diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c')
-rw-r--r-- | drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c b/drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c new file mode 100644 index 0000000000..05c74887fd --- /dev/null +++ b/drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c @@ -0,0 +1,303 @@ +// SPDX-License-Identifier: GPL-2.0 OR MIT +/* + * Copyright 2014-2022 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 "kfd_priv.h" +#include <linux/mm.h> +#include <linux/mman.h> +#include <linux/slab.h> +#include <linux/io.h> +#include <linux/idr.h> + +/* + * This extension supports a kernel level doorbells management for the + * kernel queues using the first doorbell page reserved for the kernel. + */ + +/* + * Each device exposes a doorbell aperture, a PCI MMIO aperture that + * receives 32-bit writes that are passed to queues as wptr values. + * The doorbells are intended to be written by applications as part + * of queueing work on user-mode queues. + * We assign doorbells to applications in PAGE_SIZE-sized and aligned chunks. + * We map the doorbell address space into user-mode when a process creates + * its first queue on each device. + * Although the mapping is done by KFD, it is equivalent to an mmap of + * the /dev/kfd with the particular device encoded in the mmap offset. + * There will be other uses for mmap of /dev/kfd, so only a range of + * offsets (KFD_MMAP_DOORBELL_START-END) is used for doorbells. + */ + +/* # of doorbell bytes allocated for each process. */ +size_t kfd_doorbell_process_slice(struct kfd_dev *kfd) +{ + if (!kfd->shared_resources.enable_mes) + return roundup(kfd->device_info.doorbell_size * + KFD_MAX_NUM_OF_QUEUES_PER_PROCESS, + PAGE_SIZE); + else + return amdgpu_mes_doorbell_process_slice( + (struct amdgpu_device *)kfd->adev); +} + +/* Doorbell calculations for device init. */ +int kfd_doorbell_init(struct kfd_dev *kfd) +{ + int size = PAGE_SIZE; + int r; + + /* + * Todo: KFD kernel level operations need only one doorbell for + * ring test/HWS. So instead of reserving a whole page here for + * kernel, reserve and consume a doorbell from existing KGD kernel + * doorbell page. + */ + + /* Bitmap to dynamically allocate doorbells from kernel page */ + kfd->doorbell_bitmap = bitmap_zalloc(size / sizeof(u32), GFP_KERNEL); + if (!kfd->doorbell_bitmap) { + DRM_ERROR("Failed to allocate kernel doorbell bitmap\n"); + return -ENOMEM; + } + + /* Alloc a doorbell page for KFD kernel usages */ + r = amdgpu_bo_create_kernel(kfd->adev, + size, + PAGE_SIZE, + AMDGPU_GEM_DOMAIN_DOORBELL, + &kfd->doorbells, + NULL, + (void **)&kfd->doorbell_kernel_ptr); + if (r) { + pr_err("failed to allocate kernel doorbells\n"); + bitmap_free(kfd->doorbell_bitmap); + return r; + } + + pr_debug("Doorbell kernel address == %p\n", kfd->doorbell_kernel_ptr); + return 0; +} + +void kfd_doorbell_fini(struct kfd_dev *kfd) +{ + bitmap_free(kfd->doorbell_bitmap); + amdgpu_bo_free_kernel(&kfd->doorbells, NULL, + (void **)&kfd->doorbell_kernel_ptr); +} + +int kfd_doorbell_mmap(struct kfd_node *dev, struct kfd_process *process, + struct vm_area_struct *vma) +{ + phys_addr_t address; + struct kfd_process_device *pdd; + + /* + * For simplicitly we only allow mapping of the entire doorbell + * allocation of a single device & process. + */ + if (vma->vm_end - vma->vm_start != kfd_doorbell_process_slice(dev->kfd)) + return -EINVAL; + + pdd = kfd_get_process_device_data(dev, process); + if (!pdd) + return -EINVAL; + + /* Calculate physical address of doorbell */ + address = kfd_get_process_doorbells(pdd); + if (!address) + return -ENOMEM; + vm_flags_set(vma, VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_NORESERVE | + VM_DONTDUMP | VM_PFNMAP); + + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + + pr_debug("Mapping doorbell page\n" + " target user address == 0x%08llX\n" + " physical address == 0x%08llX\n" + " vm_flags == 0x%04lX\n" + " size == 0x%04lX\n", + (unsigned long long) vma->vm_start, address, vma->vm_flags, + kfd_doorbell_process_slice(dev->kfd)); + + + return io_remap_pfn_range(vma, + vma->vm_start, + address >> PAGE_SHIFT, + kfd_doorbell_process_slice(dev->kfd), + vma->vm_page_prot); +} + + +/* get kernel iomem pointer for a doorbell */ +void __iomem *kfd_get_kernel_doorbell(struct kfd_dev *kfd, + unsigned int *doorbell_off) +{ + u32 inx; + + mutex_lock(&kfd->doorbell_mutex); + inx = find_first_zero_bit(kfd->doorbell_bitmap, PAGE_SIZE / sizeof(u32)); + + __set_bit(inx, kfd->doorbell_bitmap); + mutex_unlock(&kfd->doorbell_mutex); + + if (inx >= KFD_MAX_NUM_OF_QUEUES_PER_PROCESS) + return NULL; + + *doorbell_off = amdgpu_doorbell_index_on_bar(kfd->adev, + kfd->doorbells, + inx, + kfd->device_info.doorbell_size); + inx *= 2; + + pr_debug("Get kernel queue doorbell\n" + " doorbell offset == 0x%08X\n" + " doorbell index == 0x%x\n", + *doorbell_off, inx); + + return kfd->doorbell_kernel_ptr + inx; +} + +void kfd_release_kernel_doorbell(struct kfd_dev *kfd, u32 __iomem *db_addr) +{ + unsigned int inx; + + inx = (unsigned int)(db_addr - kfd->doorbell_kernel_ptr); + inx /= 2; + + mutex_lock(&kfd->doorbell_mutex); + __clear_bit(inx, kfd->doorbell_bitmap); + mutex_unlock(&kfd->doorbell_mutex); +} + +void write_kernel_doorbell(void __iomem *db, u32 value) +{ + if (db) { + writel(value, db); + pr_debug("Writing %d to doorbell address %p\n", value, db); + } +} + +void write_kernel_doorbell64(void __iomem *db, u64 value) +{ + if (db) { + WARN(((unsigned long)db & 7) != 0, + "Unaligned 64-bit doorbell"); + writeq(value, (u64 __iomem *)db); + pr_debug("writing %llu to doorbell address %p\n", value, db); + } +} + +static int init_doorbell_bitmap(struct qcm_process_device *qpd, + struct kfd_dev *dev) +{ + unsigned int i; + int range_start = dev->shared_resources.non_cp_doorbells_start; + int range_end = dev->shared_resources.non_cp_doorbells_end; + + if (!KFD_IS_SOC15(dev)) + return 0; + + /* Mask out doorbells reserved for SDMA, IH, and VCN on SOC15. */ + pr_debug("reserved doorbell 0x%03x - 0x%03x\n", range_start, range_end); + pr_debug("reserved doorbell 0x%03x - 0x%03x\n", + range_start + KFD_QUEUE_DOORBELL_MIRROR_OFFSET, + range_end + KFD_QUEUE_DOORBELL_MIRROR_OFFSET); + + for (i = 0; i < KFD_MAX_NUM_OF_QUEUES_PER_PROCESS / 2; i++) { + if (i >= range_start && i <= range_end) { + __set_bit(i, qpd->doorbell_bitmap); + __set_bit(i + KFD_QUEUE_DOORBELL_MIRROR_OFFSET, + qpd->doorbell_bitmap); + } + } + + return 0; +} + +phys_addr_t kfd_get_process_doorbells(struct kfd_process_device *pdd) +{ + struct amdgpu_device *adev = pdd->dev->adev; + uint32_t first_db_index; + + if (!pdd->qpd.proc_doorbells) { + if (kfd_alloc_process_doorbells(pdd->dev->kfd, pdd)) + /* phys_addr_t 0 is error */ + return 0; + } + + first_db_index = amdgpu_doorbell_index_on_bar(adev, + pdd->qpd.proc_doorbells, + 0, + pdd->dev->kfd->device_info.doorbell_size); + return adev->doorbell.base + first_db_index * sizeof(uint32_t); +} + +int kfd_alloc_process_doorbells(struct kfd_dev *kfd, struct kfd_process_device *pdd) +{ + int r; + struct qcm_process_device *qpd = &pdd->qpd; + + /* Allocate bitmap for dynamic doorbell allocation */ + qpd->doorbell_bitmap = bitmap_zalloc(KFD_MAX_NUM_OF_QUEUES_PER_PROCESS, + GFP_KERNEL); + if (!qpd->doorbell_bitmap) { + DRM_ERROR("Failed to allocate process doorbell bitmap\n"); + return -ENOMEM; + } + + r = init_doorbell_bitmap(&pdd->qpd, kfd); + if (r) { + DRM_ERROR("Failed to initialize process doorbells\n"); + r = -ENOMEM; + goto err; + } + + /* Allocate doorbells for this process */ + r = amdgpu_bo_create_kernel(kfd->adev, + kfd_doorbell_process_slice(kfd), + PAGE_SIZE, + AMDGPU_GEM_DOMAIN_DOORBELL, + &qpd->proc_doorbells, + NULL, + NULL); + if (r) { + DRM_ERROR("Failed to allocate process doorbells\n"); + goto err; + } + return 0; + +err: + bitmap_free(qpd->doorbell_bitmap); + qpd->doorbell_bitmap = NULL; + return r; +} + +void kfd_free_process_doorbells(struct kfd_dev *kfd, struct kfd_process_device *pdd) +{ + struct qcm_process_device *qpd = &pdd->qpd; + + if (qpd->doorbell_bitmap) { + bitmap_free(qpd->doorbell_bitmap); + qpd->doorbell_bitmap = NULL; + } + + amdgpu_bo_free_kernel(&qpd->proc_doorbells, NULL, NULL); +} |