[PATCH v12 2/4] uacce: add uacce driver

zhangfei zhangfei.gao at linaro.org
Tue Feb 11 18:59:08 AEDT 2020

On 2020/2/11 上午7:37, Greg Kroah-Hartman wrote:
> On Wed, Jan 15, 2020 at 10:12:46PM +0800, Zhangfei Gao wrote:
>> From: Kenneth Lee <liguozhu at hisilicon.com>
>> 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
>> only 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.
>> The IOMMU core only tracks mm<->device bonds at the moment, because it
>> only needs to handle IOTLB invalidation and PASID table entries. However
>> uacce needs a finer granularity since multiple queues from the same
>> device can be bound to an mm. When the mm exits, all bound queues must
>> be stopped so that the IOMMU can safely clear the PASID table entry and
>> reallocate the PASID.
>> An intermediate struct uacce_mm links uacce devices and queues.
>> Note that an mm may be bound to multiple devices but an uacce_mm
>> structure only ever belongs to a single device, because we don't need
>> anything more complex (if multiple devices are bound to one mm, then
>> we'll create one uacce_mm for each bond).
>>          uacce_device --+-- uacce_mm --+-- uacce_queue
>>                         |              '-- uacce_queue
>>                         |
>>                         '-- uacce_mm --+-- uacce_queue
>>                                        +-- uacce_queue
>>                                        '-- uacce_queue
>> Reviewed-by: Jonathan Cameron <Jonathan.Cameron at huawei.com>
>> Signed-off-by: Kenneth Lee <liguozhu at hisilicon.com>
>> Signed-off-by: Zaibo Xu <xuzaibo at huawei.com>
>> Signed-off-by: Zhou Wang <wangzhou1 at hisilicon.com>
>> Signed-off-by: Jean-Philippe Brucker <jean-philippe at linaro.org>
>> Signed-off-by: Zhangfei Gao <zhangfei.gao at linaro.org>
> Looks much saner now, thanks for all of the work on this:
> Reviewed-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
> Or am I supposed to take this in my tree?  If so, I can, but I need an
> ack for the crypto parts.
That's Great, thanks Greg.

For the convenience, I rebase the patchset on 5.6-rc1.
Not sure is there any conflict to crypto tree.
How about just pick the uacce part, patch 1 , 2.
We can resend the crypto part to crypto tree.


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