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authorHari Bathini <hbathini@linux.vnet.ibm.com>2017-05-08 15:56:28 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-08 17:15:11 -0700
commit11550dc0a00b793236e8dedcf1f489f4627ddf7e (patch)
tree1e932a85b736ceaf90a062a42178cb86a60e7e47 /arch/powerpc
parent22bd0177bd08677a8888f4d1d8361b0326f9119b (diff)
powerpc/fadump: reuse crashkernel parameter for fadump memory reservation
fadump supports specifying memory to reserve for fadump's crash kernel with fadump_reserve_mem kernel parameter. This parameter currently supports passing a fixed memory size, like fadump_reserve_mem=<size> only. This patch aims to add support for other syntaxes like range-based memory size <range1>:<size1>[,<range2>:<size2>,<range3>:<size3>,...] which allows using the same parameter to boot the kernel with different system RAM sizes. As crashkernel parameter already supports the above mentioned syntaxes, this patch deprecates fadump_reserve_mem parameter and reuses crashkernel parameter instead, to specify memory for fadump's crash kernel memory reservation as well. If any offset is provided in crashkernel parameter, it will be ignored in case of fadump, as fadump reserves memory at end of RAM. Advantages using crashkernel parameter instead of fadump_reserve_mem parameter are one less kernel parameter overall, code reuse and support for multiple syntaxes to specify memory. Suggested-by: Dave Young <dyoung@redhat.com> Link: http://lkml.kernel.org/r/149035346749.6881.911095631212975718.stgit@hbathini.in.ibm.com Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com> Reviewed-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Acked-by: Michael Ellerman <mpe@ellerman.id.au> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Dave Young <dyoung@redhat.com> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/kernel/fadump.c23
1 files changed, 10 insertions, 13 deletions
diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index d2e1476d9870..466569e26278 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -209,14 +209,20 @@ static unsigned long init_fadump_mem_struct(struct fadump_mem_struct *fdm,
*/
static inline unsigned long fadump_calculate_reserve_size(void)
{
- unsigned long size;
+ int ret;
+ unsigned long long base, size;
/*
- * Check if the size is specified through fadump_reserve_mem= cmdline
- * option. If yes, then use that.
+ * Check if the size is specified through crashkernel= cmdline
+ * option. If yes, then use that but ignore base as fadump
+ * reserves memory at end of RAM.
*/
- if (fw_dump.reserve_bootvar)
+ ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
+ &size, &base);
+ if (ret == 0 && size > 0) {
+ fw_dump.reserve_bootvar = (unsigned long)size;
return fw_dump.reserve_bootvar;
+ }
/* divide by 20 to get 5% of value */
size = memblock_end_of_DRAM() / 20;
@@ -371,15 +377,6 @@ static int __init early_fadump_param(char *p)
}
early_param("fadump", early_fadump_param);
-/* Look for fadump_reserve_mem= cmdline option */
-static int __init early_fadump_reserve_mem(char *p)
-{
- if (p)
- fw_dump.reserve_bootvar = memparse(p, &p);
- return 0;
-}
-early_param("fadump_reserve_mem", early_fadump_reserve_mem);
-
static void register_fw_dump(struct fadump_mem_struct *fdm)
{
int rc;