Subversion Repositories Kolibri OS

/**************************************************************************

 *

 * 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.

 *

 **************************************************************************/

#define mb()    asm volatile("mfence" : : : "memory")

#define rmb()   asm volatile("lfence" : : : "memory")

#define wmb()   asm volatile("sfence" : : : "memory")

#include "vmwgfx_drv.h"

#include 

#include 

#define TASK_INTERRUPTIBLE      1

#define TASK_UNINTERRUPTIBLE    2

bool vmw_fifo_have_3d(struct vmw_private *dev_priv)

{

	__le32 __iomem *fifo_mem = dev_priv->mmio_virt;

	uint32_t fifo_min, hwversion;

	const struct vmw_fifo_state *fifo = &dev_priv->fifo;

	if (!(dev_priv->capabilities & SVGA_CAP_3D))

		return false;

	if (dev_priv->capabilities & SVGA_CAP_GBOBJECTS) {

		uint32_t result;

		if (!dev_priv->has_mob)

			return false;

		mutex_lock(&dev_priv->hw_mutex);

		vmw_write(dev_priv, SVGA_REG_DEV_CAP, SVGA3D_DEVCAP_3D);

		result = vmw_read(dev_priv, SVGA_REG_DEV_CAP);

		mutex_unlock(&dev_priv->hw_mutex);

		return (result != 0);

	}

	if (!(dev_priv->capabilities & SVGA_CAP_EXTENDED_FIFO))

		return false;

	fifo_min = ioread32(fifo_mem  + SVGA_FIFO_MIN);

	if (fifo_min <= SVGA_FIFO_3D_HWVERSION * sizeof(unsigned int))

		return false;

	hwversion = ioread32(fifo_mem +

			     ((fifo->capabilities &

			       SVGA_FIFO_CAP_3D_HWVERSION_REVISED) ?

			      SVGA_FIFO_3D_HWVERSION_REVISED :

			      SVGA_FIFO_3D_HWVERSION));

	if (hwversion == 0)

		return false;

	if (hwversion < SVGA3D_HWVERSION_WS8_B1)

		return false;

	/* Non-Screen Object path does not support surfaces */

	if (!dev_priv->sou_priv)

		return false;

	return true;

}

bool vmw_fifo_have_pitchlock(struct vmw_private *dev_priv)

{

	__le32 __iomem *fifo_mem = dev_priv->mmio_virt;

	uint32_t caps;

	if (!(dev_priv->capabilities & SVGA_CAP_EXTENDED_FIFO))

		return false;

	caps = ioread32(fifo_mem + SVGA_FIFO_CAPABILITIES);

	if (caps & SVGA_FIFO_CAP_PITCHLOCK)

		return true;

	return false;

}

int vmw_fifo_init(struct vmw_private *dev_priv, struct vmw_fifo_state *fifo)

{

	__le32 __iomem *fifo_mem = dev_priv->mmio_virt;

	uint32_t max;

	uint32_t min;

	uint32_t dummy;

    ENTER();

	fifo->static_buffer_size = VMWGFX_FIFO_STATIC_SIZE;

    fifo->static_buffer = KernelAlloc(fifo->static_buffer_size);

	if (unlikely(fifo->static_buffer == NULL))

		return -ENOMEM;

	fifo->dynamic_buffer = NULL;

	fifo->reserved_size = 0;

	fifo->using_bounce_buffer = false;

	mutex_init(&fifo->fifo_mutex);

//   init_rwsem(&fifo->rwsem);

	/*

	 * Allow mapping the first page read-only to user-space.

	 */

	DRM_INFO("width %d\n", vmw_read(dev_priv, SVGA_REG_WIDTH));

	DRM_INFO("height %d\n", vmw_read(dev_priv, SVGA_REG_HEIGHT));

	DRM_INFO("bpp %d\n", vmw_read(dev_priv, SVGA_REG_BITS_PER_PIXEL));

	mutex_lock(&dev_priv->hw_mutex);

	dev_priv->enable_state = vmw_read(dev_priv, SVGA_REG_ENABLE);

	dev_priv->config_done_state = vmw_read(dev_priv, SVGA_REG_CONFIG_DONE);

	dev_priv->traces_state = vmw_read(dev_priv, SVGA_REG_TRACES);

	vmw_write(dev_priv, SVGA_REG_ENABLE, 1);

	min = 4;

	if (dev_priv->capabilities & SVGA_CAP_EXTENDED_FIFO)

		min = vmw_read(dev_priv, SVGA_REG_MEM_REGS);

	min <<= 2;

	if (min < PAGE_SIZE)

		min = PAGE_SIZE;

	iowrite32(min, fifo_mem + SVGA_FIFO_MIN);

	iowrite32(dev_priv->mmio_size, fifo_mem + SVGA_FIFO_MAX);

    wmb();

	iowrite32(min,  fifo_mem + SVGA_FIFO_NEXT_CMD);

	iowrite32(min,  fifo_mem + SVGA_FIFO_STOP);

	iowrite32(0, fifo_mem + SVGA_FIFO_BUSY);

    mb();

    vmw_write(dev_priv, SVGA_REG_CONFIG_DONE, 1);

	mutex_unlock(&dev_priv->hw_mutex);

	max = ioread32(fifo_mem + SVGA_FIFO_MAX);

	min = ioread32(fifo_mem  + SVGA_FIFO_MIN);

	fifo->capabilities = ioread32(fifo_mem + SVGA_FIFO_CAPABILITIES);

	DRM_INFO("Fifo max 0x%08x min 0x%08x cap 0x%08x\n",

		 (unsigned int) max,

		 (unsigned int) min,

		 (unsigned int) fifo->capabilities);

	atomic_set(&dev_priv->marker_seq, dev_priv->last_read_seqno);

	iowrite32(dev_priv->last_read_seqno, fifo_mem + SVGA_FIFO_FENCE);

    vmw_marker_queue_init(&fifo->marker_queue);

    int ret = 0; //vmw_fifo_send_fence(dev_priv, &dummy);

    LEAVE();

    return ret;

}

void vmw_fifo_ping_host(struct vmw_private *dev_priv, uint32_t reason)

{

	__le32 __iomem *fifo_mem = dev_priv->mmio_virt;

	mutex_lock(&dev_priv->hw_mutex);

	if (unlikely(ioread32(fifo_mem + SVGA_FIFO_BUSY) == 0)) {

		iowrite32(1, fifo_mem + SVGA_FIFO_BUSY);

		vmw_write(dev_priv, SVGA_REG_SYNC, reason);

	}

	mutex_unlock(&dev_priv->hw_mutex);

}

void vmw_fifo_release(struct vmw_private *dev_priv, struct vmw_fifo_state *fifo)

{

	__le32 __iomem *fifo_mem = dev_priv->mmio_virt;

	mutex_lock(&dev_priv->hw_mutex);

	while (vmw_read(dev_priv, SVGA_REG_BUSY) != 0)

		vmw_write(dev_priv, SVGA_REG_SYNC, SVGA_SYNC_GENERIC);

	dev_priv->last_read_seqno = ioread32(fifo_mem + SVGA_FIFO_FENCE);

	vmw_write(dev_priv, SVGA_REG_CONFIG_DONE,

		  dev_priv->config_done_state);

	vmw_write(dev_priv, SVGA_REG_ENABLE,

		  dev_priv->enable_state);

	vmw_write(dev_priv, SVGA_REG_TRACES,

		  dev_priv->traces_state);

	mutex_unlock(&dev_priv->hw_mutex);

	vmw_marker_queue_takedown(&fifo->marker_queue);

	if (likely(fifo->static_buffer != NULL)) {

		vfree(fifo->static_buffer);

		fifo->static_buffer = NULL;

	}

	if (likely(fifo->dynamic_buffer != NULL)) {

		vfree(fifo->dynamic_buffer);

		fifo->dynamic_buffer = NULL;

	}

}

static bool vmw_fifo_is_full(struct vmw_private *dev_priv, uint32_t bytes)

{

	__le32 __iomem *fifo_mem = dev_priv->mmio_virt;

	uint32_t max = ioread32(fifo_mem + SVGA_FIFO_MAX);

	uint32_t next_cmd = ioread32(fifo_mem + SVGA_FIFO_NEXT_CMD);

	uint32_t min = ioread32(fifo_mem + SVGA_FIFO_MIN);

	uint32_t stop = ioread32(fifo_mem + SVGA_FIFO_STOP);

	return ((max - next_cmd) + (stop - min) <= bytes);

}

static int vmw_fifo_wait_noirq(struct vmw_private *dev_priv,

			       uint32_t bytes, bool interruptible,

			       unsigned long timeout)

{

	int ret = 0;

    unsigned long end_jiffies = GetTimerTicks() + timeout;

//	DEFINE_WAIT(__wait);

	DRM_INFO("Fifo wait noirq.\n");

	for (;;) {

//       prepare_to_wait(&dev_priv->fifo_queue, &__wait,

//               (interruptible) ?

//               TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);

		if (!vmw_fifo_is_full(dev_priv, bytes))

			break;

        if (time_after_eq(GetTimerTicks(), end_jiffies)) {

			ret = -EBUSY;

			DRM_ERROR("SVGA device lockup.\n");

			break;

		}

        delay(1);

	}

//   finish_wait(&dev_priv->fifo_queue, &__wait);

	wake_up_all(&dev_priv->fifo_queue);

	DRM_INFO("Fifo noirq exit.\n");

	return ret;

}

static int vmw_fifo_wait(struct vmw_private *dev_priv,

			 uint32_t bytes, bool interruptible,

			 unsigned long timeout)

{

	long ret = 1L;

	unsigned long irq_flags;

	if (likely(!vmw_fifo_is_full(dev_priv, bytes)))

		return 0;

	vmw_fifo_ping_host(dev_priv, SVGA_SYNC_FIFOFULL);

	if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))

		return vmw_fifo_wait_noirq(dev_priv, bytes,

					   interruptible, timeout);

	mutex_lock(&dev_priv->hw_mutex);

	if (atomic_add_return(1, &dev_priv->fifo_queue_waiters) > 0) {

		spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);

		outl(SVGA_IRQFLAG_FIFO_PROGRESS,

		     dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);

		dev_priv->irq_mask |= SVGA_IRQFLAG_FIFO_PROGRESS;

		vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);

		spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);

	}

	mutex_unlock(&dev_priv->hw_mutex);

	if (interruptible)

		ret = wait_event_interruptible_timeout

		    (dev_priv->fifo_queue,

		     !vmw_fifo_is_full(dev_priv, bytes), timeout);

	else

		ret = wait_event_timeout

		    (dev_priv->fifo_queue,

		     !vmw_fifo_is_full(dev_priv, bytes), timeout);

	if (unlikely(ret == 0))

		ret = -EBUSY;

	else if (likely(ret > 0))

		ret = 0;

	mutex_lock(&dev_priv->hw_mutex);

	if (atomic_dec_and_test(&dev_priv->fifo_queue_waiters)) {

		spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);

		dev_priv->irq_mask &= ~SVGA_IRQFLAG_FIFO_PROGRESS;

		vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);

		spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);

	}

	mutex_unlock(&dev_priv->hw_mutex);

	return ret;

}

/**

 * Reserve @bytes number of bytes in the fifo.

 *

 * This function will return NULL (error) on two conditions:

 *  If it timeouts waiting for fifo space, or if @bytes is larger than the

 *   available fifo space.

 *

 * Returns:

 *   Pointer to the fifo, or null on error (possible hardware hang).

 */

void *vmw_fifo_reserve(struct vmw_private *dev_priv, uint32_t bytes)

{

	struct vmw_fifo_state *fifo_state = &dev_priv->fifo;

	__le32 __iomem *fifo_mem = dev_priv->mmio_virt;

	uint32_t max;

	uint32_t min;

	uint32_t next_cmd;

	uint32_t reserveable = fifo_state->capabilities & SVGA_FIFO_CAP_RESERVE;

	int ret;

	mutex_lock(&fifo_state->fifo_mutex);

	max = ioread32(fifo_mem + SVGA_FIFO_MAX);

	min = ioread32(fifo_mem + SVGA_FIFO_MIN);

	next_cmd = ioread32(fifo_mem + SVGA_FIFO_NEXT_CMD);

	if (unlikely(bytes >= (max - min)))

		goto out_err;

	BUG_ON(fifo_state->reserved_size != 0);

	BUG_ON(fifo_state->dynamic_buffer != NULL);

	fifo_state->reserved_size = bytes;

	while (1) {

		uint32_t stop = ioread32(fifo_mem + SVGA_FIFO_STOP);

		bool need_bounce = false;

		bool reserve_in_place = false;

		if (next_cmd >= stop) {

			if (likely((next_cmd + bytes < max ||

				    (next_cmd + bytes == max && stop > min))))

				reserve_in_place = true;

			else if (vmw_fifo_is_full(dev_priv, bytes)) {

				ret = vmw_fifo_wait(dev_priv, bytes,

						    false, 3 * HZ);

				if (unlikely(ret != 0))

					goto out_err;

			} else

				need_bounce = true;

		} else {

			if (likely((next_cmd + bytes < stop)))

				reserve_in_place = true;

			else {

				ret = vmw_fifo_wait(dev_priv, bytes,

						    false, 3 * HZ);

				if (unlikely(ret != 0))

					goto out_err;

			}

		}

		if (reserve_in_place) {

			if (reserveable || bytes <= sizeof(uint32_t)) {

				fifo_state->using_bounce_buffer = false;

				if (reserveable)

					iowrite32(bytes, fifo_mem +

						  SVGA_FIFO_RESERVED);

				return fifo_mem + (next_cmd >> 2);

			} else {

				need_bounce = true;

			}

		}

		if (need_bounce) {

			fifo_state->using_bounce_buffer = true;

			if (bytes < fifo_state->static_buffer_size)

				return fifo_state->static_buffer;

			else {

                fifo_state->dynamic_buffer = kmalloc(bytes,0);

				return fifo_state->dynamic_buffer;

			}

		}

	}

out_err:

	fifo_state->reserved_size = 0;

	mutex_unlock(&fifo_state->fifo_mutex);

	return NULL;

}

static void vmw_fifo_res_copy(struct vmw_fifo_state *fifo_state,

			      __le32 __iomem *fifo_mem,

			      uint32_t next_cmd,

			      uint32_t max, uint32_t min, uint32_t bytes)

{

	uint32_t chunk_size = max - next_cmd;

	uint32_t rest;

	uint32_t *buffer = (fifo_state->dynamic_buffer != NULL) ?

	    fifo_state->dynamic_buffer : fifo_state->static_buffer;

ENTER();

	if (bytes < chunk_size)

		chunk_size = bytes;

	iowrite32(bytes, fifo_mem + SVGA_FIFO_RESERVED);

    mb();

    memcpy(fifo_mem + (next_cmd >> 2), buffer, chunk_size);

	rest = bytes - chunk_size;

	if (rest)

        memcpy(fifo_mem + (min >> 2), buffer + (chunk_size >> 2),

			    rest);

LEAVE();

}

static void vmw_fifo_slow_copy(struct vmw_fifo_state *fifo_state,

			       __le32 __iomem *fifo_mem,

			       uint32_t next_cmd,

			       uint32_t max, uint32_t min, uint32_t bytes)

{

	uint32_t *buffer = (fifo_state->dynamic_buffer != NULL) ?

	    fifo_state->dynamic_buffer : fifo_state->static_buffer;

ENTER();

	while (bytes > 0) {

		iowrite32(*buffer++, fifo_mem + (next_cmd >> 2));

		next_cmd += sizeof(uint32_t);

		if (unlikely(next_cmd == max))

			next_cmd = min;

		mb();

		iowrite32(next_cmd, fifo_mem + SVGA_FIFO_NEXT_CMD);

		mb();

		bytes -= sizeof(uint32_t);

	}

LEAVE();

}

void vmw_fifo_commit(struct vmw_private *dev_priv, uint32_t bytes)

{

	struct vmw_fifo_state *fifo_state = &dev_priv->fifo;

	__le32 __iomem *fifo_mem = dev_priv->mmio_virt;

	uint32_t next_cmd = ioread32(fifo_mem + SVGA_FIFO_NEXT_CMD);

	uint32_t max = ioread32(fifo_mem + SVGA_FIFO_MAX);

	uint32_t min = ioread32(fifo_mem + SVGA_FIFO_MIN);

	bool reserveable = fifo_state->capabilities & SVGA_FIFO_CAP_RESERVE;

//    ENTER();

	BUG_ON((bytes & 3) != 0);

	BUG_ON(bytes > fifo_state->reserved_size);

	fifo_state->reserved_size = 0;

	if (fifo_state->using_bounce_buffer) {

		if (reserveable)

			vmw_fifo_res_copy(fifo_state, fifo_mem,

					  next_cmd, max, min, bytes);

		else

			vmw_fifo_slow_copy(fifo_state, fifo_mem,

					   next_cmd, max, min, bytes);

		if (fifo_state->dynamic_buffer) {

			vfree(fifo_state->dynamic_buffer);

			fifo_state->dynamic_buffer = NULL;

		}

	}

//   down_write(&fifo_state->rwsem);

	if (fifo_state->using_bounce_buffer || reserveable) {

		next_cmd += bytes;

		if (next_cmd >= max)

			next_cmd -= max - min;

		mb();

		iowrite32(next_cmd, fifo_mem + SVGA_FIFO_NEXT_CMD);

	}

	if (reserveable)

		iowrite32(0, fifo_mem + SVGA_FIFO_RESERVED);

    mb();

//   up_write(&fifo_state->rwsem);

	vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);

	mutex_unlock(&fifo_state->fifo_mutex);

//    LEAVE();

}

int vmw_fifo_send_fence(struct vmw_private *dev_priv, uint32_t *seqno)

{

	struct vmw_fifo_state *fifo_state = &dev_priv->fifo;

	struct svga_fifo_cmd_fence *cmd_fence;

	void *fm;

	int ret = 0;

	uint32_t bytes = sizeof(__le32) + sizeof(*cmd_fence);

	fm = vmw_fifo_reserve(dev_priv, bytes);

	if (unlikely(fm == NULL)) {

		*seqno = atomic_read(&dev_priv->marker_seq);

		ret = -ENOMEM;

		(void)vmw_fallback_wait(dev_priv, false, true, *seqno,

					false, 3*HZ);

		goto out_err;

	}

	do {

		*seqno = atomic_add_return(1, &dev_priv->marker_seq);

	} while (*seqno == 0);

	if (!(fifo_state->capabilities & SVGA_FIFO_CAP_FENCE)) {

		/*

		 * Don't request hardware to send a fence. The

		 * waiting code in vmwgfx_irq.c will emulate this.

		 */

		vmw_fifo_commit(dev_priv, 0);

		return 0;

	}

	*(__le32 *) fm = cpu_to_le32(SVGA_CMD_FENCE);

	cmd_fence = (struct svga_fifo_cmd_fence *)

	    ((unsigned long)fm + sizeof(__le32));

	iowrite32(*seqno, &cmd_fence->fence);

	vmw_fifo_commit(dev_priv, bytes);

	(void) vmw_marker_push(&fifo_state->marker_queue, *seqno);

	vmw_update_seqno(dev_priv, fifo_state);

out_err:

	return ret;

}

/**

 * vmw_fifo_emit_dummy_legacy_query - emits a dummy query to the fifo using

 * legacy query commands.

 *

 * @dev_priv: The device private structure.

 * @cid: The hardware context id used for the query.

 *

 * See the vmw_fifo_emit_dummy_query documentation.

 */

static int vmw_fifo_emit_dummy_legacy_query(struct vmw_private *dev_priv,

			      uint32_t cid)

{

	/*

	 * A query wait without a preceding query end will

	 * actually finish all queries for this cid

	 * without writing to the query result structure.

	 */

	struct ttm_buffer_object *bo = dev_priv->dummy_query_bo;

	struct {

		SVGA3dCmdHeader header;

		SVGA3dCmdWaitForQuery body;

	} *cmd;

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));

	if (unlikely(cmd == NULL)) {

		DRM_ERROR("Out of fifo space for dummy query.\n");

		return -ENOMEM;

	}

	cmd->header.id = SVGA_3D_CMD_WAIT_FOR_QUERY;

	cmd->header.size = sizeof(cmd->body);

	cmd->body.cid = cid;

	cmd->body.type = SVGA3D_QUERYTYPE_OCCLUSION;

	if (bo->mem.mem_type == TTM_PL_VRAM) {

		cmd->body.guestResult.gmrId = SVGA_GMR_FRAMEBUFFER;

		cmd->body.guestResult.offset = bo->offset;

	} else {

		cmd->body.guestResult.gmrId = bo->mem.start;

		cmd->body.guestResult.offset = 0;

	}

	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	return 0;

}

/**

 * vmw_fifo_emit_dummy_gb_query - emits a dummy query to the fifo using

 * guest-backed resource query commands.

 *

 * @dev_priv: The device private structure.

 * @cid: The hardware context id used for the query.

 *

 * See the vmw_fifo_emit_dummy_query documentation.

 */

static int vmw_fifo_emit_dummy_gb_query(struct vmw_private *dev_priv,

					uint32_t cid)

{

	/*

	 * A query wait without a preceding query end will

	 * actually finish all queries for this cid

	 * without writing to the query result structure.

	 */

	struct ttm_buffer_object *bo = dev_priv->dummy_query_bo;

	struct {

		SVGA3dCmdHeader header;

		SVGA3dCmdWaitForGBQuery body;

	} *cmd;

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));

	if (unlikely(cmd == NULL)) {

		DRM_ERROR("Out of fifo space for dummy query.\n");

		return -ENOMEM;

	}

	cmd->header.id = SVGA_3D_CMD_WAIT_FOR_GB_QUERY;

	cmd->header.size = sizeof(cmd->body);

	cmd->body.cid = cid;

	cmd->body.type = SVGA3D_QUERYTYPE_OCCLUSION;

	BUG_ON(bo->mem.mem_type != VMW_PL_MOB);

	cmd->body.mobid = bo->mem.start;

	cmd->body.offset = 0;

	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	return 0;

}

/**

 * vmw_fifo_emit_dummy_gb_query - emits a dummy query to the fifo using

 * appropriate resource query commands.

 *

 * @dev_priv: The device private structure.

 * @cid: The hardware context id used for the query.

 *

 * This function is used to emit a dummy occlusion query with

 * no primitives rendered between query begin and query end.

 * It's used to provide a query barrier, in order to know that when

 * this query is finished, all preceding queries are also finished.

 *

 * A Query results structure should have been initialized at the start

 * of the dev_priv->dummy_query_bo buffer object. And that buffer object

 * must also be either reserved or pinned when this function is called.

 *

 * Returns -ENOMEM on failure to reserve fifo space.

 */

int vmw_fifo_emit_dummy_query(struct vmw_private *dev_priv,

			      uint32_t cid)

{

	if (dev_priv->has_mob)

		return vmw_fifo_emit_dummy_gb_query(dev_priv, cid);

	return vmw_fifo_emit_dummy_legacy_query(dev_priv, cid);

}