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drm/i915: Install fence register for tiled scanout on i915 

With the work by Jesse Barnes to eliminate allocation of fences during
execbuffer, it becomes possible to write to the scan-out buffer with it
never acquiring a fence (simply by only ever writing to the object using
tiled GPU commands and never writing to it via the GTT). So for pre-i965
chipsets which require fenced access for tiled scan-out buffers, we need
to obtain a fence register.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Chris Wilson 2009-06-17 22:08:52 +01:00 committed by Eric Anholt
parent d78b47b9a5
commit 8c4b8c3f34
3 changed files with 21 additions and 10 deletions
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1
drivers/gpu/drm/i915/i915_drv.h
View File

@ -646,6 +646,7 @@ void i915_gem_object_unpin(struct drm_gem_object *obj);
int i915_gem_object_unbind(struct drm_gem_object *obj);
void i915_gem_lastclose(struct drm_device *dev);
uint32_t i915_get_gem_seqno(struct drm_device *dev);
int i915_gem_object_get_fence_reg(struct drm_gem_object *obj);
void i915_gem_retire_requests(struct drm_device *dev);
void i915_gem_retire_work_handler(struct work_struct *work);
void i915_gem_clflush_object(struct drm_gem_object *obj);

10
drivers/gpu/drm/i915/i915_gem.c
View File

@ -46,7 +46,6 @@ static void i915_gem_object_set_to_full_cpu_read_domain(struct drm_gem_object *o
static int i915_gem_object_wait_rendering(struct drm_gem_object *obj);
static int i915_gem_object_bind_to_gtt(struct drm_gem_object *obj,
unsigned alignment);
static int i915_gem_object_get_fence_reg(struct drm_gem_object *obj, bool write);
static void i915_gem_clear_fence_reg(struct drm_gem_object *obj);
static int i915_gem_evict_something(struct drm_device *dev);
static int i915_gem_phys_pwrite(struct drm_device *dev, struct drm_gem_object *obj,
@ -1158,7 +1157,7 @@ int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
/* Need a new fence register? */
if (obj_priv->fence_reg == I915_FENCE_REG_NONE &&
obj_priv->tiling_mode != I915_TILING_NONE) {
ret = i915_gem_object_get_fence_reg(obj, write);
ret = i915_gem_object_get_fence_reg(obj);
if (ret) {
mutex_unlock(&dev->struct_mutex);
return VM_FAULT_SIGBUS;
@ -2169,7 +2168,6 @@ static void i830_write_fence_reg(struct drm_i915_fence_reg *reg)
/**
* i915_gem_object_get_fence_reg - set up a fence reg for an object
* @obj: object to map through a fence reg
* @write: object is about to be written
*
* When mapping objects through the GTT, userspace wants to be able to write
* to them without having to worry about swizzling if the object is tiled.
@ -2180,8 +2178,8 @@ static void i830_write_fence_reg(struct drm_i915_fence_reg *reg)
* It then sets up the reg based on the object's properties: address, pitch
* and tiling format.
*/
static int
i915_gem_object_get_fence_reg(struct drm_gem_object *obj, bool write)
int
i915_gem_object_get_fence_reg(struct drm_gem_object *obj)
{
struct drm_device *dev = obj->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
@ -3550,7 +3548,7 @@ i915_gem_object_pin(struct drm_gem_object *obj, uint32_t alignment)
if (!IS_I965G(dev) &&
obj_priv->fence_reg == I915_FENCE_REG_NONE &&
obj_priv->tiling_mode != I915_TILING_NONE) {
ret = i915_gem_object_get_fence_reg(obj, true);
ret = i915_gem_object_get_fence_reg(obj);
if (ret != 0) {
if (ret != -EBUSY && ret != -ERESTARTSYS)
DRM_ERROR("Failure to install fence: %d\n",

20
drivers/gpu/drm/i915/intel_display.c
View File

@ -828,19 +828,31 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
}
mutex_lock(&dev->struct_mutex);
ret = i915_gem_object_pin(intel_fb->obj, alignment);
ret = i915_gem_object_pin(obj, alignment);
if (ret != 0) {
mutex_unlock(&dev->struct_mutex);
return ret;
}
ret = i915_gem_object_set_to_gtt_domain(intel_fb->obj, 1);
ret = i915_gem_object_set_to_gtt_domain(obj, 1);
if (ret != 0) {
i915_gem_object_unpin(intel_fb->obj);
i915_gem_object_unpin(obj);
mutex_unlock(&dev->struct_mutex);
return ret;
}
/* Pre-i965 needs to install a fence for tiled scan-out */
if (!IS_I965G(dev) &&
obj_priv->fence_reg == I915_FENCE_REG_NONE &&
obj_priv->tiling_mode != I915_TILING_NONE) {
ret = i915_gem_object_get_fence_reg(obj);
if (ret != 0) {
i915_gem_object_unpin(obj);
mutex_unlock(&dev->struct_mutex);
return ret;
}
}
dspcntr = I915_READ(dspcntr_reg);
/* Mask out pixel format bits in case we change it */
dspcntr &= ~DISPPLANE_PIXFORMAT_MASK;
@ -860,7 +872,7 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
break;
default:
DRM_ERROR("Unknown color depth\n");
i915_gem_object_unpin(intel_fb->obj);
i915_gem_object_unpin(obj);
mutex_unlock(&dev->struct_mutex);
return -EINVAL;
}