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// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
* Copyright 2016-2021 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, Felix Kuehling
*/
#include "amdgpu.h"
static inline struct amdgpu_preempt_mgr *
to_preempt_mgr(struct ttm_resource_manager *man)
{
return container_of(man, struct amdgpu_preempt_mgr, manager);
}
/**
* DOC: mem_info_preempt_used
*
* The amdgpu driver provides a sysfs API for reporting current total amount of
* used preemptible memory.
* The file mem_info_preempt_used is used for this, and returns the current
* used size of the preemptible block, in bytes
*/
static ssize_t mem_info_preempt_used_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct drm_device *ddev = dev_get_drvdata(dev);
struct amdgpu_device *adev = drm_to_adev(ddev);
struct ttm_resource_manager *man;
man = ttm_manager_type(&adev->mman.bdev, AMDGPU_PL_PREEMPT);
return sysfs_emit(buf, "%llu\n", amdgpu_preempt_mgr_usage(man));
}
static DEVICE_ATTR_RO(mem_info_preempt_used);
/**
* amdgpu_preempt_mgr_new - allocate a new node
*
* @man: TTM memory type manager
* @tbo: TTM BO we need this range for
* @place: placement flags and restrictions
* @mem: the resulting mem object
*
* Dummy, just count the space used without allocating resources or any limit.
*/
static int amdgpu_preempt_mgr_new(struct ttm_resource_manager *man,
struct ttm_buffer_object *tbo,
const struct ttm_place *place,
struct ttm_resource **res)
{
struct amdgpu_preempt_mgr *mgr = to_preempt_mgr(man);
*res = kzalloc(sizeof(**res), GFP_KERNEL);
if (!*res)
return -ENOMEM;
ttm_resource_init(tbo, place, *res);
(*res)->start = AMDGPU_BO_INVALID_OFFSET;
atomic64_add((*res)->num_pages, &mgr->used);
return 0;
}
/**
* amdgpu_preempt_mgr_del - free ranges
*
* @man: TTM memory type manager
* @mem: TTM memory object
*
* Free the allocated GTT again.
*/
static void amdgpu_preempt_mgr_del(struct ttm_resource_manager *man,
struct ttm_resource *res)
{
struct amdgpu_preempt_mgr *mgr = to_preempt_mgr(man);
atomic64_sub(res->num_pages, &mgr->used);
kfree(res);
}
/**
* amdgpu_preempt_mgr_usage - return usage of PREEMPT domain
*
* @man: TTM memory type manager
*
* Return how many bytes are used in the GTT domain
*/
uint64_t amdgpu_preempt_mgr_usage(struct ttm_resource_manager *man)
{
struct amdgpu_preempt_mgr *mgr = to_preempt_mgr(man);
s64 result = atomic64_read(&mgr->used);
return (result > 0 ? result : 0) * PAGE_SIZE;
}
/**
* amdgpu_preempt_mgr_debug - dump VRAM table
*
* @man: TTM memory type manager
* @printer: DRM printer to use
*
* Dump the table content using printk.
*/
static void amdgpu_preempt_mgr_debug(struct ttm_resource_manager *man,
struct drm_printer *printer)
{
struct amdgpu_preempt_mgr *mgr = to_preempt_mgr(man);
drm_printf(printer, "man size:%llu pages, preempt used:%lld pages\n",
man->size, (u64)atomic64_read(&mgr->used));
}
static const struct ttm_resource_manager_func amdgpu_preempt_mgr_func = {
.alloc = amdgpu_preempt_mgr_new,
.free = amdgpu_preempt_mgr_del,
.debug = amdgpu_preempt_mgr_debug
};
/**
* amdgpu_preempt_mgr_init - init PREEMPT manager and DRM MM
*
* @adev: amdgpu_device pointer
*
* Allocate and initialize the GTT manager.
*/
int amdgpu_preempt_mgr_init(struct amdgpu_device *adev)
{
struct amdgpu_preempt_mgr *mgr = &adev->mman.preempt_mgr;
struct ttm_resource_manager *man = &mgr->manager;
int ret;
man->use_tt = true;
man->func = &amdgpu_preempt_mgr_func;
ttm_resource_manager_init(man, (1 << 30));
atomic64_set(&mgr->used, 0);
ret = device_create_file(adev->dev, &dev_attr_mem_info_preempt_used);
if (ret) {
DRM_ERROR("Failed to create device file mem_info_preempt_used\n");
return ret;
}
ttm_set_driver_manager(&adev->mman.bdev, AMDGPU_PL_PREEMPT,
&mgr->manager);
ttm_resource_manager_set_used(man, true);
return 0;
}
/**
* amdgpu_preempt_mgr_fini - free and destroy GTT manager
*
* @adev: amdgpu_device pointer
*
* Destroy and free the GTT manager, returns -EBUSY if ranges are still
* allocated inside it.
*/
void amdgpu_preempt_mgr_fini(struct amdgpu_device *adev)
{
struct amdgpu_preempt_mgr *mgr = &adev->mman.preempt_mgr;
struct ttm_resource_manager *man = &mgr->manager;
int ret;
ttm_resource_manager_set_used(man, false);
ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);
if (ret)
return;
device_remove_file(adev->dev, &dev_attr_mem_info_preempt_used);
ttm_resource_manager_cleanup(man);
ttm_set_driver_manager(&adev->mman.bdev, AMDGPU_PL_PREEMPT, NULL);
}
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