malhuda/msm-4.14
1
0
Fork 0
mirror of https://github.com/rd-stuffs/msm-4.14.git synced 2025-02-20 11:45:48 +08:00
Code Issues Actions Packages Projects Releases Wiki Activity

powerpc/powernv/memtrace: Let the arch hotunplug code flush cache

Browse Source 
[ Upstream commit 7fd6641de28fe9b5bce0c38d2adee0a72a72619e ]

Don't do this via custom code, instead now that we have support in the
arch hotplug/hotunplug code, rely on those routines to do the right
thing.

The existing flush doesn't work because it uses ppc64_caches.l1d.size
instead of ppc64_caches.l1d.line_size.

Fixes: 9d5171a8f248 ("powerpc/powernv: Enable removal of memory for in memory tracing")
Signed-off-by: Balbir Singh <bsingharora@gmail.com>
Reviewed-by: Rashmica Gupta <rashmica.g@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Balbir Singh 2018-04-06 15:24:24 +10:00 committed by Greg Kroah-Hartman
parent a4fa9189d6
commit b0471926ce
1 changed files with 0 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
arch/powerpc/platforms/powernv/memtrace.c
View File

@ -82,19 +82,6 @@ static const struct file_operations memtrace_fops = {
.open = simple_open, .open = simple_open,
}; };
static void flush_memory_region(u64 base, u64 size)
{
unsigned long line_size = ppc64_caches.l1d.size;
u64 end = base + size;
u64 addr;
base = round_down(base, line_size);
end = round_up(end, line_size);
for (addr = base; addr < end; addr += line_size)
asm volatile("dcbf 0,%0" : "=r" (addr) :: "memory");
}
static int check_memblock_online(struct memory_block *mem, void *arg) static int check_memblock_online(struct memory_block *mem, void *arg)
{ {
if (mem->state != MEM_ONLINE) if (mem->state != MEM_ONLINE)
@ -132,10 +119,6 @@ static bool memtrace_offline_pages(u32 nid, u64 start_pfn, u64 nr_pages)
walk_memory_range(start_pfn, end_pfn, (void *)MEM_OFFLINE, walk_memory_range(start_pfn, end_pfn, (void *)MEM_OFFLINE,
change_memblock_state); change_memblock_state);
/* RCU grace period? */
flush_memory_region((u64)__va(start_pfn << PAGE_SHIFT),
nr_pages << PAGE_SHIFT);
lock_device_hotplug(); lock_device_hotplug();
remove_memory(nid, start_pfn << PAGE_SHIFT, nr_pages << PAGE_SHIFT); remove_memory(nid, start_pfn << PAGE_SHIFT, nr_pages << PAGE_SHIFT);
unlock_device_hotplug(); unlock_device_hotplug();