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The rough consensus is that no helper or extra scaffolding is needed around long-running jobs and no further changes to drm-scheduler. At least for now. Other drivers that currently do long-running workloads have no plat to use drm-scheduler. Besides, the current consensus is that this solution of simply returning NULL to the run_job function should work without extra code duplication or complication. On top of that, this item was already a non-blocking one for upstreaming Xe, so let's move that to the 'Completed' section and revisit the long-running solution as a community after Xe is integrated in DRM. Signed-off-by: Matthew Brost Signed-off-by: Rodrigo Vivi --- Documentation/gpu/rfc/xe.rst | 27 ++++++++++++--------------- 1 file changed, 12 insertions(+), 15 deletions(-) diff --git a/Documentation/gpu/rfc/xe.rst b/Documentation/gpu/rfc/xe.rst index ceb21219d52e..2a5132327617 100644 --- a/Documentation/gpu/rfc/xe.rst +++ b/Documentation/gpu/rfc/xe.rst @@ -132,21 +132,6 @@ the time comes. The DRM GPUVM helpers do not yet include the userptr parts, but discussions about implementing them are ongoing. -Long running compute: minimal data structure/scaffolding --------------------------------------------------------- -The generic scheduler code needs to include the handling of endless compute -contexts, with the minimal scaffolding for preempt-ctx fences (probably on the -drm_sched_entity) and making sure drm_scheduler can cope with the lack of job -completion fence. - -The goal is to achieve a consensus ahead of Xe initial pull-request, ideally with -this minimal drm/scheduler work, if needed, merged to drm-misc in a way that any -drm driver, including Xe, could re-use and add their own individual needs on top -in a next stage. However, this should not block the initial merge. - -This is a non-blocker item since the driver without the support for the long -running compute enabled is not a showstopper. - Display integration with i915 ----------------------------- In order to share the display code with the i915 driver so that there is maximum @@ -184,6 +169,18 @@ Xe – uAPI high level overview Xe – Pre-Merge Goals - Completed ================================ +Long running compute: minimal data structure/scaffolding +-------------------------------------------------------- +The generic scheduler code needs to include the handling of endless compute +contexts, with the minimal scaffolding for preempt-ctx fences (probably on the +drm_sched_entity) and making sure drm_scheduler can cope with the lack of job +completion fence. + +The goal is to achieve a consensus ahead of Xe initial pull-request, ideally with +this minimal drm/scheduler work, if needed, merged to drm-misc in a way that any +drm driver, including Xe, could re-use and add their own individual needs on top +in a next stage. 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This completed this goal with the consensus of how the drm/scheduler fits to the fw scheduling and the relationship between drm_gpu_scheduler and drm_sched_entity. Signed-off-by: Rodrigo Vivi --- Documentation/gpu/rfc/xe.rst | 36 ++++++++++++++++++------------------ 1 file changed, 18 insertions(+), 18 deletions(-) diff --git a/Documentation/gpu/rfc/xe.rst b/Documentation/gpu/rfc/xe.rst index 2a5132327617..9f3afab6c06a 100644 --- a/Documentation/gpu/rfc/xe.rst +++ b/Documentation/gpu/rfc/xe.rst @@ -70,24 +70,6 @@ When the time comes for Xe, the protection will be lifted on Xe and kept in i915 Xe – Pre-Merge Goals - Work-in-Progress ======================================= -Drm_scheduler -------------- -Xe primarily uses Firmware based scheduling (GuC FW). However, it will use -drm_scheduler as the scheduler ‘frontend’ for userspace submission in order to -resolve syncobj and dma-buf implicit sync dependencies. However, drm_scheduler is -not yet prepared to handle the 1-to-1 relationship between drm_gpu_scheduler and -drm_sched_entity. - -Deeper changes to drm_scheduler should *not* be required to get Xe accepted, but -some consensus needs to be reached between Xe and other community drivers that -could also benefit from this work, for coupling FW based/assisted submission such -as the ARM’s new Mali GPU driver, and others. - -As a key measurable result, the patch series introducing Xe itself shall not -depend on any other patch touching drm_scheduler itself that was not yet merged -through drm-misc. This, by itself, already includes the reach of an agreement for -uniform 1 to 1 relationship implementation / usage across drivers. - ASYNC VM_BIND ------------- Although having a common DRM level IOCTL for VM_BIND is not a requirement to get @@ -169,6 +151,24 @@ Xe – uAPI high level overview Xe – Pre-Merge Goals - Completed ================================ +Drm_scheduler +------------- +Xe primarily uses Firmware based scheduling (GuC FW). However, it will use +drm_scheduler as the scheduler ‘frontend’ for userspace submission in order to +resolve syncobj and dma-buf implicit sync dependencies. However, drm_scheduler is +not yet prepared to handle the 1-to-1 relationship between drm_gpu_scheduler and +drm_sched_entity. + +Deeper changes to drm_scheduler should *not* be required to get Xe accepted, but +some consensus needs to be reached between Xe and other community drivers that +could also benefit from this work, for coupling FW based/assisted submission such +as the ARM’s new Mali GPU driver, and others. + +As a key measurable result, the patch series introducing Xe itself shall not +depend on any other patch touching drm_scheduler itself that was not yet merged +through drm-misc. This, by itself, already includes the reach of an agreement for +uniform 1 to 1 relationship implementation / usage across drivers. + Long running compute: minimal data structure/scaffolding -------------------------------------------------------- The generic scheduler code needs to include the handling of endless compute From patchwork Fri Dec 1 04:21:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Rodrigo Vivi X-Patchwork-Id: 13475338 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EC3F5C4167B for ; Fri, 1 Dec 2023 04:23:52 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C672110E7AE; 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Let's move and clean up the WIP block. Signed-off-by: Rodrigo Vivi --- Documentation/gpu/rfc/xe.rst | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-) diff --git a/Documentation/gpu/rfc/xe.rst b/Documentation/gpu/rfc/xe.rst index 9f3afab6c06a..87dd620aea59 100644 --- a/Documentation/gpu/rfc/xe.rst +++ b/Documentation/gpu/rfc/xe.rst @@ -70,18 +70,6 @@ When the time comes for Xe, the protection will be lifted on Xe and kept in i915 Xe – Pre-Merge Goals - Work-in-Progress ======================================= -ASYNC VM_BIND -------------- -Although having a common DRM level IOCTL for VM_BIND is not a requirement to get -Xe merged, it is mandatory to have a consensus with other drivers and Mesa. -It needs to be clear how to handle async VM_BIND and interactions with userspace -memory fences. Ideally with helper support so people don't get it wrong in all -possible ways. - -As a key measurable result, the benefits of ASYNC VM_BIND and a discussion of -various flavors, error handling and sample API suggestions are documented in -:doc:`The ASYNC VM_BIND document `. - Userptr integration and vm_bind ------------------------------- Different drivers implement different ways of dealing with execution of userptr. @@ -151,6 +139,18 @@ Xe – uAPI high level overview Xe – Pre-Merge Goals - Completed ================================ +ASYNC VM_BIND +------------- +Although having a common DRM level IOCTL for VM_BIND is not a requirement to get +Xe merged, it is mandatory to have a consensus with other drivers and Mesa. +It needs to be clear how to handle async VM_BIND and interactions with userspace +memory fences. Ideally with helper support so people don't get it wrong in all +possible ways. + +As a key measurable result, the benefits of ASYNC VM_BIND and a discussion of +various flavors, error handling and sample API suggestions are documented in +:doc:`The ASYNC VM_BIND document `. + Drm_scheduler ------------- Xe primarily uses Firmware based scheduling (GuC FW). 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The other extra discussion around GPUVM helpers are currently active in the community. None of those discussion should block Xe since documentation, specially around locking was completed in a community consensus. Signed-off-by: Rodrigo Vivi --- Documentation/gpu/rfc/xe.rst | 64 ++++++++++++++++++------------------ 1 file changed, 32 insertions(+), 32 deletions(-) diff --git a/Documentation/gpu/rfc/xe.rst b/Documentation/gpu/rfc/xe.rst index 87dd620aea59..cfff8a59a876 100644 --- a/Documentation/gpu/rfc/xe.rst +++ b/Documentation/gpu/rfc/xe.rst @@ -70,38 +70,6 @@ When the time comes for Xe, the protection will be lifted on Xe and kept in i915 Xe – Pre-Merge Goals - Work-in-Progress ======================================= -Userptr integration and vm_bind -------------------------------- -Different drivers implement different ways of dealing with execution of userptr. -With multiple drivers currently introducing support to VM_BIND, the goal is to -aim for a DRM consensus on what’s the best way to have that support. To some -extent this is already getting addressed itself with the GPUVA where likely the -userptr will be a GPUVA with a NULL GEM call VM bind directly on the userptr. -However, there are more aspects around the rules for that and the usage of -mmu_notifiers, locking and other aspects. - -This task here has the goal of introducing a documentation of the basic rules. - -The documentation *needs* to first live in this document (API session below) and -then moved to another more specific document or at Xe level or at DRM level. - -Documentation should include: - - * The userptr part of the VM_BIND api. - - * Locking, including the page-faulting case. - - * O(1) complexity under VM_BIND. - -The document is now included in the drm documentation :doc:`here `. - -Some parts of userptr like mmu_notifiers should become GPUVA or DRM helpers when -the second driver supporting VM_BIND+userptr appears. Details to be defined when -the time comes. - -The DRM GPUVM helpers do not yet include the userptr parts, but discussions -about implementing them are ongoing. - Display integration with i915 ----------------------------- In order to share the display code with the i915 driver so that there is maximum @@ -139,6 +107,38 @@ Xe – uAPI high level overview Xe – Pre-Merge Goals - Completed ================================ +Userptr integration and vm_bind +------------------------------- +Different drivers implement different ways of dealing with execution of userptr. +With multiple drivers currently introducing support to VM_BIND, the goal is to +aim for a DRM consensus on what’s the best way to have that support. To some +extent this is already getting addressed itself with the GPUVA where likely the +userptr will be a GPUVA with a NULL GEM call VM bind directly on the userptr. +However, there are more aspects around the rules for that and the usage of +mmu_notifiers, locking and other aspects. + +This task here has the goal of introducing a documentation of the basic rules. + +The documentation *needs* to first live in this document (API session below) and +then moved to another more specific document or at Xe level or at DRM level. + +Documentation should include: + + * The userptr part of the VM_BIND api. + + * Locking, including the page-faulting case. + + * O(1) complexity under VM_BIND. + +The document is now included in the drm documentation :doc:`here `. + +Some parts of userptr like mmu_notifiers should become GPUVA or DRM helpers when +the second driver supporting VM_BIND+userptr appears. Details to be defined when +the time comes. + +The DRM GPUVM helpers do not yet include the userptr parts, but discussions +about implementing them are ongoing. + ASYNC VM_BIND ------------- Although having a common DRM level IOCTL for VM_BIND is not a requirement to get From patchwork Fri Dec 1 04:21:55 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Rodrigo Vivi X-Patchwork-Id: 13475342 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E1172C07E97 for ; Fri, 1 Dec 2023 04:26:08 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 1E1ED10E7BF; Fri, 1 Dec 2023 04:25:55 +0000 (UTC) Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.9]) by gabe.freedesktop.org (Postfix) with ESMTPS id D9EE210E7B6; 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Signed-off-by: Rodrigo Vivi --- Documentation/gpu/rfc/xe.rst | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/Documentation/gpu/rfc/xe.rst b/Documentation/gpu/rfc/xe.rst index cfff8a59a876..97cf87578f97 100644 --- a/Documentation/gpu/rfc/xe.rst +++ b/Documentation/gpu/rfc/xe.rst @@ -85,6 +85,14 @@ from the first pull request of Xe towards drm-next. The expectation is that when both drivers are part of the drm-tip, the introduction of cleaner patches will be easier and speed up. +Xe – uAPI high level overview +============================= + +...Warning: To be done in follow up patches after/when/where the main consensus in various items are individually reached. + +Xe – Pre-Merge Goals - Completed +================================ + Drm_exec -------- Helper to make dma_resv locking for a big number of buffers is getting removed in @@ -99,14 +107,6 @@ This item ties into the GPUVA, VM_BIND, and even long-running compute support. As a key measurable result, we need to have a community consensus documented in this document and the Xe driver prepared for the changes, if necessary. -Xe – uAPI high level overview -============================= - -...Warning: To be done in follow up patches after/when/where the main consensus in various items are individually reached. - -Xe – Pre-Merge Goals - Completed -================================ - Userptr integration and vm_bind ------------------------------- Different drivers implement different ways of dealing with execution of userptr.