From nobody Thu Oct 2 10:39:57 2025 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 4ABB4313D4B; Thu, 18 Sep 2025 14:10:13 +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=1758204613; cv=none; b=JAcvbNDavuVTtmTYx1q2JEPfIACKVxj+sXE3btjOTbEpGtrg28hrthvPt6gwxrkg6a6RcMKJ2fzB8MJUyyHrKQHHGNve+4htkcrqC0ocvQHuuJ66GCgIEW+fRtMRJaTW9BZvi/oQHMsQDtNpfk4Rhxn151wdys4G9gBSYaJnAzY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758204613; c=relaxed/simple; bh=EBwyVcXAx8ZG32+m2XXWq6jJ96SEAu9YsPWb4/XSEXM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=UNtyYMhDReo3wFfexPAh+rkslsE3DRL+f0GxcvotwEzFNmhS9f19hJgAebjTAqZ0X7w5C3ymdf4i/D12m6UQ5Px3G4MKcq/c8A0opXnP+fVTVLlEYciyI+hPJwa0x7+hqaU2j2LjIoGf/s1PET4rfDVIKKOD7O5SK3u1Wb3jC/4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=g91qhJGx; 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="g91qhJGx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 89A72C4CEE7; Thu, 18 Sep 2025 14:10:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1758204613; bh=EBwyVcXAx8ZG32+m2XXWq6jJ96SEAu9YsPWb4/XSEXM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=g91qhJGxeoCacHMXVvMTz7RIXE3W5xSK+eWI3ZLQKEzqvjgAwd3KWhjzecEB9E9XW Rog6AOcsA1/dXWOM5n73e63ivD27zsQZVe8Pd0yJtupjYQMR1BlhsemQeWHwRdWjHs JU52tCUyMio20fbK9hzR2G+f4bLvtIhFNOhtpO7+0S9foMZCCJ6QioLxkx1s1F1nZ5 sqsdKXDyDwfs2QJPX9Ye4hYDNMVOMX+HVDKgXwQWdZ3DiDgAiH4+OI3r8YRkv/Szwm pYMc+5LhUcjh+0xKf0SYlpfujhwDmXUrnf0YX8zhaTeFiJx+/JlbkjdZ6oTbI2n83v 2kL6eEufZWuLQ== From: Leon Romanovsky To: Marek Szyprowski Cc: Leon Romanovsky , Jason Gunthorpe , iommu@lists.linux.dev, Juergen Gross , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Russell King , Stefano Stabellini , xen-devel@lists.xenproject.org Subject: [PATCH v4 1/6] dma-mapping: prepare dma_map_ops to conversion to physical address Date: Thu, 18 Sep 2025 17:09:24 +0300 Message-ID: <24d324344913170315f66cb43ac6692b3132a145.1758203802.git.leon@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Leon Romanovsky Add new .map_phys() and .unmap_phys() callbacks to dma_map_ops as a preparation to replace .map_page() and .unmap_page() respectively. Reviewed-by: Jason Gunthorpe Signed-off-by: Leon Romanovsky --- include/linux/dma-map-ops.h | 7 +++++++ kernel/dma/mapping.c | 4 ++++ kernel/dma/ops_helpers.c | 12 ++++++++++-- 3 files changed, 21 insertions(+), 2 deletions(-) diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h index 71f5b30254159..25603cb273769 100644 --- a/include/linux/dma-map-ops.h +++ b/include/linux/dma-map-ops.h @@ -37,6 +37,13 @@ struct dma_map_ops { void (*unmap_page)(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction dir, unsigned long attrs); + + dma_addr_t (*map_phys)(struct device *dev, phys_addr_t phys, + size_t size, enum dma_data_direction dir, + unsigned long attrs); + void (*unmap_phys)(struct device *dev, dma_addr_t dma_handle, + size_t size, enum dma_data_direction dir, + unsigned long attrs); /* * map_sg should return a negative error code on error. See * dma_map_sgtable() for a list of appropriate error codes diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index fe7472f13b106..4080aebe5debb 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -169,6 +169,8 @@ dma_addr_t dma_map_phys(struct device *dev, phys_addr_t= phys, size_t size, addr =3D dma_direct_map_phys(dev, phys, size, dir, attrs); else if (use_dma_iommu(dev)) addr =3D iommu_dma_map_phys(dev, phys, size, dir, attrs); + else if (ops->map_phys) + addr =3D ops->map_phys(dev, phys, size, dir, attrs); else if (is_mmio) { if (!ops->map_resource) return DMA_MAPPING_ERROR; @@ -223,6 +225,8 @@ void dma_unmap_phys(struct device *dev, dma_addr_t addr= , size_t size, dma_direct_unmap_phys(dev, addr, size, dir, attrs); else if (use_dma_iommu(dev)) iommu_dma_unmap_phys(dev, addr, size, dir, attrs); + else if (ops->unmap_phys) + ops->unmap_phys(dev, addr, size, dir, attrs); else if (is_mmio) { if (ops->unmap_resource) ops->unmap_resource(dev, addr, size, dir, attrs); diff --git a/kernel/dma/ops_helpers.c b/kernel/dma/ops_helpers.c index 6f9d604d9d406..1eccbdbc99c1e 100644 --- a/kernel/dma/ops_helpers.c +++ b/kernel/dma/ops_helpers.c @@ -64,6 +64,7 @@ struct page *dma_common_alloc_pages(struct device *dev, s= ize_t size, { const struct dma_map_ops *ops =3D get_dma_ops(dev); struct page *page; + phys_addr_t phys; =20 page =3D dma_alloc_contiguous(dev, size, gfp); if (!page) @@ -71,9 +72,13 @@ struct page *dma_common_alloc_pages(struct device *dev, = size_t size, if (!page) return NULL; =20 + phys =3D page_to_phys(page); if (use_dma_iommu(dev)) - *dma_handle =3D iommu_dma_map_phys(dev, page_to_phys(page), size, - dir, DMA_ATTR_SKIP_CPU_SYNC); + *dma_handle =3D iommu_dma_map_phys(dev, phys, size, dir, + DMA_ATTR_SKIP_CPU_SYNC); + else if (ops->map_phys) + *dma_handle =3D ops->map_phys(dev, phys, size, dir, + DMA_ATTR_SKIP_CPU_SYNC); else *dma_handle =3D ops->map_page(dev, page, 0, size, dir, DMA_ATTR_SKIP_CPU_SYNC); @@ -94,6 +99,9 @@ void dma_common_free_pages(struct device *dev, size_t siz= e, struct page *page, if (use_dma_iommu(dev)) iommu_dma_unmap_phys(dev, dma_handle, size, dir, DMA_ATTR_SKIP_CPU_SYNC); + else if (ops->unmap_phys) + ops->unmap_phys(dev, dma_handle, size, dir, + DMA_ATTR_SKIP_CPU_SYNC); else if (ops->unmap_page) ops->unmap_page(dev, dma_handle, size, dir, DMA_ATTR_SKIP_CPU_SYNC); --=20 2.51.0