Reviewed the patch & it looks fine.
Reviewed-by: "Akash Goel <akash.goel@xxxxxxxxx>"
On 7/29/2015 9:53 PM, Michel Thierry wrote:
Similar to PDs, while setting up a page directory pointer, make all entries
of the pdp point to the scratch pd before mapping (and make all its entries
point to the scratch page); this is to be safe in case of out of bound
access or proactive prefetch.
Also add a scratch pdp, which the PML4 entries point to.
v2: Handle scratch_pdp allocation failure correctly, and keep
initialize_px functions together (Akash)
v3: Rebase after Mika's ppgtt cleanup / scratch merge patch series. Rely on
the added macros to initialize the pdps.
v4: Rebase after final merged version of Mika's ppgtt/scratch patches
(and removed commit message part related to v3).
v5: Update commit message to also mention PML4 table initialization and
the new scratch pdp (Akash).
Suggested-by: Akash Goel <akash.goel@xxxxxxxxx>
Signed-off-by: Michel Thierry <michel.thierry@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 38 +++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_gem_gtt.h | 1 +
2 files changed, 39 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 7070d42..73cfe56 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -602,6 +602,27 @@ static void free_pdp(struct drm_device *dev,
}
}
+static void gen8_initialize_pdp(struct i915_address_space *vm,
+ struct i915_page_directory_pointer *pdp)
+{
+ gen8_ppgtt_pdpe_t scratch_pdpe;
+
+ scratch_pdpe = gen8_pdpe_encode(px_dma(vm->scratch_pd), I915_CACHE_LLC);
+
+ fill_px(vm->dev, pdp, scratch_pdpe);
+}
+
+static void gen8_initialize_pml4(struct i915_address_space *vm,
+ struct i915_pml4 *pml4)
+{
+ gen8_ppgtt_pml4e_t scratch_pml4e;
+
+ scratch_pml4e = gen8_pml4e_encode(px_dma(vm->scratch_pdp),
+ I915_CACHE_LLC);
+
+ fill_px(vm->dev, pml4, scratch_pml4e);
+}
+
static void
gen8_setup_page_directory(struct i915_hw_ppgtt *ppgtt,
struct i915_page_directory_pointer *pdp,
@@ -863,8 +884,20 @@ static int gen8_init_scratch(struct i915_address_space *vm)
return PTR_ERR(vm->scratch_pd);
}
+ if (USES_FULL_48BIT_PPGTT(dev)) {
+ vm->scratch_pdp = alloc_pdp(dev);
+ if (IS_ERR(vm->scratch_pdp)) {
+ free_pd(dev, vm->scratch_pd);
+ free_pt(dev, vm->scratch_pt);
+ free_scratch_page(dev, vm->scratch_page);
+ return PTR_ERR(vm->scratch_pdp);
+ }
+ }
+
gen8_initialize_pt(vm, vm->scratch_pt);
gen8_initialize_pd(vm, vm->scratch_pd);
+ if (USES_FULL_48BIT_PPGTT(dev))
+ gen8_initialize_pdp(vm, vm->scratch_pdp);
return 0;
}
@@ -873,6 +906,8 @@ static void gen8_free_scratch(struct i915_address_space *vm)
{
struct drm_device *dev = vm->dev;
+ if (USES_FULL_48BIT_PPGTT(dev))
+ free_pdp(dev, vm->scratch_pdp);
free_pd(dev, vm->scratch_pd);
free_pt(dev, vm->scratch_pt);
free_scratch_page(dev, vm->scratch_page);
@@ -1074,6 +1109,7 @@ gen8_ppgtt_alloc_page_dirpointers(struct i915_address_space *vm,
if (IS_ERR(pdp))
goto unwind_out;
+ gen8_initialize_pdp(vm, pdp);
pml4->pdps[pml4e] = pdp;
__set_bit(pml4e, new_pdps);
trace_i915_page_directory_pointer_entry_alloc(vm,
@@ -1353,6 +1389,8 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
if (ret)
goto free_scratch;
+ gen8_initialize_pml4(&ppgtt->base, &ppgtt->pml4);
+
ppgtt->base.total = 1ULL << 48;
ppgtt->switch_mm = gen8_48b_mm_switch;
} else {
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index 11d44b3..70c50e7 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -278,6 +278,7 @@ struct i915_address_space {
struct i915_page_scratch *scratch_page;
struct i915_page_table *scratch_pt;
struct i915_page_directory *scratch_pd;
+ struct i915_page_directory_pointer *scratch_pdp; /* GEN8+ & 48b PPGTT */
/**
* List of objects currently involved in rendering.
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