linux-kernel - Re: [PATCH 08/83] drm/radeon: Add calls to initialize and finalize kfd from radeon

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Date:	Thu, 17 Jul 2014 14:29:03 +0200
From:	Christian König <christian.koenig@....com>
To:	Oded Gabbay <oded.gabbay@....com>,
	Jerome Glisse <j.glisse@...il.com>,
	Oded Gabbay <oded.gabbay@...il.com>
CC:	David Airlie <airlied@...ux.ie>,
	Alex Deucher <alexander.deucher@....com>,
	<linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
	"John Bridgman" <John.Bridgman@....com>,
	Andrew Lewycky <Andrew.Lewycky@....com>,
	Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH 08/83] drm/radeon: Add calls to initialize and finalize
 kfd from radeon

Am 17.07.2014 13:57, schrieb Oded Gabbay:
> On 11/07/14 19:36, Jerome Glisse wrote:
>> On Fri, Jul 11, 2014 at 12:50:08AM +0300, Oded Gabbay wrote:
>>> The KFD driver should be loaded when the radeon driver is loaded and
>>> should be finalized when the radeon driver is removed.
>>>
>>> This patch adds a function call to initialize kfd from radeon_init
>>> and a function call to finalize kfd from radeon_exit.
>>>
>>> If the KFD driver is not present in the system, the initialize call
>>> fails and the radeon driver continues normally.
>>>
>>> This patch also adds calls to probe, initialize and finalize a kfd 
>>> device
>>> per radeon device using the kgd-->kfd interface.
>>>
>>> Signed-off-by: Oded Gabbay <oded.gabbay@....com>
>>
>> It might be nice to allow to build radeon without HSA so i think an
>> CONFIG_HSA should be added and have other thing depends on it.
>> Otherwise this one is.
>>
>> Reviewed-by: Jérôme Glisse <jglisse@...hat.com>
>>
> We do allow it :)
> There is no problem building radeon without the kfd. In that case, 
> when radeon finds out that kfd is not available, it simply moves on 
> with its initialization procedure.

At least off hand I don't see how this should work. Radeon directly 
calls radeon_kfd_(probe|init|fini) and so has a direct dependency on it.

Christian.

>
>     Oded
>>
>>> ---
>>>   drivers/gpu/drm/radeon/radeon_drv.c | 6 ++++++
>>>   drivers/gpu/drm/radeon/radeon_kms.c | 9 +++++++++
>>>   2 files changed, 15 insertions(+)
>>>
>>> diff --git a/drivers/gpu/drm/radeon/radeon_drv.c 
>>> b/drivers/gpu/drm/radeon/radeon_drv.c
>>> index cb14213..88a45a0 100644
>>> --- a/drivers/gpu/drm/radeon/radeon_drv.c
>>> +++ b/drivers/gpu/drm/radeon/radeon_drv.c
>>> @@ -151,6 +151,9 @@ static inline void 
>>> radeon_register_atpx_handler(void) {}
>>>   static inline void radeon_unregister_atpx_handler(void) {}
>>>   #endif
>>>
>>> +extern bool radeon_kfd_init(void);
>>> +extern void radeon_kfd_fini(void);
>>> +
>>>   int radeon_no_wb;
>>>   int radeon_modeset = -1;
>>>   int radeon_dynclks = -1;
>>> @@ -630,12 +633,15 @@ static int __init radeon_init(void)
>>>   #endif
>>>       }
>>>
>>> +    radeon_kfd_init();
>>> +
>>>       /* let modprobe override vga console setting */
>>>       return drm_pci_init(driver, pdriver);
>>>   }
>>>
>>>   static void __exit radeon_exit(void)
>>>   {
>>> +    radeon_kfd_fini();
>>>       drm_pci_exit(driver, pdriver);
>>>       radeon_unregister_atpx_handler();
>>>   }
>>> diff --git a/drivers/gpu/drm/radeon/radeon_kms.c 
>>> b/drivers/gpu/drm/radeon/radeon_kms.c
>>> index 35d9318..0748284 100644
>>> --- a/drivers/gpu/drm/radeon/radeon_kms.c
>>> +++ b/drivers/gpu/drm/radeon/radeon_kms.c
>>> @@ -34,6 +34,10 @@
>>>   #include <linux/slab.h>
>>>   #include <linux/pm_runtime.h>
>>>
>>> +extern void radeon_kfd_device_probe(struct radeon_device *rdev);
>>> +extern void radeon_kfd_device_init(struct radeon_device *rdev);
>>> +extern void radeon_kfd_device_fini(struct radeon_device *rdev);
>>> +
>>>   #if defined(CONFIG_VGA_SWITCHEROO)
>>>   bool radeon_has_atpx(void);
>>>   #else
>>> @@ -63,6 +67,8 @@ int radeon_driver_unload_kms(struct drm_device *dev)
>>>
>>>       pm_runtime_get_sync(dev->dev);
>>>
>>> +    radeon_kfd_device_fini(rdev);
>>> +
>>>       radeon_acpi_fini(rdev);
>>>
>>>       radeon_modeset_fini(rdev);
>>> @@ -142,6 +148,9 @@ int radeon_driver_load_kms(struct drm_device 
>>> *dev, unsigned long flags)
>>>                   "Error during ACPI methods call\n");
>>>       }
>>>
>>> +    radeon_kfd_device_probe(rdev);
>>> +    radeon_kfd_device_init(rdev);
>>> +
>>>       if (radeon_is_px(dev)) {
>>>           pm_runtime_use_autosuspend(dev->dev);
>>>           pm_runtime_set_autosuspend_delay(dev->dev, 5000);
>>> -- 
>>> 1.9.1
>>>
>

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