Re: [PATCH v2 3/7] drm/msm/adreno: Implement SMEM-based speed bin

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On Wed, Jun 5, 2024 at 1:10 PM Konrad Dybcio <konrad.dybcio@xxxxxxxxxx> wrote:
>
> On recent (SM8550+) Snapdragon platforms, the GPU speed bin data is
> abstracted through SMEM, instead of being directly available in a fuse.
>
> Add support for SMEM-based speed binning, which includes getting
> "feature code" and "product code" from said source and parsing them
> to form something that lets us match OPPs against.
>
> Due to the product code being ignored in the context of Adreno on
> production parts (as of SM8650), hardcode it to SOCINFO_PC_UNKNOWN.
>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gpu.c      |  8 +++---
>  drivers/gpu/drm/msm/adreno/adreno_device.c |  2 ++
>  drivers/gpu/drm/msm/adreno/adreno_gpu.c    | 41 +++++++++++++++++++++++++++---
>  drivers/gpu/drm/msm/adreno/adreno_gpu.h    | 12 ++++++---
>  4 files changed, 53 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> index 973872ad0474..3f84417ff027 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> @@ -2894,13 +2894,15 @@ static u32 fuse_to_supp_hw(const struct adreno_info *info, u32 fuse)
>         return UINT_MAX;
>  }
>
> -static int a6xx_set_supported_hw(struct device *dev, const struct adreno_info *info)
> +static int a6xx_set_supported_hw(struct adreno_gpu *adreno_gpu,
> +                                struct device *dev,
> +                                const struct adreno_info *info)
>  {
>         u32 supp_hw;
>         u32 speedbin;
>         int ret;
>
> -       ret = adreno_read_speedbin(dev, &speedbin);
> +       ret = adreno_read_speedbin(adreno_gpu, dev, &speedbin);
>         /*
>          * -ENOENT means that the platform doesn't support speedbin which is
>          * fine
> @@ -3060,7 +3062,7 @@ struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
>
>         a6xx_llc_slices_init(pdev, a6xx_gpu, is_a7xx);
>
> -       ret = a6xx_set_supported_hw(&pdev->dev, config->info);
> +       ret = a6xx_set_supported_hw(adreno_gpu, &pdev->dev, config->info);
>         if (ret) {
>                 a6xx_llc_slices_destroy(a6xx_gpu);
>                 kfree(a6xx_gpu);
> diff --git a/drivers/gpu/drm/msm/adreno/adreno_device.c b/drivers/gpu/drm/msm/adreno/adreno_device.c
> index c3703a51287b..901ef767e491 100644
> --- a/drivers/gpu/drm/msm/adreno/adreno_device.c
> +++ b/drivers/gpu/drm/msm/adreno/adreno_device.c
> @@ -6,6 +6,8 @@
>   * Copyright (c) 2014,2017 The Linux Foundation. All rights reserved.
>   */
>
> +#include <linux/soc/qcom/socinfo.h>
> +
>  #include "adreno_gpu.h"
>
>  bool hang_debug = false;
> diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> index 074fb498706f..055072260b3d 100644
> --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> @@ -21,6 +21,9 @@
>  #include "msm_gem.h"
>  #include "msm_mmu.h"
>
> +#include <linux/soc/qcom/smem.h>
> +#include <linux/soc/qcom/socinfo.h>
> +
>  static u64 address_space_size = 0;
>  MODULE_PARM_DESC(address_space_size, "Override for size of processes private GPU address space");
>  module_param(address_space_size, ullong, 0600);
> @@ -1057,9 +1060,39 @@ void adreno_gpu_ocmem_cleanup(struct adreno_ocmem *adreno_ocmem)
>                            adreno_ocmem->hdl);
>  }
>
> -int adreno_read_speedbin(struct device *dev, u32 *speedbin)
> +int adreno_read_speedbin(struct adreno_gpu *adreno_gpu,
> +                        struct device *dev, u32 *fuse)
>  {
> -       return nvmem_cell_read_variable_le_u32(dev, "speed_bin", speedbin);
> +       u32 fcode;
> +       int ret;
> +
> +       /*
> +        * Try reading the speedbin via a nvmem cell first
> +        * -ENOENT means "no nvmem-cells" and essentially means "old DT" or
> +        * "nvmem fuse is irrelevant", simply assume it's fine.
> +        */
> +       ret = nvmem_cell_read_variable_le_u32(dev, "speed_bin", fuse);
> +       if (!ret)
> +               return 0;
> +       else if (ret != -ENOENT)
> +               return dev_err_probe(dev, ret, "Couldn't read the speed bin fuse value\n");
> +
> +#ifdef CONFIG_QCOM_SMEM
> +       /*
> +        * Only check the feature code - the product code only matters for
> +        * proto SoCs unavailable outside Qualcomm labs, as far as GPU bin
> +        * matching is concerned.
> +        *
> +        * Ignore EOPNOTSUPP, as not all SoCs expose this info through SMEM.
> +        */
> +       ret = qcom_smem_get_feature_code(&fcode);
> +       if (!ret) {
> +               *fuse = ADRENO_SKU_ID(fcode);
> +       } else if (ret != -EOPNOTSUPP)
> +               return dev_err_probe(dev, ret, "Couldn't get feature code from SMEM\n");
> +#endif
> +
> +       return 0;
>  }
>
>  int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
> @@ -1098,9 +1131,9 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
>                         devm_pm_opp_set_clkname(dev, "core");
>         }
>
> -       if (adreno_read_speedbin(dev, &speedbin) || !speedbin)
> +       if (adreno_read_speedbin(adreno_gpu, dev, &speedbin) || !speedbin)
>                 speedbin = 0xffff;
> -       adreno_gpu->speedbin = (uint16_t) (0xffff & speedbin);
> +       adreno_gpu->speedbin = speedbin;
>
>         gpu_name = devm_kasprintf(dev, GFP_KERNEL, "%"ADRENO_CHIPID_FMT,
>                         ADRENO_CHIPID_ARGS(config->chip_id));
> diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
> index 77526892eb8c..8f2b70eaf6ad 100644
> --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h
> +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
> @@ -81,7 +81,12 @@ extern const struct adreno_reglist a612_hwcg[], a615_hwcg[], a630_hwcg[], a640_h
>  extern const struct adreno_reglist a660_hwcg[], a690_hwcg[], a702_hwcg[], a730_hwcg[], a740_hwcg[];
>
>  struct adreno_speedbin {
> -       uint16_t fuse;
> +       /* <= 16-bit for NVMEM fuses, 32b for SOCID values */
> +       uint32_t fuse;
> +/* As of SM8650, PCODE on production SoCs is meaningless wrt the GPU bin */
> +#define ADRENO_SKU_ID_FCODE            GENMASK(15, 0)
> +#define ADRENO_SKU_ID(fcode)   (SOCINFO_PC_UNKNOWN << 16 | fcode)

So, as I understand this, we are actually only using the feature-code,
which is the low 16b.  So in reality the "fuse" is still only 16b?

BR,
-R

> +
>         uint16_t speedbin;
>  };
>
> @@ -136,7 +141,7 @@ struct adreno_gpu {
>         struct msm_gpu base;
>         const struct adreno_info *info;
>         uint32_t chip_id;
> -       uint16_t speedbin;
> +       uint32_t speedbin;
>         const struct adreno_gpu_funcs *funcs;
>
>         /* interesting register offsets to dump: */
> @@ -519,7 +524,8 @@ int adreno_fault_handler(struct msm_gpu *gpu, unsigned long iova, int flags,
>                          struct adreno_smmu_fault_info *info, const char *block,
>                          u32 scratch[4]);
>
> -int adreno_read_speedbin(struct device *dev, u32 *speedbin);
> +int adreno_read_speedbin(struct adreno_gpu *adreno_gpu,
> +                        struct device *dev, u32 *speedbin);
>
>  /*
>   * For a5xx and a6xx targets load the zap shader that is used to pull the GPU
>
> --
> 2.43.0
>





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