Commit ef462f3b authored by Justin Chen's avatar Justin Chen Committed by Ralf Baechle
Browse files

MIPS: Add cacheinfo support 



Add cacheinfo support for MIPS architectures.

Use information from the cpuinfo_mips struct to populate the
cacheinfo struct. This allows an architecture agnostic approach,
however this also means if cache information is not properly
populated within the cpuinfo_mips struct, there is nothing
we can do. (I.E. c-r3k.c)

Signed-off-by: default avatarJustin Chen <justin.chen@broadcom.com>
Cc: f.fainelli@gmail.com
Cc: linux-mips@linux-mips.org
Cc: bcm-kernel-feedback-list@broadcom.com
Patchwork: https://patchwork.linux-mips.org/patch/14650/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 0014dea6

arch/mips/kernel/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -7,7 +7,7 @@ extra-y := head.o vmlinux.lds 
obj-y		+= cpu-probe.o branch.o elf.o entry.o genex.o idle.o irq.o \

		   process.o prom.o ptrace.o reset.o setup.o signal.o \

		   syscall.o time.o topology.o traps.o unaligned.o watch.o \

		   vdso.o

		   vdso.o cacheinfo.o



ifdef CONFIG_FUNCTION_TRACER

CFLAGS_REMOVE_ftrace.o = -pg

arch/mips/kernel/cacheinfo.c

0 → 100644
+85 −0
Original line number Diff line number Diff line 
/*

 * MIPS cacheinfo support

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * This program is distributed "as is" WITHOUT ANY WARRANTY of any

 * kind, whether express or implied; without even the implied warranty

 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

#include <linux/cacheinfo.h>



/* Populates leaf and increments to next leaf */

#define populate_cache(cache, leaf, c_level, c_type)		\

	leaf->type = c_type;					\

	leaf->level = c_level;					\

	leaf->coherency_line_size = c->cache.linesz;		\

	leaf->number_of_sets = c->cache.sets;			\

	leaf->ways_of_associativity = c->cache.ways;		\

	leaf->size = c->cache.linesz * c->cache.sets *		\

		c->cache.ways;					\

	leaf++;



static int __init_cache_level(unsigned int cpu)

{

	struct cpuinfo_mips *c = &current_cpu_data;

	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);

	int levels = 0, leaves = 0;



	/*

	 * If Dcache is not set, we assume the cache structures

	 * are not properly initialized.

	 */

	if (c->dcache.waysize)

		levels += 1;

	else

		return -ENOENT;





	leaves += (c->icache.waysize) ? 2 : 1;



	if (c->scache.waysize) {

		levels++;

		leaves++;

	}



	if (c->tcache.waysize) {

		levels++;

		leaves++;

	}



	this_cpu_ci->num_levels = levels;

	this_cpu_ci->num_leaves = leaves;

	return 0;

}



static int __populate_cache_leaves(unsigned int cpu)

{

	struct cpuinfo_mips *c = &current_cpu_data;

	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);

	struct cacheinfo *this_leaf = this_cpu_ci->info_list;



	if (c->icache.waysize) {

		populate_cache(dcache, this_leaf, 1, CACHE_TYPE_DATA);

		populate_cache(icache, this_leaf, 1, CACHE_TYPE_INST);

	} else {

		populate_cache(dcache, this_leaf, 1, CACHE_TYPE_UNIFIED);

	}



	if (c->scache.waysize)

		populate_cache(scache, this_leaf, 2, CACHE_TYPE_UNIFIED);



	if (c->tcache.waysize)

		populate_cache(tcache, this_leaf, 3, CACHE_TYPE_UNIFIED);



	return 0;

}



DEFINE_SMP_CALL_CACHE_FUNCTION(init_cache_level)

DEFINE_SMP_CALL_CACHE_FUNCTION(populate_cache_leaves)

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