// SPDX-License-Identifier: GPL-2.0 or MIT /* Copyright 2019 Linaro, Ltd, Rob Herring */ /* Copyright 2023 Collabora ltd. */ /* Copyright 2025 Amazon.com, Inc. or its affiliates */ /* Copyright 2025 ARM Limited. All rights reserved. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "panthor_device.h" #include "panthor_drv.h" #include "panthor_fw.h" #include "panthor_gem.h" #include "panthor_mmu.h" void panthor_gem_init(struct panthor_device *ptdev) { int err; if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && !panthor_transparent_hugepage) return; err = drm_gem_huge_mnt_create(&ptdev->base, "within_size"); if (drm_gem_get_huge_mnt(&ptdev->base)) drm_info(&ptdev->base, "Using Transparent Hugepage\n"); else if (err) drm_warn(&ptdev->base, "Can't use Transparent Hugepage (%d)\n", err); } #ifdef CONFIG_DEBUG_FS static void panthor_gem_debugfs_bo_init(struct panthor_gem_object *bo) { INIT_LIST_HEAD(&bo->debugfs.node); } static void panthor_gem_debugfs_bo_add(struct panthor_gem_object *bo) { struct panthor_device *ptdev = container_of(bo->base.dev, struct panthor_device, base); bo->debugfs.creator.tgid = current->tgid; get_task_comm(bo->debugfs.creator.process_name, current->group_leader); mutex_lock(&ptdev->gems.lock); list_add_tail(&bo->debugfs.node, &ptdev->gems.node); mutex_unlock(&ptdev->gems.lock); } static void panthor_gem_debugfs_bo_rm(struct panthor_gem_object *bo) { struct panthor_device *ptdev = container_of(bo->base.dev, struct panthor_device, base); if (list_empty(&bo->debugfs.node)) return; mutex_lock(&ptdev->gems.lock); list_del_init(&bo->debugfs.node); mutex_unlock(&ptdev->gems.lock); } static void panthor_gem_debugfs_set_usage_flags(struct panthor_gem_object *bo, u32 usage_flags) { bo->debugfs.flags = usage_flags; panthor_gem_debugfs_bo_add(bo); } #else static void panthor_gem_debugfs_bo_rm(struct panthor_gem_object *bo) {} static void panthor_gem_debugfs_set_usage_flags(struct panthor_gem_object *bo, u32 usage_flags) {} static void panthor_gem_debugfs_bo_init(struct panthor_gem_object *bo) {} #endif static bool should_map_wc(struct panthor_gem_object *bo) { struct panthor_device *ptdev = container_of(bo->base.dev, struct panthor_device, base); /* We can't do uncached mappings if the device is coherent, * because the zeroing done by the shmem layer at page allocation * time happens on a cached mapping which isn't CPU-flushed (at least * not on Arm64 where the flush is deferred to PTE setup time, and * only done conditionally based on the mapping permissions). We can't * rely on dma_map_sgtable()/dma_sync_sgtable_for_xxx() either to flush * those, because they are NOPed if dma_dev_coherent() returns true. * * FIXME: Note that this problem is going to pop up again when we * decide to support mapping buffers with the NO_MMAP flag as * non-shareable (AKA buffers accessed only by the GPU), because we * need the same CPU flush to happen after page allocation, otherwise * there's a risk of data leak or late corruption caused by a dirty * cacheline being evicted. At this point we'll need a way to force * CPU cache maintenance regardless of whether the device is coherent * or not. */ if (ptdev->coherent) return false; /* Cached mappings are explicitly requested, so no write-combine. */ if (bo->flags & DRM_PANTHOR_BO_WB_MMAP) return false; /* The default is write-combine. */ return true; } static bool is_gpu_mapped(struct panthor_gem_object *bo, enum panthor_gem_reclaim_state *state) { struct drm_gpuvm_bo *vm_bo; u32 vm_count = 0; drm_gem_for_each_gpuvm_bo(vm_bo, &bo->base) { /* Skip evicted GPU mappings. */ if (vm_bo->evicted) continue; if (vm_count++) { *state = PANTHOR_GEM_GPU_MAPPED_MULTI_VM; break; } *state = PANTHOR_GEM_GPU_MAPPED_SINGLE_VM; } return vm_count > 0; } static enum panthor_gem_reclaim_state panthor_gem_evaluate_reclaim_state_locked(struct panthor_gem_object *bo) { enum panthor_gem_reclaim_state gpu_mapped_state; dma_resv_assert_held(bo->base.resv); lockdep_assert_held(&bo->base.gpuva.lock); /* If pages have not been allocated, there's nothing to reclaim. */ if (!bo->backing.pages) return PANTHOR_GEM_UNRECLAIMABLE; /* If memory is pinned, we prevent reclaim. */ if (refcount_read(&bo->backing.pin_count)) return PANTHOR_GEM_UNRECLAIMABLE; if (is_gpu_mapped(bo, &gpu_mapped_state)) return gpu_mapped_state; if (refcount_read(&bo->cmap.mmap_count)) return PANTHOR_GEM_MMAPPED; return PANTHOR_GEM_UNUSED; } void panthor_gem_update_reclaim_state_locked(struct panthor_gem_object *bo, enum panthor_gem_reclaim_state *old_statep) { struct panthor_device *ptdev = container_of(bo->base.dev, struct panthor_device, base); enum panthor_gem_reclaim_state old_state = bo->reclaim_state; enum panthor_gem_reclaim_state new_state; bool was_gpu_mapped, is_gpu_mapped; if (old_statep) *old_statep = old_state; new_state = panthor_gem_evaluate_reclaim_state_locked(bo); if (new_state == old_state) return; was_gpu_mapped = old_state == PANTHOR_GEM_GPU_MAPPED_MULTI_VM || old_state == PANTHOR_GEM_GPU_MAPPED_SINGLE_VM; is_gpu_mapped = new_state == PANTHOR_GEM_GPU_MAPPED_MULTI_VM || new_state == PANTHOR_GEM_GPU_MAPPED_SINGLE_VM; if (is_gpu_mapped && !was_gpu_mapped) ptdev->reclaim.gpu_mapped_count += bo->base.size >> PAGE_SHIFT; else if (!is_gpu_mapped && was_gpu_mapped) ptdev->reclaim.gpu_mapped_count -= bo->base.size >> PAGE_SHIFT; switch (new_state) { case PANTHOR_GEM_UNUSED: drm_gem_lru_move_tail(&ptdev->reclaim.unused, &bo->base); break; case PANTHOR_GEM_MMAPPED: drm_gem_lru_move_tail(&ptdev->reclaim.mmapped, &bo->base); break; case PANTHOR_GEM_GPU_MAPPED_SINGLE_VM: panthor_vm_update_bo_reclaim_lru_locked(bo); break; case PANTHOR_GEM_GPU_MAPPED_MULTI_VM: drm_gem_lru_move_tail(&ptdev->reclaim.gpu_mapped_shared, &bo->base); break; case PANTHOR_GEM_UNRECLAIMABLE: drm_gem_lru_remove(&bo->base); break; default: drm_WARN(&ptdev->base, true, "invalid GEM reclaim state (%d)\n", new_state); break; } bo->reclaim_state = new_state; } static void bo_assert_locked_or_gone(struct panthor_gem_object *bo) { /* If the refcount is zero, the BO is being freed, and we * allow the lock to not be held in that particular case. */ if (kref_read(&bo->base.refcount)) dma_resv_assert_held(bo->base.resv); } static void panthor_gem_backing_cleanup_locked(struct panthor_gem_object *bo) { bo_assert_locked_or_gone(bo); if (!bo->backing.pages) return; drm_gem_put_pages(&bo->base, bo->backing.pages, true, false); bo->backing.pages = NULL; } static int panthor_gem_backing_get_pages_locked(struct panthor_gem_object *bo) { struct page **pages; dma_resv_assert_held(bo->base.resv); if (bo->backing.pages) return 0; pages = drm_gem_get_pages(&bo->base); if (IS_ERR(pages)) { drm_dbg_driver(bo->base.dev, "Failed to get pages (%pe)\n", pages); return PTR_ERR(pages); } bo->backing.pages = pages; return 0; } static int panthor_gem_backing_pin_locked(struct panthor_gem_object *bo) { int ret; dma_resv_assert_held(bo->base.resv); drm_WARN_ON_ONCE(bo->base.dev, drm_gem_is_imported(&bo->base)); if (refcount_inc_not_zero(&bo->backing.pin_count)) return 0; ret = panthor_gem_backing_get_pages_locked(bo); if (!ret) { refcount_set(&bo->backing.pin_count, 1); mutex_lock(&bo->base.gpuva.lock); panthor_gem_update_reclaim_state_locked(bo, NULL); mutex_unlock(&bo->base.gpuva.lock); } return ret; } static void panthor_gem_backing_unpin_locked(struct panthor_gem_object *bo) { bo_assert_locked_or_gone(bo); drm_WARN_ON_ONCE(bo->base.dev, drm_gem_is_imported(&bo->base)); if (refcount_dec_and_test(&bo->backing.pin_count)) { /* We don't release anything when pin_count drops to zero. * Pages stay there until an explicit cleanup is requested. */ mutex_lock(&bo->base.gpuva.lock); panthor_gem_update_reclaim_state_locked(bo, NULL); mutex_unlock(&bo->base.gpuva.lock); } } static void panthor_gem_dev_map_cleanup_locked(struct panthor_gem_object *bo) { bo_assert_locked_or_gone(bo); if (!bo->dmap.sgt) return; dma_unmap_sgtable(drm_dev_dma_dev(bo->base.dev), bo->dmap.sgt, DMA_BIDIRECTIONAL, 0); sg_free_table(bo->dmap.sgt); kfree(bo->dmap.sgt); bo->dmap.sgt = NULL; } static struct sg_table * panthor_gem_dev_map_get_sgt_locked(struct panthor_gem_object *bo) { struct sg_table *sgt; int ret; dma_resv_assert_held(bo->base.resv); if (bo->dmap.sgt) return bo->dmap.sgt; ret = panthor_gem_backing_get_pages_locked(bo); if (ret) return ERR_PTR(ret); sgt = drm_prime_pages_to_sg(bo->base.dev, bo->backing.pages, bo->base.size >> PAGE_SHIFT); if (IS_ERR(sgt)) return sgt; /* Map the pages for use by the h/w. */ ret = dma_map_sgtable(drm_dev_dma_dev(bo->base.dev), sgt, DMA_BIDIRECTIONAL, 0); if (ret) goto err_free_sgt; bo->dmap.sgt = sgt; return sgt; err_free_sgt: sg_free_table(sgt); kfree(sgt); return ERR_PTR(ret); } struct sg_table * panthor_gem_get_dev_sgt(struct panthor_gem_object *bo) { struct sg_table *sgt; dma_resv_lock(bo->base.resv, NULL); sgt = panthor_gem_dev_map_get_sgt_locked(bo); dma_resv_unlock(bo->base.resv); return sgt; } static void panthor_gem_vmap_cleanup_locked(struct panthor_gem_object *bo) { if (!bo->cmap.vaddr) return; vunmap(bo->cmap.vaddr); bo->cmap.vaddr = NULL; panthor_gem_backing_unpin_locked(bo); } static int panthor_gem_prep_for_cpu_map_locked(struct panthor_gem_object *bo) { if (should_map_wc(bo)) { struct sg_table *sgt; sgt = panthor_gem_dev_map_get_sgt_locked(bo); if (IS_ERR(sgt)) return PTR_ERR(sgt); } return 0; } static void * panthor_gem_vmap_get_locked(struct panthor_gem_object *bo) { pgprot_t prot = PAGE_KERNEL; void *vaddr; int ret; dma_resv_assert_held(bo->base.resv); if (drm_WARN_ON_ONCE(bo->base.dev, drm_gem_is_imported(&bo->base))) return ERR_PTR(-EINVAL); if (refcount_inc_not_zero(&bo->cmap.vaddr_use_count)) { drm_WARN_ON_ONCE(bo->base.dev, !bo->cmap.vaddr); return bo->cmap.vaddr; } ret = panthor_gem_backing_pin_locked(bo); if (ret) return ERR_PTR(ret); ret = panthor_gem_prep_for_cpu_map_locked(bo); if (ret) goto err_unpin; if (should_map_wc(bo)) prot = pgprot_writecombine(prot); vaddr = vmap(bo->backing.pages, bo->base.size >> PAGE_SHIFT, VM_MAP, prot); if (!vaddr) { ret = -ENOMEM; goto err_unpin; } bo->cmap.vaddr = vaddr; refcount_set(&bo->cmap.vaddr_use_count, 1); return vaddr; err_unpin: panthor_gem_backing_unpin_locked(bo); return ERR_PTR(ret); } static void panthor_gem_vmap_put_locked(struct panthor_gem_object *bo) { dma_resv_assert_held(bo->base.resv); if (drm_WARN_ON_ONCE(bo->base.dev, drm_gem_is_imported(&bo->base))) return; if (refcount_dec_and_test(&bo->cmap.vaddr_use_count)) panthor_gem_vmap_cleanup_locked(bo); } static void panthor_gem_free_object(struct drm_gem_object *obj) { struct panthor_gem_object *bo = to_panthor_bo(obj); struct drm_gem_object *vm_root_gem = bo->exclusive_vm_root_gem; panthor_gem_debugfs_bo_rm(bo); /* * Label might have been allocated with kstrdup_const(), * we need to take that into account when freeing the memory */ kfree_const(bo->label.str); mutex_destroy(&bo->label.lock); if (drm_gem_is_imported(obj)) { drm_prime_gem_destroy(obj, bo->dmap.sgt); } else { /* The last ref on the GEM object can be released * by the shrinker, which can't block on the resv * lock acquisition. In practice, even if we were * taking the lock, it wouldn't block because we're * the last piece of code having a visibility on * this GEM, but lockdep can't see that, so we've * just tought the _cleanup_locked() helpers about * this "being freed" exception, and we call those * without the lock held here. */ panthor_gem_vmap_cleanup_locked(bo); panthor_gem_dev_map_cleanup_locked(bo); panthor_gem_backing_cleanup_locked(bo); } drm_gem_object_release(obj); kfree(bo); drm_gem_object_put(vm_root_gem); } static struct sg_table * panthor_gem_prime_map_dma_buf(struct dma_buf_attachment *attach, enum dma_data_direction dir) { struct sg_table *sgt = drm_gem_map_dma_buf(attach, dir); if (!IS_ERR(sgt)) attach->priv = sgt; return sgt; } static void panthor_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach, struct sg_table *sgt, enum dma_data_direction dir) { attach->priv = NULL; drm_gem_unmap_dma_buf(attach, sgt, dir); } static int panthor_gem_prime_begin_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction dir) { struct drm_gem_object *obj = dma_buf->priv; struct drm_device *dev = obj->dev; struct panthor_gem_object *bo = to_panthor_bo(obj); struct dma_buf_attachment *attach; dma_resv_lock(obj->resv, NULL); if (bo->dmap.sgt) dma_sync_sgtable_for_cpu(drm_dev_dma_dev(dev), bo->dmap.sgt, dir); if (bo->cmap.vaddr) invalidate_kernel_vmap_range(bo->cmap.vaddr, bo->base.size); list_for_each_entry(attach, &dma_buf->attachments, node) { struct sg_table *sgt = attach->priv; if (sgt) dma_sync_sgtable_for_cpu(attach->dev, sgt, dir); } dma_resv_unlock(obj->resv); return 0; } static int panthor_gem_prime_end_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction dir) { struct drm_gem_object *obj = dma_buf->priv; struct drm_device *dev = obj->dev; struct panthor_gem_object *bo = to_panthor_bo(obj); struct dma_buf_attachment *attach; dma_resv_lock(obj->resv, NULL); list_for_each_entry(attach, &dma_buf->attachments, node) { struct sg_table *sgt = attach->priv; if (sgt) dma_sync_sgtable_for_device(attach->dev, sgt, dir); } if (bo->cmap.vaddr) flush_kernel_vmap_range(bo->cmap.vaddr, bo->base.size); if (bo->dmap.sgt) dma_sync_sgtable_for_device(drm_dev_dma_dev(dev), bo->dmap.sgt, dir); dma_resv_unlock(obj->resv); return 0; } static const struct dma_buf_ops panthor_dma_buf_ops = { .attach = drm_gem_map_attach, .detach = drm_gem_map_detach, .map_dma_buf = panthor_gem_prime_map_dma_buf, .unmap_dma_buf = panthor_gem_prime_unmap_dma_buf, .release = drm_gem_dmabuf_release, .mmap = drm_gem_dmabuf_mmap, .vmap = drm_gem_dmabuf_vmap, .vunmap = drm_gem_dmabuf_vunmap, .begin_cpu_access = panthor_gem_prime_begin_cpu_access, .end_cpu_access = panthor_gem_prime_end_cpu_access, }; static struct dma_buf * panthor_gem_prime_export(struct drm_gem_object *obj, int flags) { struct drm_device *dev = obj->dev; struct dma_buf_export_info exp_info = { .exp_name = KBUILD_MODNAME, .owner = THIS_MODULE, .ops = &panthor_dma_buf_ops, .size = obj->size, .flags = flags, .priv = obj, .resv = obj->resv, }; /* We can't export GEMs that have an exclusive VM. */ if (to_panthor_bo(obj)->exclusive_vm_root_gem) return ERR_PTR(-EINVAL); return drm_gem_dmabuf_export(dev, &exp_info); } struct drm_gem_object * panthor_gem_prime_import(struct drm_device *dev, struct dma_buf *dma_buf) { struct drm_gem_object *obj = dma_buf->priv; if (dma_buf->ops == &panthor_dma_buf_ops && obj->dev == dev) { /* Importing dmabuf exported from our own gem increases * refcount on gem itself instead of f_count of dmabuf. */ drm_gem_object_get(obj); return obj; } return drm_gem_prime_import(dev, dma_buf); } static void panthor_gem_print_info(struct drm_printer *p, unsigned int indent, const struct drm_gem_object *obj) { const struct panthor_gem_object *bo = to_panthor_bo(obj); if (drm_gem_is_imported(&bo->base)) return; drm_printf_indent(p, indent, "resident=%s\n", str_true_false(bo->backing.pages)); drm_printf_indent(p, indent, "pages_pin_count=%u\n", refcount_read(&bo->backing.pin_count)); drm_printf_indent(p, indent, "vmap_use_count=%u\n", refcount_read(&bo->cmap.vaddr_use_count)); drm_printf_indent(p, indent, "vaddr=%p\n", bo->cmap.vaddr); drm_printf_indent(p, indent, "mmap_count=%u\n", refcount_read(&bo->cmap.mmap_count)); } static int panthor_gem_pin_locked(struct drm_gem_object *obj) { if (!drm_gem_is_imported(obj)) return panthor_gem_backing_pin_locked(to_panthor_bo(obj)); return 0; } static void panthor_gem_unpin_locked(struct drm_gem_object *obj) { if (!drm_gem_is_imported(obj)) panthor_gem_backing_unpin_locked(to_panthor_bo(obj)); } int panthor_gem_pin(struct panthor_gem_object *bo) { int ret = 0; if (drm_gem_is_imported(&bo->base)) return 0; if (refcount_inc_not_zero(&bo->backing.pin_count)) return 0; dma_resv_lock(bo->base.resv, NULL); ret = panthor_gem_backing_pin_locked(bo); dma_resv_unlock(bo->base.resv); return ret; } void panthor_gem_unpin(struct panthor_gem_object *bo) { if (drm_gem_is_imported(&bo->base)) return; if (refcount_dec_not_one(&bo->backing.pin_count)) return; dma_resv_lock(bo->base.resv, NULL); panthor_gem_backing_unpin_locked(bo); dma_resv_unlock(bo->base.resv); } int panthor_gem_swapin_locked(struct panthor_gem_object *bo) { struct sg_table *sgt; dma_resv_assert_held(bo->base.resv); if (drm_WARN_ON_ONCE(bo->base.dev, drm_gem_is_imported(&bo->base))) return -EINVAL; sgt = panthor_gem_dev_map_get_sgt_locked(bo); if (IS_ERR(sgt)) return PTR_ERR(sgt); return 0; } static void panthor_gem_evict_locked(struct panthor_gem_object *bo) { dma_resv_assert_held(bo->base.resv); lockdep_assert_held(&bo->base.gpuva.lock); if (drm_WARN_ON_ONCE(bo->base.dev, drm_gem_is_imported(&bo->base))) return; if (drm_WARN_ON_ONCE(bo->base.dev, refcount_read(&bo->backing.pin_count))) return; if (drm_WARN_ON_ONCE(bo->base.dev, !bo->backing.pages)) return; atomic_add_unless(&bo->reclaimed_count, 1, INT_MAX); panthor_gem_dev_map_cleanup_locked(bo); panthor_gem_backing_cleanup_locked(bo); panthor_gem_update_reclaim_state_locked(bo, NULL); } static struct sg_table *panthor_gem_get_sg_table(struct drm_gem_object *obj) { struct panthor_gem_object *bo = to_panthor_bo(obj); drm_WARN_ON_ONCE(obj->dev, drm_gem_is_imported(obj)); drm_WARN_ON_ONCE(obj->dev, !bo->backing.pages); drm_WARN_ON_ONCE(obj->dev, !refcount_read(&bo->backing.pin_count)); return drm_prime_pages_to_sg(obj->dev, bo->backing.pages, obj->size >> PAGE_SHIFT); } static int panthor_gem_vmap_locked(struct drm_gem_object *obj, struct iosys_map *map) { struct panthor_gem_object *bo = to_panthor_bo(obj); void *vaddr; dma_resv_assert_held(obj->resv); if (drm_gem_is_imported(obj)) return dma_buf_vmap(obj->import_attach->dmabuf, map); vaddr = panthor_gem_vmap_get_locked(bo); if (IS_ERR(vaddr)) return PTR_ERR(vaddr); iosys_map_set_vaddr(map, vaddr); return 0; } static void panthor_gem_vunmap_locked(struct drm_gem_object *obj, struct iosys_map *map) { struct panthor_gem_object *bo = to_panthor_bo(obj); dma_resv_assert_held(obj->resv); if (drm_gem_is_imported(obj)) { dma_buf_vunmap(obj->import_attach->dmabuf, map); } else { drm_WARN_ON_ONCE(obj->dev, bo->cmap.vaddr != map->vaddr); panthor_gem_vmap_put_locked(bo); } } static int panthor_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma) { struct panthor_gem_object *bo = to_panthor_bo(obj); int ret; if (drm_gem_is_imported(obj)) { /* Reset both vm_ops and vm_private_data, so we don't end up with * vm_ops pointing to our implementation if the dma-buf backend * doesn't set those fields. */ vma->vm_private_data = NULL; vma->vm_ops = NULL; ret = dma_buf_mmap(obj->dma_buf, vma, 0); /* Drop the reference drm_gem_mmap_obj() acquired.*/ if (!ret) drm_gem_object_put(obj); return ret; } if (is_cow_mapping(vma->vm_flags)) return -EINVAL; if (!refcount_inc_not_zero(&bo->cmap.mmap_count)) { dma_resv_lock(obj->resv, NULL); if (!refcount_inc_not_zero(&bo->cmap.mmap_count)) { refcount_set(&bo->cmap.mmap_count, 1); mutex_lock(&bo->base.gpuva.lock); panthor_gem_update_reclaim_state_locked(bo, NULL); mutex_unlock(&bo->base.gpuva.lock); } dma_resv_unlock(obj->resv); } vm_flags_set(vma, VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP); vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); if (should_map_wc(bo)) vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); return 0; } static enum drm_gem_object_status panthor_gem_status(struct drm_gem_object *obj) { struct panthor_gem_object *bo = to_panthor_bo(obj); enum drm_gem_object_status res = 0; if (drm_gem_is_imported(&bo->base) || bo->backing.pages) res |= DRM_GEM_OBJECT_RESIDENT; return res; } static vm_fault_t insert_page(struct vm_fault *vmf, unsigned int order, struct page *page) { if (!order) { return vmf_insert_pfn(vmf->vma, vmf->address, page_to_pfn(page)); #ifdef CONFIG_ARCH_SUPPORTS_PMD_PFNMAP } else if (order == PMD_ORDER) { unsigned long pfn = page_to_pfn(page); unsigned long paddr = pfn << PAGE_SHIFT; bool aligned = (vmf->address & ~PMD_MASK) == (paddr & ~PMD_MASK); if (aligned && folio_test_pmd_mappable(page_folio(page))) { pfn &= PMD_MASK >> PAGE_SHIFT; return vmf_insert_pfn_pmd(vmf, pfn, vmf->flags & FAULT_FLAG_WRITE); } #endif } return VM_FAULT_FALLBACK; } static vm_fault_t nonblocking_page_setup(struct vm_fault *vmf, unsigned int order, pgoff_t page_offset) { struct vm_area_struct *vma = vmf->vma; struct panthor_gem_object *bo = to_panthor_bo(vma->vm_private_data); vm_fault_t ret; if (!dma_resv_trylock(bo->base.resv)) return VM_FAULT_RETRY; if (bo->backing.pages) ret = insert_page(vmf, order, bo->backing.pages[page_offset]); else ret = VM_FAULT_RETRY; dma_resv_unlock(bo->base.resv); return ret; } static vm_fault_t blocking_page_setup(struct vm_fault *vmf, unsigned int order, struct panthor_gem_object *bo, pgoff_t page_offset, bool mmap_lock_held) { vm_fault_t ret; int err; err = dma_resv_lock_interruptible(bo->base.resv, NULL); if (err) return mmap_lock_held ? VM_FAULT_NOPAGE : VM_FAULT_RETRY; err = panthor_gem_backing_get_pages_locked(bo); if (!err) err = panthor_gem_prep_for_cpu_map_locked(bo); if (err) { ret = mmap_lock_held ? VM_FAULT_SIGBUS : VM_FAULT_RETRY; } else { struct page *page = bo->backing.pages[page_offset]; mutex_lock(&bo->base.gpuva.lock); panthor_gem_update_reclaim_state_locked(bo, NULL); mutex_unlock(&bo->base.gpuva.lock); if (mmap_lock_held) ret = insert_page(vmf, order, page); else ret = VM_FAULT_RETRY; } dma_resv_unlock(bo->base.resv); return ret; } static vm_fault_t panthor_gem_any_fault(struct vm_fault *vmf, unsigned int order) { struct vm_area_struct *vma = vmf->vma; struct panthor_gem_object *bo = to_panthor_bo(vma->vm_private_data); loff_t num_pages = bo->base.size >> PAGE_SHIFT; pgoff_t page_offset; vm_fault_t ret; if (order && order != PMD_ORDER) return VM_FAULT_FALLBACK; /* Offset to faulty address in the VMA. */ page_offset = vmf->pgoff - vma->vm_pgoff; if (page_offset >= num_pages) return VM_FAULT_SIGBUS; ret = nonblocking_page_setup(vmf, order, page_offset); if (ret != VM_FAULT_RETRY) return ret; /* Check if we're allowed to retry. */ if (fault_flag_allow_retry_first(vmf->flags)) { /* If we're allowed to retry but not wait here, return * immediately, the wait will be done when the fault * handler is called again, with the mmap_lock held. */ if (vmf->flags & FAULT_FLAG_RETRY_NOWAIT) return VM_FAULT_RETRY; /* Wait with the mmap lock released, if we're allowed to. */ drm_gem_object_get(&bo->base); if (vmf->flags & FAULT_FLAG_VMA_LOCK) vma_end_read(vmf->vma); else mmap_read_unlock(vmf->vma->vm_mm); ret = blocking_page_setup(vmf, order, bo, page_offset, false); drm_gem_object_put(&bo->base); return ret; } return blocking_page_setup(vmf, order, bo, page_offset, true); } static vm_fault_t panthor_gem_fault(struct vm_fault *vmf) { return panthor_gem_any_fault(vmf, 0); } static void panthor_gem_vm_open(struct vm_area_struct *vma) { struct panthor_gem_object *bo = to_panthor_bo(vma->vm_private_data); drm_WARN_ON(bo->base.dev, drm_gem_is_imported(&bo->base)); drm_WARN_ON(bo->base.dev, !refcount_inc_not_zero(&bo->cmap.mmap_count)); drm_gem_vm_open(vma); } static void panthor_gem_vm_close(struct vm_area_struct *vma) { struct panthor_gem_object *bo = to_panthor_bo(vma->vm_private_data); if (drm_gem_is_imported(&bo->base)) goto out; if (refcount_dec_not_one(&bo->cmap.mmap_count)) goto out; dma_resv_lock(bo->base.resv, NULL); if (refcount_dec_and_test(&bo->cmap.mmap_count)) { mutex_lock(&bo->base.gpuva.lock); panthor_gem_update_reclaim_state_locked(bo, NULL); mutex_unlock(&bo->base.gpuva.lock); } dma_resv_unlock(bo->base.resv); out: drm_gem_object_put(&bo->base); } static const struct vm_operations_struct panthor_gem_vm_ops = { .fault = panthor_gem_fault, #ifdef CONFIG_ARCH_SUPPORTS_PMD_PFNMAP .huge_fault = panthor_gem_any_fault, #endif .open = panthor_gem_vm_open, .close = panthor_gem_vm_close, }; static const struct drm_gem_object_funcs panthor_gem_funcs = { .free = panthor_gem_free_object, .print_info = panthor_gem_print_info, .pin = panthor_gem_pin_locked, .unpin = panthor_gem_unpin_locked, .get_sg_table = panthor_gem_get_sg_table, .vmap = panthor_gem_vmap_locked, .vunmap = panthor_gem_vunmap_locked, .mmap = panthor_gem_mmap, .status = panthor_gem_status, .export = panthor_gem_prime_export, .vm_ops = &panthor_gem_vm_ops, }; static struct panthor_gem_object * panthor_gem_alloc_object(u32 flags) { struct panthor_gem_object *bo; bo = kzalloc_obj(*bo); if (!bo) return ERR_PTR(-ENOMEM); bo->reclaim_state = PANTHOR_GEM_UNRECLAIMABLE; bo->base.funcs = &panthor_gem_funcs; bo->flags = flags; mutex_init(&bo->label.lock); panthor_gem_debugfs_bo_init(bo); return bo; } static struct panthor_gem_object * panthor_gem_create(struct drm_device *dev, size_t size, uint32_t flags, struct panthor_vm *exclusive_vm, u32 usage_flags) { struct panthor_gem_object *bo; int ret; bo = panthor_gem_alloc_object(flags); if (IS_ERR(bo)) return bo; size = PAGE_ALIGN(size); ret = drm_gem_object_init(dev, &bo->base, size); if (ret) goto err_put; /* Our buffers are kept pinned, so allocating them * from the MOVABLE zone is a really bad idea, and * conflicts with CMA. See comments above new_inode() * why this is required _and_ expected if you're * going to pin these pages. */ mapping_set_gfp_mask(bo->base.filp->f_mapping, GFP_HIGHUSER | __GFP_RETRY_MAYFAIL | __GFP_NOWARN); ret = drm_gem_create_mmap_offset(&bo->base); if (ret) goto err_put; if (exclusive_vm) { bo->exclusive_vm_root_gem = panthor_vm_root_gem(exclusive_vm); drm_gem_object_get(bo->exclusive_vm_root_gem); bo->base.resv = bo->exclusive_vm_root_gem->resv; } panthor_gem_debugfs_set_usage_flags(bo, usage_flags); return bo; err_put: drm_gem_object_put(&bo->base); return ERR_PTR(ret); } struct drm_gem_object * panthor_gem_prime_import_sg_table(struct drm_device *dev, struct dma_buf_attachment *attach, struct sg_table *sgt) { struct panthor_gem_object *bo; int ret; bo = panthor_gem_alloc_object(0); if (IS_ERR(bo)) return ERR_CAST(bo); drm_gem_private_object_init(dev, &bo->base, attach->dmabuf->size); ret = drm_gem_create_mmap_offset(&bo->base); if (ret) goto err_put; bo->dmap.sgt = sgt; return &bo->base; err_put: drm_gem_object_put(&bo->base); return ERR_PTR(ret); } /** * panthor_gem_create_with_handle() - Create a GEM object and attach it to a handle. * @file: DRM file. * @ddev: DRM device. * @exclusive_vm: Exclusive VM. Not NULL if the GEM object can't be shared. * @size: Size of the GEM object to allocate. * @flags: Combination of drm_panthor_bo_flags flags. * @handle: Pointer holding the handle pointing to the new GEM object. * * Return: Zero on success */ int panthor_gem_create_with_handle(struct drm_file *file, struct drm_device *ddev, struct panthor_vm *exclusive_vm, u64 *size, u32 flags, u32 *handle) { int ret; struct panthor_gem_object *bo; bo = panthor_gem_create(ddev, *size, flags, exclusive_vm, 0); if (IS_ERR(bo)) return PTR_ERR(bo); /* * Allocate an id of idr table where the obj is registered * and handle has the id what user can see. */ ret = drm_gem_handle_create(file, &bo->base, handle); if (!ret) *size = bo->base.size; /* drop reference from allocate - handle holds it now. */ drm_gem_object_put(&bo->base); return ret; } void panthor_gem_bo_set_label(struct drm_gem_object *obj, const char *label) { struct panthor_gem_object *bo = to_panthor_bo(obj); const char *old_label; scoped_guard(mutex, &bo->label.lock) { old_label = bo->label.str; bo->label.str = label; } kfree_const(old_label); } void panthor_gem_kernel_bo_set_label(struct panthor_kernel_bo *bo, const char *label) { const char *str; /* We should never attempt labelling a UM-exposed GEM object */ if (drm_WARN_ON(bo->obj->dev, bo->obj->handle_count > 0)) return; if (!label) return; str = kstrdup_const(label, GFP_KERNEL); if (!str) { /* Failing to allocate memory for a label isn't a fatal condition */ drm_warn(bo->obj->dev, "Not enough memory to allocate BO label"); return; } panthor_gem_bo_set_label(bo->obj, str); } int panthor_gem_sync(struct drm_gem_object *obj, u32 type, u64 offset, u64 size) { struct panthor_gem_object *bo = to_panthor_bo(obj); struct device *dma_dev = drm_dev_dma_dev(bo->base.dev); struct sg_table *sgt; struct scatterlist *sgl; unsigned int count; int ret; /* Make sure the range is in bounds. */ if (offset + size < offset || offset + size > bo->base.size) return -EINVAL; /* Disallow CPU-cache maintenance on imported buffers. */ if (drm_gem_is_imported(&bo->base)) return -EINVAL; switch (type) { case DRM_PANTHOR_BO_SYNC_CPU_CACHE_FLUSH: case DRM_PANTHOR_BO_SYNC_CPU_CACHE_FLUSH_AND_INVALIDATE: break; default: return -EINVAL; } /* Don't bother if it's WC-mapped */ if (should_map_wc(bo)) return 0; /* Nothing to do if the size is zero. */ if (size == 0) return 0; ret = dma_resv_lock_interruptible(bo->base.resv, NULL); if (ret) return ret; /* If there's no pages, there's no point pulling those back, bail out early. */ if (!bo->backing.pages) { ret = 0; goto out_unlock; } sgt = panthor_gem_dev_map_get_sgt_locked(bo); if (IS_ERR(sgt)) { ret = PTR_ERR(sgt); goto out_unlock; } for_each_sgtable_dma_sg(sgt, sgl, count) { if (size == 0) break; dma_addr_t paddr = sg_dma_address(sgl); size_t len = sg_dma_len(sgl); if (len <= offset) { offset -= len; continue; } paddr += offset; len -= offset; len = min_t(size_t, len, size); size -= len; offset = 0; /* It's unclear whether dma_sync_xxx() is the right API to do CPU * cache maintenance given an IOMMU can register their own * implementation doing more than just CPU cache flushes/invalidation, * and what we really care about here is CPU caches only, but that's * the best we have that is both arch-agnostic and does at least the * CPU cache maintenance on a tuple. * * Also, I wish we could do a single * * dma_sync_single_for_device(BIDIR) * * and get a flush+invalidate, but that's not how it's implemented * in practice (at least on arm64), so we have to make it * * dma_sync_single_for_device(TO_DEVICE) * dma_sync_single_for_cpu(FROM_DEVICE) * * for the flush+invalidate case. */ dma_sync_single_for_device(dma_dev, paddr, len, DMA_TO_DEVICE); if (type == DRM_PANTHOR_BO_SYNC_CPU_CACHE_FLUSH_AND_INVALIDATE) dma_sync_single_for_cpu(dma_dev, paddr, len, DMA_FROM_DEVICE); } ret = 0; out_unlock: dma_resv_unlock(bo->base.resv); return ret; } /** * panthor_kernel_bo_destroy() - Destroy a kernel buffer object * @bo: Kernel buffer object to destroy. If NULL or an ERR_PTR(), the destruction * is skipped. */ void panthor_kernel_bo_destroy(struct panthor_kernel_bo *bo) { struct panthor_device *ptdev; struct panthor_vm *vm; if (IS_ERR_OR_NULL(bo)) return; ptdev = container_of(bo->obj->dev, struct panthor_device, base); vm = bo->vm; panthor_kernel_bo_vunmap(bo); drm_WARN_ON(bo->obj->dev, to_panthor_bo(bo->obj)->exclusive_vm_root_gem != panthor_vm_root_gem(vm)); panthor_vm_unmap_range(vm, bo->va_node.start, bo->va_node.size); panthor_vm_free_va(vm, &bo->va_node); if (vm == panthor_fw_vm(ptdev)) panthor_gem_unpin(to_panthor_bo(bo->obj)); drm_gem_object_put(bo->obj); panthor_vm_put(vm); kfree(bo); } /** * panthor_kernel_bo_create() - Create and map a GEM object to a VM * @ptdev: Device. * @vm: VM to map the GEM to. * @size: Size of the buffer object. * @bo_flags: Combination of drm_panthor_bo_flags flags. * @vm_map_flags: Combination of drm_panthor_vm_bind_op_flags (only those * that are related to map operations). * @gpu_va: GPU address assigned when mapping to the VM. * If gpu_va == PANTHOR_VM_KERNEL_AUTO_VA, the virtual address will be * automatically allocated. * @name: Descriptive label of the BO's contents * * Return: A valid pointer in case of success, an ERR_PTR() otherwise. */ struct panthor_kernel_bo * panthor_kernel_bo_create(struct panthor_device *ptdev, struct panthor_vm *vm, size_t size, u32 bo_flags, u32 vm_map_flags, u64 gpu_va, const char *name) { struct panthor_kernel_bo *kbo; struct panthor_gem_object *bo; u32 debug_flags = PANTHOR_DEBUGFS_GEM_USAGE_FLAG_KERNEL; int ret; if (drm_WARN_ON(&ptdev->base, !vm)) return ERR_PTR(-EINVAL); kbo = kzalloc_obj(*kbo); if (!kbo) return ERR_PTR(-ENOMEM); if (vm == panthor_fw_vm(ptdev)) debug_flags |= PANTHOR_DEBUGFS_GEM_USAGE_FLAG_FW_MAPPED; bo = panthor_gem_create(&ptdev->base, size, bo_flags, vm, debug_flags); if (IS_ERR(bo)) { ret = PTR_ERR(bo); goto err_free_kbo; } kbo->obj = &bo->base; if (vm == panthor_fw_vm(ptdev)) { ret = panthor_gem_pin(bo); if (ret) goto err_put_obj; } panthor_gem_kernel_bo_set_label(kbo, name); /* The system and GPU MMU page size might differ, which becomes a * problem for FW sections that need to be mapped at explicit address * since our PAGE_SIZE alignment might cover a VA range that's * expected to be used for another section. * Make sure we never map more than we need. */ size = ALIGN(size, panthor_vm_page_size(vm)); ret = panthor_vm_alloc_va(vm, gpu_va, size, &kbo->va_node); if (ret) goto err_unpin; ret = panthor_vm_map_bo_range(vm, bo, 0, size, kbo->va_node.start, vm_map_flags); if (ret) goto err_free_va; kbo->vm = panthor_vm_get(vm); return kbo; err_free_va: panthor_vm_free_va(vm, &kbo->va_node); err_unpin: if (vm == panthor_fw_vm(ptdev)) panthor_gem_unpin(bo); err_put_obj: drm_gem_object_put(&bo->base); err_free_kbo: kfree(kbo); return ERR_PTR(ret); } static bool can_swap(void) { return get_nr_swap_pages() > 0; } static bool can_block(struct shrink_control *sc) { /* If direct reclaim is allowed, we can always block. * If kswapd reclaim is allowed, we can block, but only if we're called * by the kswapd thread. */ return (sc->gfp_mask & __GFP_DIRECT_RECLAIM) || ((sc->gfp_mask & __GFP_KSWAPD_RECLAIM) && current_is_kswapd()); } static unsigned long panthor_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc) { struct panthor_device *ptdev = shrinker->private_data; unsigned long count; /* We currently don't have a flag to tell when the content of a * BO can be discarded. */ if (!can_swap()) return 0; /* This is racy, but that's okay because the returned count is just a * hint. That's also what MSM is doing (no atomic var, it's relying on * the fact unsigned long access is usually atomic), so if it's good * enough for them, it's good enough for us too. */ count = ptdev->reclaim.unused.count; count += ptdev->reclaim.mmapped.count; if (can_block(sc)) count += ptdev->reclaim.gpu_mapped_count; return count ? count : SHRINK_EMPTY; } static bool panthor_gem_try_evict_no_resv_wait(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket) { /* * Track last locked entry for unwinding locks in error and * success paths */ struct panthor_gem_object *bo = to_panthor_bo(obj); struct drm_gpuvm_bo *vm_bo, *last_locked = NULL; enum panthor_gem_reclaim_state old_state; int ret = 0; /* To avoid potential lock ordering issue between bo_gpuva and * mapping->i_mmap_rwsem, unmap the pages from CPU side before * acquring the bo_gpuva lock. As the bo_resv lock is held, CPU * page fault handler won't be able to map in the pages whilst * eviction is in progress. */ drm_vma_node_unmap(&bo->base.vma_node, bo->base.dev->anon_inode->i_mapping); /* We take this lock when walking the list to prevent * insertion/deletion. */ /* We can only trylock in that path, because * - allocation might happen while some of these locks are held * - lock ordering is different in other paths * vm_resv -> bo_resv -> bo_gpuva * vs * bo_resv -> bo_gpuva -> vm_resv * * If we fail to lock that's fine, we back off and will get * back to it later. */ if (!mutex_trylock(&bo->base.gpuva.lock)) return false; drm_gem_for_each_gpuvm_bo(vm_bo, obj) { struct dma_resv *resv = drm_gpuvm_resv(vm_bo->vm); if (resv == obj->resv) continue; if (!dma_resv_trylock(resv)) { ret = -EDEADLK; goto out_unlock; } last_locked = vm_bo; } /* Update the state before trying to evict the buffer, if the state was * updated to something that's harder to reclaim (higher value in the * enum), skip it (will be processed when the relevant LRU is). */ panthor_gem_update_reclaim_state_locked(bo, &old_state); if (old_state < bo->reclaim_state) { ret = -EAGAIN; goto out_unlock; } /* Couldn't teardown the GPU mappings? Skip. */ ret = panthor_vm_evict_bo_mappings_locked(bo); if (ret) goto out_unlock; /* If everything went fine, evict the object. */ panthor_gem_evict_locked(bo); out_unlock: if (last_locked) { drm_gem_for_each_gpuvm_bo(vm_bo, obj) { struct dma_resv *resv = drm_gpuvm_resv(vm_bo->vm); if (resv == obj->resv) continue; dma_resv_unlock(resv); if (last_locked == vm_bo) break; } } mutex_unlock(&bo->base.gpuva.lock); return ret == 0; } static bool panthor_gem_try_evict(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket) { struct panthor_gem_object *bo = to_panthor_bo(obj); /* Wait was too long, skip. */ if (dma_resv_wait_timeout(obj->resv, DMA_RESV_USAGE_BOOKKEEP, false, 10) <= 0) return false; return panthor_gem_try_evict_no_resv_wait(&bo->base, ticket); } static unsigned long panthor_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc) { struct panthor_device *ptdev = shrinker->private_data; unsigned long remaining = 0; unsigned long freed = 0; if (!can_swap()) goto out; freed += drm_gem_lru_scan(&ptdev->base, &ptdev->reclaim.unused, sc->nr_to_scan - freed, &remaining, panthor_gem_try_evict_no_resv_wait, NULL); if (freed >= sc->nr_to_scan) goto out; freed += drm_gem_lru_scan(&ptdev->base, &ptdev->reclaim.mmapped, sc->nr_to_scan - freed, &remaining, panthor_gem_try_evict_no_resv_wait, NULL); if (freed >= sc->nr_to_scan) goto out; if (!can_block(sc)) goto out; freed += panthor_mmu_reclaim_priv_bos(ptdev, sc->nr_to_scan - freed, &remaining, panthor_gem_try_evict); if (freed >= sc->nr_to_scan) goto out; freed += drm_gem_lru_scan(&ptdev->base, &ptdev->reclaim.gpu_mapped_shared, sc->nr_to_scan - freed, &remaining, panthor_gem_try_evict, NULL); out: #ifdef CONFIG_DEBUG_FS /* This is racy, but that's okay, because this is just debugfs * reporting and doesn't need to be accurate. */ ptdev->reclaim.nr_pages_reclaimed_on_last_scan = freed; #endif /* If there are things to reclaim, try a couple times before giving up. */ if (!freed && remaining > 0 && atomic_inc_return(&ptdev->reclaim.retry_count) < 2) return 0; atomic_set(&ptdev->reclaim.retry_count, 0); if (freed) return freed; /* There's nothing left to reclaim, or the resources are contended. Give up now. */ return SHRINK_STOP; } int panthor_gem_shrinker_init(struct panthor_device *ptdev) { struct shrinker *shrinker; INIT_LIST_HEAD(&ptdev->reclaim.vms); drm_gem_lru_init(&ptdev->reclaim.unused); drm_gem_lru_init(&ptdev->reclaim.mmapped); drm_gem_lru_init(&ptdev->reclaim.gpu_mapped_shared); ptdev->reclaim.gpu_mapped_count = 0; /* Teach lockdep about lock ordering wrt. shrinker: */ fs_reclaim_acquire(GFP_KERNEL); might_lock(&ptdev->base.gem_lru_mutex); fs_reclaim_release(GFP_KERNEL); shrinker = shrinker_alloc(0, "drm-panthor-gem"); if (!shrinker) return -ENOMEM; shrinker->count_objects = panthor_gem_shrinker_count; shrinker->scan_objects = panthor_gem_shrinker_scan; shrinker->private_data = ptdev; ptdev->reclaim.shrinker = shrinker; shrinker_register(shrinker); return 0; } void panthor_gem_shrinker_unplug(struct panthor_device *ptdev) { if (ptdev->reclaim.shrinker) shrinker_free(ptdev->reclaim.shrinker); } #ifdef CONFIG_DEBUG_FS struct gem_size_totals { size_t size; size_t resident; size_t reclaimable; }; static void panthor_gem_debugfs_print_flag_names(struct seq_file *m) { int len; int i; static const char * const gem_state_flags_names[] = { [PANTHOR_DEBUGFS_GEM_STATE_IMPORTED_BIT] = "imported", [PANTHOR_DEBUGFS_GEM_STATE_EXPORTED_BIT] = "exported", [PANTHOR_DEBUGFS_GEM_STATE_EVICTED_BIT] = "evicted", }; static const char * const gem_usage_flags_names[] = { [PANTHOR_DEBUGFS_GEM_USAGE_KERNEL_BIT] = "kernel", [PANTHOR_DEBUGFS_GEM_USAGE_FW_MAPPED_BIT] = "fw-mapped", }; seq_puts(m, "GEM state flags: "); for (i = 0, len = ARRAY_SIZE(gem_state_flags_names); i < len; i++) { if (!gem_state_flags_names[i]) continue; seq_printf(m, "%s (0x%x)%s", gem_state_flags_names[i], (u32)BIT(i), (i < len - 1) ? ", " : "\n"); } seq_puts(m, "GEM usage flags: "); for (i = 0, len = ARRAY_SIZE(gem_usage_flags_names); i < len; i++) { if (!gem_usage_flags_names[i]) continue; seq_printf(m, "%s (0x%x)%s", gem_usage_flags_names[i], (u32)BIT(i), (i < len - 1) ? ", " : "\n\n"); } } static void panthor_gem_debugfs_bo_print(struct panthor_gem_object *bo, struct seq_file *m, struct gem_size_totals *totals) { enum panthor_gem_reclaim_state reclaim_state = bo->reclaim_state; unsigned int refcount = kref_read(&bo->base.refcount); int reclaimed_count = atomic_read(&bo->reclaimed_count); char creator_info[32] = {}; size_t resident_size; u32 gem_usage_flags = bo->debugfs.flags; u32 gem_state_flags = 0; /* Skip BOs being destroyed. */ if (!refcount) return; resident_size = bo->backing.pages ? bo->base.size : 0; snprintf(creator_info, sizeof(creator_info), "%s/%d", bo->debugfs.creator.process_name, bo->debugfs.creator.tgid); seq_printf(m, "%-32s%-16d%-11d%-11d%-16zd%-16zd0x%-16lx", creator_info, bo->base.name, refcount, reclaimed_count, bo->base.size, resident_size, drm_vma_node_start(&bo->base.vma_node)); if (drm_gem_is_imported(&bo->base)) gem_state_flags |= PANTHOR_DEBUGFS_GEM_STATE_FLAG_IMPORTED; else if (!resident_size && reclaimed_count) gem_state_flags |= PANTHOR_DEBUGFS_GEM_STATE_FLAG_EVICTED; if (bo->base.dma_buf) gem_state_flags |= PANTHOR_DEBUGFS_GEM_STATE_FLAG_EXPORTED; seq_printf(m, "0x%-8x 0x%-10x", gem_state_flags, gem_usage_flags); scoped_guard(mutex, &bo->label.lock) { seq_printf(m, "%s\n", bo->label.str ? : ""); } totals->size += bo->base.size; totals->resident += resident_size; if (reclaim_state != PANTHOR_GEM_UNRECLAIMABLE) totals->reclaimable += resident_size; } static void panthor_gem_debugfs_print_bos(struct panthor_device *ptdev, struct seq_file *m) { struct gem_size_totals totals = {0}; struct panthor_gem_object *bo; panthor_gem_debugfs_print_flag_names(m); seq_puts(m, "created-by global-name refcount evictions size resident-size file-offset state usage label\n"); seq_puts(m, "----------------------------------------------------------------------------------------------------------------------------------------------------\n"); scoped_guard(mutex, &ptdev->gems.lock) { list_for_each_entry(bo, &ptdev->gems.node, debugfs.node) { panthor_gem_debugfs_bo_print(bo, m, &totals); } } seq_puts(m, "====================================================================================================================================================\n"); seq_printf(m, "Total size: %zd, Total resident: %zd, Total reclaimable: %zd\n", totals.size, totals.resident, totals.reclaimable); } static int panthor_gem_show_bos(struct seq_file *m, void *data) { struct drm_info_node *node = m->private; struct drm_device *dev = node->minor->dev; struct panthor_device *ptdev = container_of(dev, struct panthor_device, base); panthor_gem_debugfs_print_bos(ptdev, m); return 0; } static struct drm_info_list panthor_gem_debugfs_list[] = { { "gems", panthor_gem_show_bos, 0, NULL }, }; static int shrink_get(void *data, u64 *val) { struct panthor_device *ptdev = container_of(data, struct panthor_device, base); *val = ptdev->reclaim.nr_pages_reclaimed_on_last_scan; return 0; } static int shrink_set(void *data, u64 val) { struct panthor_device *ptdev = container_of(data, struct panthor_device, base); struct shrink_control sc = { .gfp_mask = GFP_KERNEL, .nr_to_scan = val, }; fs_reclaim_acquire(GFP_KERNEL); if (ptdev->reclaim.shrinker) panthor_gem_shrinker_scan(ptdev->reclaim.shrinker, &sc); fs_reclaim_release(GFP_KERNEL); return 0; } DEFINE_DEBUGFS_ATTRIBUTE(panthor_gem_debugfs_shrink_fops, shrink_get, shrink_set, "0x%08llx\n"); void panthor_gem_debugfs_init(struct drm_minor *minor) { drm_debugfs_create_files(panthor_gem_debugfs_list, ARRAY_SIZE(panthor_gem_debugfs_list), minor->debugfs_root, minor); debugfs_create_file("shrink", 0600, minor->debugfs_root, minor->dev, &panthor_gem_debugfs_shrink_fops); } #endif