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

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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
This commit is contained in:
Chris Wilson
2018-07-20 11:19:10 +01:00
parent 35e900818e
commit 900ccf30f9
5 changed files with 41 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/gpu/drm/i915/i915_pci.c
View File

@@ -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, \