diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index ae68ac1c488e..192b27e9046c 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -1585,6 +1585,64 @@ static const struct file_operations i915_wedged_fops = { .llseek = default_llseek, }; +static ssize_t +i915_ring_stop_read(struct file *filp, + char __user *ubuf, + size_t max, + loff_t *ppos) +{ + struct drm_device *dev = filp->private_data; + drm_i915_private_t *dev_priv = dev->dev_private; + char buf[20]; + int len; + + len = snprintf(buf, sizeof(buf), + "0x%08x\n", dev_priv->stop_rings); + + if (len > sizeof(buf)) + len = sizeof(buf); + + return simple_read_from_buffer(ubuf, max, ppos, buf, len); +} + +static ssize_t +i915_ring_stop_write(struct file *filp, + const char __user *ubuf, + size_t cnt, + loff_t *ppos) +{ + struct drm_device *dev = filp->private_data; + struct drm_i915_private *dev_priv = dev->dev_private; + char buf[20]; + int val = 0; + + if (cnt > 0) { + if (cnt > sizeof(buf) - 1) + return -EINVAL; + + if (copy_from_user(buf, ubuf, cnt)) + return -EFAULT; + buf[cnt] = 0; + + val = simple_strtoul(buf, NULL, 0); + } + + DRM_DEBUG_DRIVER("Stopping rings 0x%08x\n", val); + + mutex_lock(&dev->struct_mutex); + dev_priv->stop_rings = val; + mutex_unlock(&dev->struct_mutex); + + return cnt; +} + +static const struct file_operations i915_ring_stop_fops = { + .owner = THIS_MODULE, + .open = simple_open, + .read = i915_ring_stop_read, + .write = i915_ring_stop_write, + .llseek = default_llseek, +}; static ssize_t i915_max_freq_read(struct file *filp, char __user *ubuf, @@ -1885,6 +1943,11 @@ int i915_debugfs_init(struct drm_minor *minor) &i915_cache_sharing_fops); if (ret) return ret; + ret = i915_debugfs_create(minor->debugfs_root, minor, + "i915_ring_stop", + &i915_ring_stop_fops); + if (ret) + return ret; return drm_debugfs_create_files(i915_debugfs_list, I915_DEBUGFS_ENTRIES, @@ -1903,6 +1966,8 @@ void i915_debugfs_cleanup(struct drm_minor *minor) 1, minor); drm_debugfs_remove_files((struct drm_info_list *) &i915_cache_sharing_fops, 1, minor); + drm_debugfs_remove_files((struct drm_info_list *) &i915_ring_stop_fops, + 1, minor); } #endif /* CONFIG_DEBUG_FS */ diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index 8a98f9a16418..90a84f9de8e9 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -800,6 +800,8 @@ int i915_reset(struct drm_device *dev, u8 flags) if (!mutex_trylock(&dev->struct_mutex)) return -EBUSY; + dev_priv->stop_rings = 0; + i915_gem_reset(dev); ret = -ENODEV; diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 00a20e985d28..090ec20293f2 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -412,6 +412,8 @@ typedef struct drm_i915_private { uint32_t last_instdone; uint32_t last_instdone1; + unsigned int stop_rings; + unsigned long cfb_size; unsigned int cfb_fb; enum plane cfb_plane; diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 38096080a3de..3aabe8dfe5c5 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -1210,7 +1210,11 @@ int intel_ring_begin(struct intel_ring_buffer *ring, void intel_ring_advance(struct intel_ring_buffer *ring) { + struct drm_i915_private *dev_priv = ring->dev->dev_private; + ring->tail &= ring->size - 1; + if (dev_priv->stop_rings & intel_ring_flag(ring)) + return; ring->write_tail(ring, ring->tail); }