Linux kernel stable tree (mirror) https://git.radix-linux.su/kernel/linux.git/atom?h=linux-4.20.y 2017-05-18T14:59:06+00:00 2017-05-18T14:59:06+00:00 Julius Werner jwerner@chromium.org 2017-05-02T22:16:29+00:00 urn:sha1:7918cfc46cfad784b2aafdbbc690a96af0ae78d0 This patch redesigns the interface between the generic memconsole driver and its implementations to become more flexible than a flat memory buffer with unchanging bounds. This allows memconsoles like coreboot's to include lines that were added by runtime firmware after the driver was initialized. Since the console log size is thus no longer static, this means that the /sys/firmware/log file has to become unseekable. Signed-off-by: Julius Werner <jwerner@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 2017-04-08T16:05:36+00:00 Thierry Escande thierry.escande@collabora.com 2017-03-28T16:11:26+00:00 urn:sha1:afe9dba4f9aedae417243a1782d085ff23e97b77 This patch splits memconsole.c in 2 parts. One containing the architecture-independent part and the other one containing the EBDA specific part. This prepares the integration of coreboot support for the memconsole. The memconsole driver is now named as memconsole-x86-legacy. Signed-off-by: Thierry Escande <thierry.escande@collabora.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 2014-02-15T19:30:28+00:00 Michel Lespinasse walken@google.com 2014-01-28T13:06:22+00:00 urn:sha1:cb88759107292b4bf36d13c73129add580d4e26e The google memconsole driver is currently broken upstream, as it tries to read memory that is described as reserved in /proc/iomem, by dereferencing a pointer obtained through phys_to_virt(). This triggers a kernel fault as such regions are unmapped after early boot. The proper workaround is to use ioremap_cache() / iounmap() around such accesses. As some unrelated changes, I also converted some printks to use pr_info() and added some missing __init annotations. Tested: booted dbg build, verified I could read /sys/firmware/log Signed-off-by: Michel Lespinasse <walken@google.com> Acked-by: Mike Waychison <mikew@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 2011-04-30T01:09:34+00:00 Mike Waychison mikew@google.com 2011-04-30T00:39:25+00:00 urn:sha1:e561bc45920aade3f8a5aad9058a00e750af1345 This patch introduces the 'memconsole' driver. Our firmware gives us access to an in-memory log of the firmware's output. This gives us visibility in a data-center of headless machines as to what the firmware is doing. The memory console is found by the driver by finding a header block in the EBDA. The buffer is then copied out, and is exported to userland in the file /sys/firmware/log. Signed-off-by: San Mehat <san@google.com> Signed-off-by: Mike Waychison <mikew@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>