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| author | Eric Auger | 2021-03-09 11:27:37 +0100 |
|---|---|---|
| committer | Peter Maydell | 2021-03-12 13:40:10 +0100 |
| commit | f14fb6c2db961c3665a61b342ab329b7bd20d1e7 (patch) | |
| tree | 57f311ed8f4d445ad5c1474751e76206e25bf972 /include | |
| parent | intel_iommu: Fix mask may be uninitialized in vtd_context_device_invalidate (diff) | |
| download | qemu-f14fb6c2db961c3665a61b342ab329b7bd20d1e7.tar.gz qemu-f14fb6c2db961c3665a61b342ab329b7bd20d1e7.tar.xz qemu-f14fb6c2db961c3665a61b342ab329b7bd20d1e7.zip | |
dma: Introduce dma_aligned_pow2_mask()
Currently get_naturally_aligned_size() is used by the intel iommu
to compute the maximum invalidation range based on @size which is
a power of 2 while being aligned with the @start address and less
than the maximum range defined by @gaw.
This helper is also useful for other iommu devices (virtio-iommu,
SMMUv3) to make sure IOMMU UNMAP notifiers only are called with
power of 2 range sizes.
Let's move this latter into dma-helpers.c and rename it into
dma_aligned_pow2_mask(). Also rewrite the helper so that it
accomodates UINT64_MAX values for the size mask and max mask.
It now returns a mask instead of a size. Change the caller.
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Message-id: 20210309102742.30442-3-eric.auger@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/sysemu/dma.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/sysemu/dma.h b/include/sysemu/dma.h index a052f7bca3..3201e7901d 100644 --- a/include/sysemu/dma.h +++ b/include/sysemu/dma.h @@ -296,4 +296,16 @@ uint64_t dma_buf_write(uint8_t *ptr, int32_t len, QEMUSGList *sg); void dma_acct_start(BlockBackend *blk, BlockAcctCookie *cookie, QEMUSGList *sg, enum BlockAcctType type); +/** + * dma_aligned_pow2_mask: Return the address bit mask of the largest + * power of 2 size less or equal than @end - @start + 1, aligned with @start, + * and bounded by 1 << @max_addr_bits bits. + * + * @start: range start address + * @end: range end address (greater than @start) + * @max_addr_bits: max address bits (<= 64) + */ +uint64_t dma_aligned_pow2_mask(uint64_t start, uint64_t end, + int max_addr_bits); + #endif |