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Subject[RFC PATCH 05/24] vhost-vdpa: passing iotlb to IOMMU mapping helpers
Date
To prepare for the ASID support for vhost-vdpa, try to pass IOTLB
object to dma helpers.

Signed-off-by: Jason Wang <jasowang@redhat.com>
---
drivers/vhost/vdpa.c | 40 ++++++++++++++++++++++------------------
1 file changed, 22 insertions(+), 18 deletions(-)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 9c641274b9f3..74bef1c15a70 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -489,10 +489,11 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
return r;
}

-static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v, u64 start, u64 last)
+static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v,
+ struct vhost_iotlb *iotlb,
+ u64 start, u64 last)
{
struct vhost_dev *dev = &v->vdev;
- struct vhost_iotlb *iotlb = dev->iotlb;
struct vhost_iotlb_map *map;
struct page *page;
unsigned long pfn, pinned;
@@ -514,8 +515,9 @@ static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v, u64 start, u64 last)
static void vhost_vdpa_iotlb_free(struct vhost_vdpa *v)
{
struct vhost_dev *dev = &v->vdev;
+ struct vhost_iotlb *iotlb = dev->iotlb;

- vhost_vdpa_iotlb_unmap(v, 0ULL, 0ULL - 1);
+ vhost_vdpa_iotlb_unmap(v, iotlb, 0ULL, 0ULL - 1);
kfree(dev->iotlb);
dev->iotlb = NULL;
}
@@ -542,15 +544,14 @@ static int perm_to_iommu_flags(u32 perm)
return flags | IOMMU_CACHE;
}

-static int vhost_vdpa_map(struct vhost_vdpa *v,
+static int vhost_vdpa_map(struct vhost_vdpa *v, struct vhost_iotlb *iotlb,
u64 iova, u64 size, u64 pa, u32 perm)
{
- struct vhost_dev *dev = &v->vdev;
struct vdpa_device *vdpa = v->vdpa;
const struct vdpa_config_ops *ops = vdpa->config;
int r = 0;

- r = vhost_iotlb_add_range(dev->iotlb, iova, iova + size - 1,
+ r = vhost_iotlb_add_range(iotlb, iova, iova + size - 1,
pa, perm);
if (r)
return r;
@@ -559,7 +560,7 @@ static int vhost_vdpa_map(struct vhost_vdpa *v,
r = ops->dma_map(vdpa, iova, size, pa, perm);
} else if (ops->set_map) {
if (!v->in_batch)
- r = ops->set_map(vdpa, dev->iotlb);
+ r = ops->set_map(vdpa, iotlb);
} else {
r = iommu_map(v->domain, iova, pa, size,
perm_to_iommu_flags(perm));
@@ -568,29 +569,30 @@ static int vhost_vdpa_map(struct vhost_vdpa *v,
return r;
}

-static void vhost_vdpa_unmap(struct vhost_vdpa *v, u64 iova, u64 size)
+static void vhost_vdpa_unmap(struct vhost_vdpa *v,
+ struct vhost_iotlb *iotlb,
+ u64 iova, u64 size)
{
- struct vhost_dev *dev = &v->vdev;
struct vdpa_device *vdpa = v->vdpa;
const struct vdpa_config_ops *ops = vdpa->config;

- vhost_vdpa_iotlb_unmap(v, iova, iova + size - 1);
+ vhost_vdpa_iotlb_unmap(v, iotlb, iova, iova + size - 1);

if (ops->dma_map) {
ops->dma_unmap(vdpa, iova, size);
} else if (ops->set_map) {
if (!v->in_batch)
- ops->set_map(vdpa, dev->iotlb);
+ ops->set_map(vdpa, iotlb);
} else {
iommu_unmap(v->domain, iova, size);
}
}

static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v,
+ struct vhost_iotlb *iotlb,
struct vhost_iotlb_msg *msg)
{
struct vhost_dev *dev = &v->vdev;
- struct vhost_iotlb *iotlb = dev->iotlb;
struct page **page_list;
unsigned long list_size = PAGE_SIZE / sizeof(struct page *);
unsigned int gup_flags = FOLL_LONGTERM;
@@ -644,7 +646,7 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v,
if (last_pfn && (this_pfn != last_pfn + 1)) {
/* Pin a contiguous chunk of memory */
csize = (last_pfn - map_pfn + 1) << PAGE_SHIFT;
- if (vhost_vdpa_map(v, iova, csize,
+ if (vhost_vdpa_map(v, iotlb, iova, csize,
map_pfn << PAGE_SHIFT,
msg->perm))
goto out;
@@ -660,11 +662,12 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v,
}

/* Pin the rest chunk */
- ret = vhost_vdpa_map(v, iova, (last_pfn - map_pfn + 1) << PAGE_SHIFT,
+ ret = vhost_vdpa_map(v, iotlb, iova,
+ (last_pfn - map_pfn + 1) << PAGE_SHIFT,
map_pfn << PAGE_SHIFT, msg->perm);
out:
if (ret) {
- vhost_vdpa_unmap(v, msg->iova, msg->size);
+ vhost_vdpa_unmap(v, iotlb, msg->iova, msg->size);
atomic64_sub(npages, &dev->mm->pinned_vm);
}
mmap_read_unlock(dev->mm);
@@ -678,6 +681,7 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev,
struct vhost_vdpa *v = container_of(dev, struct vhost_vdpa, vdev);
struct vdpa_device *vdpa = v->vdpa;
const struct vdpa_config_ops *ops = vdpa->config;
+ struct vhost_iotlb *iotlb = dev->iotlb;
int r = 0;

r = vhost_dev_check_owner(dev);
@@ -686,17 +690,17 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev,

switch (msg->type) {
case VHOST_IOTLB_UPDATE:
- r = vhost_vdpa_process_iotlb_update(v, msg);
+ r = vhost_vdpa_process_iotlb_update(v, iotlb, msg);
break;
case VHOST_IOTLB_INVALIDATE:
- vhost_vdpa_unmap(v, msg->iova, msg->size);
+ vhost_vdpa_unmap(v, iotlb, msg->iova, msg->size);
break;
case VHOST_IOTLB_BATCH_BEGIN:
v->in_batch = true;
break;
case VHOST_IOTLB_BATCH_END:
if (v->in_batch && ops->set_map)
- ops->set_map(vdpa, dev->iotlb);
+ ops->set_map(vdpa, iotlb);
v->in_batch = false;
break;
default:
--
2.20.1
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