drm/i915: Record platform specific ppGTT size in intel_device_info

As the maximum addressable bits is determined by platform, record that
information in our static chipset tables. This has the advantage of
being clearly recorded in our capability dumps for dmesg, debugfs and
error states.

Based on a patch by Bob Paauwe.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Bob Paauwe <bob.j.paauwe@intel.com>
Cc: Matthew Auld <matthew.william.auld@gmail.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190314223839.28258-2-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_drv.h

@@ -2452,7 +2452,7 @@ static inline unsigned int i915_sg_segment_size(void)
 
 #define HAS_EXECLISTS(dev_priv) HAS_LOGICAL_RING_CONTEXTS(dev_priv)
 
-#define INTEL_PPGTT(dev_priv) (INTEL_INFO(dev_priv)->ppgtt)
+#define INTEL_PPGTT(dev_priv) (INTEL_INFO(dev_priv)->ppgtt_type)
 #define HAS_PPGTT(dev_priv) \
 	(INTEL_PPGTT(dev_priv) != INTEL_PPGTT_NONE)
 #define HAS_FULL_PPGTT(dev_priv) \

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -1538,10 +1538,7 @@ static struct i915_hw_ppgtt *gen8_ppgtt_create(struct drm_i915_private *i915)
 
 	ppgtt->vm.i915 = i915;
 	ppgtt->vm.dma = &i915->drm.pdev->dev;
-
-	ppgtt->vm.total = HAS_FULL_48BIT_PPGTT(i915) ?
-		1ULL << 48 :
-		1ULL << 32;
+	ppgtt->vm.total = BIT_ULL(INTEL_INFO(i915)->ppgtt_size);
 
 	/* From bdw, there is support for read-only pages in the PPGTT. */
 	ppgtt->vm.has_read_only = true;
@@ -1991,8 +1988,7 @@ static struct i915_hw_ppgtt *gen6_ppgtt_create(struct drm_i915_private *i915)
 
 	ppgtt->base.vm.i915 = i915;
 	ppgtt->base.vm.dma = &i915->drm.pdev->dev;
-
-	ppgtt->base.vm.total = I915_PDES * GEN6_PTES * I915_GTT_PAGE_SIZE;
+	ppgtt->base.vm.total = BIT_ULL(INTEL_INFO(i915)->ppgtt_size);
 
 	i915_address_space_init(&ppgtt->base.vm, VM_CLASS_PPGTT);
 

drivers/gpu/drm/i915/i915_pci.c

@@ -349,7 +349,8 @@ static const struct intel_device_info intel_ironlake_m_info = {
 	.has_llc = 1, \
 	.has_rc6 = 1, \
 	.has_rc6p = 1, \
-	.ppgtt = INTEL_PPGTT_ALIASING, \
+	.ppgtt_type = INTEL_PPGTT_ALIASING, \
+	.ppgtt_size = 31, \
 	I9XX_PIPE_OFFSETS, \
 	I9XX_CURSOR_OFFSETS, \
 	GEN_DEFAULT_PAGE_SIZES
@@ -394,7 +395,8 @@ static const struct intel_device_info intel_sandybridge_m_gt2_info = {
 	.has_llc = 1, \
 	.has_rc6 = 1, \
 	.has_rc6p = 1, \
-	.ppgtt = INTEL_PPGTT_FULL, \
+	.ppgtt_type = INTEL_PPGTT_FULL, \
+	.ppgtt_size = 31, \
 	IVB_PIPE_OFFSETS, \
 	IVB_CURSOR_OFFSETS, \
 	GEN_DEFAULT_PAGE_SIZES
@@ -447,7 +449,8 @@ static const struct intel_device_info intel_valleyview_info = {
 	.has_rc6 = 1,
 	.display.has_gmch = 1,
 	.display.has_hotplug = 1,
-	.ppgtt = INTEL_PPGTT_FULL,
+	.ppgtt_type = INTEL_PPGTT_FULL,
+	.ppgtt_size = 31,
 	.has_snoop = true,
 	.has_coherent_ggtt = false,
 	.engine_mask = BIT(RCS0) | BIT(VCS0) | BIT(BCS0),
@@ -495,7 +498,8 @@ static const struct intel_device_info intel_haswell_gt3_info = {
 	.page_sizes = I915_GTT_PAGE_SIZE_4K | \
 		      I915_GTT_PAGE_SIZE_2M, \
 	.has_logical_ring_contexts = 1, \
-	.ppgtt = INTEL_PPGTT_FULL_4LVL, \
+	.ppgtt_type = INTEL_PPGTT_FULL_4LVL, \
+	.ppgtt_size = 48, \
 	.has_64bit_reloc = 1, \
 	.has_reset_engine = 1
 
@@ -540,7 +544,8 @@ static const struct intel_device_info intel_cherryview_info = {
 	.has_rc6 = 1,
 	.has_logical_ring_contexts = 1,
 	.display.has_gmch = 1,
-	.ppgtt = INTEL_PPGTT_FULL,
+	.ppgtt_type = INTEL_PPGTT_FULL,
+	.ppgtt_size = 32,
 	.has_reset_engine = 1,
 	.has_snoop = true,
 	.has_coherent_ggtt = false,
@@ -616,7 +621,8 @@ static const struct intel_device_info intel_skylake_gt4_info = {
 	.has_logical_ring_contexts = 1, \
 	.has_logical_ring_preemption = 1, \
 	.has_guc = 1, \
-	.ppgtt = INTEL_PPGTT_FULL_4LVL, \
+	.ppgtt_type = INTEL_PPGTT_FULL_4LVL, \
+	.ppgtt_size = 48, \
 	.has_reset_engine = 1, \
 	.has_snoop = true, \
 	.has_coherent_ggtt = false, \

drivers/gpu/drm/i915/intel_device_info.c

@@ -844,7 +844,7 @@ void intel_device_info_runtime_init(struct drm_i915_private *dev_priv)
 
 	if (IS_GEN(dev_priv, 6) && intel_vtd_active()) {
 		DRM_INFO("Disabling ppGTT for VT-d support\n");
-		info->ppgtt = INTEL_PPGTT_NONE;
+		info->ppgtt_type = INTEL_PPGTT_NONE;
 	}
 
 	/* Initialize command stream timestamp frequency */

drivers/gpu/drm/i915/intel_device_info.h

@@ -76,7 +76,7 @@ enum intel_platform {
 	INTEL_MAX_PLATFORMS
 };
 
-enum intel_ppgtt {
+enum intel_ppgtt_type {
 	INTEL_PPGTT_NONE = I915_GEM_PPGTT_NONE,
 	INTEL_PPGTT_ALIASING = I915_GEM_PPGTT_ALIASING,
 	INTEL_PPGTT_FULL = I915_GEM_PPGTT_FULL,
@@ -162,7 +162,9 @@ struct intel_device_info {
 	enum intel_platform platform;
 	u32 platform_mask;
 
-	enum intel_ppgtt ppgtt;
+	enum intel_ppgtt_type ppgtt_type;
+	unsigned int ppgtt_size; /* log2, e.g. 31/32/48 bits */
+
 	unsigned int page_sizes; /* page sizes supported by the HW */
 
 	u32 display_mmio_offset;

drivers/gpu/drm/i915/selftests/huge_pages.c

@@ -1709,7 +1709,8 @@ int i915_gem_huge_page_mock_selftests(void)
 		return -ENOMEM;
 
 	/* Pretend to be a device which supports the 48b PPGTT */
-	mkwrite_device_info(dev_priv)->ppgtt = INTEL_PPGTT_FULL_4LVL;
+	mkwrite_device_info(dev_priv)->ppgtt_type = INTEL_PPGTT_FULL_4LVL;
+	mkwrite_device_info(dev_priv)->ppgtt_size = 48;
 
 	mutex_lock(&dev_priv->drm.struct_mutex);
 	ppgtt = i915_ppgtt_create(dev_priv, ERR_PTR(-ENODEV));