From: Changbin Du <changbin.du@xxxxxxxxx>
To support huge gtt, we need to support huge pages in kvmgt first.
This patch adds a 'size' param to the intel_gvt_mpt::dma_map_guest_page
API and implements it in kvmgt.
v2: rebase.
Signed-off-by: Changbin Du <changbin.du@xxxxxxxxx>
---
drivers/gpu/drm/i915/gvt/gtt.c | 6 +-
drivers/gpu/drm/i915/gvt/hypercall.h | 2 +-
drivers/gpu/drm/i915/gvt/kvmgt.c | 130 +++++++++++++++++++++++++----------
drivers/gpu/drm/i915/gvt/mpt.h | 7 +-
4 files changed, 101 insertions(+), 44 deletions(-)
diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
index 2f13464..ffeecda 100644
--- a/drivers/gpu/drm/i915/gvt/gtt.c
+++ b/drivers/gpu/drm/i915/gvt/gtt.c
@@ -1104,7 +1104,7 @@ static int split_64KB_gtt_entry(struct intel_vgpu *vgpu,
for (i = 0; i < GTT_64K_PTE_STRIDE; i++) {
ret = intel_gvt_hypervisor_dma_map_guest_page(vgpu,
- start_gfn + i, &dma_addr);
+ start_gfn + i, PAGE_SIZE, &dma_addr);
if (ret)
return ret;
@@ -1150,7 +1150,7 @@ static int ppgtt_populate_shadow_entry(struct intel_vgpu *vgpu,
};
/* direct shadow */
- ret = intel_gvt_hypervisor_dma_map_guest_page(vgpu, gfn, &dma_addr);
+ ret = intel_gvt_hypervisor_dma_map_guest_page(vgpu, gfn, PAGE_SIZE, &dma_addr);
if (ret)
return -ENXIO;
@@ -2078,7 +2078,7 @@ static int emulate_ggtt_mmio_write(struct intel_vgpu *vgpu, unsigned int off,
}
ret = intel_gvt_hypervisor_dma_map_guest_page(vgpu, gfn,
- &dma_addr);
+ PAGE_SIZE, &dma_addr);
if (ret) {
gvt_vgpu_err("fail to populate guest ggtt entry\n");
/* guest driver may read/write the entry when partial
diff --git a/drivers/gpu/drm/i915/gvt/hypercall.h b/drivers/gpu/drm/i915/gvt/hypercall.h
index f6dd9f7..5af11cf 100644
--- a/drivers/gpu/drm/i915/gvt/hypercall.h
+++ b/drivers/gpu/drm/i915/gvt/hypercall.h
@@ -53,7 +53,7 @@ struct intel_gvt_mpt {
unsigned long (*gfn_to_mfn)(unsigned long handle, unsigned long gfn);
int (*dma_map_guest_page)(unsigned long handle, unsigned long gfn,
- dma_addr_t *dma_addr);
+ unsigned long size, dma_addr_t *dma_addr);
void (*dma_unmap_guest_page)(unsigned long handle, dma_addr_t dma_addr);
int (*map_gfn_to_mfn)(unsigned long handle, unsigned long gfn,
diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index df4e4a0..4d2f53a 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -94,6 +94,7 @@ struct gvt_dma {
struct rb_node dma_addr_node;
gfn_t gfn;
dma_addr_t dma_addr;
+ unsigned long size;
struct kref ref;
};
@@ -106,51 +107,103 @@ static int kvmgt_guest_init(struct mdev_device *mdev);
static void intel_vgpu_release_work(struct work_struct *work);
static bool kvmgt_guest_exit(struct kvmgt_guest_info *info);
-static int gvt_dma_map_page(struct intel_vgpu *vgpu, unsigned long gfn,
- dma_addr_t *dma_addr)
+static void gvt_unpin_guest_page(struct intel_vgpu *vgpu, unsigned long gfn,
+ unsigned long size)
{
- struct device *dev = &vgpu->gvt->dev_priv->drm.pdev->dev;
- struct page *page;
- unsigned long pfn;
+ int total_pages;
+ int npage;
int ret;
- /* Pin the page first. */
- ret = vfio_pin_pages(mdev_dev(vgpu->vdev.mdev), &gfn, 1,
- IOMMU_READ | IOMMU_WRITE, &pfn);
- if (ret != 1) {
- gvt_vgpu_err("vfio_pin_pages failed for gfn 0x%lx: %d\n",
- gfn, ret);
- return -EINVAL;
+ total_pages = roundup(size, PAGE_SIZE) / PAGE_SIZE;
+
+ for (npage = 0; npage < total_pages; npage++) {
+ unsigned long cur_gfn = gfn + npage;
+
+ ret = vfio_unpin_pages(mdev_dev(vgpu->vdev.mdev), &cur_gfn, 1);
+ WARN_ON(ret != 1);
}
+}
- if (!pfn_valid(pfn)) {
- gvt_vgpu_err("pfn 0x%lx is not mem backed\n", pfn);
- vfio_unpin_pages(mdev_dev(vgpu->vdev.mdev), &gfn, 1);
- return -EINVAL;
+/* Pin a normal or compound guest page for dma. */
+static int gvt_pin_guest_page(struct intel_vgpu *vgpu, unsigned long gfn,
+ unsigned long size, struct page **page)
+{
+ unsigned long base_pfn = 0;
+ int total_pages;
+ int npage;
+ int ret;
+
+ total_pages = roundup(size, PAGE_SIZE) / PAGE_SIZE;
+ /*
+ * We pin the pages one-by-one to avoid allocating a big arrary
+ * on stack to hold pfns.
+ */
+ for (npage = 0; npage < total_pages; npage++) {
+ unsigned long cur_gfn = gfn + npage;
+ unsigned long pfn;
+
+ ret = vfio_pin_pages(mdev_dev(vgpu->vdev.mdev), &cur_gfn, 1,
+ IOMMU_READ | IOMMU_WRITE, &pfn);
+ if (ret != 1) {
+ gvt_vgpu_err("vfio_pin_pages failed for gfn 0x%lx, ret %d\n",
+ cur_gfn, ret);
+ goto err;
+ }
+
+ if (!pfn_valid(pfn)) {
+ gvt_vgpu_err("pfn 0x%lx is not mem backed\n", pfn);
+ npage++;
+ ret = -EFAULT;
+ goto err;
+ }
+
+ if (npage == 0)
+ base_pfn = pfn;
+ else if (base_pfn + npage != pfn) {
+ gvt_vgpu_err("The pages are not continuous\n");
+ ret = -EINVAL;
+ npage++;
+ goto err;
+ }
}
+ *page = pfn_to_page(base_pfn);
+ return 0;
+err:
+ gvt_unpin_guest_page(vgpu, gfn, npage * PAGE_SIZE);
+ return ret;
+}
+
+static int gvt_dma_map_page(struct intel_vgpu *vgpu, unsigned long gfn,
+ dma_addr_t *dma_addr, unsigned long size)
+{
+ struct device *dev = &vgpu->gvt->dev_priv->drm.pdev->dev;
+ struct page *page = NULL;
+ int ret;
+
+ ret = gvt_pin_guest_page(vgpu, gfn, size, &page);
+ if (ret)
+ return ret;
+
/* Setup DMA mapping. */
- page = pfn_to_page(pfn);
- *dma_addr = dma_map_page(dev, page, 0, PAGE_SIZE,
- PCI_DMA_BIDIRECTIONAL);
- if (dma_mapping_error(dev, *dma_addr)) {
- gvt_vgpu_err("DMA mapping failed for gfn 0x%lx\n", gfn);
- vfio_unpin_pages(mdev_dev(vgpu->vdev.mdev), &gfn, 1);
- return -ENOMEM;
+ *dma_addr = dma_map_page(dev, page, 0, size, PCI_DMA_BIDIRECTIONAL);
+ ret = dma_mapping_error(dev, *dma_addr);
+ if (ret) {
+ gvt_vgpu_err("DMA mapping failed for pfn 0x%lx, ret %d\n",
+ page_to_pfn(page), ret);
+ gvt_unpin_guest_page(vgpu, gfn, size);
}
- return 0;
+ return ret;
}
static void gvt_dma_unmap_page(struct intel_vgpu *vgpu, unsigned long gfn,
- dma_addr_t dma_addr)
+ dma_addr_t dma_addr, unsigned long size)
{
struct device *dev = &vgpu->gvt->dev_priv->drm.pdev->dev;
- int ret;
- dma_unmap_page(dev, dma_addr, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
- ret = vfio_unpin_pages(mdev_dev(vgpu->vdev.mdev), &gfn, 1);
- WARN_ON(ret != 1);
+ dma_unmap_page(dev, dma_addr, size, PCI_DMA_BIDIRECTIONAL);
+ gvt_unpin_guest_page(vgpu, gfn, size);
}
static struct gvt_dma *__gvt_cache_find_dma_addr(struct intel_vgpu *vgpu,
@@ -191,7 +244,7 @@ static struct gvt_dma *__gvt_cache_find_gfn(struct intel_vgpu *vgpu, gfn_t gfn)
}
static int __gvt_cache_add(struct intel_vgpu *vgpu, gfn_t gfn,
- dma_addr_t dma_addr)
+ dma_addr_t dma_addr, unsigned long size)
{
struct gvt_dma *new, *itr;
struct rb_node **link, *parent = NULL;
@@ -203,6 +256,7 @@ static int __gvt_cache_add(struct intel_vgpu *vgpu, gfn_t gfn,
new->vgpu = vgpu;
new->gfn = gfn;
new->dma_addr = dma_addr;
+ new->size = size;
kref_init(&new->ref);
/* gfn_cache maps gfn to struct gvt_dma. */
@@ -260,7 +314,7 @@ static void gvt_cache_destroy(struct intel_vgpu *vgpu)
break;
}
dma = rb_entry(node, struct gvt_dma, gfn_node);
- gvt_dma_unmap_page(vgpu, dma->gfn, dma->dma_addr);
+ gvt_dma_unmap_page(vgpu, dma->gfn, dma->dma_addr, dma->size);
__gvt_cache_remove_entry(vgpu, dma);
mutex_unlock(&vgpu->vdev.cache_lock);
}
@@ -515,7 +569,8 @@ static int intel_vgpu_iommu_notifier(struct notifier_block *nb,
if (!entry)
continue;
- gvt_dma_unmap_page(vgpu, entry->gfn, entry->dma_addr);
+ gvt_dma_unmap_page(vgpu, entry->gfn, entry->dma_addr,
+ entry->size);
__gvt_cache_remove_entry(vgpu, entry);
}
mutex_unlock(&vgpu->vdev.cache_lock);
@@ -1648,7 +1703,7 @@ static unsigned long kvmgt_gfn_to_pfn(unsigned long handle, unsigned long gfn)
}
int kvmgt_dma_map_guest_page(unsigned long handle, unsigned long gfn,
- dma_addr_t *dma_addr)
+ unsigned long size, dma_addr_t *dma_addr)
{
struct kvmgt_guest_info *info;
struct intel_vgpu *vgpu;
@@ -1665,11 +1720,11 @@ int kvmgt_dma_map_guest_page(unsigned long handle, unsigned long gfn,
entry = __gvt_cache_find_gfn(info->vgpu, gfn);
if (!entry) {
- ret = gvt_dma_map_page(vgpu, gfn, dma_addr);
+ ret = gvt_dma_map_page(vgpu, gfn, dma_addr, size);
if (ret)
goto err_unlock;
- ret = __gvt_cache_add(info->vgpu, gfn, *dma_addr);
+ ret = __gvt_cache_add(info->vgpu, gfn, *dma_addr, size);
if (ret)
goto err_unmap;
} else {
@@ -1681,7 +1736,7 @@ int kvmgt_dma_map_guest_page(unsigned long handle, unsigned long gfn,
return 0;
err_unmap:
- gvt_dma_unmap_page(vgpu, gfn, *dma_addr);
+ gvt_dma_unmap_page(vgpu, gfn, *dma_addr, size);
err_unlock:
mutex_unlock(&info->vgpu->vdev.cache_lock);
return ret;
@@ -1691,7 +1746,8 @@ static void __gvt_dma_release(struct kref *ref)
{
struct gvt_dma *entry = container_of(ref, typeof(*entry), ref);
- gvt_dma_unmap_page(entry->vgpu, entry->gfn, entry->dma_addr);
+ gvt_dma_unmap_page(entry->vgpu, entry->gfn, entry->dma_addr,
+ entry->size);
__gvt_cache_remove_entry(entry->vgpu, entry);
}
diff --git a/drivers/gpu/drm/i915/gvt/mpt.h b/drivers/gpu/drm/i915/gvt/mpt.h
index 32ffcd5..67f19992 100644
--- a/drivers/gpu/drm/i915/gvt/mpt.h
+++ b/drivers/gpu/drm/i915/gvt/mpt.h
@@ -230,17 +230,18 @@ static inline unsigned long intel_gvt_hypervisor_gfn_to_mfn(
/**
* intel_gvt_hypervisor_dma_map_guest_page - setup dma map for guest page
* @vgpu: a vGPU
- * @gpfn: guest pfn
+ * @gfn: guest pfn
+ * @size: page size
* @dma_addr: retrieve allocated dma addr
*
* Returns:
* 0 on success, negative error code if failed.
*/
static inline int intel_gvt_hypervisor_dma_map_guest_page(
- struct intel_vgpu *vgpu, unsigned long gfn,
+ struct intel_vgpu *vgpu, unsigned long gfn, unsigned long size,
dma_addr_t *dma_addr)
{
- return intel_gvt_host.mpt->dma_map_guest_page(vgpu->handle, gfn,
+ return intel_gvt_host.mpt->dma_map_guest_page(vgpu->handle, gfn, size,
dma_addr);
}
--
2.7.4
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