linux-kernel - [RFC 4/6] dma-buf: Add DMA-BUF exporter op to charge a DMA-BUF to a cgroup.

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Date:   Fri, 14 Jan 2022 17:06:02 -0800
From:   Hridya Valsaraju <hridya@...gle.com>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonathan Corbet <corbet@....net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Arve Hjønnevåg" <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Christian Brauner <christian@...uner.io>,
        Hridya Valsaraju <hridya@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Liam Mark <lmark@...eaurora.org>,
        Laura Abbott <labbott@...hat.com>,
        Brian Starkey <Brian.Starkey@....com>,
        John Stultz <john.stultz@...aro.org>,
        "Christian König" <christian.koenig@....com>,
        Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Dave Airlie <airlied@...hat.com>,
        Jason Ekstrand <jason@...kstrand.net>,
        Matthew Auld <matthew.auld@...el.com>,
        Matthew Brost <matthew.brost@...el.com>,
        Li Li <dualli@...gle.com>, Marco Ballesio <balejs@...gle.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Hang Lu <hangl@...eaurora.org>,
        Wedson Almeida Filho <wedsonaf@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Chris Down <chris@...isdown.name>,
        Vipin Sharma <vipinsh@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Vlastimil Babka <vbabka@...e.cz>,
        Arnd Bergmann <arnd@...db.de>, dri-devel@...ts.freedesktop.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org,
        cgroups@...r.kernel.org
Cc:     Kenny.Ho@....com, daniels@...labora.com, kaleshsingh@...gle.com,
        tjmercier@...gle.com
Subject: [RFC 4/6] dma-buf: Add DMA-BUF exporter op to charge a DMA-BUF to a cgroup.

The optional exporter op provides a way for processes to transfer
charge of a buffer to a different process. This is essential for the
cases where a central allocator process does allocations for various
subsystems, hands over the fd to the client who
requested the memory and drops all references to the allocated memory.

Signed-off-by: Hridya Valsaraju <hridya@...gle.com>
---
 include/linux/dma-buf.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
index 7ab50076e7a6..d5e52f81cc6f 100644
--- a/include/linux/dma-buf.h
+++ b/include/linux/dma-buf.h
@@ -13,6 +13,7 @@
 #ifndef __DMA_BUF_H__
 #define __DMA_BUF_H__
 
+#include <linux/cgroup_gpu.h>
 #include <linux/dma-buf-map.h>
 #include <linux/file.h>
 #include <linux/err.h>
@@ -285,6 +286,23 @@ struct dma_buf_ops {
 
 	int (*vmap)(struct dma_buf *dmabuf, struct dma_buf_map *map);
 	void (*vunmap)(struct dma_buf *dmabuf, struct dma_buf_map *map);
+
+	/**
+	 * @charge_to_cgroup:
+	 *
+	 * This is called by an exporter to charge a buffer to the specified
+	 * cgroup. The caller must hold a reference to @gpucg obtained via
+	 * gpucg_get(). The DMA-BUF will be uncharged from the cgroup it is
+	 * currently charged to before being charged to @gpucg. The caller must
+	 * belong to the cgroup the buffer is currently charged to.
+	 *
+	 * This callback is optional.
+	 *
+	 * Returns:
+	 *
+	 * 0 on success or negative error code on failure.
+	 */
+	int (*charge_to_cgroup)(struct dma_buf *dmabuf, struct gpucg *gpucg);
 };
 
 /**
-- 
2.34.1.703.g22d0c6ccf7-goog