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powerpc/64: Add L2 and L3 cache shape info 

Retrieved from device-tree when available

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 17:31:48 -06:00 committed by Michael Ellerman
parent e2827fe5c1
commit 65e01f386f
2 changed files with 23 additions and 5 deletions
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2
arch/powerpc/include/asm/cache.h
View File

@ -43,6 +43,8 @@ struct ppc_cache_info {
struct ppc64_caches {
struct ppc_cache_info l1d;
struct ppc_cache_info l1i;
struct ppc_cache_info l2;
struct ppc_cache_info l3;
};
extern struct ppc64_caches ppc64_caches;

26
arch/powerpc/kernel/setup_64.c
View File

@ -472,22 +472,38 @@ static bool __init parse_cache_info(struct device_node *np,
void __init initialize_cache_info(void)
{
struct device_node *np;
struct device_node *cpu, *l2, *l3 = NULL;
DBG(" -> initialize_cache_info()\n");
np = of_find_node_by_type(NULL, "cpu");
cpu = of_find_node_by_type(NULL, "cpu");
/*
* We're assuming *all* of the CPUs have the same
* d-cache and i-cache sizes... -Peter
*/
if (np) {
if (!parse_cache_info(np, false, &ppc64_caches.l1d))
if (cpu) {
if (!parse_cache_info(cpu, false, &ppc64_caches.l1d))
DBG("Argh, can't find dcache properties !\n");
if (!parse_cache_info(np, true, &ppc64_caches.l1i))
if (!parse_cache_info(cpu, true, &ppc64_caches.l1i))
DBG("Argh, can't find icache properties !\n");
/*
* Try to find the L2 and L3 if any. Assume they are
* unified and use the D-side properties.
*/
l2 = of_find_next_cache_node(cpu);
of_node_put(cpu);
if (l2) {
parse_cache_info(l2, false, &ppc64_caches.l2);
l3 = of_find_next_cache_node(l2);
of_node_put(l2);
}
if (l3) {
parse_cache_info(l3, false, &ppc64_caches.l3);
of_node_put(l3);
}
}
/* For use by binfmt_elf */