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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to; bh=dv/wJr+V9NRV+lolRhI4CVLaEjJrVVBI8C3cibP+WBU=; b=OB+taTFJBzMCXiXMXBP34d8KdqggD/x42eqXqMMPyQ+x3OOkJPb1q+xSD8Wk7F1qCB pv5ljyTBjmqcOQWapXx/QxzMdHkxt3fQ65cUKsWQvxH7lKiq7xX0yFK9fDSwRYb8M9lz xCCSGYcQpcB1gEsWwKbR0IIlfuQNhnArE+3T5QPP98B2AtU8UiFJWVUE8pS1dYoyTu8w zNN6JiOv8LV+ASBgyLixpa3ObX2Bo/eXgbIoK+hOHBYG9tE8q2rCnvBeYpEC05aRxn/c c1nTHmtL9PVAZyFa7kXTiHCBur+q+1Za5TPj877YvLDGz/nwlQWN9C5X4R4lz45LvtW/ EuiQ== X-Gm-Message-State: AOAM532SKrpXa0gyaUVrO4N134HP+sSvLr66uDohyH7OP2wi0EsMa3RT Aiwyj2N9Jh38NtFuzQLx0EMGNmNTSw== X-Google-Smtp-Source: ABdhPJyh03Hh5IPZa/NXKVXEfxYK+v8U+Q/6t0H4LGYsfl6XIq6w4GCzICateDGeGMpAGtpLIcmYglBU8Q== X-Received: from jxgao.kir.corp.google.com ([2620:0:1008:11:695f:7f9e:413c:e3c7]) (user=jxgao job=sendgmr) by 2002:a17:90a:d58a:: with SMTP id v10mr196883pju.9.1612204223378; Mon, 01 Feb 2021 10:30:23 -0800 (PST) Date: Mon, 1 Feb 2021 10:30:15 -0800 In-Reply-To: <20210201183017.3339130-1-jxgao@google.com> Message-Id: <20210201183017.3339130-2-jxgao@google.com> Mime-Version: 1.0 References: <20210201183017.3339130-1-jxgao@google.com> X-Mailer: git-send-email 2.30.0.365.g02bc693789-goog Subject: [PATCH V2 1/3] Adding page_offset_mask to device_dma_parameters From: Jianxiong Gao To: jxgao@google.com, erdemaktas@google.com, marcorr@google.com, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, gregkh@linuxfoundation.org, saravanak@google.com, heikki.krogerus@linux.intel.com, rafael.j.wysocki@intel.com, andriy.shevchenko@linux.intel.com, dan.j.williams@intel.com, bgolaszewski@baylibre.com, jroedel@suse.de, iommu@lists.linux-foundation.org, konrad.wilk@oracle.com, kbusch@kernel.org, axboe@fb.com, sagi@grimberg.me, linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210201_133026_578634_5AE7C019 X-CRM114-Status: GOOD ( 18.13 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org Some devices rely on the address offset in a page to function correctly (NVMe driver as an example). These devices may use a different page size than the Linux kernel. The address offset has to be preserved upon mapping, and in order to do so, we need to record the page_offset_mask first. Signed-off-by: Jianxiong Gao --- include/linux/device.h | 1 + include/linux/dma-mapping.h | 17 +++++++++++++++++ 2 files changed, 18 insertions(+) diff --git a/include/linux/device.h b/include/linux/device.h index 1779f90eeb4c..7960bf516dd7 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -291,6 +291,7 @@ struct device_dma_parameters { * sg limitations. */ unsigned int max_segment_size; + unsigned int min_align_mask; unsigned long segment_boundary_mask; }; diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 2e49996a8f39..27ec3cab8cbd 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -500,6 +500,23 @@ static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask) return -EIO; } +static inline unsigned int dma_get_min_align_mask(struct device *dev) +{ + if (dev->dma_parms) + return dev->dma_parms->min_align_mask; + return 0; +} + +static inline int dma_set_min_align_mask(struct device *dev, + unsigned int min_align_mask) +{ + if (dev->dma_parms) { + dev->dma_parms->min_align_mask = min_align_mask; + return 0; + } + return -EIO; +} + static inline int dma_get_cache_alignment(void) { #ifdef ARCH_DMA_MINALIGN -- 2.27.0 _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme