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intel-iommu: Remove superfluous iova_alloc_lock from IOVA code

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We only ever obtain this lock immediately before the iova_rbtree_lock,
and release it immediately after the iova_rbtree_lock. So ditch it and
just use iova_rbtree_lock.

[v2: Remove the lockdep bits this time too]
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Woodhouse 2009-07-08 15:23:30 +01:00
parent 147202aa77
commit 3d39cecc48
3 changed files with 4 additions and 16 deletions
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3
drivers/pci/intel-iommu.c
View file

@ -1309,7 +1309,6 @@ static void iommu_detach_domain(struct dmar_domain *domain,
}
static struct iova_domain reserved_iova_list;
static struct lock_class_key reserved_alloc_key;
static struct lock_class_key reserved_rbtree_key;
static void dmar_init_reserved_ranges(void)
@ -1320,8 +1319,6 @@ static void dmar_init_reserved_ranges(void)
init_iova_domain(&reserved_iova_list, DMA_32BIT_PFN);
lockdep_set_class(&reserved_iova_list.iova_alloc_lock,
&reserved_alloc_key);
lockdep_set_class(&reserved_iova_list.iova_rbtree_lock,
&reserved_rbtree_key);

16
drivers/pci/iova.c
View file

@ -22,7 +22,6 @@
void
init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit)
{
spin_lock_init(&iovad->iova_alloc_lock);
spin_lock_init(&iovad->iova_rbtree_lock);
iovad->rbroot = RB_ROOT;
iovad->cached32_node = NULL;
@ -205,7 +204,6 @@ alloc_iova(struct iova_domain *iovad, unsigned long size,
unsigned long limit_pfn,
bool size_aligned)
{
unsigned long flags;
struct iova *new_iova;
int ret;
@ -219,11 +217,9 @@ alloc_iova(struct iova_domain *iovad, unsigned long size,
if (size_aligned)
size = __roundup_pow_of_two(size);
spin_lock_irqsave(&iovad->iova_alloc_lock, flags);
ret = __alloc_and_insert_iova_range(iovad, size, limit_pfn,
new_iova, size_aligned);
spin_unlock_irqrestore(&iovad->iova_alloc_lock, flags);
if (ret) {
free_iova_mem(new_iova);
return NULL;
@ -381,8 +377,7 @@ reserve_iova(struct iova_domain *iovad,
struct iova *iova;
unsigned int overlap = 0;
spin_lock_irqsave(&iovad->iova_alloc_lock, flags);
spin_lock(&iovad->iova_rbtree_lock);
spin_lock_irqsave(&iovad->iova_rbtree_lock, flags);
for (node = rb_first(&iovad->rbroot); node; node = rb_next(node)) {
if (__is_range_overlap(node, pfn_lo, pfn_hi)) {
iova = container_of(node, struct iova, node);
@ -402,8 +397,7 @@ reserve_iova(struct iova_domain *iovad,
iova = __insert_new_range(iovad, pfn_lo, pfn_hi);
finish:
spin_unlock(&iovad->iova_rbtree_lock);
spin_unlock_irqrestore(&iovad->iova_alloc_lock, flags);
spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
return iova;
}
@ -420,8 +414,7 @@ copy_reserved_iova(struct iova_domain *from, struct iova_domain *to)
unsigned long flags;
struct rb_node *node;
spin_lock_irqsave(&from->iova_alloc_lock, flags);
spin_lock(&from->iova_rbtree_lock);
spin_lock_irqsave(&from->iova_rbtree_lock, flags);
for (node = rb_first(&from->rbroot); node; node = rb_next(node)) {
struct iova *iova = container_of(node, struct iova, node);
struct iova *new_iova;
@ -430,6 +423,5 @@ copy_reserved_iova(struct iova_domain *from, struct iova_domain *to)
printk(KERN_ERR "Reserve iova range %lx@%lx failed\n",
iova->pfn_lo, iova->pfn_lo);
}
spin_unlock(&from->iova_rbtree_lock);
spin_unlock_irqrestore(&from->iova_alloc_lock, flags);
spin_unlock_irqrestore(&from->iova_rbtree_lock, flags);
}

1
include/linux/iova.h
View file

@ -28,7 +28,6 @@ struct iova {
/* holds all the iova translations for a domain */
struct iova_domain {
spinlock_t iova_alloc_lock;/* Lock to protect iova allocation */
spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */
struct rb_root rbroot; /* iova domain rbtree root */
struct rb_node *cached32_node; /* Save last alloced node */