From: Jianxiong Gao <jxgao@google.com>
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
Subject: [PATCH V2 1/3] Adding page_offset_mask to device_dma_parameters
Date: Mon, 1 Feb 2021 10:30:15 -0800 [thread overview]
Message-ID: <20210201183017.3339130-2-jxgao@google.com> (raw)
In-Reply-To: <20210201183017.3339130-1-jxgao@google.com>
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 <jxgao@google.com>
---
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
next prev parent reply other threads:[~2021-02-01 18:34 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-01 18:30 [PATCH V2 0/3] SWIOTLB: Preserve swiotlb map offset when needed Jianxiong Gao
2021-02-01 18:30 ` Jianxiong Gao [this message]
2021-02-01 18:30 ` [PATCH V2 2/3] Add swiotlb offset preserving mapping when dma_dma_parameters->page_offset_mask is non zero Jianxiong Gao
2021-02-01 18:30 ` [PATCH V2 3/3] Adding device_dma_parameters->offset_preserve_mask to NVMe driver Jianxiong Gao
2021-02-01 18:55 ` Andy Shevchenko
2021-02-01 19:35 ` Jianxiong Gao
2021-02-01 20:57 ` Keith Busch
[not found] ` <CAMGD6P2Gz9nWELMdsAhwQvXx3PXv2aXet=Tn9Rca61obZawfgw@mail.gmail.com>
2021-02-01 21:22 ` Jianxiong Gao
2021-02-01 23:59 ` Chaitanya Kulkarni
2021-02-02 0:25 ` Jianxiong Gao
2021-02-02 11:21 ` Andy Shevchenko
2021-02-02 12:07 ` Robin Murphy
2021-02-03 13:37 ` Christoph Hellwig
2021-02-03 16:47 ` Jianxiong Gao
2021-02-02 11:53 ` [PATCH V2 0/3] SWIOTLB: Preserve swiotlb map offset when needed Greg KH
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