1 // SPDX-License-Identifier: GPL-2.0 OR MIT 2 /* 3 * Copyright 2014-2022 Advanced Micro Devices, Inc. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9 * and/or sell copies of the Software, and to permit persons to whom the 10 * Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice shall be included in 13 * all copies or substantial portions of the Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 19 * 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 OR 21 * 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 the 32 * 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 that 37 * receives 32-bit writes that are passed to queues as wptr values. 38 * The doorbells are intended to be written by applications as part 39 * 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 creates 42 * its first queue on each device. 43 * Although the mapping is done by KFD, it is equivalent to an mmap of 44 * 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 of 46 * offsets (KFD_MMAP_DOORBELL_START-END) is used for doorbells. 47 */ 48 49 /* # of doorbell bytes allocated for each process. */ 50 size_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 else 57 return amdgpu_mes_doorbell_process_slice( 58 (struct amdgpu_device *)kfd->adev); 59 } 60 61 /* Doorbell calculations for device init. */ 62 int 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 for 69 * ring test/HWS. So instead of reserving a whole page here for 70 * kernel, reserve and consume a doorbell from existing KGD kernel 71 * 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 99 void 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 } 105 106 int 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 doorbell 114 * 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 */ 150 void __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, kfd->doorbells, inx); 165 166 pr_debug("Get kernel queue doorbell\n" 167 " doorbell offset == 0x%08X\n" 168 " doorbell index == 0x%x\n", 169 *doorbell_off, inx); 170 171 return kfd->doorbell_kernel_ptr + inx; 172 } 173 174 void kfd_release_kernel_doorbell(struct kfd_dev *kfd, u32 __iomem *db_addr) 175 { 176 unsigned int inx; 177 178 inx = (unsigned int)(db_addr - kfd->doorbell_kernel_ptr); 179 180 mutex_lock(&kfd->doorbell_mutex); 181 __clear_bit(inx, kfd->doorbell_bitmap); 182 mutex_unlock(&kfd->doorbell_mutex); 183 } 184 185 void write_kernel_doorbell(void __iomem *db, u32 value) 186 { 187 if (db) { 188 writel(value, db); 189 pr_debug("Writing %d to doorbell address %p\n", value, db); 190 } 191 } 192 193 void write_kernel_doorbell64(void __iomem *db, u64 value) 194 { 195 if (db) { 196 WARN(((unsigned long)db & 7) != 0, 197 "Unaligned 64-bit doorbell"); 198 writeq(value, (u64 __iomem *)db); 199 pr_debug("writing %llu to doorbell address %p\n", value, db); 200 } 201 } 202 203 static int init_doorbell_bitmap(struct qcm_process_device *qpd, 204 struct kfd_dev *dev) 205 { 206 unsigned int i; 207 int range_start = dev->shared_resources.non_cp_doorbells_start; 208 int range_end = dev->shared_resources.non_cp_doorbells_end; 209 210 if (!KFD_IS_SOC15(dev)) 211 return 0; 212 213 /* Mask out doorbells reserved for SDMA, IH, and VCN on SOC15. */ 214 pr_debug("reserved doorbell 0x%03x - 0x%03x\n", range_start, range_end); 215 pr_debug("reserved doorbell 0x%03x - 0x%03x\n", 216 range_start + KFD_QUEUE_DOORBELL_MIRROR_OFFSET, 217 range_end + KFD_QUEUE_DOORBELL_MIRROR_OFFSET); 218 219 for (i = 0; i < KFD_MAX_NUM_OF_QUEUES_PER_PROCESS / 2; i++) { 220 if (i >= range_start && i <= range_end) { 221 __set_bit(i, qpd->doorbell_bitmap); 222 __set_bit(i + KFD_QUEUE_DOORBELL_MIRROR_OFFSET, 223 qpd->doorbell_bitmap); 224 } 225 } 226 227 return 0; 228 } 229 230 phys_addr_t kfd_get_process_doorbells(struct kfd_process_device *pdd) 231 { 232 struct amdgpu_device *adev = pdd->dev->adev; 233 uint32_t first_db_index; 234 235 if (!pdd->qpd.proc_doorbells) { 236 if (kfd_alloc_process_doorbells(pdd->dev->kfd, pdd)) 237 /* phys_addr_t 0 is error */ 238 return 0; 239 } 240 241 first_db_index = amdgpu_doorbell_index_on_bar(adev, pdd->qpd.proc_doorbells, 0); 242 return adev->doorbell.base + first_db_index * sizeof(uint32_t); 243 } 244 245 int kfd_alloc_process_doorbells(struct kfd_dev *kfd, struct kfd_process_device *pdd) 246 { 247 int r; 248 struct qcm_process_device *qpd = &pdd->qpd; 249 250 /* Allocate bitmap for dynamic doorbell allocation */ 251 qpd->doorbell_bitmap = bitmap_zalloc(KFD_MAX_NUM_OF_QUEUES_PER_PROCESS, 252 GFP_KERNEL); 253 if (!qpd->doorbell_bitmap) { 254 DRM_ERROR("Failed to allocate process doorbell bitmap\n"); 255 return -ENOMEM; 256 } 257 258 r = init_doorbell_bitmap(&pdd->qpd, kfd); 259 if (r) { 260 DRM_ERROR("Failed to initialize process doorbells\n"); 261 r = -ENOMEM; 262 goto err; 263 } 264 265 /* Allocate doorbells for this process */ 266 r = amdgpu_bo_create_kernel(kfd->adev, 267 kfd_doorbell_process_slice(kfd), 268 PAGE_SIZE, 269 AMDGPU_GEM_DOMAIN_DOORBELL, 270 &qpd->proc_doorbells, 271 NULL, 272 NULL); 273 if (r) { 274 DRM_ERROR("Failed to allocate process doorbells\n"); 275 goto err; 276 } 277 return 0; 278 279 err: 280 bitmap_free(qpd->doorbell_bitmap); 281 qpd->doorbell_bitmap = NULL; 282 return r; 283 } 284 285 void kfd_free_process_doorbells(struct kfd_dev *kfd, struct kfd_process_device *pdd) 286 { 287 struct qcm_process_device *qpd = &pdd->qpd; 288 289 if (qpd->doorbell_bitmap) { 290 bitmap_free(qpd->doorbell_bitmap); 291 qpd->doorbell_bitmap = NULL; 292 } 293 294 amdgpu_bo_free_kernel(&qpd->proc_doorbells, NULL, NULL); 295 } 296