linux-kernel - [PATCH V5 0/2] Change vring space from nomal memory to dma coherent memory

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Date:   Wed, 28 Oct 2020 10:03:03 +0800
From:   Sherry Sun <sherry.sun@....com>
To:     hch@...radead.org, gregkh@...uxfoundation.org,
        vincent.whitchurch@...s.com, sudeep.dutt@...el.com,
        ashutosh.dixit@...el.com, arnd@...db.de, kishon@...com,
        lorenzo.pieralisi@....com
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-imx@....com, fugang.duan@....com
Subject: [PATCH V5 0/2] Change vring space from nomal memory to dma coherent memory

Changes in V5:
1. Reorganize the vop_mmap function code in patch 1, which is done by Christoph. 
2. Completely remove the unnecessary code related to reassign the used ring for
card in patch 2.

The original vop driver only supports dma coherent device, as it allocates and
maps vring by _get_free_pages and dma_map_single, but not use 
dma_sync_single_for_cpu/device to sync the updates of device_page/vring between
EP and RC, which will cause memory synchronization problem for device don't
support hardware dma coherent.

And allocate vrings use dma_alloc_coherent is a common way in kernel, as the
memory interacted between two systems should use consistent memory to avoid
caching effects. So here add noncoherent platform support for vop driver.
Also add some related dma changes to make sure noncoherent platform works
well.

Sherry Sun (2):
  misc: vop: change the way of allocating vrings and device page
  misc: vop: do not allocate and reassign the used ring

 drivers/misc/mic/bus/vop_bus.h     |   2 +
 drivers/misc/mic/host/mic_boot.c   |   9 ++
 drivers/misc/mic/host/mic_main.c   |  43 ++------
 drivers/misc/mic/vop/vop_debugfs.c |   4 -
 drivers/misc/mic/vop/vop_main.c    |  70 +-----------
 drivers/misc/mic/vop/vop_vringh.c  | 166 ++++++++++-------------------
 include/uapi/linux/mic_common.h    |   9 +-
 7 files changed, 85 insertions(+), 218 deletions(-)

-- 
2.17.1