linux-kernel - [PATCH v3 0/4] support USB offload feature

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Message-Id: <1647853194-62147-1-git-send-email-dh10.jung@samsung.com>
Date:   Mon, 21 Mar 2022 17:59:50 +0900
From:   Daehwan Jung <dh10.jung@...sung.com>
To:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org (open list:USB XHCI DRIVER),
        linux-kernel@...r.kernel.org (open list),
        Howard Yen <howardyen@...gle.com>,
        Jack Pham <jackp@...eaurora.org>,
        Puma Hsu <pumahsu@...gle.com>,
        "J . Avila" <elavila@...gle.com>,
        Daehwan Jung <dh10.jung@...sung.com>, sc.suh@...sung.com
Subject: [PATCH v3 0/4] support USB offload feature

This patchset is for USB offload feature, which makes Co-processor to use
some memories of xhci. Especially it's useful for USB Audio scenario.
Audio stream would get shortcut because Co-processor directly write/read
data in xhci memories. It could get speed-up using faster memory like SRAM.
That's why this gives vendors flexibilty of memory management.
Several pathches have been merged in AOSP kernel(android12-5.10) and I put
together and split into 3 patches. Plus let me add user(xhci-exynos)
module to see how user could use it.

To sum up, it's for providing xhci memories to Co-Processor.
It would cover DCBAA, Device Context, Transfer Ring, Event Ring, ERST.
It needs xhci hooks and to export some xhci symbols.

Changes in v2 :
- Fix commit message by adding Signed-off-by in each patch.
- Fix conflict on latest.

Changes in v3 :
- Remove export symbols and xhci hooks which xhci-exynos don't need.
- Modify commit message to clarify why it needs to export symbols.
- Check compiling of xhci-exynos.

Daehwan Jung (4):
  usb: host: export symbols for xhci hooks usage
  usb: host: add xhci hooks for USB offload
  usb: host: add some to xhci overrides for USB offload
  usb: host: add xhci-exynos driver

 drivers/usb/host/Kconfig       |   9 +
 drivers/usb/host/Makefile      |   1 +
 drivers/usb/host/xhci-exynos.c | 982 +++++++++++++++++++++++++++++++++
 drivers/usb/host/xhci-exynos.h |  63 +++
 drivers/usb/host/xhci-hub.c    |   7 +
 drivers/usb/host/xhci-mem.c    | 150 ++++-
 drivers/usb/host/xhci-plat.c   |  43 +-
 drivers/usb/host/xhci-plat.h   |   7 +
 drivers/usb/host/xhci-ring.c   |   1 +
 drivers/usb/host/xhci.c        |  90 ++-
 drivers/usb/host/xhci.h        |  50 ++
 11 files changed, 1379 insertions(+), 24 deletions(-)
 create mode 100644 drivers/usb/host/xhci-exynos.c
 create mode 100644 drivers/usb/host/xhci-exynos.h

-- 
2.31.1