From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
On most gen2-4 platforms the GTT can be (or maybe always is?)
inside the stolen memory region. If that's the case, reduce the
size of the stolen memory appropriately to make make sure we
don't clobber the GTT.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_stolen.c | 36 ++++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_reg.h | 2 ++
2 files changed, 38 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index d284d89..deb349a 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -74,6 +74,42 @@ static unsigned long i915_stolen_to_physical(struct drm_device *dev)
if (base == 0)
return 0;
+ /* make sure we don't clobber the GTT if it's within stolen memory */
+ if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) {
+ struct {
+ u32 start, end;
+ } stolen[2] = {
+ { .start = base, .end = base + dev_priv->gtt.stolen_size, },
+ { .start = base, .end = base + dev_priv->gtt.stolen_size, },
+ };
+ u32 gtt_start = I915_READ(PGTBL_CTL) & PGTBL_ADDRESS_MASK;
+ u32 gtt_end = gtt_start + gtt_total_entries(dev_priv->gtt) * 4;
+
+ if (gtt_start >= stolen[0].start && gtt_start < stolen[0].end)
+ stolen[0].end = gtt_start;
+ if (gtt_end > stolen[1].start && gtt_end <= stolen[1].end)
+ stolen[1].start = gtt_end;
+
+ /* pick the larger of the two chunks */
+ if (stolen[0].end - stolen[0].start >
+ stolen[1].end - stolen[1].start) {
+ base = stolen[0].start;
+ dev_priv->gtt.stolen_size = stolen[0].end - stolen[0].start;
+ } else {
+ base = stolen[1].start;
+ dev_priv->gtt.stolen_size = stolen[1].end - stolen[1].start;
+ }
+
+ if (stolen[0].start != stolen[1].start ||
+ stolen[0].end != stolen[1].end) {
+ DRM_DEBUG_KMS("GTT within stolen memory at 0x%x-0x%x\n",
+ gtt_start, gtt_end - 1);
+ DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
+ base, base + (u32) dev_priv->gtt.stolen_size - 1);
+ }
+ }
+
+
/* Verify that nothing else uses this physical address. Stolen
* memory should be reserved by the BIOS and hidden from the
* kernel. So if the region is already marked as busy, something
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 3be449d..e7dde2c 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -630,6 +630,8 @@
/*
* Instruction and interrupt control regs
*/
+#define PGTBL_CTL 0x02020
+#define PGTBL_ADDRESS_MASK 0xfffff000
#define PGTBL_ER 0x02024
#define RENDER_RING_BASE 0x02000
#define BSD_RING_BASE 0x04000
--
1.8.3.2
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