// SPDX-License-Identifier: GPL-2.0 or MIT
/* Copyright 2019 Linaro, Ltd, Rob Herring <robh@kernel.org> */
/* Copyright 2023 Collabora ltd. */
/* Copyright 2025 Amazon.com, Inc. or its affiliates */

#include <linux/cleanup.h>
#include <linux/dma-buf.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/slab.h>

#include <drm/drm_print.h>
#include <drm/panthor_drm.h>

#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.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.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_vm *exclusive_vm)
{
        struct panthor_device *ptdev = container_of(bo->base.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 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);

        drm_gem_free_mmap_offset(&bo->base.base);
        drm_gem_shmem_free(&bo->base);
        drm_gem_object_put(vm_root_gem);
}

/**
 * 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_vm *vm;

        if (IS_ERR_OR_NULL(bo))
                return;

        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);
        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. If NULL, the kernel object is not GPU mapped.
 * @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 drm_gem_shmem_object *obj;
        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);

        obj = drm_gem_shmem_create(&ptdev->base, size);
        if (IS_ERR(obj)) {
                ret = PTR_ERR(obj);
                goto err_free_bo;
        }

        bo = to_panthor_bo(&obj->base);
        kbo->obj = &obj->base;
        bo->flags = bo_flags;
        bo->base.map_wc = should_map_wc(bo, vm);
        bo->exclusive_vm_root_gem = panthor_vm_root_gem(vm);
        drm_gem_object_get(bo->exclusive_vm_root_gem);
        bo->base.base.resv = bo->exclusive_vm_root_gem->resv;

        if (vm == panthor_fw_vm(ptdev))
                debug_flags |= PANTHOR_DEBUGFS_GEM_USAGE_FLAG_FW_MAPPED;

        panthor_gem_kernel_bo_set_label(kbo, name);
        panthor_gem_debugfs_set_usage_flags(to_panthor_bo(kbo->obj), debug_flags);

        /* 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_put_obj;

        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_put_obj:
        drm_gem_object_put(&obj->base);

err_free_bo:
        kfree(kbo);
        return ERR_PTR(ret);
}

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 drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
        struct dma_buf_attachment *attach;

        dma_resv_lock(obj->resv, NULL);
        if (shmem->sgt)
                dma_sync_sgtable_for_cpu(dev->dev, shmem->sgt, dir);

        if (shmem->vaddr)
                invalidate_kernel_vmap_range(shmem->vaddr, shmem->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 drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(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 (shmem->vaddr)
                flush_kernel_vmap_range(shmem->vaddr, shmem->base.size);

        if (shmem->sgt)
                dma_sync_sgtable_for_device(dev->dev, shmem->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 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.base) || bo->base.pages)
                res |= DRM_GEM_OBJECT_RESIDENT;

        return res;
}

static const struct drm_gem_object_funcs panthor_gem_funcs = {
        .free = panthor_gem_free_object,
        .print_info = drm_gem_shmem_object_print_info,
        .pin = drm_gem_shmem_object_pin,
        .unpin = drm_gem_shmem_object_unpin,
        .get_sg_table = drm_gem_shmem_object_get_sg_table,
        .vmap = drm_gem_shmem_object_vmap,
        .vunmap = drm_gem_shmem_object_vunmap,
        .mmap = drm_gem_shmem_object_mmap,
        .status = panthor_gem_status,
        .export = panthor_gem_prime_export,
        .vm_ops = &drm_gem_shmem_vm_ops,
};

/**
 * panthor_gem_create_object - Implementation of driver->gem_create_object.
 * @ddev: DRM device
 * @size: Size in bytes of the memory the object will reference
 *
 * This lets the GEM helpers allocate object structs for us, and keep
 * our BO stats correct.
 */
struct drm_gem_object *panthor_gem_create_object(struct drm_device *ddev, size_t size)
{
        struct panthor_gem_object *obj;

        obj = kzalloc_obj(*obj);
        if (!obj)
                return ERR_PTR(-ENOMEM);

        obj->base.base.funcs = &panthor_gem_funcs;
        mutex_init(&obj->label.lock);

        panthor_gem_debugfs_bo_init(obj);

        return &obj->base.base;
}

/**
 * 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 drm_gem_shmem_object *shmem;
        struct panthor_gem_object *bo;

        shmem = drm_gem_shmem_create(ddev, *size);
        if (IS_ERR(shmem))
                return PTR_ERR(shmem);

        bo = to_panthor_bo(&shmem->base);
        bo->flags = flags;
        bo->base.map_wc = should_map_wc(bo, exclusive_vm);

        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.base.resv = bo->exclusive_vm_root_gem->resv;
        }

        panthor_gem_debugfs_set_usage_flags(bo, 0);

        /* If this is a write-combine mapping, we query the sgt to force a CPU
         * cache flush (dma_map_sgtable() is called when the sgt is created).
         * This ensures the zero-ing is visible to any uncached mapping created
         * by vmap/mmap.
         * FIXME: Ideally this should be done when pages are allocated, not at
         * BO creation time.
         */
        if (shmem->map_wc) {
                struct sg_table *sgt;

                sgt = drm_gem_shmem_get_pages_sgt(shmem);
                if (IS_ERR(sgt)) {
                        ret = PTR_ERR(sgt);
                        goto out_put_gem;
                }
        }

        /*
         * 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, &shmem->base, handle);
        if (!ret)
                *size = bo->base.base.size;

out_put_gem:
        /* drop reference from allocate - handle holds it now. */
        drm_gem_object_put(&shmem->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 drm_gem_shmem_object *shmem = &bo->base;
        const struct drm_device *dev = shmem->base.dev;
        struct sg_table *sgt;
        struct scatterlist *sgl;
        unsigned int count;

        /* Make sure the range is in bounds. */
        if (offset + size < offset || offset + size > shmem->base.size)
                return -EINVAL;

        /* Disallow CPU-cache maintenance on imported buffers. */
        if (drm_gem_is_imported(&shmem->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 (shmem->map_wc)
                return 0;

        /* Nothing to do if the size is zero. */
        if (size == 0)
                return 0;

        sgt = drm_gem_shmem_get_pages_sgt(shmem);
        if (IS_ERR(sgt))
                return PTR_ERR(sgt);

        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 <page,offset,size> 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(dev->dev, paddr, len, DMA_TO_DEVICE);
                if (type == DRM_PANTHOR_BO_SYNC_CPU_CACHE_FLUSH_AND_INVALIDATE)
                        dma_sync_single_for_cpu(dev->dev, paddr, len, DMA_FROM_DEVICE);
        }

        return 0;
}

#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",
        };

        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)
{
        unsigned int refcount = kref_read(&bo->base.base.refcount);
        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->base.pages ? bo->base.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%-16d%-16zd%-16zd0x%-16lx",
                   creator_info,
                   bo->base.base.name,
                   refcount,
                   bo->base.base.size,
                   resident_size,
                   drm_vma_node_start(&bo->base.base.vma_node));

        if (bo->base.base.import_attach)
                gem_state_flags |= PANTHOR_DEBUGFS_GEM_STATE_FLAG_IMPORTED;
        if (bo->base.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.base.size;
        totals->resident += resident_size;
        if (bo->base.madv > 0)
                totals->reclaimable += resident_size;
}

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        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);
}
#endif