// SPDX-License-Identifier: MIT
/*
* Copyright 2023 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.h"
#include "amdgpu_seq64.h"
#include <drm/drm_exec.h>
/**
* DOC: amdgpu_seq64
*
* amdgpu_seq64 allocates a 64bit memory on each request in sequence order.
* seq64 driver is required for user queue fence memory allocation, TLB
* counters and VM updates. It has maximum count of 32768 64 bit slots.
*/
/**
* amdgpu_seq64_get_va_base - Get the seq64 va base address
*
* @adev: amdgpu_device pointer
*
* Returns:
* va base address on success
*/
static inline u64 amdgpu_seq64_get_va_base(struct amdgpu_device *adev)
{
return AMDGPU_VA_RESERVED_SEQ64_START(adev);
}
/**
* amdgpu_seq64_map - Map the seq64 memory to VM
*
* @adev: amdgpu_device pointer
* @vm: vm pointer
* @bo_va: bo_va pointer
*
* Map the seq64 memory to the given VM.
*
* Returns:
* 0 on success or a negative error code on failure
*/
int amdgpu_seq64_map(struct amdgpu_device *adev, struct amdgpu_vm *vm,
struct amdgpu_bo_va **bo_va)
{
struct amdgpu_bo *bo;
struct drm_exec exec;
u64 seq64_addr;
int r;
bo = adev->seq64.sbo;
if (!bo)
return -EINVAL;
drm_exec_init(&exec, DRM_EXEC_INTERRUPTIBLE_WAIT, 0);
drm_exec_until_all_locked(&exec) {
r = amdgpu_vm_lock_pd(vm, &exec, 0);
if (likely(!r))
r = drm_exec_lock_obj(&exec, &bo->tbo.base);
drm_exec_retry_on_contention(&exec);
if (unlikely(r))
goto error;
}
*bo_va = amdgpu_vm_bo_add(adev, vm, bo);
if (!*bo_va) {
r = -ENOMEM;
goto error;
}
seq64_addr = amdgpu_seq64_get_va_base(adev);
r = amdgpu_vm_bo_map(adev, *bo_va, seq64_addr, 0, AMDGPU_VA_RESERVED_SEQ64_SIZE,
AMDGPU_PTE_READABLE);
if (r) {
DRM_ERROR("failed to do bo_map on userq sem, err=%d\n", r);
amdgpu_vm_bo_del(adev, *bo_va);
goto error;
}
r = amdgpu_vm_bo_update(adev, *bo_va, false);
if (r) {
DRM_ERROR("failed to do vm_bo_update on userq sem\n");
amdgpu_vm_bo_del(adev, *bo_va);
goto error;
}
error:
drm_exec_fini(&exec);
return r;
}
/**
* amdgpu_seq64_unmap - Unmap the seq64 memory
*
* @adev: amdgpu_device pointer
* @fpriv: DRM file private
*
* Unmap the seq64 memory from the given VM.
*/
void amdgpu_seq64_unmap(struct amdgpu_device *adev, struct amdgpu_fpriv *fpriv)
{
struct amdgpu_vm *vm;
struct amdgpu_bo *bo;
struct drm_exec exec;
int r;
if (!fpriv->seq64_va)
return;
bo = adev->seq64.sbo;
if (!bo)
return;
vm = &fpriv->vm;
drm_exec_init(&exec, DRM_EXEC_INTERRUPTIBLE_WAIT, 0);
drm_exec_until_all_locked(&exec) {
r = amdgpu_vm_lock_pd(vm, &exec, 0);
if (likely(!r))
r = drm_exec_lock_obj(&exec, &bo->tbo.base);
drm_exec_retry_on_contention(&exec);
if (unlikely(r))
goto error;
}
amdgpu_vm_bo_del(adev, fpriv->seq64_va);
fpriv->seq64_va = NULL;
error:
drm_exec_fini(&exec);
}
/**
* amdgpu_seq64_alloc - Allocate a 64 bit memory
*
* @adev: amdgpu_device pointer
* @va: VA to access the seq in process address space
* @cpu_addr: CPU address to access the seq
*
* Alloc a 64 bit memory from seq64 pool.
*
* Returns:
* 0 on success or a negative error code on failure
*/
int amdgpu_seq64_alloc(struct amdgpu_device *adev, u64 *va, u64 **cpu_addr)
{
unsigned long bit_pos;
bit_pos = find_first_zero_bit(adev->seq64.used, adev->seq64.num_sem);
if (bit_pos >= adev->seq64.num_sem)
return -ENOSPC;
__set_bit(bit_pos, adev->seq64.used);
*va = bit_pos * sizeof(u64) + amdgpu_seq64_get_va_base(adev);
*cpu_addr = bit_pos + adev->seq64.cpu_base_addr;
return 0;
}
/**
* amdgpu_seq64_free - Free the given 64 bit memory
*
* @adev: amdgpu_device pointer
* @va: gpu start address to be freed
*
* Free the given 64 bit memory from seq64 pool.
*/
void amdgpu_seq64_free(struct amdgpu_device *adev, u64 va)
{
unsigned long bit_pos;
bit_pos = (va - amdgpu_seq64_get_va_base(adev)) / sizeof(u64);
if (bit_pos < adev->seq64.num_sem)
__clear_bit(bit_pos, adev->seq64.used);
}
/**
* amdgpu_seq64_fini - Cleanup seq64 driver
*
* @adev: amdgpu_device pointer
*
* Free the memory space allocated for seq64.
*
*/
void amdgpu_seq64_fini(struct amdgpu_device *adev)
{
amdgpu_bo_free_kernel(&adev->seq64.sbo,
NULL,
(void **)&adev->seq64.cpu_base_addr);
}
/**
* amdgpu_seq64_init - Initialize seq64 driver
*
* @adev: amdgpu_device pointer
*
* Allocate the required memory space for seq64.
*
* Returns:
* 0 on success or a negative error code on failure
*/
int amdgpu_seq64_init(struct amdgpu_device *adev)
{
int r;
if (adev->seq64.sbo)
return 0;
/*
* AMDGPU_MAX_SEQ64_SLOTS * sizeof(u64) * 8 = AMDGPU_MAX_SEQ64_SLOTS
* 64bit slots
*/
r = amdgpu_bo_create_kernel(adev, AMDGPU_VA_RESERVED_SEQ64_SIZE,
PAGE_SIZE, AMDGPU_GEM_DOMAIN_GTT,
&adev->seq64.sbo, NULL,
(void **)&adev->seq64.cpu_base_addr);
if (r) {
dev_warn(adev->dev, "(%d) create seq64 failed\n", r);
return r;
}
memset(adev->seq64.cpu_base_addr, 0, AMDGPU_VA_RESERVED_SEQ64_SIZE);
adev->seq64.num_sem = AMDGPU_MAX_SEQ64_SLOTS;
memset(&adev->seq64.used, 0, sizeof(adev->seq64.used));
return 0;
}
Codebase Browser
linux