Re: [PATCH 1/3] drm/amdgpu: do not pass ttm_resource_manager to gtt_mgr

["Lazar, Lijo" <lijo.lazar@xxxxxxx>]

On 10/20/2021 2:18 PM, Das, Nirmoy wrote:
> On 10/20/2021 8:49 AM, Christian König wrote:
> > Am 19.10.21 um 20:14 schrieb Nirmoy Das:
> > > Do not allow exported amdgpu_gtt_mgr_*() to accept
> > > any ttm_resource_manager pointer. Also there is no need
> > > to force other module to call a ttm function just to
> > > eventually call gtt_mgr functions.
> >
> > That's a rather bad idea I think.
> >
> > The GTT and VRAM manager work on their respective objects and not on 
> > the adev directly.
>
>
> What is bothering me is : it is obvious that  the amdgpu_gtt_mgr_usage() 
> for example should only calculate
>
> usages for TTM_PL_TT type resource manager, why to pass that explicitly. 
> I am trying to leverage the fact that
>
> we only have one gtt/vram manager for a adev and the functions that I 
> changed  work on whole gtt/vram manager
>
> as a unit.

Don't know about the functional aspects. From a sofware perspective, 
amdgpu_gtt_mgr_*() operating on struct amdgpu_gtt_mgr *mgr seems more 
logical.

Thanks,
Lijo

> Regards,
>
> Nirmoy
>
>
> > Christian.
> >
> > > Signed-off-by: Nirmoy Das <nirmoy.das@xxxxxxx>
> > > ---
> > >   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c  |  4 +--
> > >   drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c | 31 ++++++++++++---------
> > >   drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c     |  4 +--
> > >   drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h     |  4 +--
> > >   4 files changed, 24 insertions(+), 19 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c 
> > > b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > > index 41ce86244144..5807df52031c 100644
> > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > > @@ -4287,7 +4287,7 @@ static int amdgpu_device_reset_sriov(struct 
> > > amdgpu_device *adev,
> > >         amdgpu_virt_init_data_exchange(adev);
> > >       /* we need recover gart prior to run SMC/CP/SDMA resume */
> > > - amdgpu_gtt_mgr_recover(ttm_manager_type(&adev->mman.bdev, TTM_PL_TT));
> > > +    amdgpu_gtt_mgr_recover(adev);
> > >         r = amdgpu_device_fw_loading(adev);
> > >       if (r)
> > > @@ -4604,7 +4604,7 @@ int amdgpu_do_asic_reset(struct list_head 
> > > *device_list_handle,
> > >                       amdgpu_inc_vram_lost(tmp_adev);
> > >                   }
> > >   -                r = 
> > > amdgpu_gtt_mgr_recover(ttm_manager_type(&tmp_adev->mman.bdev, 
> > > TTM_PL_TT));
> > > +                r = amdgpu_gtt_mgr_recover(tmp_adev);
> > >                   if (r)
> > >                       goto out;
> > >   diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c 
> > > b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> > > index c18f16b3be9c..5e41f8ef743a 100644
> > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> > > @@ -77,10 +77,8 @@ static ssize_t 
> > > amdgpu_mem_info_gtt_used_show(struct device *dev,
> > >   {
> > >       struct drm_device *ddev = dev_get_drvdata(dev);
> > >       struct amdgpu_device *adev = drm_to_adev(ddev);
> > > -    struct ttm_resource_manager *man;
> > >   -    man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT);
> > > -    return sysfs_emit(buf, "%llu\n", amdgpu_gtt_mgr_usage(man));
> > > +    return sysfs_emit(buf, "%llu\n", amdgpu_gtt_mgr_usage(adev));
> > >   }
> > >     static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO,
> > > @@ -206,14 +204,19 @@ static void amdgpu_gtt_mgr_del(struct 
> > > ttm_resource_manager *man,
> > >   /**
> > >    * amdgpu_gtt_mgr_usage - return usage of GTT domain
> > >    *
> > > - * @man: TTM memory type manager
> > > + * @adev: amdgpu_device pointer
> > >    *
> > >    * Return how many bytes are used in the GTT domain
> > >    */
> > > -uint64_t amdgpu_gtt_mgr_usage(struct ttm_resource_manager *man)
> > > +uint64_t amdgpu_gtt_mgr_usage(struct amdgpu_device *adev)
> > >   {
> > > -    struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
> > > -    s64 result = man->size - atomic64_read(&mgr->available);
> > > +    struct ttm_resource_manager *man;
> > > +    struct amdgpu_gtt_mgr *mgr;
> > > +    s64 result;
> > > +
> > > +    man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT);
> > > +    mgr = to_gtt_mgr(man);
> > > +    result = man->size - atomic64_read(&mgr->available);
> > >         return (result > 0 ? result : 0) * PAGE_SIZE;
> > >   }
> > > @@ -221,19 +224,20 @@ uint64_t amdgpu_gtt_mgr_usage(struct 
> > > ttm_resource_manager *man)
> > >   /**
> > >    * amdgpu_gtt_mgr_recover - re-init gart
> > >    *
> > > - * @man: TTM memory type manager
> > > + * @adev: amdgpu_device pointer
> > >    *
> > >    * Re-init the gart for each known BO in the GTT.
> > >    */
> > > -int amdgpu_gtt_mgr_recover(struct ttm_resource_manager *man)
> > > +int amdgpu_gtt_mgr_recover(struct amdgpu_device *adev)
> > >   {
> > > -    struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
> > > -    struct amdgpu_device *adev;
> > > +    struct ttm_resource_manager *man;
> > > +    struct amdgpu_gtt_mgr *mgr;
> > >       struct amdgpu_gtt_node *node;
> > >       struct drm_mm_node *mm_node;
> > >       int r = 0;
> > >   -    adev = container_of(mgr, typeof(*adev), mman.gtt_mgr);
> > > +    man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT);
> > > +    mgr = to_gtt_mgr(man);
> > >       spin_lock(&mgr->lock);
> > >       drm_mm_for_each_node(mm_node, &mgr->mm) {
> > >           node = container_of(mm_node, typeof(*node), base.mm_nodes[0]);
> > > @@ -260,6 +264,7 @@ static void amdgpu_gtt_mgr_debug(struct 
> > > ttm_resource_manager *man,
> > >                    struct drm_printer *printer)
> > >   {
> > >       struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
> > > +    struct amdgpu_device *adev = container_of(mgr, typeof(*adev), 
> > > mman.gtt_mgr);
> > >         spin_lock(&mgr->lock);
> > >       drm_mm_print(&mgr->mm, printer);
> > > @@ -267,7 +272,7 @@ static void amdgpu_gtt_mgr_debug(struct 
> > > ttm_resource_manager *man,
> > >         drm_printf(printer, "man size:%llu pages, gtt available:%lld 
> > > pages, usage:%lluMB\n",
> > >              man->size, (u64)atomic64_read(&mgr->available),
> > > -           amdgpu_gtt_mgr_usage(man) >> 20);
> > > +           amdgpu_gtt_mgr_usage(adev) >> 20);
> > >   }
> > >     static const struct ttm_resource_manager_func amdgpu_gtt_mgr_func 
> > > = {
> > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c 
> > > b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> > > index d2955ea4a62b..b9b38f70e416 100644
> > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> > > @@ -678,7 +678,7 @@ int amdgpu_info_ioctl(struct drm_device *dev, 
> > > void *data, struct drm_file *filp)
> > >           ui64 = 
> > > amdgpu_vram_mgr_vis_usage(ttm_manager_type(&adev->mman.bdev, 
> > > TTM_PL_VRAM));
> > >           return copy_to_user(out, &ui64, min(size, 8u)) ? -EFAULT : 0;
> > >       case AMDGPU_INFO_GTT_USAGE:
> > > -        ui64 = 
> > > amdgpu_gtt_mgr_usage(ttm_manager_type(&adev->mman.bdev, TTM_PL_TT));
> > > +        ui64 = amdgpu_gtt_mgr_usage(adev);
> > >           return copy_to_user(out, &ui64, min(size, 8u)) ? -EFAULT : 0;
> > >       case AMDGPU_INFO_GDS_CONFIG: {
> > >           struct drm_amdgpu_info_gds gds_info;
> > > @@ -738,7 +738,7 @@ int amdgpu_info_ioctl(struct drm_device *dev, 
> > > void *data, struct drm_file *filp)
> > >           mem.gtt.usable_heap_size = mem.gtt.total_heap_size -
> > >               atomic64_read(&adev->gart_pin_size);
> > >           mem.gtt.heap_usage =
> > > -            amdgpu_gtt_mgr_usage(gtt_man);
> > > +            amdgpu_gtt_mgr_usage(adev);
> > >           mem.gtt.max_allocation = mem.gtt.usable_heap_size * 3 / 4;
> > >             return copy_to_user(out, &mem,
> > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h 
> > > b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> > > index 91a087f9dc7c..6e337cacef51 100644
> > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> > > @@ -114,8 +114,8 @@ int amdgpu_vram_mgr_init(struct amdgpu_device 
> > > *adev);
> > >   void amdgpu_vram_mgr_fini(struct amdgpu_device *adev);
> > >     bool amdgpu_gtt_mgr_has_gart_addr(struct ttm_resource *mem);
> > > -uint64_t amdgpu_gtt_mgr_usage(struct ttm_resource_manager *man);
> > > -int amdgpu_gtt_mgr_recover(struct ttm_resource_manager *man);
> > > +uint64_t amdgpu_gtt_mgr_usage(struct amdgpu_device *adev);
> > > +int amdgpu_gtt_mgr_recover(struct amdgpu_device *adev);
> > >     uint64_t amdgpu_preempt_mgr_usage(struct ttm_resource_manager *man);