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drm/vmwgfx: Take the ttm lock around the dirty ioctl

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This makes sure noone accesses the fifo while it's taken down using the
dirty ioctl.
Also make sure all workqueues are idled before the fifo is taken down.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Thomas Hellstrom 2010-10-05 12:43:03 +02:00 committed by Dave Airlie
parent 02b001624f
commit 3a939a5ece
3 changed files with 84 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
View File

@ -597,6 +597,8 @@ static void vmw_lastclose(struct drm_device *dev)
static void vmw_master_init(struct vmw_master *vmaster)
{
ttm_lock_init(&vmaster->lock);
INIT_LIST_HEAD(&vmaster->fb_surf);
mutex_init(&vmaster->fb_surf_mutex);
}
static int vmw_master_create(struct drm_device *dev,
@ -608,7 +610,7 @@ static int vmw_master_create(struct drm_device *dev,
if (unlikely(vmaster == NULL))
return -ENOMEM;
ttm_lock_init(&vmaster->lock);
vmw_master_init(vmaster);
ttm_lock_set_kill(&vmaster->lock, true, SIGTERM);
master->driver_priv = vmaster;
@ -699,6 +701,7 @@ static void vmw_master_drop(struct drm_device *dev,
vmw_fp->locked_master = drm_master_get(file_priv->master);
ret = ttm_vt_lock(&vmaster->lock, false, vmw_fp->tfile);
vmw_kms_idle_workqueues(vmaster);
if (unlikely((ret != 0))) {
DRM_ERROR("Unable to lock TTM at VT switch.\n");

3
drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
View File

@ -151,6 +151,8 @@ struct vmw_overlay;
struct vmw_master {
struct ttm_lock lock;
struct mutex fb_surf_mutex;
struct list_head fb_surf;
};
struct vmw_vga_topology_state {
@ -519,6 +521,7 @@ void vmw_kms_write_svga(struct vmw_private *vmw_priv,
unsigned bbp, unsigned depth);
int vmw_kms_update_layout_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
void vmw_kms_idle_workqueues(struct vmw_master *vmaster);
u32 vmw_get_vblank_counter(struct drm_device *dev, int crtc);
/**

84
drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
View File

@ -332,18 +332,55 @@ struct vmw_framebuffer_surface {
struct delayed_work d_work;
struct mutex work_lock;
bool present_fs;
struct list_head head;
struct drm_master *master;
};
/**
* vmw_kms_idle_workqueues - Flush workqueues on this master
*
* @vmaster - Pointer identifying the master, for the surfaces of which
* we idle the dirty work queues.
*
* This function should be called with the ttm lock held in exclusive mode
* to idle all dirty work queues before the fifo is taken down.
*
* The work task may actually requeue itself, but after the flush returns we're
* sure that there's nothing to present, since the ttm lock is held in
* exclusive mode, so the fifo will never get used.
*/
void vmw_kms_idle_workqueues(struct vmw_master *vmaster)
{
struct vmw_framebuffer_surface *entry;
mutex_lock(&vmaster->fb_surf_mutex);
list_for_each_entry(entry, &vmaster->fb_surf, head) {
if (cancel_delayed_work_sync(&entry->d_work))
(void) entry->d_work.work.func(&entry->d_work.work);
(void) cancel_delayed_work_sync(&entry->d_work);
}
mutex_unlock(&vmaster->fb_surf_mutex);
}
void vmw_framebuffer_surface_destroy(struct drm_framebuffer *framebuffer)
{
struct vmw_framebuffer_surface *vfb =
struct vmw_framebuffer_surface *vfbs =
vmw_framebuffer_to_vfbs(framebuffer);
struct vmw_master *vmaster = vmw_master(vfbs->master);
cancel_delayed_work_sync(&vfb->d_work);
mutex_lock(&vmaster->fb_surf_mutex);
list_del(&vfbs->head);
mutex_unlock(&vmaster->fb_surf_mutex);
cancel_delayed_work_sync(&vfbs->d_work);
drm_master_put(&vfbs->master);
drm_framebuffer_cleanup(framebuffer);
vmw_surface_unreference(&vfb->surface);
vmw_surface_unreference(&vfbs->surface);
kfree(framebuffer);
kfree(vfbs);
}
static void vmw_framebuffer_present_fs_callback(struct work_struct *work)
@ -362,6 +399,12 @@ static void vmw_framebuffer_present_fs_callback(struct work_struct *work)
SVGA3dCopyRect cr;
} *cmd;
/**
* Strictly we should take the ttm_lock in read mode before accessing
* the fifo, to make sure the fifo is present and up. However,
* instead we flush all workqueues under the ttm lock in exclusive mode
* before taking down the fifo.
*/
mutex_lock(&vfbs->work_lock);
if (!vfbs->present_fs)
goto out_unlock;
@ -398,12 +441,14 @@ int vmw_framebuffer_surface_dirty(struct drm_framebuffer *framebuffer,
unsigned num_clips)
{
struct vmw_private *dev_priv = vmw_priv(framebuffer->dev);
struct vmw_master *vmaster = vmw_master(file_priv->master);
struct vmw_framebuffer_surface *vfbs =
vmw_framebuffer_to_vfbs(framebuffer);
struct vmw_surface *surf = vfbs->surface;
struct drm_clip_rect norect;
SVGA3dCopyRect *cr;
int i, inc = 1;
int ret;
struct {
SVGA3dCmdHeader header;
@ -411,6 +456,13 @@ int vmw_framebuffer_surface_dirty(struct drm_framebuffer *framebuffer,
SVGA3dCopyRect cr;
} *cmd;
if (unlikely(vfbs->master != file_priv->master))
return -EINVAL;
ret = ttm_read_lock(&vmaster->lock, true);
if (unlikely(ret != 0))
return ret;
if (!num_clips ||
!(dev_priv->fifo.capabilities &
SVGA_FIFO_CAP_SCREEN_OBJECT)) {
@ -426,6 +478,7 @@ int vmw_framebuffer_surface_dirty(struct drm_framebuffer *framebuffer,
*/
vmw_framebuffer_present_fs_callback(&vfbs->d_work.work);
}
ttm_read_unlock(&vmaster->lock);
return 0;
}
@ -443,6 +496,7 @@ int vmw_framebuffer_surface_dirty(struct drm_framebuffer *framebuffer,
cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd) + (num_clips - 1) * sizeof(cmd->cr));
if (unlikely(cmd == NULL)) {
DRM_ERROR("Fifo reserve failed.\n");
ttm_read_unlock(&vmaster->lock);
return -ENOMEM;
}
@ -462,7 +516,7 @@ int vmw_framebuffer_surface_dirty(struct drm_framebuffer *framebuffer,
}
vmw_fifo_commit(dev_priv, sizeof(*cmd) + (num_clips - 1) * sizeof(cmd->cr));
ttm_read_unlock(&vmaster->lock);
return 0;
}
@ -473,6 +527,7 @@ static struct drm_framebuffer_funcs vmw_framebuffer_surface_funcs = {
};
static int vmw_kms_new_framebuffer_surface(struct vmw_private *dev_priv,
struct drm_file *file_priv,
struct vmw_surface *surface,
struct vmw_framebuffer **out,
const struct drm_mode_fb_cmd
@ -482,6 +537,7 @@ static int vmw_kms_new_framebuffer_surface(struct vmw_private *dev_priv,
struct drm_device *dev = dev_priv->dev;
struct vmw_framebuffer_surface *vfbs;
enum SVGA3dSurfaceFormat format;
struct vmw_master *vmaster = vmw_master(file_priv->master);
int ret;
/*
@ -546,8 +602,14 @@ static int vmw_kms_new_framebuffer_surface(struct vmw_private *dev_priv,
vfbs->base.pin = &vmw_surface_dmabuf_pin;
vfbs->base.unpin = &vmw_surface_dmabuf_unpin;
vfbs->surface = surface;
vfbs->master = drm_master_get(file_priv->master);
mutex_init(&vfbs->work_lock);
mutex_lock(&vmaster->fb_surf_mutex);
INIT_DELAYED_WORK(&vfbs->d_work, &vmw_framebuffer_present_fs_callback);
list_add_tail(&vfbs->head, &vmaster->fb_surf);
mutex_unlock(&vmaster->fb_surf_mutex);
*out = &vfbs->base;
return 0;
@ -590,13 +652,19 @@ int vmw_framebuffer_dmabuf_dirty(struct drm_framebuffer *framebuffer,
unsigned num_clips)
{
struct vmw_private *dev_priv = vmw_priv(framebuffer->dev);
struct vmw_master *vmaster = vmw_master(file_priv->master);
struct drm_clip_rect norect;
int ret;
struct {
uint32_t header;
SVGAFifoCmdUpdate body;
} *cmd;
int i, increment = 1;
ret = ttm_read_lock(&vmaster->lock, true);
if (unlikely(ret != 0))
return ret;
if (!num_clips) {
num_clips = 1;
clips = &norect;
@ -611,6 +679,7 @@ int vmw_framebuffer_dmabuf_dirty(struct drm_framebuffer *framebuffer,
cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd) * num_clips);
if (unlikely(cmd == NULL)) {
DRM_ERROR("Fifo reserve failed.\n");
ttm_read_unlock(&vmaster->lock);
return -ENOMEM;
}
@ -623,6 +692,7 @@ int vmw_framebuffer_dmabuf_dirty(struct drm_framebuffer *framebuffer,
}
vmw_fifo_commit(dev_priv, sizeof(*cmd) * num_clips);
ttm_read_unlock(&vmaster->lock);
return 0;
}
@ -795,8 +865,8 @@ static struct drm_framebuffer *vmw_kms_fb_create(struct drm_device *dev,
if (!surface->scanout)
goto err_not_scanout;
ret = vmw_kms_new_framebuffer_surface(dev_priv, surface, &vfb,
mode_cmd);
ret = vmw_kms_new_framebuffer_surface(dev_priv, file_priv, surface,
&vfb, mode_cmd);
/* vmw_user_surface_lookup takes one ref so does new_fb */
vmw_surface_unreference(&surface);