_FILE);
+ return -1;
+ }
}
rc = write(fd, cmd, cmdlen);
my_errno = errno;
- close(fd);
if (rc <= 0) {
+ if (silent_error)
+ return (my_errno == 0) ? -1 : -my_errno;
/* write does not set errno for rc == 0 */
say(ERROR, "Failed to write to %s: %s\n", SYSFS_DLPAR_FILE,
(rc == 0) ? "wrote 0 bytes" : strerror(my_errno));
return -1;
}
- say(INFO, "Success\n");
+ say(DEBUG, "Success\n");
return 0;
}
diff --git a/src/drmgr/dr.h b/src/drmgr/dr.h
index f171bfea73c3..00d2fffc9919 100644
--- a/src/drmgr/dr.h
+++ b/src/drmgr/dr.h
@@ -172,5 +172,6 @@ enum drc_type to_drc_type(const char *);
int handle_prrn(void);
int kernel_dlpar_exists(void);
-int do_kernel_dlpar(const char *, int);
+int __do_kernel_dlpar(const char *, int, int);
+#define do_kernel_dlpar(c, l) __do_kernel_dlpar(c, l, 0)
#endif
--
2.29.2