[Intel-gfx] [PATCH 03/36] drm/i915/stolen: Deduce base of reserved portion as top-size on vlv
Chris Wilson
chris at chris-wilson.co.uk
Wed Mar 14 09:37:15 UTC 2018
On Valleyview, the HW deduces the base of the reserved portion of stolen
memory as being (top - size) and the address field within
GEN6_STOLEN_RESERVED is set to 0. Add yet another GEN6_STOLEN_RESERVED
reader to cope with the subtly different path required for vlv.
v2: Avoid using reserved_base = reserved_size = 0 as the invalid
condition as that typically falls outside of the stolen region,
provoking a consistency error.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Imre Deak <imre.deak at intel.com>
---
drivers/gpu/drm/i915/i915_gem_stolen.c | 103 ++++++++++++++++++---------------
1 file changed, 56 insertions(+), 47 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index 7cc273e690d0..664afcffc41d 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -185,11 +185,8 @@ static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
DRM_DEBUG_DRIVER("%s_STOLEN_RESERVED = %08x\n",
IS_GM45(dev_priv) ? "CTG" : "ELK", reg_val);
- if ((reg_val & G4X_STOLEN_RESERVED_ENABLE) == 0) {
- *base = 0;
- *size = 0;
+ if ((reg_val & G4X_STOLEN_RESERVED_ENABLE) == 0)
return;
- }
/*
* Whether ILK really reuses the ELK register for this is unclear.
@@ -197,18 +194,13 @@ static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
*/
WARN(IS_GEN5(dev_priv), "ILK stolen reserved found? 0x%08x\n", reg_val);
- *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
+ if (!(reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK))
+ return;
+ *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
- /* On these platforms, the register doesn't have a size field, so the
- * size is the distance between the base and the top of the stolen
- * memory. We also have the genuine case where base is zero and there's
- * nothing reserved. */
- if (*base == 0)
- *size = 0;
- else
- *size = stolen_top - *base;
+ *size = stolen_top - *base;
}
static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
@@ -219,11 +211,8 @@ static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = %08x\n", reg_val);
- if ((reg_val & GEN6_STOLEN_RESERVED_ENABLE) == 0) {
- *base = 0;
- *size = 0;
+ if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
return;
- }
*base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
@@ -246,6 +235,33 @@ static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
}
}
+static void vlv_get_stolen_reserved(struct drm_i915_private *dev_priv,
+ resource_size_t *base,
+ resource_size_t *size)
+{
+ u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED);
+ resource_size_t stolen_top = dev_priv->dsm.end + 1;
+
+ DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = %08x\n", reg_val);
+
+ if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
+ return;
+
+ switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
+ default:
+ MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
+ case GEN7_STOLEN_RESERVED_1M:
+ *size = 1024 * 1024;
+ break;
+ }
+
+ /*
+ * On vlv, the ADDR_MASK portion is left as 0 and HW deduces the
+ * reserved location as (top - size).
+ */
+ *base = stolen_top - *size;
+}
+
static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
resource_size_t *base,
resource_size_t *size)
@@ -254,11 +270,8 @@ static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = %08x\n", reg_val);
- if ((reg_val & GEN6_STOLEN_RESERVED_ENABLE) == 0) {
- *base = 0;
- *size = 0;
+ if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
return;
- }
*base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
@@ -283,11 +296,8 @@ static void chv_get_stolen_reserved(struct drm_i915_private *dev_priv,
DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = %08x\n", reg_val);
- if ((reg_val & GEN6_STOLEN_RESERVED_ENABLE) == 0) {
- *base = 0;
- *size = 0;
+ if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
return;
- }
*base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
@@ -315,28 +325,18 @@ static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
resource_size_t *size)
{
u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED);
- resource_size_t stolen_top;
+ resource_size_t stolen_top = dev_priv->dsm.end + 1;
DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = %08x\n", reg_val);
- if ((reg_val & GEN6_STOLEN_RESERVED_ENABLE) == 0) {
- *base = 0;
- *size = 0;
+ if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
return;
- }
- stolen_top = dev_priv->dsm.end + 1;
+ if (!(reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK))
+ return;
*base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
-
- /* On these platforms, the register doesn't have a size field, so the
- * size is the distance between the base and the top of the stolen
- * memory. We also have the genuine case where base is zero and there's
- * nothing reserved. */
- if (*base == 0)
- *size = 0;
- else
- *size = stolen_top - *base;
+ *size = stolen_top - *base;
}
int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
@@ -369,7 +369,7 @@ int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
GEM_BUG_ON(dev_priv->dsm.end <= dev_priv->dsm.start);
stolen_top = dev_priv->dsm.end + 1;
- reserved_base = 0;
+ reserved_base = stolen_top;
reserved_size = 0;
switch (INTEL_GEN(dev_priv)) {
@@ -389,8 +389,12 @@ int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
&reserved_base, &reserved_size);
break;
case 7:
- gen7_get_stolen_reserved(dev_priv,
- &reserved_base, &reserved_size);
+ if (IS_VALLEYVIEW(dev_priv))
+ vlv_get_stolen_reserved(dev_priv,
+ &reserved_base, &reserved_size);
+ else
+ gen7_get_stolen_reserved(dev_priv,
+ &reserved_base, &reserved_size);
break;
default:
if (IS_LP(dev_priv))
@@ -402,11 +406,16 @@ int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
break;
}
- /* It is possible for the reserved base to be zero, but the register
- * field for size doesn't have a zero option. */
- if (reserved_base == 0) {
- reserved_size = 0;
+ /*
+ * Our expectation is that the reserved space is at the top of the
+ * stolen region and *never* at the bottom. If we see !reserved_base,
+ * it likely means we failed to read the registers correctly.
+ */
+ if (!reserved_base) {
+ DRM_ERROR("inconsistent reservation %pa + %pa; ignoring\n",
+ &reserved_base, &reserved_size);
reserved_base = stolen_top;
+ reserved_size = 0;
}
dev_priv->dsm_reserved =
--
2.16.2
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