linux-kernel - [PATCH RFC 07/12] dma: Create default dmem region for DMA allocations

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Message-Id: <20250310-dmem-cgroups-v1-7-2984c1bc9312@kernel.org>
Date: Mon, 10 Mar 2025 13:06:13 +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 07/12] dma: Create default dmem region for DMA
 allocations

Some DMA allocations are not going to be performed through dedicated
sub-allocators but using the default path. We need to create a default
region to track those as well.

Signed-off-by: Maxime Ripard <mripard@...nel.org>
---
 kernel/dma/mapping.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index cda127027e48a757f2d9fb04a49249d2b0238871..7bc3957512fd84e0bf3a89c210338be72457b5c9 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -5,10 +5,11 @@
  * Copyright (c) 2006  SUSE Linux Products GmbH
  * Copyright (c) 2006  Tejun Heo <teheo@...e.de>
  */
 #include <linux/memblock.h> /* for max_pfn */
 #include <linux/acpi.h>
+#include <linux/cgroup_dmem.h>
 #include <linux/dma-map-ops.h>
 #include <linux/export.h>
 #include <linux/gfp.h>
 #include <linux/iommu-dma.h>
 #include <linux/kmsan.h>
@@ -25,10 +26,14 @@
 	defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
 	defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
 bool dma_default_coherent = IS_ENABLED(CONFIG_ARCH_DMA_DEFAULT_COHERENT);
 #endif

+#if IS_ENABLED(CONFIG_CGROUP_DMEM)
+static struct dmem_cgroup_region *default_dmem_cgroup_region;
+#endif
+
 /*
  * Managed DMA API
  */
 struct dma_devres {
 	size_t		size;
@@ -587,10 +592,28 @@ u64 dma_get_required_mask(struct device *dev)
 	 */
 	return DMA_BIT_MASK(32);
 }
 EXPORT_SYMBOL_GPL(dma_get_required_mask);

+#if IS_ENABLED(CONFIG_CGROUP_DMEM)
+static int __init dma_init_dmem_cgroup(void)
+{
+	struct dmem_cgroup_region *region;
+
+	if (default_dmem_cgroup_region)
+		return -EBUSY;
+
+	region = dmem_cgroup_register_region(U64_MAX, "dma/global");
+	if (IS_ERR(region))
+		return PTR_ERR(region);
+
+	default_dmem_cgroup_region = region;
+	return 0;
+}
+core_initcall(dma_init_dmem_cgroup);
+#endif
+
 void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle,
 		gfp_t flag, unsigned long attrs)
 {
 	const struct dma_map_ops *ops = get_dma_ops(dev);
 	void *cpu_addr;

-- 
2.48.1