blob: 3a072a7a39f0faba89936f5735b349e282cf229a [file] [log] [blame]
/*
* Copyright 2017 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.
*
*/
#include "amdgpu_ids.h"
#include <linux/idr.h>
#include <linux/dma-fence-array.h>
#include <drm/drmP.h>
#include "amdgpu.h"
#include "amdgpu_trace.h"
/*
* PASID manager
*
* PASIDs are global address space identifiers that can be shared
* between the GPU, an IOMMU and the driver. VMs on different devices
* may use the same PASID if they share the same address
* space. Therefore PASIDs are allocated using a global IDA. VMs are
* looked up from the PASID per amdgpu_device.
*/
static DEFINE_IDA(amdgpu_pasid_ida);
/* Helper to free pasid from a fence callback */
struct amdgpu_pasid_cb {
struct dma_fence_cb cb;
unsigned int pasid;
};
/**
* amdgpu_pasid_alloc - Allocate a PASID
* @bits: Maximum width of the PASID in bits, must be at least 1
*
* Allocates a PASID of the given width while keeping smaller PASIDs
* available if possible.
*
* Returns a positive integer on success. Returns %-EINVAL if bits==0.
* Returns %-ENOSPC if no PASID was available. Returns %-ENOMEM on
* memory allocation failure.
*/
int amdgpu_pasid_alloc(unsigned int bits)
{
int pasid = -EINVAL;
for (bits = min(bits, 31U); bits > 0; bits--) {
pasid = ida_simple_get(&amdgpu_pasid_ida,
1U << (bits - 1), 1U << bits,
GFP_KERNEL);
if (pasid != -ENOSPC)
break;
}
if (pasid >= 0)
trace_amdgpu_pasid_allocated(pasid);
return pasid;
}
/**
* amdgpu_pasid_free - Free a PASID
* @pasid: PASID to free
*/
void amdgpu_pasid_free(unsigned int pasid)
{
trace_amdgpu_pasid_freed(pasid);
ida_simple_remove(&amdgpu_pasid_ida, pasid);
}
static void amdgpu_pasid_free_cb(struct dma_fence *fence,
struct dma_fence_cb *_cb)
{
struct amdgpu_pasid_cb *cb =
container_of(_cb, struct amdgpu_pasid_cb, cb);
amdgpu_pasid_free(cb->pasid);
dma_fence_put(fence);
kfree(cb);
}
/**
* amdgpu_pasid_free_delayed - free pasid when fences signal
*
* @resv: reservation object with the fences to wait for
* @pasid: pasid to free
*
* Free the pasid only after all the fences in resv are signaled.
*/
void amdgpu_pasid_free_delayed(struct reservation_object *resv,
unsigned int pasid)
{
struct dma_fence *fence, **fences;
struct amdgpu_pasid_cb *cb;
unsigned count;
int r;
r = reservation_object_get_fences_rcu(resv, NULL, &count, &fences);
if (r)
goto fallback;
if (count == 0) {
amdgpu_pasid_free(pasid);
return;
}
if (count == 1) {
fence = fences[0];
kfree(fences);
} else {
uint64_t context = dma_fence_context_alloc(1);
struct dma_fence_array *array;
array = dma_fence_array_create(count, fences, context,
1, false);
if (!array) {
kfree(fences);
goto fallback;
}
fence = &array->base;
}
cb = kmalloc(sizeof(*cb), GFP_KERNEL);
if (!cb) {
/* Last resort when we are OOM */
dma_fence_wait(fence, false);
dma_fence_put(fence);
amdgpu_pasid_free(pasid);
} else {
cb->pasid = pasid;
if (dma_fence_add_callback(fence, &cb->cb,
amdgpu_pasid_free_cb))
amdgpu_pasid_free_cb(fence, &cb->cb);
}
return;
fallback:
/* Not enough memory for the delayed delete, as last resort
* block for all the fences to complete.
*/
reservation_object_wait_timeout_rcu(resv, true, false,
MAX_SCHEDULE_TIMEOUT);
amdgpu_pasid_free(pasid);
}
/*
* VMID manager
*
* VMIDs are a per VMHUB identifier for page tables handling.
*/
/**
* amdgpu_vmid_had_gpu_reset - check if reset occured since last use
*
* @adev: amdgpu_device pointer
* @id: VMID structure
*
* Check if GPU reset occured since last use of the VMID.
*/
bool amdgpu_vmid_had_gpu_reset(struct amdgpu_device *adev,
struct amdgpu_vmid *id)
{
return id->current_gpu_reset_count !=
atomic_read(&adev->gpu_reset_counter);
}
/**
* amdgpu_vm_grab_idle - grab idle VMID
*
* @vm: vm to allocate id for
* @ring: ring we want to submit job to
* @sync: sync object where we add dependencies
* @idle: resulting idle VMID
*
* Try to find an idle VMID, if none is idle add a fence to wait to the sync
* object. Returns -ENOMEM when we are out of memory.
*/
static int amdgpu_vmid_grab_idle(struct amdgpu_vm *vm,
struct amdgpu_ring *ring,
struct amdgpu_sync *sync,
struct amdgpu_vmid **idle)
{
struct amdgpu_device *adev = ring->adev;
unsigned vmhub = ring->funcs->vmhub;
struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
struct dma_fence **fences;
unsigned i;
int r;
if (ring->vmid_wait && !dma_fence_is_signaled(ring->vmid_wait))
return amdgpu_sync_fence(adev, sync, ring->vmid_wait, false);
fences = kmalloc_array(sizeof(void *), id_mgr->num_ids, GFP_KERNEL);
if (!fences)
return -ENOMEM;
/* Check if we have an idle VMID */
i = 0;
list_for_each_entry((*idle), &id_mgr->ids_lru, list) {
fences[i] = amdgpu_sync_peek_fence(&(*idle)->active, ring);
if (!fences[i])
break;
++i;
}
/* If we can't find a idle VMID to use, wait till one becomes available */
if (&(*idle)->list == &id_mgr->ids_lru) {
u64 fence_context = adev->vm_manager.fence_context + ring->idx;
unsigned seqno = ++adev->vm_manager.seqno[ring->idx];
struct dma_fence_array *array;
unsigned j;
*idle = NULL;
for (j = 0; j < i; ++j)
dma_fence_get(fences[j]);
array = dma_fence_array_create(i, fences, fence_context,
seqno, true);
if (!array) {
for (j = 0; j < i; ++j)
dma_fence_put(fences[j]);
kfree(fences);
return -ENOMEM;
}
r = amdgpu_sync_fence(adev, sync, &array->base, false);
dma_fence_put(ring->vmid_wait);
ring->vmid_wait = &array->base;
return r;
}
kfree(fences);
return 0;
}
/**
* amdgpu_vm_grab_reserved - try to assign reserved VMID
*
* @vm: vm to allocate id for
* @ring: ring we want to submit job to
* @sync: sync object where we add dependencies
* @fence: fence protecting ID from reuse
* @job: job who wants to use the VMID
*
* Try to assign a reserved VMID.
*/
static int amdgpu_vmid_grab_reserved(struct amdgpu_vm *vm,
struct amdgpu_ring *ring,
struct amdgpu_sync *sync,
struct dma_fence *fence,
struct amdgpu_job *job,
struct amdgpu_vmid **id)
{
struct amdgpu_device *adev = ring->adev;
unsigned vmhub = ring->funcs->vmhub;
uint64_t fence_context = adev->fence_context + ring->idx;
struct dma_fence *updates = sync->last_vm_update;
bool needs_flush = vm->use_cpu_for_update;
int r = 0;
*id = vm->reserved_vmid[vmhub];
if (updates && (*id)->flushed_updates &&
updates->context == (*id)->flushed_updates->context &&
!dma_fence_is_later(updates, (*id)->flushed_updates))
updates = NULL;
if ((*id)->owner != vm->entity.fence_context ||
job->vm_pd_addr != (*id)->pd_gpu_addr ||
updates || !(*id)->last_flush ||
((*id)->last_flush->context != fence_context &&
!dma_fence_is_signaled((*id)->last_flush))) {
struct dma_fence *tmp;
/* to prevent one context starved by another context */
(*id)->pd_gpu_addr = 0;
tmp = amdgpu_sync_peek_fence(&(*id)->active, ring);
if (tmp) {
*id = NULL;
r = amdgpu_sync_fence(adev, sync, tmp, false);
return r;
}
needs_flush = true;
}
/* Good we can use this VMID. Remember this submission as
* user of the VMID.
*/
r = amdgpu_sync_fence(ring->adev, &(*id)->active, fence, false);
if (r)
return r;
if (updates) {
dma_fence_put((*id)->flushed_updates);
(*id)->flushed_updates = dma_fence_get(updates);
}
job->vm_needs_flush = needs_flush;
return 0;
}
/**
* amdgpu_vm_grab_used - try to reuse a VMID
*
* @vm: vm to allocate id for
* @ring: ring we want to submit job to
* @sync: sync object where we add dependencies
* @fence: fence protecting ID from reuse
* @job: job who wants to use the VMID
* @id: resulting VMID
*
* Try to reuse a VMID for this submission.
*/
static int amdgpu_vmid_grab_used(struct amdgpu_vm *vm,
struct amdgpu_ring *ring,
struct amdgpu_sync *sync,
struct dma_fence *fence,
struct amdgpu_job *job,
struct amdgpu_vmid **id)
{
struct amdgpu_device *adev = ring->adev;
unsigned vmhub = ring->funcs->vmhub;
struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
uint64_t fence_context = adev->fence_context + ring->idx;
struct dma_fence *updates = sync->last_vm_update;
int r;
job->vm_needs_flush = vm->use_cpu_for_update;
/* Check if we can use a VMID already assigned to this VM */
list_for_each_entry_reverse((*id), &id_mgr->ids_lru, list) {
bool needs_flush = vm->use_cpu_for_update;
struct dma_fence *flushed;
/* Check all the prerequisites to using this VMID */
if ((*id)->owner != vm->entity.fence_context)
continue;
if ((*id)->pd_gpu_addr != job->vm_pd_addr)
continue;
if (!(*id)->last_flush ||
((*id)->last_flush->context != fence_context &&
!dma_fence_is_signaled((*id)->last_flush)))
needs_flush = true;
flushed = (*id)->flushed_updates;
if (updates && (!flushed || dma_fence_is_later(updates, flushed)))
needs_flush = true;
/* Concurrent flushes are only possible starting with Vega10 */
if (adev->asic_type < CHIP_VEGA10 && needs_flush)
continue;
/* Good, we can use this VMID. Remember this submission as
* user of the VMID.
*/
r = amdgpu_sync_fence(ring->adev, &(*id)->active, fence, false);
if (r)
return r;
if (updates && (!flushed || dma_fence_is_later(updates, flushed))) {
dma_fence_put((*id)->flushed_updates);
(*id)->flushed_updates = dma_fence_get(updates);
}
job->vm_needs_flush |= needs_flush;
return 0;
}
*id = NULL;
return 0;
}
/**
* amdgpu_vm_grab_id - allocate the next free VMID
*
* @vm: vm to allocate id for
* @ring: ring we want to submit job to
* @sync: sync object where we add dependencies
* @fence: fence protecting ID from reuse
* @job: job who wants to use the VMID
*
* Allocate an id for the vm, adding fences to the sync obj as necessary.
*/
int amdgpu_vmid_grab(struct amdgpu_vm *vm, struct amdgpu_ring *ring,
struct amdgpu_sync *sync, struct dma_fence *fence,
struct amdgpu_job *job)
{
struct amdgpu_device *adev = ring->adev;
unsigned vmhub = ring->funcs->vmhub;
struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
struct amdgpu_vmid *idle = NULL;
struct amdgpu_vmid *id = NULL;
int r = 0;
mutex_lock(&id_mgr->lock);
r = amdgpu_vmid_grab_idle(vm, ring, sync, &idle);
if (r || !idle)
goto error;
if (vm->reserved_vmid[vmhub]) {
r = amdgpu_vmid_grab_reserved(vm, ring, sync, fence, job, &id);
if (r || !id)
goto error;
} else {
r = amdgpu_vmid_grab_used(vm, ring, sync, fence, job, &id);
if (r)
goto error;
if (!id) {
struct dma_fence *updates = sync->last_vm_update;
/* Still no ID to use? Then use the idle one found earlier */
id = idle;
/* Remember this submission as user of the VMID */
r = amdgpu_sync_fence(ring->adev, &id->active,
fence, false);
if (r)
goto error;
dma_fence_put(id->flushed_updates);
id->flushed_updates = dma_fence_get(updates);
job->vm_needs_flush = true;
}
list_move_tail(&id->list, &id_mgr->ids_lru);
}
id->pd_gpu_addr = job->vm_pd_addr;
id->owner = vm->entity.fence_context;
if (job->vm_needs_flush) {
dma_fence_put(id->last_flush);
id->last_flush = NULL;
}
job->vmid = id - id_mgr->ids;
job->pasid = vm->pasid;
trace_amdgpu_vm_grab_id(vm, ring, job);
error:
mutex_unlock(&id_mgr->lock);
return r;
}
int amdgpu_vmid_alloc_reserved(struct amdgpu_device *adev,
struct amdgpu_vm *vm,
unsigned vmhub)
{
struct amdgpu_vmid_mgr *id_mgr;
struct amdgpu_vmid *idle;
int r = 0;
id_mgr = &adev->vm_manager.id_mgr[vmhub];
mutex_lock(&id_mgr->lock);
if (vm->reserved_vmid[vmhub])
goto unlock;
if (atomic_inc_return(&id_mgr->reserved_vmid_num) >
AMDGPU_VM_MAX_RESERVED_VMID) {
DRM_ERROR("Over limitation of reserved vmid\n");
atomic_dec(&id_mgr->reserved_vmid_num);
r = -EINVAL;
goto unlock;
}
/* Select the first entry VMID */
idle = list_first_entry(&id_mgr->ids_lru, struct amdgpu_vmid, list);
list_del_init(&idle->list);
vm->reserved_vmid[vmhub] = idle;
mutex_unlock(&id_mgr->lock);
return 0;
unlock:
mutex_unlock(&id_mgr->lock);
return r;
}
void amdgpu_vmid_free_reserved(struct amdgpu_device *adev,
struct amdgpu_vm *vm,
unsigned vmhub)
{
struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
mutex_lock(&id_mgr->lock);
if (vm->reserved_vmid[vmhub]) {
list_add(&vm->reserved_vmid[vmhub]->list,
&id_mgr->ids_lru);
vm->reserved_vmid[vmhub] = NULL;
atomic_dec(&id_mgr->reserved_vmid_num);
}
mutex_unlock(&id_mgr->lock);
}
/**
* amdgpu_vmid_reset - reset VMID to zero
*
* @adev: amdgpu device structure
* @vmid: vmid number to use
*
* Reset saved GDW, GWS and OA to force switch on next flush.
*/
void amdgpu_vmid_reset(struct amdgpu_device *adev, unsigned vmhub,
unsigned vmid)
{
struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
struct amdgpu_vmid *id = &id_mgr->ids[vmid];
mutex_lock(&id_mgr->lock);
id->owner = 0;
id->gds_base = 0;
id->gds_size = 0;
id->gws_base = 0;
id->gws_size = 0;
id->oa_base = 0;
id->oa_size = 0;
mutex_unlock(&id_mgr->lock);
}
/**
* amdgpu_vmid_reset_all - reset VMID to zero
*
* @adev: amdgpu device structure
*
* Reset VMID to force flush on next use
*/
void amdgpu_vmid_reset_all(struct amdgpu_device *adev)
{
unsigned i, j;
for (i = 0; i < AMDGPU_MAX_VMHUBS; ++i) {
struct amdgpu_vmid_mgr *id_mgr =
&adev->vm_manager.id_mgr[i];
for (j = 1; j < id_mgr->num_ids; ++j)
amdgpu_vmid_reset(adev, i, j);
}
}
/**
* amdgpu_vmid_mgr_init - init the VMID manager
*
* @adev: amdgpu_device pointer
*
* Initialize the VM manager structures
*/
void amdgpu_vmid_mgr_init(struct amdgpu_device *adev)
{
unsigned i, j;
for (i = 0; i < AMDGPU_MAX_VMHUBS; ++i) {
struct amdgpu_vmid_mgr *id_mgr =
&adev->vm_manager.id_mgr[i];
mutex_init(&id_mgr->lock);
INIT_LIST_HEAD(&id_mgr->ids_lru);
atomic_set(&id_mgr->reserved_vmid_num, 0);
/* skip over VMID 0, since it is the system VM */
for (j = 1; j < id_mgr->num_ids; ++j) {
amdgpu_vmid_reset(adev, i, j);
amdgpu_sync_create(&id_mgr->ids[i].active);
list_add_tail(&id_mgr->ids[j].list, &id_mgr->ids_lru);
}
}
}
/**
* amdgpu_vmid_mgr_fini - cleanup VM manager
*
* @adev: amdgpu_device pointer
*
* Cleanup the VM manager and free resources.
*/
void amdgpu_vmid_mgr_fini(struct amdgpu_device *adev)
{
unsigned i, j;
for (i = 0; i < AMDGPU_MAX_VMHUBS; ++i) {
struct amdgpu_vmid_mgr *id_mgr =
&adev->vm_manager.id_mgr[i];
mutex_destroy(&id_mgr->lock);
for (j = 0; j < AMDGPU_NUM_VMID; ++j) {
struct amdgpu_vmid *id = &id_mgr->ids[j];
amdgpu_sync_free(&id->active);
dma_fence_put(id->flushed_updates);
dma_fence_put(id->last_flush);
dma_fence_put(id->pasid_mapping);
}
}
}