drivers/gpu/drm/vmwgfx/vmwgfx_drv.c

/**************************************************************************
 *
 * 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 "drmP.h"
#include "vmwgfx_drv.h"
#include "ttm/ttm_placement.h"
#include "ttm/ttm_bo_driver.h"
#include "ttm/ttm_object.h"
#include "ttm/ttm_module.h"

#define VMWGFX_DRIVER_NAME "vmwgfx"
#define VMWGFX_DRIVER_DESC "Linux drm driver for VMware graphics devices"
#define VMWGFX_CHIP_SVGAII 0
#define VMW_FB_RESERVATION 0

/**
 * Fully encoded drm commands. Might move to vmw_drm.h
 */

#define DRM_IOCTL_VMW_GET_PARAM					\
	DRM_IOWR(DRM_COMMAND_BASE + DRM_VMW_GET_PARAM,		\
		 struct drm_vmw_getparam_arg)
#define DRM_IOCTL_VMW_ALLOC_DMABUF				\
	DRM_IOWR(DRM_COMMAND_BASE + DRM_VMW_ALLOC_DMABUF,	\
		union drm_vmw_alloc_dmabuf_arg)
#define DRM_IOCTL_VMW_UNREF_DMABUF				\
	DRM_IOW(DRM_COMMAND_BASE + DRM_VMW_UNREF_DMABUF,	\
		struct drm_vmw_unref_dmabuf_arg)
#define DRM_IOCTL_VMW_CURSOR_BYPASS				\
	DRM_IOW(DRM_COMMAND_BASE + DRM_VMW_CURSOR_BYPASS,	\
		 struct drm_vmw_cursor_bypass_arg)

#define DRM_IOCTL_VMW_CONTROL_STREAM				\
	DRM_IOW(DRM_COMMAND_BASE + DRM_VMW_CONTROL_STREAM,	\
		 struct drm_vmw_control_stream_arg)
#define DRM_IOCTL_VMW_CLAIM_STREAM				\
	DRM_IOR(DRM_COMMAND_BASE + DRM_VMW_CLAIM_STREAM,	\
		 struct drm_vmw_stream_arg)
#define DRM_IOCTL_VMW_UNREF_STREAM				\
	DRM_IOW(DRM_COMMAND_BASE + DRM_VMW_UNREF_STREAM,	\
		 struct drm_vmw_stream_arg)

#define DRM_IOCTL_VMW_CREATE_CONTEXT				\
	DRM_IOR(DRM_COMMAND_BASE + DRM_VMW_CREATE_CONTEXT,	\
		struct drm_vmw_context_arg)
#define DRM_IOCTL_VMW_UNREF_CONTEXT				\
	DRM_IOW(DRM_COMMAND_BASE + DRM_VMW_UNREF_CONTEXT,	\
		struct drm_vmw_context_arg)
#define DRM_IOCTL_VMW_CREATE_SURFACE				\
	DRM_IOWR(DRM_COMMAND_BASE + DRM_VMW_CREATE_SURFACE,	\
		 union drm_vmw_surface_create_arg)
#define DRM_IOCTL_VMW_UNREF_SURFACE				\
	DRM_IOW(DRM_COMMAND_BASE + DRM_VMW_UNREF_SURFACE,	\
		 struct drm_vmw_surface_arg)
#define DRM_IOCTL_VMW_REF_SURFACE				\
	DRM_IOWR(DRM_COMMAND_BASE + DRM_VMW_REF_SURFACE,	\
		 union drm_vmw_surface_reference_arg)
#define DRM_IOCTL_VMW_EXECBUF					\
	DRM_IOW(DRM_COMMAND_BASE + DRM_VMW_EXECBUF,		\
		struct drm_vmw_execbuf_arg)
#define DRM_IOCTL_VMW_FIFO_DEBUG				\
	DRM_IOWR(DRM_COMMAND_BASE + DRM_VMW_FIFO_DEBUG,		\
		 struct drm_vmw_fifo_debug_arg)
#define DRM_IOCTL_VMW_FENCE_WAIT				\
	DRM_IOWR(DRM_COMMAND_BASE + DRM_VMW_FENCE_WAIT,		\
		 struct drm_vmw_fence_wait_arg)


/**
 * The core DRM version of this macro doesn't account for
 * DRM_COMMAND_BASE.
 */

#define VMW_IOCTL_DEF(ioctl, func, flags) \
	[DRM_IOCTL_NR(ioctl) - DRM_COMMAND_BASE] = {ioctl, flags, func}

/**
 * Ioctl definitions.
 */

static struct drm_ioctl_desc vmw_ioctls[] = {
	VMW_IOCTL_DEF(DRM_IOCTL_VMW_GET_PARAM, vmw_getparam_ioctl,
		      DRM_AUTH | DRM_UNLOCKED),
	VMW_IOCTL_DEF(DRM_IOCTL_VMW_ALLOC_DMABUF, vmw_dmabuf_alloc_ioctl,
		      DRM_AUTH | DRM_UNLOCKED),
	VMW_IOCTL_DEF(DRM_IOCTL_VMW_UNREF_DMABUF, vmw_dmabuf_unref_ioctl,
		      DRM_AUTH | DRM_UNLOCKED),
	VMW_IOCTL_DEF(DRM_IOCTL_VMW_CURSOR_BYPASS,
		      vmw_kms_cursor_bypass_ioctl,
		      DRM_MASTER | DRM_CONTROL_ALLOW | DRM_UNLOCKED),

	VMW_IOCTL_DEF(DRM_IOCTL_VMW_CONTROL_STREAM, vmw_overlay_ioctl,
		      DRM_MASTER | DRM_CONTROL_ALLOW | DRM_UNLOCKED),
	VMW_IOCTL_DEF(DRM_IOCTL_VMW_CLAIM_STREAM, vmw_stream_claim_ioctl,
		      DRM_MASTER | DRM_CONTROL_ALLOW | DRM_UNLOCKED),
	VMW_IOCTL_DEF(DRM_IOCTL_VMW_UNREF_STREAM, vmw_stream_unref_ioctl,
		      DRM_MASTER | DRM_CONTROL_ALLOW | DRM_UNLOCKED),

	VMW_IOCTL_DEF(DRM_IOCTL_VMW_CREATE_CONTEXT, vmw_context_define_ioctl,
		      DRM_AUTH | DRM_UNLOCKED),
	VMW_IOCTL_DEF(DRM_IOCTL_VMW_UNREF_CONTEXT, vmw_context_destroy_ioctl,
		      DRM_AUTH | DRM_UNLOCKED),
	VMW_IOCTL_DEF(DRM_IOCTL_VMW_CREATE_SURFACE, vmw_surface_define_ioctl,
		      DRM_AUTH | DRM_UNLOCKED),
	VMW_IOCTL_DEF(DRM_IOCTL_VMW_UNREF_SURFACE, vmw_surface_destroy_ioctl,
		      DRM_AUTH | DRM_UNLOCKED),
	VMW_IOCTL_DEF(DRM_IOCTL_VMW_REF_SURFACE, vmw_surface_reference_ioctl,
		      DRM_AUTH | DRM_UNLOCKED),
	VMW_IOCTL_DEF(DRM_IOCTL_VMW_EXECBUF, vmw_execbuf_ioctl,
		      DRM_AUTH | DRM_UNLOCKED),
	VMW_IOCTL_DEF(DRM_IOCTL_VMW_FIFO_DEBUG, vmw_fifo_debug_ioctl,
		      DRM_AUTH | DRM_ROOT_ONLY | DRM_MASTER | DRM_UNLOCKED),
	VMW_IOCTL_DEF(DRM_IOCTL_VMW_FENCE_WAIT, vmw_fence_wait_ioctl,
		      DRM_AUTH | DRM_UNLOCKED)
};

static struct pci_device_id vmw_pci_id_list[] = {
	{0x15ad, 0x0405, PCI_ANY_ID, PCI_ANY_ID, 0, 0, VMWGFX_CHIP_SVGAII},
	{0, 0, 0}
};

static char *vmw_devname = "vmwgfx";

static int vmw_probe(struct pci_dev *, const struct pci_device_id *);
static void vmw_master_init(struct vmw_master *);

static void vmw_print_capabilities(uint32_t capabilities)
{
	DRM_INFO("Capabilities:\n");
	if (capabilities & SVGA_CAP_RECT_COPY)
		DRM_INFO("  Rect copy.\n");
	if (capabilities & SVGA_CAP_CURSOR)
		DRM_INFO("  Cursor.\n");
	if (capabilities & SVGA_CAP_CURSOR_BYPASS)
		DRM_INFO("  Cursor bypass.\n");
	if (capabilities & SVGA_CAP_CURSOR_BYPASS_2)
		DRM_INFO("  Cursor bypass 2.\n");
	if (capabilities & SVGA_CAP_8BIT_EMULATION)
		DRM_INFO("  8bit emulation.\n");
	if (capabilities & SVGA_CAP_ALPHA_CURSOR)
		DRM_INFO("  Alpha cursor.\n");
	if (capabilities & SVGA_CAP_3D)
		DRM_INFO("  3D.\n");
	if (capabilities & SVGA_CAP_EXTENDED_FIFO)
		DRM_INFO("  Extended Fifo.\n");
	if (capabilities & SVGA_CAP_MULTIMON)
		DRM_INFO("  Multimon.\n");
	if (capabilities & SVGA_CAP_PITCHLOCK)
		DRM_INFO("  Pitchlock.\n");
	if (capabilities & SVGA_CAP_IRQMASK)
		DRM_INFO("  Irq mask.\n");
	if (capabilities & SVGA_CAP_DISPLAY_TOPOLOGY)
		DRM_INFO("  Display Topology.\n");
	if (capabilities & SVGA_CAP_GMR)
		DRM_INFO("  GMR.\n");
	if (capabilities & SVGA_CAP_TRACES)
		DRM_INFO("  Traces.\n");
}

static int vmw_request_device(struct vmw_private *dev_priv)
{
	int ret;

	vmw_kms_save_vga(dev_priv);

	ret = vmw_fifo_init(dev_priv, &dev_priv->fifo);
	if (unlikely(ret != 0)) {
		DRM_ERROR("Unable to initialize FIFO.\n");
		return ret;
	}

	return 0;
}

static void vmw_release_device(struct vmw_private *dev_priv)
{
	vmw_fifo_release(dev_priv, &dev_priv->fifo);
	vmw_kms_restore_vga(dev_priv);
}


static int vmw_driver_load(struct drm_device *dev, unsigned long chipset)
{
	struct vmw_private *dev_priv;
	int ret;

	dev_priv = kzalloc(sizeof(*dev_priv), GFP_KERNEL);
	if (unlikely(dev_priv == NULL)) {
		DRM_ERROR("Failed allocating a device private struct.\n");
		return -ENOMEM;
	}
	memset(dev_priv, 0, sizeof(*dev_priv));

	dev_priv->dev = dev;
	dev_priv->vmw_chipset = chipset;
	mutex_init(&dev_priv->hw_mutex);
	mutex_init(&dev_priv->cmdbuf_mutex);
	rwlock_init(&dev_priv->resource_lock);
	idr_init(&dev_priv->context_idr);
	idr_init(&dev_priv->surface_idr);
	idr_init(&dev_priv->stream_idr);
	ida_init(&dev_priv->gmr_ida);
	mutex_init(&dev_priv->init_mutex);
	init_waitqueue_head(&dev_priv->fence_queue);
	init_waitqueue_head(&dev_priv->fifo_queue);
	atomic_set(&dev_priv->fence_queue_waiters, 0);
	atomic_set(&dev_priv->fifo_queue_waiters, 0);
	INIT_LIST_HEAD(&dev_priv->gmr_lru);

	dev_priv->io_start = pci_resource_start(dev->pdev, 0);
	dev_priv->vram_start = pci_resource_start(dev->pdev, 1);
	dev_priv->mmio_start = pci_resource_start(dev->pdev, 2);

	mutex_lock(&dev_priv->hw_mutex);
	dev_priv->capabilities = vmw_read(dev_priv, SVGA_REG_CAPABILITIES);

	if (dev_priv->capabilities & SVGA_CAP_GMR) {
		dev_priv->max_gmr_descriptors =
			vmw_read(dev_priv,
				 SVGA_REG_GMR_MAX_DESCRIPTOR_LENGTH);
		dev_priv->max_gmr_ids =
			vmw_read(dev_priv, SVGA_REG_GMR_MAX_IDS);
	}

	dev_priv->vram_size = vmw_read(dev_priv, SVGA_REG_VRAM_SIZE);
	dev_priv->mmio_size = vmw_read(dev_priv, SVGA_REG_MEM_SIZE);
	dev_priv->fb_max_width = vmw_read(dev_priv, SVGA_REG_MAX_WIDTH);
	dev_priv->fb_max_height = vmw_read(dev_priv, SVGA_REG_MAX_HEIGHT);

	mutex_unlock(&dev_priv->hw_mutex);

	vmw_print_capabilities(dev_priv->capabilities);

	if (dev_priv->capabilities & SVGA_CAP_GMR) {
		DRM_INFO("Max GMR ids is %u\n",
			 (unsigned)dev_priv->max_gmr_ids);
		DRM_INFO("Max GMR descriptors is %u\n",
			 (unsigned)dev_priv->max_gmr_descriptors);
	}
	DRM_INFO("VRAM at 0x%08x size is %u kiB\n",
		 dev_priv->vram_start, dev_priv->vram_size / 1024);
	DRM_INFO("MMIO at 0x%08x size is %u kiB\n",
		 dev_priv->mmio_start, dev_priv->mmio_size / 1024);

	ret = vmw_ttm_global_init(dev_priv);
	if (unlikely(ret != 0))
		goto out_err0;


	vmw_master_init(&dev_priv->fbdev_master);
	ttm_lock_set_kill(&dev_priv->fbdev_master.lock, false, SIGTERM);
	dev_priv->active_master = &dev_priv->fbdev_master;


	ret = ttm_bo_device_init(&dev_priv->bdev,
				 dev_priv->bo_global_ref.ref.object,
				 &vmw_bo_driver, VMWGFX_FILE_PAGE_OFFSET,
				 false);
	if (unlikely(ret != 0)) {
		DRM_ERROR("Failed initializing TTM buffer object driver.\n");
		goto out_err1;
	}

	ret = ttm_bo_init_mm(&dev_priv->bdev, TTM_PL_VRAM,
			     (dev_priv->vram_size >> PAGE_SHIFT));
	if (unlikely(ret != 0)) {
		DRM_ERROR("Failed initializing memory manager for VRAM.\n");
		goto out_err2;
	}

	dev_priv->mmio_mtrr = drm_mtrr_add(dev_priv->mmio_start,
					   dev_priv->mmio_size, DRM_MTRR_WC);

	dev_priv->mmio_virt = ioremap_wc(dev_priv->mmio_start,
					 dev_priv->mmio_size);

	if (unlikely(dev_priv->mmio_virt == NULL)) {
		ret = -ENOMEM;
		DRM_ERROR("Failed mapping MMIO.\n");
		goto out_err3;
	}

	dev_priv->tdev = ttm_object_device_init
	    (dev_priv->mem_global_ref.object, 12);

	if (unlikely(dev_priv->tdev == NULL)) {
		DRM_ERROR("Unable to initialize TTM object management.\n");
		ret = -ENOMEM;
		goto out_err4;
	}

	dev->dev_private = dev_priv;

	if (!dev->devname)
		dev->devname = vmw_devname;

	if (dev_priv->capabilities & SVGA_CAP_IRQMASK) {
		ret = drm_irq_install(dev);
		if (unlikely(ret != 0)) {
			DRM_ERROR("Failed installing irq: %d\n", ret);
			goto out_no_irq;
		}
	}

	ret = pci_request_regions(dev->pdev, "vmwgfx probe");
	dev_priv->stealth = (ret != 0);
	if (dev_priv->stealth) {
		/**
		 * Request at least the mmio PCI resource.
		 */

		DRM_INFO("It appears like vesafb is loaded. "
			 "Ignore above error if any. Entering stealth mode.\n");
		ret = pci_request_region(dev->pdev, 2, "vmwgfx stealth probe");
		if (unlikely(ret != 0)) {
			DRM_ERROR("Failed reserving the SVGA MMIO resource.\n");
			goto out_no_device;
		}
		vmw_kms_init(dev_priv);
		vmw_overlay_init(dev_priv);
	} else {
		ret = vmw_request_device(dev_priv);
		if (unlikely(ret != 0))
			goto out_no_device;
		vmw_kms_init(dev_priv);
		vmw_overlay_init(dev_priv);
		vmw_fb_init(dev_priv);
	}

	return 0;

out_no_device:
	if (dev_priv->capabilities & SVGA_CAP_IRQMASK)
		drm_irq_uninstall(dev_priv->dev);
	if (dev->devname == vmw_devname)
		dev->devname = NULL;
out_no_irq:
	ttm_object_device_release(&dev_priv->tdev);
out_err4:
	iounmap(dev_priv->mmio_virt);
out_err3:
	drm_mtrr_del(dev_priv->mmio_mtrr, dev_priv->mmio_start,
		     dev_priv->mmio_size, DRM_MTRR_WC);
	(void)ttm_bo_clean_mm(&dev_priv->bdev, TTM_PL_VRAM);
out_err2:
	(void)ttm_bo_device_release(&dev_priv->bdev);
out_err1:
	vmw_ttm_global_release(dev_priv);
out_err0:
	ida_destroy(&dev_priv->gmr_ida);
	idr_destroy(&dev_priv->surface_idr);
	idr_destroy(&dev_priv->context_idr);
	idr_destroy(&dev_priv->stream_idr);
	kfree(dev_priv);
	return ret;
}

static int vmw_driver_unload(struct drm_device *dev)
{
	struct vmw_private *dev_priv = vmw_priv(dev);

	DRM_INFO(VMWGFX_DRIVER_NAME " unload.\n");

	if (!dev_priv->stealth) {
		vmw_fb_close(dev_priv);
		vmw_kms_close(dev_priv);
		vmw_overlay_close(dev_priv);
		vmw_release_device(dev_priv);
		pci_release_regions(dev->pdev);
	} else {
		vmw_kms_close(dev_priv);
		vmw_overlay_close(dev_priv);
		pci_release_region(dev->pdev, 2);
	}
	if (dev_priv->capabilities & SVGA_CAP_IRQMASK)
		drm_irq_uninstall(dev_priv->dev);
	if (dev->devname == vmw_devname)
		dev->devname = NULL;
	ttm_object_device_release(&dev_priv->tdev);
	iounmap(dev_priv->mmio_virt);
	drm_mtrr_del(dev_priv->mmio_mtrr, dev_priv->mmio_start,
		     dev_priv->mmio_size, DRM_MTRR_WC);
	(void)ttm_bo_clean_mm(&dev_priv->bdev, TTM_PL_VRAM);
	(void)ttm_bo_device_release(&dev_priv->bdev);
	vmw_ttm_global_release(dev_priv);
	ida_destroy(&dev_priv->gmr_ida);
	idr_destroy(&dev_priv->surface_idr);
	idr_destroy(&dev_priv->context_idr);
	idr_destroy(&dev_priv->stream_idr);

	kfree(dev_priv);

	return 0;
}

static void vmw_postclose(struct drm_device *dev,
			 struct drm_file *file_priv)
{
	struct vmw_fpriv *vmw_fp;

	vmw_fp = vmw_fpriv(file_priv);
	ttm_object_file_release(&vmw_fp->tfile);
	if (vmw_fp->locked_master)
		drm_master_put(&vmw_fp->locked_master);
	kfree(vmw_fp);
}

static int vmw_driver_open(struct drm_device *dev, struct drm_file *file_priv)
{
	struct vmw_private *dev_priv = vmw_priv(dev);
	struct vmw_fpriv *vmw_fp;
	int ret = -ENOMEM;

	vmw_fp = kzalloc(sizeof(*vmw_fp), GFP_KERNEL);
	if (unlikely(vmw_fp == NULL))
		return ret;

	vmw_fp->tfile = ttm_object_file_init(dev_priv->tdev, 10);
	if (unlikely(vmw_fp->tfile == NULL))
		goto out_no_tfile;

	file_priv->driver_priv = vmw_fp;

	if (unlikely(dev_priv->bdev.dev_mapping == NULL))
		dev_priv->bdev.dev_mapping =
			file_priv->filp->f_path.dentry->d_inode->i_mapping;

	return 0;

out_no_tfile:
	kfree(vmw_fp);
	return ret;
}

static long vmw_unlocked_ioctl(struct file *filp, unsigned int cmd,
			       unsigned long arg)
{
	struct drm_file *file_priv = filp->private_data;
	struct drm_device *dev = file_priv->minor->dev;
	unsigned int nr = DRM_IOCTL_NR(cmd);

	/*
	 * Do extra checking on driver private ioctls.
	 */

	if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END)
	    && (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) {
		struct drm_ioctl_desc *ioctl =
		    &vmw_ioctls[nr - DRM_COMMAND_BASE];

		if (unlikely(ioctl->cmd != cmd)) {
			DRM_ERROR("Invalid command format, ioctl %d\n",
				  nr - DRM_COMMAND_BASE);
			return -EINVAL;
		}
	}

	return drm_ioctl(filp, cmd, arg);
}

static int vmw_firstopen(struct drm_device *dev)
{
	struct vmw_private *dev_priv = vmw_priv(dev);
	dev_priv->is_opened = true;

	return 0;
}

static void vmw_lastclose(struct drm_device *dev)
{
	struct vmw_private *dev_priv = vmw_priv(dev);
	struct drm_crtc *crtc;
	struct drm_mode_set set;
	int ret;

	/**
	 * Do nothing on the lastclose call from drm_unload.
	 */

	if (!dev_priv->is_opened)
		return;

	dev_priv->is_opened = false;
	set.x = 0;
	set.y = 0;
	set.fb = NULL;
	set.mode = NULL;
	set.connectors = NULL;
	set.num_connectors = 0;

	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
		set.crtc = crtc;
		ret = crtc->funcs->set_config(&set);
		WARN_ON(ret != 0);
	}

}

static void vmw_master_init(struct vmw_master *vmaster)
{
	ttm_lock_init(&vmaster->lock);
}

static int vmw_master_create(struct drm_device *dev,
			     struct drm_master *master)
{
	struct vmw_master *vmaster;

	DRM_INFO("Master create.\n");
	vmaster = kzalloc(sizeof(*vmaster), GFP_KERNEL);
	if (unlikely(vmaster == NULL))
		return -ENOMEM;

	ttm_lock_init(&vmaster->lock);
	ttm_lock_set_kill(&vmaster->lock, true, SIGTERM);
	master->driver_priv = vmaster;

	return 0;
}

static void vmw_master_destroy(struct drm_device *dev,
			       struct drm_master *master)
{
	struct vmw_master *vmaster = vmw_master(master);

	DRM_INFO("Master destroy.\n");
	master->driver_priv = NULL;
	kfree(vmaster);
}


static int vmw_master_set(struct drm_device *dev,
			  struct drm_file *file_priv,
			  bool from_open)
{
	struct vmw_private *dev_priv = vmw_priv(dev);
	struct vmw_fpriv *vmw_fp = vmw_fpriv(file_priv);
	struct vmw_master *active = dev_priv->active_master;
	struct vmw_master *vmaster = vmw_master(file_priv->master);
	int ret = 0;

	DRM_INFO("Master set.\n");
	if (dev_priv->stealth) {
		ret = vmw_request_device(dev_priv);
		if (unlikely(ret != 0))
			return ret;
	}

	if (active) {
		BUG_ON(active != &dev_priv->fbdev_master);
		ret = ttm_vt_lock(&active->lock, false, vmw_fp->tfile);
		if (unlikely(ret != 0))
			goto out_no_active_lock;

		ttm_lock_set_kill(&active->lock, true, SIGTERM);
		ret = ttm_bo_evict_mm(&dev_priv->bdev, TTM_PL_VRAM);
		if (unlikely(ret != 0)) {
			DRM_ERROR("Unable to clean VRAM on "
				  "master drop.\n");
		}

		dev_priv->active_master = NULL;
	}

	ttm_lock_set_kill(&vmaster->lock, false, SIGTERM);
	if (!from_open) {
		ttm_vt_unlock(&vmaster->lock);
		BUG_ON(vmw_fp->locked_master != file_priv->master);
		drm_master_put(&vmw_fp->locked_master);
	}

	dev_priv->active_master = vmaster;

	return 0;

out_no_active_lock:
	vmw_release_device(dev_priv);
	return ret;
}

static void vmw_master_drop(struct drm_device *dev,
			    struct drm_file *file_priv,
			    bool from_release)
{
	struct vmw_private *dev_priv = vmw_priv(dev);
	struct vmw_fpriv *vmw_fp = vmw_fpriv(file_priv);
	struct vmw_master *vmaster = vmw_master(file_priv->master);
	int ret;

	DRM_INFO("Master drop.\n");

	/**
	 * Make sure the master doesn't disappear while we have
	 * it locked.
	 */

	vmw_fp->locked_master = drm_master_get(file_priv->master);
	ret = ttm_vt_lock(&vmaster->lock, false, vmw_fp->tfile);

	if (unlikely((ret != 0))) {
		DRM_ERROR("Unable to lock TTM at VT switch.\n");
		drm_master_put(&vmw_fp->locked_master);
	}

	ttm_lock_set_kill(&vmaster->lock, true, SIGTERM);

	if (dev_priv->stealth) {
		ret = ttm_bo_evict_mm(&dev_priv->bdev, TTM_PL_VRAM);
		if (unlikely(ret != 0))
			DRM_ERROR("Unable to clean VRAM on master drop.\n");
		vmw_release_device(dev_priv);
	}
	dev_priv->active_master = &dev_priv->fbdev_master;
	ttm_lock_set_kill(&dev_priv->fbdev_master.lock, false, SIGTERM);
	ttm_vt_unlock(&dev_priv->fbdev_master.lock);

	if (!dev_priv->stealth)
		vmw_fb_on(dev_priv);
}


static void vmw_remove(struct pci_dev *pdev)
{
	struct drm_device *dev = pci_get_drvdata(pdev);

	drm_put_dev(dev);
}

static struct drm_driver driver = {
	.driver_features = DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED |
	DRIVER_MODESET,
	.load = vmw_driver_load,
	.unload = vmw_driver_unload,
	.firstopen = vmw_firstopen,
	.lastclose = vmw_lastclose,
	.irq_preinstall = vmw_irq_preinstall,
	.irq_postinstall = vmw_irq_postinstall,
	.irq_uninstall = vmw_irq_uninstall,
	.irq_handler = vmw_irq_handler,
	.reclaim_buffers_locked = NULL,
	.get_map_ofs = drm_core_get_map_ofs,
	.get_reg_ofs = drm_core_get_reg_ofs,
	.ioctls = vmw_ioctls,
	.num_ioctls = DRM_ARRAY_SIZE(vmw_ioctls),
	.dma_quiescent = NULL,	/*vmw_dma_quiescent, */
	.master_create = vmw_master_create,
	.master_destroy = vmw_master_destroy,
	.master_set = vmw_master_set,
	.master_drop = vmw_master_drop,
	.open = vmw_driver_open,
	.postclose = vmw_postclose,
	.fops = {
		 .owner = THIS_MODULE,
		 .open = drm_open,
		 .release = drm_release,
		 .unlocked_ioctl = vmw_unlocked_ioctl,
		 .mmap = vmw_mmap,
		 .poll = drm_poll,
		 .fasync = drm_fasync,
#if defined(CONFIG_COMPAT)
		 .compat_ioctl = drm_compat_ioctl,
#endif
		 },
	.pci_driver = {
		       .name = VMWGFX_DRIVER_NAME,
		       .id_table = vmw_pci_id_list,
		       .probe = vmw_probe,
		       .remove = vmw_remove
		       },
	.name = VMWGFX_DRIVER_NAME,
	.desc = VMWGFX_DRIVER_DESC,
	.date = VMWGFX_DRIVER_DATE,
	.major = VMWGFX_DRIVER_MAJOR,
	.minor = VMWGFX_DRIVER_MINOR,
	.patchlevel = VMWGFX_DRIVER_PATCHLEVEL
};

static int vmw_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	return drm_get_dev(pdev, ent, &driver);
}

static int __init vmwgfx_init(void)
{
	int ret;
	ret = drm_init(&driver);
	if (ret)
		DRM_ERROR("Failed initializing DRM.\n");
	return ret;
}

static void __exit vmwgfx_exit(void)
{
	drm_exit(&driver);
}

module_init(vmwgfx_init);
module_exit(vmwgfx_exit);

MODULE_AUTHOR("VMware Inc. and others");
MODULE_DESCRIPTION("Standalone drm driver for the VMware SVGA device");
MODULE_LICENSE("GPL and additional rights");