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authorRahul Lakkireddy <rahul.lakkireddy@chelsio.com>2018-05-02 15:17:17 +0530
committerDavid S. Miller <davem@davemloft.net>2018-05-14 13:46:04 -0400
commit2724273e8fd00b512596a77ee063f49b25f36507 (patch)
treed814285445675db025d5b4f3cf9eaf088466eefd /include/linux/kcore.h
parent289e1f4e9e4a09c73a1c0152bb93855ea351ccda (diff)
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/linux/kcore.h')
-rw-r--r--include/linux/kcore.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/kcore.h b/include/linux/kcore.h
index 80db19d3a505..8de55e4b5ee9 100644
--- a/include/linux/kcore.h
+++ b/include/linux/kcore.h
@@ -28,6 +28,12 @@ struct vmcore {
loff_t offset;
};
+struct vmcoredd_node {
+ struct list_head list; /* List of dumps */
+ void *buf; /* Buffer containing device's dump */
+ unsigned int size; /* Size of the buffer */
+};
+
#ifdef CONFIG_PROC_KCORE
extern void kclist_add(struct kcore_list *, void *, size_t, int type);
#else