/* * cacheinfo support - processor cache information via sysfs * * Based on arch/x86/kernel/cpu/intel_cacheinfo.c * Author: Sudeep Holla <sudeep.holla@arm.com> * * 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/bitops.h>#include <linux/cacheinfo.h>#include <linux/compiler.h>#include <linux/cpu.h>#include <linux/device.h>#include <linux/init.h>#include <linux/of.h>#include <linux/sched.h>#include <linux/slab.h>#include <linux/smp.h>#include <linux/sysfs.h> /* pointer to per cpu cacheinfo */static DEFINE_PER_CPU(struct cpu_cacheinfo, ci_cpu_cacheinfo);#define ci_cacheinfo(cpu)	(&per_cpu(ci_cpu_cacheinfo, cpu))#define cache_leaves(cpu)	(ci_cacheinfo(cpu)->num_leaves)#define per_cpu_cacheinfo(cpu)	(ci_cacheinfo(cpu)->info_list) struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu){	return ci_cacheinfo(cpu);} #ifdef CONFIG_OFstatic int cache_setup_of_node(unsigned int cpu){	struct device_node *np;	struct cacheinfo *this_leaf;	struct device *cpu_dev = get_cpu_device(cpu);	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);	unsigned int index = 0; 	/* skip if of_node is already populated */	if (this_cpu_ci->info_list->of_node)		return 0; 	if (!cpu_dev) {		pr_err("No cpu device for CPU %d\n", cpu);		return -ENODEV;	}	np = cpu_dev->of_node;	if (!np) {		pr_err("Failed to find cpu%d device node\n", cpu);		return -ENOENT;	} 	while (index < cache_leaves(cpu)) {		this_leaf = this_cpu_ci->info_list + index;		if (this_leaf->level != 1)			np = of_find_next_cache_node(np);		else			np = of_node_get(np);/* cpu node itself */		if (!np)			break;		this_leaf->of_node = np;		index++;	} 	if (index != cache_leaves(cpu)) /* not all OF nodes populated */		return -ENOENT; 	return 0;} static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf,					   struct cacheinfo *sib_leaf){	return sib_leaf->of_node == this_leaf->of_node;}#elsestatic inline int cache_setup_of_node(unsigned int cpu) { return 0; }static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf,					   struct cacheinfo *sib_leaf){	/*	 * For non-DT systems, assume unique level 1 cache, system-wide	 * shared caches for all other levels. This will be used only if	 * arch specific code has not populated shared_cpu_map	 */	return !(this_leaf->level == 1);}#endif static int cache_shared_cpu_map_setup(unsigned int cpu){	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);	struct cacheinfo *this_leaf, *sib_leaf;	unsigned int index;	int ret; 	ret = cache_setup_of_node(cpu);	if (ret)		return ret; 	for (index = 0; index < cache_leaves(cpu); index++) {		unsigned int i; 		this_leaf = this_cpu_ci->info_list + index;		/* skip if shared_cpu_map is already populated */		if (!cpumask_empty(&this_leaf->shared_cpu_map))			continue; 		cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);		for_each_online_cpu(i) {			struct cpu_cacheinfo *sib_cpu_ci = get_cpu_cacheinfo(i); 			if (i == cpu || !sib_cpu_ci->info_list)				continue;/* skip if itself or no cacheinfo */			sib_leaf = sib_cpu_ci->info_list + index;			if (cache_leaves_are_shared(this_leaf, sib_leaf)) {				cpumask_set_cpu(cpu, &sib_leaf->shared_cpu_map);				cpumask_set_cpu(i, &this_leaf->shared_cpu_map);			}		}	} 	return 0;} static void cache_shared_cpu_map_remove(unsigned int cpu){	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);	struct cacheinfo *this_leaf, *sib_leaf;	unsigned int sibling, index; 	for (index = 0; index < cache_leaves(cpu); index++) {		this_leaf = this_cpu_ci->info_list + index;		for_each_cpu(sibling, &this_leaf->shared_cpu_map) {			struct cpu_cacheinfo *sib_cpu_ci; 			if (sibling == cpu) /* skip itself */				continue; 			sib_cpu_ci = get_cpu_cacheinfo(sibling);			if (!sib_cpu_ci->info_list)				continue; 			sib_leaf = sib_cpu_ci->info_list + index;			cpumask_clear_cpu(cpu, &sib_leaf->shared_cpu_map);			cpumask_clear_cpu(sibling, &this_leaf->shared_cpu_map);		}		of_node_put(this_leaf->of_node);	}} static void free_cache_attributes(unsigned int cpu){	if (!per_cpu_cacheinfo(cpu))		return; 	cache_shared_cpu_map_remove(cpu); 	kfree(per_cpu_cacheinfo(cpu));	per_cpu_cacheinfo(cpu) = NULL;} int __weak init_cache_level(unsigned int cpu){	return -ENOENT;} int __weak populate_cache_leaves(unsigned int cpu){	return -ENOENT;} static int detect_cache_attributes(unsigned int cpu){	int ret; 	if (init_cache_level(cpu) || !cache_leaves(cpu))		return -ENOENT; 	per_cpu_cacheinfo(cpu) = kcalloc(cache_leaves(cpu),					 sizeof(struct cacheinfo), GFP_KERNEL);	if (per_cpu_cacheinfo(cpu) == NULL)		return -ENOMEM; 	ret = populate_cache_leaves(cpu);	if (ret)		goto free_ci;	/*	 * For systems using DT for cache hierarchy, of_node and shared_cpu_map	 * will be set up here only if they are not populated already	 */	ret = cache_shared_cpu_map_setup(cpu);	if (ret) {		pr_warn("Unable to detect cache hierarchy from DT for CPU %d\n",			cpu);		goto free_ci;	}	return 0; free_ci:	free_cache_attributes(cpu);	return ret;} /* pointer to cpuX/cache device */static DEFINE_PER_CPU(struct device *, ci_cache_dev);#define per_cpu_cache_dev(cpu)	(per_cpu(ci_cache_dev, cpu)) static cpumask_t cache_dev_map; /* pointer to array of devices for cpuX/cache/indexY */static DEFINE_PER_CPU(struct device **, ci_index_dev);#define per_cpu_index_dev(cpu)	(per_cpu(ci_index_dev, cpu))#define per_cache_index_dev(cpu, idx)	((per_cpu_index_dev(cpu))[idx]) #define show_one(file_name, object)				\static ssize_t file_name##_show(struct device *dev,		\		struct device_attribute *attr, char *buf)	\{								\	struct cacheinfo *this_leaf = dev_get_drvdata(dev);	\	return sprintf(buf, "%u\n", this_leaf->object);		\} show_one(level, level);show_one(coherency_line_size, coherency_line_size);show_one(number_of_sets, number_of_sets);show_one(physical_line_partition, physical_line_partition);show_one(ways_of_associativity, ways_of_associativity); static ssize_t size_show(struct device *dev,			 struct device_attribute *attr, char *buf){	struct cacheinfo *this_leaf = dev_get_drvdata(dev); 	return sprintf(buf, "%uK\n", this_leaf->size >> 10);} static ssize_t shared_cpumap_show_func(struct device *dev, bool list, char *buf){	struct cacheinfo *this_leaf = dev_get_drvdata(dev);	const struct cpumask *mask = &this_leaf->shared_cpu_map; 	return cpumap_print_to_pagebuf(list, buf, mask);} static ssize_t shared_cpu_map_show(struct device *dev,				   struct device_attribute *attr, char *buf){	return shared_cpumap_show_func(dev, false, buf);} static ssize_t shared_cpu_list_show(struct device *dev,				    struct device_attribute *attr, char *buf){	return shared_cpumap_show_func(dev, true, buf);} static ssize_t type_show(struct device *dev,			 struct device_attribute *attr, char *buf){	struct cacheinfo *this_leaf = dev_get_drvdata(dev); 	switch (this_leaf->type) {	case CACHE_TYPE_DATA:		return sprintf(buf, "Data\n");	case CACHE_TYPE_INST:		return sprintf(buf, "Instruction\n");	case CACHE_TYPE_UNIFIED:		return sprintf(buf, "Unified\n");	default:		return -EINVAL;	}} static ssize_t allocation_policy_show(struct device *dev,				      struct device_attribute *attr, char *buf){	struct cacheinfo *this_leaf = dev_get_drvdata(dev);	unsigned int ci_attr = this_leaf->attributes;	int n = 0; 	if ((ci_attr & CACHE_READ_ALLOCATE) && (ci_attr & CACHE_WRITE_ALLOCATE))		n = sprintf(buf, "ReadWriteAllocate\n");	else if (ci_attr & CACHE_READ_ALLOCATE)		n = sprintf(buf, "ReadAllocate\n");	else if (ci_attr & CACHE_WRITE_ALLOCATE)		n = sprintf(buf, "WriteAllocate\n");	return n;} static ssize_t write_policy_show(struct device *dev,				 struct device_attribute *attr, char *buf){	struct cacheinfo *this_leaf = dev_get_drvdata(dev);	unsigned int ci_attr = this_leaf->attributes;	int n = 0; 	if (ci_attr & CACHE_WRITE_THROUGH)		n = sprintf(buf, "WriteThrough\n");	else if (ci_attr & CACHE_WRITE_BACK)		n = sprintf(buf, "WriteBack\n");	return n;} static DEVICE_ATTR_RO(level);static DEVICE_ATTR_RO(type);static DEVICE_ATTR_RO(coherency_line_size);static DEVICE_ATTR_RO(ways_of_associativity);static DEVICE_ATTR_RO(number_of_sets);static DEVICE_ATTR_RO(size);static DEVICE_ATTR_RO(allocation_policy);static DEVICE_ATTR_RO(write_policy);static DEVICE_ATTR_RO(shared_cpu_map);static DEVICE_ATTR_RO(shared_cpu_list);static DEVICE_ATTR_RO(physical_line_partition); static struct attribute *cache_default_attrs[] = {	&dev_attr_type.attr,	&dev_attr_level.attr,	&dev_attr_shared_cpu_map.attr,	&dev_attr_shared_cpu_list.attr,	&dev_attr_coherency_line_size.attr,	&dev_attr_ways_of_associativity.attr,	&dev_attr_number_of_sets.attr,	&dev_attr_size.attr,	&dev_attr_allocation_policy.attr,	&dev_attr_write_policy.attr,	&dev_attr_physical_line_partition.attr,	NULL}; static umode_tcache_default_attrs_is_visible(struct kobject *kobj,			       struct attribute *attr, int unused){	struct device *dev = kobj_to_dev(kobj);	struct cacheinfo *this_leaf = dev_get_drvdata(dev);	const struct cpumask *mask = &this_leaf->shared_cpu_map;	umode_t mode = attr->mode; 	if ((attr == &dev_attr_type.attr) && this_leaf->type)		return mode;	if ((attr == &dev_attr_level.attr) && this_leaf->level)		return mode;	if ((attr == &dev_attr_shared_cpu_map.attr) && !cpumask_empty(mask))		return mode;	if ((attr == &dev_attr_shared_cpu_list.attr) && !cpumask_empty(mask))		return mode;	if ((attr == &dev_attr_coherency_line_size.attr) &&	    this_leaf->coherency_line_size)		return mode;	if ((attr == &dev_attr_ways_of_associativity.attr) &&	    this_leaf->size) /* allow 0 = full associativity */		return mode;	if ((attr == &dev_attr_number_of_sets.attr) &&	    this_leaf->number_of_sets)		return mode;	if ((attr == &dev_attr_size.attr) && this_leaf->size)		return mode;	if ((attr == &dev_attr_write_policy.attr) &&	    (this_leaf->attributes & CACHE_WRITE_POLICY_MASK))		return mode;	if ((attr == &dev_attr_allocation_policy.attr) &&	    (this_leaf->attributes & CACHE_ALLOCATE_POLICY_MASK))		return mode;	if ((attr == &dev_attr_physical_line_partition.attr) &&	    this_leaf->physical_line_partition)		return mode; 	return 0;} static const struct attribute_group cache_default_group = {	.attrs = cache_default_attrs,	.is_visible = cache_default_attrs_is_visible,}; static const struct attribute_group *cache_default_groups[] = {	&cache_default_group,	NULL,}; static const struct attribute_group *cache_private_groups[] = {	&cache_default_group,	NULL, /* Place holder for private group */	NULL,}; const struct attribute_group *__weak cache_get_priv_group(struct cacheinfo *this_leaf){	return NULL;} static const struct attribute_group **cache_get_attribute_groups(struct cacheinfo *this_leaf){	const struct attribute_group *priv_group =			cache_get_priv_group(this_leaf); 	if (!priv_group)		return cache_default_groups; 	if (!cache_private_groups[1])		cache_private_groups[1] = priv_group; 	return cache_private_groups;} /* Add/Remove cache interface for CPU device */static void cpu_cache_sysfs_exit(unsigned int cpu){	int i;	struct device *ci_dev; 	if (per_cpu_index_dev(cpu)) {		for (i = 0; i < cache_leaves(cpu); i++) {			ci_dev = per_cache_index_dev(cpu, i);			if (!ci_dev)				continue;			device_unregister(ci_dev);		}		kfree(per_cpu_index_dev(cpu));		per_cpu_index_dev(cpu) = NULL;	}	device_unregister(per_cpu_cache_dev(cpu));	per_cpu_cache_dev(cpu) = NULL;} static int cpu_cache_sysfs_init(unsigned int cpu){	struct device *dev = get_cpu_device(cpu); 	if (per_cpu_cacheinfo(cpu) == NULL)		return -ENOENT; 	per_cpu_cache_dev(cpu) = cpu_device_create(dev, NULL, NULL, "cache");	if (IS_ERR(per_cpu_cache_dev(cpu)))		return PTR_ERR(per_cpu_cache_dev(cpu)); 	/* Allocate all required memory */	per_cpu_index_dev(cpu) = kcalloc(cache_leaves(cpu),					 sizeof(struct device *), GFP_KERNEL);	if (unlikely(per_cpu_index_dev(cpu) == NULL))		goto err_out; 	return 0; err_out:	cpu_cache_sysfs_exit(cpu);	return -ENOMEM;} static int cache_add_dev(unsigned int cpu){	unsigned int i;	int rc;	struct device *ci_dev, *parent;	struct cacheinfo *this_leaf;	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);	const struct attribute_group **cache_groups; 	rc = cpu_cache_sysfs_init(cpu);	if (unlikely(rc < 0))		return rc; 	parent = per_cpu_cache_dev(cpu);	for (i = 0; i < cache_leaves(cpu); i++) {		this_leaf = this_cpu_ci->info_list + i;		if (this_leaf->disable_sysfs)			continue;		cache_groups = cache_get_attribute_groups(this_leaf);		ci_dev = cpu_device_create(parent, this_leaf, cache_groups,					   "index%1u", i);		if (IS_ERR(ci_dev)) {			rc = PTR_ERR(ci_dev);			goto err;		}		per_cache_index_dev(cpu, i) = ci_dev;	}	cpumask_set_cpu(cpu, &cache_dev_map); 	return 0;err:	cpu_cache_sysfs_exit(cpu);	return rc;} 

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