drm/i915: Remove i915.enable_ppgtt override

Now that we are confident in providing full-ppgtt where supported,
remove the ability to override the context isolation.

v2: Remove faked aliasing-ppgtt for testing as it no longer is accepted.
v3: s/USES/HAS/ to match usage and reject attempts to load the module on
old GVT-g setups that do not provide support for full-ppgtt.
v4: Insulate ABI ppGTT values from our internal enum (later plans
involve moving ppGTT depth out of the enum, thus potentially breaking
ABI unless we document the current values).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Acked-by: Zhi Wang <zhi.a.wang@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180926201222.5643-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_drv.c

@@ -345,7 +345,7 @@ static int i915_getparam_ioctl(struct drm_device *dev, void *data,
 		value = HAS_WT(dev_priv);
 		break;
 	case I915_PARAM_HAS_ALIASING_PPGTT:
-		value = USES_PPGTT(dev_priv);
+		value = min_t(int, INTEL_PPGTT(dev_priv), I915_GEM_PPGTT_FULL);
 		break;
 	case I915_PARAM_HAS_SEMAPHORES:
 		value = HAS_LEGACY_SEMAPHORES(dev_priv);
@@ -1049,17 +1049,6 @@ static void i915_driver_cleanup_mmio(struct drm_i915_private *dev_priv)
 
 static void intel_sanitize_options(struct drm_i915_private *dev_priv)
 {
-	/*
-	 * i915.enable_ppgtt is read-only, so do an early pass to validate the
-	 * user's requested state against the hardware/driver capabilities.  We
-	 * do this now so that we can print out any log messages once rather
-	 * than every time we check intel_enable_ppgtt().
-	 */
-	i915_modparams.enable_ppgtt =
-		intel_sanitize_enable_ppgtt(dev_priv,
-					    i915_modparams.enable_ppgtt);
-	DRM_DEBUG_DRIVER("ppgtt mode: %i\n", i915_modparams.enable_ppgtt);
-
 	intel_gvt_sanitize_options(dev_priv);
 }
 
@@ -1374,6 +1363,15 @@ static int i915_driver_init_hw(struct drm_i915_private *dev_priv)
 
 	intel_device_info_runtime_init(mkwrite_device_info(dev_priv));
 
+	if (HAS_PPGTT(dev_priv)) {
+		if (intel_vgpu_active(dev_priv) &&
+		    !intel_vgpu_has_full_48bit_ppgtt(dev_priv)) {
+			i915_report_error(dev_priv,
+					  "incompatible vGPU found, support for isolated ppGTT required\n");
+			return -ENXIO;
+		}
+	}
+
 	intel_sanitize_options(dev_priv);
 
 	i915_perf_init(dev_priv);

drivers/gpu/drm/i915/i915_drv.h

@@ -2597,9 +2597,14 @@ intel_info(const struct drm_i915_private *dev_priv)
 
 #define HAS_EXECLISTS(dev_priv) HAS_LOGICAL_RING_CONTEXTS(dev_priv)
 
-#define USES_PPGTT(dev_priv)		(i915_modparams.enable_ppgtt)
-#define USES_FULL_PPGTT(dev_priv)	(i915_modparams.enable_ppgtt >= 2)
-#define USES_FULL_48BIT_PPGTT(dev_priv)	(i915_modparams.enable_ppgtt == 3)
+#define INTEL_PPGTT(dev_priv) (INTEL_INFO(dev_priv)->ppgtt)
+#define HAS_PPGTT(dev_priv) \
+	(INTEL_PPGTT(dev_priv) != INTEL_PPGTT_NONE)
+#define HAS_FULL_PPGTT(dev_priv) \
+	(INTEL_PPGTT(dev_priv) >= INTEL_PPGTT_FULL)
+#define HAS_FULL_48BIT_PPGTT(dev_priv)	\
+	(INTEL_PPGTT(dev_priv) >= INTEL_PPGTT_FULL_4LVL)
+
 #define HAS_PAGE_SIZES(dev_priv, sizes) ({ \
 	GEM_BUG_ON((sizes) == 0); \
 	((sizes) & ~(dev_priv)->info.page_sizes) == 0; \
@@ -2747,9 +2752,6 @@ intel_ggtt_update_needs_vtd_wa(struct drm_i915_private *dev_priv)
 	return IS_BROXTON(dev_priv) && intel_vtd_active();
 }
 
-int intel_sanitize_enable_ppgtt(struct drm_i915_private *dev_priv,
-				int enable_ppgtt);
-
 /* i915_drv.c */
 void __printf(3, 4)
 __i915_printk(struct drm_i915_private *dev_priv, const char *level,

drivers/gpu/drm/i915/i915_gem_context.c

@@ -414,7 +414,7 @@ i915_gem_create_context(struct drm_i915_private *dev_priv,
 	if (IS_ERR(ctx))
 		return ctx;
 
-	if (USES_FULL_PPGTT(dev_priv)) {
+	if (HAS_FULL_PPGTT(dev_priv)) {
 		struct i915_hw_ppgtt *ppgtt;
 
 		ppgtt = i915_ppgtt_create(dev_priv, file_priv);

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -133,55 +133,6 @@ static inline void i915_ggtt_invalidate(struct drm_i915_private *i915)
 	i915->ggtt.invalidate(i915);
 }
 
-int intel_sanitize_enable_ppgtt(struct drm_i915_private *dev_priv,
-			       	int enable_ppgtt)
-{
-	bool has_full_ppgtt;
-	bool has_full_48bit_ppgtt;
-
-	if (!dev_priv->info.has_aliasing_ppgtt)
-		return 0;
-
-	has_full_ppgtt = dev_priv->info.has_full_ppgtt;
-	has_full_48bit_ppgtt = dev_priv->info.has_full_48bit_ppgtt;
-
-	if (intel_vgpu_active(dev_priv)) {
-		/* GVT-g has no support for 32bit ppgtt */
-		has_full_ppgtt = false;
-		has_full_48bit_ppgtt = intel_vgpu_has_full_48bit_ppgtt(dev_priv);
-	}
-
-	/*
-	 * We don't allow disabling PPGTT for gen8+ as it's a requirement for
-	 * execlists, the sole mechanism available to submit work.
-	 */
-	if (enable_ppgtt == 0 && !HAS_EXECLISTS(dev_priv))
-		return 0;
-
-	if (enable_ppgtt == 1)
-		return 1;
-
-	if (enable_ppgtt == 2 && has_full_ppgtt)
-		return 2;
-
-	if (enable_ppgtt == 3 && has_full_48bit_ppgtt)
-		return 3;
-
-	/* Disable ppgtt on SNB if VT-d is on. */
-	if (IS_GEN6(dev_priv) && intel_vtd_active()) {
-		DRM_INFO("Disabling PPGTT because VT-d is on\n");
-		return 0;
-	}
-
-	if (has_full_48bit_ppgtt)
-		return 3;
-
-	if (has_full_ppgtt)
-		return 2;
-
-	return 1;
-}
-
 static int ppgtt_bind_vma(struct i915_vma *vma,
 			  enum i915_cache_level cache_level,
 			  u32 unused)
@@ -1647,7 +1598,7 @@ 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 = USES_FULL_48BIT_PPGTT(i915) ?
+	ppgtt->vm.total = HAS_FULL_48BIT_PPGTT(i915) ?
 		1ULL << 48 :
 		1ULL << 32;
 
@@ -1782,19 +1733,6 @@ static inline void gen6_write_pde(const struct gen6_hw_ppgtt *ppgtt,
 		  ppgtt->pd_addr + pde);
 }
 
-static void gen8_ppgtt_enable(struct drm_i915_private *dev_priv)
-{
-	struct intel_engine_cs *engine;
-	enum intel_engine_id id;
-
-	for_each_engine(engine, dev_priv, id) {
-		u32 four_level = USES_FULL_48BIT_PPGTT(dev_priv) ?
-				 GEN8_GFX_PPGTT_48B : 0;
-		I915_WRITE(RING_MODE_GEN7(engine),
-			   _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE | four_level));
-	}
-}
-
 static void gen7_ppgtt_enable(struct drm_i915_private *dev_priv)
 {
 	struct intel_engine_cs *engine;
@@ -1834,7 +1772,8 @@ static void gen6_ppgtt_enable(struct drm_i915_private *dev_priv)
 	ecochk = I915_READ(GAM_ECOCHK);
 	I915_WRITE(GAM_ECOCHK, ecochk | ECOCHK_SNB_BIT | ECOCHK_PPGTT_CACHE64B);
 
-	I915_WRITE(GFX_MODE, _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE));
+	if (HAS_PPGTT(dev_priv)) /* may be disabled for VT-d */
+		I915_WRITE(GFX_MODE, _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE));
 }
 
 /* PPGTT support for Sandybdrige/Gen6 and later */
@@ -2237,23 +2176,10 @@ int i915_ppgtt_init_hw(struct drm_i915_private *dev_priv)
 {
 	gtt_write_workarounds(dev_priv);
 
-	/* In the case of execlists, PPGTT is enabled by the context descriptor
-	 * and the PDPs are contained within the context itself.  We don't
-	 * need to do anything here. */
-	if (HAS_LOGICAL_RING_CONTEXTS(dev_priv))
-		return 0;
-
-	if (!USES_PPGTT(dev_priv))
-		return 0;
-
 	if (IS_GEN6(dev_priv))
 		gen6_ppgtt_enable(dev_priv);
 	else if (IS_GEN7(dev_priv))
 		gen7_ppgtt_enable(dev_priv);
-	else if (INTEL_GEN(dev_priv) >= 8)
-		gen8_ppgtt_enable(dev_priv);
-	else
-		MISSING_CASE(INTEL_GEN(dev_priv));
 
 	return 0;
 }
@@ -2952,7 +2878,7 @@ int i915_gem_init_ggtt(struct drm_i915_private *dev_priv)
 	/* And finally clear the reserved guard page */
 	ggtt->vm.clear_range(&ggtt->vm, ggtt->vm.total - PAGE_SIZE, PAGE_SIZE);
 
-	if (USES_PPGTT(dev_priv) && !USES_FULL_PPGTT(dev_priv)) {
+	if (INTEL_PPGTT(dev_priv) == INTEL_PPGTT_ALIASING) {
 		ret = i915_gem_init_aliasing_ppgtt(dev_priv);
 		if (ret)
 			goto err;
@@ -3275,7 +3201,7 @@ static void bdw_setup_private_ppat(struct intel_ppat *ppat)
 	ppat->match = bdw_private_pat_match;
 	ppat->clear_value = GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(3);
 
-	if (!USES_PPGTT(ppat->i915)) {
+	if (!HAS_PPGTT(ppat->i915)) {
 		/* Spec: "For GGTT, there is NO pat_sel[2:0] from the entry,
 		 * so RTL will always use the value corresponding to
 		 * pat_sel = 000".
@@ -3402,7 +3328,7 @@ static int gen8_gmch_probe(struct i915_ggtt *ggtt)
 	ggtt->vm.cleanup = gen6_gmch_remove;
 	ggtt->vm.insert_page = gen8_ggtt_insert_page;
 	ggtt->vm.clear_range = nop_clear_range;
-	if (!USES_FULL_PPGTT(dev_priv) || intel_scanout_needs_vtd_wa(dev_priv))
+	if (intel_scanout_needs_vtd_wa(dev_priv))
 		ggtt->vm.clear_range = gen8_ggtt_clear_range;
 
 	ggtt->vm.insert_entries = gen8_ggtt_insert_entries;
@@ -3609,7 +3535,7 @@ int i915_ggtt_init_hw(struct drm_i915_private *dev_priv)
 	/* Only VLV supports read-only GGTT mappings */
 	ggtt->vm.has_read_only = IS_VALLEYVIEW(dev_priv);
 
-	if (!HAS_LLC(dev_priv) && !USES_PPGTT(dev_priv))
+	if (!HAS_LLC(dev_priv) && !HAS_PPGTT(dev_priv))
 		ggtt->vm.mm.color_adjust = i915_gtt_color_adjust;
 	mutex_unlock(&dev_priv->drm.struct_mutex);
 

drivers/gpu/drm/i915/i915_gpu_error.c

@@ -474,7 +474,7 @@ static void error_print_engine(struct drm_i915_error_state_buf *m,
 			err_printf(m, "  SYNC_2: 0x%08x\n",
 				   ee->semaphore_mboxes[2]);
 	}
-	if (USES_PPGTT(m->i915)) {
+	if (HAS_PPGTT(m->i915)) {
 		err_printf(m, "  GFX_MODE: 0x%08x\n", ee->vm_info.gfx_mode);
 
 		if (INTEL_GEN(m->i915) >= 8) {
@@ -1230,7 +1230,7 @@ static void error_record_engine_registers(struct i915_gpu_state *error,
 	ee->reset_count = i915_reset_engine_count(&dev_priv->gpu_error,
 						  engine);
 
-	if (USES_PPGTT(dev_priv)) {
+	if (HAS_PPGTT(dev_priv)) {
 		int i;
 
 		ee->vm_info.gfx_mode = I915_READ(RING_MODE_GEN7(engine));

drivers/gpu/drm/i915/i915_params.c

@@ -82,10 +82,6 @@ i915_param_named_unsafe(enable_hangcheck, bool, 0644,
 	"WARNING: Disabling this can cause system wide hangs. "
 	"(default: true)");
 
-i915_param_named_unsafe(enable_ppgtt, int, 0400,
-	"Override PPGTT usage. "
-	"(-1=auto [default], 0=disabled, 1=aliasing, 2=full, 3=full with extended address space)");
-
 i915_param_named_unsafe(enable_psr, int, 0600,
 	"Enable PSR "
 	"(0=disabled, 1=enabled) "

drivers/gpu/drm/i915/i915_params.h

@@ -41,7 +41,6 @@ struct drm_printer;
 	param(int, vbt_sdvo_panel_type, -1) \
 	param(int, enable_dc, -1) \
 	param(int, enable_fbc, -1) \
-	param(int, enable_ppgtt, -1) \
 	param(int, enable_psr, -1) \
 	param(int, disable_power_well, -1) \
 	param(int, enable_ips, 1) \

drivers/gpu/drm/i915/i915_pci.c

@@ -252,7 +252,7 @@ static const struct intel_device_info intel_ironlake_m_info = {
 	.has_llc = 1, \
 	.has_rc6 = 1, \
 	.has_rc6p = 1, \
-	.has_aliasing_ppgtt = 1, \
+	.ppgtt = INTEL_PPGTT_ALIASING, \
 	GEN_DEFAULT_PIPEOFFSETS, \
 	GEN_DEFAULT_PAGE_SIZES, \
 	CURSOR_OFFSETS
@@ -297,8 +297,7 @@ static const struct intel_device_info intel_sandybridge_m_gt2_info = {
 	.has_llc = 1, \
 	.has_rc6 = 1, \
 	.has_rc6p = 1, \
-	.has_aliasing_ppgtt = 1, \
-	.has_full_ppgtt = 1, \
+	.ppgtt = INTEL_PPGTT_FULL, \
 	GEN_DEFAULT_PIPEOFFSETS, \
 	GEN_DEFAULT_PAGE_SIZES, \
 	IVB_CURSOR_OFFSETS
@@ -351,8 +350,7 @@ static const struct intel_device_info intel_valleyview_info = {
 	.has_rc6 = 1,
 	.has_gmch_display = 1,
 	.has_hotplug = 1,
-	.has_aliasing_ppgtt = 1,
-	.has_full_ppgtt = 1,
+	.ppgtt = INTEL_PPGTT_FULL,
 	.has_snoop = true,
 	.has_coherent_ggtt = false,
 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING,
@@ -399,7 +397,7 @@ 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, \
-	.has_full_48bit_ppgtt = 1, \
+	.ppgtt = INTEL_PPGTT_FULL_4LVL, \
 	.has_64bit_reloc = 1, \
 	.has_reset_engine = 1
 
@@ -443,8 +441,7 @@ static const struct intel_device_info intel_cherryview_info = {
 	.has_rc6 = 1,
 	.has_logical_ring_contexts = 1,
 	.has_gmch_display = 1,
-	.has_aliasing_ppgtt = 1,
-	.has_full_ppgtt = 1,
+	.ppgtt = INTEL_PPGTT_FULL,
 	.has_reset_engine = 1,
 	.has_snoop = true,
 	.has_coherent_ggtt = false,
@@ -520,9 +517,7 @@ static const struct intel_device_info intel_skylake_gt4_info = {
 	.has_logical_ring_contexts = 1, \
 	.has_logical_ring_preemption = 1, \
 	.has_guc = 1, \
-	.has_aliasing_ppgtt = 1, \
-	.has_full_ppgtt = 1, \
-	.has_full_48bit_ppgtt = 1, \
+	.ppgtt = INTEL_PPGTT_FULL_4LVL, \
 	.has_reset_engine = 1, \
 	.has_snoop = true, \
 	.has_coherent_ggtt = false, \

drivers/gpu/drm/i915/intel_device_info.c

@@ -850,6 +850,11 @@ void intel_device_info_runtime_init(struct intel_device_info *info)
 	else if (INTEL_GEN(dev_priv) >= 11)
 		gen11_sseu_info_init(dev_priv);
 
+	if (IS_GEN6(dev_priv) && intel_vtd_active()) {
+		DRM_INFO("Disabling ppGTT for VT-d support\n");
+		info->ppgtt = INTEL_PPGTT_NONE;
+	}
+
 	/* Initialize command stream timestamp frequency */
 	info->cs_timestamp_frequency_khz = read_timestamp_frequency(dev_priv);
 }

drivers/gpu/drm/i915/intel_device_info.h

@@ -25,6 +25,8 @@
 #ifndef _INTEL_DEVICE_INFO_H_
 #define _INTEL_DEVICE_INFO_H_
 
+#include <uapi/drm/i915_drm.h>
+
 #include "intel_display.h"
 
 struct drm_printer;
@@ -74,21 +76,25 @@ enum intel_platform {
 	INTEL_MAX_PLATFORMS
 };
 
+enum intel_ppgtt {
+	INTEL_PPGTT_NONE = I915_GEM_PPGTT_NONE,
+	INTEL_PPGTT_ALIASING = I915_GEM_PPGTT_ALIASING,
+	INTEL_PPGTT_FULL = I915_GEM_PPGTT_FULL,
+	INTEL_PPGTT_FULL_4LVL,
+};
+
 #define DEV_INFO_FOR_EACH_FLAG(func) \
 	func(is_mobile); \
 	func(is_lp); \
 	func(is_alpha_support); \
 	/* Keep has_* in alphabetical order */ \
 	func(has_64bit_reloc); \
-	func(has_aliasing_ppgtt); \
 	func(has_csr); \
 	func(has_ddi); \
 	func(has_dp_mst); \
 	func(has_reset_engine); \
 	func(has_fbc); \
 	func(has_fpga_dbg); \
-	func(has_full_ppgtt); \
-	func(has_full_48bit_ppgtt); \
 	func(has_gmch_display); \
 	func(has_guc); \
 	func(has_guc_ct); \
@@ -154,6 +160,7 @@ struct intel_device_info {
 	enum intel_platform platform;
 	u32 platform_mask;
 
+	enum intel_ppgtt ppgtt;
 	unsigned int page_sizes; /* page sizes supported by the HW */
 
 	u32 display_mmio_offset;