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authorRahul Lakkireddy <rahul.lakkireddy@chelsio.com>2018-05-02 12:47:17 +0300
committerDavid S. Miller <davem@davemloft.net>2018-05-14 20:46:04 +0300
commit2724273e8fd00b512596a77ee063f49b25f36507 (patch)
treed814285445675db025d5b4f3cf9eaf088466eefd /include/uapi/linux/elf.h
parent289e1f4e9e4a09c73a1c0152bb93855ea351ccda (diff)
downloadlinux-2724273e8fd00b512596a77ee063f49b25f36507.tar.xz
vmcore: add API to collect hardware dump in second kernel
The sequence of actions done by device drivers to append their device specific hardware/firmware logs to /proc/vmcore are as follows: 1. During probe (before hardware is initialized), device drivers register to the vmcore module (via vmcore_add_device_dump()), with callback function, along with buffer size and log name needed for firmware/hardware log collection. 2. vmcore module allocates the buffer with requested size. It adds an Elf note and invokes the device driver's registered callback function. 3. Device driver collects all hardware/firmware logs into the buffer and returns control back to vmcore module. Ensure that the device dump buffer size is always aligned to page size so that it can be mmaped. Also, rename alloc_elfnotes_buf() to vmcore_alloc_buf() to make it more generic and reserve NT_VMCOREDD note type to indicate vmcore device dump. Suggested-by: Eric Biederman <ebiederm@xmission.com>. Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com> Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/uapi/linux/elf.h')
-rw-r--r--include/uapi/linux/elf.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
index e2535d6dcec7..4e12c423b9fe 100644
--- a/include/uapi/linux/elf.h
+++ b/include/uapi/linux/elf.h
@@ -421,6 +421,7 @@ typedef struct elf64_shdr {
#define NT_ARM_SYSTEM_CALL 0x404 /* ARM system call number */
#define NT_ARM_SVE 0x405 /* ARM Scalable Vector Extension registers */
#define NT_ARC_V2 0x600 /* ARCv2 accumulator/extra registers */
+#define NT_VMCOREDD 0x700 /* Vmcore Device Dump Note */
/* Note header in a PT_NOTE section */
typedef struct elf32_note {