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/Linux-v5.15/Documentation/admin-guide/
Dpstore-blk.rst3 pstore block oops/panic logger
9 pstore block (pstore/blk) is an oops/panic logger that writes its logs to a
11 these log files by mounting pstore filesystem like::
13 mount -t pstore pstore /sys/fs/pstore
16 pstore block concepts
19 pstore/blk provides efficient configuration method for pstore/blk, which
23 Configurations for user determine how pstore/blk works, such as pmsg_size,
46 It's required for pstore/blk. It is also used for MTD device.
48 When pstore/blk is built as a module, "blkdev" accepts the following variants:
56 When pstore/blk is built into the kernel, "blkdev" accepts the following variants:
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Dramoops.rst27 Typically the default value of ``mem_type=0`` should be used as that sets the pstore
29 ``pgprot_noncached``, which only works on some platforms. This is because pstore
138 The dump data can be read from the pstore filesystem. The format for these
140 a stored record from RAM, simply unlink the respective pstore file.
150 # echo 1 > /sys/kernel/debug/pstore/record_ftrace
153 # mount -t pstore pstore /mnt/
Dindex.rst47 pstore-blk
Dkernel-parameters.txt4263 pstore.backend= Specify the name of the pstore backend to use
/Linux-v5.15/drivers/md/
Ddm-snap-persistent.c102 struct pstore { struct
167 static int alloc_area(struct pstore *ps) in alloc_area() argument
202 static void free_area(struct pstore *ps) in free_area()
229 static int chunk_io(struct pstore *ps, void *area, chunk_t chunk, int op, in chunk_io()
268 static chunk_t area_location(struct pstore *ps, chunk_t area) in area_location()
273 static void skip_metadata(struct pstore *ps) in skip_metadata()
285 static int area_io(struct pstore *ps, int op, int op_flags) in area_io()
292 static void zero_memory_area(struct pstore *ps) in zero_memory_area()
297 static int zero_disk_area(struct pstore *ps, chunk_t area) in zero_disk_area()
303 static int read_header(struct pstore *ps, int *new_snapshot) in read_header()
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/Linux-v5.15/fs/pstore/
DKconfig8 persistent storage via "pstore" filesystem that can
9 be mounted as /dev/pstore. Only useful if you have
10 a platform level driver that registers with pstore to
22 Defines default size of pstore kernel log storage.
77 prompt "Default pstore compression algorithm"
81 This change be changed at boot with "pstore.compress=..." on
84 Currently, pstore has support for 6 compression algorithms:
123 When the option is enabled, pstore will log all kernel
130 When the option is enabled, pstore will export a character
132 data can be retrieved from /sys/fs/pstore/pmsg-ramoops-[ID].
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DMakefile6 obj-$(CONFIG_PSTORE) += pstore.o
8 pstore-objs += inode.o platform.o
9 pstore-$(CONFIG_PSTORE_FTRACE) += ftrace.o
11 pstore-$(CONFIG_PSTORE_PMSG) += pmsg.o
Dram.c100 struct pstore_info pstore; member
439 .pstore = {
798 cxt->pstore.data = cxt; in ramoops_probe()
805 cxt->pstore.flags = 0; in ramoops_probe()
807 cxt->pstore.flags |= PSTORE_FLAGS_DMESG; in ramoops_probe()
808 cxt->pstore.max_reason = pdata->max_reason; in ramoops_probe()
811 cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE; in ramoops_probe()
813 cxt->pstore.flags |= PSTORE_FLAGS_FTRACE; in ramoops_probe()
815 cxt->pstore.flags |= PSTORE_FLAGS_PMSG; in ramoops_probe()
822 if (cxt->pstore.flags & PSTORE_FLAGS_DMESG) { in ramoops_probe()
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Dzone.c138 struct pstore_info pstore; member
1102 .pstore = {
1369 cxt->pstore.bufsize = cxt->kpszs[0]->buffer_size - in register_pstore_zone()
1371 cxt->pstore.buf = kzalloc(cxt->pstore.bufsize, GFP_KERNEL); in register_pstore_zone()
1372 if (!cxt->pstore.buf) { in register_pstore_zone()
1377 cxt->pstore.data = cxt; in register_pstore_zone()
1380 cxt->pstore.max_reason = info->max_reason; in register_pstore_zone()
1381 cxt->pstore.name = info->name; in register_pstore_zone()
1383 cxt->pstore.flags |= PSTORE_FLAGS_DMESG; in register_pstore_zone()
1385 kmsg_dump_reason_str(cxt->pstore.max_reason)); in register_pstore_zone()
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/Linux-v5.15/Documentation/ABI/testing/
Dpstore1 What: /sys/fs/pstore/... (or /dev/pstore/...)
14 # mount -t pstore -o kmsg_bytes=8000 - /sys/fs/pstore
16 $ ls -l /sys/fs/pstore/
30 $ rm /sys/fs/pstore/dmesg-erst-1
32 The expectation is that all files in /sys/fs/pstore/
45 set by passing the pstore.backend= argument to the kernel at
/Linux-v5.15/tools/testing/selftests/pstore/
Dpstore_post_reboot_tests23 mount_info=`grep pstore /proc/mounts`
28 mount none /sys/fs/pstore -t pstore
30 mount_point=`grep pstore /proc/mounts | cut -d' ' -f2 | head -n1`
Dcommon_tests77 backend=`cat /sys/module/pstore/parameters/backend`
/Linux-v5.15/tools/testing/selftests/
DMakefile51 TARGETS += pstore
196 $(MAKE) -C pstore run_crash
/Linux-v5.15/drivers/firmware/efi/
DKconfig23 tristate "Register efivars backend for pstore"
27 Say Y here to enable use efivars as a backend to pstore. This
29 else supported by pstore to EFI variables.
32 bool "Disable using efivars as a pstore backend by default"
37 backend for pstore by default. This setting can be overridden
DMakefile22 obj-$(CONFIG_EFI_VARS_PSTORE) += efi-pstore.o
/Linux-v5.15/Documentation/devicetree/bindings/reserved-memory/
Dramoops.txt6 is named "ramoops" after the backend, rather than "pstore" which is the
/Linux-v5.15/fs/
DMakefile136 obj-$(CONFIG_PSTORE) += pstore/
DKconfig310 source "fs/pstore/Kconfig"
/Linux-v5.15/drivers/mtd/
DKconfig177 tristate "Log panic/oops to an MTD buffer based on pstore"
182 mounting pstore filesystem.
/Linux-v5.15/drivers/platform/chrome/
DKconfig29 tristate "Chrome OS pstore support"
/Linux-v5.15/arch/arm64/boot/dts/hisilicon/
Dhi6220-hikey.dts36 * 0x21f0,0000 - 0x21ff,ffff: pstore/ramoops buffer
/Linux-v5.15/kernel/power/
DKconfig215 captured in pstore device for inspection in subsequent
/Linux-v5.15/
DMAINTAINERS15164 T: git git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/pstore
15166 F: Documentation/admin-guide/pstore-blk.rst
15169 F: drivers/firmware/efi/efi-pstore.c
15170 F: fs/pstore/
15171 F: include/linux/pstore*
15172 K: \b(pstore|ramoops)