On Thu, Oct 12, 2017 at 02:48:52PM -0500, Jeremy Linton wrote: > The /sys cache entries should support ACPI/PPTT generated cache > topology information. Lets detect ACPI systems and call > an arch specific cache_setup_acpi() routine to update the hardware > probed cache topology. > > For arm64, if ACPI is enabled, determine the max number of cache > levels and populate them using a PPTT table if one is available. > > Signed-off-by: Jeremy Linton <jeremy.linton@xxxxxxx> > --- > arch/arm64/kernel/cacheinfo.c | 23 ++++++++++++++++++----- > drivers/acpi/pptt.c | 1 + > drivers/base/cacheinfo.c | 17 +++++++++++------ > include/linux/cacheinfo.h | 11 +++++++++-- > 4 files changed, 39 insertions(+), 13 deletions(-) > > diff --git a/arch/arm64/kernel/cacheinfo.c b/arch/arm64/kernel/cacheinfo.c > index 380f2e2fbed5..2e2cf0d312ba 100644 > --- a/arch/arm64/kernel/cacheinfo.c > +++ b/arch/arm64/kernel/cacheinfo.c > @@ -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> > > @@ -44,9 +45,17 @@ static void ci_leaf_init(struct cacheinfo *this_leaf, > this_leaf->type = type; > } > > +#ifndef CONFIG_ACPI > +int acpi_find_last_cache_level(unsigned int cpu) > +{ > + /*ACPI kernels should be built with PPTT support*/ > + return 0; > +} > +#endif > + > 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 +68,19 @@ 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; > diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c > index c86715fed4a7..b5c6de37e328 100644 > --- a/drivers/acpi/pptt.c > +++ b/drivers/acpi/pptt.c > @@ -355,6 +355,7 @@ static void update_cache_properties(struct cacheinfo *this_leaf, > struct acpi_pptt_cache *found_cache, > struct acpi_pptt_processor *cpu_node) > { > + this_leaf->firmware_node = cpu_node; This pointer comes from an ACPI static table mapping that happens to be permanent so it should be safe given that the mapping is carried out at device_initcall (ie cache_setup_acpi()) but it is not that obvious. More to it below. > if (found_cache->flags & ACPI_PPTT_SIZE_PROPERTY_VALID) > this_leaf->size = found_cache->size; > if (found_cache->flags & ACPI_PPTT_LINE_SIZE_VALID) > diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c > index eb3af2739537..8eca279e50d1 100644 > --- a/drivers/base/cacheinfo.c > +++ b/drivers/base/cacheinfo.c > @@ -86,7 +86,7 @@ static int cache_setup_of_node(unsigned int cpu) > static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf, > struct cacheinfo *sib_leaf) > { > - return sib_leaf->of_node == this_leaf->of_node; > + return sib_leaf->firmware_node == this_leaf->firmware_node; > } > > /* OF properties to query for a given cache type */ > @@ -215,6 +215,11 @@ static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf, > } > #endif > > +int __weak cache_setup_acpi(unsigned int cpu) > +{ > + return -ENOTSUPP; > +} > + > static int cache_shared_cpu_map_setup(unsigned int cpu) > { > struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu); > @@ -225,11 +230,11 @@ static int cache_shared_cpu_map_setup(unsigned int cpu) > if (this_cpu_ci->cpu_map_populated) > return 0; > > - if (of_have_populated_dt()) > + if (!acpi_disabled) > + ret = cache_setup_acpi(cpu); > + else if (of_have_populated_dt()) > ret = cache_setup_of_node(cpu); > - else if (!acpi_disabled) > - /* No cache property/hierarchy support yet in ACPI */ > - ret = -ENOTSUPP; > + > if (ret) > return ret; > > @@ -286,7 +291,7 @@ static void cache_shared_cpu_map_remove(unsigned int cpu) > > static void cache_override_properties(unsigned int cpu) > { > - if (of_have_populated_dt()) > + if (acpi_disabled && of_have_populated_dt()) > return cache_of_override_properties(cpu); > } > > diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h > index 6a524bf6a06d..d1e9b8e01981 100644 > --- a/include/linux/cacheinfo.h > +++ b/include/linux/cacheinfo.h > @@ -36,6 +36,9 @@ enum cache_type { > * @of_node: if devicetree is used, this represents either the cpu node in > * case there's no explicit cache node or the cache node itself in the > * device tree > + * @firmware_node: Shared with of_node. When not using DT, this may contain > + * pointers to other firmware based values. Particularly ACPI/PPTT > + * unique values. > * @disable_sysfs: indicates whether this node is visible to the user via > * sysfs or not > * @priv: pointer to any private data structure specific to particular > @@ -64,8 +67,10 @@ struct cacheinfo { > #define CACHE_ALLOCATE_POLICY_MASK \ > (CACHE_READ_ALLOCATE | CACHE_WRITE_ALLOCATE) > #define CACHE_ID BIT(4) > - > - struct device_node *of_node; > + union { > + struct device_node *of_node; > + void *firmware_node; > + }; How about turning of_node into a struct fwnode_handle* (and allocate one for each PPTT cache node - acpi_static_fwnode - to have the ACPI counterpart) ? It will make more churn given that that pointer is just used to carry out a pointer comparison but it's also a bit more elegant. Lorenzo > bool disable_sysfs; > void *priv; > }; > @@ -98,6 +103,8 @@ int func(unsigned int cpu) \ > struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu); > int init_cache_level(unsigned int cpu); > int populate_cache_leaves(unsigned int cpu); > +int cache_setup_acpi(unsigned int cpu); > +int acpi_find_last_cache_level(unsigned int cpu); > > const struct attribute_group *cache_get_priv_group(struct cacheinfo *this_leaf); > > -- > 2.13.5 > -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
