linux-kernel - [PATCH RFC 05/12] dma: contiguous: Provide accessor to dmem region

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Message-Id: <20250310-dmem-cgroups-v1-5-2984c1bc9312@kernel.org>
Date: Mon, 10 Mar 2025 13:06:11 +0100
From: Maxime Ripard <mripard@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>, 
 Marek Szyprowski <m.szyprowski@...sung.com>, 
 Robin Murphy <robin.murphy@....com>, Sumit Semwal <sumit.semwal@...aro.org>, 
 Christian König <christian.koenig@....com>, 
 Benjamin Gaignard <benjamin.gaignard@...labora.com>, 
 Brian Starkey <Brian.Starkey@....com>, John Stultz <jstultz@...gle.com>, 
 "T.J. Mercier" <tjmercier@...gle.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
 Simona Vetter <simona@...ll.ch>, Tomasz Figa <tfiga@...omium.org>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: Hans Verkuil <hverkuil@...all.nl>, 
 Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>, 
 linux-mm@...ck.org, linux-kernel@...r.kernel.org, iommu@...ts.linux.dev, 
 linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 linaro-mm-sig@...ts.linaro.org, Maxime Ripard <mripard@...nel.org>
Subject: [PATCH RFC 05/12] dma: contiguous: Provide accessor to dmem region

Consumers of the DMA contiguous API will have to know which region their
device allocates 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 <mripard@...nel.org>
---
 include/linux/dma-map-ops.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h
index a2c10ed186efb6e08f64df0954b4d389589b6e35..bfc928d3bac37f3eece93d152abd57da513a1cc8 100644
--- a/include/linux/dma-map-ops.h
+++ b/include/linux/dma-map-ops.h
@@ -4,10 +4,11 @@
  * It should not be included in drivers just using the DMA API.
  */
 #ifndef _LINUX_DMA_MAP_OPS_H
 #define _LINUX_DMA_MAP_OPS_H

+#include <linux/cma.h>
 #include <linux/dma-mapping.h>
 #include <linux/pgtable.h>
 #include <linux/slab.h>

 struct cma;
@@ -153,10 +154,30 @@ static inline void dma_free_contiguous(struct device *dev, struct page *page,
 {
 	__free_pages(page, get_order(size));
 }
 #endif /* CONFIG_DMA_CMA*/

+#if IS_ENABLED(CONFIG_DMA_CMA) && IS_ENABLED(CONFIG_CGROUP_DMEM)
+
+static inline struct dmem_cgroup_region *
+dma_contiguous_get_dmem_cgroup_region(struct device *dev)
+{
+	struct cma *cma = dev_get_cma_area(dev);
+
+	return cma_get_dmem_cgroup_region(cma);
+}
+
+#else /* IS_ENABLED(CONFIG_DMA_CMA) && IS_ENABLED(CONFIG_CGROUP_DMEM) */
+
+static inline struct dmem_cgroup_region *
+dma_contiguous_get_dmem_cgroup_region(struct device *dev)
+{
+	return NULL;
+}
+
+#endif /* IS_ENABLED(CONFIG_DMA_CMA) && IS_ENABLED(CONFIG_CGROUP_DMEM) */
+
 #ifdef CONFIG_DMA_DECLARE_COHERENT
 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 		dma_addr_t device_addr, size_t size);
 void dma_release_coherent_memory(struct device *dev);
 int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size,

-- 
2.48.1