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author | Maxime Ripard <maxime@cerno.tech> | 2021-05-11 13:35:52 +0200 |
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committer | Maxime Ripard <maxime@cerno.tech> | 2021-05-11 13:35:52 +0200 |
commit | c55b44c9386f3ee1b08752638559f19deaf6040d (patch) | |
tree | c843a21f45180387fcd9eb2625cc9d1f166a3156 /drivers/gpu/drm/ttm/ttm_device.c | |
parent | MAINTAINERS: Update my e-mail (diff) | |
parent | Linux 5.13-rc1 (diff) | |
download | linux-c55b44c9386f3ee1b08752638559f19deaf6040d.tar.xz linux-c55b44c9386f3ee1b08752638559f19deaf6040d.zip |
Merge drm/drm-fixes into drm-misc-fixes
Start this new release drm-misc-fixes branch
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Diffstat (limited to 'drivers/gpu/drm/ttm/ttm_device.c')
-rw-r--r-- | drivers/gpu/drm/ttm/ttm_device.c | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_device.c b/drivers/gpu/drm/ttm/ttm_device.c new file mode 100644 index 000000000000..510e3e001dab --- /dev/null +++ b/drivers/gpu/drm/ttm/ttm_device.c @@ -0,0 +1,268 @@ +/* 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/mm.h> + +#include <drm/ttm/ttm_device.h> +#include <drm/ttm/ttm_tt.h> +#include <drm/ttm/ttm_placement.h> +#include <drm/ttm/ttm_bo_api.h> + +#include "ttm_module.h" + +/** + * ttm_global_mutex - protecting the global state + */ +DEFINE_MUTEX(ttm_global_mutex); +unsigned ttm_glob_use_count; +struct ttm_global ttm_glob; +EXPORT_SYMBOL(ttm_glob); + +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(); + + __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); + + /* 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); + + if (unlikely(glob->dummy_read_page == NULL)) { + ret = -ENOMEM; + goto out; + } + + 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: + 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; +} +EXPORT_SYMBOL(ttm_global_swapout); + +int ttm_device_swapout(struct ttm_device *bdev, struct ttm_operation_ctx *ctx, + gfp_t gfp_flags) +{ + struct ttm_resource_manager *man; + struct ttm_buffer_object *bo; + unsigned i, j; + int ret; + + spin_lock(&bdev->lru_lock); + 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) { + list_for_each_entry(bo, &man->lru[j], lru) { + uint32_t num_pages; + + if (!bo->ttm || + bo->ttm->page_flags & TTM_PAGE_FLAG_SG || + bo->ttm->page_flags & TTM_PAGE_FLAG_SWAPPED) + continue; + + num_pages = bo->ttm->num_pages; + ret = ttm_bo_swapout(bo, ctx, gfp_flags); + /* ttm_bo_swapout has dropped the lru_lock */ + if (!ret) + return num_pages; + if (ret != -EBUSY) + return ret; + } + } + } + spin_unlock(&bdev->lru_lock); + return 0; +} +EXPORT_SYMBOL(ttm_device_swapout); + +static void ttm_init_sysman(struct ttm_device *bdev) +{ + struct ttm_resource_manager *man = &bdev->sysman; + + /* + * Initialize the system memory buffer type. + * Other types need to be driver / IOCTL initialized. + */ + man->use_tt = true; + + ttm_resource_manager_init(man, 0); + ttm_set_driver_manager(bdev, TTM_PL_SYSTEM, man); + ttm_resource_manager_set_used(man, true); +} + +static void ttm_device_delayed_workqueue(struct work_struct *work) +{ + struct ttm_device *bdev = + container_of(work, struct ttm_device, wq.work); + + if (!ttm_bo_delayed_delete(bdev, false)) + schedule_delayed_work(&bdev->wq, + ((HZ / 100) < 1) ? 1 : HZ / 100); +} + +/** + * 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, 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; + + if (WARN_ON(vma_manager == NULL)) + return -EINVAL; + + ret = ttm_global_init(); + if (ret) + return ret; + + bdev->funcs = funcs; + + ttm_init_sysman(bdev); + ttm_pool_init(&bdev->pool, dev, use_dma_alloc, use_dma32); + + bdev->vma_manager = vma_manager; + INIT_DELAYED_WORK(&bdev->wq, ttm_device_delayed_workqueue); + spin_lock_init(&bdev->lru_lock); + INIT_LIST_HEAD(&bdev->ddestroy); + 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; + + man = ttm_manager_type(bdev, TTM_PL_SYSTEM); + ttm_resource_manager_set_used(man, false); + ttm_set_driver_manager(bdev, TTM_PL_SYSTEM, NULL); + + mutex_lock(&ttm_global_mutex); + list_del(&bdev->device_list); + mutex_unlock(&ttm_global_mutex); + + cancel_delayed_work_sync(&bdev->wq); + + if (ttm_bo_delayed_delete(bdev, true)) + pr_debug("Delayed destroy list was clean\n"); + + 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); |