[PATCH 1/3] pstore/zone: Remove redundant check for total size

[PATCH 1/3] pstore/zone: Remove redundant check for total size

[Zhenguo Zhao]

From: Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com>

The macro check_size contains 4096 size check for total size.

check_size(total_size, 4096)

Signed-off-by: Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com>
---
 fs/pstore/zone.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/fs/pstore/zone.c b/fs/pstore/zone.c
index 7c8f8fe..93a770c 100644
--- a/fs/pstore/zone.c
+++ b/fs/pstore/zone.c
@@ -1295,10 +1295,6 @@ int register_pstore_zone(struct pstore_zone_info *info)
 	int err = -EINVAL;
 	struct psz_context *cxt = &pstore_zone_cxt;
 
-	if (info->total_size < 4096) {
-		pr_warn("total_size must be >= 4096\n");
-		return -EINVAL;
-	}
 	if (info->total_size > SZ_128M) {
 		pr_warn("capping size to 128MiB\n");
 		info->total_size = SZ_128M;
-- 
1.9.1

[PATCH 2/3] pstore: Add pstore back-end choice method in kconfig

[Zhenguo Zhao]

From: Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com>

The pstore has one storage device for back-end,so it should be
use choice method to config.

When ramoops config,insmod pstore_blk.ko,it will print unexpected,the
module will insmod failed.

    if (backend && strcmp(backend, psi->name)) {
        pr_warn("ignoring unexpected backend '%s'\n", psi->name);
        return -EPERM;
    }

Signed-off-by: Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com>
---
 fs/pstore/Kconfig | 57 ++++++++++++++++++++++++++++++-------------------------
 1 file changed, 31 insertions(+), 26 deletions(-)

diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig
index 8adabde..288ed3c 100644
--- a/fs/pstore/Kconfig
+++ b/fs/pstore/Kconfig
@@ -146,21 +146,40 @@ config PSTORE_FTRACE
 
 	  If unsure, say N.
 
-config PSTORE_RAM
-	tristate "Log panic/oops to a RAM buffer"
+choice
+	prompt "Choice pstore device"
 	depends on PSTORE
-	depends on HAS_IOMEM
-	select REED_SOLOMON
-	select REED_SOLOMON_ENC8
-	select REED_SOLOMON_DEC8
+	default PSTORE_RAM
 	help
-	  This enables panic and oops messages to be logged to a circular
-	  buffer in RAM where it can be read back at some later point.
-
-	  Note that for historical reasons, the module will be named
-	  "ramoops.ko".
+	  This option chooses ram or blk to use pstore device.
+	config PSTORE_RAM
+		tristate "Log panic/oops to a RAM buffer"
+		depends on HAS_IOMEM
+		select REED_SOLOMON
+		select REED_SOLOMON_ENC8
+		select REED_SOLOMON_DEC8
+		help
+		  This enables panic and oops messages to be logged to a circular
+		  buffer in RAM where it can be read back at some later point.
+
+		  Note that for historical reasons, the module will be named
+		  "ramoops.ko".
+
+		  For more information, see Documentation/admin-guide/ramoops.rst.
+
+	config PSTORE_BLK
+		tristate "Log panic/oops to a block device"
+		depends on BLOCK
+		select PSTORE_ZONE
+		help
+		  This enables panic and oops message to be logged to a block dev
+		  where it can be read back at some later point.
+
+		  For more information, see Documentation/admin-guide/pstore-blk.rst
+
+		  If unsure, say N.
 
-	  For more information, see Documentation/admin-guide/ramoops.rst.
+endchoice
 
 config PSTORE_ZONE
 	tristate
@@ -169,20 +188,6 @@ config PSTORE_ZONE
 	  The common layer for pstore/blk (and pstore/ram in the future)
 	  to manage storage in zones.
 
-config PSTORE_BLK
-	tristate "Log panic/oops to a block device"
-	depends on PSTORE
-	depends on BLOCK
-	select PSTORE_ZONE
-	default n
-	help
-	  This enables panic and oops message to be logged to a block dev
-	  where it can be read back at some later point.
-
-	  For more information, see Documentation/admin-guide/pstore-blk.rst
-
-	  If unsure, say N.
-
 config PSTORE_BLK_BLKDEV
 	string "block device identifier"
 	depends on PSTORE_BLK
-- 
1.9.1

[PATCH 3/3] pstore: Modify kconfig to align text

[Zhenguo Zhao]

From: Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com>

Modify kconfig help for text consistency

Signed-off-by: Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com>
---
 fs/pstore/Kconfig | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig
index 288ed3c..008ce38 100644
--- a/fs/pstore/Kconfig
+++ b/fs/pstore/Kconfig
@@ -4,15 +4,15 @@ config PSTORE
 	select CRYPTO if PSTORE_COMPRESS
 	default n
 	help
-	   This option enables generic access to platform level
-	   persistent storage via "pstore" filesystem that can
-	   be mounted as /dev/pstore.  Only useful if you have
-	   a platform level driver that registers with pstore to
-	   provide the data, so you probably should just go say "Y"
-	   (or "M") to a platform specific persistent store driver
-	   (e.g. ACPI_APEI on X86) which will select this for you.
-	   If you don't have a platform persistent store driver,
-	   say N.
+	  This option enables generic access to platform level
+	  persistent storage via "pstore" filesystem that can
+	  be mounted as /dev/pstore.  Only useful if you have
+	  a platform level driver that registers with pstore to
+	  provide the data, so you probably should just go say "Y"
+	  (or "M") to a platform specific persistent store driver
+	  (e.g. ACPI_APEI on X86) which will select this for you.
+	  If you don't have a platform persistent store driver,
+	  say N.
 
 config PSTORE_DEFAULT_KMSG_BYTES
 	int "Default kernel log storage space" if EXPERT
-- 
1.9.1

Re: [PATCH 2/3] pstore: Add pstore back-end choice method in kconfig

[赵振国]

Dear Kees Cook,

Thank you very much for your reply.

I had tested Kconfig,

1: "Persistent store support"  set Y, it will build in kernel ,pstore
device select one device only,default is ram.it can be select block
device
   because only one device as backend,so select choice ,it should be reasonable。

2: "Persistent store support"  set m. it will build modules,we can
select one or all pstore devices.

-----------------------------------test result as follows:
1.1:  build in

<*>   Persistent store support            // select build in
<*>     DEFLATE (ZLIB) compression
< >     LZO compression
< >     LZ4 compression
< >     LZ4HC compression
[ ]     842 compression
[ ]     zstd compression
  Default pstore compression algorithm (deflate)  --->
 [*]     Log kernel console messages
[*]     Log user space messages
<*>     Choice pstore device (Log panic/oops to a RAM buffer)  --->
// default select ram.you can select block device
[
(X) Log panic/oops to a RAM buffer)
( ) Log panic/oops to a block device
]

defconfig:

CONFIG_PSTORE=y
CONFIG_PSTORE_DEFLATE_COMPRESS=y
# CONFIG_PSTORE_LZO_COMPRESS is not set
# CONFIG_PSTORE_LZ4_COMPRESS is not set
# CONFIG_PSTORE_LZ4HC_COMPRESS is not set
# CONFIG_PSTORE_842_COMPRESS is not set
# CONFIG_PSTORE_ZSTD_COMPRESS is not set
CONFIG_PSTORE_COMPRESS=y
CONFIG_PSTORE_DEFLATE_COMPRESS_DEFAULT=y
CONFIG_PSTORE_COMPRESS_DEFAULT="deflate"
CONFIG_PSTORE_CONSOLE=y
CONFIG_PSTORE_PMSG=y
CONFIG_PSTORE_RAM=y
# CONFIG_PSTORE_BLK is not set


2.1  select "Persistent store support" is M, default pstore is ram.

<M>   Persistent store support
<M>     DEFLATE (ZLIB) compression
< >     LZO compression
< >     LZ4 compression
< >     LZ4HC compression
[ ]     842 compression
[ ]     zstd compression
 Default pstore compression algorithm (deflate)  --->
[*]     Log kernel console messages
[*]     Log user space messages
Choice pstore device
<M> Log panic/oops to a RAM buffer              // ram device
< > Log panic/oops to a block device

2.2  select "Persistent store support" is M, select block device

<M>   Persistent store support
<M>     DEFLATE (ZLIB) compression
< >     LZO compression
< >     LZ4 compression
< >     LZ4HC compression
[ ]     842 compression
[ ]     zstd compression
 Default pstore compression algorithm (deflate)  --->
[*]     Log kernel console messages
[*]     Log user space messages
Choice pstore device
< > Log panic/oops to a RAM buffer
<M> Log panic/oops to a block device
()    block device identifier (NEW)
(64)  Size in Kbytes of kmsg dump log to store (NEW)
(2)   Maximum kmsg dump reason to store (NEW)
(64)  Size in Kbytes of pmsg to store (NEW)
(64)  Size in Kbytes of console log to store (NEW)

2.3  select "Persistent store support" is M, it can select all pstore device

<M>   Persistent store support
<M>     DEFLATE (ZLIB) compression
< >     LZO compression
< >     LZ4 compression
< >     LZ4HC compression
[ ]     842 compression
[ ]     zstd compression
 Default pstore compression algorithm (deflate)  --->
[*]     Log kernel console messages
[*]     Log user space messages
Choice pstore device
<M> Log panic/oops to a RAM buffer            // ram set M
<M> Log panic/oops to a block device          // block set M
()    block device identifier (NEW)
(64)  Size in Kbytes of kmsg dump log to store (NEW)
(2)   Maximum kmsg dump reason to store (NEW)
(64)  Size in Kbytes of pmsg to store (NEW)
(64)  Size in Kbytes of console log to store (NEW)

defconfig

-CONFIG_PSTORE=y
-CONFIG_PSTORE_DEFLATE_COMPRESS=y
+CONFIG_PSTORE=m
+CONFIG_PSTORE_DEFLATE_COMPRESS=m
 # CONFIG_PSTORE_LZO_COMPRESS is not set
 # CONFIG_PSTORE_LZ4_COMPRESS is not set
 # CONFIG_PSTORE_LZ4HC_COMPRESS is not set
@@ -5536,8 +5536,14 @@ CONFIG_PSTORE_DEFLATE_COMPRESS_DEFAULT=y
 CONFIG_PSTORE_COMPRESS_DEFAULT="deflate"
 CONFIG_PSTORE_CONSOLE=y
 CONFIG_PSTORE_PMSG=y
-CONFIG_PSTORE_RAM=y
-# CONFIG_PSTORE_BLK is not set
+CONFIG_PSTORE_RAM=m
+CONFIG_PSTORE_BLK=m
+CONFIG_PSTORE_ZONE=m
+CONFIG_PSTORE_BLK_BLKDEV=""
+CONFIG_PSTORE_BLK_KMSG_SIZE=64
+CONFIG_PSTORE_BLK_MAX_REASON=2
+CONFIG_PSTORE_BLK_PMSG_SIZE=64
+CONFIG_PSTORE_BLK_CONSOLE_SIZE=64

Thanks!
振国

Re: [PATCH 2/3] pstore: Add pstore back-end choice method in kconfig

[Kees Cook]

On October 28, 2021 11:51:19 PM PDT, Zhenguo Zhao <zhenguo6858@gmail.com> wrote:
>From: Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com>
>
>The pstore has one storage device for back-end,so it should be
>use choice method to config.
>
>When ramoops config,insmod pstore_blk.ko,it will print unexpected,the
>module will insmod failed.
>
>    if (backend && strcmp(backend, psi->name)) {
>        pr_warn("ignoring unexpected backend '%s'\n", psi->name);
>        return -EPERM;
>    }

This is by design: all the backends can be built as modules, and each can be loaded and unloaded as desired. If it's a "choice" only one can be built at a time.

-Kees


>
>Signed-off-by: Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com>
>---
> fs/pstore/Kconfig | 57 ++++++++++++++++++++++++++++++-------------------------
> 1 file changed, 31 insertions(+), 26 deletions(-)
>
>diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig
>index 8adabde..288ed3c 100644
>--- a/fs/pstore/Kconfig
>+++ b/fs/pstore/Kconfig
>@@ -146,21 +146,40 @@ config PSTORE_FTRACE
> 
> 	  If unsure, say N.
> 
>-config PSTORE_RAM
>-	tristate "Log panic/oops to a RAM buffer"
>+choice
>+	prompt "Choice pstore device"
> 	depends on PSTORE
>-	depends on HAS_IOMEM
>-	select REED_SOLOMON
>-	select REED_SOLOMON_ENC8
>-	select REED_SOLOMON_DEC8
>+	default PSTORE_RAM
> 	help
>-	  This enables panic and oops messages to be logged to a circular
>-	  buffer in RAM where it can be read back at some later point.
>-
>-	  Note that for historical reasons, the module will be named
>-	  "ramoops.ko".
>+	  This option chooses ram or blk to use pstore device.
>+	config PSTORE_RAM
>+		tristate "Log panic/oops to a RAM buffer"
>+		depends on HAS_IOMEM
>+		select REED_SOLOMON
>+		select REED_SOLOMON_ENC8
>+		select REED_SOLOMON_DEC8
>+		help
>+		  This enables panic and oops messages to be logged to a circular
>+		  buffer in RAM where it can be read back at some later point.
>+
>+		  Note that for historical reasons, the module will be named
>+		  "ramoops.ko".
>+
>+		  For more information, see Documentation/admin-guide/ramoops.rst.
>+
>+	config PSTORE_BLK
>+		tristate "Log panic/oops to a block device"
>+		depends on BLOCK
>+		select PSTORE_ZONE
>+		help
>+		  This enables panic and oops message to be logged to a block dev
>+		  where it can be read back at some later point.
>+
>+		  For more information, see Documentation/admin-guide/pstore-blk.rst
>+
>+		  If unsure, say N.
> 
>-	  For more information, see Documentation/admin-guide/ramoops.rst.
>+endchoice
> 
> config PSTORE_ZONE
> 	tristate
>@@ -169,20 +188,6 @@ config PSTORE_ZONE
> 	  The common layer for pstore/blk (and pstore/ram in the future)
> 	  to manage storage in zones.
> 
>-config PSTORE_BLK
>-	tristate "Log panic/oops to a block device"
>-	depends on PSTORE
>-	depends on BLOCK
>-	select PSTORE_ZONE
>-	default n
>-	help
>-	  This enables panic and oops message to be logged to a block dev
>-	  where it can be read back at some later point.
>-
>-	  For more information, see Documentation/admin-guide/pstore-blk.rst
>-
>-	  If unsure, say N.
>-
> config PSTORE_BLK_BLKDEV
> 	string "block device identifier"
> 	depends on PSTORE_BLK

-- 
Kees Cook

[PATCH 2/3] pstore: Add pstore back-end choice method in kconfig

[Zhenguo Zhao]

From: Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com>

The pstore has one storage device for back-end,so it should be
use choice method to config.

When ramoops config,insmod pstore_blk.ko,it will print unexpected,the
module will insmod failed.

    if (backend && strcmp(backend, psi->name)) {
        pr_warn("ignoring unexpected backend '%s'\n", psi->name);
        return -EPERM;
    }

Signed-off-by: Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com>
---
 fs/pstore/Kconfig | 57 ++++++++++++++++++++++++++++++-------------------------
 1 file changed, 31 insertions(+), 26 deletions(-)

diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig
index 8adabde..288ed3c 100644
--- a/fs/pstore/Kconfig
+++ b/fs/pstore/Kconfig
@@ -146,21 +146,40 @@ config PSTORE_FTRACE
 
 	  If unsure, say N.
 
-config PSTORE_RAM
-	tristate "Log panic/oops to a RAM buffer"
+choice
+	prompt "Choice pstore device"
 	depends on PSTORE
-	depends on HAS_IOMEM
-	select REED_SOLOMON
-	select REED_SOLOMON_ENC8
-	select REED_SOLOMON_DEC8
+	default PSTORE_RAM
 	help
-	  This enables panic and oops messages to be logged to a circular
-	  buffer in RAM where it can be read back at some later point.
-
-	  Note that for historical reasons, the module will be named
-	  "ramoops.ko".
+	  This option chooses ram or blk to use pstore device.
+	config PSTORE_RAM
+		tristate "Log panic/oops to a RAM buffer"
+		depends on HAS_IOMEM
+		select REED_SOLOMON
+		select REED_SOLOMON_ENC8
+		select REED_SOLOMON_DEC8
+		help
+		  This enables panic and oops messages to be logged to a circular
+		  buffer in RAM where it can be read back at some later point.
+
+		  Note that for historical reasons, the module will be named
+		  "ramoops.ko".
+
+		  For more information, see Documentation/admin-guide/ramoops.rst.
+
+	config PSTORE_BLK
+		tristate "Log panic/oops to a block device"
+		depends on BLOCK
+		select PSTORE_ZONE
+		help
+		  This enables panic and oops message to be logged to a block dev
+		  where it can be read back at some later point.
+
+		  For more information, see Documentation/admin-guide/pstore-blk.rst
+
+		  If unsure, say N.
 
-	  For more information, see Documentation/admin-guide/ramoops.rst.
+endchoice
 
 config PSTORE_ZONE
 	tristate
@@ -169,20 +188,6 @@ config PSTORE_ZONE
 	  The common layer for pstore/blk (and pstore/ram in the future)
 	  to manage storage in zones.
 
-config PSTORE_BLK
-	tristate "Log panic/oops to a block device"
-	depends on PSTORE
-	depends on BLOCK
-	select PSTORE_ZONE
-	default n
-	help
-	  This enables panic and oops message to be logged to a block dev
-	  where it can be read back at some later point.
-
-	  For more information, see Documentation/admin-guide/pstore-blk.rst
-
-	  If unsure, say N.
-
 config PSTORE_BLK_BLKDEV
 	string "block device identifier"
 	depends on PSTORE_BLK
-- 
1.9.1

[PATCH 2/3] pstore: Add pstore back-end choice method in kconfig

[Zhenguo Zhao]

From: Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com>

The pstore has one storage device for back-end,so it should be
use choice method to config.

When ramoops config,insmod pstore_blk.ko,it will print unexpected,the
module will insmod failed.

    if (backend && strcmp(backend, psi->name)) {
        pr_warn("ignoring unexpected backend '%s'\n", psi->name);
        return -EPERM;
    }

Signed-off-by: Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com>
---
 fs/pstore/Kconfig | 57 ++++++++++++++++++++++++++++++-------------------------
 1 file changed, 31 insertions(+), 26 deletions(-)

diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig
index 8adabde..288ed3c 100644
--- a/fs/pstore/Kconfig
+++ b/fs/pstore/Kconfig
@@ -146,21 +146,40 @@ config PSTORE_FTRACE
 
 	  If unsure, say N.
 
-config PSTORE_RAM
-	tristate "Log panic/oops to a RAM buffer"
+choice
+	prompt "Choice pstore device"
 	depends on PSTORE
-	depends on HAS_IOMEM
-	select REED_SOLOMON
-	select REED_SOLOMON_ENC8
-	select REED_SOLOMON_DEC8
+	default PSTORE_RAM
 	help
-	  This enables panic and oops messages to be logged to a circular
-	  buffer in RAM where it can be read back at some later point.
-
-	  Note that for historical reasons, the module will be named
-	  "ramoops.ko".
+	  This option chooses ram or blk to use pstore device.
+	config PSTORE_RAM
+		tristate "Log panic/oops to a RAM buffer"
+		depends on HAS_IOMEM
+		select REED_SOLOMON
+		select REED_SOLOMON_ENC8
+		select REED_SOLOMON_DEC8
+		help
+		  This enables panic and oops messages to be logged to a circular
+		  buffer in RAM where it can be read back at some later point.
+
+		  Note that for historical reasons, the module will be named
+		  "ramoops.ko".
+
+		  For more information, see Documentation/admin-guide/ramoops.rst.
+
+	config PSTORE_BLK
+		tristate "Log panic/oops to a block device"
+		depends on BLOCK
+		select PSTORE_ZONE
+		help
+		  This enables panic and oops message to be logged to a block dev
+		  where it can be read back at some later point.
+
+		  For more information, see Documentation/admin-guide/pstore-blk.rst
+
+		  If unsure, say N.
 
-	  For more information, see Documentation/admin-guide/ramoops.rst.
+endchoice
 
 config PSTORE_ZONE
 	tristate
@@ -169,20 +188,6 @@ config PSTORE_ZONE
 	  The common layer for pstore/blk (and pstore/ram in the future)
 	  to manage storage in zones.
 
-config PSTORE_BLK
-	tristate "Log panic/oops to a block device"
-	depends on PSTORE
-	depends on BLOCK
-	select PSTORE_ZONE
-	default n
-	help
-	  This enables panic and oops message to be logged to a block dev
-	  where it can be read back at some later point.
-
-	  For more information, see Documentation/admin-guide/pstore-blk.rst
-
-	  If unsure, say N.
-
 config PSTORE_BLK_BLKDEV
 	string "block device identifier"
 	depends on PSTORE_BLK
-- 
1.9.1