From: John Garry <john.garry@huawei.com>
To: <damien.lemoal@opensource.wdc.com>, <joro@8bytes.org>,
<will@kernel.org>, <jejb@linux.ibm.com>,
<martin.petersen@oracle.com>, <hch@lst.de>,
<m.szyprowski@samsung.com>, <robin.murphy@arm.com>
Cc: <linux-doc@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-ide@vger.kernel.org>, <iommu@lists.linux-foundation.org>,
<linux-scsi@vger.kernel.org>, <liyihang6@hisilicon.com>,
<chenxiang66@hisilicon.com>, <thunder.leizhen@huawei.com>,
John Garry <john.garry@huawei.com>
Subject: [PATCH v3 0/4] DMA mapping changes for SCSI core
Date: Mon, 6 Jun 2022 17:30:18 +0800 [thread overview]
Message-ID: <1654507822-168026-1-git-send-email-john.garry@huawei.com> (raw)
As reported in [0], DMA mappings whose size exceeds the IOMMU IOVA caching
limit may see a big performance hit.
This series introduces a new DMA mapping API, dma_opt_mapping_size(), so
that drivers may know this limit when performance is a factor in the
mapping.
Robin didn't like using dma_max_mapping_size() for this [1].
The SCSI core code is modified to use this limit.
I also added a patch for libata-scsi as it does not currently honour the
shost max_sectors limit.
Note: Christoph has previously kindly offered to take this series via the
dma-mapping tree, so I think that we just need an ack from the
IOMMU guys now.
[0] https://lore.kernel.org/linux-iommu/20210129092120.1482-1-thunder.leizhen@huawei.com/
[1] https://lore.kernel.org/linux-iommu/f5b78c9c-312e-70ab-ecbb-f14623a4b6e3@arm.com/
Changes since v2:
- Rebase on v5.19-rc1
- Add Damien's tag to 2/4 (thanks)
Changes since v1:
- Relocate scsi_add_host_with_dma() dma_dev check (Reported by Dan)
- Add tags from Damien and Martin (thanks)
- note: I only added Martin's tag to the SCSI patch
John Garry (4):
dma-mapping: Add dma_opt_mapping_size()
dma-iommu: Add iommu_dma_opt_mapping_size()
scsi: core: Cap shost max_sectors according to DMA optimum mapping
limits
libata-scsi: Cap ata_device->max_sectors according to
shost->max_sectors
Documentation/core-api/dma-api.rst | 9 +++++++++
drivers/ata/libata-scsi.c | 1 +
drivers/iommu/dma-iommu.c | 6 ++++++
drivers/iommu/iova.c | 5 +++++
drivers/scsi/hosts.c | 5 +++++
drivers/scsi/scsi_lib.c | 4 ----
include/linux/dma-map-ops.h | 1 +
include/linux/dma-mapping.h | 5 +++++
include/linux/iova.h | 2 ++
kernel/dma/mapping.c | 12 ++++++++++++
10 files changed, 46 insertions(+), 4 deletions(-)
--
2.26.2
next reply other threads:[~2022-06-06 9:36 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-06 9:30 John Garry [this message]
2022-06-06 9:30 ` [PATCH v3 1/4] dma-mapping: Add dma_opt_mapping_size() John Garry
2022-06-08 17:27 ` Bart Van Assche
2022-06-06 9:30 ` [PATCH v3 2/4] dma-iommu: Add iommu_dma_opt_mapping_size() John Garry
2022-06-08 17:26 ` Bart Van Assche
2022-06-08 17:39 ` John Garry
2022-06-14 13:12 ` John Garry
2022-06-23 8:38 ` John Garry
2022-06-06 9:30 ` [PATCH v3 3/4] scsi: core: Cap shost max_sectors according to DMA optimum mapping limits John Garry
2022-06-08 17:33 ` Bart Van Assche
2022-06-08 17:50 ` John Garry
2022-06-08 21:07 ` Bart Van Assche
2022-06-09 8:00 ` John Garry
2022-06-09 17:18 ` Bart Van Assche
2022-06-09 17:54 ` John Garry
2022-06-09 20:34 ` Bart Van Assche
2022-06-10 15:37 ` John Garry
2022-06-23 8:36 ` John Garry
2022-06-06 9:30 ` [PATCH v3 4/4] libata-scsi: Cap ata_device->max_sectors according to shost->max_sectors John Garry
2022-06-07 22:43 ` [PATCH v3 0/4] DMA mapping changes for SCSI core Bart Van Assche
2022-06-08 10:14 ` John Garry
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