diff options
author | Matthew McClintock <msm@freescale.com> | 2010-09-17 02:58:26 +0400 |
---|---|---|
committer | Kumar Gala <galak@kernel.crashing.org> | 2010-10-14 09:52:52 +0400 |
commit | 677de425583b43bf1af3aea0fa8d433120f0f13c (patch) | |
tree | 849973fff204f23518d8b7ccee45a16cf17de214 /arch/powerpc/platforms | |
parent | 5d692961633d4ecd1ca07313b75ddf35520a4c28 (diff) | |
download | linux-677de425583b43bf1af3aea0fa8d433120f0f13c.tar.xz |
powerpc/85xx: flush dcache before resetting cores
When we do an mpic_reset_core we need to make sure the dcache is flushed.
Signed-off-by: Matthew McClintock <msm@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/platforms')
-rw-r--r-- | arch/powerpc/platforms/85xx/smp.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/85xx/smp.c b/arch/powerpc/platforms/85xx/smp.c index c9a77fa62744..5c91a992f02b 100644 --- a/arch/powerpc/platforms/85xx/smp.c +++ b/arch/powerpc/platforms/85xx/smp.c @@ -16,6 +16,7 @@ #include <linux/delay.h> #include <linux/of.h> #include <linux/kexec.h> +#include <linux/highmem.h> #include <asm/machdep.h> #include <asm/pgtable.h> @@ -140,11 +141,60 @@ static void mpc85xx_smp_kexec_down(void *arg) ppc_md.kexec_cpu_down(0,1); } +static void map_and_flush(unsigned long paddr) +{ + struct page *page = pfn_to_page(paddr >> PAGE_SHIFT); + unsigned long kaddr = (unsigned long)kmap(page); + + flush_dcache_range(kaddr, kaddr + PAGE_SIZE); + kunmap(page); +} + +/** + * Before we reset the other cores, we need to flush relevant cache + * out to memory so we don't get anything corrupted, some of these flushes + * are performed out of an overabundance of caution as interrupts are not + * disabled yet and we can switch cores + */ +static void mpc85xx_smp_flush_dcache_kexec(struct kimage *image) +{ + kimage_entry_t *ptr, entry; + unsigned long paddr; + int i; + + if (image->type == KEXEC_TYPE_DEFAULT) { + /* normal kexec images are stored in temporary pages */ + for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE); + ptr = (entry & IND_INDIRECTION) ? + phys_to_virt(entry & PAGE_MASK) : ptr + 1) { + if (!(entry & IND_DESTINATION)) { + map_and_flush(entry); + } + } + /* flush out last IND_DONE page */ + map_and_flush(entry); + } else { + /* crash type kexec images are copied to the crash region */ + for (i = 0; i < image->nr_segments; i++) { + struct kexec_segment *seg = &image->segment[i]; + for (paddr = seg->mem; paddr < seg->mem + seg->memsz; + paddr += PAGE_SIZE) { + map_and_flush(paddr); + } + } + } + + /* also flush the kimage struct to be passed in as well */ + flush_dcache_range((unsigned long)image, + (unsigned long)image + sizeof(*image)); +} + static void mpc85xx_smp_machine_kexec(struct kimage *image) { int timeout = INT_MAX; int i, num_cpus = num_present_cpus(); + mpc85xx_smp_flush_dcache_kexec(image); if (image->type == KEXEC_TYPE_DEFAULT) smp_call_function(mpc85xx_smp_kexec_down, NULL, 0); |