On Wed, Nov 14, 2018 at 10:58:09AM +0800, Kenneth Lee wrote: > > 在 2018/11/13 上午8:23, Leon Romanovsky 写道: > > On Mon, Nov 12, 2018 at 03:58:02PM +0800, Kenneth Lee wrote: > > > From: Kenneth Lee <liguo...@hisilicon.com> > > > > > > WarpDrive is a general accelerator framework for the user application to > > > access the hardware without going through the kernel in data path. > > > > > > The kernel component to provide kernel facility to driver for expose the > > > user interface is called uacce. It a short name for > > > "Unified/User-space-access-intended Accelerator Framework". > > > > > > This patch add document to explain how it works. > > + RDMA and netdev folks > > > > Sorry, to be late in the game, I don't see other patches, but from > > the description below it seems like you are reinventing RDMA verbs > > model. I have hard time to see the differences in the proposed > > framework to already implemented in drivers/infiniband/* for the kernel > > space and for the https://github.com/linux-rdma/rdma-core/ for the user > > space parts. > > Thanks Leon, > > Yes, we tried to solve similar problem in RDMA. We also learned a lot from > the exist code of RDMA. But we we have to make a new one because we cannot > register accelerators such as AI operation, encryption or compression to the > RDMA framework:)
Assuming that you did everything right and still failed to use RDMA framework, you was supposed to fix it and not to reinvent new exactly same one. It is how we develop kernel, by reusing existing code. > > Another problem we tried to address is the way to pin the memory for dma > operation. The RDMA way to pin the memory cannot avoid the page lost due to > copy-on-write operation during the memory is used by the device. This may > not be important to RDMA library. But it is important to accelerator. Such support exists in drivers/infiniband/ from late 2014 and it is called ODP (on demand paging). > > Hope this can help the understanding. Yes, it helped me a lot. Now, I'm more than before convinced that this whole patchset shouldn't exist in the first place. To be clear, NAK. Thanks > > Cheers > > > > > Hard NAK from RDMA side. > > > > Thanks > > > > > Signed-off-by: Kenneth Lee <liguo...@hisilicon.com> > > > --- > > > Documentation/warpdrive/warpdrive.rst | 260 +++++++ > > > Documentation/warpdrive/wd-arch.svg | 764 ++++++++++++++++++++ > > > Documentation/warpdrive/wd.svg | 526 ++++++++++++++ > > > Documentation/warpdrive/wd_q_addr_space.svg | 359 +++++++++ > > > 4 files changed, 1909 insertions(+) > > > create mode 100644 Documentation/warpdrive/warpdrive.rst > > > create mode 100644 Documentation/warpdrive/wd-arch.svg > > > create mode 100644 Documentation/warpdrive/wd.svg > > > create mode 100644 Documentation/warpdrive/wd_q_addr_space.svg > > > > > > diff --git a/Documentation/warpdrive/warpdrive.rst > > > b/Documentation/warpdrive/warpdrive.rst > > > new file mode 100644 > > > index 000000000000..ef84d3a2d462 > > > --- /dev/null > > > +++ b/Documentation/warpdrive/warpdrive.rst > > > @@ -0,0 +1,260 @@ > > > +Introduction of WarpDrive > > > +========================= > > > + > > > +*WarpDrive* is a general accelerator framework for the user application > > > to > > > +access the hardware without going through the kernel in data path. > > > + > > > +It can be used as the quick channel for accelerators, network adaptors or > > > +other hardware for application in user space. > > > + > > > +This may make some implementation simpler. E.g. you can reuse most of > > > the > > > +*netdev* driver in kernel and just share some ring buffer to the user > > > space > > > +driver for *DPDK* [4] or *ODP* [5]. Or you can combine the RSA > > > accelerator with > > > +the *netdev* in the user space as a https reversed proxy, etc. > > > + > > > +*WarpDrive* takes the hardware accelerator as a heterogeneous processor > > > which > > > +can share particular load from the CPU: > > > + > > > +.. image:: wd.svg > > > + :alt: WarpDrive Concept > > > + > > > +The virtual concept, queue, is used to manage the requests sent to the > > > +accelerator. The application send requests to the queue by writing to > > > some > > > +particular address, while the hardware takes the requests directly from > > > the > > > +address and send feedback accordingly. > > > + > > > +The format of the queue may differ from hardware to hardware. But the > > > +application need not to make any system call for the communication. > > > + > > > +*WarpDrive* tries to create a shared virtual address space for all > > > involved > > > +accelerators. Within this space, the requests sent to queue can refer to > > > any > > > +virtual address, which will be valid to the application and all involved > > > +accelerators. > > > + > > > +The name *WarpDrive* is simply a cool and general name meaning the > > > framework > > > +makes the application faster. It includes general user library, kernel > > > +management module and drivers for the hardware. In kernel, the management > > > +module is called *uacce*, meaning "Unified/User-space-access-intended > > > +Accelerator Framework". > > > + > > > + > > > +How does it work > > > +================ > > > + > > > +*WarpDrive* uses *mmap* and *IOMMU* to play the trick. > > > + > > > +*Uacce* creates a chrdev for the device registered to it. A "queue" will > > > be > > > +created when the chrdev is opened. The application access the queue by > > > mmap > > > +different address region of the queue file. > > > + > > > +The following figure demonstrated the queue file address space: > > > + > > > +.. image:: wd_q_addr_space.svg > > > + :alt: WarpDrive Queue Address Space > > > + > > > +The first region of the space, device region, is used for the > > > application to > > > +write request or read answer to or from the hardware. > > > + > > > +Normally, there can be three types of device regions mmio and memory > > > regions. > > > +It is recommended to use common memory for request/answer descriptors > > > and use > > > +the mmio space for device notification, such as doorbell. But of course, > > > this > > > +is all up to the interface designer. > > > + > > > +There can be two types of device memory regions, kernel-only and > > > user-shared. > > > +This will be explained in the "kernel APIs" section. > > > + > > > +The Static Share Virtual Memory region is necessary only when the device > > > IOMMU > > > +does not support "Share Virtual Memory". This will be explained after the > > > +*IOMMU* idea. > > > + > > > + > > > +Architecture > > > +------------ > > > + > > > +The full *WarpDrive* architecture is represented in the following class > > > +diagram: > > > + > > > +.. image:: wd-arch.svg > > > + :alt: WarpDrive Architecture > > > + > > > + > > > +The user API > > > +------------ > > > + > > > +We adopt a polling style interface in the user space: :: > > > + > > > + int wd_request_queue(struct wd_queue *q); > > > + void wd_release_queue(struct wd_queue *q); > > > + > > > + int wd_send(struct wd_queue *q, void *req); > > > + int wd_recv(struct wd_queue *q, void **req); > > > + int wd_recv_sync(struct wd_queue *q, void **req); > > > + void wd_flush(struct wd_queue *q); > > > + > > > +wd_recv_sync() is a wrapper to its non-sync version. It will trapped into > > > +kernel and waits until the queue become available. > > > + > > > +If the queue do not support SVA/SVM. The following helper function > > > +can be used to create Static Virtual Share Memory: :: > > > + > > > + void *wd_preserve_share_memory(struct wd_queue *q, size_t size); > > > + > > > +The user API is not mandatory. It is simply a suggestion and hint what > > > the > > > +kernel interface is supposed to support. > > > + > > > + > > > +The user driver > > > +--------------- > > > + > > > +The queue file mmap space will need a user driver to wrap the > > > communication > > > +protocol. *UACCE* provides some attributes in sysfs for the user driver > > > to > > > +match the right accelerator accordingly. > > > + > > > +The *UACCE* device attribute is under the following directory: > > > + > > > +/sys/class/uacce/<dev-name>/params > > > + > > > +The following attributes is supported: > > > + > > > +nr_queue_remained (ro) > > > + number of queue remained > > > + > > > +api_version (ro) > > > + a string to identify the queue mmap space format and its version > > > + > > > +device_attr (ro) > > > + attributes of the device, see UACCE_DEV_xxx flag defined in > > > uacce.h > > > + > > > +numa_node (ro) > > > + id of numa node > > > + > > > +priority (rw) > > > + Priority or the device, bigger is higher > > > + > > > +(This is not yet implemented in RFC version) > > > + > > > + > > > +The kernel API > > > +-------------- > > > + > > > +The *uacce* kernel API is defined in uacce.h. If the hardware support > > > SVM/SVA, > > > +The driver need only the following API functions: :: > > > + > > > + int uacce_register(uacce); > > > + void uacce_unregister(uacce); > > > + void uacce_wake_up(q); > > > + > > > +*uacce_wake_up* is used to notify the process who epoll() on the queue > > > file. > > > + > > > +According to the IOMMU capability, *uacce* categories the devices as > > > follow: > > > + > > > +UACCE_DEV_NOIOMMU > > > + The device has no IOMMU. The user process cannot use VA on the > > > hardware > > > + This mode is not recommended. > > > + > > > +UACCE_DEV_SVA (UACCE_DEV_PASID | UACCE_DEV_FAULT_FROM_DEV) > > > + The device has IOMMU which can share the same page table with > > > user > > > + process > > > + > > > +UACCE_DEV_SHARE_DOMAIN > > > + The device has IOMMU which has no multiple page table and device > > > page > > > + fault support > > > + > > > +If the device works in mode other than UACCE_DEV_NOIOMMU, *uacce* will > > > set its > > > +IOMMU to IOMMU_DOMAIN_UNMANAGED. So the driver must not use any kernel > > > +DMA API but the following ones from *uacce* instead: :: > > > + > > > + uacce_dma_map(q, va, size, prot); > > > + uacce_dma_unmap(q, va, size, prot); > > > + > > > +*uacce_dma_map/unmap* is valid only for UACCE_DEV_SVA device. It creates > > > a > > > +particular PASID and page table for the kernel in the IOMMU (Not yet > > > +implemented in the RFC) > > > + > > > +For the UACCE_DEV_SHARE_DOMAIN device, uacce_dma_map/unmap is not valid. > > > +*Uacce* call back start_queue only when the DUS and DKO region is > > > mmapped. The > > > +accelerator driver must use those dma buffer, via uacce_queue->qfrs[], on > > > +start_queue call back. The size of the queue file region is defined by > > > +uacce->ops->qf_pg_start[]. > > > + > > > +We have to do it this way because most of current IOMMU cannot support > > > the > > > +kernel and user virtual address at the same time. So we have to let them > > > both > > > +share the same user virtual address space. > > > + > > > +If the device have to support kernel and user at the same time, both > > > kernel > > > +and the user should use these DMA API. This is not convenient. A better > > > +solution is to change the future DMA/IOMMU design to let them separate > > > the > > > +address space between the user and kernel space. But it is not going to > > > be in > > > +a short time. > > > + > > > + > > > +Multiple processes support > > > +========================== > > > + > > > +In the latest mainline kernel (4.19) when this document is written, the > > > IOMMU > > > +subsystem do not support multiple process page tables yet. > > > + > > > +Most IOMMU hardware implementation support multi-process with the concept > > > +of PASID. But they may use different name, e.g. it is call sub-stream-id > > > in > > > +SMMU of ARM. With PASID or similar design, multi page table can be added > > > to > > > +the IOMMU and referred by its PASID. > > > + > > > +*JPB* has a patchset to enable this[1]_. We have tested it with our > > > hardware > > > +(which is known as *D06*). It works well. *WarpDrive* rely on them to > > > support > > > +UACCE_DEV_SVA. If it is not enabled, *WarpDrive* can still work. But it > > > +support only one process, the device will be set to > > > UACCE_DEV_SHARE_DOMAIN > > > +even it is set to UACCE_DEV_SVA initially. > > > + > > > +Static Share Virtual Memory is mainly used by UACCE_DEV_SHARE_DOMAIN > > > device. > > > + > > > + > > > +Legacy Mode Support > > > +=================== > > > +For the hardware without IOMMU, WarpDrive can still work, the only > > > problem is > > > +VA cannot be used in the device. The driver should adopt another > > > strategy for > > > +the shared memory. It is only for testing, and not recommended. > > > + > > > + > > > +The Folk Scenario > > > +================= > > > +For a process with allocated queues and shared memory, what happen if it > > > forks > > > +a child? > > > + > > > +The fd of the queue will be duplicated on folk, so the child can send > > > request > > > +to the same queue as its parent. But the requests which is sent from > > > processes > > > +except for the one who open the queue will be blocked. > > > + > > > +It is recommended to add O_CLOEXEC to the queue file. > > > + > > > +The queue mmap space has a VM_DONTCOPY in its VMA. So the child will > > > lost all > > > +those VMAs. > > > + > > > +This is why *WarpDrive* does not adopt the mode used in *VFIO* and > > > *InfiniBand*. > > > +Both solutions can set any user pointer for hardware sharing. But they > > > cannot > > > +support fork when the dma is in process. Or the "Copy-On-Write" > > > procedure will > > > +make the parent process lost its physical pages. > > > + > > > + > > > +The Sample Code > > > +=============== > > > +There is a sample user land implementation with a simple driver for > > > Hisilicon > > > +Hi1620 ZIP Accelerator. > > > + > > > +To test, do the following in samples/warpdrive (for the case of PC > > > host): :: > > > + ./autogen.sh > > > + ./conf.sh # or simply ./configure if you build on target > > > system > > > + make > > > + > > > +Then you can get test_hisi_zip in the test subdirectory. Copy it to the > > > target > > > +system and make sure the hisi_zip driver is enabled (the major and minor > > > of > > > +the uacce chrdev can be gotten from the dmesg or sysfs), and run: :: > > > + mknod /dev/ua1 c <major> <minior> > > > + test/test_hisi_zip -z < data > data.zip > > > + test/test_hisi_zip -g < data > data.gzip > > > + > > > + > > > +References > > > +========== > > > +.. 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