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Date:	Thu, 10 Jul 2014 22:51:29 +0000
From:	"Gabbay, Oded" <Oded.Gabbay@....com>
To:	"j.glisse@...il.com" <j.glisse@...il.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Bridgman, John" <John.Bridgman@....com>,
	"Deucher, Alexander" <Alexander.Deucher@....com>,
	"Lewycky, Andrew" <Andrew.Lewycky@....com>,
	"joro@...tes.org" <joro@...tes.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"airlied@...ux.ie" <airlied@...ux.ie>,
	"oded.gabbay@...il.com" <oded.gabbay@...il.com>
Subject: Re: [PATCH 00/83] AMD HSA kernel driver

On Thu, 2014-07-10 at 18:24 -0400, Jerome Glisse wrote:
> On Fri, Jul 11, 2014 at 12:45:27AM +0300, Oded Gabbay wrote:
> >  This patch set implements a Heterogeneous System Architecture 
> > (HSA) driver
> >  for radeon-family GPUs.
>  
> This is just quick comments on few things. Given size of this, people
> will need to have time to review things.
>  
> >  HSA allows different processor types (CPUs, DSPs, GPUs, etc..) to 
> > share
> >  system resources more effectively via HW features including 
> > shared pageable
> >  memory, userspace-accessible work queues, and platform-level 
> > atomics. In
> >  addition to the memory protection mechanisms in GPUVM and 
> > IOMMUv2, the Sea
> >  Islands family of GPUs also performs HW-level validation of 
> > commands passed
> >  in through the queues (aka rings).
> >  The code in this patch set is intended to serve both as a sample 
> > driver for
> >  other HSA-compatible hardware devices and as a production driver 
> > for
> >  radeon-family processors. The code is architected to support 
> > multiple CPUs
> >  each with connected GPUs, although the current implementation 
> > focuses on a
> >  single Kaveri/Berlin APU, and works alongside the existing radeon 
> > kernel
> >  graphics driver (kgd).
> >  AMD GPUs designed for use with HSA (Sea Islands and up) share 
> > some hardware
> >  functionality between HSA compute and regular gfx/compute (memory,
> >  interrupts, registers), while other functionality has been added
> >  specifically for HSA compute  (hw scheduler for virtualized 
> > compute rings).
> >  All shared hardware is owned by the radeon graphics driver, and 
> > an interface
> >  between kfd and kgd allows the kfd to make use of those shared 
> > resources,
> >  while HSA-specific functionality is managed directly by kfd by 
> > submitting
> >  packets into an HSA-specific command queue (the "HIQ").
> >  During kfd module initialization a char device node (/dev/kfd) is 
> > created
> >  (surviving until module exit), with ioctls for queue creation & 
> > management,
> >  and data structures are initialized for managing HSA device 
> > topology.
> >  The rest of the initialization is driven by calls from the radeon 
> > kgd at
> >  the following points :
> >  - radeon_init (kfd_init)
> >  - radeon_exit (kfd_fini)
> >  - radeon_driver_load_kms (kfd_device_probe, kfd_device_init)
> >  - radeon_driver_unload_kms (kfd_device_fini)
> >  During the probe and init processing per-device data structures 
> > are
> >  established which connect to the associated graphics kernel 
> > driver. This
> >  information is exposed to userspace via sysfs, along with a 
> > version number
> >  allowing userspace to determine if a topology change has occurred 
> > while it
> >  was reading from sysfs.
> >  The interface between kfd and kgd also allows the kfd to request 
> > buffer
> >  management services from kgd, and allows kgd to route interrupt 
> > requests to
> >  kfd code since the interrupt block is shared between regular
> >  graphics/compute and HSA compute subsystems in the GPU.
> >  The kfd code works with an open source usermode library 
> > ("libhsakmt") which
> >  is in the final stages of IP review and should be published in a 
> > separate
> >  repo over the next few days.
> >  The code operates in one of three modes, selectable via the 
> > sched_policy
> >  module parameter :
> >  - sched_policy=0 uses a hardware scheduler running in the MEC 
> > block within
> >  CP, and allows oversubscription (more queues than HW slots)
> >  - sched_policy=1 also uses HW scheduling but does not allow
> >  oversubscription, so create_queue requests fail when we run out 
> > of HW slots
> >  - sched_policy=2 does not use HW scheduling, so the driver 
> > manually assigns
> >  queues to HW slots by programming registers
> >  The "no HW scheduling" option is for debug & new hardware bringup 
> > only, so
> >  has less test coverage than the other options. Default in the 
> > current code
> >  is "HW scheduling without oversubscription" since that is where 
> > we have the
> >  most test coverage but we expect to change the default to "HW 
> > scheduling
> >  with oversubscription" after further testing. This effectively 
> > removes the
> >  HW limit on the number of work queues available to applications.
> >  Programs running on the GPU are associated with an address space 
> > through the
> >  VMID field, which is translated to a unique PASID at access time 
> > via a set
> >  of 16 VMID-to-PASID mapping registers. The available VMIDs 
> > (currently 16)
> >  are partitioned (under control of the radeon kgd) between current
> >  gfx/compute and HSA compute, with each getting 8 in the current 
> > code. The
> >  VMID-to-PASID mapping registers are updated by the HW scheduler 
> > when used,
> >  and by driver code if HW scheduling is not being used.
> >  The Sea Islands compute queues use a new "doorbell" mechanism 
> > instead of the
> >  earlier kernel-managed write pointer registers. Doorbells use a 
> > separate BAR
> >  dedicated for this purpose, and pages within the doorbell 
> > aperture are
> >  mapped to userspace (each page mapped to only one user address 
> > space).
> >  Writes to the doorbell aperture are intercepted by GPU hardware, 
> > allowing
> >  userspace code to safely manage work queues (rings) without 
> > requiring a
> >  kernel call for every ring update.
> >  First step for an application process is to open the kfd device. 
> > Calls to
> >  open create a kfd "process" structure only for the first thread 
> > of the
> >  process. Subsequent open calls are checked to see if they are 
> > from processes
> >  using the same mm_struct and, if so, don't do anything. The kfd 
> > per-process
> >  data lives as long as the mm_struct exists. Each mm_struct is 
> > associated
> >  with a unique PASID, allowing the IOMMUv2 to make userspace 
> > process memory
> >  accessible to the GPU.
> >  Next step is for the application to collect topology information 
> > via sysfs.
> >  This gives userspace enough information to be able to identify 
> > specific
> >  nodes (processors) in subsequent queue management calls. 
> > Application
> >  processes can create queues on multiple processors, and 
> > processors support
> >  queues from multiple processes.
>  
> I am not a fan to use sysfs to discover topoly.
>  
> >  At this point the application can create work queues in userspace 
> > memory and
> >  pass them through the usermode library to kfd to have them mapped 
> > onto HW
> >  queue slots so that commands written to the queues can be 
> > executed by the
> >  GPU. Queue operations specify a processor node, and so the bulk 
> > of this code
> >  is device-specific.
> >  Written by John Bridgman <John.Bridgman@....com>
>  
> So general comment is you need to collapse many patches things like 
> 58 fixing
> kernel style should be collapsed ie fix all previous patch that have 
> broken
> style.
>  
> Even worse is thing like 71, removing code you just added few patch 
> earlier
> in the patchset. 
Not quite, the code was added on patch 11.

> This means that if i start reviewing following 
> patch order
> i might spend time on code that is later deleted/modified/fixed ie 
> time i
> spend understanding and reading some code might be just wasted.
Quick answer is that you are of course right, but having said that, I 
think it would be not simple at all to do that squashing.
I squashed what I could, and probably I can do a little more (like 
58), but the major problem is that one of the main modules of the 
driver - the scheduler (QCM) - was completely re-written (patches 
46-53). Therefore, from patch 1 to 53, we use the old scheduler code 
and from 54 we use the new QCM (and the old scheduler code was 
completely remove at 71). So I could maybe squash 71 into 54, but that 
won't help you much, I think.

So, the current advice I can give is to completely ignore the 
following files because they do not exist in the final commit:
- kfd_sched_cik_static.c (stopped using in 54)
- kfd_registers.c (stopped using in 81 because we moved all register 
writes to radeon)
- kfd_hw_pointer_store.c (alive from 46 to 67)
- kfd_hw_pointer_store.h (alive from 46 to 67)

        Oded 
> I will come back with individual patch comments and also general 
> remarks.
>  
> Cheers,
> Jérôme
>  
>  
> >  Alexey Skidanov (4):
> >    hsa/radeon: 32-bit processes support
> >    hsa/radeon: NULL pointer dereference bug workaround
> >    hsa/radeon: HSA64/HSA32 modes support
> >    hsa/radeon: Add local memory to topology
> >  Andrew Lewycky (3):
> >    hsa/radeon: Make binding of process to device permanent
> >    hsa/radeon: Implement hsaKmtSetMemoryPolicy
> >    mm: Change timing of notification to IOMMUs about a page to be
> >      invalidated
> >  Ben Goz (20):
> >    hsa/radeon: Add queue and hw_pointer_store modules
> >    hsa/radeon: Add support allocating kernel doorbells
> >    hsa/radeon: Add mqd_manager module
> >    hsa/radeon: Add kernel queue support for KFD
> >    hsa/radeon: Add module parameter of scheduling policy
> >    hsa/radeon: Add packet manager module
> >    hsa/radeon: Add process queue manager module
> >    hsa/radeon: Add device queue manager module
> >    hsa/radeon: Switch to new queue scheduler
> >    hsa/radeon: Add IOCTL for update queue
> >    hsa/radeon: Queue Management integration with Memory Management
> >    hsa/radeon: update queue fault handling
> >    hsa/radeon: fixing a bug to support 32b processes
> >    hsa/radeon: Fix number of pipes per ME
> >    hsa/radeon: Removing hw pointer store module
> >    hsa/radeon: Adding some error messages
> >    hsa/radeon: Fixing minor issues with kernel queues (DIQ)
> >    drm/radeon: Add register access functions to kfd2kgd interface
> >    hsa/radeon: Eliminating all direct register accesses
> >    drm/radeon: Remove lock functions from kfd2kgd interface
> >  Evgeny Pinchuk (9):
> >    hsa/radeon: fix the OEMID assignment in kfd_topology
> >    drm/radeon: extending kfd-kgd interface
> >    hsa/radeon: implementing IOCTL for clock counters
> >    drm/radeon: adding synchronization for GRBM GFX
> >    hsa/radeon: fixing clock counters bug
> >    drm/radeon: Extending kfd interface
> >    hsa/radeon: Adding max clock speeds to topology
> >    hsa/radeon: Alternating the source of max clock
> >    hsa/radeon: Exclusive access for perf. counters
> >  Michael Varga (1):
> >    hsa/radeon: debugging print statements
> >  Oded Gabbay (45):
> >    mm: Add kfd_process pointer to mm_struct
> >    drm/radeon: reduce number of free VMIDs and pipes in KV
> >    drm/radeon: Report doorbell configuration to kfd
> >    drm/radeon: Add radeon <--> kfd interface
> >    drm/radeon: Add kfd-->kgd interface to get virtual ram size
> >    drm/radeon: Add kfd-->kgd interfaces of memory 
> > allocation/mapping
> >    drm/radeon: Add kfd-->kgd interface of locking srbm_gfx_cntl 
> > register
> >    drm/radeon: Add calls to initialize and finalize kfd from radeon
> >    hsa/radeon: Add code base of hsa driver for AMD's GPUs
> >    hsa/radeon: Add initialization and unmapping of doorbell 
> > aperture
> >    hsa/radeon: Add scheduler code
> >    hsa/radeon: Add kfd mmap handler
> >    hsa/radeon: Add 2 new IOCTL to kfd, CREATE_QUEUE and 
> > DESTROY_QUEUE
> >    hsa/radeon: Update MAINTAINERS and CREDITS files
> >    hsa/radeon: Add interrupt handling module
> >    hsa/radeon: Add the isr function of the KFD scehduler
> >    hsa/radeon: Handle deactivation of queues using interrupts
> >    hsa/radeon: Enable interrupts in KFD scheduler
> >    hsa/radeon: Enable/Disable KFD interrupt module
> >    hsa/radeon: Add interrupt callback function to kgd2kfd interface
> >    hsa/radeon: Add kgd-->kfd interfaces for suspend and resume
> >    drm/radeon: Add calls to suspend and resume of kfd driver
> >    drm/radeon/cik: Don't touch int of pipes 1-7
> >    drm/radeon/cik: Call kfd isr function
> >    hsa/radeon: Fix memory size allocated for HPD
> >    hsa/radeon: Fix list of supported devices
> >    hsa/radeon: Fix coding style in cik_int.h
> >    hsa/radeon: Print ioctl commnad only in debug mode
> >    hsa/radeon: Print ISR info only in debug mode
> >    hsa/radeon: Workaround for a bug in amd_iommu
> >    hsa/radeon: Eliminate warnings in compilation
> >    hsa/radeon: Various kernel styling fixes
> >    hsa/radeon: Rearrange structures in kfd_ioctl.h
> >    hsa/radeon: change another pr_info to pr_debug
> >    hsa/radeon: Fix timeout calculation in sync_with_hw
> >    hsa/radeon: Update module information and version
> >    hsa/radeon: Update module version to 0.6.0
> >    hsa/radeon: Fix initialization of sh_mem registers
> >    hsa/radeon: Fix compilation warnings
> >    hsa/radeon: Remove old scheduler code
> >    hsa/radeon: Static analysis (smatch) fixes
> >    hsa/radeon: Check oversubscription before destroying runlist
> >    hsa/radeon: Don't verify cksum when parsing CRAT table
> >    hsa/radeon: Update module version to 0.6.1
> >    hsa/radeon: Update module version to 0.6.2
> >  Yair Shachar (1):
> >    hsa/radeon: Adding qcm fence return status
> >   CREDITS                                            |    7 +
> >   MAINTAINERS                                        |    8 +
> >   drivers/Kconfig                                    |    2 +
> >   drivers/gpu/Makefile                               |    1 +
> >   drivers/gpu/drm/radeon/Makefile                    |    1 +
> >   drivers/gpu/drm/radeon/cik.c                       |  156 +--
> >   drivers/gpu/drm/radeon/cikd.h                      |   51 +-
> >   drivers/gpu/drm/radeon/radeon.h                    |    9 +
> >   drivers/gpu/drm/radeon/radeon_device.c             |   32 +
> >   drivers/gpu/drm/radeon/radeon_drv.c                |    6 +
> >   drivers/gpu/drm/radeon/radeon_kfd.c                |  630 
> > ++++++++++
> >   drivers/gpu/drm/radeon/radeon_kms.c                |    9 +
> >   drivers/gpu/hsa/Kconfig                            |   20 +
> >   drivers/gpu/hsa/Makefile                           |    1 +
> >   drivers/gpu/hsa/radeon/Makefile                    |   12 +
> >   drivers/gpu/hsa/radeon/cik_int.h                   |   50 +
> >   drivers/gpu/hsa/radeon/cik_mqds.h                  |  250 ++++
> >   drivers/gpu/hsa/radeon/cik_regs.h                  |  220 ++++
> >   drivers/gpu/hsa/radeon/kfd_aperture.c              |  123 ++
> >   drivers/gpu/hsa/radeon/kfd_chardev.c               |  530 
> > +++++++++
> >   drivers/gpu/hsa/radeon/kfd_crat.h                  |  294 +++++
> >   drivers/gpu/hsa/radeon/kfd_device.c                |  244 ++++
> >   drivers/gpu/hsa/radeon/kfd_device_queue_manager.c  |  981 
> > ++++++++++++++++
> >   drivers/gpu/hsa/radeon/kfd_device_queue_manager.h  |  101 ++
> >   drivers/gpu/hsa/radeon/kfd_doorbell.c              |  242 ++++
> >   drivers/gpu/hsa/radeon/kfd_interrupt.c             |  177 +++
> >   drivers/gpu/hsa/radeon/kfd_kernel_queue.c          |  305 +++++
> >   drivers/gpu/hsa/radeon/kfd_kernel_queue.h          |   66 ++
> >   drivers/gpu/hsa/radeon/kfd_module.c                |  130 +++
> >   drivers/gpu/hsa/radeon/kfd_mqd_manager.c           |  290 +++++
> >   drivers/gpu/hsa/radeon/kfd_mqd_manager.h           |   54 +
> >   drivers/gpu/hsa/radeon/kfd_packet_manager.c        |  488 
> > ++++++++
> >   drivers/gpu/hsa/radeon/kfd_pasid.c                 |   97 ++
> >   drivers/gpu/hsa/radeon/kfd_pm4_headers.h           |  682 
> > +++++++++++
> >   drivers/gpu/hsa/radeon/kfd_pm4_opcodes.h           |  107 ++
> >   drivers/gpu/hsa/radeon/kfd_priv.h                  |  475 
> > ++++++++
> >   drivers/gpu/hsa/radeon/kfd_process.c               |  391 +++++++
> >   drivers/gpu/hsa/radeon/kfd_process_queue_manager.c |  343 ++++++
> >   drivers/gpu/hsa/radeon/kfd_queue.c                 |  109 ++
> >   drivers/gpu/hsa/radeon/kfd_scheduler.h             |   72 ++
> >   drivers/gpu/hsa/radeon/kfd_topology.c              | 1207 
> > ++++++++++++++++++++
> >   drivers/gpu/hsa/radeon/kfd_topology.h              |  168 +++
> >   drivers/gpu/hsa/radeon/kfd_vidmem.c                |   97 ++
> >   include/linux/mm_types.h                           |   14 +
> >   include/linux/radeon_kfd.h                         |  106 ++
> >   include/uapi/linux/kfd_ioctl.h                     |  133 +++
> >   mm/rmap.c                                          |    8 +-
> >   47 files changed, 9402 insertions(+), 97 deletions(-)
> >   create mode 100644 drivers/gpu/drm/radeon/radeon_kfd.c
> >   create mode 100644 drivers/gpu/hsa/Kconfig
> >   create mode 100644 drivers/gpu/hsa/Makefile
> >   create mode 100644 drivers/gpu/hsa/radeon/Makefile
> >   create mode 100644 drivers/gpu/hsa/radeon/cik_int.h
> >   create mode 100644 drivers/gpu/hsa/radeon/cik_mqds.h
> >   create mode 100644 drivers/gpu/hsa/radeon/cik_regs.h
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_aperture.c
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_chardev.c
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_crat.h
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_device.c
> >   create mode 100644 
> > drivers/gpu/hsa/radeon/kfd_device_queue_manager.c
> >   create mode 100644 
> > drivers/gpu/hsa/radeon/kfd_device_queue_manager.h
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_doorbell.c
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_interrupt.c
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_kernel_queue.c
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_kernel_queue.h
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_module.c
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_mqd_manager.c
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_mqd_manager.h
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_packet_manager.c
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_pasid.c
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_pm4_headers.h
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_pm4_opcodes.h
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_priv.h
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_process.c
> >   create mode 100644 
> > drivers/gpu/hsa/radeon/kfd_process_queue_manager.c
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_queue.c
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_scheduler.h
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_topology.c
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_topology.h
> >   create mode 100644 drivers/gpu/hsa/radeon/kfd_vidmem.c
> >   create mode 100644 include/linux/radeon_kfd.h
> >   create mode 100644 include/uapi/linux/kfd_ioctl.h
> >  --
> >  1.9.1

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