From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 E98473F54AD; Thu, 4 Jun 2026 08:41:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780562485; cv=none; b=dNQxTYQNsKGtFVF1WbhBHpEEFVoDufbyE7Q4wLzJ+MCtUL9QIen+aMyTK/PhEOGzhCs/aGQ9hArkAP5dkh8zzZce35EvxRFHiAPnepBOmj9nnR0mhH8uNSjPzp+u89yBGjC5T8nAYW0pyoKUJsE2NZTTqOs4j0FKH1hkPLlEPj8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780562485; c=relaxed/simple; bh=nvh8fIDNVPfMC0ICTaQnFFRAmvBIOsOrYj/UqKcPxjs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pyXv4lLDifI8WVdGH7ivBaYsRHhbcjkuUraHN5DS6SKyY03RHJezFDIJsoYNBKlWn+bHPTVE6UbbwzMwn53dunl7q09tDMGAOBC8ECMilacKCIbNvrOvqBA7n1RBoZsyh7MxJENa+AiwONamgmVjmqlUQhzFBhL4U+vkrCat/sM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dGHCOI2B; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="dGHCOI2B" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 91CED1F00893; Thu, 4 Jun 2026 08:41:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1780562478; bh=7TH+Qx6Oz0KBtBZSC9IyhaEGjXmJSkpAjhqTot9QjuU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=dGHCOI2Bz9um/GE0RCmyC1Qk8mhygoFuyVx4f9RWLcknMIrnOeO1o89nB7cD6S1eF HCwS2uugMipB1BZZH5MOmysdZMPH0ywJ3v9XoAj1yRJIpnDZO+zVuVaxmS7xdumvUp NhS3o2stcEn3JDpf4ibdzQtQIEtCrc8xyj9TzgZgAX2LAxwHSvOZoGAOydxesY33LJ w/TE2fgsn7CR7xJMRQ2Yv8WjUDeo1bXqs/XKP2MCtX+ZKF4fT7bhuDsxbjYKpoWdVf WEkG7JikC58CakVgsl1VdHpKsKTWdOMBv770v1GQXd2lrC7+ywI2slHBfh2xQzbqhw voPqTvIfAquqw== From: "Aneesh Kumar K.V (Arm)" To: iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev 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 , 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: [PATCH v6 07/20] dma-mapping: make dma_pgprot() honor DMA_ATTR_CC_SHARED Date: Thu, 4 Jun 2026 14:09:46 +0530 Message-ID: <20260604083959.1265923-8-aneesh.kumar@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260604083959.1265923-1-aneesh.kumar@kernel.org> References: <20260604083959.1265923-1-aneesh.kumar@kernel.org> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev 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(). Tested-by: Jiri Pirko Tested-by: Michael Kelley Tested-by: Mostafa Saleh 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 0b4a26c6b6fd..e4cba322386d 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -290,9 +290,6 @@ 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); @@ -614,9 +611,10 @@ 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 e6b07f160d20..3f4ae283c466 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -539,13 +539,21 @@ 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