linux/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
Christian König cc25188afd drm/amdgpu: reserve the first 2x512 pages of GART
We want to use them as remap address space.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2017-07-14 11:06:20 -04:00

276 lines
6.7 KiB
C

/*
* Copyright 2016 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
*/
#include <drm/drmP.h>
#include "amdgpu.h"
struct amdgpu_gtt_mgr {
struct drm_mm mm;
spinlock_t lock;
uint64_t available;
};
/**
* amdgpu_gtt_mgr_init - init GTT manager and DRM MM
*
* @man: TTM memory type manager
* @p_size: maximum size of GTT
*
* Allocate and initialize the GTT manager.
*/
static int amdgpu_gtt_mgr_init(struct ttm_mem_type_manager *man,
unsigned long p_size)
{
struct amdgpu_gtt_mgr *mgr;
uint64_t start, size;
mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
if (!mgr)
return -ENOMEM;
start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
size = p_size - start;
drm_mm_init(&mgr->mm, start, size);
spin_lock_init(&mgr->lock);
mgr->available = p_size;
man->priv = mgr;
return 0;
}
/**
* amdgpu_gtt_mgr_fini - free and destroy GTT manager
*
* @man: TTM memory type manager
*
* Destroy and free the GTT manager, returns -EBUSY if ranges are still
* allocated inside it.
*/
static int amdgpu_gtt_mgr_fini(struct ttm_mem_type_manager *man)
{
struct amdgpu_gtt_mgr *mgr = man->priv;
spin_lock(&mgr->lock);
if (!drm_mm_clean(&mgr->mm)) {
spin_unlock(&mgr->lock);
return -EBUSY;
}
drm_mm_takedown(&mgr->mm);
spin_unlock(&mgr->lock);
kfree(mgr);
man->priv = NULL;
return 0;
}
/**
* amdgpu_gtt_mgr_is_allocated - Check if mem has address space
*
* @mem: the mem object to check
*
* Check if a mem object has already address space allocated.
*/
bool amdgpu_gtt_mgr_is_allocated(struct ttm_mem_reg *mem)
{
struct drm_mm_node *node = mem->mm_node;
return (node->start != AMDGPU_BO_INVALID_OFFSET);
}
/**
* amdgpu_gtt_mgr_alloc - allocate new ranges
*
* @man: TTM memory type manager
* @tbo: TTM BO we need this range for
* @place: placement flags and restrictions
* @mem: the resulting mem object
*
* Allocate the address space for a node.
*/
int amdgpu_gtt_mgr_alloc(struct ttm_mem_type_manager *man,
struct ttm_buffer_object *tbo,
const struct ttm_place *place,
struct ttm_mem_reg *mem)
{
struct amdgpu_gtt_mgr *mgr = man->priv;
struct drm_mm_node *node = mem->mm_node;
enum drm_mm_insert_mode mode;
unsigned long fpfn, lpfn;
int r;
if (amdgpu_gtt_mgr_is_allocated(mem))
return 0;
if (place)
fpfn = place->fpfn;
else
fpfn = 0;
if (place && place->lpfn)
lpfn = place->lpfn;
else
lpfn = man->size;
mode = DRM_MM_INSERT_BEST;
if (place && place->flags & TTM_PL_FLAG_TOPDOWN)
mode = DRM_MM_INSERT_HIGH;
spin_lock(&mgr->lock);
r = drm_mm_insert_node_in_range(&mgr->mm, node,
mem->num_pages, mem->page_alignment, 0,
fpfn, lpfn, mode);
spin_unlock(&mgr->lock);
if (!r) {
mem->start = node->start;
if (&tbo->mem == mem)
tbo->offset = (tbo->mem.start << PAGE_SHIFT) +
tbo->bdev->man[tbo->mem.mem_type].gpu_offset;
}
return r;
}
void amdgpu_gtt_mgr_print(struct seq_file *m, struct ttm_mem_type_manager *man)
{
struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
struct amdgpu_gtt_mgr *mgr = man->priv;
seq_printf(m, "man size:%llu pages, gtt available:%llu pages, usage:%lluMB\n",
man->size, mgr->available, (u64)atomic64_read(&adev->gtt_usage) >> 20);
}
/**
* amdgpu_gtt_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, allocate the node but no space for it yet.
*/
static int amdgpu_gtt_mgr_new(struct ttm_mem_type_manager *man,
struct ttm_buffer_object *tbo,
const struct ttm_place *place,
struct ttm_mem_reg *mem)
{
struct amdgpu_gtt_mgr *mgr = man->priv;
struct drm_mm_node *node;
int r;
spin_lock(&mgr->lock);
if (mgr->available < mem->num_pages) {
spin_unlock(&mgr->lock);
return 0;
}
mgr->available -= mem->num_pages;
spin_unlock(&mgr->lock);
node = kzalloc(sizeof(*node), GFP_KERNEL);
if (!node) {
r = -ENOMEM;
goto err_out;
}
node->start = AMDGPU_BO_INVALID_OFFSET;
node->size = mem->num_pages;
mem->mm_node = node;
if (place->fpfn || place->lpfn || place->flags & TTM_PL_FLAG_TOPDOWN) {
r = amdgpu_gtt_mgr_alloc(man, tbo, place, mem);
if (unlikely(r)) {
kfree(node);
mem->mm_node = NULL;
r = 0;
goto err_out;
}
} else {
mem->start = node->start;
}
return 0;
err_out:
spin_lock(&mgr->lock);
mgr->available += mem->num_pages;
spin_unlock(&mgr->lock);
return r;
}
/**
* amdgpu_gtt_mgr_del - free ranges
*
* @man: TTM memory type manager
* @tbo: TTM BO we need this range for
* @place: placement flags and restrictions
* @mem: TTM memory object
*
* Free the allocated GTT again.
*/
static void amdgpu_gtt_mgr_del(struct ttm_mem_type_manager *man,
struct ttm_mem_reg *mem)
{
struct amdgpu_gtt_mgr *mgr = man->priv;
struct drm_mm_node *node = mem->mm_node;
if (!node)
return;
spin_lock(&mgr->lock);
if (node->start != AMDGPU_BO_INVALID_OFFSET)
drm_mm_remove_node(node);
mgr->available += mem->num_pages;
spin_unlock(&mgr->lock);
kfree(node);
mem->mm_node = NULL;
}
/**
* amdgpu_gtt_mgr_debug - dump VRAM table
*
* @man: TTM memory type manager
* @prefix: text prefix
*
* Dump the table content using printk.
*/
static void amdgpu_gtt_mgr_debug(struct ttm_mem_type_manager *man,
const char *prefix)
{
struct amdgpu_gtt_mgr *mgr = man->priv;
struct drm_printer p = drm_debug_printer(prefix);
spin_lock(&mgr->lock);
drm_mm_print(&mgr->mm, &p);
spin_unlock(&mgr->lock);
}
const struct ttm_mem_type_manager_func amdgpu_gtt_mgr_func = {
.init = amdgpu_gtt_mgr_init,
.takedown = amdgpu_gtt_mgr_fini,
.get_node = amdgpu_gtt_mgr_new,
.put_node = amdgpu_gtt_mgr_del,
.debug = amdgpu_gtt_mgr_debug
};