[Intel-gfx] [PATCH V3 3/3] drm/i915: Refine VT-d scanout workaround
Tejas Upadhyay
tejaskumarx.surendrakumar.upadhyay at intel.com
Thu Feb 24 10:52:46 UTC 2022
From: Chris Wilson <chris at chris-wilson.co.uk>
VT-d may cause overfetch of the scanout PTE, both before and after the
vma (depending on the scanout orientation). bspec recommends that we
provide a tile-row in either directions, and suggests using 168 PTE,
warning that the accesses will wrap around the ends of the GGTT.
Currently, we fill the entire GGTT with scratch pages when using VT-d to
always ensure there are valid entries around every vma, including
scanout. However, writing every PTE is slow as on recent devices we
perform 8MiB of uncached writes, incurring an extra 100ms during resume.
If instead we focus on only putting guard pages around scanout, we can
avoid touching the whole GGTT. To avoid having to introduce extra nodes
around each scanout vma, we adjust the scanout drm_mm_node to be smaller
than the allocated space, and fixup the extra PTE during dma binding.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay at intel.com>
---
drivers/gpu/drm/i915/gem/i915_gem_domain.c | 13 +++++++++++
drivers/gpu/drm/i915/gt/intel_ggtt.c | 25 +---------------------
drivers/gpu/drm/i915/i915_gem_gtt.h | 1 +
drivers/gpu/drm/i915/i915_vma.c | 9 ++++++++
4 files changed, 24 insertions(+), 24 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_domain.c b/drivers/gpu/drm/i915/gem/i915_gem_domain.c
index 3e5d6057b3ef..35dbb76459af 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_domain.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_domain.c
@@ -17,6 +17,8 @@
#include "i915_gem_object.h"
#include "i915_vma.h"
+#define VTD_GUARD (168u * I915_GTT_PAGE_SIZE) /* 168 or tile-row PTE padding */
+
static bool gpu_write_needs_clflush(struct drm_i915_gem_object *obj)
{
struct drm_i915_private *i915 = to_i915(obj->base.dev);
@@ -424,6 +426,17 @@ i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
if (ret)
return ERR_PTR(ret);
+ /* VT-d may overfetch before/after the vma, so pad with scratch */
+ if (intel_scanout_needs_vtd_wa(i915)) {
+ unsigned int guard = VTD_GUARD;
+
+ if (i915_gem_object_is_tiled(obj))
+ guard = max(guard,
+ i915_gem_object_get_tile_row_size(obj));
+
+ flags |= PIN_OFFSET_GUARD | guard;
+ }
+
/*
* As the user may map the buffer once pinned in the display plane
* (e.g. libkms for the bootup splash), we have to ensure that we
diff --git a/drivers/gpu/drm/i915/gt/intel_ggtt.c b/drivers/gpu/drm/i915/gt/intel_ggtt.c
index 549c2178a0c9..4c43b8dd9ab6 100644
--- a/drivers/gpu/drm/i915/gt/intel_ggtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ggtt.c
@@ -366,27 +366,6 @@ static void nop_clear_range(struct i915_address_space *vm,
{
}
-static void gen8_ggtt_clear_range(struct i915_address_space *vm,
- u64 start, u64 length)
-{
- struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
- unsigned int first_entry = start / I915_GTT_PAGE_SIZE;
- unsigned int num_entries = length / I915_GTT_PAGE_SIZE;
- const gen8_pte_t scratch_pte = vm->scratch[0]->encode;
- gen8_pte_t __iomem *gtt_base =
- (gen8_pte_t __iomem *)ggtt->gsm + first_entry;
- const int max_entries = ggtt_total_entries(ggtt) - first_entry;
- int i;
-
- if (WARN(num_entries > max_entries,
- "First entry = %d; Num entries = %d (max=%d)\n",
- first_entry, num_entries, max_entries))
- num_entries = max_entries;
-
- for (i = 0; i < num_entries; i++)
- gen8_set_pte(>t_base[i], scratch_pte);
-}
-
static void bxt_vtd_ggtt_wa(struct i915_address_space *vm)
{
/*
@@ -989,8 +968,6 @@ 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 (intel_scanout_needs_vtd_wa(i915))
- ggtt->vm.clear_range = gen8_ggtt_clear_range;
ggtt->vm.insert_entries = gen8_ggtt_insert_entries;
@@ -1137,7 +1114,7 @@ static int gen6_gmch_probe(struct i915_ggtt *ggtt)
ggtt->vm.alloc_scratch_dma = alloc_pt_dma;
ggtt->vm.clear_range = nop_clear_range;
- if (!HAS_FULL_PPGTT(i915) || intel_scanout_needs_vtd_wa(i915))
+ if (!HAS_FULL_PPGTT(i915))
ggtt->vm.clear_range = gen6_ggtt_clear_range;
ggtt->vm.insert_page = gen6_ggtt_insert_page;
ggtt->vm.insert_entries = gen6_ggtt_insert_entries;
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index 8c2f57eb5dda..c8f3462f0208 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -44,6 +44,7 @@ int i915_gem_gtt_insert(struct i915_address_space *vm,
#define PIN_HIGH BIT_ULL(5)
#define PIN_OFFSET_BIAS BIT_ULL(6)
#define PIN_OFFSET_FIXED BIT_ULL(7)
+#define PIN_OFFSET_GUARD BIT_ULL(8)
#define PIN_VALIDATE BIT_ULL(8) /* validate placement only, no need to call unpin() */
#define PIN_GLOBAL BIT_ULL(10) /* I915_VMA_GLOBAL_BIND */
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index a00e8ff2a276..3ee3bf1c1b76 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -657,6 +657,10 @@ bool i915_vma_misplaced(const struct i915_vma *vma,
i915_vma_offset(vma) != (flags & PIN_OFFSET_MASK))
return true;
+ if (flags & PIN_OFFSET_GUARD &&
+ vma->guard < (flags & PIN_OFFSET_MASK))
+ return true;
+
return false;
}
@@ -735,6 +739,7 @@ i915_vma_insert(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
GEM_BUG_ON(i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
+ GEM_BUG_ON(hweight64(flags & (PIN_OFFSET_GUARD | PIN_OFFSET_FIXED | PIN_OFFSET_BIAS)) > 1);
size = max(size, vma->size);
alignment = max_t(typeof(alignment), alignment, vma->display_alignment);
@@ -749,6 +754,10 @@ i915_vma_insert(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
GEM_BUG_ON(!is_power_of_2(alignment));
guard = vma->guard; /* retain guard across rebinds */
+ if (flags & PIN_OFFSET_GUARD) {
+ GEM_BUG_ON(overflows_type(flags & PIN_OFFSET_MASK, u32));
+ guard = max_t(u32, guard, flags & PIN_OFFSET_MASK);
+ }
guard = ALIGN(guard, alignment);
start = flags & PIN_OFFSET_BIAS ? flags & PIN_OFFSET_MASK : 0;
--
2.34.1
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