drm/i915: Only force GGTT coherency w/a on required chipsets

Not all chipsets have an internal buffer delaying the visibility of
writes via the GGTT being visible by other physical paths, but we use a
very heavy workaround for all. We only need to apply that workarounds to
the chipsets we know suffer from the delay and the resulting coherency
issue.

Similarly, the same inconsistent coherency fouls up our ABI promise that
a write into a mmap_gtt is immediately visible to others. Since the HW
has made that a lie, let userspace know when that contract is broken.
(Not that userspace would want to use mmap_gtt on those chipsets for
other performance reasons...)

Testcase: igt/drv_selftest/live_coherency
Testcase: igt/gem_mmap_gtt/coherency
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100587
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Tomasz Lis <tomasz.lis@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180720101910.11153-1-chris@chris-wilson.co.uk

4 files changed, 19 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 343e79a44abd..23e9a86cbc2a 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -441,6 +441,9 @@ static int i915_getparam_ioctl(struct drm_device *dev, void *data,
 	case I915_PARAM_CS_TIMESTAMP_FREQUENCY:
 		value = 1000 * INTEL_INFO(dev_priv)->cs_timestamp_frequency_khz;
 		break;
+	case I915_PARAM_MMAP_GTT_COHERENT:
+		value = INTEL_INFO(dev_priv)->has_coherent_ggtt;
+		break;
 	default:
 		DRM_DEBUG("Unknown parameter %d\n", param->param);
 		return -EINVAL;
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index fcc73a6ab503..8b52cb768a67 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -802,6 +802,11 @@ void i915_gem_flush_ggtt_writes(struct drm_i915_private *dev_priv)
 	 * that was!).
 	 */
 
+	wmb();
+
+	if (INTEL_INFO(dev_priv)->has_coherent_ggtt)
+		return;
+
 	i915_gem_chipset_flush(dev_priv);
 
 	intel_runtime_pm_get(dev_priv);
diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index 6a4d1388ad2d..e443fe44da3a 100644
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -74,6 +74,7 @@
 	.unfenced_needs_alignment = 1, \
 	.ring_mask = RENDER_RING, \
 	.has_snoop = true, \
+	.has_coherent_ggtt = false, \
 	GEN_DEFAULT_PIPEOFFSETS, \
 	GEN_DEFAULT_PAGE_SIZES, \
 	CURSOR_OFFSETS
@@ -110,6 +111,7 @@ static const struct intel_device_info intel_i865g_info = {
 	.has_gmch_display = 1, \
 	.ring_mask = RENDER_RING, \
 	.has_snoop = true, \
+	.has_coherent_ggtt = true, \
 	GEN_DEFAULT_PIPEOFFSETS, \
 	GEN_DEFAULT_PAGE_SIZES, \
 	CURSOR_OFFSETS
@@ -117,6 +119,7 @@ static const struct intel_device_info intel_i865g_info = {
 static const struct intel_device_info intel_i915g_info = {
 	GEN3_FEATURES,
 	PLATFORM(INTEL_I915G),
+	.has_coherent_ggtt = false,
 	.cursor_needs_physical = 1,
 	.has_overlay = 1, .overlay_needs_physical = 1,
 	.hws_needs_physical = 1,
@@ -178,6 +181,7 @@ static const struct intel_device_info intel_pineview_info = {
 	.has_gmch_display = 1, \
 	.ring_mask = RENDER_RING, \
 	.has_snoop = true, \
+	.has_coherent_ggtt = true, \
 	GEN_DEFAULT_PIPEOFFSETS, \
 	GEN_DEFAULT_PAGE_SIZES, \
 	CURSOR_OFFSETS
@@ -220,6 +224,7 @@ static const struct intel_device_info intel_gm45_info = {
 	.has_hotplug = 1, \
 	.ring_mask = RENDER_RING | BSD_RING, \
 	.has_snoop = true, \
+	.has_coherent_ggtt = true, \
 	/* ilk does support rc6, but we do not implement [power] contexts */ \
 	.has_rc6 = 0, \
 	GEN_DEFAULT_PIPEOFFSETS, \
@@ -243,6 +248,7 @@ static const struct intel_device_info intel_ironlake_m_info = {
 	.has_hotplug = 1, \
 	.has_fbc = 1, \
 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING, \
+	.has_coherent_ggtt = true, \
 	.has_llc = 1, \
 	.has_rc6 = 1, \
 	.has_rc6p = 1, \
@@ -287,6 +293,7 @@ static const struct intel_device_info intel_sandybridge_m_gt2_info = {
 	.has_hotplug = 1, \
 	.has_fbc = 1, \
 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING, \
+	.has_coherent_ggtt = true, \
 	.has_llc = 1, \
 	.has_rc6 = 1, \
 	.has_rc6p = 1, \
@@ -347,6 +354,7 @@ static const struct intel_device_info intel_valleyview_info = {
 	.has_aliasing_ppgtt = 1,
 	.has_full_ppgtt = 1,
 	.has_snoop = true,
+	.has_coherent_ggtt = false,
 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING,
 	.display_mmio_offset = VLV_DISPLAY_BASE,
 	GEN_DEFAULT_PAGE_SIZES,
@@ -441,6 +449,7 @@ static const struct intel_device_info intel_cherryview_info = {
 	.has_full_ppgtt = 1,
 	.has_reset_engine = 1,
 	.has_snoop = true,
+	.has_coherent_ggtt = false,
 	.display_mmio_offset = VLV_DISPLAY_BASE,
 	GEN_DEFAULT_PAGE_SIZES,
 	GEN_CHV_PIPEOFFSETS,
@@ -517,6 +526,7 @@ static const struct intel_device_info intel_skylake_gt4_info = {
 	.has_full_48bit_ppgtt = 1, \
 	.has_reset_engine = 1, \
 	.has_snoop = true, \
+	.has_coherent_ggtt = false, \
 	.has_ipc = 1, \
 	GEN9_DEFAULT_PAGE_SIZES, \
 	GEN_DEFAULT_PIPEOFFSETS, \
diff --git a/drivers/gpu/drm/i915/intel_device_info.h b/drivers/gpu/drm/i915/intel_device_info.h
index 633f9fbf72ea..07e8364d1a8c 100644
--- a/drivers/gpu/drm/i915/intel_device_info.h
+++ b/drivers/gpu/drm/i915/intel_device_info.h
@@ -106,6 +106,7 @@ enum intel_platform {
 	func(has_resource_streamer); \
 	func(has_runtime_pm); \
 	func(has_snoop); \
+	func(has_coherent_ggtt); \
 	func(unfenced_needs_alignment); \
 	func(cursor_needs_physical); \
 	func(hws_needs_physical); \