drm/i915: Treat stolen memory as DMA addresses

The conversion of stolen to use phys_addr_t (from essentially u32)
sparked an interesting discussion. We treat stolen memory as only
accessible from the GPU (the DMA device) - an attempt to use it from the
CPU will generate a MCE on gen6 onwards, although it is in theory a
physical address that can be dereferenced from the CPU as demonstrated
by earlier generations. As such, using phys_addr_t has the wrong
connotations and as we pass the address into the DMA device via
dma_addr_t (through the scatterlists used to program the GTT entries),
we should treat it as dma_addr_t throughout.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170127165531.28135-1-chris@chris-wilson.co.uk
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 448e5d8..15f0fc4 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1461,7 +1461,7 @@ struct i915_gem_mm {
        struct work_struct free_work;
 
        /** Usable portion of the GTT for GEM */
-       phys_addr_t stolen_base; /* limited to low memory (32-bit) */
+       dma_addr_t stolen_base; /* limited to low memory (32-bit) */
 
        /** PPGTT used for aliasing the PPGTT with the GTT */
        struct i915_hw_ppgtt *aliasing_ppgtt;

diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index 729dba0..a75de8c 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -79,12 +79,12 @@ void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
        mutex_unlock(&dev_priv->mm.stolen_lock);
 }
 
-static phys_addr_t i915_stolen_to_physical(struct drm_i915_private *dev_priv)
+static dma_addr_t i915_stolen_to_dma(struct drm_i915_private *dev_priv)
 {
        struct pci_dev *pdev = dev_priv->drm.pdev;
        struct i915_ggtt *ggtt = &dev_priv->ggtt;
        struct resource *r;
-       phys_addr_t base;
+       dma_addr_t base;
 
        /* Almost universally we can find the Graphics Base of Stolen Memory
         * at register BSM (0x5c) in the igfx configuration space. On a few
@@ -196,7 +196,7 @@ static phys_addr_t i915_stolen_to_physical(struct drm_i915_private *dev_priv)
        if (INTEL_GEN(dev_priv) <= 4 &&
            !IS_G33(dev_priv) && !IS_PINEVIEW(dev_priv) && !IS_G4X(dev_priv)) {
                struct {
-                       phys_addr_t start, end;
+                       dma_addr_t start, end;
                } stolen[2] = {
                        { .start = base, .end = base + ggtt->stolen_size, },
                        { .start = base, .end = base + ggtt->stolen_size, },
@@ -228,12 +228,12 @@ static phys_addr_t i915_stolen_to_physical(struct drm_i915_private *dev_priv)
 
                if (stolen[0].start != stolen[1].start ||
                    stolen[0].end != stolen[1].end) {
-                       phys_addr_t end = base + ggtt->stolen_size - 1;
+                       dma_addr_t end = base + ggtt->stolen_size - 1;
 
                        DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
                                      (unsigned long long)ggtt_start,
                                      (unsigned long long)ggtt_end - 1);
-                       DRM_DEBUG_KMS("Stolen memory adjusted to %pa - %pa\n",
+                       DRM_DEBUG_KMS("Stolen memory adjusted to %pad - %pad\n",
                                      &base, &end);
                }
        }
@@ -263,9 +263,9 @@ static phys_addr_t i915_stolen_to_physical(struct drm_i915_private *dev_priv)
                 * range. Apparently this works.
                 */
                if (r == NULL && !IS_GEN3(dev_priv)) {
-                       phys_addr_t end = base + ggtt->stolen_size;
+                       dma_addr_t end = base + ggtt->stolen_size;
 
-                       DRM_ERROR("conflict detected with stolen region: [%pa - %pa]\n",
+                       DRM_ERROR("conflict detected with stolen region: [%pad - %pad]\n",
                                  &base, &end);
                        base = 0;
                }
@@ -285,13 +285,13 @@ void i915_gem_cleanup_stolen(struct drm_device *dev)
 }
 
 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
-                                   phys_addr_t *base, u32 *size)
+                                   dma_addr_t *base, u32 *size)
 {
        struct i915_ggtt *ggtt = &dev_priv->ggtt;
        uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
                                     CTG_STOLEN_RESERVED :
                                     ELK_STOLEN_RESERVED);
-       phys_addr_t stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
+       dma_addr_t stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 
        *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
 
@@ -308,7 +308,7 @@ static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
 }
 
 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
-                                    phys_addr_t *base, u32 *size)
+                                    dma_addr_t *base, u32 *size)
 {
        uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 
@@ -334,7 +334,7 @@ static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
 }
 
 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
-                                    phys_addr_t *base, u32 *size)
+                                    dma_addr_t *base, u32 *size)
 {
        uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 
@@ -354,7 +354,7 @@ static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
 }
 
 static void chv_get_stolen_reserved(struct drm_i915_private *dev_priv,
-                                   phys_addr_t *base, u32 *size)
+                                   dma_addr_t *base, u32 *size)
 {
        uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 
@@ -380,11 +380,11 @@ static void chv_get_stolen_reserved(struct drm_i915_private *dev_priv,
 }
 
 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
-                                   phys_addr_t *base, u32 *size)
+                                   dma_addr_t *base, u32 *size)
 {
        struct i915_ggtt *ggtt = &dev_priv->ggtt;
        uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
-       phys_addr_t stolen_top;
+       dma_addr_t stolen_top;
 
        stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 
@@ -403,7 +403,7 @@ static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
 int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
 {
        struct i915_ggtt *ggtt = &dev_priv->ggtt;
-       phys_addr_t reserved_base, stolen_top;
+       dma_addr_t reserved_base, stolen_top;
        u32 reserved_total, reserved_size;
        u32 stolen_usable_start;
 
@@ -419,7 +419,7 @@ int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
        if (ggtt->stolen_size == 0)
                return 0;
 
-       dev_priv->mm.stolen_base = i915_stolen_to_physical(dev_priv);
+       dev_priv->mm.stolen_base = i915_stolen_to_dma(dev_priv);
        if (dev_priv->mm.stolen_base == 0)
                return 0;
 
@@ -468,8 +468,8 @@ int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
 
        if (reserved_base < dev_priv->mm.stolen_base ||
            reserved_base + reserved_size > stolen_top) {
-               phys_addr_t reserved_top = reserved_base + reserved_size;
-               DRM_DEBUG_KMS("Stolen reserved area [%pa - %pa] outside stolen memory [%pa - %pa]\n",
+               dma_addr_t reserved_top = reserved_base + reserved_size;
+               DRM_DEBUG_KMS("Stolen reserved area [%pad - %pad] outside stolen memory [%pad - %pad]\n",
                              &reserved_base, &reserved_top,
                              &dev_priv->mm.stolen_base, &stolen_top);
                return 0;