linux-kernel - RE: [PATCH 07/83] drm/radeon: Add kfd-->kgd interface of locking srbm_gfx

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Date:	Fri, 11 Jul 2014 17:48:02 +0000
From:	"Bridgman, John" <John.Bridgman@....com>
To:	Jerome Glisse <j.glisse@...il.com>,
	Oded Gabbay <oded.gabbay@...il.com>
CC:	David Airlie <airlied@...ux.ie>,
	"Deucher, Alexander" <Alexander.Deucher@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"Lewycky, Andrew" <Andrew.Lewycky@....com>,
	Joerg Roedel <joro@...tes.org>,
	"Gabbay, Oded" <Oded.Gabbay@....com>,
	"Koenig, Christian" <Christian.Koenig@....com>
Subject: RE: [PATCH 07/83] drm/radeon: Add kfd-->kgd interface of locking
 srbm_gfx_cntl register

Checking... we shouldn't need to call the lock from kfd any more.We should be able to do any required locking in radeon kgd code.

>-----Original Message-----
>From: Jerome Glisse [mailto:j.glisse@...il.com]
>Sent: Friday, July 11, 2014 12:35 PM
>To: Oded Gabbay
>Cc: David Airlie; Deucher, Alexander; linux-kernel@...r.kernel.org; dri-
>devel@...ts.freedesktop.org; Bridgman, John; Lewycky, Andrew; Joerg
>Roedel; Gabbay, Oded; Koenig, Christian
>Subject: Re: [PATCH 07/83] drm/radeon: Add kfd-->kgd interface of locking
>srbm_gfx_cntl register
>
>On Fri, Jul 11, 2014 at 12:50:07AM +0300, Oded Gabbay wrote:
>> This patch adds a new interface to kfd2kgd_calls structure, which
>> allows the kfd to lock and unlock the srbm_gfx_cntl register
>
>Why does kfd needs to lock this register if kfd can not access any of those
>register ? This sounds broken to me, exposing a driver internal mutex to
>another driver is not something i am fan of.
>
>Cheers,
>Jérôme
>
>>
>> Signed-off-by: Oded Gabbay <oded.gabbay@....com>
>> ---
>>  drivers/gpu/drm/radeon/radeon_kfd.c | 20 ++++++++++++++++++++
>>  include/linux/radeon_kfd.h          |  4 ++++
>>  2 files changed, 24 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/radeon/radeon_kfd.c
>> b/drivers/gpu/drm/radeon/radeon_kfd.c
>> index 66ee36b..594020e 100644
>> --- a/drivers/gpu/drm/radeon/radeon_kfd.c
>> +++ b/drivers/gpu/drm/radeon/radeon_kfd.c
>> @@ -43,6 +43,10 @@ static void unkmap_mem(struct kgd_dev *kgd, struct
>> kgd_mem *mem);
>>
>>  static uint64_t get_vmem_size(struct kgd_dev *kgd);
>>
>> +static void lock_srbm_gfx_cntl(struct kgd_dev *kgd); static void
>> +unlock_srbm_gfx_cntl(struct kgd_dev *kgd);
>> +
>> +
>>  static const struct kfd2kgd_calls kfd2kgd = {
>>  	.allocate_mem = allocate_mem,
>>  	.free_mem = free_mem,
>> @@ -51,6 +55,8 @@ static const struct kfd2kgd_calls kfd2kgd = {
>>  	.kmap_mem = kmap_mem,
>>  	.unkmap_mem = unkmap_mem,
>>  	.get_vmem_size = get_vmem_size,
>> +	.lock_srbm_gfx_cntl = lock_srbm_gfx_cntl,
>> +	.unlock_srbm_gfx_cntl = unlock_srbm_gfx_cntl,
>>  };
>>
>>  static const struct kgd2kfd_calls *kgd2kfd; @@ -233,3 +239,17 @@
>> static uint64_t get_vmem_size(struct kgd_dev *kgd)
>>
>>  	return rdev->mc.real_vram_size;
>>  }
>> +
>> +static void lock_srbm_gfx_cntl(struct kgd_dev *kgd) {
>> +	struct radeon_device *rdev = (struct radeon_device *)kgd;
>> +
>> +	mutex_lock(&rdev->srbm_mutex);
>> +}
>> +
>> +static void unlock_srbm_gfx_cntl(struct kgd_dev *kgd) {
>> +	struct radeon_device *rdev = (struct radeon_device *)kgd;
>> +
>> +	mutex_unlock(&rdev->srbm_mutex);
>> +}
>> diff --git a/include/linux/radeon_kfd.h b/include/linux/radeon_kfd.h
>> index c7997d4..40b691c 100644
>> --- a/include/linux/radeon_kfd.h
>> +++ b/include/linux/radeon_kfd.h
>> @@ -81,6 +81,10 @@ struct kfd2kgd_calls {
>>  	void (*unkmap_mem)(struct kgd_dev *kgd, struct kgd_mem *mem);
>>
>>  	uint64_t (*get_vmem_size)(struct kgd_dev *kgd);
>> +
>> +	/* SRBM_GFX_CNTL mutex */
>> +	void (*lock_srbm_gfx_cntl)(struct kgd_dev *kgd);
>> +	void (*unlock_srbm_gfx_cntl)(struct kgd_dev *kgd);
>>  };
>>
>>  bool kgd2kfd_init(unsigned interface_version,
>> --
>> 1.9.1
>>
--
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