Re: [PATCH 6/9] drm/amdgpu: remove VRAM accounting

On Wed, 9 Feb 2022 at 08:41, Christian König ckoenig.leichtzumerken@gmail.com wrote:

This is provided by TTM now.

Also switch man->size to bytes instead of pages and fix the double printing of size and usage in debugfs.

Signed-off-by: Christian König christian.koenig@amd.com Tested-by: Bas Nieuwenhuizen bas@basnieuwenhuizen.nl

---

drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 2 +- drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 6 +- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 2 +- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h | 2 - drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c | 6 +- drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 58 +++++++------------- 6 files changed, 31 insertions(+), 45 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c index e8440d306496..025748e9c772 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c @@ -314,7 +314,7 @@ static void amdgpu_cs_get_threshold_for_moves(struct amdgpu_device *adev, }

    total_vram = adev->gmc.real_vram_size - atomic64_read(&adev->vram_pin_size);

•   used_vram = amdgpu_vram_mgr_usage(&adev->mman.vram_mgr);
  

•   used_vram = ttm_resource_manager_usage(&adev->mman.vram_mgr.manager);
    free_vram = used_vram >= total_vram ? 0 : total_vram - used_vram;
  
    spin_lock(&adev->mm_stats.lock);
  

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c index 9ff4aced5da7..0beab961b18b 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 = atomic64_read(&adev->num_vram_cpu_page_faults); return copy_to_user(out, &ui64, min(size, 8u)) ? -EFAULT : 0; case AMDGPU_INFO_VRAM_USAGE:

•           ui64 = amdgpu_vram_mgr_usage(&adev->mman.vram_mgr);
  

•           ui64 = ttm_resource_manager_usage(&adev->mman.vram_mgr.manager);
            return copy_to_user(out, &ui64, min(size, 8u)) ? -EFAULT : 0;
    case AMDGPU_INFO_VIS_VRAM_USAGE:
            ui64 = amdgpu_vram_mgr_vis_usage(&adev->mman.vram_mgr);
  

@@ -717,6 +717,8 @@ int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp) struct drm_amdgpu_memory_info mem; struct ttm_resource_manager *gtt_man = &adev->mman.gtt_mgr.manager;

•           struct ttm_resource_manager *vram_man =
  

•                   &adev->mman.vram_mgr.manager;
  
            memset(&mem, 0, sizeof(mem));
            mem.vram.total_heap_size = adev->gmc.real_vram_size;
  

@@ -724,7 +726,7 @@ int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp) atomic64_read(&adev->vram_pin_size) - AMDGPU_VM_RESERVED_VRAM; mem.vram.heap_usage =

•                   amdgpu_vram_mgr_usage(&adev->mman.vram_mgr);
  

•                   ttm_resource_manager_usage(vram_man);
            mem.vram.max_allocation = mem.vram.usable_heap_size * 3 / 4;
  
            mem.cpu_accessible_vram.total_heap_size =
  

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c index d178fbec7048..5859ed0552a4 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c @@ -1884,7 +1884,7 @@ void amdgpu_ttm_set_buffer_funcs_status(struct amdgpu_device *adev, bool enable) size = adev->gmc.real_vram_size; else size = adev->gmc.visible_vram_size;

•   man->size = size >> PAGE_SHIFT;
  

•   man->size = size;
    adev->mman.buffer_funcs_enabled = enable;
  

}

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h index 120b69ec9885..cbee84a77331 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h @@ -44,7 +44,6 @@ struct amdgpu_vram_mgr { spinlock_t lock; struct list_head reservations_pending; struct list_head reserved_pages;

•   atomic64_t usage;
    atomic64_t vis_usage;
  

};

@@ -127,7 +126,6 @@ int amdgpu_vram_mgr_alloc_sgt(struct amdgpu_device *adev, void amdgpu_vram_mgr_free_sgt(struct device *dev, enum dma_data_direction dir, struct sg_table *sgt); -uint64_t amdgpu_vram_mgr_usage(struct amdgpu_vram_mgr *mgr); uint64_t amdgpu_vram_mgr_vis_usage(struct amdgpu_vram_mgr *mgr); int amdgpu_vram_mgr_reserve_range(struct amdgpu_vram_mgr *mgr, uint64_t start, uint64_t size); diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c index 07bc0f504713..3a25dd220786 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c @@ -575,8 +575,10 @@ static int amdgpu_virt_write_vf2pf_data(struct amdgpu_device *adev) vf2pf_info->driver_cert = 0; vf2pf_info->os_info.all = 0;

•   vf2pf_info->fb_usage = amdgpu_vram_mgr_usage(&adev->mman.vram_mgr) >> 20;
  

•   vf2pf_info->fb_vis_usage = amdgpu_vram_mgr_vis_usage(&adev->mman.vram_mgr) >> 20;
  

•   vf2pf_info->fb_usage =
  

•           ttm_resource_manager_usage(&adev->mman.vram_mgr.manager) >> 20;
  

•   vf2pf_info->fb_vis_usage =
  

•           amdgpu_vram_mgr_vis_usage(&adev->mman.vram_mgr) >> 20;
    vf2pf_info->fb_size = adev->gmc.real_vram_size >> 20;
    vf2pf_info->fb_vis_size = adev->gmc.visible_vram_size >> 20;
  
  

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c index 7442095f089c..e50fe25fbcb8 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c @@ -96,9 +96,9 @@ static ssize_t amdgpu_mem_info_vram_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 = &adev->mman.vram_mgr.manager;
  
  

•   return sysfs_emit(buf, "%llu\n",
  

•                     amdgpu_vram_mgr_usage(&adev->mman.vram_mgr));
  

•   return sysfs_emit(buf, "%llu\n", ttm_resource_manager_usage(man));
  

}

/** @@ -253,7 +253,9 @@ static void amdgpu_vram_mgr_do_reserve(struct ttm_resource_manager *man)

            vis_usage = amdgpu_vram_mgr_vis_size(adev, &rsv->mm_node);
            atomic64_add(vis_usage, &mgr->vis_usage);

•           atomic64_add(rsv->mm_node.size << PAGE_SHIFT, &mgr->usage);
  

•           spin_lock(&man->bdev->lru_lock);
  

•           man->usage += rsv->mm_node.size << PAGE_SHIFT;
  

•           spin_unlock(&man->bdev->lru_lock);
            list_move(&rsv->node, &mgr->reserved_pages);
    }
  

} @@ -378,19 +380,13 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man,

    lpfn = place->lpfn;
    if (!lpfn)

•           lpfn = man->size;
  

•           lpfn = man->size >> PAGE_SHIFT;
  
    max_bytes = adev->gmc.mc_vram_size;
    if (tbo->type != ttm_bo_type_kernel)
            max_bytes -= AMDGPU_VM_RESERVED_VRAM;
  
  

•   /* bail out quickly if there's likely not enough VRAM for this BO */
    mem_bytes = tbo->base.size;
  

•   if (atomic64_add_return(mem_bytes, &mgr->usage) > max_bytes) {
  

•           r = -ENOSPC;
  

•           goto error_sub;
  

•   }
  

•   if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
            pages_per_node = ~0ul;
            num_nodes = 1;
  

@@ -408,13 +404,17 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man,

    node = kvmalloc(struct_size(node, mm_nodes, num_nodes),
                    GFP_KERNEL | __GFP_ZERO);

•   if (!node) {
  

•           r = -ENOMEM;
  

•           goto error_sub;
  

•   }
  

•   if (!node)
  

•           return -ENOMEM;
  
    ttm_resource_init(tbo, place, &node->base);
  
  

•   /* bail out quickly if there's likely not enough VRAM for this BO */
  

•   if (ttm_resource_manager_usage(man) > max_bytes) {
  

•           r = -ENOSPC;
  

•           goto error_fini;
  

•   }
  

•   mode = DRM_MM_INSERT_BEST;
    if (place->flags & TTM_PL_FLAG_TOPDOWN)
            mode = DRM_MM_INSERT_HIGH;
  

@@ -472,11 +472,10 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man, while (i--) drm_mm_remove_node(&node->mm_nodes[i]); spin_unlock(&mgr->lock); +error_fini: ttm_resource_fini(man, &node->base); kvfree(node);

-error_sub:

•   atomic64_sub(mem_bytes, &mgr->usage);
    return r;
  

}

@@ -494,7 +493,7 @@ static void amdgpu_vram_mgr_del(struct ttm_resource_manager *man, struct ttm_range_mgr_node *node = to_ttm_range_mgr_node(res); struct amdgpu_vram_mgr *mgr = to_vram_mgr(man); struct amdgpu_device *adev = to_amdgpu_device(mgr);

•   uint64_t usage = 0, vis_usage = 0;
  

•   uint64_t vis_usage = 0;
    unsigned i, pages;
  
    spin_lock(&mgr->lock);
  

@@ -503,13 +502,11 @@ static void amdgpu_vram_mgr_del(struct ttm_resource_manager *man, struct drm_mm_node *mm = &node->mm_nodes[i];

            drm_mm_remove_node(mm);

•           usage += mm->size << PAGE_SHIFT;
            vis_usage += amdgpu_vram_mgr_vis_size(adev, mm);
    }
    amdgpu_vram_mgr_do_reserve(man);
    spin_unlock(&mgr->lock);
  
  

•   atomic64_sub(usage, &mgr->usage);
    atomic64_sub(vis_usage, &mgr->vis_usage);
  
    ttm_resource_fini(man, res);
  

@@ -627,18 +624,6 @@ void amdgpu_vram_mgr_free_sgt(struct device *dev, kfree(sgt); }

-/**

• • amdgpu_vram_mgr_usage - how many bytes are used in this domain
• • @mgr: amdgpu_vram_mgr pointer
• • Returns how many bytes are used in this domain.
• */

-uint64_t amdgpu_vram_mgr_usage(struct amdgpu_vram_mgr *mgr) -{

•   return atomic64_read(&mgr->usage);
  

-}

/**

• amdgpu_vram_mgr_vis_usage - how many bytes are used in the visible part

@@ -664,13 +649,12 @@ static void amdgpu_vram_mgr_debug(struct ttm_resource_manager *man, { struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);

•   drm_printf(printer, "  vis usage:%llu\n",
  

•              amdgpu_vram_mgr_vis_usage(mgr));
  

•   spin_lock(&mgr->lock);
    drm_mm_print(&mgr->mm, printer);
    spin_unlock(&mgr->lock);
  

•   drm_printf(printer, "man size:%llu pages, ram usage:%lluMB, vis usage:%lluMB\n",
  

•              man->size, amdgpu_vram_mgr_usage(mgr) >> 20,
  

•              amdgpu_vram_mgr_vis_usage(mgr) >> 20);
  

}

static const struct ttm_resource_manager_func amdgpu_vram_mgr_func = { @@ -692,11 +676,11 @@ int amdgpu_vram_mgr_init(struct amdgpu_device *adev) struct ttm_resource_manager *man = &mgr->manager;

    ttm_resource_manager_init(man, &adev->mman.bdev,

•                             adev->gmc.real_vram_size >> PAGE_SHIFT);
  

•                             adev->gmc.real_vram_size);
  

The kernel-doc for ttm_resource_manager_init() says that size is in page units, should we tweak that to say that it's driver defined or something?

Also amdgpu_bo_validate_size() looks like it is still expecting page units for man->size? Perhaps I'm looking at the wrong tree.

    man->func = &amdgpu_vram_mgr_func;

•   drm_mm_init(&mgr->mm, 0, man->size);
  

•   drm_mm_init(&mgr->mm, 0, man->size >> PAGE_SHIFT);
    spin_lock_init(&mgr->lock);
    INIT_LIST_HEAD(&mgr->reservations_pending);
    INIT_LIST_HEAD(&mgr->reserved_pages);
  

-- 2.25.1