[Intel-gfx] [PATCH 12/24] drm/i915: Delay allocation of stolen space for FBC
Chris Wilson
chris at chris-wilson.co.uk
Thu Aug 30 17:31:07 CEST 2012
As we may wish to wrap regions preallocated by the BIOS, we need to do
that before carving out contiguous chunks of stolen space for FBC.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/i915_gem_stolen.c | 110 ++++++++++++++++----------------
drivers/gpu/drm/i915/intel_display.c | 3 +
3 files changed, 59 insertions(+), 55 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 533361e..31d3a9f 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1491,6 +1491,7 @@ int i915_gem_evict_everything(struct drm_device *dev);
/* i915_gem_stolen.c */
int i915_gem_init_stolen(struct drm_device *dev);
+int i915_gem_stolen_setup_compression(struct drm_device *dev);
void i915_gem_cleanup_stolen(struct drm_device *dev);
/* i915_gem_tiling.c */
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index a528e4a..17119d7 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -86,21 +86,13 @@ static unsigned long i915_stolen_to_physical(struct drm_device *dev)
return base;
}
-static void i915_warn_stolen(struct drm_device *dev)
-{
- DRM_INFO("not enough stolen space for compressed buffer, disabling\n");
- DRM_INFO("hint: you may be able to increase stolen memory size in the BIOS to avoid this\n");
-}
-
-static void i915_setup_compression(struct drm_device *dev, int size)
+static int i915_setup_compression(struct drm_device *dev, int size)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_mm_node *compressed_fb, *uninitialized_var(compressed_llb);
- unsigned long cfb_base;
- unsigned long ll_base = 0;
- /* Just in case the BIOS is doing something questionable. */
- intel_disable_fbc(dev);
+ DRM_DEBUG_KMS("reserving %d bytes of contiguous stolen space for FBC\n",
+ size);
compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen, size, 4096, 0);
if (compressed_fb)
@@ -108,11 +100,11 @@ static void i915_setup_compression(struct drm_device *dev, int size)
if (!compressed_fb)
goto err;
- cfb_base = dev_priv->mm.stolen_base + compressed_fb->start;
- if (!cfb_base)
- goto err_fb;
-
- if (!(IS_GM45(dev) || HAS_PCH_SPLIT(dev))) {
+ if (HAS_PCH_SPLIT(dev))
+ I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start);
+ else if (IS_GM45(dev)) {
+ I915_WRITE(DPFC_CB_BASE, compressed_fb->start);
+ } else {
compressed_llb = drm_mm_search_free(&dev_priv->mm.stolen,
4096, 4096, 0);
if (compressed_llb)
@@ -121,56 +113,78 @@ static void i915_setup_compression(struct drm_device *dev, int size)
if (!compressed_llb)
goto err_fb;
- ll_base = dev_priv->mm.stolen_base + compressed_llb->start;
- if (!ll_base)
- goto err_llb;
- }
+ dev_priv->compressed_llb = compressed_llb;
- dev_priv->cfb_size = size;
+ I915_WRITE(FBC_CFB_BASE,
+ dev_priv->mm.stolen_base + compressed_fb->start);
+ I915_WRITE(FBC_LL_BASE,
+ dev_priv->mm.stolen_base + compressed_llb->start);
+ }
dev_priv->compressed_fb = compressed_fb;
- if (HAS_PCH_SPLIT(dev))
- I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start);
- else if (IS_GM45(dev)) {
- I915_WRITE(DPFC_CB_BASE, compressed_fb->start);
- } else {
- I915_WRITE(FBC_CFB_BASE, cfb_base);
- I915_WRITE(FBC_LL_BASE, ll_base);
- dev_priv->compressed_llb = compressed_llb;
- }
+ dev_priv->cfb_size = size;
- DRM_DEBUG_KMS("FBC base 0x%08lx, ll base 0x%08lx, size %dM\n",
- (long)cfb_base, (long)ll_base, size >> 20);
- return;
+ return size;
-err_llb:
- drm_mm_put_block(compressed_llb);
err_fb:
drm_mm_put_block(compressed_fb);
err:
dev_priv->no_fbc_reason = FBC_STOLEN_TOO_SMALL;
- i915_warn_stolen(dev);
+ DRM_INFO("not enough stolen space for compressed buffer (need %d bytes), disabling\n", size);
+ DRM_INFO("hint: you may be able to increase stolen memory size in the BIOS to avoid this\n");
+ return 0;
+}
+
+int i915_gem_stolen_setup_compression(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct drm_mm_node *node;
+ unsigned long hole_start, hole_end, size;
+
+ if (dev_priv->mm.stolen_base == 0)
+ return 0;
+
+ if (dev_priv->cfb_size)
+ return dev_priv->cfb_size;
+
+ /* Try to set up FBC with a reasonable compressed buffer size */
+ size = 0;
+ drm_mm_for_each_hole(node, &dev_priv->mm.stolen, hole_start, hole_end) {
+ unsigned long hole_size = hole_end - hole_start;
+ if (hole_size > size)
+ size = hole_size;
+ }
+
+ /* Try to get a 32M buffer... */
+ if (size > (36*1024*1024))
+ size = 32*1024*1024;
+ else /* fall back to 3/4 of the stolen space */
+ size = size * 3 / 4;
+
+ return i915_setup_compression(dev, size);
}
static void i915_cleanup_compression(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
- drm_mm_put_block(dev_priv->compressed_fb);
+ if (dev_priv->compressed_fb)
+ drm_mm_put_block(dev_priv->compressed_fb);
+
if (dev_priv->compressed_llb)
drm_mm_put_block(dev_priv->compressed_llb);
+
+ dev_priv->cfb_size = 0;
}
void i915_gem_cleanup_stolen(struct drm_device *dev)
{
- if (I915_HAS_FBC(dev) && i915_powersave)
- i915_cleanup_compression(dev);
+ i915_cleanup_compression(dev);
}
int i915_gem_init_stolen(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
- unsigned long prealloc_size = dev_priv->mm.gtt->stolen_size;
dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
if (dev_priv->mm.stolen_base == 0)
@@ -180,21 +194,7 @@ int i915_gem_init_stolen(struct drm_device *dev)
dev_priv->mm.gtt->stolen_size, dev_priv->mm.stolen_base);
/* Basic memrange allocator for stolen space */
- drm_mm_init(&dev_priv->mm.stolen, 0, prealloc_size);
-
- /* Try to set up FBC with a reasonable compressed buffer size */
- if (I915_HAS_FBC(dev) && i915_powersave) {
- int cfb_size;
-
- /* Leave 1M for line length buffer & misc. */
-
- /* Try to get a 32M buffer... */
- if (prealloc_size > (36*1024*1024))
- cfb_size = 32*1024*1024;
- else /* fall back to 7/8 of the stolen space */
- cfb_size = prealloc_size * 7 / 8;
- i915_setup_compression(dev, cfb_size);
- }
+ drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->mm.gtt->stolen_size);
return 0;
}
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 778cbb8..221d035 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -7231,6 +7231,9 @@ void intel_modeset_init(struct drm_device *dev)
/* Just disable it once at startup */
i915_disable_vga(dev);
intel_setup_outputs(dev);
+
+ /* Just in case the BIOS is doing something questionable. */
+ intel_disable_fbc(dev);
}
void intel_modeset_gem_init(struct drm_device *dev)
--
1.7.10.4
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