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1// SPDX-License-Identifier: GPL-2.0 OR MIT2/*3 * Copyright 2014-2022 Advanced Micro Devices, Inc.4 *5 * Permission is hereby granted, free of charge, to any person obtaining a6 * copy of this software and associated documentation files (the "Software"),7 * to deal in the Software without restriction, including without limitation8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,9 * and/or sell copies of the Software, and to permit persons to whom the10 * Software is furnished to do so, subject to the following conditions:11 *12 * The above copyright notice and this permission notice shall be included in13 * all copies or substantial portions of the Software.14 *15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR21 * OTHER DEALINGS IN THE SOFTWARE.22 */23#include "kfd_priv.h"24#include <linux/mm.h>25#include <linux/mman.h>26#include <linux/slab.h>27#include <linux/io.h>28#include <linux/idr.h>29 30/*31 * This extension supports a kernel level doorbells management for the32 * kernel queues using the first doorbell page reserved for the kernel.33 */34 35/*36 * Each device exposes a doorbell aperture, a PCI MMIO aperture that37 * receives 32-bit writes that are passed to queues as wptr values.38 * The doorbells are intended to be written by applications as part39 * of queueing work on user-mode queues.40 * We assign doorbells to applications in PAGE_SIZE-sized and aligned chunks.41 * We map the doorbell address space into user-mode when a process creates42 * its first queue on each device.43 * Although the mapping is done by KFD, it is equivalent to an mmap of44 * the /dev/kfd with the particular device encoded in the mmap offset.45 * There will be other uses for mmap of /dev/kfd, so only a range of46 * offsets (KFD_MMAP_DOORBELL_START-END) is used for doorbells.47 */48 49/* # of doorbell bytes allocated for each process. */50size_t kfd_doorbell_process_slice(struct kfd_dev *kfd)51{52 if (!kfd->shared_resources.enable_mes)53 return roundup(kfd->device_info.doorbell_size *54 KFD_MAX_NUM_OF_QUEUES_PER_PROCESS,55 PAGE_SIZE);56 else57 return amdgpu_mes_doorbell_process_slice(58 (struct amdgpu_device *)kfd->adev);59}60 61/* Doorbell calculations for device init. */62int kfd_doorbell_init(struct kfd_dev *kfd)63{64 int size = PAGE_SIZE;65 int r;66 67 /*68 * Todo: KFD kernel level operations need only one doorbell for69 * ring test/HWS. So instead of reserving a whole page here for70 * kernel, reserve and consume a doorbell from existing KGD kernel71 * doorbell page.72 */73 74 /* Bitmap to dynamically allocate doorbells from kernel page */75 kfd->doorbell_bitmap = bitmap_zalloc(size / sizeof(u32), GFP_KERNEL);76 if (!kfd->doorbell_bitmap) {77 DRM_ERROR("Failed to allocate kernel doorbell bitmap\n");78 return -ENOMEM;79 }80 81 /* Alloc a doorbell page for KFD kernel usages */82 r = amdgpu_bo_create_kernel(kfd->adev,83 size,84 PAGE_SIZE,85 AMDGPU_GEM_DOMAIN_DOORBELL,86 &kfd->doorbells,87 NULL,88 (void **)&kfd->doorbell_kernel_ptr);89 if (r) {90 pr_err("failed to allocate kernel doorbells\n");91 bitmap_free(kfd->doorbell_bitmap);92 return r;93 }94 95 pr_debug("Doorbell kernel address == %p\n", kfd->doorbell_kernel_ptr);96 return 0;97}98 99void kfd_doorbell_fini(struct kfd_dev *kfd)100{101 bitmap_free(kfd->doorbell_bitmap);102 amdgpu_bo_free_kernel(&kfd->doorbells, NULL,103 (void **)&kfd->doorbell_kernel_ptr);104}105 106int kfd_doorbell_mmap(struct kfd_node *dev, struct kfd_process *process,107 struct vm_area_struct *vma)108{109 phys_addr_t address;110 struct kfd_process_device *pdd;111 112 /*113 * For simplicitly we only allow mapping of the entire doorbell114 * allocation of a single device & process.115 */116 if (vma->vm_end - vma->vm_start != kfd_doorbell_process_slice(dev->kfd))117 return -EINVAL;118 119 pdd = kfd_get_process_device_data(dev, process);120 if (!pdd)121 return -EINVAL;122 123 /* Calculate physical address of doorbell */124 address = kfd_get_process_doorbells(pdd);125 if (!address)126 return -ENOMEM;127 vm_flags_set(vma, VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_NORESERVE |128 VM_DONTDUMP | VM_PFNMAP);129 130 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);131 132 pr_debug("Mapping doorbell page\n"133 " target user address == 0x%08llX\n"134 " physical address == 0x%08llX\n"135 " vm_flags == 0x%04lX\n"136 " size == 0x%04lX\n",137 (unsigned long long) vma->vm_start, address, vma->vm_flags,138 kfd_doorbell_process_slice(dev->kfd));139 140 141 return io_remap_pfn_range(vma,142 vma->vm_start,143 address >> PAGE_SHIFT,144 kfd_doorbell_process_slice(dev->kfd),145 vma->vm_page_prot);146}147 148 149/* get kernel iomem pointer for a doorbell */150void __iomem *kfd_get_kernel_doorbell(struct kfd_dev *kfd,151 unsigned int *doorbell_off)152{153 u32 inx;154 155 mutex_lock(&kfd->doorbell_mutex);156 inx = find_first_zero_bit(kfd->doorbell_bitmap, PAGE_SIZE / sizeof(u32));157 158 __set_bit(inx, kfd->doorbell_bitmap);159 mutex_unlock(&kfd->doorbell_mutex);160 161 if (inx >= KFD_MAX_NUM_OF_QUEUES_PER_PROCESS)162 return NULL;163 164 *doorbell_off = amdgpu_doorbell_index_on_bar(kfd->adev,165 kfd->doorbells,166 inx,167 kfd->device_info.doorbell_size);168 inx *= 2;169 170 pr_debug("Get kernel queue doorbell\n"171 " doorbell offset == 0x%08X\n"172 " doorbell index == 0x%x\n",173 *doorbell_off, inx);174 175 return kfd->doorbell_kernel_ptr + inx;176}177 178void kfd_release_kernel_doorbell(struct kfd_dev *kfd, u32 __iomem *db_addr)179{180 unsigned int inx;181 182 inx = (unsigned int)(db_addr - kfd->doorbell_kernel_ptr);183 inx /= 2;184 185 mutex_lock(&kfd->doorbell_mutex);186 __clear_bit(inx, kfd->doorbell_bitmap);187 mutex_unlock(&kfd->doorbell_mutex);188}189 190void write_kernel_doorbell(void __iomem *db, u32 value)191{192 if (db) {193 writel(value, db);194 pr_debug("Writing %d to doorbell address %p\n", value, db);195 }196}197 198void write_kernel_doorbell64(void __iomem *db, u64 value)199{200 if (db) {201 WARN(((unsigned long)db & 7) != 0,202 "Unaligned 64-bit doorbell");203 writeq(value, (u64 __iomem *)db);204 pr_debug("writing %llu to doorbell address %p\n", value, db);205 }206}207 208static int init_doorbell_bitmap(struct qcm_process_device *qpd,209 struct kfd_dev *dev)210{211 unsigned int i;212 int range_start = dev->shared_resources.non_cp_doorbells_start;213 int range_end = dev->shared_resources.non_cp_doorbells_end;214 215 if (!KFD_IS_SOC15(dev))216 return 0;217 218 /* Mask out doorbells reserved for SDMA, IH, and VCN on SOC15. */219 pr_debug("reserved doorbell 0x%03x - 0x%03x\n", range_start, range_end);220 pr_debug("reserved doorbell 0x%03x - 0x%03x\n",221 range_start + KFD_QUEUE_DOORBELL_MIRROR_OFFSET,222 range_end + KFD_QUEUE_DOORBELL_MIRROR_OFFSET);223 224 for (i = 0; i < KFD_MAX_NUM_OF_QUEUES_PER_PROCESS / 2; i++) {225 if (i >= range_start && i <= range_end) {226 __set_bit(i, qpd->doorbell_bitmap);227 __set_bit(i + KFD_QUEUE_DOORBELL_MIRROR_OFFSET,228 qpd->doorbell_bitmap);229 }230 }231 232 return 0;233}234 235phys_addr_t kfd_get_process_doorbells(struct kfd_process_device *pdd)236{237 struct amdgpu_device *adev = pdd->dev->adev;238 uint32_t first_db_index;239 240 if (!pdd->qpd.proc_doorbells) {241 if (kfd_alloc_process_doorbells(pdd->dev->kfd, pdd))242 /* phys_addr_t 0 is error */243 return 0;244 }245 246 first_db_index = amdgpu_doorbell_index_on_bar(adev,247 pdd->qpd.proc_doorbells,248 0,249 pdd->dev->kfd->device_info.doorbell_size);250 return adev->doorbell.base + first_db_index * sizeof(uint32_t);251}252 253int kfd_alloc_process_doorbells(struct kfd_dev *kfd, struct kfd_process_device *pdd)254{255 int r;256 struct qcm_process_device *qpd = &pdd->qpd;257 258 /* Allocate bitmap for dynamic doorbell allocation */259 qpd->doorbell_bitmap = bitmap_zalloc(KFD_MAX_NUM_OF_QUEUES_PER_PROCESS,260 GFP_KERNEL);261 if (!qpd->doorbell_bitmap) {262 DRM_ERROR("Failed to allocate process doorbell bitmap\n");263 return -ENOMEM;264 }265 266 r = init_doorbell_bitmap(&pdd->qpd, kfd);267 if (r) {268 DRM_ERROR("Failed to initialize process doorbells\n");269 r = -ENOMEM;270 goto err;271 }272 273 /* Allocate doorbells for this process */274 r = amdgpu_bo_create_kernel(kfd->adev,275 kfd_doorbell_process_slice(kfd),276 PAGE_SIZE,277 AMDGPU_GEM_DOMAIN_DOORBELL,278 &qpd->proc_doorbells,279 NULL,280 NULL);281 if (r) {282 DRM_ERROR("Failed to allocate process doorbells\n");283 goto err;284 }285 return 0;286 287err:288 bitmap_free(qpd->doorbell_bitmap);289 qpd->doorbell_bitmap = NULL;290 return r;291}292 293void kfd_free_process_doorbells(struct kfd_dev *kfd, struct kfd_process_device *pdd)294{295 struct qcm_process_device *qpd = &pdd->qpd;296 297 if (qpd->doorbell_bitmap) {298 bitmap_free(qpd->doorbell_bitmap);299 qpd->doorbell_bitmap = NULL;300 }301 302 amdgpu_bo_free_kernel(&qpd->proc_doorbells, NULL, NULL);303}304