diff options
author | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
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committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/include/linux/cacheinfo.h | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/include/linux/cacheinfo.h')
-rw-r--r-- | kernel/include/linux/cacheinfo.h | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/kernel/include/linux/cacheinfo.h b/kernel/include/linux/cacheinfo.h new file mode 100644 index 000000000..3daf5ed39 --- /dev/null +++ b/kernel/include/linux/cacheinfo.h @@ -0,0 +1,100 @@ +#ifndef _LINUX_CACHEINFO_H +#define _LINUX_CACHEINFO_H + +#include <linux/bitops.h> +#include <linux/cpumask.h> +#include <linux/smp.h> + +struct device_node; +struct attribute; + +enum cache_type { + CACHE_TYPE_NOCACHE = 0, + CACHE_TYPE_INST = BIT(0), + CACHE_TYPE_DATA = BIT(1), + CACHE_TYPE_SEPARATE = CACHE_TYPE_INST | CACHE_TYPE_DATA, + CACHE_TYPE_UNIFIED = BIT(2), +}; + +/** + * struct cacheinfo - represent a cache leaf node + * @type: type of the cache - data, inst or unified + * @level: represents the hierarcy in the multi-level cache + * @coherency_line_size: size of each cache line usually representing + * the minimum amount of data that gets transferred from memory + * @number_of_sets: total number of sets, a set is a collection of cache + * lines sharing the same index + * @ways_of_associativity: number of ways in which a particular memory + * block can be placed in the cache + * @physical_line_partition: number of physical cache lines sharing the + * same cachetag + * @size: Total size of the cache + * @shared_cpu_map: logical cpumask representing all the cpus sharing + * this cache node + * @attributes: bitfield representing various cache attributes + * @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 + * @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 + * cache design + * + * While @of_node, @disable_sysfs and @priv are used for internal book + * keeping, the remaining members form the core properties of the cache + */ +struct cacheinfo { + enum cache_type type; + unsigned int level; + unsigned int coherency_line_size; + unsigned int number_of_sets; + unsigned int ways_of_associativity; + unsigned int physical_line_partition; + unsigned int size; + cpumask_t shared_cpu_map; + unsigned int attributes; +#define CACHE_WRITE_THROUGH BIT(0) +#define CACHE_WRITE_BACK BIT(1) +#define CACHE_WRITE_POLICY_MASK \ + (CACHE_WRITE_THROUGH | CACHE_WRITE_BACK) +#define CACHE_READ_ALLOCATE BIT(2) +#define CACHE_WRITE_ALLOCATE BIT(3) +#define CACHE_ALLOCATE_POLICY_MASK \ + (CACHE_READ_ALLOCATE | CACHE_WRITE_ALLOCATE) + + struct device_node *of_node; + bool disable_sysfs; + void *priv; +}; + +struct cpu_cacheinfo { + struct cacheinfo *info_list; + unsigned int num_levels; + unsigned int num_leaves; +}; + +/* + * Helpers to make sure "func" is executed on the cpu whose cache + * attributes are being detected + */ +#define DEFINE_SMP_CALL_CACHE_FUNCTION(func) \ +static inline void _##func(void *ret) \ +{ \ + int cpu = smp_processor_id(); \ + *(int *)ret = __##func(cpu); \ +} \ + \ +int func(unsigned int cpu) \ +{ \ + int ret; \ + smp_call_function_single(cpu, _##func, &ret, true); \ + return ret; \ +} + +struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu); +int init_cache_level(unsigned int cpu); +int populate_cache_leaves(unsigned int cpu); + +const struct attribute_group *cache_get_priv_group(struct cacheinfo *this_leaf); + +#endif /* _LINUX_CACHEINFO_H */ |