From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A44B134B1A3; Mon, 27 Apr 2026 05:55:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777269351; cv=none; b=ocsmzT6s6TVlL1hOXSRYVveFScocCU8EJmmeqD3j+2i4pmKBraYlwhqOqCkZMFsmSzn+h3tHCHJUz/J3aROrfiYxMjI3dDlIwhg7/RAd5b0cGeszdpGyVHyhxZG4u6AvzVyf5Q9XZonkx0eTEKLlOzuXPLPREq48mTYloHtcGcw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777269351; c=relaxed/simple; bh=u9Nxyxygf4qPGYAgMTCv2majmXN+k5vEhMk1b0dtxGQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CLMALt8tG7vOrMtkvASNw9hqSNaaBdWwxkdiOT1As+5GeMWHDFQOKX8T7cWAQhvL3OwJ2Zpf9oKfZ/kKuuZVeHx2hKDk6w4oXQX1saTEyFD+0vEAU8vb/AjBum8KrXUGrBgIayE3mxEVDCVg5W1bldVkaUnrxGgcOwvZXLCwnDg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=kgBWSk74; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="kgBWSk74" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4E3CDC19425; Mon, 27 Apr 2026 05:55:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777269351; bh=u9Nxyxygf4qPGYAgMTCv2majmXN+k5vEhMk1b0dtxGQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kgBWSk74gyOxSSSpWNz5R+kKDy5QL/8m9xtlDTKDuMVmkwGaCOkWivKXgwaLYgHbK D3oV2TRq851n2uZRFG0q28PyddEilxmZbfpryBuvb0Zas8R969nP/8dx5IgDBhd1ev X7JccXNKBKCJI2392tM9hHT/eNMC50/WP1NkazDbaM3xQISuYi6DtFLiP2IK4R6/a9 7Fpn6CwFvpcdIYTPMfMi8EIsxT/hoKoeaHepiS5iNxp1vbc56GpQBMpPAqRhzuocKK sPBdJV8Im/Tj8TNWeA6voRZXPNWRSW+2kjsAgZBETzBbi7ey/CuOXthKP45bgXR9bN fnXHZBiiRWpEA== From: "Aneesh Kumar K.V (Arm)" To: iommu@lists.linux.dev, linux-kernel@vger.kernel.org Cc: "Aneesh Kumar K.V (Arm)" , Robin Murphy , Marek Szyprowski , Will Deacon , Marc Zyngier , Steven Price , Suzuki K Poulose , Catalin Marinas , Jiri Pirko , Jason Gunthorpe , Mostafa Saleh , Petr Tesarik , Alexey Kardashevskiy , Dan Williams , Xu Yilun Subject: [PATCH v3 5/9] dma-mapping: make dma_pgprot() honor DMA_ATTR_CC_SHARED Date: Mon, 27 Apr 2026 11:25:05 +0530 Message-ID: <20260427055509.898190-6-aneesh.kumar@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260427055509.898190-1-aneesh.kumar@kernel.org> References: <20260427055509.898190-1-aneesh.kumar@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Fold encrypted/decrypted pgprot selection into dma_pgprot() so callers do not need to adjust the page protection separately. Update dma_pgprot() to apply pgprot_decrypted() when DMA_ATTR_CC_SHARED is set and pgprot_encrypted() otherwise Convert the dma-direct allocation and mmap paths to pass DMA_ATTR_CC_SHARED instead of open-coding force_dma_unencrypted() handling around dma_pgprot(). Signed-off-by: Aneesh Kumar K.V (Arm) --- kernel/dma/direct.c | 8 +++----- kernel/dma/mapping.c | 16 ++++++++++++---- 2 files changed, 15 insertions(+), 9 deletions(-) diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index 9373b9dcfb7b..a4aa7e1df2bb 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -298,9 +298,6 @@ void *dma_direct_alloc(struct device *dev, size_t size, if (remap) { pgprot_t prot = dma_pgprot(dev, PAGE_KERNEL, attrs); - if (force_dma_unencrypted(dev)) - prot = pgprot_decrypted(prot); - /* remove any dirty cache lines on the kernel alias */ arch_dma_prep_coherent(page, size); @@ -603,9 +600,10 @@ int dma_direct_mmap(struct device *dev, struct vm_area_struct *vma, unsigned long pfn = PHYS_PFN(dma_to_phys(dev, dma_addr)); int ret = -ENXIO; - vma->vm_page_prot = dma_pgprot(dev, vma->vm_page_prot, attrs); if (force_dma_unencrypted(dev)) - vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); + attrs |= DMA_ATTR_CC_SHARED; + + vma->vm_page_prot = dma_pgprot(dev, vma->vm_page_prot, attrs); if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret)) return ret; diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index 23ed8eb9233e..44f715f3aa2d 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -543,13 +543,21 @@ EXPORT_SYMBOL(dma_get_sgtable_attrs); */ pgprot_t dma_pgprot(struct device *dev, pgprot_t prot, unsigned long attrs) { + pgprot_t dma_prot; + if (dev_is_dma_coherent(dev)) - return prot; + dma_prot = prot; #ifdef CONFIG_ARCH_HAS_DMA_WRITE_COMBINE - if (attrs & DMA_ATTR_WRITE_COMBINE) - return pgprot_writecombine(prot); + else if (attrs & DMA_ATTR_WRITE_COMBINE) + dma_prot = pgprot_writecombine(prot); #endif - return pgprot_dmacoherent(prot); + else + dma_prot = pgprot_dmacoherent(prot); + + if (attrs & DMA_ATTR_CC_SHARED) + return pgprot_decrypted(dma_prot); + else + return pgprot_encrypted(dma_prot); } #endif /* CONFIG_MMU */ -- 2.43.0