Revert this dead code:
commit 898b9eaeb3fe ("vfio/type1: block on invalid vaddr")
Signed-off-by: Steve Sistare <steven.sistare@xxxxxxxxxx>
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
---
drivers/vfio/vfio_iommu_type1.c | 94 +++--------------------------------------
1 file changed, 5 insertions(+), 89 deletions(-)
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 1036736..eb2d243 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -72,7 +72,6 @@ struct vfio_iommu {
unsigned int vaddr_invalid_count;
uint64_t pgsize_bitmap;
uint64_t num_non_pinned_groups;
- wait_queue_head_t vaddr_wait;
bool v2;
bool nesting;
bool dirty_page_tracking;
@@ -154,8 +153,6 @@ struct vfio_regions {
#define DIRTY_BITMAP_PAGES_MAX ((u64)INT_MAX)
#define DIRTY_BITMAP_SIZE_MAX DIRTY_BITMAP_BYTES(DIRTY_BITMAP_PAGES_MAX)
-#define WAITED 1
-
static int put_pfn(unsigned long pfn, int prot);
static struct vfio_iommu_group*
@@ -606,61 +603,6 @@ static int vaddr_get_pfns(struct mm_struct *mm, unsigned long vaddr,
return ret;
}
-static int vfio_wait(struct vfio_iommu *iommu)
-{
- DEFINE_WAIT(wait);
-
- prepare_to_wait(&iommu->vaddr_wait, &wait, TASK_KILLABLE);
- mutex_unlock(&iommu->lock);
- schedule();
- mutex_lock(&iommu->lock);
- finish_wait(&iommu->vaddr_wait, &wait);
- if (kthread_should_stop() || !iommu->container_open ||
- fatal_signal_pending(current)) {
- return -EFAULT;
- }
- return WAITED;
-}
-
-/*
- * Find dma struct and wait for its vaddr to be valid. iommu lock is dropped
- * if the task waits, but is re-locked on return. Return result in *dma_p.
- * Return 0 on success with no waiting, WAITED on success if waited, and -errno
- * on error.
- */
-static int vfio_find_dma_valid(struct vfio_iommu *iommu, dma_addr_t start,
- size_t size, struct vfio_dma **dma_p)
-{
- int ret = 0;
-
- do {
- *dma_p = vfio_find_dma(iommu, start, size);
- if (!*dma_p)
- return -EINVAL;
- else if (!(*dma_p)->vaddr_invalid)
- return ret;
- else
- ret = vfio_wait(iommu);
- } while (ret == WAITED);
-
- return ret;
-}
-
-/*
- * Wait for all vaddr in the dma_list to become valid. iommu lock is dropped
- * if the task waits, but is re-locked on return. Return 0 on success with no
- * waiting, WAITED on success if waited, and -errno on error.
- */
-static int vfio_wait_all_valid(struct vfio_iommu *iommu)
-{
- int ret = 0;
-
- while (iommu->vaddr_invalid_count && ret >= 0)
- ret = vfio_wait(iommu);
-
- return ret;
-}
-
/*
* Attempt to pin pages. We really don't want to track all the pfns and
* the iommu can only map chunks of consecutive pfns anyway, so get the
@@ -861,7 +803,6 @@ static int vfio_iommu_type1_pin_pages(void *iommu_data,
unsigned long remote_vaddr;
struct vfio_dma *dma;
bool do_accounting;
- dma_addr_t iova;
if (!iommu || !pages)
return -EINVAL;
@@ -878,22 +819,6 @@ static int vfio_iommu_type1_pin_pages(void *iommu_data,
goto pin_done;
}
- /*
- * Wait for all necessary vaddr's to be valid so they can be used in
- * the main loop without dropping the lock, to avoid racing vs unmap.
- */
-again:
- if (iommu->vaddr_invalid_count) {
- for (i = 0; i < npage; i++) {
- iova = user_iova + PAGE_SIZE * i;
- ret = vfio_find_dma_valid(iommu, iova, PAGE_SIZE, &dma);
- if (ret < 0)
- goto pin_done;
- if (ret == WAITED)
- goto again;
- }
- }
-
/* Fail if no dma_umap notifier is registered */
if (list_empty(&iommu->device_list)) {
ret = -EINVAL;
@@ -909,6 +834,7 @@ static int vfio_iommu_type1_pin_pages(void *iommu_data,
for (i = 0; i < npage; i++) {
unsigned long phys_pfn;
+ dma_addr_t iova;
struct vfio_pfn *vpfn;
iova = user_iova + PAGE_SIZE * i;
@@ -1193,10 +1119,8 @@ static void vfio_remove_dma(struct vfio_iommu *iommu, struct vfio_dma *dma)
put_task_struct(dma->task);
mmdrop(dma->mm);
vfio_dma_bitmap_free(dma);
- if (dma->vaddr_invalid) {
+ if (dma->vaddr_invalid)
iommu->vaddr_invalid_count--;
- wake_up_all(&iommu->vaddr_wait);
- }
kfree(dma);
iommu->dma_avail++;
}
@@ -1674,7 +1598,6 @@ static int vfio_dma_do_map(struct vfio_iommu *iommu,
dma->vaddr = vaddr;
dma->vaddr_invalid = false;
iommu->vaddr_invalid_count--;
- wake_up_all(&iommu->vaddr_wait);
}
goto out_unlock;
} else if (dma) {
@@ -1757,10 +1680,6 @@ static int vfio_iommu_replay(struct vfio_iommu *iommu,
unsigned long limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
int ret;
- ret = vfio_wait_all_valid(iommu);
- if (ret < 0)
- return ret;
-
/* Arbitrarily pick the first domain in the list for lookups */
if (!list_empty(&iommu->domain_list))
d = list_first_entry(&iommu->domain_list,
@@ -2651,7 +2570,6 @@ static void *vfio_iommu_type1_open(unsigned long arg)
mutex_init(&iommu->lock);
mutex_init(&iommu->device_list_lock);
INIT_LIST_HEAD(&iommu->device_list);
- init_waitqueue_head(&iommu->vaddr_wait);
iommu->pgsize_bitmap = PAGE_MASK;
INIT_LIST_HEAD(&iommu->emulated_iommu_groups);
@@ -3148,13 +3066,12 @@ static int vfio_iommu_type1_dma_rw_chunk(struct vfio_iommu *iommu,
struct vfio_dma *dma;
bool kthread = current->mm == NULL;
size_t offset;
- int ret;
*copied = 0;
- ret = vfio_find_dma_valid(iommu, user_iova, 1, &dma);
- if (ret < 0)
- return ret;
+ dma = vfio_find_dma(iommu, user_iova, 1);
+ if (!dma)
+ return -EINVAL;
if ((write && !(dma->prot & IOMMU_WRITE)) ||
!(dma->prot & IOMMU_READ))
@@ -3263,7 +3180,6 @@ static void vfio_iommu_type1_notify(void *iommu_data,
mutex_lock(&iommu->lock);
iommu->container_open = false;
mutex_unlock(&iommu->lock);
- wake_up_all(&iommu->vaddr_wait);
}
static const struct vfio_iommu_driver_ops vfio_iommu_driver_ops_type1 = {
--
1.8.3.1
