[PATCH 17/24] drm/virtio: implement blob resources: implement vram object
Gurchetan Singh
gurchetansingh at chromium.org
Fri Aug 14 02:39:53 UTC 2020
From: Gerd Hoffmann <kraxel at redhat.com>
A virtio-gpu vram object is based on range-based allocation.
No guest shmemfs backing, so we call drm_gem_private_object_init.
This is for host memory without any guest backing (atleast initially).
Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>
Co-developed-by: Gurchetan Singh <gurchetansingh at chromium.org>
Signed-off-by: Gurchetan Singh <gurchetansingh at chromium.org>
Acked-by: Tomeu Vizoso <tomeu.vizoso at collabora.com>
---
drivers/gpu/drm/virtio/Makefile | 2 +-
drivers/gpu/drm/virtio/virtgpu_debugfs.c | 18 +++
drivers/gpu/drm/virtio/virtgpu_drv.h | 23 ++++
drivers/gpu/drm/virtio/virtgpu_kms.c | 8 ++
drivers/gpu/drm/virtio/virtgpu_object.c | 12 ++
drivers/gpu/drm/virtio/virtgpu_vq.c | 66 +++++++++
drivers/gpu/drm/virtio/virtgpu_vram.c | 162 +++++++++++++++++++++++
7 files changed, 290 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/virtio/virtgpu_vram.c
diff --git a/drivers/gpu/drm/virtio/Makefile b/drivers/gpu/drm/virtio/Makefile
index 92aa2b3d349d..b99fa4a73b68 100644
--- a/drivers/gpu/drm/virtio/Makefile
+++ b/drivers/gpu/drm/virtio/Makefile
@@ -3,7 +3,7 @@
# Makefile for the drm device driver. This driver provides support for the
# Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
-virtio-gpu-y := virtgpu_drv.o virtgpu_kms.o virtgpu_gem.o \
+virtio-gpu-y := virtgpu_drv.o virtgpu_kms.o virtgpu_gem.o virtgpu_vram.o \
virtgpu_display.o virtgpu_vq.o \
virtgpu_fence.o virtgpu_object.o virtgpu_debugfs.o virtgpu_plane.o \
virtgpu_ioctl.o virtgpu_prime.o virtgpu_trace_points.o
diff --git a/drivers/gpu/drm/virtio/virtgpu_debugfs.c b/drivers/gpu/drm/virtio/virtgpu_debugfs.c
index ea27cae28ab4..f81cfbff8c0b 100644
--- a/drivers/gpu/drm/virtio/virtgpu_debugfs.c
+++ b/drivers/gpu/drm/virtio/virtgpu_debugfs.c
@@ -71,9 +71,27 @@ virtio_gpu_debugfs_irq_info(struct seq_file *m, void *data)
return 0;
}
+static int
+virtio_gpu_debugfs_host_visible_mm(struct seq_file *m, void *data)
+{
+ struct drm_info_node *node = (struct drm_info_node *) m->private;
+ struct virtio_gpu_device *vgdev = node->minor->dev->dev_private;
+ struct drm_printer p;
+
+ if (!vgdev->has_host_visible) {
+ seq_printf(m, "Host allocations not visible to guest\n");
+ return 0;
+ }
+
+ p = drm_seq_file_printer(m);
+ drm_mm_print(&vgdev->host_visible_mm, &p);
+ return 0;
+}
+
static struct drm_info_list virtio_gpu_debugfs_list[] = {
{ "virtio-gpu-features", virtio_gpu_features },
{ "virtio-gpu-irq-fence", virtio_gpu_debugfs_irq_info, 0, NULL },
+ { "virtio-gpu-host-visible-mm", virtio_gpu_debugfs_host_visible_mm },
};
#define VIRTIO_GPU_DEBUGFS_ENTRIES ARRAY_SIZE(virtio_gpu_debugfs_list)
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index 34636cb5a93c..61f57b04525b 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -99,9 +99,19 @@ struct virtio_gpu_object_shmem {
uint32_t mapped;
};
+struct virtio_gpu_object_vram {
+ struct virtio_gpu_object base;
+ uint32_t map_state;
+ uint32_t map_info;
+ struct drm_mm_node vram_node;
+};
+
#define to_virtio_gpu_shmem(virtio_gpu_object) \
container_of((virtio_gpu_object), struct virtio_gpu_object_shmem, base)
+#define to_virtio_gpu_vram(virtio_gpu_object) \
+ container_of((virtio_gpu_object), struct virtio_gpu_object_vram, base)
+
struct virtio_gpu_object_array {
struct ww_acquire_ctx ticket;
struct list_head next;
@@ -222,6 +232,7 @@ struct virtio_gpu_device {
bool has_resource_blob;
bool has_host_visible;
struct virtio_shm_region host_visible_region;
+ struct drm_mm host_visible_mm;
struct work_struct config_changed_work;
@@ -234,6 +245,7 @@ struct virtio_gpu_device {
struct list_head cap_cache;
spinlock_t resource_export_lock;
+ spinlock_t host_visible_lock;
};
struct virtio_gpu_fpriv {
@@ -364,6 +376,12 @@ int
virtio_gpu_cmd_resource_assign_uuid(struct virtio_gpu_device *vgdev,
struct virtio_gpu_object_array *objs);
+int virtio_gpu_cmd_map(struct virtio_gpu_device *vgdev,
+ struct virtio_gpu_object_array *objs, uint64_t offset);
+
+void virtio_gpu_cmd_unmap(struct virtio_gpu_device *vgdev,
+ struct virtio_gpu_object *bo);
+
/* virtgpu_display.c */
void virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev);
void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev);
@@ -410,4 +428,9 @@ struct drm_gem_object *virtgpu_gem_prime_import_sg_table(
/* virtgpu_debugfs.c */
void virtio_gpu_debugfs_init(struct drm_minor *minor);
+/* virtgpu_vram.c */
+bool virtio_gpu_is_vram(struct virtio_gpu_object *bo);
+int virtio_gpu_vram_create(struct virtio_gpu_device *vgdev,
+ struct virtio_gpu_object_params *params,
+ struct virtio_gpu_object **bo_ptr);
#endif
diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
index d3641eda7077..b1454c9d00e2 100644
--- a/drivers/gpu/drm/virtio/virtgpu_kms.c
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -119,6 +119,7 @@ int virtio_gpu_init(struct drm_device *dev)
spin_lock_init(&vgdev->display_info_lock);
spin_lock_init(&vgdev->resource_export_lock);
+ spin_lock_init(&vgdev->host_visible_lock);
ida_init(&vgdev->ctx_id_ida);
ida_init(&vgdev->resource_ida);
init_waitqueue_head(&vgdev->resp_wq);
@@ -167,6 +168,9 @@ int virtio_gpu_init(struct drm_device *dev)
(unsigned long)vgdev->host_visible_region.addr,
(unsigned long)vgdev->host_visible_region.len);
vgdev->has_host_visible = true;
+ drm_mm_init(&vgdev->host_visible_mm,
+ (unsigned long)vgdev->host_visible_region.addr,
+ (unsigned long)vgdev->host_visible_region.len);
}
DRM_INFO("features: %cvirgl %cedid %cresource_blob %chost_visible\n",
@@ -256,6 +260,10 @@ void virtio_gpu_release(struct drm_device *dev)
virtio_gpu_modeset_fini(vgdev);
virtio_gpu_free_vbufs(vgdev);
virtio_gpu_cleanup_cap_cache(vgdev);
+
+ if (vgdev->has_host_visible)
+ drm_mm_takedown(&vgdev->host_visible_mm);
+
kfree(vgdev->capsets);
if (vgdev->has_host_visible) {
diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c
index 792a2ae1bf97..432b9985ef2e 100644
--- a/drivers/gpu/drm/virtio/virtgpu_object.c
+++ b/drivers/gpu/drm/virtio/virtgpu_object.c
@@ -83,6 +83,18 @@ void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo)
}
drm_gem_shmem_free_object(&bo->base.base);
+ } else if (virtio_gpu_is_vram(bo)) {
+ struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
+
+ spin_lock(&vgdev->host_visible_lock);
+ if (drm_mm_node_allocated(&vram->vram_node))
+ drm_mm_remove_node(&vram->vram_node);
+
+ spin_unlock(&vgdev->host_visible_lock);
+
+ drm_gem_free_mmap_offset(&vram->base.base.base);
+ drm_gem_object_release(&vram->base.base.base);
+ kfree(vram);
}
}
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 3f225a08ecf3..09db56c69424 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -1162,3 +1162,69 @@ virtio_gpu_cmd_resource_assign_uuid(struct virtio_gpu_device *vgdev,
virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
return 0;
}
+
+static void virtio_gpu_cmd_resource_map_cb(struct virtio_gpu_device *vgdev,
+ struct virtio_gpu_vbuffer *vbuf)
+{
+ struct virtio_gpu_object *bo =
+ gem_to_virtio_gpu_obj(vbuf->objs->objs[0]);
+ struct virtio_gpu_resp_map_info *resp =
+ (struct virtio_gpu_resp_map_info *)vbuf->resp_buf;
+ struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
+ uint32_t resp_type = le32_to_cpu(resp->hdr.type);
+
+ spin_lock(&vgdev->host_visible_lock);
+
+ if (resp_type == VIRTIO_GPU_RESP_OK_MAP_INFO) {
+ vram->map_info = resp->map_info;
+ vram->map_state = STATE_OK;
+ } else {
+ vram->map_state = STATE_ERR;
+ }
+
+ spin_unlock(&vgdev->host_visible_lock);
+ wake_up_all(&vgdev->resp_wq);
+}
+
+int virtio_gpu_cmd_map(struct virtio_gpu_device *vgdev,
+ struct virtio_gpu_object_array *objs, uint64_t offset)
+{
+ struct virtio_gpu_resource_map_blob *cmd_p;
+ struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(objs->objs[0]);
+ struct virtio_gpu_vbuffer *vbuf;
+ struct virtio_gpu_resp_map_info *resp_buf;
+
+ resp_buf = kzalloc(sizeof(*resp_buf), GFP_KERNEL);
+ if (!resp_buf) {
+ virtio_gpu_array_put_free(objs);
+ return -ENOMEM;
+ }
+
+ cmd_p = virtio_gpu_alloc_cmd_resp(vgdev,
+ virtio_gpu_cmd_resource_map_cb, &vbuf, sizeof(*cmd_p),
+ sizeof(struct virtio_gpu_resp_map_info), resp_buf);
+ memset(cmd_p, 0, sizeof(*cmd_p));
+
+ cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_RESOURCE_MAP_BLOB);
+ cmd_p->resource_id = cpu_to_le32(bo->hw_res_handle);
+ cmd_p->offset = offset;
+ vbuf->objs = objs;
+
+ virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+ return 0;
+}
+
+void virtio_gpu_cmd_unmap(struct virtio_gpu_device *vgdev,
+ struct virtio_gpu_object *bo)
+{
+ struct virtio_gpu_resource_unmap_blob *cmd_p;
+ struct virtio_gpu_vbuffer *vbuf;
+
+ cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p));
+ memset(cmd_p, 0, sizeof(*cmd_p));
+
+ cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_RESOURCE_UNMAP_BLOB);
+ cmd_p->resource_id = cpu_to_le32(bo->hw_res_handle);
+
+ virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+}
diff --git a/drivers/gpu/drm/virtio/virtgpu_vram.c b/drivers/gpu/drm/virtio/virtgpu_vram.c
new file mode 100644
index 000000000000..3e7e29e56781
--- /dev/null
+++ b/drivers/gpu/drm/virtio/virtgpu_vram.c
@@ -0,0 +1,162 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "virtgpu_drv.h"
+
+static void virtio_gpu_vram_free(struct drm_gem_object *obj)
+{
+ struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
+ struct virtio_gpu_device *vgdev = obj->dev->dev_private;
+ struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
+ bool unmap;
+
+ if (bo->created) {
+ spin_lock(&vgdev->host_visible_lock);
+ unmap = drm_mm_node_allocated(&vram->vram_node);
+ spin_unlock(&vgdev->host_visible_lock);
+
+ if (unmap)
+ virtio_gpu_cmd_unmap(vgdev, bo);
+
+ virtio_gpu_cmd_unref_resource(vgdev, bo);
+ virtio_gpu_notify(vgdev);
+ return;
+ }
+}
+
+static const struct vm_operations_struct virtio_gpu_vram_vm_ops = {
+ .open = drm_gem_vm_open,
+ .close = drm_gem_vm_close,
+};
+
+static int virtio_gpu_vram_mmap(struct drm_gem_object *obj,
+ struct vm_area_struct *vma)
+{
+ int ret;
+ struct virtio_gpu_device *vgdev = obj->dev->dev_private;
+ struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
+ struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
+ unsigned long vm_size = vma->vm_end - vma->vm_start;
+
+ if (!(bo->blob_flags & VIRTGPU_BLOB_FLAG_USE_MAPPABLE))
+ return -EINVAL;
+
+ wait_event(vgdev->resp_wq, vram->map_state != STATE_INITIALIZING);
+ if (vram->map_state != STATE_OK)
+ return -EINVAL;
+
+ vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
+ vma->vm_flags |= VM_MIXEDMAP | VM_DONTEXPAND;
+ vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+ vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
+ vma->vm_ops = &virtio_gpu_vram_vm_ops;
+
+ if (vram->map_info == VIRTIO_GPU_MAP_CACHE_WC)
+ vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
+ else if (vram->map_info == VIRTIO_GPU_MAP_CACHE_UNCACHED)
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+ /* Partial mappings of GEM buffers don't happen much in practice. */
+ if (vm_size != vram->vram_node.size)
+ return -EINVAL;
+
+ ret = io_remap_pfn_range(vma, vma->vm_start,
+ vram->vram_node.start >> PAGE_SHIFT,
+ vm_size, vma->vm_page_prot);
+ return ret;
+}
+
+static const struct drm_gem_object_funcs virtio_gpu_vram_funcs = {
+ .open = virtio_gpu_gem_object_open,
+ .close = virtio_gpu_gem_object_close,
+ .free = virtio_gpu_vram_free,
+ .mmap = virtio_gpu_vram_mmap,
+};
+
+bool virtio_gpu_is_vram(struct virtio_gpu_object *bo)
+{
+ return bo->base.base.funcs == &virtio_gpu_vram_funcs;
+}
+
+static int virtio_gpu_vram_map(struct virtio_gpu_object *bo)
+{
+ int ret;
+ uint64_t offset;
+ struct virtio_gpu_object_array *objs;
+ struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
+ struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
+
+ if (!vgdev->has_host_visible)
+ return -EINVAL;
+
+ spin_lock(&vgdev->host_visible_lock);
+ ret = drm_mm_insert_node(&vgdev->host_visible_mm, &vram->vram_node,
+ bo->base.base.size);
+ spin_unlock(&vgdev->host_visible_lock);
+
+ if (ret)
+ return ret;
+
+ objs = virtio_gpu_array_alloc(1);
+ if (!objs) {
+ ret = -ENOMEM;
+ goto err_remove_node;
+ }
+
+ virtio_gpu_array_add_obj(objs, &bo->base.base);
+ /*TODO: Add an error checking helper function in drm_mm.h */
+ offset = vram->vram_node.start - vgdev->host_visible_region.addr;
+
+ ret = virtio_gpu_cmd_map(vgdev, objs, offset);
+ if (ret) {
+ virtio_gpu_array_put_free(objs);
+ goto err_remove_node;
+ }
+
+ return 0;
+
+err_remove_node:
+ spin_lock(&vgdev->host_visible_lock);
+ drm_mm_remove_node(&vram->vram_node);
+ spin_unlock(&vgdev->host_visible_lock);
+ return ret;
+}
+
+int virtio_gpu_vram_create(struct virtio_gpu_device *vgdev,
+ struct virtio_gpu_object_params *params,
+ struct virtio_gpu_object **bo_ptr)
+{
+ struct drm_gem_object *obj;
+ struct virtio_gpu_object_vram *vram;
+ int ret;
+
+ vram = kzalloc(sizeof(*vram), GFP_KERNEL);
+ if (!vram)
+ return -ENOMEM;
+
+ obj = &vram->base.base.base;
+ obj->funcs = &virtio_gpu_vram_funcs;
+ drm_gem_private_object_init(vgdev->ddev, obj, params->size);
+
+ /* Create fake offset */
+ ret = drm_gem_create_mmap_offset(obj);
+ if (ret) {
+ kfree(vram);
+ return ret;
+ }
+
+ ret = virtio_gpu_resource_id_get(vgdev, &vram->base.hw_res_handle);
+ if (ret) {
+ kfree(vram);
+ return ret;
+ }
+
+ if (params->blob_flags & VIRTGPU_BLOB_FLAG_USE_MAPPABLE) {
+ ret = virtio_gpu_vram_map(&vram->base);
+ if (ret) {
+ virtio_gpu_vram_free(obj);
+ return ret;
+ }
+ }
+
+ *bo_ptr = &vram->base;
+ return 0;
+}
--
2.24.1
More information about the dri-devel
mailing list