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arm64: Add support for ACPI based firmware tables

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The /sys cache entries should support ACPI/PPTT generated cache
topology information.  For arm64, if ACPI is enabled, determine
the max number of cache levels and populate them using the PPTT
table if one is available.

Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Vijaya Kumar K <vkilari@codeaurora.org>
Tested-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Tested-by: Tomasz Nowicki <Tomasz.Nowicki@cavium.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Jeremy Linton 2018-05-11 18:58:03 -05:00 committed by Catalin Marinas
parent 582b468bdc
commit 8571890e15
1 changed files with 10 additions and 5 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

15
arch/arm64/kernel/cacheinfo.c
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@ -17,6 +17,7 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/acpi.h>
#include <linux/cacheinfo.h>
#include <linux/of.h>
@ -46,7 +47,7 @@ static void ci_leaf_init(struct cacheinfo *this_leaf,
static int __init_cache_level(unsigned int cpu)
{
unsigned int ctype, level, leaves, of_level;
unsigned int ctype, level, leaves, fw_level;
struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
for (level = 1, leaves = 0; level <= MAX_CACHE_LEVEL; level++) {
@ -59,15 +60,19 @@ static int __init_cache_level(unsigned int cpu)
leaves += (ctype == CACHE_TYPE_SEPARATE) ? 2 : 1;
}
of_level = of_find_last_cache_level(cpu);
if (level < of_level) {
if (acpi_disabled)
fw_level = of_find_last_cache_level(cpu);
else
fw_level = acpi_find_last_cache_level(cpu);
if (level < fw_level) {
/*
* some external caches not specified in CLIDR_EL1
* the information may be available in the device tree
* only unified external caches are considered here
*/
leaves += (of_level - level);
level = of_level;
leaves += (fw_level - level);
level = fw_level;
}
this_cpu_ci->num_levels = level;