BMC/Intel-BMC/linux.git/fs/pstore/ram.c, branch dev

ramoops: make it possible to change mem_type param.

2015-05-21T16:52:29+00:00

If we set ramoops.mem_type=1 in command line, the current code can not change mem_type to 1, because it is assigned to 0 in function ramoops_register_dummy. This patch make it possible to change mem_type parameter in command line. Signed-off-by: Wang Long Acked-by: Tony Lindgren Signed-off-by: Tony Luck

pstore/ram: verify ramoops header before saving record

2015-05-21T16:50:34+00:00

On some devices the persistent memory contains junk after a cold boot, and /dev/pstore/dmesg-ramoops-* are created with random data which is not the result of a kernel crash. This patch adds a ramoops header check and skips any persistent_ram_zone that does not have a valid header. Signed-off-by: Ben Zhang Signed-off-by: Tony Luck

fs/pstore: Optimization function ramoops_init_przs

2015-05-21T16:47:22+00:00

The value of cxt->record_size does not change in the loop, so this patch optimize the assign statement by dropping sz entirely and using cxt->record_size in its place. Signed-off-by: Wang Long Acked-by: Kees Cook Signed-off-by: Tony Luck

pstore: Fix the ramoops module parameters update

2015-03-16T18:14:10+00:00

In the function ramoops_probe, the console_size, pmsg_size, ftrace_size may be update because the value is not the power of two. We should update the module parameter variables as well so they are visible through /sys/module/ramoops/parameters correctly. Signed-off-by: Wang Long Acked-by: Mark Salyzyn Acked-by: Kees Cook Signed-off-by: Tony Luck

pstore: Add pmsg - user-space accessible pstore object

2015-01-17T00:01:10+00:00

A secured user-space accessible pstore object. Writes to /dev/pmsg0 are appended to the buffer, on reboot the persistent contents are available in /sys/fs/pstore/pmsg-ramoops-[ID]. One possible use is syslogd, or other daemon, can write messages, then on reboot provides a means to triage user-space activities leading up to a panic as a companion to the pstore dmesg or console logs. Signed-off-by: Mark Salyzyn Acked-by: Kees Cook Signed-off-by: Tony Luck

pstore: Handle zero-sized prz in series

2015-01-16T23:47:23+00:00

ramoops_pstore_read fails to return the next in a prz series after first zero-sized entry, not venturing to the next non-zero entry. Signed-off-by: Mark Salyzyn Acked-by: Kees Cook Signed-off-by: Tony Luck

pstore: Remove superfluous memory size check

2015-01-16T23:45:46+00:00

All previous checks will fail with error if memory size is not sufficient to register a zone, so this legacy check has become redundant. Signed-off-by: Mark Salyzyn Acked-by: Kees Cook Signed-off-by: Tony Luck

Merge tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

2014-12-15T00:10:09+00:00

Pull driver core update from Greg KH: "Here's the set of driver core patches for 3.19-rc1. They are dominated by the removal of the .owner field in platform drivers. They touch a lot of files, but they are "simple" changes, just removing a line in a structure. Other than that, a few minor driver core and debugfs changes. There are some ath9k patches coming in through this tree that have been acked by the wireless maintainers as they relied on the debugfs changes. Everything has been in linux-next for a while" * tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (324 commits) Revert "ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries" fs: debugfs: add forward declaration for struct device type firmware class: Deletion of an unnecessary check before the function call "vunmap" firmware loader: fix hung task warning dump devcoredump: provide a one-way disable function device: Add dev__once variants ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries ath: use seq_file api for ath9k debugfs files debugfs: add helper function to create device related seq_file drivers/base: cacheinfo: remove noisy error boot message Revert "core: platform: add warning if driver has no owner" drivers: base: support cpu cache information interface to userspace via sysfs drivers: base: add cpu_device_create to support per-cpu devices topology: replace custom attribute macros with standard DEVICE_ATTR* cpumask: factor out show_cpumap into separate helper function driver core: Fix unbalanced device reference in drivers_probe driver core: fix race with userland in device_add() sysfs/kernfs: make read requests on pre-alloc files use the buffer. sysfs/kernfs: allow attributes to request write buffer be pre-allocated. fs: sysfs: return EGBIG on write if offset is larger than file size ...

pstore-ram: Allow optional mapping with pgprot_noncached

2014-12-11T21:38:31+00:00

On some ARMs the memory can be mapped pgprot_noncached() and still be working for atomic operations. As pointed out by Colin Cross , in some cases you do want to use pgprot_noncached() if the SoC supports it to see a debug printk just before a write hanging the system. On ARMs, the atomic operations on strongly ordered memory are implementation defined. So let's provide an optional kernel parameter for configuring pgprot_noncached(), and use pgprot_writecombine() by default. Cc: Arnd Bergmann Cc: Rob Herring Cc: Randy Dunlap Cc: Anton Vorontsov Cc: Colin Cross Cc: Olof Johansson Cc: Russell King Cc: stable@vger.kernel.org Acked-by: Kees Cook Signed-off-by: Tony Lindgren Signed-off-by: Tony Luck

pstore/ram: Strip ramoops header for correct decompression

2014-11-05T17:58:17+00:00

pstore compression/decompression was added during 3.12. The ramoops driver prepends a "====timestamp.timestamp-C|D\n" header to the compressed record before handing it over to pstore driver which doesn't know about the header. In pstore_decompress(), the pstore driver reads the first "==" as a zlib header, so the decompression always fails. For example, this causes the driver to write /dev/pstore/dmesg-ramoops-0.enc.z instead of /dev/pstore/dmesg-ramoops-0. This patch makes the ramoops driver remove the header before pstore decompression. Signed-off-by: Ben Zhang Acked-by: Kees Cook Signed-off-by: Tony Luck