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path: root/drivers/gpu/drm/ttm/ttm_device.c
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Diffstat (limited to 'drivers/gpu/drm/ttm/ttm_device.c')
-rw-r--r--drivers/gpu/drm/ttm/ttm_device.c268
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..9b787b3caeb5
--- /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 = -EBUSY;
+
+ 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);