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SubjectRE: [PATCH 07/83] drm/radeon: Add kfd-->kgd interface of locking srbm_gfx_cntl register
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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@gmail.com]
>Sent: Friday, July 11, 2014 12:35 PM
>To: Oded Gabbay
>Cc: David Airlie; Deucher, Alexander; linux-kernel@vger.kernel.org; dri-
>devel@lists.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@amd.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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