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Bottomley" , Helge Deller , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Geoff Levand , "David S. Miller" , Andreas Larsson , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, xen-devel@lists.xenproject.org, linux-alpha@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, sparclinux Subject: Re: [PATCH v5 11/14] sparc: Use physical address DMA mapping Message-ID: <20260217131525.GK12989@unreal> References: <20251015-remove-map-page-v5-0-3bbfe3a25cdf@kernel.org> <20251015-remove-map-page-v5-11-3bbfe3a25cdf@kernel.org> <7131d609-b083-4264-818a-21de38c1c3ed@samsung.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <7131d609-b083-4264-818a-21de38c1c3ed@samsung.com> On Tue, Feb 17, 2026 at 01:55:56PM +0100, Marek Szyprowski wrote: > On 17.02.2026 13:27, John Paul Adrian Glaubitz wrote: > > On Wed, 2025-10-15 at 12:12 +0300, Leon Romanovsky wrote: > >> From: Leon Romanovsky > >> > >> Convert sparc architecture DMA code to use .map_phys callback. > >> > >> Signed-off-by: Leon Romanovsky > >> --- > >> arch/sparc/kernel/iommu.c | 30 +++++++++++++++++----------- > >> arch/sparc/kernel/pci_sun4v.c | 31 ++++++++++++++++++----------- > >> arch/sparc/mm/io-unit.c | 38 ++++++++++++++++++----------------- > >> arch/sparc/mm/iommu.c | 46 ++++++++++++++++++++++--------------------- > >> 4 files changed, 82 insertions(+), 63 deletions(-) <...> > >> @@ -296,7 +305,6 @@ static dma_addr_t dma_4u_map_page(struct device *dev, struct page *page, > >> bus_addr = (iommu->tbl.table_map_base + > >> ((base - iommu->page_table) << IO_PAGE_SHIFT)); > >> ret = bus_addr | (oaddr & ~IO_PAGE_MASK); > >> - base_paddr = __pa(oaddr & IO_PAGE_MASK); > >> if (strbuf->strbuf_enabled) > >> iopte_protection = IOPTE_STREAMING(ctx); > >> else > >> @@ -304,8 +312,8 @@ static dma_addr_t dma_4u_map_page(struct device *dev, struct page *page, > >> if (direction != DMA_TO_DEVICE) > >> iopte_protection |= IOPTE_WRITE; > >> > >> - for (i = 0; i < npages; i++, base++, base_paddr += IO_PAGE_SIZE) > >> - iopte_val(*base) = iopte_protection | base_paddr; > >> + for (i = 0; i < npages; i++, base++, phys += IO_PAGE_SIZE) > >> + iopte_val(*base) = iopte_protection | phys; > > 'base_paddr' was aligned to start of a page before this patch, while > 'phys' includes the offset within a page. Thanks for the fix. I had assumed we needed to revert all changes in iounit_get_area(). Thanks > > > Could You check if the following change fixes the issue? > > diff --git a/arch/sparc/kernel/iommu.c b/arch/sparc/kernel/iommu.c > index 46ef88bc9c26..edb0ffb21e2f 100644 > --- a/arch/sparc/kernel/iommu.c > +++ b/arch/sparc/kernel/iommu.c > @@ -312,6 +312,7 @@ static dma_addr_t dma_4u_map_phys(struct device > *dev, phys_addr_t phys, >         if (direction != DMA_TO_DEVICE) >                 iopte_protection |= IOPTE_WRITE; > > +       phys -= offset_in_page(phys); >         for (i = 0; i < npages; i++, base++, phys += IO_PAGE_SIZE) >                 iopte_val(*base) = iopte_protection | phys; > > >> ... > > Best regards > -- > Marek Szyprowski, PhD > Samsung R&D Institute Poland >