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Mon, 04 May 2026 17:27:41 -0700 (PDT) Date: Tue, 5 May 2026 00:27:35 +0000 In-Reply-To: <20260505002737.2213734-1-skhawaja@google.com> Mime-Version: 1.0 References: <20260505002737.2213734-1-skhawaja@google.com> X-Mailer: git-send-email 2.54.0.545.g6539524ca2-goog Message-ID: <20260505002737.2213734-3-skhawaja@google.com> Subject: [RFC PATCH 2/4] dma/pool: Add an API to check if DMA allocation is from pool From: Samiullah Khawaja To: Marek Szyprowski , Will Deacon , Jason Gunthorpe Cc: Samiullah Khawaja , Pasha Tatashin , Mike Rapoport , Pratyush Yadav , Alexander Graf , Robin Murphy , Kevin Tian , iommu@lists.linux.dev, kexec@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, David Matlack , Andrew Morton , Pranjal Shrivastava , Vipin Sharma Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260504_172743_591287_857D6FE7 X-CRM114-Status: GOOD ( 11.06 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org DMA allocations can be done through DMA pools, add an API that can be used to check if an allocation is done from a pool. This will be used in the later commit during preservation of DMA allocation. Signed-off-by: Samiullah Khawaja --- include/linux/dma-map-ops.h | 1 + kernel/dma/pool.c | 13 +++++++++++++ 2 files changed, 14 insertions(+) diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h index 6a1832a73cad..6a0bc4ea2467 100644 --- a/include/linux/dma-map-ops.h +++ b/include/linux/dma-map-ops.h @@ -216,6 +216,7 @@ struct page *dma_alloc_from_pool(struct device *dev, size_t size, bool (*phys_addr_ok)(struct device *, phys_addr_t, size_t)); bool dma_free_from_pool(struct device *dev, void *start, size_t size); +bool dma_is_from_pool(struct device *dev, void *start, size_t size); int dma_direct_set_offset(struct device *dev, phys_addr_t cpu_start, dma_addr_t dma_start, u64 size); diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c index 2b2fbb709242..32ce4d6d7683 100644 --- a/kernel/dma/pool.c +++ b/kernel/dma/pool.c @@ -307,3 +307,16 @@ bool dma_free_from_pool(struct device *dev, void *start, size_t size) return false; } + +bool dma_is_from_pool(struct device *dev, void *start, size_t size) +{ + struct gen_pool *pool = NULL; + + while ((pool = dma_guess_pool(pool, 0))) { + if (!gen_pool_has_addr(pool, (unsigned long)start, size)) + continue; + return true; + } + + return false; +} -- 2.54.0.545.g6539524ca2-goog