/* SPDX-License-Identifier: GPL-2.0 OR MIT */
/*
* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
* Copyright 2020 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: Christian König
*/
#define pr_fmt(fmt) "[TTM DEVICE] " fmt
#include <linux/debugfs.h>
#include <linux/mm.h>
#include <drm/ttm/ttm_bo.h>
#include <drm/ttm/ttm_device.h>
#include <drm/ttm/ttm_tt.h>
#include <drm/ttm/ttm_placement.h>
#include "ttm_module.h"
/*
* ttm_global_mutex - protecting the global state
*/
static DEFINE_MUTEX(ttm_global_mutex);
static unsigned ttm_glob_use_count;
struct ttm_global ttm_glob;
EXPORT_SYMBOL(ttm_glob);
struct dentry *ttm_debugfs_root;
static void ttm_global_release(void)
{
struct ttm_global *glob = &ttm_glob;
mutex_lock(&ttm_global_mutex);
if (--ttm_glob_use_count > 0)
goto out;
ttm_pool_mgr_fini();
debugfs_remove(ttm_debugfs_root);
__free_page(glob->dummy_read_page);
memset(glob, 0, sizeof(*glob));
out:
mutex_unlock(&ttm_global_mutex);
}
static int ttm_global_init(void)
{
struct ttm_global *glob = &ttm_glob;
unsigned long num_pages, num_dma32;
struct sysinfo si;
int ret = 0;
mutex_lock(&ttm_global_mutex);
if (++ttm_glob_use_count > 1)
goto out;
si_meminfo(&si);
ttm_debugfs_root = debugfs_create_dir("ttm", NULL);
if (IS_ERR(ttm_debugfs_root)) {
ttm_debugfs_root = NULL;
}
/* Limit the number of pages in the pool to about 50% of the total
* system memory.
*/
num_pages = ((u64)si.totalram * si.mem_unit) >> PAGE_SHIFT;
num_pages /= 2;
/* But for DMA32 we limit ourself to only use 2GiB maximum. */
num_dma32 = (u64)(si.totalram - si.totalhigh) * si.mem_unit
>> PAGE_SHIFT;
num_dma32 = min(num_dma32, 2UL << (30 - PAGE_SHIFT));
ttm_pool_mgr_init(num_pages);
ttm_tt_mgr_init(num_pages, num_dma32);
glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32 |
__GFP_NOWARN);
/* Retry without GFP_DMA32 for platforms DMA32 is not available */
if (unlikely(glob->dummy_read_page == NULL)) {
glob->dummy_read_page = alloc_page(__GFP_ZERO);
if (unlikely(glob->dummy_read_page == NULL)) {
ret = -ENOMEM;
goto out;
}
pr_warn("Using GFP_DMA32 fallback for dummy_read_page\n");
}
INIT_LIST_HEAD(&glob->device_list);
atomic_set(&glob->bo_count, 0);
debugfs_create_atomic_t("buffer_objects", 0444, ttm_debugfs_root,
&glob->bo_count);
out:
if (ret && ttm_debugfs_root)
debugfs_remove(ttm_debugfs_root);
if (ret)
--ttm_glob_use_count;
mutex_unlock(&ttm_global_mutex);
return ret;
}
/*
* A buffer object shrink method that tries to swap out the first
* buffer object on the global::swap_lru list.
*/
int ttm_global_swapout(struct ttm_operation_ctx *ctx, gfp_t gfp_flags)
{
struct ttm_global *glob = &ttm_glob;
struct ttm_device *bdev;
int ret = 0;
mutex_lock(&ttm_global_mutex);
list_for_each_entry(bdev, &glob->device_list, device_list) {
ret = ttm_device_swapout(bdev, ctx, gfp_flags);
if (ret > 0) {
list_move_tail(&bdev->device_list, &glob->device_list);
break;
}
}
mutex_unlock(&ttm_global_mutex);
return ret;
}
int ttm_device_swapout(struct ttm_device *bdev, struct ttm_operation_ctx *ctx,
gfp_t gfp_flags)
{
struct ttm_resource_manager *man;
unsigned i;
s64 lret;
for (i = TTM_PL_SYSTEM; i < TTM_NUM_MEM_TYPES; ++i) {
man = ttm_manager_type(bdev, i);
if (!man || !man->use_tt)
continue;
lret = ttm_bo_swapout(bdev, ctx, man, gfp_flags, 1);
/* Can be both positive (num_pages) and negative (error) */
if (lret)
return lret;
}
return 0;
}
EXPORT_SYMBOL(ttm_device_swapout);
/**
* ttm_device_init
*
* @bdev: A pointer to a struct ttm_device to initialize.
* @funcs: Function table for the device.
* @dev: The core kernel device pointer for DMA mappings and allocations.
* @mapping: The address space to use for this bo.
* @vma_manager: A pointer to a vma manager.
* @use_dma_alloc: If coherent DMA allocation API should be used.
* @use_dma32: If we should use GFP_DMA32 for device memory allocations.
*
* Initializes a struct ttm_device:
* Returns:
* !0: Failure.
*/
int ttm_device_init(struct ttm_device *bdev, const struct ttm_device_funcs *funcs,
struct device *dev, struct address_space *mapping,
struct drm_vma_offset_manager *vma_manager,
bool use_dma_alloc, bool use_dma32)
{
struct ttm_global *glob = &ttm_glob;
int ret, nid;
if (WARN_ON(vma_manager == NULL))
return -EINVAL;
ret = ttm_global_init();
if (ret)
return ret;
bdev->wq = alloc_workqueue("ttm",
WQ_MEM_RECLAIM | WQ_HIGHPRI | WQ_UNBOUND, 16);
if (!bdev->wq) {
ttm_global_release();
return -ENOMEM;
}
bdev->funcs = funcs;
ttm_sys_man_init(bdev);
if (dev)
nid = dev_to_node(dev);
else
nid = NUMA_NO_NODE;
ttm_pool_init(&bdev->pool, dev, nid, use_dma_alloc, use_dma32);
bdev->vma_manager = vma_manager;
spin_lock_init(&bdev->lru_lock);
INIT_LIST_HEAD(&bdev->pinned);
bdev->dev_mapping = mapping;
mutex_lock(&ttm_global_mutex);
list_add_tail(&bdev->device_list, &glob->device_list);
mutex_unlock(&ttm_global_mutex);
return 0;
}
EXPORT_SYMBOL(ttm_device_init);
void ttm_device_fini(struct ttm_device *bdev)
{
struct ttm_resource_manager *man;
unsigned i;
mutex_lock(&ttm_global_mutex);
list_del(&bdev->device_list);
mutex_unlock(&ttm_global_mutex);
drain_workqueue(bdev->wq);
destroy_workqueue(bdev->wq);
man = ttm_manager_type(bdev, TTM_PL_SYSTEM);
ttm_resource_manager_set_used(man, false);
ttm_set_driver_manager(bdev, TTM_PL_SYSTEM, NULL);
spin_lock(&bdev->lru_lock);
for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
if (list_empty(&man->lru[0]))
pr_debug("Swap list %d was clean\n", i);
spin_unlock(&bdev->lru_lock);
ttm_pool_fini(&bdev->pool);
ttm_global_release();
}
EXPORT_SYMBOL(ttm_device_fini);
static void ttm_device_clear_lru_dma_mappings(struct ttm_device *bdev,
struct list_head *list)
{
struct ttm_resource *res;
spin_lock(&bdev->lru_lock);
while ((res = ttm_lru_first_res_or_null(list))) {
struct ttm_buffer_object *bo = res->bo;
/* Take ref against racing releases once lru_lock is unlocked */
if (!ttm_bo_get_unless_zero(bo))
continue;
list_del_init(&bo->resource->lru.link);
spin_unlock(&bdev->lru_lock);
if (bo->ttm)
ttm_tt_unpopulate(bo->bdev, bo->ttm);
ttm_bo_put(bo);
spin_lock(&bdev->lru_lock);
}
spin_unlock(&bdev->lru_lock);
}
void ttm_device_clear_dma_mappings(struct ttm_device *bdev)
{
struct ttm_resource_manager *man;
unsigned int i, j;
ttm_device_clear_lru_dma_mappings(bdev, &bdev->pinned);
for (i = TTM_PL_SYSTEM; i < TTM_NUM_MEM_TYPES; ++i) {
man = ttm_manager_type(bdev, i);
if (!man || !man->use_tt)
continue;
for (j = 0; j < TTM_MAX_BO_PRIORITY; ++j)
ttm_device_clear_lru_dma_mappings(bdev, &man->lru[j]);
}
}
EXPORT_SYMBOL(ttm_device_clear_dma_mappings);
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