From nobody Sun Feb 8 12:18:53 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 AF23D2288CC; Mon, 10 Mar 2025 12:06:27 +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=1741608387; cv=none; b=Sg222sRLcomO5sV8GBdG54yI8GEvDA/lEiUzgPapDjpMO0izmtFBXqFs9X6Z5n6AYF9h0Z1iq82cShg1vQ2mV7PqDsL01Fz03Q7LgmZ2EDvchFW2KKAABKlwbBdfPXqR0N1rbnKrudAiGY6hphDzp8MRuoGK6Lo4TlRs/J5l7m4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741608387; c=relaxed/simple; bh=/UAL0ad49jcngOkD0mAWDzGa0d7QjTxM4lCTP33f5+4=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=WLkL9H4GJZfP59ij2XVdsCwc6xtCYwQeazvPjDYgbOvpH0sh+obdhQBwTOBQYDkc6oZdI6tWzt7wGzQmq5qcF+uydRwULw7P5UhgJwe6h0y+1guAmE9VKX98/cvDtWJbpbgr28bxamvKAENlTbzlRvOibZZgj1hxMUgglulXcro= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=h1Zf+ZM4; 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="h1Zf+ZM4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 94331C4CEEE; Mon, 10 Mar 2025 12:06:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741608387; bh=/UAL0ad49jcngOkD0mAWDzGa0d7QjTxM4lCTP33f5+4=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=h1Zf+ZM4Dqtwu1U4J20iOEAVrrphW+yhBnDr5d+g3qRKv+nXi4+U4z+zGiscHqgIJ jDUbDDfaU0xN3s3IiJ5iYy/hVOmEzoC1iGGqEHNpCp8k0y3nWsV/3ZM9vHvXRwVPo1 2fPoTnlS3G3ZT7vefqxhxsjm0yC480gMCoBAP0CQzdHflDKowuMalbQpcBBFbJZR64 fHQHlaX7dk9rale95FWC1Laqog0FtGsZ3ujKmR1n5j79GfIaWO7FkejT1/Y5sUk/61 WwaKkKvQBPqb1WZjg6GrWJF4c5AgBt/pcVmc1nSiiEMRyE4HaNlngnYtHlQ3A2gPmA h8d4CfRauzyXQ== From: Maxime Ripard Date: Mon, 10 Mar 2025 13:06:09 +0100 Subject: [PATCH RFC 03/12] dma: coherent: Register dmem region for each coherent 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-v1-3-2984c1bc9312@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=1940; i=mripard@kernel.org; h=from:subject:message-id; bh=/UAL0ad49jcngOkD0mAWDzGa0d7QjTxM4lCTP33f5+4=; b=owGbwMvMwCX2+D1vfrpE4FHG02pJDOnnrm7clPp7wa7PzbMebqtakmhdV8Nk65B7SrPty7XjK 546TVoQ31HKwiDGxSArpsgSI2y+JO7UrNedbHzzYOawMoEMYeDiFICJ6D9lZLjvfGnBE4fJ51rT XGQSXjNW8Zds/rg3XKTr0/Zcla3x38sZ/nsuda/5n79f3Cd/QfOtqvsy1hW2Zwvk/Y8uXZIpX33 FnAkA X-Developer-Key: i=mripard@kernel.org; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D There can be several coherent memory region in the system, and all of them might end up being used to allocate a DMA buffer. Let's register a dmem region for each of them to make sure we can track those allocations. Signed-off-by: Maxime Ripard --- kernel/dma/coherent.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/kernel/dma/coherent.c b/kernel/dma/coherent.c index 3b2bdca9f1d4b0274bf4874892b94730cd05c5df..2a2d515e43acbdef19c14d8840e= d90e48e7ebb43 100644 --- a/kernel/dma/coherent.c +++ b/kernel/dma/coherent.c @@ -5,10 +5,11 @@ */ #include #include #include #include +#include #include #include =20 struct dma_coherent_mem { void *virt_base; @@ -16,10 +17,12 @@ struct dma_coherent_mem { unsigned long pfn_base; int size; unsigned long *bitmap; spinlock_t spinlock; bool use_dev_dma_pfn_offset; + + struct dmem_cgroup_region *dmem_cgroup_region; }; =20 static inline struct dma_coherent_mem *dev_get_coherent_memory(struct devi= ce *dev) { if (dev && dev->dma_mem) @@ -335,16 +338,25 @@ static phys_addr_t dma_reserved_default_memory_size _= _initdata; #endif =20 static int rmem_dma_device_init(struct reserved_mem *rmem, struct device *= dev) { if (!rmem->priv) { + struct dmem_cgroup_region *region; struct dma_coherent_mem *mem; =20 mem =3D dma_init_coherent_memory(rmem->base, rmem->base, rmem->size, true); if (IS_ERR(mem)) return PTR_ERR(mem); + + region =3D dmem_cgroup_register_region(rmem->size, + "dma/coherent/%s", + rmem->name); + if (IS_ERR(region)) + return PTR_ERR(region); + + mem->dmem_cgroup_region =3D region; rmem->priv =3D mem; } dma_assign_coherent_memory(dev, rmem->priv); return 0; } --=20 2.48.1