linux-kernel - [PATCH RFC 02/12] cma: Provide accessor to cma dmem region

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Message-Id: <20250310-dmem-cgroups-v1-2-2984c1bc9312@kernel.org>
Date: Mon, 10 Mar 2025 13:06:08 +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 02/12] cma: Provide accessor to cma dmem region

Consumers of the CMA API will have to know which CMA 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 <mripard@...nel.org>
---
 include/linux/cma.h | 9 +++++++++
 mm/cma.c            | 7 +++++++
 2 files changed, 16 insertions(+)

diff --git a/include/linux/cma.h b/include/linux/cma.h
index d15b64f51336df18d17a4097e27961fd1ac8d79f..d7b2f13918e536aeb8bccebc1934d36f2f0b4cf4 100644
--- a/include/linux/cma.h
+++ b/include/linux/cma.h
@@ -66,6 +66,15 @@ static inline bool cma_free_folio(struct cma *cma, const struct folio *folio)
 {
 	return false;
 }
 #endif

+#if IS_ENABLED(CONFIG_CGROUP_DMEM)
+struct dmem_cgroup_region *cma_get_dmem_cgroup_region(struct cma *cma);
+#else /* CONFIG_CGROUP_DMEM */
+static inline struct dmem_cgroup_region *cma_get_dmem_cgroup_region(struct cma *cma)
+{
+	return NULL;
+}
+#endif /* CONFIG_CGROUP_DMEM */
+
 #endif
diff --git a/mm/cma.c b/mm/cma.c
index 41a9ae907dcf69a73e963830d2c5f589dfc44f22..4973a8c6bacb9d4924f4969be07757cf631304b8 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -49,10 +49,17 @@ unsigned long cma_get_size(const struct cma *cma)
 const char *cma_get_name(const struct cma *cma)
 {
 	return cma->name;
 }

+#if IS_ENABLED(CONFIG_CGROUP_DMEM)
+struct dmem_cgroup_region *cma_get_dmem_cgroup_region(struct cma *cma)
+{
+	return cma->dmem_cgrp_region;
+}
+#endif /* CONFIG_CGROUP_DMEM */
+
 static unsigned long cma_bitmap_aligned_mask(const struct cma *cma,
 					     unsigned int align_order)
 {
 	if (align_order <= cma->order_per_bit)
 		return 0;

-- 
2.48.1