Re: [PATCH v8] drm/lima: driver for ARM Mali4xx GPUs

[Neil Armstrong <narmstrong@baylibre.com>]

Hi,

On 26/03/2019 21:40, Vasily Khoruzhick wrote:
> Hi,
> 
> So what's the status of it?

We are waiting on ARM to give a feedback on the ARM GPU tile modifier,
see https://patchwork.freedesktop.org/patch/292187/?series=57996&rev=1

Neil

> 
> Has it been merged? I don't see it in drm-misc-next.
> 
> Regards,
> Vasily
> 
> On Tue, Mar 12, 2019 at 1:12 AM Heiko Stuebner <heiko@sntech.de> wrote:
>>
>> Hi,
>>
>> Am Dienstag, 12. März 2019, 02:54:57 CET schrieb Qiang Yu:
>>> On Mon, Mar 11, 2019 at 11:37 PM Rob Herring <robh@kernel.org> wrote:
>>>>
>>>> On Sat, Mar 9, 2019 at 6:21 AM Qiang Yu <yuq825@gmail.com> wrote:
>>>>>
>>>>> - Mali 4xx GPUs have two kinds of processors GP and PP. GP is for
>>>>>   OpenGL vertex shader processing and PP is for fragment shader
>>>>>   processing. Each processor has its own MMU so prcessors work in
>>>>>   virtual address space.
>>>>> - There's only one GP but multiple PP (max 4 for mali 400 and 8
>>>>>   for mali 450) in the same mali 4xx GPU. All PPs are grouped
>>>>>   togather to handle a single fragment shader task divided by
>>>>>   FB output tiled pixels. Mali 400 user space driver is
>>>>>   responsible for assign target tiled pixels to each PP, but mali
>>>>>   450 has a HW module called DLBU to dynamically balance each
>>>>>   PP's load.
>>>>> - User space driver allocate buffer object and map into GPU
>>>>>   virtual address space, upload command stream and draw data with
>>>>>   CPU mmap of the buffer object, then submit task to GP/PP with
>>>>>   a register frame indicating where is the command stream and misc
>>>>>   settings.
>>>>> - There's no command stream validation/relocation due to each user
>>>>>   process has its own GPU virtual address space. GP/PP's MMU switch
>>>>>   virtual address space before running two tasks from different
>>>>>   user process. Error or evil user space code just get MMU fault
>>>>>   or GP/PP error IRQ, then the HW/SW will be recovered.
>>>>> - Use GEM+shmem for MM. Currently just alloc and pin memory when
>>>>>   gem object creation. GPU vm map of the buffer is also done in
>>>>>   the alloc stage in kernel space. We may delay the memory
>>>>>   allocation and real GPU vm map to command submission stage in the
>>>>>   furture as improvement.
>>>>> - Use drm_sched for GPU task schedule. Each OpenGL context should
>>>>>   have a lima context object in the kernel to distinguish tasks
>>>>>   from different user. drm_sched gets task from each lima context
>>>>>   in a fair way.
>>>>>
>>>>> mesa driver can be found here before upstreamed:
>>>>> https://gitlab.freedesktop.org/lima/mesa
>>>>>
>>>>> v8:
>>>>> - add comments for in_sync
>>>>> - fix ctx free miss mutex unlock
>>>>>
>>>>> v7:
>>>>> - remove lima_fence_ops with default value
>>>>> - move fence slab create to device probe
>>>>> - check pad ioctl args to be zero
>>>>> - add comments for user/kernel interface
>>>>>
>>>>> v6:
>>>>> - fix comments by checkpatch.pl
>>>>>
>>>>> v5:
>>>>> - export gp/pp version to userspace
>>>>> - rebase on drm-misc-next
>>>>>
>>>>> v4:
>>>>> - use get param interface to get info
>>>>> - separate context create/free ioctl
>>>>> - remove unused max sched task param
>>>>> - update copyright time
>>>>> - use xarray instead of idr
>>>>> - stop using drmP.h
>>>>>
>>>>> v3:
>>>>> - fix comments from kbuild robot
>>>>> - restrict supported arch to tested ones
>>>>>
>>>>> v2:
>>>>> - fix syscall argument check
>>>>> - fix job finish fence leak since kernel 5.0
>>>>> - use drm syncobj to replace native fence
>>>>> - move buffer object GPU va map into kernel
>>>>> - reserve syscall argument space for future info
>>>>> - remove kernel gem modifier
>>>>> - switch TTM back to GEM+shmem MM
>>>>> - use time based io poll
>>>>> - use whole register name
>>>>> - adopt gem reservation obj integration
>>>>> - use drm_timeout_abs_to_jiffies
>>>>>
>>>>> Cc: Eric Anholt <eric@anholt.net>
>>>>> Cc: Rob Herring <robh@kernel.org>
>>>>> Cc: Christian König <ckoenig.leichtzumerken@gmail.com>
>>>>> Cc: Daniel Vetter <daniel@ffwll.ch>
>>>>> Cc: Alex Deucher <alexdeucher@gmail.com>
>>>>> Cc: Sam Ravnborg <sam@ravnborg.org>
>>>>> Cc: Rob Clark <robdclark@gmail.com>
>>>>> Cc: Dave Airlie <airlied@gmail.com>
>>>>> Signed-off-by: Andreas Baierl <ichgeh@imkreisrum.de>
>>>>> Signed-off-by: Erico Nunes <nunes.erico@gmail.com>
>>>>> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
>>>>> Signed-off-by: Marek Vasut <marex@denx.de>
>>>>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
>>>>> Signed-off-by: Simon Shields <simon@lineageos.org>
>>>>> Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
>>>>> Signed-off-by: Qiang Yu <yuq825@gmail.com>
>>>>> Reviewed-by: Eric Anholt <eric@anholt.net>
>>>>> Reviewed-by: Rob Herring <robh@kerrnel.org>
>>>>> ---
>>>>
>>>> [...]
>>>
>>> I thought get your RB last time, should I remove it?
>>
>> I read Rob's comment as "if you need to resent for any other reason
>> then you could modify for that patch, but no need to resend everything
>> just for this", so a RB can probably stay as it is.
>>
>>
>> Heiko
>>
>>>> Not to make you keep shooting for a moving target, Eric just posted a
>>>> patch[1] a few days ago that can replace these 2 functions. Would be
>>>> good to use if you respin, but otherwise can be a follow-on patch.
>>>
>>> Thanks for the remind.
>>>
>>> Regards,
>>> Qiang
>>
>>
>>
>>

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