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/*
* Copyright 2011 Red Hat Inc.
* All Rights Reserved.
*
* 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, sub license, 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 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 NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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.
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
*/
/*
* Authors:
* Jerome Glisse <glisse@freedesktop.org>
*/
/* Algorithm:
*
* We store the last allocated bo in "hole", we always try to allocate
* after the last allocated bo. Principle is that in a linear GPU ring
* progression was is after last is the oldest bo we allocated and thus
* the first one that should no longer be in use by the GPU.
*
* If it's not the case we skip over the bo after last to the closest
* done bo if such one exist. If none exist and we are not asked to
* block we report failure to allocate.
*
* If we are asked to block we wait on all the oldest fence of all
* rings. We just wait for any of those fence to complete.
*/
#include "amdgpu.h"
static void amdgpu_sa_bo_remove_locked(struct amdgpu_sa_bo *sa_bo);
static void amdgpu_sa_bo_try_free(struct amdgpu_sa_manager *sa_manager);
int amdgpu_sa_bo_manager_init(struct amdgpu_device *adev,
struct amdgpu_sa_manager *sa_manager,
unsigned size, u32 align, u32 domain)
{
int i, r;
init_waitqueue_head(&sa_manager->wq);
sa_manager->bo = NULL;
sa_manager->size = size;
sa_manager->domain = domain;
sa_manager->align = align;
sa_manager->hole = &sa_manager->olist;
INIT_LIST_HEAD(&sa_manager->olist);
for (i = 0; i < AMDGPU_SA_NUM_FENCE_LISTS; ++i)
INIT_LIST_HEAD(&sa_manager->flist[i]);
r = amdgpu_bo_create_kernel(adev, size, align, domain, &sa_manager->bo,
&sa_manager->gpu_addr, &sa_manager->cpu_ptr);
if (r) {
dev_err(adev->dev, "(%d) failed to allocate bo for manager\n", r);
return r;
}
memset(sa_manager->cpu_ptr, 0, sa_manager->size);
return r;
}
void amdgpu_sa_bo_manager_fini(struct amdgpu_device *adev,
struct amdgpu_sa_manager *sa_manager)
{
struct amdgpu_sa_bo *sa_bo, *tmp;
if (sa_manager->bo == NULL) {
dev_err(adev->dev, "no bo for sa manager\n");
return;
}
if (!list_empty(&sa_manager->olist)) {
sa_manager->hole = &sa_manager->olist,
amdgpu_sa_bo_try_free(sa_manager);
if (!list_empty(&sa_manager->olist)) {
dev_err(adev->dev, "sa_manager is not empty, clearing anyway\n");
}
}
list_for_each_entry_safe(sa_bo, tmp, &sa_manager->olist, olist) {
amdgpu_sa_bo_remove_locked(sa_bo);
}
amdgpu_bo_free_kernel(&sa_manager->bo, &sa_manager->gpu_addr, &sa_manager->cpu_ptr);
sa_manager->size = 0;
}
static void amdgpu_sa_bo_remove_locked(struct amdgpu_sa_bo *sa_bo)
{
struct amdgpu_sa_manager *sa_manager = sa_bo->manager;
if (sa_manager->hole == &sa_bo->olist) {
sa_manager->hole = sa_bo->olist.prev;
}
list_del_init(&sa_bo->olist);
list_del_init(&sa_bo->flist);
dma_fence_put(sa_bo->fence);
kfree(sa_bo);
}
static void amdgpu_sa_bo_try_free(struct amdgpu_sa_manager *sa_manager)
{
struct amdgpu_sa_bo *sa_bo, *tmp;
if (sa_manager->hole->next == &sa_manager->olist)
return;
sa_bo = list_entry(sa_manager->hole->next, struct amdgpu_sa_bo, olist);
list_for_each_entry_safe_from(sa_bo, tmp, &sa_manager->olist, olist) {
if (sa_bo->fence == NULL ||
!dma_fence_is_signaled(sa_bo->fence)) {
return;
}
amdgpu_sa_bo_remove_locked(sa_bo);
}
}
static inline unsigned amdgpu_sa_bo_hole_soffset(struct amdgpu_sa_manager *sa_manager)
{
struct list_head *hole = sa_manager->hole;
if (hole != &sa_manager->olist) {
return list_entry(hole, struct amdgpu_sa_bo, olist)->eoffset;
}
return 0;
}
static inline unsigned amdgpu_sa_bo_hole_eoffset(struct amdgpu_sa_manager *sa_manager)
{
struct list_head *hole = sa_manager->hole;
if (hole->next != &sa_manager->olist) {
return list_entry(hole->next, struct amdgpu_sa_bo, olist)->soffset;
}
return sa_manager->size;
}
static bool amdgpu_sa_bo_try_alloc(struct amdgpu_sa_manager *sa_manager,
struct amdgpu_sa_bo *sa_bo,
unsigned size, unsigned align)
{
unsigned soffset, eoffset, wasted;
soffset = amdgpu_sa_bo_hole_soffset(sa_manager);
eoffset = amdgpu_sa_bo_hole_eoffset(sa_manager);
wasted = (align - (soffset % align)) % align;
if ((eoffset - soffset) >= (size + wasted)) {
soffset += wasted;
sa_bo->manager = sa_manager;
sa_bo->soffset = soffset;
sa_bo->eoffset = soffset + size;
list_add(&sa_bo->olist, sa_manager->hole);
INIT_LIST_HEAD(&sa_bo->flist);
sa_manager->hole = &sa_bo->olist;
return true;
}
return false;
}
/**
* amdgpu_sa_event - Check if we can stop waiting
*
* @sa_manager: pointer to the sa_manager
* @size: number of bytes we want to allocate
* @align: alignment we need to match
*
* Check if either there is a fence we can wait for or
* enough free memory to satisfy the allocation directly
*/
static bool amdgpu_sa_event(struct amdgpu_sa_manager *sa_manager,
unsigned size, unsigned align)
{
unsigned soffset, eoffset, wasted;
int i;
for (i = 0; i < AMDGPU_SA_NUM_FENCE_LISTS; ++i)
if (!list_empty(&sa_manager->flist[i]))
return true;
soffset = amdgpu_sa_bo_hole_soffset(sa_manager);
eoffset = amdgpu_sa_bo_hole_eoffset(sa_manager);
wasted = (align - (soffset % align)) % align;
if ((eoffset - soffset) >= (size + wasted)) {
return true;
}
return false;
}
static bool amdgpu_sa_bo_next_hole(struct amdgpu_sa_manager *sa_manager,
struct dma_fence **fences,
unsigned *tries)
{
struct amdgpu_sa_bo *best_bo = NULL;
unsigned i, soffset, best, tmp;
/* if hole points to the end of the buffer */
if (sa_manager->hole->next == &sa_manager->olist) {
/* try again with its beginning */
sa_manager->hole = &sa_manager->olist;
return true;
}
soffset = amdgpu_sa_bo_hole_soffset(sa_manager);
/* to handle wrap around we add sa_manager->size */
best = sa_manager->size * 2;
/* go over all fence list and try to find the closest sa_bo
* of the current last
*/
for (i = 0; i < AMDGPU_SA_NUM_FENCE_LISTS; ++i) {
struct amdgpu_sa_bo *sa_bo;
fences[i] = NULL;
if (list_empty(&sa_manager->flist[i]))
continue;
sa_bo = list_first_entry(&sa_manager->flist[i],
struct amdgpu_sa_bo, flist);
if (!dma_fence_is_signaled(sa_bo->fence)) {
fences[i] = sa_bo->fence;
continue;
}
/* limit the number of tries each ring gets */
if (tries[i] > 2) {
continue;
}
tmp = sa_bo->soffset;
if (tmp < soffset) {
/* wrap around, pretend it's after */
tmp += sa_manager->size;
}
tmp -= soffset;
if (tmp < best) {
/* this sa bo is the closest one */
best = tmp;
best_bo = sa_bo;
}
}
if (best_bo) {
uint32_t idx = best_bo->fence->context;
idx %= AMDGPU_SA_NUM_FENCE_LISTS;
++tries[idx];
sa_manager->hole = best_bo->olist.prev;
/* we knew that this one is signaled,
so it's save to remote it */
amdgpu_sa_bo_remove_locked(best_bo);
return true;
}
return false;
}
int amdgpu_sa_bo_new(struct amdgpu_sa_manager *sa_manager,
struct amdgpu_sa_bo **sa_bo,
unsigned size, unsigned align)
{
struct dma_fence *fences[AMDGPU_SA_NUM_FENCE_LISTS];
unsigned tries[AMDGPU_SA_NUM_FENCE_LISTS];
unsigned count;
int i, r;
signed long t;
if (WARN_ON_ONCE(align > sa_manager->align))
return -EINVAL;
if (WARN_ON_ONCE(size > sa_manager->size))
return -EINVAL;
*sa_bo = kmalloc(sizeof(struct amdgpu_sa_bo), GFP_KERNEL);
if (!(*sa_bo))
return -ENOMEM;
(*sa_bo)->manager = sa_manager;
(*sa_bo)->fence = NULL;
INIT_LIST_HEAD(&(*sa_bo)->olist);
INIT_LIST_HEAD(&(*sa_bo)->flist);
spin_lock(&sa_manager->wq.lock);
do {
for (i = 0; i < AMDGPU_SA_NUM_FENCE_LISTS; ++i)
tries[i] = 0;
do {
amdgpu_sa_bo_try_free(sa_manager);
if (amdgpu_sa_bo_try_alloc(sa_manager, *sa_bo,
size, align)) {
spin_unlock(&sa_manager->wq.lock);
return 0;
}
/* see if we can skip over some allocations */
} while (amdgpu_sa_bo_next_hole(sa_manager, fences, tries));
for (i = 0, count = 0; i < AMDGPU_SA_NUM_FENCE_LISTS; ++i)
if (fences[i])
fences[count++] = dma_fence_get(fences[i]);
if (count) {
spin_unlock(&sa_manager->wq.lock);
t = dma_fence_wait_any_timeout(fences, count, false,
MAX_SCHEDULE_TIMEOUT,
NULL);
for (i = 0; i < count; ++i)
dma_fence_put(fences[i]);
r = (t > 0) ? 0 : t;
spin_lock(&sa_manager->wq.lock);
} else {
/* if we have nothing to wait for block */
r = wait_event_interruptible_locked(
sa_manager->wq,
amdgpu_sa_event(sa_manager, size, align)
);
}
} while (!r);
spin_unlock(&sa_manager->wq.lock);
kfree(*sa_bo);
*sa_bo = NULL;
return r;
}
void amdgpu_sa_bo_free(struct amdgpu_device *adev, struct amdgpu_sa_bo **sa_bo,
struct dma_fence *fence)
{
struct amdgpu_sa_manager *sa_manager;
if (sa_bo == NULL || *sa_bo == NULL) {
return;
}
sa_manager = (*sa_bo)->manager;
spin_lock(&sa_manager->wq.lock);
if (fence && !dma_fence_is_signaled(fence)) {
uint32_t idx;
(*sa_bo)->fence = dma_fence_get(fence);
idx = fence->context % AMDGPU_SA_NUM_FENCE_LISTS;
list_add_tail(&(*sa_bo)->flist, &sa_manager->flist[idx]);
} else {
amdgpu_sa_bo_remove_locked(*sa_bo);
}
wake_up_all_locked(&sa_manager->wq);
spin_unlock(&sa_manager->wq.lock);
*sa_bo = NULL;
}
#if defined(CONFIG_DEBUG_FS)
void amdgpu_sa_bo_dump_debug_info(struct amdgpu_sa_manager *sa_manager,
struct seq_file *m)
{
struct amdgpu_sa_bo *i;
spin_lock(&sa_manager->wq.lock);
list_for_each_entry(i, &sa_manager->olist, olist) {
uint64_t soffset = i->soffset + sa_manager->gpu_addr;
uint64_t eoffset = i->eoffset + sa_manager->gpu_addr;
if (&i->olist == sa_manager->hole) {
seq_printf(m, ">");
} else {
seq_printf(m, " ");
}
seq_printf(m, "[0x%010llx 0x%010llx] size %8lld",
soffset, eoffset, eoffset - soffset);
if (i->fence)
seq_printf(m, " protected by 0x%016llx on context %llu",
i->fence->seqno, i->fence->context);
seq_printf(m, "\n");
}
spin_unlock(&sa_manager->wq.lock);
}
#endif