linux-kernel - Re: [PATCH v6 4/5] drm/msm: Refactor address space initialization

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Message-ID: <CADaigPWJDEwPZyUyEO9H3=+zzdEX=h+gSa-w1ppNpM9ryY0LZA@mail.gmail.com>
Date:   Wed, 17 Jun 2020 13:16:06 -0700
From:   Eric Anholt <eric@...olt.net>
To:     Jordan Crouse <jcrouse@...eaurora.org>
Cc:     iommu@...ts.linux-foundation.org, Sam Ravnborg <sam@...nborg.org>,
        Jeffrey Hugo <jeffrey.l.hugo@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Akhil P Oommen <akhilpo@...eaurora.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        AngeloGioacchino Del Regno <kholk11@...il.com>,
        Wen Yang <wen.yang99@....com.cn>, will@...nel.org,
        Ben Dooks <ben.dooks@...ethink.co.uk>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Brian Masney <masneyb@...tation.org>,
        freedreno@...ts.freedesktop.org,
        Thomas Zimmermann <tzimmermann@...e.de>,
        linux-arm-msm@...r.kernel.org,
        Sharat Masetty <smasetty@...eaurora.org>,
        Alexios Zavras <alexios.zavras@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sean Paul <sean@...rly.run>,
        Allison Randal <allison@...utok.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        zhengbin <zhengbin13@...wei.com>,
        tongtiangen <tongtiangen@...wei.com>,
        Drew Davenport <ddavenport@...omium.org>,
        Wambui Karuga <wambui.karugax@...il.com>,
        Robin Murphy <robin.murphy@....com>,
        Georgi Djakov <georgi.djakov@...aro.org>
Subject: Re: [PATCH v6 4/5] drm/msm: Refactor address space initialization

On Thu, Apr 9, 2020 at 4:34 PM Jordan Crouse <jcrouse@...eaurora.org> wrote:
>
> Refactor how address space initialization works. Instead of having the
> address space function create the MMU object (and thus require separate but
> equal functions for gpummu and iommu) use a single function and pass the
> MMU struct in. Make the generic code cleaner by using target specific
> functions to create the address space so a2xx can do its own thing in its
> own space.  For all the other targets use a generic helper to initialize
> IOMMU but leave the door open for newer targets to use customization
> if they need it.

I'm seeing regressions in dEQP-VK.memory.allocation.random.* on cheza
after this commit.   The symptom is that large allocations fail with
-ENOSPC from MSM_GEM_INFO(IOVA).

Possibly relevant change from having stuffed some debug info in:

before:
[    3.791436] [drm:msm_gem_address_space_create] *ERROR* msmgem
address space create: 0x1000000 + 0xfeffffff
[    3.801672] platform 506a000.gmu: Adding to iommu group 6
[    3.807359] [drm:msm_gem_address_space_create] *ERROR* msmgem
address space create: 0x0 + 0x7fffffff
[    3.817140] msm ae00000.mdss: bound 5000000.gpu (ops a3xx_ops)
[    3.823212] msm_dpu ae01000.mdp: [drm:msm_ioremap] *ERROR* failed
to get memory resource: vbif_nrt
[    3.832429] msm_dpu ae01000.mdp: [drm:msm_ioremap] *ERROR* failed
to get memory resource: regdma
[    3.841478] [drm:dpu_kms_hw_init:878] dpu hardware revision:0x40000000
[    3.848193] [drm:msm_gem_address_space_create] *ERROR* msmgem
address space create: 0x1000 + 0xffffefff

after:

[    3.798707] [drm:msm_gem_address_space_create] *ERROR* msmgem
address space create: 0x1000000 + 0xfffffff
[    3.808731] platform 506a000.gmu: Adding to iommu group 6
[    3.814440] [drm:msm_gem_address_space_create] *ERROR* msmgem
address space create: 0x0 + 0x7fffffff
[    3.820494] hub 2-1:1.0: USB hub found
[    3.824108] msm ae00000.mdss: bound 5000000.gpu (ops a3xx_ops)
[    3.828554] hub 2-1:1.0: 4 ports detected
[    3.833756] msm_dpu ae01000.mdp: [drm:msm_ioremap] *ERROR* failed
to get memory resource: vbif_nrt
[    3.847038] msm_dpu ae01000.mdp: [drm:msm_ioremap] *ERROR* failed
to get memory resource: regdma
[    3.856095] [drm:dpu_kms_hw_init:878] dpu hardware revision:0x40000000
[    3.862840] [drm:msm_gem_address_space_create] *ERROR* msmgem
address space create: 0x1000 + 0xfffffff

256MB for GMU address space?