leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

powerpc/64: Retrieve number of L1 cache sets from device-tree

Browse Source 
It will be used to calculate the associativity

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 17:31:46 -06:00 committed by Michael Ellerman
parent bd067f83b0
commit 5d451a87e5
2 changed files with 28 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/include/asm/cache.h
View File

@ -36,11 +36,13 @@ struct ppc64_caches {
u32 dblock_size; /* L1 d-cache block size */
u32 log_dblock_size;
u32 dblocks_per_page;
u32 dsets;
u32 isize; /* L1 i-cache size */
u32 iline_size; /* L1 d-cache line size */
u32 iblock_size; /* L1 i-cache block size */
u32 log_iblock_size;
u32 iblocks_per_page;
u32 isets;
};
extern struct ppc64_caches ppc64_caches;

28
arch/powerpc/kernel/setup_64.c
View File

@ -412,14 +412,18 @@ void __init initialize_cache_info(void)
* d-cache and i-cache sizes... -Peter
*/
if (num_cpus == 1) {
const __be32 *sizep, *lsizep, *bsizep;
u32 size, lsize, bsize;
const __be32 *sizep, *lsizep, *bsizep, *setsp;
u32 size, lsize, bsize, sets;
size = 0;
sets = -1u;
lsize = bsize = cur_cpu_spec->dcache_bsize;
sizep = of_get_property(np, "d-cache-size", NULL);
if (sizep != NULL)
size = be32_to_cpu(*sizep);
setsp = of_get_property(np, "d-cache-sets", NULL);
if (setsp != NULL)
sets = be32_to_cpu(*setsp);
bsizep = of_get_property(np, "d-cache-block-size",
NULL);
lsizep = of_get_property(np, "d-cache-line-size",
@ -435,17 +439,32 @@ void __init initialize_cache_info(void)
"sizep: %p, bsizep: %p, lsizep: %p\n",
sizep, bsizep, lsizep);
/*
* OF is weird .. it represents fully associative caches
* as "1 way" which doesn't make much sense and doesn't
* leave room for direct mapped. We'll assume that 0
* in OF means direct mapped for that reason.
*/
if (sets == 1)
sets = 0;
else if (sets == 0)
sets = 1;
ppc64_caches.dsize = size;
ppc64_caches.dsets = sets;
ppc64_caches.dline_size = lsize;
ppc64_caches.dblock_size = bsize;
ppc64_caches.log_dblock_size = __ilog2(bsize);
ppc64_caches.dblocks_per_page = PAGE_SIZE / bsize;
size = 0;
sets = -1u;
lsize = bsize = cur_cpu_spec->icache_bsize;
sizep = of_get_property(np, "i-cache-size", NULL);
if (sizep != NULL)
size = be32_to_cpu(*sizep);
setsp = of_get_property(np, "i-cache-sets", NULL);
if (setsp != NULL)
sets = be32_to_cpu(*setsp);
bsizep = of_get_property(np, "i-cache-block-size",
NULL);
lsizep = of_get_property(np, "i-cache-line-size",
@ -461,7 +480,12 @@ void __init initialize_cache_info(void)
"sizep: %p, bsizep: %p, lsizep: %p\n",
sizep, bsizep, lsizep);
if (sets == 1)
sets = 0;
else if (sets == 0)
sets = 1;
ppc64_caches.isize = size;
ppc64_caches.isets = sets;
ppc64_caches.iline_size = lsize;
ppc64_caches.iblock_size = bsize;
ppc64_caches.log_iblock_size = __ilog2(bsize);