Based upon a patch from Deepak, but reworked to only apply on gen7+
and with the logic a bit clarified.
Cc: Deepak S <deepak.s@xxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_stolen.c | 13 +++++++++++--
drivers/gpu/drm/i915/i915_reg.h | 8 ++++++++
2 files changed, 19 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index 21c025a209c0..15d42b3e2029 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -289,6 +289,7 @@ void i915_gem_cleanup_stolen(struct drm_device *dev)
int i915_gem_init_stolen(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
+ u32 tmp;
int bios_reserved = 0;
#ifdef CONFIG_INTEL_IOMMU
@@ -308,8 +309,16 @@ int i915_gem_init_stolen(struct drm_device *dev)
DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n",
dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base);
- if (IS_VALLEYVIEW(dev))
- bios_reserved = 1024*1024; /* top 1M on VLV/BYT */
+ if (INTEL_INFO(dev)->gen >= 8) {
+ tmp = I915_READ(GEN7_BIOS_RESERVED);
+ tmp >>= GEN8_BIOS_RESERVED_SHIFT;
+ tmp &= GEN8_BIOS_RESERVED_SHIFT;
+ bios_reserved = (1024*1024) << tmp;
+ } else if (IS_GEN7(dev)) {
+ tmp = I915_READ(GEN7_BIOS_RESERVED);
+ bios_reserved = tmp & GEN7_BIOS_RESERVED_256K ?
+ 256*1024 : 1024*1024;
+ }
if (WARN_ON(bios_reserved > dev_priv->gtt.stolen_size))
return 0;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 15c0eaa9f97f..eb1430974a9a 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -143,6 +143,14 @@
#define GAB_CTL 0x24000
#define GAB_CTL_CONT_AFTER_PAGEFAULT (1<<8)
+#define GEN7_BIOS_RESERVED 0x1082C0
+#define GEN7_BIOS_RESERVED_1M (0 << 5)
+#define GEN7_BIOS_RESERVED_256K (1 << 5)
+#define GEN8_BIOS_RESERVED_SHIFT 7
+#define GEN7_BIOS_RESERVED_MASK 0x1
+#define GEN8_BIOS_RESERVED_MASK 0x3
+
+
/* VGA stuff */
#define VGA_ST01_MDA 0x3ba
--
2.0.1
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