Revert "drm/i915: Introduce private PAT management"

This reverts commit 4395890a.

It's been over a year since this was merged, and the actual users of
intel_ppat_get / intel_ppat_put never materialized.

Time to remove it!

v2: Unbreak suspend (Chris)
v3: Rebase, drop fixes tag to avoid confusion
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Zhi Wang <zhi.a.wang@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190702113149.21200-1-michal.winiarski@intel.com

drivers/gpu/drm/i915/i915_drv.h

@@ -1489,8 +1489,6 @@ struct drm_i915_private {
 	DECLARE_HASHTABLE(mm_structs, 7);
 	struct mutex mm_lock;
 
-	struct intel_ppat ppat;
-
 	/* Kernel Modesetting */
 
 	struct intel_crtc *plane_to_crtc_mapping[I915_MAX_PIPES];

drivers/gpu/drm/i915/i915_gem_gtt.h

@@ -160,11 +160,6 @@ typedef u64 gen8_ppgtt_pml4e_t;
 #define GEN8_PPAT_ELLC_OVERRIDE		(0<<2)
 #define GEN8_PPAT(i, x)			((u64)(x) << ((i) * 8))
 
-#define GEN8_PPAT_GET_CA(x) ((x) & 3)
-#define GEN8_PPAT_GET_TC(x) ((x) & (3 << 2))
-#define GEN8_PPAT_GET_AGE(x) ((x) & (3 << 4))
-#define CHV_PPAT_GET_SNOOP(x) ((x) & (1 << 6))
-
 #define GEN8_PDE_IPS_64K BIT(11)
 #define GEN8_PDE_PS_2M   BIT(7)
 
@@ -619,37 +614,6 @@ i915_vm_to_ppgtt(struct i915_address_space *vm)
 	return container_of(vm, struct i915_ppgtt, vm);
 }
 
-#define INTEL_MAX_PPAT_ENTRIES 8
-#define INTEL_PPAT_PERFECT_MATCH (~0U)
-
-struct intel_ppat;
-
-struct intel_ppat_entry {
-	struct intel_ppat *ppat;
-	struct kref ref;
-	u8 value;
-};
-
-struct intel_ppat {
-	struct intel_ppat_entry entries[INTEL_MAX_PPAT_ENTRIES];
-	DECLARE_BITMAP(used, INTEL_MAX_PPAT_ENTRIES);
-	DECLARE_BITMAP(dirty, INTEL_MAX_PPAT_ENTRIES);
-	unsigned int max_entries;
-	u8 clear_value;
-	/*
-	 * Return a score to show how two PPAT values match,
-	 * a INTEL_PPAT_PERFECT_MATCH indicates a perfect match
-	 */
-	unsigned int (*match)(u8 src, u8 dst);
-	void (*update_hw)(struct drm_i915_private *i915);
-
-	struct drm_i915_private *i915;
-};
-
-const struct intel_ppat_entry *
-intel_ppat_get(struct drm_i915_private *i915, u8 value);
-void intel_ppat_put(const struct intel_ppat_entry *entry);
-
 int i915_ggtt_probe_hw(struct drm_i915_private *dev_priv);
 int i915_ggtt_init_hw(struct drm_i915_private *dev_priv);
 int i915_ggtt_enable_hw(struct drm_i915_private *dev_priv);