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[83.9.29.190]) by smtp.gmail.com with ESMTPSA id t12-20020ac2548c000000b004f60e0ecc78sm3202487lfk.239.2023.06.16.17.00.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 16 Jun 2023 17:00:52 -0700 (PDT) Message-ID: <68e64a35-9705-6565-3b5c-5de38419aba8@linaro.org> Date: Sat, 17 Jun 2023 02:00:50 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.11.2 Subject: Re: [Freedreno] [PATCH v8 10/18] drm/msm/a6xx: Introduce GMU wrapper support Content-Language: en-US To: Akhil P Oommen Cc: Rob Clark , freedreno@lists.freedesktop.org, Conor Dooley , Krzysztof Kozlowski , devicetree@vger.kernel.org, Sean Paul , Bjorn Andersson , Konrad Dybcio , Abhinav Kumar , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Rob Clark , Rob Herring , Daniel Vetter , linux-arm-msm@vger.kernel.org, Dmitry Baryshkov , Marijn Suijten , David Airlie References: <20230223-topic-gmuwrapper-v8-0-69c68206609e@linaro.org> <20230223-topic-gmuwrapper-v8-10-69c68206609e@linaro.org> <2vr72w4tslxxumzphtuwgkcnbfjrtmw2j4qak2cukcabchadlg@spjbqoa7v4lr> From: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 16.06.2023 19:54, Akhil P Oommen wrote: > On Thu, Jun 15, 2023 at 11:43:04PM +0200, Konrad Dybcio wrote: >> >> On 10.06.2023 00:06, Akhil P Oommen wrote: >>> On Mon, May 29, 2023 at 03:52:29PM +0200, Konrad Dybcio wrote: >>>> >>>> Some (particularly SMD_RPM, a.k.a non-RPMh) SoCs implement A6XX GPUs >>>> but don't implement the associated GMUs. This is due to the fact that >>>> the GMU directly pokes at RPMh. Sadly, this means we have to take care >>>> of enabling & scaling power rails, clocks and bandwidth ourselves. >>>> >>>> Reuse existing Adreno-common code and modify the deeply-GMU-infused >>>> A6XX code to facilitate these GPUs. This involves if-ing out lots >>>> of GMU callbacks and introducing a new type of GMU - GMU wrapper (it's >>>> the actual name that Qualcomm uses in their downstream kernels). >>>> >>>> This is essentially a register region which is convenient to model >>>> as a device. We'll use it for managing the GDSCs. The register >>>> layout matches the actual GMU_CX/GX regions on the "real GMU" devices >>>> and lets us reuse quite a bit of gmu_read/write/rmw calls. >>>> >>>> Signed-off-by: Konrad Dybcio >>>> --- [...] >>>> + >>>> + ret = clk_bulk_prepare_enable(gpu->nr_clocks, gpu->grp_clks); >>>> + if (ret) >>>> + goto err_bulk_clk; >>>> + >>>> + /* If anything goes south, tear the GPU down piece by piece.. */ >>>> + if (ret) { >>>> +err_bulk_clk: >>> >>> Goto jump directly to another block looks odd to me. Why do you need this label >>> anyway? >> If clk_bulk_prepare_enable() fails, trying to proceed will hang the >> platform with unclocked accesses. We need to unwind everything that >> has been done up until that point, in reverse order. > > I missed this response from you earlier. > > But you are checking for 'ret' twice here. You will end up here even > if you don't jump! So "if (ret) goto err_bulk_clk;" looks > unnecessary. > > -Akhil. Ohhh right, silly mistake on my part ;) I already sent out a v9 since.. Please check it out and if you have any further comments, I'll fix this, and if not.. Perhaps I could fix it in an incremental patch if that revision is gtg? Konrad > >> >>> >>>> + pm_runtime_put(gmu->gxpd); >>>> + pm_runtime_put(gmu->dev); >>>> + dev_pm_opp_set_opp(&gpu->pdev->dev, NULL); >>>> + } >>>> +err_set_opp: >>> >>> Generally, it is better to name the label based on what you do here. For >>> eg: "unlock_lock:". >> That seems to be a mixed bag all throughout the kernel, I've seen many >> usages of err_(what went wrong) >> >>> >>> Also, this function is small enough that it is better to return directly >>> in case of error. I think that would be more readable. >> Not really, adding the necessary cleanup steps in `if (ret)` >> blocks would roughly double the function's size. >> >>> >>>> + mutex_unlock(&a6xx_gpu->gmu.lock); >>>> + >>>> + if (!ret) >>>> + msm_devfreq_resume(gpu); >>>> + >>>> + return ret; >>>> +} >>>> + >>>> +static int a6xx_gmu_pm_suspend(struct msm_gpu *gpu) >>>> { >>>> struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu); >>>> struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu); >>>> @@ -1720,7 +1799,40 @@ static int a6xx_pm_suspend(struct msm_gpu *gpu) >>>> return 0; >>>> } >>>> >>>> -static int a6xx_get_timestamp(struct msm_gpu *gpu, uint64_t *value) >>>> +static int a6xx_pm_suspend(struct msm_gpu *gpu) >>>> +{ >>>> + struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu); >>>> + struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu); >>>> + struct a6xx_gmu *gmu = &a6xx_gpu->gmu; >>>> + int i; >>>> + >>>> + trace_msm_gpu_suspend(0); >>>> + >>>> + msm_devfreq_suspend(gpu); >>>> + >>>> + mutex_lock(&a6xx_gpu->gmu.lock); >>> >>> Again, is this initialized somewhere? >>> >>>> + >>>> + /* Drain the outstanding traffic on memory buses */ >>>> + a6xx_bus_clear_pending_transactions(adreno_gpu, true); >>>> + >>>> + clk_bulk_disable_unprepare(gpu->nr_clocks, gpu->grp_clks); >>>> + >>>> + pm_runtime_put_sync(gmu->gxpd); >>>> + dev_pm_opp_set_opp(&gpu->pdev->dev, NULL); >>>> + pm_runtime_put_sync(gmu->dev); >>>> + >>>> + mutex_unlock(&a6xx_gpu->gmu.lock); >>>> + >>>> + if (a6xx_gpu->shadow_bo) >>>> + for (i = 0; i < gpu->nr_rings; i++) >>>> + a6xx_gpu->shadow[i] = 0; >>>> + >>>> + gpu->suspend_count++; >>>> + >>>> + return 0; >>>> +} >>>> + >>>> +static int a6xx_gmu_get_timestamp(struct msm_gpu *gpu, uint64_t *value) >>>> { >>>> struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu); >>>> struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu); >>>> @@ -1739,6 +1851,12 @@ static int a6xx_get_timestamp(struct msm_gpu *gpu, uint64_t *value) >>>> return 0; >>>> } >>>> >>>> +static int a6xx_get_timestamp(struct msm_gpu *gpu, uint64_t *value) >>>> +{ >>>> + *value = gpu_read64(gpu, REG_A6XX_CP_ALWAYS_ON_COUNTER); >>>> + return 0; >>>> +} >>>> + >>>> static struct msm_ringbuffer *a6xx_active_ring(struct msm_gpu *gpu) >>>> { >>>> struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu); >>>> @@ -2004,8 +2122,8 @@ static const struct adreno_gpu_funcs funcs = { >>>> .set_param = adreno_set_param, >>>> .hw_init = a6xx_hw_init, >>>> .ucode_load = a6xx_ucode_load, >>>> - .pm_suspend = a6xx_pm_suspend, >>>> - .pm_resume = a6xx_pm_resume, >>>> + .pm_suspend = a6xx_gmu_pm_suspend, >>>> + .pm_resume = a6xx_gmu_pm_resume, >>>> .recover = a6xx_recover, >>>> .submit = a6xx_submit, >>>> .active_ring = a6xx_active_ring, >>>> @@ -2020,6 +2138,35 @@ static const struct adreno_gpu_funcs funcs = { >>>> #if defined(CONFIG_DRM_MSM_GPU_STATE) >>>> .gpu_state_get = a6xx_gpu_state_get, >>>> .gpu_state_put = a6xx_gpu_state_put, >>>> +#endif >>>> + .create_address_space = a6xx_create_address_space, >>>> + .create_private_address_space = a6xx_create_private_address_space, >>>> + .get_rptr = a6xx_get_rptr, >>>> + .progress = a6xx_progress, >>>> + }, >>>> + .get_timestamp = a6xx_gmu_get_timestamp, >>>> +}; >>>> + >>>> +static const struct adreno_gpu_funcs funcs_gmuwrapper = { >>>> + .base = { >>>> + .get_param = adreno_get_param, >>>> + .set_param = adreno_set_param, >>>> + .hw_init = a6xx_hw_init, >>>> + .ucode_load = a6xx_ucode_load, >>>> + .pm_suspend = a6xx_pm_suspend, >>>> + .pm_resume = a6xx_pm_resume, >>>> + .recover = a6xx_recover, >>>> + .submit = a6xx_submit, >>>> + .active_ring = a6xx_active_ring, >>>> + .irq = a6xx_irq, >>>> + .destroy = a6xx_destroy, >>>> +#if defined(CONFIG_DRM_MSM_GPU_STATE) >>>> + .show = a6xx_show, >>>> +#endif >>>> + .gpu_busy = a6xx_gpu_busy, >>>> +#if defined(CONFIG_DRM_MSM_GPU_STATE) >>>> + .gpu_state_get = a6xx_gpu_state_get, >>>> + .gpu_state_put = a6xx_gpu_state_put, >>>> #endif >>>> .create_address_space = a6xx_create_address_space, >>>> .create_private_address_space = a6xx_create_private_address_space, >>>> @@ -2050,15 +2197,31 @@ struct msm_gpu *a6xx_gpu_init(struct drm_device *dev) >>>> >>>> adreno_gpu->registers = NULL; >>>> >>>> + /* Check if there is a GMU phandle and set it up */ >>>> + node = of_parse_phandle(pdev->dev.of_node, "qcom,gmu", 0); >>>> + /* FIXME: How do we gracefully handle this? */ >>>> + BUG_ON(!node); >>>> + >>>> + adreno_gpu->gmu_is_wrapper = of_device_is_compatible(node, "qcom,adreno-gmu-wrapper"); >>>> + >>>> /* >>>> * We need to know the platform type before calling into adreno_gpu_init >>>> * so that the hw_apriv flag can be correctly set. Snoop into the info >>>> * and grab the revision number >>>> */ >>>> info = adreno_info(config->rev); >>>> - >>>> - if (info && (info->revn == 650 || info->revn == 660 || >>>> - adreno_cmp_rev(ADRENO_REV(6, 3, 5, ANY_ID), info->rev))) >>>> + if (!info) >>>> + return ERR_PTR(-EINVAL); >>>> + >>>> + /* Assign these early so that we can use the is_aXYZ helpers */ >>>> + /* Numeric revision IDs (e.g. 630) */ >>>> + adreno_gpu->revn = info->revn; >>>> + /* New-style ADRENO_REV()-only */ >>>> + adreno_gpu->rev = info->rev; >>>> + /* Quirk data */ >>>> + adreno_gpu->info = info; >>>> + >>>> + if (adreno_is_a650(adreno_gpu) || adreno_is_a660_family(adreno_gpu)) >>>> adreno_gpu->base.hw_apriv = true; >>>> >>>> a6xx_llc_slices_init(pdev, a6xx_gpu); >>>> @@ -2069,7 +2232,10 @@ struct msm_gpu *a6xx_gpu_init(struct drm_device *dev) >>>> return ERR_PTR(ret); >>>> } >>>> >>>> - ret = adreno_gpu_init(dev, pdev, adreno_gpu, &funcs, 1); >>>> + if (adreno_has_gmu_wrapper(adreno_gpu)) >>>> + ret = adreno_gpu_init(dev, pdev, adreno_gpu, &funcs_gmuwrapper, 1); >>>> + else >>>> + ret = adreno_gpu_init(dev, pdev, adreno_gpu, &funcs, 1); >>>> if (ret) { >>>> a6xx_destroy(&(a6xx_gpu->base.base)); >>>> return ERR_PTR(ret); >>>> @@ -2082,13 +2248,10 @@ struct msm_gpu *a6xx_gpu_init(struct drm_device *dev) >>>> if (adreno_is_a618(adreno_gpu) || adreno_is_7c3(adreno_gpu)) >>>> priv->gpu_clamp_to_idle = true; >>>> >>>> - /* Check if there is a GMU phandle and set it up */ >>>> - node = of_parse_phandle(pdev->dev.of_node, "qcom,gmu", 0); >>>> - >>>> - /* FIXME: How do we gracefully handle this? */ >>>> - BUG_ON(!node); >>>> - >>>> - ret = a6xx_gmu_init(a6xx_gpu, node); >>>> + if (adreno_has_gmu_wrapper(adreno_gpu)) >>>> + ret = a6xx_gmu_wrapper_init(a6xx_gpu, node); >>>> + else >>>> + ret = a6xx_gmu_init(a6xx_gpu, node); >>>> of_node_put(node); >>>> if (ret) { >>>> a6xx_destroy(&(a6xx_gpu->base.base)); >>>> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h >>>> index aa70390ee1c6..c788b06e72da 100644 >>>> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h >>>> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h >>>> @@ -76,6 +76,7 @@ int a6xx_gmu_set_oob(struct a6xx_gmu *gmu, enum a6xx_gmu_oob_state state); >>>> void a6xx_gmu_clear_oob(struct a6xx_gmu *gmu, enum a6xx_gmu_oob_state state); >>>> >>>> int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node); >>>> +int a6xx_gmu_wrapper_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node); >>>> void a6xx_gmu_remove(struct a6xx_gpu *a6xx_gpu); >>>> >>>> void a6xx_gmu_set_freq(struct msm_gpu *gpu, struct dev_pm_opp *opp, >>>> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c >>>> index 30ecdff363e7..4e5d650578c6 100644 >>>> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c >>>> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c >>>> @@ -1041,16 +1041,18 @@ struct msm_gpu_state *a6xx_gpu_state_get(struct msm_gpu *gpu) >>>> /* Get the generic state from the adreno core */ >>>> adreno_gpu_state_get(gpu, &a6xx_state->base); >>>> >>>> - a6xx_get_gmu_registers(gpu, a6xx_state); >>>> + if (!adreno_has_gmu_wrapper(adreno_gpu)) { >>>> + a6xx_get_gmu_registers(gpu, a6xx_state); >>>> >>>> - a6xx_state->gmu_log = a6xx_snapshot_gmu_bo(a6xx_state, &a6xx_gpu->gmu.log); >>>> - a6xx_state->gmu_hfi = a6xx_snapshot_gmu_bo(a6xx_state, &a6xx_gpu->gmu.hfi); >>>> - a6xx_state->gmu_debug = a6xx_snapshot_gmu_bo(a6xx_state, &a6xx_gpu->gmu.debug); >>>> + a6xx_state->gmu_log = a6xx_snapshot_gmu_bo(a6xx_state, &a6xx_gpu->gmu.log); >>>> + a6xx_state->gmu_hfi = a6xx_snapshot_gmu_bo(a6xx_state, &a6xx_gpu->gmu.hfi); >>>> + a6xx_state->gmu_debug = a6xx_snapshot_gmu_bo(a6xx_state, &a6xx_gpu->gmu.debug); >>>> / >>>> - a6xx_snapshot_gmu_hfi_history(gpu, a6xx_state); >>>> + a6xx_snapshot_gmu_hfi_history(gpu, a6xx_state); >>>> + } >>>> >>>> /* If GX isn't on the rest of the data isn't going to be accessible */ >>>> - if (!a6xx_gmu_gx_is_on(&a6xx_gpu->gmu)) >>>> + if (!adreno_has_gmu_wrapper(adreno_gpu) && !a6xx_gmu_gx_is_on(&a6xx_gpu->gmu)) >>>> return &a6xx_state->base; >>>> >>>> /* Get the banks of indexed registers */ >>>> diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c >>>> index 6934cee07d42..5c5901d65950 100644 >>>> --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c >>>> +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c >>>> @@ -528,6 +528,10 @@ int adreno_load_fw(struct adreno_gpu *adreno_gpu) >>>> if (!adreno_gpu->info->fw[i]) >>>> continue; >>>> >>>> + /* Skip loading GMU firwmare with GMU Wrapper */ >>>> + if (adreno_has_gmu_wrapper(adreno_gpu) && i == ADRENO_FW_GMU) >>>> + continue; >>>> + >>>> /* Skip if the firmware has already been loaded */ >>>> if (adreno_gpu->fw[i]) >>>> continue; >>>> @@ -1074,8 +1078,8 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev, >>>> u32 speedbin; >>>> int ret; >>>> >>>> - /* Only handle the core clock when GMU is not in use */ >>>> - if (config->rev.core < 6) { >>>> + /* Only handle the core clock when GMU is not in use (or is absent). */ >>>> + if (adreno_has_gmu_wrapper(adreno_gpu) || config->rev.core < 6) { >>>> /* >>>> * This can only be done before devm_pm_opp_of_add_table(), or >>>> * dev_pm_opp_set_config() will WARN_ON() >>>> diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h >>>> index f62612a5c70f..ee5352bc5329 100644 >>>> --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h >>>> +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h >>>> @@ -115,6 +115,7 @@ struct adreno_gpu { >>>> * code (a3xx_gpu.c) and stored in this common location. >>>> */ >>>> const unsigned int *reg_offsets; >>>> + bool gmu_is_wrapper; >>>> }; >>>> #define to_adreno_gpu(x) container_of(x, struct adreno_gpu, base) >>>> >>>> @@ -145,6 +146,11 @@ struct adreno_platform_config { >>>> >>>> bool adreno_cmp_rev(struct adreno_rev rev1, struct adreno_rev rev2); >>>> >>>> +static inline bool adreno_has_gmu_wrapper(struct adreno_gpu *gpu) >>>> +{ >>>> + return gpu->gmu_is_wrapper; >>>> +} >>>> + >>>> static inline bool adreno_is_a2xx(struct adreno_gpu *gpu) >>>> { >>>> return (gpu->revn < 300); >>>> >>>> -- >>>> 2.40.1 >>>> >>> >>> I am still not fully onboard with the idea of gmu_wrapper node in devicetree. >>> Aside from that, I don't see any other issue. Please check the few comments I left. >> Thanks for your review! >> >> Konrad >>> >>> -Akhil. >>>