drm/panfrost: Split io-pgtable requests properly

Although we don't use 1GB block mappings, we still need to split
map/unmap requests at 1GB boundaries to match what io-pgtable expects.
Fix that, and add some explanation to make sense of it all.

Fixes: 3740b081795a ("drm/panfrost: Update io-pgtable API")
Reported-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/49e54bb4019cd06e01549b106d7ac37c3d182cd3.1667927179.git.robin.murphy@arm.com

diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
index e246d91..4e83a18 100644 (file)
--- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
@@ -250,13 +250,22 @@ void panfrost_mmu_reset(struct panfrost_device *pfdev)
 
 static size_t get_pgsize(u64 addr, size_t size, size_t *count)
 {
+       /*
+        * io-pgtable only operates on multiple pages within a single table
+        * entry, so we need to split at boundaries of the table size, i.e.
+        * the next block size up. The distance from address A to the next
+        * boundary of block size B is logically B - A % B, but in unsigned
+        * two's complement where B is a power of two we get the equivalence
+        * B - A % B == (B - A) % B == (n * B - A) % B, and choose n = 0 :)
+        */
        size_t blk_offset = -addr % SZ_2M;
 
        if (blk_offset || size < SZ_2M) {
                *count = min_not_zero(blk_offset, size) / SZ_4K;
                return SZ_4K;
        }
-       *count = size / SZ_2M;
+       blk_offset = -addr % SZ_1G ?: SZ_1G;
+       *count = min(blk_offset, size) / SZ_2M;
        return SZ_2M;
 }