[PATCH 06/18] drm/i915: Delay allocation of stolen space for FBC

Chris Wilson
2012-10-19T17:05:02Z

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@chris-wilson.co.uk>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---
drivers/gpu/drm/i915/i915_drv.h | 2 +
drivers/gpu/drm/i915/i915_gem_stolen.c | 115 ++++++++++++++++----------------
drivers/gpu/drm/i915/intel_display.c | 3 +
drivers/gpu/drm/i915/intel_pm.c | 3 +-
4 files changed, 66 insertions(+), 57 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 589b2f3..997abb3 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1516,6 +1516,8 @@ 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_stolen_cleanup_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 d023ed6..68ef22a 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -89,21 +89,13 @@ 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)
@@ -111,11 +103,11 @@ 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)
@@ -124,56 +116,81 @@ 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)
+void i915_gem_stolen_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->cfb_size == 0)
+ return;
+
+ 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_gem_stolen_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)
@@ -183,21 +200,7 @@ 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 c2c219b..2ef497d0 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -8351,6 +8351,9 @@ 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);
}

static void
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 2b3cddf..9ee53cb 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -440,7 +440,7 @@ void intel_update_fbc(struct drm_device *dev)
dev_priv->no_fbc_reason = FBC_MODULE_PARAM;
goto out_disable;
}
- if (intel_fb->obj->base.size > dev_priv->cfb_size) {
+ if (intel_fb->obj->base.size > i915_gem_stolen_setup_compression(dev)) {
DRM_DEBUG_KMS("framebuffer too large, disabling "
"compression\n");
dev_priv->no_fbc_reason = FBC_STOLEN_TOO_SMALL;
@@ -526,6 +526,7 @@ out_disable:
DRM_DEBUG_KMS("unsupported config, disabling FBC\n");
intel_disable_fbc(dev);
}
+ i915_gem_stolen_cleanup_compression(dev);
}

static void i915_pineview_get_mem_freq(struct drm_device *dev)
--
1.7.10.4