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amdgpu: get rid of IB pool management v3 

v1: by Jammy Zhou
v2: remove bo wait when destroy IB by Jammy Zhou
v3: more cleanups by Marek

Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
main
Jammy Zhou 2015-05-29 12:59:59 +02:00 committed by Alex Deucher
parent ef9aa370bb
commit 40c5336043
3 changed files with 14 additions and 455 deletions
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19
amdgpu/amdgpu.h
View File

@ -56,14 +56,6 @@ struct drm_amdgpu_info_hw_ip;
*/ */
#define AMDGPU_TIMEOUT_INFINITE 0xffffffffffffffffull #define AMDGPU_TIMEOUT_INFINITE 0xffffffffffffffffull
/**
* The special flag to mark that this IB will re-used
* by client and should not be automatically return back
* to free pool by libdrm_amdgpu when submission is completed.
*
* \sa amdgpu_cs_ib_info
*/
#define AMDGPU_CS_REUSE_IB 0x2
/*--------------------------------------------------------------------------*/ /*--------------------------------------------------------------------------*/
/* ----------------------------- Enums ------------------------------------ */ /* ----------------------------- Enums ------------------------------------ */
@ -969,9 +961,6 @@ int amdgpu_cs_alloc_ib(amdgpu_context_handle context,
* >0 - AMD specific error code\n * >0 - AMD specific error code\n
* <0 - Negative POSIX Error code * <0 - Negative POSIX Error code
* *
* \note Libdrm_amdgpu will guarantee that it will correctly detect when it
* is safe to return IB to free pool
*
* \sa amdgpu_cs_alloc_ib() * \sa amdgpu_cs_alloc_ib()
* *
*/ */
@ -1007,14 +996,6 @@ int amdgpu_cs_free_ib(amdgpu_ib_handle handle);
* >0 - AMD specific error code\n * >0 - AMD specific error code\n
* <0 - Negative POSIX Error code * <0 - Negative POSIX Error code
* *
* \note It is assumed that by default IB will be returned to free pool
* automatically by libdrm_amdgpu when submission will completed.
* It is possible for UMD to make decision to re-use the same IB in
* this case it should be explicitly freed.\n
* Accordingly, by default, after submission UMD should not touch passed
* IBs. If UMD needs to re-use IB then the special flag AMDGPU_CS_REUSE_IB
* must be passed.
*
* \note It is required to pass correct resource list with buffer handles * \note It is required to pass correct resource list with buffer handles
* which will be accessible by command buffers from submission * which will be accessible by command buffers from submission
* This will allow kernel driver to correctly implement "paging". * This will allow kernel driver to correctly implement "paging".

426
amdgpu/amdgpu_cs.c
View File

@ -75,7 +75,6 @@ static int amdgpu_cs_create_ib(amdgpu_context_handle context,
} }
alloc_buffer.phys_alignment = 4 * 1024; alloc_buffer.phys_alignment = 4 * 1024;
alloc_buffer.preferred_heap = AMDGPU_GEM_DOMAIN_GTT; alloc_buffer.preferred_heap = AMDGPU_GEM_DOMAIN_GTT;
r = amdgpu_bo_alloc(context->dev, r = amdgpu_bo_alloc(context->dev,
@ -101,7 +100,6 @@ static int amdgpu_cs_create_ib(amdgpu_context_handle context,
new_ib->buf_handle = info.buf_handle; new_ib->buf_handle = info.buf_handle;
new_ib->cpu = cpu; new_ib->cpu = cpu;
new_ib->virtual_mc_base_address = info.virtual_mc_base_address; new_ib->virtual_mc_base_address = info.virtual_mc_base_address;
new_ib->ib_size = ib_size;
*ib = new_ib; *ib = new_ib;
return 0; return 0;
} }
@ -109,15 +107,17 @@ static int amdgpu_cs_create_ib(amdgpu_context_handle context,
/** /**
* Destroy an IB buffer. * Destroy an IB buffer.
* *
* \param dev - \c [in] Device handle * \param ib - \c [in] IB handle
* \param ib - \c [in] the IB buffer
* *
* \return 0 on success otherwise POSIX Error code * \return 0 on success otherwise POSIX Error code
*/ */
static int amdgpu_cs_destroy_ib(amdgpu_ib_handle ib) int amdgpu_cs_free_ib(amdgpu_ib_handle ib)
{ {
int r; int r;
if (!ib)
return -EINVAL;
r = amdgpu_bo_cpu_unmap(ib->buf_handle); r = amdgpu_bo_cpu_unmap(ib->buf_handle);
if (r) if (r)
return r; return r;
@ -130,344 +130,6 @@ static int amdgpu_cs_destroy_ib(amdgpu_ib_handle ib)
return 0; return 0;
} }
/**
* Initialize IB pools to empty.
*
* \param context - \c [in] GPU Context
*
* \return 0 on success otherwise POSIX Error code
*/
static int amdgpu_cs_init_ib_pool(amdgpu_context_handle context)
{
int i;
int r;
r = pthread_mutex_init(&context->pool_mutex, NULL);
if (r)
return r;
for (i = 0; i < AMDGPU_CS_IB_SIZE_NUM; i++)
LIST_INITHEAD(&context->ib_pools[i]);
return 0;
}
/**
* Allocate an IB buffer from IB pools.
*
* \param dev - \c [in] Device handle
* \param context - \c [in] GPU Context
* \param ib_size - \c [in] Size of allocation
* \param ib - \c [out] return the pointer to the allocated IB buffer
*
* \return 0 on success otherwise POSIX Error code
*/
static int amdgpu_cs_alloc_from_ib_pool(amdgpu_context_handle context,
enum amdgpu_cs_ib_size ib_size,
amdgpu_ib_handle *ib)
{
int r;
struct list_head *head;
head = &context->ib_pools[ib_size];
r = -ENOMEM;
pthread_mutex_lock(&context->pool_mutex);
if (!LIST_IS_EMPTY(head)) {
*ib = LIST_ENTRY(struct amdgpu_ib, head->next, list_node);
LIST_DEL(&(*ib)->list_node);
r = 0;
}
pthread_mutex_unlock(&context->pool_mutex);
return r;
}
/**
* Free an IB buffer to IB pools.
*
* \param context - \c [in] GPU Context
* \param ib - \c [in] the IB buffer
*
* \return N/A
*/
static void amdgpu_cs_free_to_ib_pool(amdgpu_context_handle context,
amdgpu_ib_handle ib)
{
struct list_head *head;
head = &context->ib_pools[ib->ib_size];
pthread_mutex_lock(&context->pool_mutex);
LIST_ADD(&ib->list_node, head);
pthread_mutex_unlock(&context->pool_mutex);
return;
}
/**
* Destroy all IB buffers in pools
*
* \param dev - \c [in] Device handle
* \param context - \c [in] GPU Context
*
* \return 0 on success otherwise POSIX Error code
*/
static int amdgpu_cs_destroy_ib_pool(amdgpu_context_handle context)
{
struct list_head *head;
struct amdgpu_ib *next;
struct amdgpu_ib *storage;
int i, r;
r = 0;
pthread_mutex_lock(&context->pool_mutex);
for (i = 0; i < AMDGPU_CS_IB_SIZE_NUM; i++) {
head = &context->ib_pools[i];
LIST_FOR_EACH_ENTRY_SAFE(next, storage, head, list_node) {
r = amdgpu_cs_destroy_ib(next);
if (r)
break;
}
}
pthread_mutex_unlock(&context->pool_mutex);
pthread_mutex_destroy(&context->pool_mutex);
return r;
}
/**
* Initialize pending IB lists
*
* \param context - \c [in] GPU Context
*
* \return 0 on success otherwise POSIX Error code
*/
static int amdgpu_cs_init_pendings(amdgpu_context_handle context)
{
unsigned ip, inst;
uint32_t ring;
int r;
r = pthread_mutex_init(&context->pendings_mutex, NULL);
if (r)
return r;
for (ip = 0; ip < AMDGPU_HW_IP_NUM; ip++)
for (inst = 0; inst < AMDGPU_HW_IP_INSTANCE_MAX_COUNT; inst++)
for (ring = 0; ring < AMDGPU_CS_MAX_RINGS; ring++)
LIST_INITHEAD(&context->pendings[ip][inst][ring]);
LIST_INITHEAD(&context->freed);
return 0;
}
/**
* Free pending IBs
*
* \param dev - \c [in] Device handle
* \param context - \c [in] GPU Context
*
* \return 0 on success otherwise POSIX Error code
*/
static int amdgpu_cs_destroy_pendings(amdgpu_context_handle context)
{
int ip, inst;
uint32_t ring;
int r;
struct amdgpu_ib *next;
struct amdgpu_ib *s;
struct list_head *head;
r = 0;
pthread_mutex_lock(&context->pendings_mutex);
for (ip = 0; ip < AMDGPU_HW_IP_NUM; ip++)
for (inst = 0; inst < AMDGPU_HW_IP_INSTANCE_MAX_COUNT; inst++)
for (ring = 0; ring < AMDGPU_CS_MAX_RINGS; ring++) {
head = &context->pendings[ip][inst][ring];
LIST_FOR_EACH_ENTRY_SAFE(next, s, head, list_node) {
r = amdgpu_cs_destroy_ib(next);
if (r)
break;
}
}
head = &context->freed;
LIST_FOR_EACH_ENTRY_SAFE(next, s, head, list_node) {
r = amdgpu_cs_destroy_ib(next);
if (r)
break;
}
pthread_mutex_unlock(&context->pendings_mutex);
pthread_mutex_destroy(&context->pendings_mutex);
return r;
}
/**
* Add IB to pending IB lists without holding sequence_mutex.
*
* \param context - \c [in] GPU Context
* \param ib - \c [in] ib to added to pending lists
* \param ip - \c [in] hw ip block
* \param ip_instance - \c [in] instance of the hw ip block
* \param ring - \c [in] Ring of hw ip
*
* \return N/A
*/
static void amdgpu_cs_add_pending(amdgpu_context_handle context,
amdgpu_ib_handle ib,
unsigned ip, unsigned ip_instance,
uint32_t ring)
{
struct list_head *head;
struct amdgpu_ib *next;
struct amdgpu_ib *s;
pthread_mutex_lock(&context->pendings_mutex);
head = &context->pendings[ip][ip_instance][ring];
LIST_FOR_EACH_ENTRY_SAFE(next, s, head, list_node)
if (next == ib) {
pthread_mutex_unlock(&context->pendings_mutex);
return;
}
LIST_ADDTAIL(&ib->list_node, head);
pthread_mutex_unlock(&context->pendings_mutex);
return;
}
/**
* Garbage collector on a pending IB list without holding pendings_mutex.
* This function by itself is not multithread safe.
*
* \param context - \c [in] GPU Context
* \param ip - \c [in] hw ip block
* \param ip_instance - \c [in] instance of the hw ip block
* \param ring - \c [in] Ring of hw ip
* \param expired_fence - \c [in] fence expired
*
* \return N/A
* \note Hold pendings_mutex before calling this function.
*/
static void amdgpu_cs_pending_gc_not_safe(amdgpu_context_handle context,
unsigned ip, unsigned ip_instance,
uint32_t ring,
uint64_t expired_fence)
{
struct list_head *head;
struct amdgpu_ib *next;
struct amdgpu_ib *s;
int r;
head = &context->pendings[ip][ip_instance][ring];
LIST_FOR_EACH_ENTRY_SAFE(next, s, head, list_node)
if (next->cs_handle <= expired_fence) {
LIST_DEL(&next->list_node);
amdgpu_cs_free_to_ib_pool(context, next);
} else {
/* The pending list is a sorted list.
There is no need to continue. */
break;
}
/* walk the freed list as well */
head = &context->freed;
LIST_FOR_EACH_ENTRY_SAFE(next, s, head, list_node) {
bool busy;
r = amdgpu_bo_wait_for_idle(next->buf_handle, 0, &busy);
if (r || busy)
break;
LIST_DEL(&next->list_node);
amdgpu_cs_free_to_ib_pool(context, next);
}
return;
}
/**
* Garbage collector on a pending IB list
*
* \param context - \c [in] GPU Context
* \param ip - \c [in] hw ip block
* \param ip_instance - \c [in] instance of the hw ip block
* \param ring - \c [in] Ring of hw ip
* \param expired_fence - \c [in] fence expired
*
* \return N/A
*/
static void amdgpu_cs_pending_gc(amdgpu_context_handle context,
unsigned ip, unsigned ip_instance,
uint32_t ring,
uint64_t expired_fence)
{
pthread_mutex_lock(&context->pendings_mutex);
amdgpu_cs_pending_gc_not_safe(context, ip, ip_instance, ring,
expired_fence);
pthread_mutex_unlock(&context->pendings_mutex);
return;
}
/**
* Garbage collector on all pending IB lists
*
* \param context - \c [in] GPU Context
*
* \return N/A
*/
static void amdgpu_cs_all_pending_gc(amdgpu_context_handle context)
{
unsigned ip, inst;
uint32_t ring;
uint64_t expired_fences[AMDGPU_HW_IP_NUM][AMDGPU_HW_IP_INSTANCE_MAX_COUNT][AMDGPU_CS_MAX_RINGS];
pthread_mutex_lock(&context->sequence_mutex);
for (ip = 0; ip < AMDGPU_HW_IP_NUM; ip++)
for (inst = 0; inst < AMDGPU_HW_IP_INSTANCE_MAX_COUNT; inst++)
for (ring = 0; ring < AMDGPU_CS_MAX_RINGS; ring++)
expired_fences[ip][inst][ring] =
context->expired_fences[ip][inst][ring];
pthread_mutex_unlock(&context->sequence_mutex);
pthread_mutex_lock(&context->pendings_mutex);
for (ip = 0; ip < AMDGPU_HW_IP_NUM; ip++)
for (inst = 0; inst < AMDGPU_HW_IP_INSTANCE_MAX_COUNT; inst++)
for (ring = 0; ring < AMDGPU_CS_MAX_RINGS; ring++)
amdgpu_cs_pending_gc_not_safe(context, ip, inst, ring,
expired_fences[ip][inst][ring]);
pthread_mutex_unlock(&context->pendings_mutex);
}
/**
* Allocate an IB buffer
* If there is no free IB buffer in pools, create one.
*
* \param dev - \c [in] Device handle
* \param context - \c [in] GPU Context
* \param ib_size - \c [in] Size of allocation
* \param ib - \c [out] return the pointer to the allocated IB buffer
*
* \return 0 on success otherwise POSIX Error code
*/
static int amdgpu_cs_alloc_ib_local(amdgpu_context_handle context,
enum amdgpu_cs_ib_size ib_size,
amdgpu_ib_handle *ib)
{
int r;
r = amdgpu_cs_alloc_from_ib_pool(context, ib_size, ib);
if (!r)
return r;
amdgpu_cs_all_pending_gc(context);
/* Retry to allocate from free IB pools after garbage collector. */
r = amdgpu_cs_alloc_from_ib_pool(context, ib_size, ib);
if (!r)
return r;
/* There is no suitable IB in free pools. Create one. */
r = amdgpu_cs_create_ib(context, ib_size, ib);
return r;
}
int amdgpu_cs_alloc_ib(amdgpu_context_handle context, int amdgpu_cs_alloc_ib(amdgpu_context_handle context,
enum amdgpu_cs_ib_size ib_size, enum amdgpu_cs_ib_size ib_size,
struct amdgpu_cs_ib_alloc_result *output) struct amdgpu_cs_ib_alloc_result *output)
@ -482,7 +144,7 @@ int amdgpu_cs_alloc_ib(amdgpu_context_handle context,
if (ib_size >= AMDGPU_CS_IB_SIZE_NUM) if (ib_size >= AMDGPU_CS_IB_SIZE_NUM)
return -EINVAL; return -EINVAL;
r = amdgpu_cs_alloc_ib_local(context, ib_size, &ib); r = amdgpu_cs_create_ib(context, ib_size, &ib);
if (!r) { if (!r) {
output->handle = ib; output->handle = ib;
output->cpu = ib->cpu; output->cpu = ib->cpu;
@ -492,20 +154,6 @@ int amdgpu_cs_alloc_ib(amdgpu_context_handle context,
return r; return r;
} }
int amdgpu_cs_free_ib(amdgpu_ib_handle handle)
{
amdgpu_context_handle context;
if (NULL == handle)
return -EINVAL;
context = handle->context;
pthread_mutex_lock(&context->pendings_mutex);
LIST_ADD(&handle->list_node, &context->freed);
pthread_mutex_unlock(&context->pendings_mutex);
return 0;
}
/** /**
* Create command submission context * Create command submission context
* *
@ -536,15 +184,7 @@ int amdgpu_cs_ctx_create(amdgpu_device_handle dev,
if (r) if (r)
goto error_mutex; goto error_mutex;
r = amdgpu_cs_init_ib_pool(gpu_context); r = amdgpu_cs_create_ib(gpu_context, amdgpu_cs_ib_size_4K,
if (r)
goto error_pool;
r = amdgpu_cs_init_pendings(gpu_context);
if (r)
goto error_pendings;
r = amdgpu_cs_alloc_ib_local(gpu_context, amdgpu_cs_ib_size_4K,
&gpu_context->fence_ib); &gpu_context->fence_ib);
if (r) if (r)
goto error_fence_ib; goto error_fence_ib;
@ -565,12 +205,6 @@ error_kernel:
amdgpu_cs_free_ib(gpu_context->fence_ib); amdgpu_cs_free_ib(gpu_context->fence_ib);
error_fence_ib: error_fence_ib:
amdgpu_cs_destroy_pendings(gpu_context);
error_pendings:
amdgpu_cs_destroy_ib_pool(gpu_context);
error_pool:
pthread_mutex_destroy(&gpu_context->sequence_mutex); pthread_mutex_destroy(&gpu_context->sequence_mutex);
error_mutex: error_mutex:
@ -598,14 +232,6 @@ int amdgpu_cs_ctx_free(amdgpu_context_handle context)
if (r) if (r)
return r; return r;
r = amdgpu_cs_destroy_pendings(context);
if (r)
return r;
r = amdgpu_cs_destroy_ib_pool(context);
if (r)
return r;
pthread_mutex_destroy(&context->sequence_mutex); pthread_mutex_destroy(&context->sequence_mutex);
/* now deal with kernel side */ /* now deal with kernel side */
@ -660,7 +286,7 @@ static int amdgpu_cs_submit_one(amdgpu_context_handle context,
struct amdgpu_cs_request *ibs_request, struct amdgpu_cs_request *ibs_request,
uint64_t *fence) uint64_t *fence)
{ {
int r; int r = 0;
uint32_t i, size; uint32_t i, size;
union drm_amdgpu_cs cs; union drm_amdgpu_cs cs;
uint64_t *chunk_array; uint64_t *chunk_array;
@ -678,10 +304,10 @@ static int amdgpu_cs_submit_one(amdgpu_context_handle context,
sizeof(uint64_t) + sizeof(uint64_t) +
sizeof(struct drm_amdgpu_cs_chunk) + sizeof(struct drm_amdgpu_cs_chunk) +
sizeof(struct drm_amdgpu_cs_chunk_data)); sizeof(struct drm_amdgpu_cs_chunk_data));
chunk_array = malloc(size);
chunk_array = calloc(1, size);
if (NULL == chunk_array) if (NULL == chunk_array)
return -ENOMEM; return -ENOMEM;
memset(chunk_array, 0, size);
chunks = (struct drm_amdgpu_cs_chunk *)(chunk_array + ibs_request->number_of_ibs + 1); chunks = (struct drm_amdgpu_cs_chunk *)(chunk_array + ibs_request->number_of_ibs + 1);
chunk_data = (struct drm_amdgpu_cs_chunk_data *)(chunks + ibs_request->number_of_ibs + 1); chunk_data = (struct drm_amdgpu_cs_chunk_data *)(chunks + ibs_request->number_of_ibs + 1);
@ -737,31 +363,8 @@ static int amdgpu_cs_submit_one(amdgpu_context_handle context,
if (r) if (r)
goto error_unlock; goto error_unlock;
/* Hold sequence_mutex while adding record to the pending list.
So the pending list is a sorted list according to fence value. */
for (i = 0; i < ibs_request->number_of_ibs; i++) {
struct amdgpu_cs_ib_info *ib;
ib = &ibs_request->ibs[i];
if (ib->flags & AMDGPU_CS_REUSE_IB)
continue;
ib->ib_handle->cs_handle = cs.out.handle;
amdgpu_cs_add_pending(context, ib->ib_handle, ibs_request->ip_type,
ibs_request->ip_instance,
ibs_request->ring);
}
*fence = cs.out.handle; *fence = cs.out.handle;
pthread_mutex_unlock(&context->sequence_mutex);
free(chunk_array);
return 0;
error_unlock: error_unlock:
pthread_mutex_unlock(&context->sequence_mutex); pthread_mutex_unlock(&context->sequence_mutex);
free(chunk_array); free(chunk_array);
@ -894,8 +497,6 @@ int amdgpu_cs_query_fence_status(struct amdgpu_cs_query_fence *fence,
/* This fence value is signaled already. */ /* This fence value is signaled already. */
*expired_fence = *signaled_fence; *expired_fence = *signaled_fence;
pthread_mutex_unlock(&context->sequence_mutex); pthread_mutex_unlock(&context->sequence_mutex);
amdgpu_cs_pending_gc(context, ip_type, ip_instance, ring,
fence->fence);
*expired = true; *expired = true;
return 0; return 0;
} }
@ -910,14 +511,9 @@ int amdgpu_cs_query_fence_status(struct amdgpu_cs_query_fence *fence,
/* The thread doesn't hold sequence_mutex. Other thread could /* The thread doesn't hold sequence_mutex. Other thread could
update *expired_fence already. Check whether there is a update *expired_fence already. Check whether there is a
newerly expired fence. */ newerly expired fence. */
if (fence->fence > *expired_fence) { if (fence->fence > *expired_fence)
*expired_fence = fence->fence; *expired_fence = fence->fence;
pthread_mutex_unlock(&context->sequence_mutex); pthread_mutex_unlock(&context->sequence_mutex);
amdgpu_cs_pending_gc(context, ip_type, ip_instance,
ring, fence->fence);
} else {
pthread_mutex_unlock(&context->sequence_mutex);
}
} }
return r; return r;

20
amdgpu/amdgpu_internal.h
View File

@ -97,42 +97,24 @@ struct amdgpu_bo_list {
uint32_t handle; uint32_t handle;
}; };
/*
* There are three mutexes.
* To avoid deadlock, only hold the mutexes in this order:
* sequence_mutex -> pendings_mutex -> pool_mutex.
*/
struct amdgpu_context { struct amdgpu_context {
struct amdgpu_device *dev; struct amdgpu_device *dev;
/** Mutex for accessing fences and to maintain command submissions /** Mutex for accessing fences and to maintain command submissions
and pending lists in good sequence. */ in good sequence. */
pthread_mutex_t sequence_mutex; pthread_mutex_t sequence_mutex;
/** Buffer for user fences */ /** Buffer for user fences */
struct amdgpu_ib *fence_ib; struct amdgpu_ib *fence_ib;
/** The newest expired fence for the ring of the ip blocks. */ /** The newest expired fence for the ring of the ip blocks. */
uint64_t expired_fences[AMDGPU_HW_IP_NUM][AMDGPU_HW_IP_INSTANCE_MAX_COUNT][AMDGPU_CS_MAX_RINGS]; uint64_t expired_fences[AMDGPU_HW_IP_NUM][AMDGPU_HW_IP_INSTANCE_MAX_COUNT][AMDGPU_CS_MAX_RINGS];
/** Mutex for accessing pendings list. */
pthread_mutex_t pendings_mutex;
/** Pending IBs. */
struct list_head pendings[AMDGPU_HW_IP_NUM][AMDGPU_HW_IP_INSTANCE_MAX_COUNT][AMDGPU_CS_MAX_RINGS];
/** Freed IBs not yet in pool */
struct list_head freed;
/** Mutex for accessing free ib pool. */
pthread_mutex_t pool_mutex;
/** Internal free IB pools. */
struct list_head ib_pools[AMDGPU_CS_IB_SIZE_NUM];
/* context id*/ /* context id*/
uint32_t id; uint32_t id;
}; };
struct amdgpu_ib { struct amdgpu_ib {
amdgpu_context_handle context; amdgpu_context_handle context;
struct list_head list_node;
amdgpu_bo_handle buf_handle; amdgpu_bo_handle buf_handle;
void *cpu; void *cpu;
uint64_t virtual_mc_base_address; uint64_t virtual_mc_base_address;
enum amdgpu_cs_ib_size ib_size;
uint64_t cs_handle;
}; };
/** /**