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drm/panfrost: Check sgt to know whether pages are already mapped

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In the MMU's page fault ISR for a heap object, determine whether the
faulting address belongs to a 2MiB block that was already mapped by
checking its corresponding sgt in the Panfrost BO.

This is done in preparation for a future commit in which the MMU mapping
helper might fail, but the page array is left populated, so this cannot
be used as a check for an early bail-out.

Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>
Link: https://lore.kernel.org/r/20251019145225.3621989-6-adrian.larumbe@collabora.com
Signed-off-by: Steven Price <steven.price@arm.com>
This commit is contained in:
Adrián Larumbe
2025-10-19 15:52:10 +01:00
committed by Steven Price
parent f45f73c68c
commit 3d7c626716
1 changed files with 6 additions and 5 deletions
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11
drivers/gpu/drm/panfrost/panfrost_mmu.c
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@@ -602,10 +602,12 @@ static int panfrost_mmu_map_fault_addr(struct panfrost_device *pfdev, int as,
refcount_set(&bo->base.pages_use_count, 1);
} else {
pages = bo->base.pages;
if (pages[page_offset]) {
/* Pages are already mapped, bail out. */
goto out;
}
}
sgt = &bo->sgts[page_offset / (SZ_2M / PAGE_SIZE)];
if (sgt->sgl) {
/* Pages are already mapped, bail out. */
goto out;
}
mapping = bo->base.base.filp->f_mapping;
@@ -627,7 +629,6 @@ static int panfrost_mmu_map_fault_addr(struct panfrost_device *pfdev, int as,
}
}
sgt = &bo->sgts[page_offset / (SZ_2M / PAGE_SIZE)];
ret = sg_alloc_table_from_pages(sgt, pages + page_offset,
NUM_FAULT_PAGES, 0, SZ_2M, GFP_KERNEL);
if (ret)