Re: [PATCH v3 2/2] uacce: add uacce driver

From: zhangfei
Date: Thu Sep 12 2019 - 10:09:52 EST

On 2019/9/4 äå8:38, Greg Kroah-Hartman wrote:
On Tue, Sep 03, 2019 at 12:14:47PM +0800, Zhangfei Gao wrote:
From: Kenneth Lee <liguozhu@xxxxxxxxxxxxx>

Uacce (Unified/User-space-access-intended Accelerator Framework) targets to
provide Shared Virtual Addressing (SVA) between accelerators and processes.
So accelerator can access any data structure of the main cpu.
This differs from the data sharing between cpu and io device, which share
data content rather than address.
Since unified address, hardware and user space of process can share the
same virtual address in the communication.

Uacce create a chrdev for every registration, the queue is allocated to
the process when the chrdev is opened. Then the process can access the
hardware resource by interact with the queue file. By mmap the queue
file space to user space, the process can directly put requests to the
hardware without syscall to the kernel space.

Signed-off-by: Kenneth Lee <liguozhu@xxxxxxxxxxxxx>
Signed-off-by: Zaibo Xu <xuzaibo@xxxxxxxxxx>
Signed-off-by: Zhou Wang <wangzhou1@xxxxxxxxxxxxx>
Signed-off-by: Zhangfei Gao <zhangfei.gao@xxxxxxxxxx>
Documentation/ABI/testing/sysfs-driver-uacce | 47 ++
drivers/misc/Kconfig | 1 +
drivers/misc/Makefile | 1 +
drivers/misc/uacce/Kconfig | 13 +
drivers/misc/uacce/Makefile | 2 +
drivers/misc/uacce/uacce.c | 1096 ++++++++++++++++++++++++++
include/linux/uacce.h | 172 ++++
include/uapi/misc/uacce.h | 39 +
8 files changed, 1371 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-driver-uacce
create mode 100644 drivers/misc/uacce/Kconfig
create mode 100644 drivers/misc/uacce/Makefile
create mode 100644 drivers/misc/uacce/uacce.c
create mode 100644 include/linux/uacce.h
create mode 100644 include/uapi/misc/uacce.h

diff --git a/Documentation/ABI/testing/sysfs-driver-uacce b/Documentation/ABI/testing/sysfs-driver-uacce
new file mode 100644
index 0000000..ee0a66e
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-driver-uacce
@@ -0,0 +1,47 @@
+What: /sys/class/uacce/hisi_zip-<n>/id
+Date: Sep 2019
+KernelVersion: 5.3
5.3 will be released in a week or so, without this file in it, so that's
not ok here :(

Thanks, will use 5.4 instead.
Since 5.4-rc1 still need some time, can I send updated version based on 5.3-rc8 for more review.
And I found smmu in 5.3-rc1 have issue, and rc8 is OK.