linux-kernel - [PATCH v7 2/2] drm/i915: Use correct huge page manager for MTL

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Message-Id: <20230425-hugepage-migrate-v7-2-fa6605a986c9@intel.com>
Date:   Wed, 26 Apr 2023 17:14:11 +0200
From:   Andrzej Hajda <andrzej.hajda@...el.com>
To:     intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Jonathan Cavitt <jonathan.cavitt@...el.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Matthew Auld <matthew.auld@...el.com>
Subject: [PATCH v7 2/2] drm/i915: Use correct huge page manager for MTL

From: Jonathan Cavitt <jonathan.cavitt@...el.com>

MTL currently uses gen8_ppgtt_insert_huge when managing huge pages.  This is because
MTL reports as not supporting 64K pages, or more accurately, the system that reports
whether a platform has 64K pages reports false for MTL.  This is only half correct,
as the 64K page support reporting system only cares about 64K page support for LMEM,
which MTL doesn't have.

MTL should be using xehpsdv_ppgtt_insert_huge.  However, simply changing over to
using that manager doesn't resolve the issue because MTL is expecting the virtual
address space for the page table to be flushed after initialization, so we must also
add a flush statement there.

Signed-off-by: Jonathan Cavitt <jonathan.cavitt@...el.com>
Reviewed-by: Matthew Auld <matthew.auld@...el.com>
Signed-off-by: Andrzej Hajda <andrzej.hajda@...el.com>
---
 drivers/gpu/drm/i915/gt/gen8_ppgtt.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
index 4daaa6f5566888..9c571185395f49 100644
--- a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
@@ -570,6 +570,7 @@ xehpsdv_ppgtt_insert_huge(struct i915_address_space *vm,
 			}
 		} while (rem >= page_size && index < max);
 
+		drm_clflush_virt_range(vaddr, PAGE_SIZE);
 		vma_res->page_sizes_gtt |= page_size;
 	} while (iter->sg && sg_dma_len(iter->sg));
 }
@@ -707,7 +708,7 @@ static void gen8_ppgtt_insert(struct i915_address_space *vm,
 	struct sgt_dma iter = sgt_dma(vma_res);
 
 	if (vma_res->bi.page_sizes.sg > I915_GTT_PAGE_SIZE) {
-		if (HAS_64K_PAGES(vm->i915))
+		if (GRAPHICS_VER_FULL(vm->i915) >= IP_VER(12, 50))
 			xehpsdv_ppgtt_insert_huge(vm, vma_res, &iter, cache_level, flags);
 		else
 			gen8_ppgtt_insert_huge(vm, vma_res, &iter, cache_level, flags);

-- 
2.34.1