linux-kernel - Re: [Nouveau] [PATCH nouveau 09/11] drm: export some variable and functions to resue the PM functions

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Date:	Tue, 30 Dec 2014 11:18:34 +0800
From:	Vince Hsu <vinceh@...dia.com>
To:	Emil Velikov <emil.l.velikov@...il.com>,
	<thierry.reding@...il.com>, <swarren@...dotorg.org>,
	<gnurou@...il.com>, <bskeggs@...hat.com>, <martin.peres@...e.fr>,
	<seven@...rod-online.com>, <samuel.pitoiset@...il.com>
CC:	<linux-tegra@...r.kernel.org>, <nouveau@...ts.freedesktop.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Nouveau] [PATCH nouveau 09/11] drm: export some variable and
 functions to resue the PM functions

Hi Emil,

On 12/30/2014 10:34 AM, Emil Velikov wrote:
> On 23/12/14 10:40, Vince Hsu wrote:
>> This patch adds some checks in the suspend/resume functions to distinguish
>> the dGPU and mobile GPU and exports some variables/functions so that the
>> nouveau platform device can reuse them.
>>
> Hi Vince,
>
> Afaiu one needs to export a symbol as it's used by another module or
> subsystem. With the follow up two patches you are not doing either one,
> so I'd assume that you can just omit the EXPORT_* changes.
The nouveau platform device driver is built as another module - 
nouveau_platform.ko. :)

Thanks,
Vince

>
> I could be wrong though :-)
>
> Cheers
> Emil
>
>
>> Signed-off-by: Vince Hsu <vinceh@...dia.com>
>> ---
>>   drm/nouveau_drm.c | 16 +++++++++++-----
>>   drm/nouveau_drm.h |  2 ++
>>   2 files changed, 13 insertions(+), 5 deletions(-)
>>
>> diff --git a/drm/nouveau_drm.c b/drm/nouveau_drm.c
>> index afb93bb72f97..0ed99ef80211 100644
>> --- a/drm/nouveau_drm.c
>> +++ b/drm/nouveau_drm.c
>> @@ -72,6 +72,7 @@ module_param_named(modeset, nouveau_modeset, int, 0400);
>>   
>>   MODULE_PARM_DESC(runpm, "disable (0), force enable (1), optimus only default (-1)");
>>   int nouveau_runtime_pm = -1;
>> +EXPORT_SYMBOL(nouveau_runtime_pm);
>>   module_param_named(runpm, nouveau_runtime_pm, int, 0400);
>>   
>>   static struct drm_driver driver_stub;
>> @@ -543,7 +544,7 @@ nouveau_drm_remove(struct pci_dev *pdev)
>>   	nouveau_drm_device_remove(dev);
>>   }
>>   
>> -static int
>> +int
>>   nouveau_do_suspend(struct drm_device *dev, bool runtime)
>>   {
>>   	struct nouveau_drm *drm = nouveau_drm(dev);
>> @@ -559,8 +560,10 @@ nouveau_do_suspend(struct drm_device *dev, bool runtime)
>>   			return ret;
>>   	}
>>   
>> -	NV_INFO(drm, "evicting buffers...\n");
>> -	ttm_bo_evict_mm(&drm->ttm.bdev, TTM_PL_VRAM);
>> +	if (dev->pdev) {
>> +		NV_INFO(drm, "evicting buffers...\n");
>> +		ttm_bo_evict_mm(&drm->ttm.bdev, TTM_PL_VRAM);
>> +	}
>>   
>>   	NV_INFO(drm, "waiting for kernel channels to go idle...\n");
>>   	if (drm->cechan) {
>> @@ -612,8 +615,9 @@ fail_display:
>>   	}
>>   	return ret;
>>   }
>> +EXPORT_SYMBOL(nouveau_do_suspend);
>>   
>> -static int
>> +int
>>   nouveau_do_resume(struct drm_device *dev, bool runtime)
>>   {
>>   	struct nouveau_drm *drm = nouveau_drm(dev);
>> @@ -635,7 +639,8 @@ nouveau_do_resume(struct drm_device *dev, bool runtime)
>>   		nvif_client_resume(&cli->base);
>>   	}
>>   
>> -	nouveau_run_vbios_init(dev);
>> +	if (dev->pdev)
>> +		nouveau_run_vbios_init(dev);
>>   
>>   	if (dev->mode_config.num_crtc) {
>>   		NV_INFO(drm, "resuming display...\n");
>> @@ -646,6 +651,7 @@ nouveau_do_resume(struct drm_device *dev, bool runtime)
>>   
>>   	return 0;
>>   }
>> +EXPORT_SYMBOL(nouveau_do_resume);
>>   
>>   int
>>   nouveau_pmops_suspend(struct device *dev)
>> diff --git a/drm/nouveau_drm.h b/drm/nouveau_drm.h
>> index 8ae36f265fb8..897d295dd1e3 100644
>> --- a/drm/nouveau_drm.h
>> +++ b/drm/nouveau_drm.h
>> @@ -177,6 +177,8 @@ nouveau_drm(struct drm_device *dev)
>>   
>>   int nouveau_pmops_suspend(struct device *);
>>   int nouveau_pmops_resume(struct device *);
>> +int nouveau_do_suspend(struct drm_device *dev, bool runtime);
>> +int nouveau_do_resume(struct drm_device *dev, bool runtime);
>>   
>>   #define nouveau_platform_device_create(p, u)                                   \
>>   	nouveau_platform_device_create_(p, sizeof(**u), (void **)u)
>>

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