From db7fb60593e42824ea217ff8ed14b74376ac98c8 Mon Sep 17 00:00:00 2001 From: Ville Syrjälä Date: Thu, 2 Nov 2017 17:17:35 +0200 Subject: drm/i915: Check if the stolen memory "reserved" area is enabled or not MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20171102151737.23336-1-ville.syrjala@linux.intel.com Reviewed-by: Paulo Zanoni --- drivers/gpu/drm/i915/i915_gem_stolen.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) (limited to 'drivers/gpu/drm/i915/i915_gem_stolen.c') 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; -- cgit v1.2.3