/*
* 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 "amdgpu.h"
struct amdgpu_vram_mgr {
struct drm_mm mm;
spinlock_t lock;
atomic64_t usage;
atomic64_t vis_usage;
};
/**
* DOC: mem_info_vram_total
*
* The amdgpu driver provides a sysfs API for reporting current total VRAM
* available on the device
* The file mem_info_vram_total is used for this and returns the total
* amount of VRAM in bytes
*/
static ssize_t amdgpu_mem_info_vram_total_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct drm_device *ddev = dev_get_drvdata(dev);
struct amdgpu_device *adev = ddev->dev_private;
return snprintf(buf, PAGE_SIZE, "%llu\n", adev->gmc.real_vram_size);
}
/**
* DOC: mem_info_vis_vram_total
*
* The amdgpu driver provides a sysfs API for reporting current total
* visible VRAM available on the device
* The file mem_info_vis_vram_total is used for this and returns the total
* amount of visible VRAM in bytes
*/
static ssize_t amdgpu_mem_info_vis_vram_total_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct drm_device *ddev = dev_get_drvdata(dev);
struct amdgpu_device *adev = ddev->dev_private;
return snprintf(buf, PAGE_SIZE, "%llu\n", adev->gmc.visible_vram_size);
}
/**
* DOC: mem_info_vram_used
*
* The amdgpu driver provides a sysfs API for reporting current total VRAM
* available on the device
* The file mem_info_vram_used is used for this and returns the total
* amount of currently used VRAM in bytes
*/
static ssize_t amdgpu_mem_info_vram_used_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct drm_device *ddev = dev_get_drvdata(dev);
struct amdgpu_device *adev = ddev->dev_private;
return snprintf(buf, PAGE_SIZE, "%llu\n",
amdgpu_vram_mgr_usage(&adev->mman.bdev.man[TTM_PL_VRAM]));
}
/**
* DOC: mem_info_vis_vram_used
*
* The amdgpu driver provides a sysfs API for reporting current total of
* used visible VRAM
* The file mem_info_vis_vram_used is used for this and returns the total
* amount of currently used visible VRAM in bytes
*/
static ssize_t amdgpu_mem_info_vis_vram_used_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct drm_device *ddev = dev_get_drvdata(dev);
struct amdgpu_device *adev = ddev->dev_private;
return snprintf(buf, PAGE_SIZE, "%llu\n",
amdgpu_vram_mgr_vis_usage(&adev->mman.bdev.man[TTM_PL_VRAM]));
}
static DEVICE_ATTR(mem_info_vram_total, S_IRUGO,
amdgpu_mem_info_vram_total_show, NULL);
static DEVICE_ATTR(mem_info_vis_vram_total, S_IRUGO,
amdgpu_mem_info_vis_vram_total_show,NULL);
static DEVICE_ATTR(mem_info_vram_used, S_IRUGO,
amdgpu_mem_info_vram_used_show, NULL);
static DEVICE_ATTR(mem_info_vis_vram_used, S_IRUGO,
amdgpu_mem_info_vis_vram_used_show, NULL);
/**
* amdgpu_vram_mgr_init - init VRAM manager and DRM MM
*
* @man: TTM memory type manager
* @p_size: maximum size of VRAM
*
* Allocate and initialize the VRAM manager.
*/
static int amdgpu_vram_mgr_init(struct ttm_mem_type_manager *man,
unsigned long p_size)
{
struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
struct amdgpu_vram_mgr *mgr;
int ret;
mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
if (!mgr)
return -ENOMEM;
drm_mm_init(&mgr->mm, 0, p_size);
spin_lock_init(&mgr->lock);
man->priv = mgr;
/* Add the two VRAM-related sysfs files */
ret = device_create_file(adev->dev, &dev_attr_mem_info_vram_total);
if (ret) {
DRM_ERROR("Failed to create device file mem_info_vram_total\n");
return ret;
}
ret = device_create_file(adev->dev, &dev_attr_mem_info_vis_vram_total);
if (ret) {
DRM_ERROR("Failed to create device file mem_info_vis_vram_total\n");
return ret;
}
ret = device_create_file(adev->dev, &dev_attr_mem_info_vram_used);
if (ret) {
DRM_ERROR("Failed to create device file mem_info_vram_used\n");
return ret;
}
ret = device_create_file(adev->dev, &dev_attr_mem_info_vis_vram_used);
if (ret) {
DRM_ERROR("Failed to create device file mem_info_vis_vram_used\n");
return ret;
}
return 0;
}
/**
* amdgpu_vram_mgr_fini - free and destroy VRAM manager
*
* @man: TTM memory type manager
*
* Destroy and free the VRAM manager, returns -EBUSY if ranges are still
* allocated inside it.
*/
static int amdgpu_vram_mgr_fini(struct ttm_mem_type_manager *man)
{
struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
struct amdgpu_vram_mgr *mgr = man->priv;
spin_lock(&mgr->lock);
drm_mm_takedown(&mgr->mm);
spin_unlock(&mgr->lock);
kfree(mgr);
man->priv = NULL;
device_remove_file(adev->dev, &dev_attr_mem_info_vram_total);
device_remove_file(adev->dev, &dev_attr_mem_info_vis_vram_total);
device_remove_file(adev->dev, &dev_attr_mem_info_vram_used);
device_remove_file(adev->dev, &dev_attr_mem_info_vis_vram_used);
return 0;
}
/**
* amdgpu_vram_mgr_vis_size - Calculate visible node size
*
* @adev: amdgpu device structure
* @node: MM node structure
*
* Calculate how many bytes of the MM node are inside visible VRAM
*/
static u64 amdgpu_vram_mgr_vis_size(struct amdgpu_device *adev,
struct drm_mm_node *node)
{
uint64_t start = node->start << PAGE_SHIFT;
uint64_t end = (node->size + node->start) << PAGE_SHIFT;
if (start >= adev->gmc.visible_vram_size)
return 0;
return (end > adev->gmc.visible_vram_size ?
adev->gmc.visible_vram_size : end) - start;
}
/**
* amdgpu_vram_mgr_bo_visible_size - CPU visible BO size
*
* @bo: &amdgpu_bo buffer object (must be in VRAM)
*
* Returns:
* How much of the given &amdgpu_bo buffer object lies in CPU visible VRAM.
*/
u64 amdgpu_vram_mgr_bo_visible_size(struct amdgpu_bo *bo)
{
struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
struct ttm_mem_reg *mem = &bo->tbo.mem;
struct drm_mm_node *nodes = mem->mm_node;
unsigned pages = mem->num_pages;
u64 usage;
if (amdgpu_gmc_vram_full_visible(&adev->gmc))
return amdgpu_bo_size(bo);
if (mem->start >= adev->gmc.visible_vram_size >> PAGE_SHIFT)
return 0;
for (usage = 0; nodes && pages; pages -= nodes->size, nodes++)
usage += amdgpu_vram_mgr_vis_size(adev, nodes);
return usage;
}
/**
* amdgpu_vram_mgr_virt_start - update virtual start address
*
* @mem: ttm_mem_reg to update
* @node: just allocated node
*
* Calculate a virtual BO start address to easily check if everything is CPU
* accessible.
*/
static void amdgpu_vram_mgr_virt_start(struct ttm_mem_reg *mem,
struct drm_mm_node *node)
{
unsigned long start;
start = node->start + node->size;
if (start > mem->num_pages)
start -= mem->num_pages;
else
start = 0;
mem->start = max(mem->start, start);
}
/**
* amdgpu_vram_mgr_new - 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 VRAM for the given BO.
*/
static int amdgpu_vram_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_device *adev = amdgpu_ttm_adev(man->bdev);
struct amdgpu_vram_mgr *mgr = man->priv;
struct drm_mm *mm = &mgr->mm;
struct drm_mm_node *nodes;
enum drm_mm_insert_mode mode;
unsigned long lpfn, num_nodes, pages_per_node, pages_left;
uint64_t vis_usage = 0, mem_bytes;
unsigned i;
int r;
lpfn = place->lpfn;
if (!lpfn)
lpfn = man->size;
/* bail out quickly if there's likely not enough VRAM for this BO */
mem_bytes = (u64)mem->num_pages << PAGE_SHIFT;
if (atomic64_add_return(mem_bytes, &mgr->usage) > adev->gmc.mc_vram_size) {
atomic64_sub(mem_bytes, &mgr->usage);
mem->mm_node = NULL;
return 0;
}
if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
pages_per_node = ~0ul;
num_nodes = 1;
} else {
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
pages_per_node = HPAGE_PMD_NR;
#else
/* default to 2MB */
pages_per_node = (2UL << (20UL - PAGE_SHIFT));
#endif
pages_per_node = max((uint32_t)pages_per_node, mem->page_alignment);
num_nodes = DIV_ROUND_UP(mem->num_pages, pages_per_node);
}
nodes = kvmalloc_array((uint32_t)num_nodes, sizeof(*nodes),
GFP_KERNEL | __GFP_ZERO);
if (!nodes) {
atomic64_sub(mem_bytes, &mgr->usage);
return -ENOMEM;
}
mode = DRM_MM_INSERT_BEST;
if (place->flags & TTM_PL_FLAG_TOPDOWN)
mode = DRM_MM_INSERT_HIGH;
mem->start = 0;
pages_left = mem->num_pages;
spin_lock(&mgr->lock);
for (i = 0; pages_left >= pages_per_node; ++i) {
unsigned long pages = rounddown_pow_of_two(pages_left);
r = drm_mm_insert_node_in_range(mm, &nodes[i], pages,
pages_per_node, 0,
place->fpfn, lpfn,
mode);
if (unlikely(r))
break;
vis_usage += amdgpu_vram_mgr_vis_size(adev, &nodes[i]);
amdgpu_vram_mgr_virt_start(mem, &nodes[i]);
pages_left -= pages;
}
for (; pages_left; ++i) {
unsigned long pages = min(pages_left, pages_per_node);
uint32_t alignment = mem->page_alignment;
if (pages == pages_per_node)
alignment = pages_per_node;
r = drm_mm_insert_node_in_range(mm, &nodes[i],
pages, alignment, 0,
place->fpfn, lpfn,
mode);
if (unlikely(r))
goto error;
vis_usage += amdgpu_vram_mgr_vis_size(adev, &nodes[i]);
amdgpu_vram_mgr_virt_start(mem, &nodes[i]);
pages_left -= pages;
}
spin_unlock(&mgr->lock);
atomic64_add(vis_usage, &mgr->vis_usage);
mem->mm_node = nodes;
return 0;
error:
while (i--)
drm_mm_remove_node(&nodes[i]);
spin_unlock(&mgr->lock);
atomic64_sub(mem->num_pages << PAGE_SHIFT, &mgr->usage);
kvfree(nodes);
return r == -ENOSPC ? 0 : r;
}
/**
* amdgpu_vram_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 VRAM again.
*/
static void amdgpu_vram_mgr_del(struct ttm_mem_type_manager *man,
struct ttm_mem_reg *mem)
{
struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
struct amdgpu_vram_mgr *mgr = man->priv;
struct drm_mm_node *nodes = mem->mm_node;
uint64_t usage = 0, vis_usage = 0;
unsigned pages = mem->num_pages;
if (!mem->mm_node)
return;
spin_lock(&mgr->lock);
while (pages) {
pages -= nodes->size;
drm_mm_remove_node(nodes);
usage += nodes->size << PAGE_SHIFT;
vis_usage += amdgpu_vram_mgr_vis_size(adev, nodes);
++nodes;
}
spin_unlock(&mgr->lock);
atomic64_sub(usage, &mgr->usage);
atomic64_sub(vis_usage, &mgr->vis_usage);
kvfree(mem->mm_node);
mem->mm_node = NULL;
}
/**
* amdgpu_vram_mgr_usage - how many bytes are used in this domain
*
* @man: TTM memory type manager
*
* Returns how many bytes are used in this domain.
*/
uint64_t amdgpu_vram_mgr_usage(struct ttm_mem_type_manager *man)
{
struct amdgpu_vram_mgr *mgr = man->priv;
return atomic64_read(&mgr->usage);
}
/**
* amdgpu_vram_mgr_vis_usage - how many bytes are used in the visible part
*
* @man: TTM memory type manager
*
* Returns how many bytes are used in the visible part of VRAM
*/
uint64_t amdgpu_vram_mgr_vis_usage(struct ttm_mem_type_manager *man)
{
struct amdgpu_vram_mgr *mgr = man->priv;
return atomic64_read(&mgr->vis_usage);
}
/**
* amdgpu_vram_mgr_debug - dump VRAM table
*
* @man: TTM memory type manager
* @printer: DRM printer to use
*
* Dump the table content using printk.
*/
static void amdgpu_vram_mgr_debug(struct ttm_mem_type_manager *man,
struct drm_printer *printer)
{
struct amdgpu_vram_mgr *mgr = man->priv;
spin_lock(&mgr->lock);
drm_mm_print(&mgr->mm, printer);
spin_unlock(&mgr->lock);
drm_printf(printer, "man size:%llu pages, ram usage:%lluMB, vis usage:%lluMB\n",
man->size, amdgpu_vram_mgr_usage(man) >> 20,
amdgpu_vram_mgr_vis_usage(man) >> 20);
}
const struct ttm_mem_type_manager_func amdgpu_vram_mgr_func = {
.init = amdgpu_vram_mgr_init,
.takedown = amdgpu_vram_mgr_fini,
.get_node = amdgpu_vram_mgr_new,
.put_node = amdgpu_vram_mgr_del,
.debug = amdgpu_vram_mgr_debug
};
