diff options
| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2017-11-02 18:17:35 +0300 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2017-11-15 19:39:26 +0300 |
| commit | db7fb60593e42824ea217ff8ed14b74376ac98c8 (patch) | |
| tree | 74741a53bcb9dc0ff66e1c4162e733c186461d12 /drivers/gpu/drm/i915/i915_gem_stolen.c | |
| parent | 764b9f2c4d252fd893a07b39b4ab14ae8044c9cb (diff) | |
| download | linux-db7fb60593e42824ea217ff8ed14b74376ac98c8.tar.xz | |
drm/i915: Check if the stolen memory "reserved" area is enabled or not
Apparently there are some machines that put semi-sensible looking values
into the stolen "reserved" base and size, except those values are actually
outside the stolen memory. There is a bit in the register which
supposedly could tell us whether the reserved area is even enabled or
not. Let's check for that before we go trusting the base and size.
Cc: Tomi Sarvela <tomi.p.sarvela@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171102151737.23336-1-ville.syrjala@linux.intel.com
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_stolen.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_stolen.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c index 03e7abc7e043..44a5dbc8c23b 100644 --- a/drivers/gpu/drm/i915/i915_gem_stolen.c +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c @@ -294,6 +294,12 @@ static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv, ELK_STOLEN_RESERVED); dma_addr_t stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size; + if ((reg_val & G4X_STOLEN_RESERVED_ENABLE) == 0) { + *base = 0; + *size = 0; + return; + } + *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16; WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base); @@ -313,6 +319,12 @@ static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv, { uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); + if ((reg_val & GEN6_STOLEN_RESERVED_ENABLE) == 0) { + *base = 0; + *size = 0; + return; + } + *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) { @@ -339,6 +351,12 @@ static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv, { uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); + if ((reg_val & GEN6_STOLEN_RESERVED_ENABLE) == 0) { + *base = 0; + *size = 0; + return; + } + *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK; switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) { @@ -359,6 +377,12 @@ static void chv_get_stolen_reserved(struct drm_i915_private *dev_priv, { uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); + if ((reg_val & GEN6_STOLEN_RESERVED_ENABLE) == 0) { + *base = 0; + *size = 0; + return; + } + *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) { @@ -387,6 +411,12 @@ static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv, uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); dma_addr_t stolen_top; + if ((reg_val & GEN6_STOLEN_RESERVED_ENABLE) == 0) { + *base = 0; + *size = 0; + return; + } + stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size; *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; |