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Message-ID: <CAF6AEGt5=bcni0K1ysot3-hVj9gWECJ5qP=M-sEDkRrAmEHFGg@mail.gmail.com>
Date: Tue, 25 Jun 2024 11:03:42 -0700
From: Rob Clark <robdclark@...il.com>
To: Akhil P Oommen <quic_akhilpo@...cinc.com>
Cc: Kiarash Hajian <kiarash8112hajian@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Sean Paul <sean@...rly.run>,
Marijn Suijten <marijn.suijten@...ainline.org>, David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>, linux-arm-msm@...r.kernel.org,
dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm/a6xx: request memory region
On Tue, Jun 25, 2024 at 10:59 AM Akhil P Oommen
<quic_akhilpo@...cinc.com> wrote:
>
> On Fri, Jun 21, 2024 at 02:09:58PM -0700, Rob Clark wrote:
> > On Sat, Jun 8, 2024 at 8:44 AM Kiarash Hajian
> > <kiarash8112hajian@...il.com> wrote:
> > >
> > > The driver's memory regions are currently just ioremap()ed, but not
> > > reserved through a request. That's not a bug, but having the request is
> > > a little more robust.
> > >
> > > Implement the region-request through the corresponding managed
> > > devres-function.
> > >
> > > Signed-off-by: Kiarash Hajian <kiarash8112hajian@...il.com>
> > > ---
> > > Changes in v6:
> > > -Fix compile error
> > > -Link to v5: https://lore.kernel.org/all/20240607-memory-v1-1-8664f52fc2a1@gmail.com
> > >
> > > Changes in v5:
> > > - Fix error hanlding problems.
> > > - Link to v4: https://lore.kernel.org/r/20240512-msm-adreno-memory-region-v4-1-3881a64088e6@gmail.com
> > >
> > > Changes in v4:
> > > - Combine v3 commits into a singel commit
> > > - Link to v3: https://lore.kernel.org/r/20240512-msm-adreno-memory-region-v3-0-0a728ad45010@gmail.com
> > >
> > > Changes in v3:
> > > - Remove redundant devm_iounmap calls, relying on devres for automatic resource cleanup.
> > >
> > > Changes in v2:
> > > - update the subject prefix to "drm/msm/a6xx:", to match the majority of other changes to this file.
> > > ---
> > > drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 33 +++++++++++----------------------
> > > 1 file changed, 11 insertions(+), 22 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> > > index 8bea8ef26f77..d26cc6254ef9 100644
> > > --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> > > +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> > > @@ -525,7 +525,7 @@ static void a6xx_gmu_rpmh_init(struct a6xx_gmu *gmu)
> > > bool pdc_in_aop = false;
> > >
> > > if (IS_ERR(pdcptr))
> > > - goto err;
> > > + return;
> > >
> > > if (adreno_is_a650(adreno_gpu) ||
> > > adreno_is_a660_family(adreno_gpu) ||
> > > @@ -541,7 +541,7 @@ static void a6xx_gmu_rpmh_init(struct a6xx_gmu *gmu)
> > > if (!pdc_in_aop) {
> > > seqptr = a6xx_gmu_get_mmio(pdev, "gmu_pdc_seq");
> > > if (IS_ERR(seqptr))
> > > - goto err;
> > > + return;
> > > }
> > >
> > > /* Disable SDE clock gating */
> > > @@ -633,12 +633,6 @@ static void a6xx_gmu_rpmh_init(struct a6xx_gmu *gmu)
> > > wmb();
> > >
> > > a6xx_rpmh_stop(gmu);
> > > -
> > > -err:
> > > - if (!IS_ERR_OR_NULL(pdcptr))
> > > - iounmap(pdcptr);
> > > - if (!IS_ERR_OR_NULL(seqptr))
> > > - iounmap(seqptr);
> > > }
> > >
> > > /*
> > > @@ -1503,7 +1497,7 @@ static void __iomem *a6xx_gmu_get_mmio(struct platform_device *pdev,
> > > return ERR_PTR(-EINVAL);
> > > }
> > >
> > > - ret = ioremap(res->start, resource_size(res));
> > > + ret = devm_ioremap_resource(&pdev->dev, res);
> >
> > So, this doesn't actually work, failing in __request_region_locked(),
> > because the gmu region partially overlaps with the gpucc region (which
> > is busy). I think this is intentional, since gmu is controlling the
> > gpu clocks, etc. In particular REG_A6XX_GPU_CC_GX_GDSCR is in this
> > overlapping region. Maybe Akhil knows more about GMU.
>
> We don't really need to map gpucc region from driver on behalf of gmu.
> Since we don't access any gpucc register from drm-msm driver, we can
> update the range size to correct this. But due to backward compatibility
> requirement with older dt, can we still enable region locking? I prefer
> it if that is possible.
Actually, when I reduced the region size to not overlap with gpucc,
the region is smaller than REG_A6XX_GPU_CC_GX_GDSCR * 4.
So I guess that register is actually part of gpucc?
BR,
-R
> FYI, kgsl accesses gpucc registers to ensure gdsc has collapsed. So
> gpucc region has to be mapped by kgsl and that is reflected in the kgsl
> device tree.
>
> -Akhil
>
> >
> > BR,
> > -R
> >
> > > if (!ret) {
> > > DRM_DEV_ERROR(&pdev->dev, "Unable to map the %s registers\n", name);
> > > return ERR_PTR(-EINVAL);
> > > @@ -1613,13 +1607,13 @@ int a6xx_gmu_wrapper_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
> > > gmu->mmio = a6xx_gmu_get_mmio(pdev, "gmu");
> > > if (IS_ERR(gmu->mmio)) {
> > > ret = PTR_ERR(gmu->mmio);
> > > - goto err_mmio;
> > > + goto err_cleanup;
> > > }
> > >
> > > gmu->cxpd = dev_pm_domain_attach_by_name(gmu->dev, "cx");
> > > if (IS_ERR(gmu->cxpd)) {
> > > ret = PTR_ERR(gmu->cxpd);
> > > - goto err_mmio;
> > > + goto err_cleanup;
> > > }
> > >
> > > if (!device_link_add(gmu->dev, gmu->cxpd, DL_FLAG_PM_RUNTIME)) {
> > > @@ -1635,7 +1629,7 @@ int a6xx_gmu_wrapper_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
> > > gmu->gxpd = dev_pm_domain_attach_by_name(gmu->dev, "gx");
> > > if (IS_ERR(gmu->gxpd)) {
> > > ret = PTR_ERR(gmu->gxpd);
> > > - goto err_mmio;
> > > + goto err_cleanup;
> > > }
> > >
> > > gmu->initialized = true;
> > > @@ -1645,9 +1639,7 @@ int a6xx_gmu_wrapper_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
> > > detach_cxpd:
> > > dev_pm_domain_detach(gmu->cxpd, false);
> > >
> > > -err_mmio:
> > > - iounmap(gmu->mmio);
> > > -
> > > +err_cleanup:
> > > /* Drop reference taken in of_find_device_by_node */
> > > put_device(gmu->dev);
> > >
> > > @@ -1762,7 +1754,7 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
> > > gmu->rscc = a6xx_gmu_get_mmio(pdev, "rscc");
> > > if (IS_ERR(gmu->rscc)) {
> > > ret = -ENODEV;
> > > - goto err_mmio;
> > > + goto err_cleanup;
> > > }
> > > } else {
> > > gmu->rscc = gmu->mmio + 0x23000;
> > > @@ -1774,13 +1766,13 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
> > >
> > > if (gmu->hfi_irq < 0 || gmu->gmu_irq < 0) {
> > > ret = -ENODEV;
> > > - goto err_mmio;
> > > + goto err_cleanup;
> > > }
> > >
> > > gmu->cxpd = dev_pm_domain_attach_by_name(gmu->dev, "cx");
> > > if (IS_ERR(gmu->cxpd)) {
> > > ret = PTR_ERR(gmu->cxpd);
> > > - goto err_mmio;
> > > + goto err_cleanup;
> > > }
> > >
> > > link = device_link_add(gmu->dev, gmu->cxpd, DL_FLAG_PM_RUNTIME);
> > > @@ -1824,10 +1816,7 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
> > > detach_cxpd:
> > > dev_pm_domain_detach(gmu->cxpd, false);
> > >
> > > -err_mmio:
> > > - iounmap(gmu->mmio);
> > > - if (platform_get_resource_byname(pdev, IORESOURCE_MEM, "rscc"))
> > > - iounmap(gmu->rscc);
> > > +err_cleanup:
> > > free_irq(gmu->gmu_irq, gmu);
> > > free_irq(gmu->hfi_irq, gmu);
> > >
> > >
> > > ---
> > > base-commit: 1b294a1f35616977caddaddf3e9d28e576a1adbc
> > > change-id: 20240608-adreno-98c412bfdc03
> > >
> > > Best regards,
> > > --
> > > Kiarash Hajian <kiarash8112hajian@...il.com>
> > >
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