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drm/panfrost: Handle page mapping failure

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When mapping the pages of a BO, either a heap type at page fault time or
else a non-heap BO at object creation time, if the ARM page table mapping
function fails, we unmap what had been mapped so far and bail out.

Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.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/20251019145225.3621989-7-adrian.larumbe@collabora.com
Signed-off-by: Steven Price <steven.price@arm.com>
This commit is contained in:
Adrián Larumbe
2025-10-19 15:52:11 +01:00
committed by Steven Price
parent 3d7c626716
commit 4da352cf8f
1 changed files with 44 additions and 5 deletions
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49
drivers/gpu/drm/panfrost/panfrost_mmu.c
View File

@@ -395,13 +395,32 @@ static void panfrost_mmu_flush_range(struct panfrost_device *pfdev,
pm_runtime_put_autosuspend(pfdev->base.dev);
}
static void mmu_unmap_range(struct panfrost_mmu *mmu, u64 iova, size_t len)
{
struct io_pgtable_ops *ops = mmu->pgtbl_ops;
size_t pgsize, unmapped_len = 0;
size_t unmapped_page, pgcount;
while (unmapped_len < len) {
pgsize = get_pgsize(iova, len - unmapped_len, &pgcount);
unmapped_page = ops->unmap_pages(ops, iova, pgsize, pgcount, NULL);
WARN_ON(unmapped_page != pgsize * pgcount);
iova += pgsize * pgcount;
unmapped_len += pgsize * pgcount;
}
}
static int mmu_map_sg(struct panfrost_device *pfdev, struct panfrost_mmu *mmu,
u64 iova, int prot, struct sg_table *sgt)
{
unsigned int count;
struct scatterlist *sgl;
struct io_pgtable_ops *ops = mmu->pgtbl_ops;
size_t total_mapped = 0;
u64 start_iova = iova;
int ret;
for_each_sgtable_dma_sg(sgt, sgl, count) {
unsigned long paddr = sg_dma_address(sgl);
@@ -415,10 +434,14 @@ static int mmu_map_sg(struct panfrost_device *pfdev, struct panfrost_mmu *mmu,
size_t pgcount, mapped = 0;
size_t pgsize = get_pgsize(iova | paddr, len, &pgcount);
ops->map_pages(ops, iova, paddr, pgsize, pgcount, prot,
ret = ops->map_pages(ops, iova, paddr, pgsize, pgcount, prot,
GFP_KERNEL, &mapped);
if (ret)
goto err_unmap_pages;
/* Don't get stuck if things have gone wrong */
mapped = max(mapped, pgsize);
total_mapped += mapped;
iova += mapped;
paddr += mapped;
len -= mapped;
@@ -428,6 +451,10 @@ static int mmu_map_sg(struct panfrost_device *pfdev, struct panfrost_mmu *mmu,
panfrost_mmu_flush_range(pfdev, mmu, start_iova, iova - start_iova);
return 0;
err_unmap_pages:
mmu_unmap_range(mmu, start_iova, total_mapped);
return ret;
}
int panfrost_mmu_map(struct panfrost_gem_mapping *mapping)
@@ -438,6 +465,7 @@ int panfrost_mmu_map(struct panfrost_gem_mapping *mapping)
struct panfrost_device *pfdev = to_panfrost_device(obj->dev);
struct sg_table *sgt;
int prot = IOMMU_READ | IOMMU_WRITE | IOMMU_CACHE;
int ret;
if (WARN_ON(mapping->active))
return 0;
@@ -449,11 +477,18 @@ int panfrost_mmu_map(struct panfrost_gem_mapping *mapping)
if (WARN_ON(IS_ERR(sgt)))
return PTR_ERR(sgt);
mmu_map_sg(pfdev, mapping->mmu, mapping->mmnode.start << PAGE_SHIFT,
prot, sgt);
ret = mmu_map_sg(pfdev, mapping->mmu, mapping->mmnode.start << PAGE_SHIFT,
prot, sgt);
if (ret)
goto err_put_pages;
mapping->active = true;
return 0;
err_put_pages:
drm_gem_shmem_put_pages_locked(shmem);
return ret;
}
void panfrost_mmu_unmap(struct panfrost_gem_mapping *mapping)
@@ -638,8 +673,10 @@ static int panfrost_mmu_map_fault_addr(struct panfrost_device *pfdev, int as,
if (ret)
goto err_map;
mmu_map_sg(pfdev, bomapping->mmu, addr,
IOMMU_WRITE | IOMMU_READ | IOMMU_CACHE | IOMMU_NOEXEC, sgt);
ret = mmu_map_sg(pfdev, bomapping->mmu, addr,
IOMMU_WRITE | IOMMU_READ | IOMMU_CACHE | IOMMU_NOEXEC, sgt);
if (ret)
goto err_mmu_map_sg;
bomapping->active = true;
bo->heap_rss_size += SZ_2M;
@@ -653,6 +690,8 @@ out:
return 0;
err_mmu_map_sg:
dma_unmap_sgtable(pfdev->base.dev, sgt, DMA_BIDIRECTIONAL, 0);
err_map:
sg_free_table(sgt);
err_unlock: