linux-kernel - Re: [PATCH 1/2] drm/amdkfd: Use bitmap

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Message-ID: <d43d9456-d2e4-2486-9970-8c358a599b6d@amd.com>
Date:   Tue, 26 Apr 2022 16:54:29 -0400
From:   Felix Kuehling <felix.kuehling@....com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        alexander.deucher@....com, christian.koenig@....com,
        Xinhui.Pan@....com, airlied@...ux.ie, daniel@...ll.ch
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/2] drm/amdkfd: Use bitmap_zalloc() when applicable


Am 2022-04-26 um 14:47 schrieb Christophe JAILLET:
> Le 26/04/2022 à 20:01, Felix Kuehling a écrit :
>> Hi Christophe,
>>
>> I just stumbled over this patch series while cleaning up my inbox. 
>> Sorry for dropping it back in November. I'm about to apply it but I 
>> noticed that patch 1 is missing a Signed-off-by. Is it OK to add that 
>> in your name?
>
> Hi,
>
> No problem for me if you can add it. Thanks.
> But if you prefer a v2, it is also fine for me.

No need. I submitted the patches to amd-staging-drm-next.

Regards,
   Felix


>
> BTW sorry for missing the SoB tag. This definitively means that I 
> forgot the checkpatch.pl step for this patch, which is bad.
>
> CJ
>
>>
>> Thanks,
>>    Felix
>>
>>
>> Am 2021-11-28 um 11:45 schrieb Christophe JAILLET:
>>> 'kfd->gtt_sa_bitmap' is a bitmap. So use 'bitmap_zalloc()' to simplify
>>> code, improve the semantic and avoid some open-coded arithmetic in
>>> allocator arguments.
>>>
>>> Also change the corresponding 'kfree()' into 'bitmap_free()' to keep
>>> consistency.
>>> ---
>>>   drivers/gpu/drm/amd/amdkfd/kfd_device.c | 12 +++---------
>>>   1 file changed, 3 insertions(+), 9 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c 
>>> b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
>>> index e1294fba0c26..c5a0ce44a295 100644
>>> --- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
>>> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
>>> @@ -1252,8 +1252,6 @@ int 
>>> kgd2kfd_schedule_evict_and_restore_process(struct mm_struct *mm,
>>>   static int kfd_gtt_sa_init(struct kfd_dev *kfd, unsigned int 
>>> buf_size,
>>>                   unsigned int chunk_size)
>>>   {
>>> -    unsigned int num_of_longs;
>>> -
>>>       if (WARN_ON(buf_size < chunk_size))
>>>           return -EINVAL;
>>>       if (WARN_ON(buf_size == 0))
>>> @@ -1264,11 +1262,8 @@ static int kfd_gtt_sa_init(struct kfd_dev 
>>> *kfd, unsigned int buf_size,
>>>       kfd->gtt_sa_chunk_size = chunk_size;
>>>       kfd->gtt_sa_num_of_chunks = buf_size / chunk_size;
>>> -    num_of_longs = (kfd->gtt_sa_num_of_chunks + BITS_PER_LONG - 1) /
>>> -        BITS_PER_LONG;
>>> -
>>> -    kfd->gtt_sa_bitmap = kcalloc(num_of_longs, sizeof(long), 
>>> GFP_KERNEL);
>>> -
>>> +    kfd->gtt_sa_bitmap = bitmap_zalloc(kfd->gtt_sa_num_of_chunks,
>>> +                       GFP_KERNEL);
>>>       if (!kfd->gtt_sa_bitmap)
>>>           return -ENOMEM;
>>> @@ -1278,13 +1273,12 @@ static int kfd_gtt_sa_init(struct kfd_dev 
>>> *kfd, unsigned int buf_size,
>>>       mutex_init(&kfd->gtt_sa_lock);
>>>       return 0;
>>> -
>>>   }
>>>   static void kfd_gtt_sa_fini(struct kfd_dev *kfd)
>>>   {
>>>       mutex_destroy(&kfd->gtt_sa_lock);
>>> -    kfree(kfd->gtt_sa_bitmap);
>>> +    bitmap_free(kfd->gtt_sa_bitmap);
>>>   }
>>>   static inline uint64_t kfd_gtt_sa_calc_gpu_addr(uint64_t start_addr,
>>
>