drm/vmwgfx: Add DRM driver for VMware Virtual GPU

This commit adds the vmwgfx driver for the VWware Virtual GPU aka SVGA.
The driver is under staging the same as Nouveau and Radeon KMS. Hopefully
the 2D ioctls are bug free and don't need changing, so that part of the
API should be stable. But there there is a pretty big chance that the 3D API
will change in the future.

Signed-off-by: Thomas Hellström <thellstrom@vmware.com>
Signed-off-by: Jakob Bornecrantz <jakob@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 516 insertions, 0 deletions

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
new file mode 100644
index 00000000000..7a39f3e6dc2
--- /dev/null
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -0,0 +1,516 @@
+/**************************************************************************
+ *
+ * Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+#include "vmwgfx_drv.h"
+#include "vmwgfx_reg.h"
+#include "ttm/ttm_bo_api.h"
+#include "ttm/ttm_placement.h"
+
+static int vmw_cmd_invalid(struct vmw_private *dev_priv,
+			   struct vmw_sw_context *sw_context,
+			   SVGA3dCmdHeader *header)
+{
+	return capable(CAP_SYS_ADMIN) ? : -EINVAL;
+}
+
+static int vmw_cmd_ok(struct vmw_private *dev_priv,
+		      struct vmw_sw_context *sw_context,
+		      SVGA3dCmdHeader *header)
+{
+	return 0;
+}
+
+static int vmw_cmd_cid_check(struct vmw_private *dev_priv,
+			     struct vmw_sw_context *sw_context,
+			     SVGA3dCmdHeader *header)
+{
+	struct vmw_cid_cmd {
+		SVGA3dCmdHeader header;
+		__le32 cid;
+	} *cmd;
+	int ret;
+
+	cmd = container_of(header, struct vmw_cid_cmd, header);
+	if (likely(sw_context->cid_valid && cmd->cid == sw_context->last_cid))
+		return 0;
+
+	ret = vmw_context_check(dev_priv, sw_context->tfile, cmd->cid);
+	if (unlikely(ret != 0)) {
+		DRM_ERROR("Could not find or use context %u\n",
+			  (unsigned) cmd->cid);
+		return ret;
+	}
+
+	sw_context->last_cid = cmd->cid;
+	sw_context->cid_valid = true;
+
+	return 0;
+}
+
+static int vmw_cmd_sid_check(struct vmw_private *dev_priv,
+			     struct vmw_sw_context *sw_context,
+			     uint32_t sid)
+{
+	if (unlikely((!sw_context->sid_valid || sid != sw_context->last_sid) &&
+		     sid != SVGA3D_INVALID_ID)) {
+		int ret = vmw_surface_check(dev_priv, sw_context->tfile, sid);
+
+		if (unlikely(ret != 0)) {
+			DRM_ERROR("Could ot find or use surface %u\n",
+				  (unsigned) sid);
+			return ret;
+		}
+
+		sw_context->last_sid = sid;
+		sw_context->sid_valid = true;
+	}
+	return 0;
+}
+
+
+static int vmw_cmd_set_render_target_check(struct vmw_private *dev_priv,
+					   struct vmw_sw_context *sw_context,
+					   SVGA3dCmdHeader *header)
+{
+	struct vmw_sid_cmd {
+		SVGA3dCmdHeader header;
+		SVGA3dCmdSetRenderTarget body;
+	} *cmd;
+	int ret;
+
+	ret = vmw_cmd_cid_check(dev_priv, sw_context, header);
+	if (unlikely(ret != 0))
+		return ret;
+
+	cmd = container_of(header, struct vmw_sid_cmd, header);
+	return vmw_cmd_sid_check(dev_priv, sw_context, cmd->body.target.sid);
+}
+
+static int vmw_cmd_surface_copy_check(struct vmw_private *dev_priv,
+				      struct vmw_sw_context *sw_context,
+				      SVGA3dCmdHeader *header)
+{
+	struct vmw_sid_cmd {
+		SVGA3dCmdHeader header;
+		SVGA3dCmdSurfaceCopy body;
+	} *cmd;
+	int ret;
+
+	cmd = container_of(header, struct vmw_sid_cmd, header);
+	ret = vmw_cmd_sid_check(dev_priv, sw_context, cmd->body.src.sid);
+	if (unlikely(ret != 0))
+		return ret;
+	return vmw_cmd_sid_check(dev_priv, sw_context, cmd->body.dest.sid);
+}
+
+static int vmw_cmd_stretch_blt_check(struct vmw_private *dev_priv,
+				     struct vmw_sw_context *sw_context,
+				     SVGA3dCmdHeader *header)
+{
+	struct vmw_sid_cmd {
+		SVGA3dCmdHeader header;
+		SVGA3dCmdSurfaceStretchBlt body;
+	} *cmd;
+	int ret;
+
+	cmd = container_of(header, struct vmw_sid_cmd, header);
+	ret = vmw_cmd_sid_check(dev_priv, sw_context, cmd->body.src.sid);
+	if (unlikely(ret != 0))
+		return ret;
+	return vmw_cmd_sid_check(dev_priv, sw_context, cmd->body.dest.sid);
+}
+
+static int vmw_cmd_blt_surf_screen_check(struct vmw_private *dev_priv,
+					 struct vmw_sw_context *sw_context,
+					 SVGA3dCmdHeader *header)
+{
+	struct vmw_sid_cmd {
+		SVGA3dCmdHeader header;
+		SVGA3dCmdBlitSurfaceToScreen body;
+	} *cmd;
+
+	cmd = container_of(header, struct vmw_sid_cmd, header);
+	return vmw_cmd_sid_check(dev_priv, sw_context, cmd->body.srcImage.sid);
+}
+
+static int vmw_cmd_present_check(struct vmw_private *dev_priv,
+				 struct vmw_sw_context *sw_context,
+				 SVGA3dCmdHeader *header)
+{
+	struct vmw_sid_cmd {
+		SVGA3dCmdHeader header;
+		SVGA3dCmdPresent body;
+	} *cmd;
+
+	cmd = container_of(header, struct vmw_sid_cmd, header);
+	return vmw_cmd_sid_check(dev_priv, sw_context, cmd->body.sid);
+}
+
+static int vmw_cmd_dma(struct vmw_private *dev_priv,
+		       struct vmw_sw_context *sw_context,
+		       SVGA3dCmdHeader *header)
+{
+	uint32_t handle;
+	struct vmw_dma_buffer *vmw_bo = NULL;
+	struct ttm_buffer_object *bo;
+	struct vmw_surface *srf = NULL;
+	struct vmw_dma_cmd {
+		SVGA3dCmdHeader header;
+		SVGA3dCmdSurfaceDMA dma;
+	} *cmd;
+	struct vmw_relocation *reloc;
+	int ret;
+	uint32_t cur_validate_node;
+	struct ttm_validate_buffer *val_buf;
+
+
+	cmd = container_of(header, struct vmw_dma_cmd, header);
+	ret = vmw_cmd_sid_check(dev_priv, sw_context, cmd->dma.host.sid);
+	if (unlikely(ret != 0))
+		return ret;
+
+	handle = cmd->dma.guest.ptr.gmrId;
+	ret = vmw_user_dmabuf_lookup(sw_context->tfile, handle, &vmw_bo);
+	if (unlikely(ret != 0)) {
+		DRM_ERROR("Could not find or use GMR region.\n");
+		return -EINVAL;
+	}
+	bo = &vmw_bo->base;
+
+	if (unlikely(sw_context->cur_reloc >= VMWGFX_MAX_RELOCATIONS)) {
+		DRM_ERROR("Max number of DMA commands per submission"
+			  " exceeded\n");
+		ret = -EINVAL;
+		goto out_no_reloc;
+	}
+
+	reloc = &sw_context->relocs[sw_context->cur_reloc++];
+	reloc->location = &cmd->dma.guest.ptr;
+
+	cur_validate_node = vmw_dmabuf_validate_node(bo, sw_context->cur_val_buf);
+	if (unlikely(cur_validate_node >= VMWGFX_MAX_GMRS)) {
+		DRM_ERROR("Max number of DMA buffers per submission"
+			  " exceeded.\n");
+		ret = -EINVAL;
+		goto out_no_reloc;
+	}
+
+	reloc->index = cur_validate_node;
+	if (unlikely(cur_validate_node == sw_context->cur_val_buf)) {
+		val_buf = &sw_context->val_bufs[cur_validate_node];
+		val_buf->bo = ttm_bo_reference(bo);
+		val_buf->new_sync_obj_arg = (void *) dev_priv;
+		list_add_tail(&val_buf->head, &sw_context->validate_nodes);
+		++sw_context->cur_val_buf;
+	}
+
+	ret = vmw_user_surface_lookup(dev_priv, sw_context->tfile,
+				      cmd->dma.host.sid, &srf);
+	if (ret) {
+		DRM_ERROR("could not find surface\n");
+		goto out_no_reloc;
+	}
+
+	vmw_kms_cursor_snoop(srf, sw_context->tfile, bo, header);
+	vmw_surface_unreference(&srf);
+
+out_no_reloc:
+	vmw_dmabuf_unreference(&vmw_bo);
+	return ret;
+}
+
+
+typedef int (*vmw_cmd_func) (struct vmw_private *,
+			     struct vmw_sw_context *,
+			     SVGA3dCmdHeader *);
+
+#define VMW_CMD_DEF(cmd, func) \
+	[cmd - SVGA_3D_CMD_BASE] = func
+
+static vmw_cmd_func vmw_cmd_funcs[SVGA_3D_CMD_MAX] = {
+	VMW_CMD_DEF(SVGA_3D_CMD_SURFACE_DEFINE, &vmw_cmd_invalid),
+	VMW_CMD_DEF(SVGA_3D_CMD_SURFACE_DESTROY, &vmw_cmd_invalid),
+	VMW_CMD_DEF(SVGA_3D_CMD_SURFACE_COPY, &vmw_cmd_surface_copy_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_SURFACE_STRETCHBLT, &vmw_cmd_stretch_blt_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_SURFACE_DMA, &vmw_cmd_dma),
+	VMW_CMD_DEF(SVGA_3D_CMD_CONTEXT_DEFINE, &vmw_cmd_invalid),
+	VMW_CMD_DEF(SVGA_3D_CMD_CONTEXT_DESTROY, &vmw_cmd_invalid),
+	VMW_CMD_DEF(SVGA_3D_CMD_SETTRANSFORM, &vmw_cmd_cid_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_SETZRANGE, &vmw_cmd_cid_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_SETRENDERSTATE, &vmw_cmd_cid_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_SETRENDERTARGET,
+		    &vmw_cmd_set_render_target_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_SETTEXTURESTATE, &vmw_cmd_cid_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_SETMATERIAL, &vmw_cmd_cid_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_SETLIGHTDATA, &vmw_cmd_cid_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_SETLIGHTENABLED, &vmw_cmd_cid_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_SETVIEWPORT, &vmw_cmd_cid_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_SETCLIPPLANE, &vmw_cmd_cid_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_CLEAR, &vmw_cmd_cid_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_PRESENT, &vmw_cmd_present_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_SHADER_DEFINE, &vmw_cmd_cid_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_SHADER_DESTROY, &vmw_cmd_cid_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_SET_SHADER, &vmw_cmd_cid_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_SET_SHADER_CONST, &vmw_cmd_cid_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_DRAW_PRIMITIVES, &vmw_cmd_cid_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_SETSCISSORRECT, &vmw_cmd_cid_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_BEGIN_QUERY, &vmw_cmd_cid_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_END_QUERY, &vmw_cmd_cid_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_WAIT_FOR_QUERY, &vmw_cmd_cid_check),
+	VMW_CMD_DEF(SVGA_3D_CMD_PRESENT_READBACK, &vmw_cmd_ok),
+	VMW_CMD_DEF(SVGA_3D_CMD_BLIT_SURFACE_TO_SCREEN,
+		    &vmw_cmd_blt_surf_screen_check)
+};
+
+static int vmw_cmd_check(struct vmw_private *dev_priv,
+			 struct vmw_sw_context *sw_context,
+			 void *buf, uint32_t *size)
+{
+	uint32_t cmd_id;
+	SVGA3dCmdHeader *header = (SVGA3dCmdHeader *) buf;
+	int ret;
+
+	cmd_id = ((uint32_t *)buf)[0];
+	if (cmd_id == SVGA_CMD_UPDATE) {
+		*size = 5 << 2;
+		return 0;
+	}
+
+	cmd_id = le32_to_cpu(header->id);
+	*size = le32_to_cpu(header->size) + sizeof(SVGA3dCmdHeader);
+
+	cmd_id -= SVGA_3D_CMD_BASE;
+	if (unlikely(cmd_id >= SVGA_3D_CMD_MAX - SVGA_3D_CMD_BASE))
+		goto out_err;
+
+	ret = vmw_cmd_funcs[cmd_id](dev_priv, sw_context, header);
+	if (unlikely(ret != 0))
+		goto out_err;
+
+	return 0;
+out_err:
+	DRM_ERROR("Illegal / Invalid SVGA3D command: %d\n",
+		  cmd_id + SVGA_3D_CMD_BASE);
+	return -EINVAL;
+}
+
+static int vmw_cmd_check_all(struct vmw_private *dev_priv,
+			     struct vmw_sw_context *sw_context,
+			     void *buf, uint32_t size)
+{
+	int32_t cur_size = size;
+	int ret;
+
+	while (cur_size > 0) {
+		ret = vmw_cmd_check(dev_priv, sw_context, buf, &size);
+		if (unlikely(ret != 0))
+			return ret;
+		buf = (void *)((unsigned long) buf + size);
+		cur_size -= size;
+	}
+
+	if (unlikely(cur_size != 0)) {
+		DRM_ERROR("Command verifier out of sync.\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void vmw_free_relocations(struct vmw_sw_context *sw_context)
+{
+	sw_context->cur_reloc = 0;
+}
+
+static void vmw_apply_relocations(struct vmw_sw_context *sw_context)
+{
+	uint32_t i;
+	struct vmw_relocation *reloc;
+	struct ttm_validate_buffer *validate;
+	struct ttm_buffer_object *bo;
+
+	for (i = 0; i < sw_context->cur_reloc; ++i) {
+		reloc = &sw_context->relocs[i];
+		validate = &sw_context->val_bufs[reloc->index];
+		bo = validate->bo;
+		reloc->location->offset += bo->offset;
+		reloc->location->gmrId = vmw_dmabuf_gmr(bo);
+	}
+	vmw_free_relocations(sw_context);
+}
+
+static void vmw_clear_validations(struct vmw_sw_context *sw_context)
+{
+	struct ttm_validate_buffer *entry, *next;
+
+	list_for_each_entry_safe(entry, next, &sw_context->validate_nodes,
+				 head) {
+		list_del(&entry->head);
+		vmw_dmabuf_validate_clear(entry->bo);
+		ttm_bo_unref(&entry->bo);
+		sw_context->cur_val_buf--;
+	}
+	BUG_ON(sw_context->cur_val_buf != 0);
+}
+
+static int vmw_validate_single_buffer(struct vmw_private *dev_priv,
+				      struct ttm_buffer_object *bo)
+{
+	int ret;
+
+	if (vmw_dmabuf_gmr(bo) != SVGA_GMR_NULL)
+		return 0;
+
+	ret = vmw_gmr_bind(dev_priv, bo);
+	if (likely(ret == 0 || ret == -ERESTART))
+		return ret;
+
+
+	ret = ttm_bo_validate(bo, &vmw_vram_placement, true, false);
+	return ret;
+}
+
+
+static int vmw_validate_buffers(struct vmw_private *dev_priv,
+				struct vmw_sw_context *sw_context)
+{
+	struct ttm_validate_buffer *entry;
+	int ret;
+
+	list_for_each_entry(entry, &sw_context->validate_nodes, head) {
+		ret = vmw_validate_single_buffer(dev_priv, entry->bo);
+		if (unlikely(ret != 0))
+			return ret;
+	}
+	return 0;
+}
+
+int vmw_execbuf_ioctl(struct drm_device *dev, void *data,
+		      struct drm_file *file_priv)
+{
+	struct vmw_private *dev_priv = vmw_priv(dev);
+	struct drm_vmw_execbuf_arg *arg = (struct drm_vmw_execbuf_arg *)data;
+	struct drm_vmw_fence_rep fence_rep;
+	struct drm_vmw_fence_rep __user *user_fence_rep;
+	int ret;
+	void *user_cmd;
+	void *cmd;
+	uint32_t sequence;
+	struct vmw_sw_context *sw_context = &dev_priv->ctx;
+	struct vmw_master *vmaster = vmw_master(file_priv->master);
+
+	ret = ttm_read_lock(&vmaster->lock, true);
+	if (unlikely(ret != 0))
+		return ret;
+
+	ret = mutex_lock_interruptible(&dev_priv->cmdbuf_mutex);
+	if (unlikely(ret != 0)) {
+		ret = -ERESTART;
+		goto out_no_cmd_mutex;
+	}
+
+	cmd = vmw_fifo_reserve(dev_priv, arg->command_size);
+	if (unlikely(cmd == NULL)) {
+		DRM_ERROR("Failed reserving fifo space for commands.\n");
+		ret = -ENOMEM;
+		goto out_unlock;
+	}
+
+	user_cmd = (void __user *)(unsigned long)arg->commands;
+	ret = copy_from_user(cmd, user_cmd, arg->command_size);
+
+	if (unlikely(ret != 0)) {
+		DRM_ERROR("Failed copying commands.\n");
+		goto out_commit;
+	}
+
+	sw_context->tfile = vmw_fpriv(file_priv)->tfile;
+	sw_context->cid_valid = false;
+	sw_context->sid_valid = false;
+	sw_context->cur_reloc = 0;
+	sw_context->cur_val_buf = 0;
+
+	INIT_LIST_HEAD(&sw_context->validate_nodes);
+
+	ret = vmw_cmd_check_all(dev_priv, sw_context, cmd, arg->command_size);
+	if (unlikely(ret != 0))
+		goto out_err;
+	ret = ttm_eu_reserve_buffers(&sw_context->validate_nodes,
+				     dev_priv->val_seq++);
+	if (unlikely(ret != 0))
+		goto out_err;
+
+	ret = vmw_validate_buffers(dev_priv, sw_context);
+	if (unlikely(ret != 0))
+		goto out_err;
+
+	vmw_apply_relocations(sw_context);
+	vmw_fifo_commit(dev_priv, arg->command_size);
+
+	ret = vmw_fifo_send_fence(dev_priv, &sequence);
+
+	ttm_eu_fence_buffer_objects(&sw_context->validate_nodes,
+				    (void *)(unsigned long) sequence);
+	vmw_clear_validations(sw_context);
+	mutex_unlock(&dev_priv->cmdbuf_mutex);
+
+	/*
+	 * This error is harmless, because if fence submission fails,
+	 * vmw_fifo_send_fence will sync.
+	 */
+
+	if (ret != 0)
+		DRM_ERROR("Fence submission error. Syncing.\n");
+
+	fence_rep.error = ret;
+	fence_rep.fence_seq = (uint64_t) sequence;
+
+	user_fence_rep = (struct drm_vmw_fence_rep __user *)
+	    (unsigned long)arg->fence_rep;
+
+	/*
+	 * copy_to_user errors will be detected by user space not
+	 * seeing fence_rep::error filled in.
+	 */
+
+	ret = copy_to_user(user_fence_rep, &fence_rep, sizeof(fence_rep));
+
+	vmw_kms_cursor_post_execbuf(dev_priv);
+	ttm_read_unlock(&vmaster->lock);
+	return 0;
+out_err:
+	vmw_free_relocations(sw_context);
+	ttm_eu_backoff_reservation(&sw_context->validate_nodes);
+	vmw_clear_validations(sw_context);
+out_commit:
+	vmw_fifo_commit(dev_priv, 0);
+out_unlock:
+	mutex_unlock(&dev_priv->cmdbuf_mutex);
+out_no_cmd_mutex:
+	ttm_read_unlock(&vmaster->lock);
+	return ret;
+}