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Date:   Thu, 24 Sep 2020 11:21:06 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, jasowang@...hat.com
Cc:     lulu@...hat.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, rob.miller@...adcom.com,
        lingshan.zhu@...el.com, eperezma@...hat.com, hanand@...inx.com,
        mhabets@...arflare.com, eli@...lanox.com, amorenoz@...hat.com,
        maxime.coquelin@...hat.com, stefanha@...hat.com,
        sgarzare@...hat.com
Subject: [RFC PATCH 05/24] vhost-vdpa: passing iotlb to IOMMU mapping helpers

To prepare for the ASID support for vhost-vdpa, try to pass IOTLB
object to dma helpers.

Signed-off-by: Jason Wang <jasowang@...hat.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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