From nobody Sun Feb 8 10:34:01 2026 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 742E5229B23; Mon, 10 Mar 2025 12:06:30 +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=1741608390; cv=none; b=r1W/4pVgmoYmSJvDRlMVVHIpWteofNLZWN1jE7dGgRxh5J05DDgyp1M2iikHM0L7wl+/1wsFzUHo/fCt8qpHWP9vYa47OD863gjA+dGbQ6Cwwxs2niXZ9fZ90HKDNOHD0d4vsduvxD8Ubf5WDD0I8Wk0TLllh1noLori1Byapc4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741608390; c=relaxed/simple; bh=MHX69KTowxgUBaIq2U0nJk1Dh2Qpf931EJ3Gm20lDzU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=tHaRBJAyYAMpCHBPhRKHTop88lvGiPAWCiIvv4NAJhYmrEGr83sw7z5H4HVQ+9oFVEWmFJ10MX14wzQTkzo9KkE1SFGsuvjnl1l5nriKEdDhlwRWDOqu7Ijz7vG9pPK/JFpZScN1R1OcmJCpRyQPW4FftmmawpQdBMdJ+BSgAIE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Fd8MwOI6; 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="Fd8MwOI6" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 59344C4CEED; Mon, 10 Mar 2025 12:06:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741608389; bh=MHX69KTowxgUBaIq2U0nJk1Dh2Qpf931EJ3Gm20lDzU=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Fd8MwOI6Gr4g8BxyrBDoPe5CkR6LxWSS86cWJnaVKQOIKhwpyInBkAsVLEqZkg+Wb 92kysW/uU1DvJxhXvHDYryxQcl3F3RW8iCg7E3r49YcFoC0joeuTsIlwEf2tyc1CNQ bm5BMdZG6Wdemat7usQFs9xfPoIcoavti+dtm/KPA+l8DVWGohgUkhECakNgp7YyGk skf2qKyhtWb0v7FHzEEToVkb+KYzmvqOptZkOO/efesCe/PhU/vWxW3fznUnDzM+TC 4fJfyO59HAxcIcLLolGaqV65cB2wXS0MRBKmBdOFpi+X98F+pVQCGw+kCDg250k8t5 HlmHQEHBVHCbQ== From: Maxime Ripard Date: Mon, 10 Mar 2025 13:06:10 +0100 Subject: [PATCH RFC 04/12] dma: coherent: Provide accessor to dmem region Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250310-dmem-cgroups-v1-4-2984c1bc9312@kernel.org> References: <20250310-dmem-cgroups-v1-0-2984c1bc9312@kernel.org> In-Reply-To: <20250310-dmem-cgroups-v1-0-2984c1bc9312@kernel.org> To: Andrew Morton , Marek Szyprowski , Robin Murphy , Sumit Semwal , =?utf-8?q?Christian_K=C3=B6nig?= , Benjamin Gaignard , Brian Starkey , John Stultz , "T.J. Mercier" , Maarten Lankhorst , Thomas Zimmermann , David Airlie , Simona Vetter , Tomasz Figa , Mauro Carvalho Chehab Cc: Hans Verkuil , Laurent Pinchart , linux-mm@kvack.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, Maxime Ripard X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=2413; i=mripard@kernel.org; h=from:subject:message-id; bh=MHX69KTowxgUBaIq2U0nJk1Dh2Qpf931EJ3Gm20lDzU=; b=owGbwMvMwCX2+D1vfrpE4FHG02pJDOnnrm56E/7yxj4HNfHYzFPqWVsnsExuXHlz2uHEp0wf5 4tcjNRa11HCwiDGxSArpsgSI2y+JO7UrNedbHzzYOawMoEMYeDiFICJCF9k+B899/qseSLBUSsv u3VNuPdaYHmEpcNpV5fGg7++GJWmq6sx/LgUnqF8xVvbKyHQrUnf1ZLllVSE0cWvT9SnbvsRnOj NCAA= X-Developer-Key: i=mripard@kernel.org; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D Consumers of the coherent DMA API will have to know which coherent region their device allocate from in order for them to charge the memory allocation in the right one. Let's provide an accessor for that region. Signed-off-by: Maxime Ripard --- include/linux/dma-map-ops.h | 11 +++++++++++ kernel/dma/coherent.c | 14 ++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h index e172522cd93651594607e16461fac56e4d67cbce..a2c10ed186efb6e08f64df0954b= 4d389589b6e35 100644 --- a/include/linux/dma-map-ops.h +++ b/include/linux/dma-map-ops.h @@ -199,10 +199,21 @@ static inline int dma_mmap_from_global_coherent(struc= t vm_area_struct *vma, { return 0; } #endif /* CONFIG_DMA_GLOBAL_POOL */ =20 +#if IS_ENABLED(CONFIG_CGROUP_DMEM) && IS_ENABLED(CONFIG_DMA_DECLARE_COHERE= NT) +struct dmem_cgroup_region * +dma_coherent_get_dmem_cgroup_region(struct device *dev); +#else /* CONFIG_CGROUP_DMEM && CONFIG_DMA_DECLARE_COHERENT */ +static inline struct dmem_cgroup_region * +dma_coherent_get_dmem_cgroup_region(struct device *dev) +{ + return NULL; +} +#endif /* CONFIG_CGROUP_DMEM && CONFIG_DMA_DECLARE_COHERENT */ + int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, void *cpu_addr, dma_addr_t dma_addr, size_t size, unsigned long attrs); int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, dma_addr_t dma_addr, size_t size, diff --git a/kernel/dma/coherent.c b/kernel/dma/coherent.c index 2a2d515e43acbdef19c14d8840ed90e48e7ebb43..74c5ff5105110487770c1b73812= eefe8b3d7eb3c 100644 --- a/kernel/dma/coherent.c +++ b/kernel/dma/coherent.c @@ -28,10 +28,24 @@ static inline struct dma_coherent_mem *dev_get_coherent= _memory(struct device *de if (dev && dev->dma_mem) return dev->dma_mem; return NULL; } =20 +#if IS_ENABLED(CONFIG_CGROUP_DMEM) +struct dmem_cgroup_region * +dma_coherent_get_dmem_cgroup_region(struct device *dev) +{ + struct dma_coherent_mem *mem; + + mem =3D dev_get_coherent_memory(dev); + if (!mem) + return NULL; + + return mem->dmem_cgroup_region; +} +#endif + static inline dma_addr_t dma_get_device_base(struct device *dev, struct dma_coherent_mem * mem) { if (mem->use_dev_dma_pfn_offset) return phys_to_dma(dev, PFN_PHYS(mem->pfn_base)); --=20 2.48.1