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Thu, 11 Jun 2026 05:25:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1781155561; bh=XDuIn3y/rCO4r9DXHWsg+1RIZVo9GqzNtV1PP4apQRs=; h=From:To:Cc:Subject:In-Reply-To:References:Date; b=G3lWXQ1eDa81mBrJCkA/PCQooKDKZDvbt48avgp0O6fw29Xx6sKxbhO5qZnkxZ4u9 OxKbgbkMquVdngJ8SPiyWyre/tflzFPwaxG9vTOH79OGqlciuGssBF34DWyso1CHZw aDVLXDoti3JcbI9D0Oi2cQfQuhj+pJ3kbX4EYy4Xe2MEKUwpaADT61w7nEgRm3kwLM tSP+LAKWvEyh/ut0Dg4osfZsHaat6KgXBk/q1moX91KKeOfFQmsmWMabYftzxu7D6x 6RhvniODTNH6y39Z5sFE58ao01nIDFW6k3pW4yaiik4r+mgNv+m7xs7Nex2pRFVN0z TxODrAxyW9DsA== X-Mailer: emacs 30.2 (via feedmail 11-beta-1 I) From: Aneesh Kumar K.V To: Jason Gunthorpe 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 , Mostafa Saleh , Petr Tesarik , 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, Jiri Pirko , Michael Kelley Subject: Re: [PATCH v6 04/20] dma-pool: track decrypted atomic pools and select them via attrs In-Reply-To: <20260609143242.GK2764304@ziepe.ca> References: <20260604083959.1265923-1-aneesh.kumar@kernel.org> <20260604083959.1265923-5-aneesh.kumar@kernel.org> <20260609143242.GK2764304@ziepe.ca> Date: Thu, 11 Jun 2026 10:55:47 +0530 Message-ID: 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 Jason Gunthorpe writes: > The sashiko note does look legit though: > > if (IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) && > !gfpflags_allow_blocking(gfp) && !coherent) { > page = dma_alloc_from_pool(dev, PAGE_ALIGN(size), &cpu_addr, > gfp, attrs, NULL); > if (!page) > return NULL; > > I don't see anything doing the force_dma_unencrypted test along this > callchain.. > > I guess it should be done one step up in dma_alloc_attrs() instead of > in dma_direct_alloc()? > I think we should do something similar to what dma_map_phys() does here, considering that we only support DMA direct with DMA_ATTR_CC_SHARED/DMA_ATTR_ALLOC_CC_SHARED. @@ -637,6 +637,7 @@ void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle, { const struct dma_map_ops *ops = get_dma_ops(dev); void *cpu_addr; + bool is_cc_shared; WARN_ON_ONCE(!dev->coherent_dma_mask); @@ -657,8 +658,17 @@ void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle, /* let the implementation decide on the zone to allocate from: */ flag &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM); + if (force_dma_unencrypted(dev)) + attrs |= DMA_ATTR_ALLOC_CC_SHARED; + + is_cc_shared = attrs & DMA_ATTR_CC_SHARED; + if (dma_alloc_direct(dev, ops) || arch_dma_alloc_direct(dev)) { cpu_addr = dma_direct_alloc(dev, size, dma_handle, flag, attrs); + } else if (is_cc_shared) { + trace_dma_alloc(dev, NULL, 0, size, DMA_BIDIRECTIONAL, flag, + attrs); + return NULL; } else if (use_dma_iommu(dev)) { cpu_addr = iommu_dma_alloc(dev, size, dma_handle, flag, attrs); } else if (ops->alloc) { -aneesh