On 10/11/2020 08:10, Song Bao Hua (Barry Song) wrote:
Hello Robin, Christoph,
Any further comment? John suggested that "depends on DEBUG_FS" should be added
in Kconfig.
I am collecting more comments to send v4 together with fixing this minor issue
:-)
Thanks
Barry
-----Original Message-----
From: Song Bao Hua (Barry Song)
Sent: Monday, November 2, 2020 9:07 PM
To: iommu@lists.linux-foundation.org; h...@lst.de; robin.mur...@arm.com;
m.szyprow...@samsung.com
Cc: Linuxarm <linux...@huawei.com>; linux-kselft...@vger.kernel.org; xuwei
(O) <xuw...@huawei.com>; Song Bao Hua (Barry Song)
<song.bao....@hisilicon.com>; Joerg Roedel <j...@8bytes.org>; Will Deacon
<w...@kernel.org>; Shuah Khan <sh...@kernel.org>
Subject: [PATCH v3 1/2] dma-mapping: add benchmark support for streaming
DMA APIs
Nowadays, there are increasing requirements to benchmark the performance
of dma_map and dma_unmap particually while the device is attached to an
IOMMU.
This patch enables the support. Users can run specified number of threads to
do dma_map_page and dma_unmap_page on a specific NUMA node with the
specified duration. Then dma_map_benchmark will calculate the average
latency for map and unmap.
A difficulity for this benchmark is that dma_map/unmap APIs must run on a
particular device. Each device might have different backend of IOMMU or
non-IOMMU.
So we use the driver_override to bind dma_map_benchmark to a particual
device by:
For platform devices:
echo dma_map_benchmark > /sys/bus/platform/devices/xxx/driver_override
echo xxx > /sys/bus/platform/drivers/xxx/unbind
echo xxx > /sys/bus/platform/drivers/dma_map_benchmark/bind
Hi Barry,
For PCI devices:
echo dma_map_benchmark >
/sys/bus/pci/devices/0000:00:01.0/driver_override
echo 0000:00:01.0 > /sys/bus/pci/drivers/xxx/unbind echo 0000:00:01.0 >
/sys/bus/pci/drivers/dma_map_benchmark/bind
Do we need to check if the device to which we attach actually has DMA
mapping capability?
Cc: Joerg Roedel <j...@8bytes.org>
Cc: Will Deacon <w...@kernel.org>
Cc: Shuah Khan <sh...@kernel.org>
Cc: Christoph Hellwig <h...@lst.de>
Cc: Marek Szyprowski <m.szyprow...@samsung.com>
Cc: Robin Murphy <robin.mur...@arm.com>
Signed-off-by: Barry Song <song.bao....@hisilicon.com>
---
Thanks,
John
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