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From: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
To: Matthew Brost <matthew.brost@intel.com>
Cc: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	daniel.vetter@ffwll.ch, tony.ye@intel.com, zhengguo.xu@intel.com
Subject: Re: [Intel-gfx] [PATCH 23/27] drm/i915/guc: Implement no mid batch preemption for multi-lrc
Date: Mon, 13 Sep 2021 11:52:22 +0100	[thread overview]
Message-ID: <722dd221-3867-2e27-ec48-323e8c36ae43@linux.intel.com> (raw)
In-Reply-To: <20210910204935.GA24315@jons-linux-dev-box>


On 10/09/2021 21:49, Matthew Brost wrote:
> On Fri, Sep 10, 2021 at 12:25:43PM +0100, Tvrtko Ursulin wrote:
>>
>> On 20/08/2021 23:44, Matthew Brost wrote:
>>> For some users of multi-lrc, e.g. split frame, it isn't safe to preempt
>>> mid BB. To safely enable preemption at the BB boundary, a handshake
>>> between to parent and child is needed. This is implemented via custom
>>> emit_bb_start & emit_fini_breadcrumb functions and enabled via by
>>> default if a context is configured by set parallel extension.
>>
>> FWIW I think it's wrong to hardcode the requirements of a particular
>> hardware generation fixed media pipeline into the uapi. IMO better solution
>> was when concept of parallel submission was decoupled from the no preemption
>> mid batch preambles. Otherwise might as well call the extension
>> I915_CONTEXT_ENGINES_EXT_MEDIA_SPLIT_FRAME_SUBMIT or something.
>>
> 
> I don't disagree but this where we landed per Daniel Vetter's feedback -
> default to what our current hardware supports and extend it later to
> newer hardware / requirements as needed.

I think this only re-affirms my argument - no point giving the extension 
a generic name if it is so tightly coupled to a specific use case. But I 
wrote FWIW so whatever.

It will be mighty awkward if compute multi-lrc will need to specify a 
flag to allow preemption, when turning off preemption is otherwise not 
something we allow unprivileged clients to do. So it will be kind of 
opt-out from unfriendly/dangerous default behaviour instead of explicit 
requesting it.

Regards,

Tvrtko

  reply	other threads:[~2021-09-13 10:52 UTC|newest]

Thread overview: 106+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-20 22:44 [PATCH 00/27] Parallel submission aka multi-bb execbuf Matthew Brost
2021-08-20 22:44 ` [PATCH 01/27] drm/i915/guc: Squash Clean up GuC CI failures, simplify locking, and kernel DOC Matthew Brost
2021-08-20 22:44 ` [PATCH 02/27] drm/i915/guc: Allow flexible number of context ids Matthew Brost
2021-09-09 22:13   ` [Intel-gfx] " John Harrison
2021-09-10  0:14     ` Matthew Brost
2021-08-20 22:44 ` [PATCH 03/27] drm/i915/guc: Connect the number of guc_ids to debugfs Matthew Brost
2021-09-09 22:16   ` [Intel-gfx] " John Harrison
2021-09-10  0:16     ` Matthew Brost
2021-08-20 22:44 ` [PATCH 04/27] drm/i915/guc: Take GT PM ref when deregistering context Matthew Brost
2021-09-09 22:28   ` [Intel-gfx] " John Harrison
2021-09-10  0:21     ` Matthew Brost
2021-09-13  9:55   ` Tvrtko Ursulin
2021-09-13 17:12     ` Matthew Brost
2021-09-14  8:41       ` Tvrtko Ursulin
2021-08-20 22:44 ` [PATCH 05/27] drm/i915: Add GT PM unpark worker Matthew Brost
2021-09-09 22:36   ` [Intel-gfx] " John Harrison
2021-09-10  0:34     ` Matthew Brost
2021-09-10  8:36   ` Tvrtko Ursulin
2021-09-10 20:09     ` Matthew Brost
2021-09-13 10:33       ` Tvrtko Ursulin
2021-09-13 17:20         ` Matthew Brost
2021-08-20 22:44 ` [PATCH 06/27] drm/i915/guc: Take engine PM when a context is pinned with GuC submission Matthew Brost
2021-09-09 22:46   ` [Intel-gfx] " John Harrison
2021-09-10  0:41     ` Matthew Brost
2021-09-13 22:26       ` John Harrison
2021-09-14  1:12         ` Matthew Brost
2021-08-20 22:44 ` [PATCH 07/27] drm/i915/guc: Don't call switch_to_kernel_context " Matthew Brost
2021-09-09 22:51   ` [Intel-gfx] " John Harrison
2021-09-13 16:54     ` Matthew Brost
2021-09-13 22:38       ` John Harrison
2021-09-14  5:02         ` Matthew Brost
2021-09-13 16:55     ` Matthew Brost
2021-08-20 22:44 ` [PATCH 08/27] drm/i915: Add logical engine mapping Matthew Brost
2021-09-10 11:12   ` [Intel-gfx] " Tvrtko Ursulin
2021-09-10 19:49     ` Matthew Brost
2021-09-13  9:24       ` Tvrtko Ursulin
2021-09-13 16:50         ` Matthew Brost
2021-09-14  8:34           ` Tvrtko Ursulin
2021-09-14 18:04             ` Matthew Brost
2021-09-15  8:24               ` Tvrtko Ursulin
2021-09-15 16:58                 ` Matthew Brost
2021-09-16  8:31                   ` Tvrtko Ursulin
2021-08-20 22:44 ` [PATCH 09/27] drm/i915: Expose logical engine instance to user Matthew Brost
2021-09-13 23:06   ` [Intel-gfx] " John Harrison
2021-09-14  1:08     ` Matthew Brost
2021-08-20 22:44 ` [PATCH 10/27] drm/i915/guc: Introduce context parent-child relationship Matthew Brost
2021-09-13 23:19   ` [Intel-gfx] " John Harrison
2021-09-14  1:18     ` Matthew Brost
2021-08-20 22:44 ` [PATCH 11/27] drm/i915/guc: Implement parallel context pin / unpin functions Matthew Brost
2021-08-20 22:44 ` [PATCH 12/27] drm/i915/guc: Add multi-lrc context registration Matthew Brost
2021-09-15 19:21   ` [Intel-gfx] " John Harrison
2021-09-15 19:31     ` Matthew Brost
2021-09-15 20:23       ` John Harrison
2021-09-15 20:33         ` Matthew Brost
2021-08-20 22:44 ` [PATCH 13/27] drm/i915/guc: Ensure GuC schedule operations do not operate on child contexts Matthew Brost
2021-09-15 19:24   ` [Intel-gfx] " John Harrison
2021-09-15 19:34     ` Matthew Brost
2021-08-20 22:44 ` [PATCH 14/27] drm/i915/guc: Assign contexts in parent-child relationship consecutive guc_ids Matthew Brost
2021-09-15 20:04   ` [Intel-gfx] " John Harrison
2021-09-15 20:55     ` Matthew Brost
2021-08-20 22:44 ` [PATCH 15/27] drm/i915/guc: Implement multi-lrc submission Matthew Brost
2021-08-21 14:04   ` kernel test robot
2021-08-22  2:18   ` kernel test robot
2021-09-20 21:48   ` [Intel-gfx] " John Harrison
2021-09-22 16:25     ` Matthew Brost
2021-09-22 20:15       ` John Harrison
2021-09-23  2:44         ` Matthew Brost
2021-08-20 22:44 ` [PATCH 16/27] drm/i915/guc: Insert submit fences between requests in parent-child relationship Matthew Brost
2021-09-20 21:57   ` [Intel-gfx] " John Harrison
2021-08-20 22:44 ` [PATCH 17/27] drm/i915/guc: Implement multi-lrc reset Matthew Brost
2021-09-20 22:44   ` [Intel-gfx] " John Harrison
2021-09-22 16:16     ` Matthew Brost
2021-08-20 22:44 ` [PATCH 18/27] drm/i915/guc: Update debugfs for GuC multi-lrc Matthew Brost
2021-09-20 22:48   ` [Intel-gfx] " John Harrison
2021-09-21 19:13     ` Matthew Brost
2021-08-20 22:44 ` [PATCH 19/27] drm/i915: Fix bug in user proto-context creation that leaked contexts Matthew Brost
2021-09-20 22:57   ` [Intel-gfx] " John Harrison
2021-09-21 14:49     ` Tvrtko Ursulin
2021-09-21 19:28       ` Matthew Brost
2021-09-21 19:28     ` Matthew Brost
2021-08-20 22:44 ` [PATCH 20/27] drm/i915/guc: Connect UAPI to GuC multi-lrc interface Matthew Brost
2021-08-29  4:00   ` [Intel-gfx] " kernel test robot
2021-08-29 19:59   ` kernel test robot
2021-09-21  0:09   ` John Harrison
2021-09-22 16:38     ` Matthew Brost
2021-08-20 22:44 ` [PATCH 21/27] drm/i915/doc: Update parallel submit doc to point to i915_drm.h Matthew Brost
2021-09-21  0:12   ` [Intel-gfx] " John Harrison
2021-08-20 22:44 ` [PATCH 22/27] drm/i915/guc: Add basic GuC multi-lrc selftest Matthew Brost
2021-09-28 20:47   ` [Intel-gfx] " John Harrison
2021-08-20 22:44 ` [PATCH 23/27] drm/i915/guc: Implement no mid batch preemption for multi-lrc Matthew Brost
2021-09-10 11:25   ` [Intel-gfx] " Tvrtko Ursulin
2021-09-10 20:49     ` Matthew Brost
2021-09-13 10:52       ` Tvrtko Ursulin [this message]
2021-09-28 22:20   ` John Harrison
2021-09-28 22:33     ` Matthew Brost
2021-09-28 23:33       ` John Harrison
2021-09-29  0:22         ` Matthew Brost
2021-08-20 22:44 ` [PATCH 24/27] drm/i915: Multi-BB execbuf Matthew Brost
2021-08-21 19:01   ` [Intel-gfx] " kernel test robot
2021-08-30  3:46   ` kernel test robot
2021-09-30 22:16   ` Matthew Brost
2021-08-20 22:44 ` [PATCH 25/27] drm/i915/guc: Handle errors in multi-lrc requests Matthew Brost
2021-09-29 20:44   ` [Intel-gfx] " John Harrison
2021-09-29 20:58     ` Matthew Brost
2021-08-20 22:44 ` [PATCH 26/27] drm/i915: Enable multi-bb execbuf Matthew Brost
2021-08-20 22:44 ` [PATCH 27/27] drm/i915/execlists: Weak parallel submission support for execlists Matthew Brost

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