From: Kees Cook <keescook@chromium.org>
To: WeiXiong Liao <liaoweixiong@allwinnertech.com>
Cc: Kees Cook <keescook@chromium.org>,
Anton Vorontsov <anton@enomsg.org>,
Colin Cross <ccross@android.com>, Tony Luck <tony.luck@intel.com>,
Jonathan Corbet <corbet@lwn.net>,
Miquel Raynal <miquel.raynal@bootlin.com>,
Richard Weinberger <richard@nod.at>,
Vignesh Raghavendra <vigneshr@ti.com>,
Petr Mladek <pmladek@suse.com>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
Rob Herring <robh@kernel.org>,
Pavel Tatashin <pasha.tatashin@soleen.com>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mtd@lists.infradead.org
Subject: [PATCH v7 06/18] pstore/ftrace: Provide ftrace log merging routine
Date: Sun, 10 May 2020 13:24:24 -0700 [thread overview]
Message-ID: <20200510202436.63222-7-keescook@chromium.org> (raw)
In-Reply-To: <20200510202436.63222-1-keescook@chromium.org>
Move the ftrace log merging logic out of pstore/ram into pstore/ftrace
so other backends can use it, like pstore/zone.
Signed-off-by: Kees Cook <keescook@chromium.org>
---
fs/pstore/ftrace.c | 54 +++++++++++++++++++++++++++++++++++++++++
fs/pstore/internal.h | 9 +++++++
fs/pstore/ram.c | 57 +++-----------------------------------------
3 files changed, 66 insertions(+), 54 deletions(-)
diff --git a/fs/pstore/ftrace.c b/fs/pstore/ftrace.c
index bfbfc2698070..5c0450701293 100644
--- a/fs/pstore/ftrace.c
+++ b/fs/pstore/ftrace.c
@@ -16,6 +16,7 @@
#include <linux/debugfs.h>
#include <linux/err.h>
#include <linux/cache.h>
+#include <linux/slab.h>
#include <asm/barrier.h>
#include "internal.h"
@@ -132,3 +133,56 @@ void pstore_unregister_ftrace(void)
debugfs_remove_recursive(pstore_ftrace_dir);
}
+
+ssize_t pstore_ftrace_combine_log(char **dest_log, size_t *dest_log_size,
+ const char *src_log, size_t src_log_size)
+{
+ size_t dest_size, src_size, total, dest_off, src_off;
+ size_t dest_idx = 0, src_idx = 0, merged_idx = 0;
+ void *merged_buf;
+ struct pstore_ftrace_record *drec, *srec, *mrec;
+ size_t record_size = sizeof(struct pstore_ftrace_record);
+
+ dest_off = *dest_log_size % record_size;
+ dest_size = *dest_log_size - dest_off;
+
+ src_off = src_log_size % record_size;
+ src_size = src_log_size - src_off;
+
+ total = dest_size + src_size;
+ merged_buf = kmalloc(total, GFP_KERNEL);
+ if (!merged_buf)
+ return -ENOMEM;
+
+ drec = (struct pstore_ftrace_record *)(*dest_log + dest_off);
+ srec = (struct pstore_ftrace_record *)(src_log + src_off);
+ mrec = (struct pstore_ftrace_record *)(merged_buf);
+
+ while (dest_size > 0 && src_size > 0) {
+ if (pstore_ftrace_read_timestamp(&drec[dest_idx]) <
+ pstore_ftrace_read_timestamp(&srec[src_idx])) {
+ mrec[merged_idx++] = drec[dest_idx++];
+ dest_size -= record_size;
+ } else {
+ mrec[merged_idx++] = srec[src_idx++];
+ src_size -= record_size;
+ }
+ }
+
+ while (dest_size > 0) {
+ mrec[merged_idx++] = drec[dest_idx++];
+ dest_size -= record_size;
+ }
+
+ while (src_size > 0) {
+ mrec[merged_idx++] = srec[src_idx++];
+ src_size -= record_size;
+ }
+
+ kfree(*dest_log);
+ *dest_log = merged_buf;
+ *dest_log_size = total;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pstore_ftrace_combine_log);
diff --git a/fs/pstore/internal.h b/fs/pstore/internal.h
index 8efd72d93b10..7fb219042f13 100644
--- a/fs/pstore/internal.h
+++ b/fs/pstore/internal.h
@@ -12,9 +12,18 @@ extern unsigned long kmsg_bytes;
#ifdef CONFIG_PSTORE_FTRACE
extern void pstore_register_ftrace(void);
extern void pstore_unregister_ftrace(void);
+ssize_t pstore_ftrace_combine_log(char **dest_log, size_t *dest_log_size,
+ const char *src_log, size_t src_log_size);
#else
static inline void pstore_register_ftrace(void) {}
static inline void pstore_unregister_ftrace(void) {}
+static inline ssize_t
+pstore_ftrace_combine_log(char **dest_log, size_t *dest_log_size,
+ const char *src_log, size_t src_log_size)
+{
+ *dest_log_size = 0;
+ return 0;
+}
#endif
#ifdef CONFIG_PSTORE_PMSG
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 672ad80646c5..b7929fdc0c72 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -21,6 +21,7 @@
#include <linux/pstore_ram.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include "internal.h"
#define RAMOOPS_KERNMSG_HDR "===="
#define MIN_MEM_SIZE 4096UL
@@ -172,59 +173,6 @@ static bool prz_ok(struct persistent_ram_zone *prz)
persistent_ram_ecc_string(prz, NULL, 0));
}
-static
-ssize_t ftrace_log_combine(char **dest_log, size_t *dest_log_size,
- const char *src_log, size_t src_log_size)
-{
- size_t dest_size, src_size, total, dest_off, src_off;
- size_t dest_idx = 0, src_idx = 0, merged_idx = 0;
- void *merged_buf;
- struct pstore_ftrace_record *drec, *srec, *mrec;
- size_t record_size = sizeof(struct pstore_ftrace_record);
-
- dest_off = *dest_log_size % record_size;
- dest_size = *dest_log_size - dest_off;
-
- src_off = src_log_size % record_size;
- src_size = src_log_size - src_off;
-
- total = dest_size + src_size;
- merged_buf = kmalloc(total, GFP_KERNEL);
- if (!merged_buf)
- return -ENOMEM;
-
- drec = (struct pstore_ftrace_record *)(*dest_log + dest_off);
- srec = (struct pstore_ftrace_record *)(src_log + src_off);
- mrec = (struct pstore_ftrace_record *)(merged_buf);
-
- while (dest_size > 0 && src_size > 0) {
- if (pstore_ftrace_read_timestamp(&drec[dest_idx]) <
- pstore_ftrace_read_timestamp(&srec[src_idx])) {
- mrec[merged_idx++] = drec[dest_idx++];
- dest_size -= record_size;
- } else {
- mrec[merged_idx++] = srec[src_idx++];
- src_size -= record_size;
- }
- }
-
- while (dest_size > 0) {
- mrec[merged_idx++] = drec[dest_idx++];
- dest_size -= record_size;
- }
-
- while (src_size > 0) {
- mrec[merged_idx++] = srec[src_idx++];
- src_size -= record_size;
- }
-
- kfree(*dest_log);
- *dest_log = merged_buf;
- *dest_log_size = total;
-
- return 0;
-}
-
static ssize_t ramoops_pstore_read(struct pstore_record *record)
{
ssize_t size = 0;
@@ -297,7 +245,8 @@ static ssize_t ramoops_pstore_read(struct pstore_record *record)
prz_next->corrected_bytes;
tmp_prz->bad_blocks += prz_next->bad_blocks;
- size = ftrace_log_combine(&tmp_prz->old_log,
+ size = pstore_ftrace_combine_log(
+ &tmp_prz->old_log,
&tmp_prz->old_log_size,
prz_next->old_log,
prz_next->old_log_size);
--
2.20.1
next prev parent reply other threads:[~2020-05-10 20:25 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-10 20:24 [PATCH v7 00/18] pstore: mtd: support crash log to block and mtd device Kees Cook
2020-05-10 20:24 ` [PATCH v7 01/18] pstore/ram: Move dump_oops to end of module_param list Kees Cook
2020-05-10 20:24 ` [PATCH v7 02/18] pstore/platform: Switch pstore_info::name to const Kees Cook
2020-05-10 20:24 ` [PATCH v7 03/18] pstore/platform: Move module params after declarations Kees Cook
2020-05-10 20:24 ` [PATCH v7 04/18] pstore/platform: Use backend name for console registration Kees Cook
2020-05-10 20:24 ` [PATCH v7 05/18] pstore/ram: Refactor ftrace buffer merging Kees Cook
2020-05-10 20:24 ` Kees Cook [this message]
2020-05-10 20:24 ` [PATCH v7 07/18] printk: Introduce kmsg_dump_reason_str() Kees Cook
2020-05-12 8:44 ` Petr Mladek
2020-05-12 19:44 ` Kees Cook
2020-05-13 5:08 ` Sergey Senozhatsky
2020-05-10 20:24 ` [PATCH v7 08/18] pstore/zone: Introduce common layer to manage storage zones Kees Cook
2020-05-11 8:36 ` WeiXiong Liao
2020-05-11 23:02 ` Kees Cook
2020-05-10 20:24 ` [PATCH v7 09/18] pstore/blk: Introduce backend for block devices Kees Cook
2020-05-11 8:36 ` WeiXiong Liao
2020-05-11 23:08 ` Kees Cook
2020-05-11 15:36 ` Randy Dunlap
2020-05-11 23:11 ` Kees Cook
2020-05-10 20:24 ` [PATCH v7 10/18] pstore/zone,blk: Add support for pmsg frontend Kees Cook
2020-05-11 8:36 ` WeiXiong Liao
2020-05-10 20:24 ` [PATCH v7 11/18] pstore/zone,blk: Add console frontend support Kees Cook
2020-05-11 15:38 ` Randy Dunlap
2020-05-11 23:14 ` Kees Cook
2020-05-10 20:24 ` [PATCH v7 12/18] pstore/zone,blk: Add ftrace " Kees Cook
2020-05-11 15:37 ` Randy Dunlap
2020-05-10 20:24 ` [PATCH v7 13/18] Documentation: Add details for pstore/blk Kees Cook
2020-05-10 20:24 ` [PATCH v7 14/18] pstore/zone: Provide way to skip "broken" zone for MTD devices Kees Cook
2020-05-10 20:24 ` [PATCH v7 15/18] pstore/blk: Provide way to query pstore configuration Kees Cook
2020-05-10 20:24 ` [PATCH v7 16/18] pstore/blk: Support non-block storage devices Kees Cook
2020-05-10 20:24 ` [PATCH v7 17/18] mtd: Support kmsg dumper based on pstore/blk Kees Cook
2020-05-11 9:01 ` WeiXiong Liao
2020-05-11 23:16 ` Kees Cook
2020-05-10 20:24 ` [PATCH v7 18/18] pstore/blk: Introduce "best_effort" mode Kees Cook
2020-05-11 10:54 ` [PATCH v7 00/18] pstore: mtd: support crash log to block and mtd device WeiXiong Liao
2020-05-11 23:17 ` Kees Cook
2020-05-11 22:39 ` Kees Cook
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