fadump: Add PT_NOTE program header for vmcoreinfo

Introduce a PT_NOTE program header that points to physical address of
vmcoreinfo_note buffer declared in kernel/kexec.c. The vmcoreinfo
note buffer is populated during crash_fadump() at the time of system
crash.

Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index da68bdad194a..a83bc9015c64 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -814,6 +814,19 @@ static void fadump_setup_crash_memory_ranges(void)
         }
 }
 
+/*
+ * If the given physical address falls within the boot memory region then
+ * return the relocated address that points to the dump region reserved
+ * for saving initial boot memory contents.
+ */
+static inline unsigned long fadump_relocate(unsigned long paddr)
+{
+        if (paddr > RMA_START && paddr < fw_dump.boot_memory_size)
+                return fdm.rmr_region.destination_address + paddr;
+        else
+                return paddr;
+}
+
 static int fadump_create_elfcore_headers(char *bufp)
 {
         struct elfhdr *elf;
@@ -845,6 +858,22 @@ static int fadump_create_elfcore_headers(char *bufp)
 
         (elf->e_phnum)++;
 
+        /* setup ELF PT_NOTE for vmcoreinfo */
+        phdr = (struct elf_phdr *)bufp;
+        bufp += sizeof(struct elf_phdr);
+        phdr->p_type    = PT_NOTE;
+        phdr->p_flags   = 0;
+        phdr->p_vaddr   = 0;
+        phdr->p_align   = 0;
+
+        phdr->p_paddr   = fadump_relocate(paddr_vmcoreinfo_note());
+        phdr->p_offset  = phdr->p_paddr;
+        phdr->p_memsz   = vmcoreinfo_max_size;
+        phdr->p_filesz  = vmcoreinfo_max_size;
+
+        /* Increment number of program headers. */
+        (elf->e_phnum)++;
+
         /* setup PT_LOAD sections. */
 
         for (i = 0; i < crash_mem_ranges; i++) {