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iommu: iova: Move iova cache management to the iova library 

This is necessary to separate intel-iommu from the iova library.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Sakari Ailus 2015-07-13 14:31:28 +03:00 committed by David Woodhouse
parent 8f6429c7cb
commit ae1ff3d623
3 changed files with 54 additions and 39 deletions
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6
drivers/iommu/intel-iommu.c
View File

@ -3743,7 +3743,7 @@ static inline int iommu_devinfo_cache_init(void)
static int __init iommu_init_mempool(void)
{
int ret;
ret = iommu_iova_cache_init();
ret = iova_cache_get();
if (ret)
return ret;
@ -3757,7 +3757,7 @@ static int __init iommu_init_mempool(void)
kmem_cache_destroy(iommu_domain_cache);
domain_error:
iommu_iova_cache_destroy();
iova_cache_put();
return -ENOMEM;
}
@ -3766,7 +3766,7 @@ static void __init iommu_exit_mempool(void)
{
kmem_cache_destroy(iommu_devinfo_cache);
kmem_cache_destroy(iommu_domain_cache);
iommu_iova_cache_destroy();
iova_cache_put();
}
static void quirk_ioat_snb_local_iommu(struct pci_dev *pdev)

83
drivers/iommu/iova.c
View File

@ -20,40 +20,6 @@
#include <linux/iova.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)
@ -237,6 +203,55 @@ 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;
}
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);
}
/**
* alloc_iova - allocates an iova
* @iovad: - iova domain in question

4
include/linux/iova.h
View File

@ -68,8 +68,8 @@ static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova)
return iova >> iova_shift(iovad);
}
int iommu_iova_cache_init(void);
void iommu_iova_cache_destroy(void);
int iova_cache_get(void);
void iova_cache_put(void);
struct iova *alloc_iova_mem(void);
void free_iova_mem(struct iova *iova);