savage_state.c

来自「底层驱动开发」· C语言 代码 · 共 1,147 行 · 第 1/3 页

			 * shading while preserving the clock sense
			 * for correct culling. Only on Savage3D. */
			int reorder[3] = {2, -1, -1};

			BEGIN_DMA(count*vtx_size+1);
			DMA_DRAW_PRIMITIVE(count, prim, skip);

			for (i = 0; i < count; ++i) {
				unsigned int j = idx[i + reorder[i % 3]];
				DMA_COPY_FROM_USER(&vtxbuf[vb_stride*j],
						   vtx_size);
			}

			DMA_COMMIT();
		} else {
			BEGIN_DMA(count*vtx_size+1);
			DMA_DRAW_PRIMITIVE(count, prim, skip);

			for (i = 0; i < count; ++i) {
				unsigned int j = idx[i];
				DMA_COPY_FROM_USER(&vtxbuf[vb_stride*j],
						   vtx_size);
			}

			DMA_COMMIT();
		}

		usr_idx += count;
		n -= count;

		prim |= BCI_CMD_DRAW_CONT;
	}

	return 0;
}

static int savage_dispatch_clear(drm_savage_private_t *dev_priv,
				 const drm_savage_cmd_header_t *cmd_header,
				 const drm_savage_cmd_header_t __user *data,
				 unsigned int nbox,
				 const drm_clip_rect_t __user *usr_boxes)
{
	unsigned int flags = cmd_header->clear0.flags, mask, value;
	unsigned int clear_cmd;
	unsigned int i, nbufs;
	DMA_LOCALS;

	if (nbox == 0)
		return 0;

	DRM_GET_USER_UNCHECKED(mask, &((const drm_savage_cmd_header_t*)data)
			       ->clear1.mask);
	DRM_GET_USER_UNCHECKED(value, &((const drm_savage_cmd_header_t*)data)
			       ->clear1.value);

	clear_cmd = BCI_CMD_RECT | BCI_CMD_RECT_XP | BCI_CMD_RECT_YP |
		BCI_CMD_SEND_COLOR | BCI_CMD_DEST_PBD_NEW;
	BCI_CMD_SET_ROP(clear_cmd,0xCC);

	nbufs = ((flags & SAVAGE_FRONT) ? 1 : 0) +
		((flags & SAVAGE_BACK) ? 1 : 0) +
		((flags & SAVAGE_DEPTH) ? 1 : 0);
	if (nbufs == 0)
		return 0;

	if (mask != 0xffffffff) {
		/* set mask */
		BEGIN_DMA(2);
		DMA_SET_REGISTERS(SAVAGE_BITPLANEWTMASK, 1);
		DMA_WRITE(mask);
		DMA_COMMIT();
	}
	for (i = 0; i < nbox; ++i) {
		drm_clip_rect_t box;
		unsigned int x, y, w, h;
		unsigned int buf;
		DRM_COPY_FROM_USER_UNCHECKED(&box, &usr_boxes[i], sizeof(box));
		x = box.x1, y = box.y1;
		w = box.x2 - box.x1;
		h = box.y2 - box.y1;
		BEGIN_DMA(nbufs*6);
		for (buf = SAVAGE_FRONT; buf <= SAVAGE_DEPTH; buf <<= 1) {
			if (!(flags & buf))
				continue;
			DMA_WRITE(clear_cmd);
			switch(buf) {
			case SAVAGE_FRONT:
				DMA_WRITE(dev_priv->front_offset);
				DMA_WRITE(dev_priv->front_bd);
				break;
			case SAVAGE_BACK:
				DMA_WRITE(dev_priv->back_offset);
				DMA_WRITE(dev_priv->back_bd);
				break;
			case SAVAGE_DEPTH:
				DMA_WRITE(dev_priv->depth_offset);
				DMA_WRITE(dev_priv->depth_bd);
				break;
			}
			DMA_WRITE(value);
			DMA_WRITE(BCI_X_Y(x, y));
			DMA_WRITE(BCI_W_H(w, h));
		}
		DMA_COMMIT();
	}
	if (mask != 0xffffffff) {
		/* reset mask */
		BEGIN_DMA(2);
		DMA_SET_REGISTERS(SAVAGE_BITPLANEWTMASK, 1);
		DMA_WRITE(0xffffffff);
		DMA_COMMIT();
	}

	return 0;
}

static int savage_dispatch_swap(drm_savage_private_t *dev_priv,
				unsigned int nbox,
				const drm_clip_rect_t __user *usr_boxes)
{
	unsigned int swap_cmd;
	unsigned int i;
	DMA_LOCALS;

	if (nbox == 0)
		return 0;

	swap_cmd = BCI_CMD_RECT | BCI_CMD_RECT_XP | BCI_CMD_RECT_YP |
		BCI_CMD_SRC_PBD_COLOR_NEW | BCI_CMD_DEST_GBD;
	BCI_CMD_SET_ROP(swap_cmd,0xCC);

	for (i = 0; i < nbox; ++i) {
		drm_clip_rect_t box;
		DRM_COPY_FROM_USER_UNCHECKED(&box, &usr_boxes[i], sizeof(box));

		BEGIN_DMA(6);
		DMA_WRITE(swap_cmd);
		DMA_WRITE(dev_priv->back_offset);
		DMA_WRITE(dev_priv->back_bd);
		DMA_WRITE(BCI_X_Y(box.x1, box.y1));
		DMA_WRITE(BCI_X_Y(box.x1, box.y1));
		DMA_WRITE(BCI_W_H(box.x2-box.x1, box.y2-box.y1));
		DMA_COMMIT();
	}

	return 0;
}

static int savage_dispatch_draw(drm_savage_private_t *dev_priv,
				const drm_savage_cmd_header_t __user *start,
				const drm_savage_cmd_header_t __user *end,
				const drm_buf_t *dmabuf,
				const unsigned int __user *usr_vtxbuf,
				unsigned int vb_size, unsigned int vb_stride,
				unsigned int nbox,
				const drm_clip_rect_t __user *usr_boxes)
{
	unsigned int i, j;
	int ret;

	for (i = 0; i < nbox; ++i) {
		drm_clip_rect_t box;
		const drm_savage_cmd_header_t __user *usr_cmdbuf;
		DRM_COPY_FROM_USER_UNCHECKED(&box, &usr_boxes[i], sizeof(box));
		dev_priv->emit_clip_rect(dev_priv, &box);

		usr_cmdbuf = start;
		while (usr_cmdbuf < end) {
			drm_savage_cmd_header_t cmd_header;
			DRM_COPY_FROM_USER_UNCHECKED(&cmd_header, usr_cmdbuf,
						     sizeof(cmd_header));
			usr_cmdbuf++;
			switch (cmd_header.cmd.cmd) {
			case SAVAGE_CMD_DMA_PRIM:
				ret = savage_dispatch_dma_prim(
					dev_priv, &cmd_header, dmabuf);
				break;
			case SAVAGE_CMD_VB_PRIM:
				ret = savage_dispatch_vb_prim(
					dev_priv, &cmd_header,
					(const uint32_t __user *)usr_vtxbuf,
					vb_size, vb_stride);
				break;
			case SAVAGE_CMD_DMA_IDX:
				j = (cmd_header.idx.count + 3) / 4;
				/* j was check in savage_bci_cmdbuf */
				ret = savage_dispatch_dma_idx(
					dev_priv, &cmd_header,
					(const uint16_t __user *)usr_cmdbuf,
					dmabuf);
				usr_cmdbuf += j;
				break;
			case SAVAGE_CMD_VB_IDX:
				j = (cmd_header.idx.count + 3) / 4;
				/* j was check in savage_bci_cmdbuf */
				ret = savage_dispatch_vb_idx(
					dev_priv, &cmd_header,
					(const uint16_t __user *)usr_cmdbuf,
					(const uint32_t __user *)usr_vtxbuf,
					vb_size, vb_stride);
				usr_cmdbuf += j;
				break;
			default:
				/* What's the best return code? EFAULT? */
				DRM_ERROR("IMPLEMENTATION ERROR: "
					  "non-drawing-command %d\n",
					  cmd_header.cmd.cmd);
				return DRM_ERR(EINVAL);
			}

			if (ret != 0)
				return ret;
		}
	}

	return 0;
}

int savage_bci_cmdbuf(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_savage_private_t *dev_priv = dev->dev_private;
	drm_device_dma_t *dma = dev->dma;
	drm_buf_t *dmabuf;
	drm_savage_cmdbuf_t cmdbuf;
	drm_savage_cmd_header_t __user *usr_cmdbuf;
	drm_savage_cmd_header_t __user *first_draw_cmd;
	unsigned int __user *usr_vtxbuf;
	drm_clip_rect_t __user *usr_boxes;
	unsigned int i, j;
	int ret = 0;

	DRM_DEBUG("\n");
	
	LOCK_TEST_WITH_RETURN(dev, filp);

	DRM_COPY_FROM_USER_IOCTL(cmdbuf, (drm_savage_cmdbuf_t __user *)data,
				 sizeof(cmdbuf));

	if (dma && dma->buflist) {
		if (cmdbuf.dma_idx > dma->buf_count) {
			DRM_ERROR("vertex buffer index %u out of range (0-%u)\n",
				  cmdbuf.dma_idx, dma->buf_count-1);
			return DRM_ERR(EINVAL);
		}
		dmabuf = dma->buflist[cmdbuf.dma_idx];
	} else {
		dmabuf = NULL;
	}

	usr_cmdbuf = (drm_savage_cmd_header_t __user *)cmdbuf.cmd_addr;
	usr_vtxbuf = (unsigned int __user *)cmdbuf.vb_addr;
	usr_boxes = (drm_clip_rect_t __user *)cmdbuf.box_addr;
	if ((cmdbuf.size && DRM_VERIFYAREA_READ(usr_cmdbuf, cmdbuf.size*8)) ||
	    (cmdbuf.vb_size && DRM_VERIFYAREA_READ(
		    usr_vtxbuf, cmdbuf.vb_size)) ||
	    (cmdbuf.nbox && DRM_VERIFYAREA_READ(
		    usr_boxes, cmdbuf.nbox*sizeof(drm_clip_rect_t))))
		return DRM_ERR(EFAULT);

	/* Make sure writes to DMA buffers are finished before sending
	 * DMA commands to the graphics hardware. */
	DRM_MEMORYBARRIER();

	/* Coming from user space. Don't know if the Xserver has
	 * emitted wait commands. Assuming the worst. */
	dev_priv->waiting = 1;

	i = 0;
	first_draw_cmd = NULL;
	while (i < cmdbuf.size) {
		drm_savage_cmd_header_t cmd_header;
		DRM_COPY_FROM_USER_UNCHECKED(&cmd_header, usr_cmdbuf,
					     sizeof(cmd_header));
		usr_cmdbuf++;
		i++;

		/* Group drawing commands with same state to minimize
		 * iterations over clip rects. */
		j = 0;
		switch (cmd_header.cmd.cmd) {
		case SAVAGE_CMD_DMA_IDX:
		case SAVAGE_CMD_VB_IDX:
			j = (cmd_header.idx.count + 3) / 4;
			if (i + j > cmdbuf.size) {
				DRM_ERROR("indexed drawing command extends "
					  "beyond end of command buffer\n");
				DMA_FLUSH();
				return DRM_ERR(EINVAL);
			}
			/* fall through */
		case SAVAGE_CMD_DMA_PRIM:
		case SAVAGE_CMD_VB_PRIM:
			if (!first_draw_cmd)
				first_draw_cmd = usr_cmdbuf-1;
			usr_cmdbuf += j;
			i += j;
			break;
		default:
			if (first_draw_cmd) {
				ret = savage_dispatch_draw (
					dev_priv, first_draw_cmd, usr_cmdbuf-1,
					dmabuf, usr_vtxbuf, cmdbuf.vb_size,
					cmdbuf.vb_stride,
					cmdbuf.nbox, usr_boxes);
				if (ret != 0)
					return ret;
				first_draw_cmd = NULL;
			}
		}
		if (first_draw_cmd)
			continue;

		switch (cmd_header.cmd.cmd) {
		case SAVAGE_CMD_STATE:
			j = (cmd_header.state.count + 1) / 2;
			if (i + j > cmdbuf.size) {
				DRM_ERROR("command SAVAGE_CMD_STATE extends "
					  "beyond end of command buffer\n");
				DMA_FLUSH();
				return DRM_ERR(EINVAL);
			}
			ret = savage_dispatch_state(
				dev_priv, &cmd_header,
				(uint32_t __user *)usr_cmdbuf);
			usr_cmdbuf += j;
			i += j;
			break;
		case SAVAGE_CMD_CLEAR:
			if (i + 1 > cmdbuf.size) {
				DRM_ERROR("command SAVAGE_CMD_CLEAR extends "
					  "beyond end of command buffer\n");
				DMA_FLUSH();
				return DRM_ERR(EINVAL);
			}
			ret = savage_dispatch_clear(dev_priv, &cmd_header,
						    usr_cmdbuf,
						    cmdbuf.nbox, usr_boxes);
			usr_cmdbuf++;
			i++;
			break;
		case SAVAGE_CMD_SWAP:
			ret = savage_dispatch_swap(dev_priv,
						   cmdbuf.nbox, usr_boxes);
			break;
		default:
			DRM_ERROR("invalid command 0x%x\n", cmd_header.cmd.cmd);
			DMA_FLUSH();
			return DRM_ERR(EINVAL);
		}

		if (ret != 0) {
			DMA_FLUSH();
			return ret;
		}
	}

	if (first_draw_cmd) {
		ret = savage_dispatch_draw (
			dev_priv, first_draw_cmd, usr_cmdbuf, dmabuf,
			usr_vtxbuf, cmdbuf.vb_size, cmdbuf.vb_stride,
			cmdbuf.nbox, usr_boxes);
		if (ret != 0) {
			DMA_FLUSH();
			return ret;
		}
	}

	DMA_FLUSH();

	if (dmabuf && cmdbuf.discard) {
		drm_savage_buf_priv_t *buf_priv = dmabuf->dev_private;
		uint16_t event;
		event = savage_bci_emit_event(dev_priv, SAVAGE_WAIT_3D);
		SET_AGE(&buf_priv->age, event, dev_priv->event_wrap);
		savage_freelist_put(dev, dmabuf);
	}

	return 0;
}