The FBC hardware for these platforms doesn't have access to the
bios_reserved range, so it always assumes the maximum (8mb) is used.
So avoid this range while allocating.
This solves a bunch of FIFO underruns that happen if you end up
putting the CFB in that memory range. On my machine, with 32mb of
stolen, I need a 2560x1440 mode for that.
Testcase: igt/kms_frontbuffer_tracking/fbc-* (given the right setup)
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 4 ++++
drivers/gpu/drm/i915/i915_gem_gtt.h | 1 +
drivers/gpu/drm/i915/i915_gem_stolen.c | 26 +++++++++++++++++++-------
drivers/gpu/drm/i915/intel_fbc.c | 16 ++++++++++++++--
4 files changed, 38 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 8cf2969..1f02a5a 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3173,6 +3173,10 @@ static inline void i915_gem_chipset_flush(struct drm_device *dev)
int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
struct drm_mm_node *node, u64 size,
unsigned alignment);
+int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *dev_priv,
+ struct drm_mm_node *node, u64 size,
+ unsigned alignment, u64 start,
+ u64 end);
void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
struct drm_mm_node *node);
int i915_gem_init_stolen(struct drm_device *dev);
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index 8275007..96ebb98 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -341,6 +341,7 @@ struct i915_gtt {
struct i915_address_space base;
size_t stolen_size; /* Total size of stolen memory */
+ size_t stolen_usable_size; /* Total size minus BIOS reserved */
u64 mappable_end; /* End offset that we can CPU map */
struct io_mapping *mappable; /* Mapping to our CPU mappable region */
phys_addr_t mappable_base; /* PA of our GMADR */
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index bf26ecc..081ef6d 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -42,9 +42,9 @@
* for is a boon.
*/
-int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
- struct drm_mm_node *node, u64 size,
- unsigned alignment)
+int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *dev_priv,
+ struct drm_mm_node *node, u64 size,
+ unsigned alignment, u64 start, u64 end)
{
int ret;
@@ -52,13 +52,23 @@ int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
return -ENODEV;
mutex_lock(&dev_priv->mm.stolen_lock);
- ret = drm_mm_insert_node(&dev_priv->mm.stolen, node, size, alignment,
- DRM_MM_SEARCH_DEFAULT);
+ ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node, size,
+ alignment, start, end,
+ DRM_MM_SEARCH_DEFAULT);
mutex_unlock(&dev_priv->mm.stolen_lock);
return ret;
}
+int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
+ struct drm_mm_node *node, u64 size,
+ unsigned alignment)
+{
+ return i915_gem_stolen_insert_node_in_range(dev_priv, node, size,
+ alignment, 0,
+ dev_priv->gtt.stolen_usable_size);
+}
+
void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
struct drm_mm_node *node)
{
@@ -355,9 +365,11 @@ int i915_gem_init_stolen(struct drm_device *dev)
dev_priv->gtt.stolen_size >> 10,
(dev_priv->gtt.stolen_size - reserved_total) >> 10);
+ dev_priv->gtt.stolen_usable_size = dev_priv->gtt.stolen_size -
+ reserved_total;
+
/* Basic memrange allocator for stolen space */
- drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size -
- reserved_total);
+ drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_usable_size);
return 0;
}
diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
index db38091..6f3c2ea 100644
--- a/drivers/gpu/drm/i915/intel_fbc.c
+++ b/drivers/gpu/drm/i915/intel_fbc.c
@@ -551,6 +551,16 @@ static int find_compression_threshold(struct drm_i915_private *dev_priv,
{
int compression_threshold = 1;
int ret;
+ u64 end;
+
+ /* The FBC hardware for BDW/SKL doesn't have access to the stolen
+ * reserved range size, so it always assumes the maximum (8mb) is used.
+ * If we enable FBC using a CFB on that memory range we'll get FIFO
+ * underruns, even if that range is not reserved by the BIOS. */
+ if (IS_BROADWELL(dev_priv) || IS_SKYLAKE(dev_priv))
+ end = dev_priv->gtt.stolen_size - 8 * 1024 * 1024;
+ else
+ end = dev_priv->gtt.stolen_usable_size;
/* HACK: This code depends on what we will do in *_enable_fbc. If that
* code changes, this code needs to change as well.
@@ -560,7 +570,8 @@ static int find_compression_threshold(struct drm_i915_private *dev_priv,
*/
/* Try to over-allocate to reduce reallocations and fragmentation. */
- ret = i915_gem_stolen_insert_node(dev_priv, node, size <<= 1, 4096);
+ ret = i915_gem_stolen_insert_node_in_range(dev_priv, node, size <<= 1,
+ 4096, 0, end);
if (ret == 0)
return compression_threshold;
@@ -570,7 +581,8 @@ again:
(fb_cpp == 2 && compression_threshold == 2))
return 0;
- ret = i915_gem_stolen_insert_node(dev_priv, node, size >>= 1, 4096);
+ ret = i915_gem_stolen_insert_node_in_range(dev_priv, node, size >>= 1,
+ 4096, 0, end);
if (ret && INTEL_INFO(dev_priv)->gen <= 4) {
return 0;
} else if (ret) {
--
2.5.1
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