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Tue, 09 Jun 2026 05:21:35 -0700 (PDT) Date: Tue, 9 Jun 2026 14:21:22 +0200 From: Petr Tesarik To: "Aneesh Kumar K.V (Arm)" Cc: iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev, Robin Murphy , Marek Szyprowski , Will Deacon , Marc Zyngier , Steven Price , Suzuki K Poulose , Catalin Marinas , Jiri Pirko , Jason Gunthorpe , Mostafa Saleh , Alexey Kardashevskiy , Dan Williams , Xu Yilun , linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , x86@kernel.org, Michael Kelley Subject: Re: [PATCH v6 05/20] dma: swiotlb: pass mapping attributes by reference Message-ID: <20260609142122.7e721621@mordecai> In-Reply-To: <20260604083959.1265923-6-aneesh.kumar@kernel.org> References: <20260604083959.1265923-1-aneesh.kumar@kernel.org> <20260604083959.1265923-6-aneesh.kumar@kernel.org> X-Mailer: Claws Mail 4.4.0 (GTK 3.24.52; x86_64-suse-linux-gnu) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Thu, 4 Jun 2026 14:09:44 +0530 "Aneesh Kumar K.V (Arm)" wrote: > Change swiotlb_tbl_map_single() to take the DMA mapping attributes by > reference and update the direct callers accordingly. > > This is a preparatory change for a follow-up patch which updates the > attributes based on the selected swiotlb pool. Keeping the signature change > separate makes the follow-up patch easier to review. > > No functional change in this patch. > > Tested-by: Michael Kelley > Tested-by: Mostafa Saleh > Signed-off-by: Aneesh Kumar K.V (Arm) Reviewed-by: Petr Tesarik Thanks Petr T > --- > drivers/iommu/dma-iommu.c | 2 +- > drivers/xen/swiotlb-xen.c | 2 +- > include/linux/swiotlb.h | 2 +- > kernel/dma/swiotlb.c | 6 +++--- > 4 files changed, 6 insertions(+), 6 deletions(-) > > diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c > index c2595bee3d41..725c7adb0a8d 100644 > --- a/drivers/iommu/dma-iommu.c > +++ b/drivers/iommu/dma-iommu.c > @@ -1180,7 +1180,7 @@ static phys_addr_t iommu_dma_map_swiotlb(struct device *dev, phys_addr_t phys, > trace_swiotlb_bounced(dev, phys, size); > > phys = swiotlb_tbl_map_single(dev, phys, size, iova_mask(iovad), dir, > - attrs); > + &attrs); > > /* > * Untrusted devices should not see padding areas with random leftover > diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c > index 2cbf2b588f5b..8c4abe65cd49 100644 > --- a/drivers/xen/swiotlb-xen.c > +++ b/drivers/xen/swiotlb-xen.c > @@ -243,7 +243,7 @@ static dma_addr_t xen_swiotlb_map_phys(struct device *dev, phys_addr_t phys, > */ > trace_swiotlb_bounced(dev, dev_addr, size); > > - map = swiotlb_tbl_map_single(dev, phys, size, 0, dir, attrs); > + map = swiotlb_tbl_map_single(dev, phys, size, 0, dir, &attrs); > if (map == (phys_addr_t)DMA_MAPPING_ERROR) > return DMA_MAPPING_ERROR; > > diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h > index 133bb8ca9032..29187cec90d8 100644 > --- a/include/linux/swiotlb.h > +++ b/include/linux/swiotlb.h > @@ -238,7 +238,7 @@ static inline phys_addr_t default_swiotlb_limit(void) > > phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys, > size_t mapping_size, unsigned int alloc_aligned_mask, > - enum dma_data_direction dir, unsigned long attrs); > + enum dma_data_direction dir, unsigned long *attrs); > dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys, > size_t size, enum dma_data_direction dir, unsigned long attrs); > > diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c > index be4d418d92ac..78ce05857c00 100644 > --- a/kernel/dma/swiotlb.c > +++ b/kernel/dma/swiotlb.c > @@ -1391,7 +1391,7 @@ static unsigned long mem_used(struct io_tlb_mem *mem) > */ > phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr, > size_t mapping_size, unsigned int alloc_align_mask, > - enum dma_data_direction dir, unsigned long attrs) > + enum dma_data_direction dir, unsigned long *attrs) > { > struct io_tlb_mem *mem = dev->dma_io_tlb_mem; > unsigned int offset; > @@ -1425,7 +1425,7 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr, > size = ALIGN(mapping_size + offset, alloc_align_mask + 1); > index = swiotlb_find_slots(dev, orig_addr, size, alloc_align_mask, &pool); > if (index == -1) { > - if (!(attrs & DMA_ATTR_NO_WARN)) > + if (!(*attrs & DMA_ATTR_NO_WARN)) > dev_warn_ratelimited(dev, > "swiotlb buffer is full (sz: %zd bytes), total %lu (slots), used %lu (slots)\n", > size, mem->nslabs, mem_used(mem)); > @@ -1604,7 +1604,7 @@ dma_addr_t swiotlb_map(struct device *dev, phys_addr_t paddr, size_t size, > > trace_swiotlb_bounced(dev, phys_to_dma(dev, paddr), size); > > - swiotlb_addr = swiotlb_tbl_map_single(dev, paddr, size, 0, dir, attrs); > + swiotlb_addr = swiotlb_tbl_map_single(dev, paddr, size, 0, dir, &attrs); > if (swiotlb_addr == (phys_addr_t)DMA_MAPPING_ERROR) > return DMA_MAPPING_ERROR; >