[PATCH 3/6] drm/amd/pp: Lock powerplay when reset pp table

[Zhu, Rex]

Please see inline.

Best Regards
Rex
________________________________
From: Alex Deucher <alexdeucher at gmail.com>
Sent: Thursday, March 22, 2018 9:17 PM
To: Zhu, Rex
Cc: amd-gfx list
Subject: Re: [PATCH 3/6] drm/amd/pp: Lock powerplay when reset pp table

On Thu, Mar 22, 2018 at 7:40 AM, Rex Zhu <Rex.Zhu at amd.com> wrote:
> Change-Id: Ib02cd71593bee9606822a466a56f2d01ac2e04cc
> Signed-off-by: Rex Zhu <Rex.Zhu at amd.com>

Please include a commit description.  It's not clear to me what's
happening here.

Alex

> ---
>  drivers/gpu/drm/amd/powerplay/amd_powerplay.c | 28 +++++++++++++--------------
>  1 file changed, 14 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/powerplay/amd_powerplay.c b/drivers/gpu/drm/amd/powerplay/amd_powerplay.c
> index 5d7d9ec..1ae4905 100644
> --- a/drivers/gpu/drm/amd/powerplay/amd_powerplay.c
> +++ b/drivers/gpu/drm/amd/powerplay/amd_powerplay.c
> @@ -31,8 +31,6 @@
>  #include "amdgpu.h"
>  #include "hwmgr.h"
>
> -static int pp_dpm_dispatch_tasks(void *handle, enum amd_pp_task task_id,
> -               enum amd_pm_state_type *user_state);
>
>  static const struct amd_pm_funcs pp_dpm_funcs;
>
> @@ -146,10 +144,12 @@ static int pp_late_init(void *handle)
>         struct amdgpu_device *adev = handle;
>         struct pp_hwmgr *hwmgr = adev->powerplay.pp_handle;
>
> -       if (hwmgr && hwmgr->pm_en)
> -               pp_dpm_dispatch_tasks(hwmgr,
> +       if (hwmgr && hwmgr->pm_en) {
> +               mutex_lock(&hwmgr->smu_lock);
> +               hwmgr_handle_task(hwmgr,
>                                         AMD_PP_TASK_COMPLETE_INIT, NULL);
> -
> +               mutex_unlock(&hwmgr->smu_lock);
> +       }
>         return 0;
>  }

Rex : use hwmgr_handle_task instand of  pp_dpm_dispatch_tasks. because i think it is not make sense that call
pp_function in ip_function.

> @@ -620,7 +620,7 @@ static int amd_powerplay_reset(void *handle)
>  static int pp_dpm_set_pp_table(void *handle, const char *buf, size_t size)
>  {
>         struct pp_hwmgr *hwmgr = handle;
> -       int ret = 0;
> +       int ret = -ENOMEM;
>
>         if (!hwmgr || !hwmgr->pm_en)
>                 return -EINVAL;
> @@ -630,28 +630,28 @@ static int pp_dpm_set_pp_table(void *handle, const char *buf, size_t size)
>                 hwmgr->hardcode_pp_table = kmemdup(hwmgr->soft_pp_table,
>                                                    hwmgr->soft_pp_table_size,
>                                                    GFP_KERNEL);
> -               if (!hwmgr->hardcode_pp_table) {
> -                       mutex_unlock(&hwmgr->smu_lock);
> -                       return -ENOMEM;
> -               }
> +               if (!hwmgr->hardcode_pp_table)
> +                       goto err;
>         }
>
>         memcpy(hwmgr->hardcode_pp_table, buf, size);
>
>         hwmgr->soft_pp_table = hwmgr->hardcode_pp_table;
> -       mutex_unlock(&hwmgr->smu_lock);
>
>         ret = amd_powerplay_reset(handle);
>         if (ret)
> -               return ret;
> +               goto err;
>
>         if (hwmgr->hwmgr_func->avfs_control) {
>                 ret = hwmgr->hwmgr_func->avfs_control(hwmgr, false);
>                 if (ret)
> -                       return ret;
> +                       goto err;
>         }
> -
> +       mutex_unlock(&hwmgr->smu_lock);
>         return 0;
> +err:
> +       mutex_unlock(&hwmgr->smu_lock);
> +       return ret;
>  }


Rex: unlock mutex until  set pp table complete to avoid other pp functions were called simultaneously<http://www.baidu.com/link?url=8RpXVOm53HQyZI9h-ZIs8Ipio9NEDj98vxJiiM0Wx4hbUUpanLuj7jZHEnm0Javd7_rpySIGVAwaxX_ICV-y2nDz_TZqF8mzUGZT8RPrw2WCcNsGFsoAh9nirArCSm9s>.


>  static int pp_dpm_force_clock_level(void *handle,
> --
> 1.9.1
>
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