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Diffstat (limited to 'drivers/iommu/iova.c')
-rw-r--r--drivers/iommu/iova.c143
1 files changed, 76 insertions, 67 deletions
diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c
index d30e453d0fb4..d59d0ea2fd21 100644
--- a/drivers/iommu/iova.c
+++ b/drivers/iommu/iova.c
@@ -24,24 +24,8 @@ static bool iova_rcache_insert(struct iova_domain *iovad,
static unsigned long iova_rcache_get(struct iova_domain *iovad,
unsigned long size,
unsigned long limit_pfn);
-static void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *iovad);
static void free_iova_rcaches(struct iova_domain *iovad);
-
-unsigned long iova_rcache_range(void)
-{
- return PAGE_SIZE << (IOVA_RANGE_CACHE_MAX_SIZE - 1);
-}
-
-static int iova_cpuhp_dead(unsigned int cpu, struct hlist_node *node)
-{
- struct iova_domain *iovad;
-
- iovad = hlist_entry_safe(node, struct iova_domain, cpuhp_dead);
-
- free_cpu_cached_iovas(cpu, iovad);
- return 0;
-}
-
+static void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *iovad);
static void free_global_cached_iovas(struct iova_domain *iovad);
static struct iova *to_iova(struct rb_node *node)
@@ -252,54 +236,6 @@ static void free_iova_mem(struct iova *iova)
kmem_cache_free(iova_cache, iova);
}
-int iova_cache_get(void)
-{
- mutex_lock(&iova_cache_mutex);
- if (!iova_cache_users) {
- int ret;
-
- ret = cpuhp_setup_state_multi(CPUHP_IOMMU_IOVA_DEAD, "iommu/iova:dead", NULL,
- iova_cpuhp_dead);
- if (ret) {
- mutex_unlock(&iova_cache_mutex);
- pr_err("Couldn't register cpuhp handler\n");
- return ret;
- }
-
- iova_cache = kmem_cache_create(
- "iommu_iova", sizeof(struct iova), 0,
- SLAB_HWCACHE_ALIGN, NULL);
- if (!iova_cache) {
- cpuhp_remove_multi_state(CPUHP_IOMMU_IOVA_DEAD);
- mutex_unlock(&iova_cache_mutex);
- pr_err("Couldn't create iova cache\n");
- return -ENOMEM;
- }
- }
-
- iova_cache_users++;
- mutex_unlock(&iova_cache_mutex);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(iova_cache_get);
-
-void iova_cache_put(void)
-{
- mutex_lock(&iova_cache_mutex);
- if (WARN_ON(!iova_cache_users)) {
- mutex_unlock(&iova_cache_mutex);
- return;
- }
- iova_cache_users--;
- if (!iova_cache_users) {
- cpuhp_remove_multi_state(CPUHP_IOMMU_IOVA_DEAD);
- kmem_cache_destroy(iova_cache);
- }
- mutex_unlock(&iova_cache_mutex);
-}
-EXPORT_SYMBOL_GPL(iova_cache_put);
-
/**
* alloc_iova - allocates an iova
* @iovad: - iova domain in question
@@ -654,11 +590,18 @@ struct iova_rcache {
struct delayed_work work;
};
+static struct kmem_cache *iova_magazine_cache;
+
+unsigned long iova_rcache_range(void)
+{
+ return PAGE_SIZE << (IOVA_RANGE_CACHE_MAX_SIZE - 1);
+}
+
static struct iova_magazine *iova_magazine_alloc(gfp_t flags)
{
struct iova_magazine *mag;
- mag = kmalloc(sizeof(*mag), flags);
+ mag = kmem_cache_alloc(iova_magazine_cache, flags);
if (mag)
mag->size = 0;
@@ -667,7 +610,7 @@ static struct iova_magazine *iova_magazine_alloc(gfp_t flags)
static void iova_magazine_free(struct iova_magazine *mag)
{
- kfree(mag);
+ kmem_cache_free(iova_magazine_cache, mag);
}
static void
@@ -990,5 +933,71 @@ static void free_global_cached_iovas(struct iova_domain *iovad)
spin_unlock_irqrestore(&rcache->lock, flags);
}
}
+
+static int iova_cpuhp_dead(unsigned int cpu, struct hlist_node *node)
+{
+ struct iova_domain *iovad;
+
+ iovad = hlist_entry_safe(node, struct iova_domain, cpuhp_dead);
+
+ free_cpu_cached_iovas(cpu, iovad);
+ return 0;
+}
+
+int iova_cache_get(void)
+{
+ int err = -ENOMEM;
+
+ mutex_lock(&iova_cache_mutex);
+ if (!iova_cache_users) {
+ iova_cache = kmem_cache_create("iommu_iova", sizeof(struct iova), 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+ if (!iova_cache)
+ goto out_err;
+
+ iova_magazine_cache = kmem_cache_create("iommu_iova_magazine",
+ sizeof(struct iova_magazine),
+ 0, SLAB_HWCACHE_ALIGN, NULL);
+ if (!iova_magazine_cache)
+ goto out_err;
+
+ err = cpuhp_setup_state_multi(CPUHP_IOMMU_IOVA_DEAD, "iommu/iova:dead",
+ NULL, iova_cpuhp_dead);
+ if (err) {
+ pr_err("IOVA: Couldn't register cpuhp handler: %pe\n", ERR_PTR(err));
+ goto out_err;
+ }
+ }
+
+ iova_cache_users++;
+ mutex_unlock(&iova_cache_mutex);
+
+ return 0;
+
+out_err:
+ kmem_cache_destroy(iova_cache);
+ kmem_cache_destroy(iova_magazine_cache);
+ mutex_unlock(&iova_cache_mutex);
+ return err;
+}
+EXPORT_SYMBOL_GPL(iova_cache_get);
+
+void iova_cache_put(void)
+{
+ mutex_lock(&iova_cache_mutex);
+ if (WARN_ON(!iova_cache_users)) {
+ mutex_unlock(&iova_cache_mutex);
+ return;
+ }
+ iova_cache_users--;
+ if (!iova_cache_users) {
+ cpuhp_remove_multi_state(CPUHP_IOMMU_IOVA_DEAD);
+ kmem_cache_destroy(iova_cache);
+ kmem_cache_destroy(iova_magazine_cache);
+ }
+ mutex_unlock(&iova_cache_mutex);
+}
+EXPORT_SYMBOL_GPL(iova_cache_put);
+
MODULE_AUTHOR("Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>");
MODULE_LICENSE("GPL");