/*
* Copyright 2014 Advanced Micro Devices, 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:
* Christian König <christian.koenig@amd.com>
*/
#include <drm/drmP.h>
#include "amdgpu.h"
#include "amdgpu_trace.h"
struct amdgpu_sync_entry {
struct hlist_node node;
struct fence *fence;
};
static struct kmem_cache *amdgpu_sync_slab;
/**
* amdgpu_sync_create - zero init sync object
*
* @sync: sync object to initialize
*
* Just clear the sync object for now.
*/
void amdgpu_sync_create(struct amdgpu_sync *sync)
{
hash_init(sync->fences);
sync->last_vm_update = NULL;
}
/**
* amdgpu_sync_same_dev - test if fence belong to us
*
* @adev: amdgpu device to use for the test
* @f: fence to test
*
* Test if the fence was issued by us.
*/
static bool amdgpu_sync_same_dev(struct amdgpu_device *adev, struct fence *f)
{
struct amd_sched_fence *s_fence = to_amd_sched_fence(f);
if (s_fence) {
struct amdgpu_ring *ring;
ring = container_of(s_fence->sched, struct amdgpu_ring, sched);
return ring->adev == adev;
}
return false;
}
/**
* amdgpu_sync_get_owner - extract the owner of a fence
*
* @fence: fence get the owner from
*
* Extract who originally created the fence.
*/
static void *amdgpu_sync_get_owner(struct fence *f)
{
struct amd_sched_fence *s_fence = to_amd_sched_fence(f);
if (s_fence)
return s_fence->owner;
return AMDGPU_FENCE_OWNER_UNDEFINED;
}
/**
* amdgpu_sync_keep_later - Keep the later fence
*
* @keep: existing fence to test
* @fence: new fence
*
* Either keep the existing fence or the new one, depending which one is later.
*/
static void amdgpu_sync_keep_later(struct fence **keep, struct fence *fence)
{
if (*keep && fence_is_later(*keep, fence))
return;
fence_put(*keep);
*keep = fence_get(fence);
}
/**
* amdgpu_sync_add_later - add the fence to the hash
*
* @sync: sync object to add the fence to
* @f: fence to add
*
* Tries to add the fence to an existing hash entry. Returns true when an entry
* was found, false otherwise.
*/
static bool amdgpu_sync_add_later(struct amdgpu_sync *sync, struct fence *f)
{
struct amdgpu_sync_entry *e;
hash_for_each_possible(sync->fences, e, node, f->context) {
if (unlikely(e->fence->context != f->context))
continue;
amdgpu_sync_keep_later(&e->fence, f);
return true;
}
return false;
}
/**
* amdgpu_sync_fence - remember to sync to this fence
*
* @sync: sync object to add fence to
* @fence: fence to sync to
*
*/
int amdgpu_sync_fence(struct amdgpu_device *adev, struct amdgpu_sync *sync,
struct fence *f)
{
struct amdgpu_sync_entry *e;
if (!f)
return 0;
if (amdgpu_sync_same_dev(adev, f) &&
amdgpu_sync_get_owner(f) == AMDGPU_FENCE_OWNER_VM)
amdgpu_sync_keep_later(&sync->last_vm_update, f);
if (amdgpu_sync_add_later(sync, f))
return 0;
e = kmem_cache_alloc(amdgpu_sync_slab, GFP_KERNEL);
if (!e)
return -ENOMEM;
hash_add(sync->fences, &e->node, f->context);
e->fence = fence_get(f);
return 0;
}
/**
* amdgpu_sync_resv - sync to a reservation object
*
* @sync: sync object to add fences from reservation object to
* @resv: reservation object with embedded fence
* @shared: true if we should only sync to the exclusive fence
*
* Sync to the fence
*/
int amdgpu_sync_resv(struct amdgpu_device *adev,
struct amdgpu_sync *sync,
struct reservation_object *resv,
void *owner)
{
struct reservation_object_list *flist;
struct fence *f;
void *fence_owner;
unsigned i;
int r = 0;
if (resv == NULL)
return -EINVAL;
/* always sync to the exclusive fence */
f = reservation_object_get_excl(resv);
r = amdgpu_sync_fence(adev, sync, f);
flist = reservation_object_get_list(resv);
if (!flist || r)
return r;
for (i = 0; i < flist->shared_count; ++i) {
f = rcu_dereference_protected(flist->shared[i],
reservation_object_held(resv));
if (amdgpu_sync_same_dev(adev, f)) {
/* VM updates are only interesting
* for other VM updates and moves.
*/
fence_owner = amdgpu_sync_get_owner(f);
if ((owner != AMDGPU_FENCE_OWNER_UNDEFINED) &&
(fence_owner != AMDGPU_FENCE_OWNER_UNDEFINED) &&
((owner == AMDGPU_FENCE_OWNER_VM) !=
(fence_owner == AMDGPU_FENCE_OWNER_VM)))
continue;
/* Ignore fence from the same owner as
* long as it isn't undefined.
*/
if (owner != AMDGPU_FENCE_OWNER_UNDEFINED &&
fence_owner == owner)
continue;
}
r = amdgpu_sync_fence(adev, sync, f);
if (r)
break;
}
return r;
}
/**
* amdgpu_sync_peek_fence - get the next fence not signaled yet
*
* @sync: the sync object
* @ring: optional ring to use for test
*
* Returns the next fence not signaled yet without removing it from the sync
* object.
*/
struct fence *amdgpu_sync_peek_fence(struct amdgpu_sync *sync,
struct amdgpu_ring *ring)
{
struct amdgpu_sync_entry *e;
struct hlist_node *tmp;
int i;
hash_for_each_safe(sync->fences, i, tmp, e, node) {
struct fence *f = e->fence;
struct amd_sched_fence *s_fence = to_amd_sched_fence(f);
if (ring && s_fence) {
/* For fences from the same ring it is sufficient
* when they are scheduled.
*/
if (s_fence->sched == &ring->sched) {
if (fence_is_signaled(&s_fence->scheduled))
continue;
return &s_fence->scheduled;
}
}
if (fence_is_signaled(f)) {
hash_del(&e->node);
fence_put(f);
kmem_cache_free(amdgpu_sync_slab, e);
continue;
}
return f;
}
return NULL;
}
/**
* amdgpu_sync_get_fence - get the next fence from the sync object
*
* @sync: sync object to use
*
* Get and removes the next fence from the sync object not signaled yet.
*/
struct fence *amdgpu_sync_get_fence(struct amdgpu_sync *sync)
{
struct amdgpu_sync_entry *e;
struct hlist_node *tmp;
struct fence *f;
int i;
hash_for_each_safe(sync->fences, i, tmp, e, node) {
f = e->fence;
hash_del(&e->node);
kmem_cache_free(amdgpu_sync_slab, e);
if (!fence_is_signaled(f))
return f;
fence_put(f);
}
return NULL;
}
/**
* amdgpu_sync_free - free the sync object
*
* @sync: sync object to use
*
* Free the sync object.
*/
void amdgpu_sync_free(struct amdgpu_sync *sync)
{
struct amdgpu_sync_entry *e;
struct hlist_node *tmp;
unsigned i;
hash_for_each_safe(sync->fences, i, tmp, e, node) {
hash_del(&e->node);
fence_put(e->fence);
kmem_cache_free(amdgpu_sync_slab, e);
}
fence_put(sync->last_vm_update);
}
/**
* amdgpu_sync_init - init sync object subsystem
*
* Allocate the slab allocator.
*/
int amdgpu_sync_init(void)
{
amdgpu_sync_slab = kmem_cache_create(
"amdgpu_sync", sizeof(struct amdgpu_sync_entry), 0,
SLAB_HWCACHE_ALIGN, NULL);
if (!amdgpu_sync_slab)
return -ENOMEM;
return 0;
}
/**
* amdgpu_sync_fini - fini sync object subsystem
*
* Free the slab allocator.
*/
void amdgpu_sync_fini(void)
{
kmem_cache_destroy(amdgpu_sync_slab);
}
