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authorJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-11 10:41:07 +0300
committerJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-13 08:17:18 +0300
commite09b41010ba33a20a87472ee821fa407a5b8da36 (patch)
treed10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/drivers/iommu/iova.c
parentf93b97fd65072de626c074dbe099a1fff05ce060 (diff)
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page. During the rebasing, the following patch collided: Force tick interrupt and get rid of softirq magic(I70131fb85). Collisions have been removed because its logic was found on the source already. Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769 Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/drivers/iommu/iova.c')
-rw-r--r--kernel/drivers/iommu/iova.c124
1 files changed, 73 insertions, 51 deletions
diff --git a/kernel/drivers/iommu/iova.c b/kernel/drivers/iommu/iova.c
index 9dd820831..fa0adef32 100644
--- a/kernel/drivers/iommu/iova.c
+++ b/kernel/drivers/iommu/iova.c
@@ -18,42 +18,9 @@
*/
#include <linux/iova.h>
+#include <linux/module.h>
#include <linux/slab.h>
-static struct kmem_cache *iommu_iova_cache;
-
-int iommu_iova_cache_init(void)
-{
- int ret = 0;
-
- iommu_iova_cache = kmem_cache_create("iommu_iova",
- sizeof(struct iova),
- 0,
- SLAB_HWCACHE_ALIGN,
- NULL);
- if (!iommu_iova_cache) {
- pr_err("Couldn't create iova cache\n");
- ret = -ENOMEM;
- }
-
- return ret;
-}
-
-void iommu_iova_cache_destroy(void)
-{
- kmem_cache_destroy(iommu_iova_cache);
-}
-
-struct iova *alloc_iova_mem(void)
-{
- return kmem_cache_alloc(iommu_iova_cache, GFP_ATOMIC);
-}
-
-void free_iova_mem(struct iova *iova)
-{
- kmem_cache_free(iommu_iova_cache, iova);
-}
-
void
init_iova_domain(struct iova_domain *iovad, unsigned long granule,
unsigned long start_pfn, unsigned long pfn_32bit)
@@ -72,6 +39,7 @@ init_iova_domain(struct iova_domain *iovad, unsigned long granule,
iovad->start_pfn = start_pfn;
iovad->dma_32bit_pfn = pfn_32bit;
}
+EXPORT_SYMBOL_GPL(init_iova_domain);
static struct rb_node *
__get_cached_rbnode(struct iova_domain *iovad, unsigned long *limit_pfn)
@@ -120,19 +88,14 @@ __cached_rbnode_delete_update(struct iova_domain *iovad, struct iova *free)
}
}
-/* Computes the padding size required, to make the
- * the start address naturally aligned on its size
+/*
+ * Computes the padding size required, to make the start address
+ * naturally aligned on the power-of-two order of its size
*/
-static int
-iova_get_pad_size(int size, unsigned int limit_pfn)
+static unsigned int
+iova_get_pad_size(unsigned int size, unsigned int limit_pfn)
{
- unsigned int pad_size = 0;
- unsigned int order = ilog2(size);
-
- if (order)
- pad_size = (limit_pfn + 1) % (1 << order);
-
- return pad_size;
+ return (limit_pfn + 1 - size) & (__roundup_pow_of_two(size) - 1);
}
static int __alloc_and_insert_iova_range(struct iova_domain *iovad,
@@ -227,6 +190,7 @@ iova_insert_rbtree(struct rb_root *root, struct iova *iova)
/* Figure out where to put new node */
while (*new) {
struct iova *this = container_of(*new, struct iova, node);
+
parent = *new;
if (iova->pfn_lo < this->pfn_lo)
@@ -241,6 +205,57 @@ iova_insert_rbtree(struct rb_root *root, struct iova *iova)
rb_insert_color(&iova->node, root);
}
+static struct kmem_cache *iova_cache;
+static unsigned int iova_cache_users;
+static DEFINE_MUTEX(iova_cache_mutex);
+
+struct iova *alloc_iova_mem(void)
+{
+ return kmem_cache_alloc(iova_cache, GFP_ATOMIC);
+}
+EXPORT_SYMBOL(alloc_iova_mem);
+
+void free_iova_mem(struct iova *iova)
+{
+ kmem_cache_free(iova_cache, iova);
+}
+EXPORT_SYMBOL(free_iova_mem);
+
+int iova_cache_get(void)
+{
+ 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) {
+ mutex_unlock(&iova_cache_mutex);
+ printk(KERN_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)
+ 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
@@ -264,12 +279,6 @@ alloc_iova(struct iova_domain *iovad, unsigned long size,
if (!new_iova)
return NULL;
- /* If size aligned is set then round the size to
- * to next power of two.
- */
- if (size_aligned)
- size = __roundup_pow_of_two(size);
-
ret = __alloc_and_insert_iova_range(iovad, size, limit_pfn,
new_iova, size_aligned);
@@ -280,6 +289,7 @@ alloc_iova(struct iova_domain *iovad, unsigned long size,
return new_iova;
}
+EXPORT_SYMBOL_GPL(alloc_iova);
/**
* find_iova - find's an iova for a given pfn
@@ -320,6 +330,7 @@ struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn)
spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
return NULL;
}
+EXPORT_SYMBOL_GPL(find_iova);
/**
* __free_iova - frees the given iova
@@ -338,6 +349,7 @@ __free_iova(struct iova_domain *iovad, struct iova *iova)
spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
free_iova_mem(iova);
}
+EXPORT_SYMBOL_GPL(__free_iova);
/**
* free_iova - finds and frees the iova for a given pfn
@@ -350,10 +362,12 @@ void
free_iova(struct iova_domain *iovad, unsigned long pfn)
{
struct iova *iova = find_iova(iovad, pfn);
+
if (iova)
__free_iova(iovad, iova);
}
+EXPORT_SYMBOL_GPL(free_iova);
/**
* put_iova_domain - destroys the iova doamin
@@ -369,12 +383,14 @@ void put_iova_domain(struct iova_domain *iovad)
node = rb_first(&iovad->rbroot);
while (node) {
struct iova *iova = container_of(node, struct iova, node);
+
rb_erase(node, &iovad->rbroot);
free_iova_mem(iova);
node = rb_first(&iovad->rbroot);
}
spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
}
+EXPORT_SYMBOL_GPL(put_iova_domain);
static int
__is_range_overlap(struct rb_node *node,
@@ -464,6 +480,7 @@ finish:
spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
return iova;
}
+EXPORT_SYMBOL_GPL(reserve_iova);
/**
* copy_reserved_iova - copies the reserved between domains
@@ -482,6 +499,7 @@ copy_reserved_iova(struct iova_domain *from, struct iova_domain *to)
for (node = rb_first(&from->rbroot); node; node = rb_next(node)) {
struct iova *iova = container_of(node, struct iova, node);
struct iova *new_iova;
+
new_iova = reserve_iova(to, iova->pfn_lo, iova->pfn_hi);
if (!new_iova)
printk(KERN_ERR "Reserve iova range %lx@%lx failed\n",
@@ -489,6 +507,7 @@ copy_reserved_iova(struct iova_domain *from, struct iova_domain *to)
}
spin_unlock_irqrestore(&from->iova_rbtree_lock, flags);
}
+EXPORT_SYMBOL_GPL(copy_reserved_iova);
struct iova *
split_and_remove_iova(struct iova_domain *iovad, struct iova *iova,
@@ -530,3 +549,6 @@ error:
free_iova_mem(prev);
return NULL;
}
+
+MODULE_AUTHOR("Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>");
+MODULE_LICENSE("GPL");