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powerpc/64: Hard code cache geometry on POWER8 

All shipping firmware versions have it wrong in the device-tree

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Benjamin Herrenschmidt 2017-01-08 17:31:49 -06:00 committed by Michael Ellerman
parent 65e01f386f
commit 608b42140e
1 changed files with 18 additions and 2 deletions
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20
arch/powerpc/kernel/setup_64.c
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@ -472,11 +472,27 @@ static bool __init parse_cache_info(struct device_node *np,
void __init initialize_cache_info(void)
{
struct device_node *cpu, *l2, *l3 = NULL;
struct device_node *cpu = NULL, *l2, *l3 = NULL;
u32 pvr;
DBG(" -> initialize_cache_info()\n");
cpu = of_find_node_by_type(NULL, "cpu");
/*
* All shipping POWER8 machines have a firmware bug that
* puts incorrect information in the device-tree. This will
* be (hopefully) fixed for future chips but for now hard
* code the values if we are running on one of these
*/
pvr = PVR_VER(mfspr(SPRN_PVR));
if (pvr == PVR_POWER8 || pvr == PVR_POWER8E ||
pvr == PVR_POWER8NVL) {
/* size lsize blk sets */
init_cache_info(&ppc64_caches.l1i, 0x8000, 128, 128, 32);
init_cache_info(&ppc64_caches.l1d, 0x10000, 128, 128, 64);
init_cache_info(&ppc64_caches.l2, 0x80000, 128, 0, 512);
init_cache_info(&ppc64_caches.l3, 0x800000, 128, 0, 8192);
} else
cpu = of_find_node_by_type(NULL, "cpu");
/*
* We're assuming *all* of the CPUs have the same