1d87f36a0SRajneesh Bhardwaj // SPDX-License-Identifier: GPL-2.0 OR MIT 219f6d2a6SOded Gabbay /* 3d87f36a0SRajneesh Bhardwaj * Copyright 2014-2022 Advanced Micro Devices, Inc. 419f6d2a6SOded Gabbay * 519f6d2a6SOded Gabbay * Permission is hereby granted, free of charge, to any person obtaining a 619f6d2a6SOded Gabbay * copy of this software and associated documentation files (the "Software"), 719f6d2a6SOded Gabbay * to deal in the Software without restriction, including without limitation 819f6d2a6SOded Gabbay * the rights to use, copy, modify, merge, publish, distribute, sublicense, 919f6d2a6SOded Gabbay * and/or sell copies of the Software, and to permit persons to whom the 1019f6d2a6SOded Gabbay * Software is furnished to do so, subject to the following conditions: 1119f6d2a6SOded Gabbay * 1219f6d2a6SOded Gabbay * The above copyright notice and this permission notice shall be included in 1319f6d2a6SOded Gabbay * all copies or substantial portions of the Software. 1419f6d2a6SOded Gabbay * 1519f6d2a6SOded Gabbay * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 1619f6d2a6SOded Gabbay * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 1719f6d2a6SOded Gabbay * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 1819f6d2a6SOded Gabbay * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 1919f6d2a6SOded Gabbay * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 2019f6d2a6SOded Gabbay * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 2119f6d2a6SOded Gabbay * OTHER DEALINGS IN THE SOFTWARE. 2219f6d2a6SOded Gabbay */ 2319f6d2a6SOded Gabbay #include "kfd_priv.h" 2419f6d2a6SOded Gabbay #include <linux/mm.h> 2519f6d2a6SOded Gabbay #include <linux/mman.h> 2619f6d2a6SOded Gabbay #include <linux/slab.h> 27824cb7d1SOded Gabbay #include <linux/io.h> 28a91e70e3SFelix Kuehling #include <linux/idr.h> 2919f6d2a6SOded Gabbay 3019f6d2a6SOded Gabbay /* 31a91e70e3SFelix Kuehling * This extension supports a kernel level doorbells management for the 32a91e70e3SFelix Kuehling * kernel queues using the first doorbell page reserved for the kernel. 3319f6d2a6SOded Gabbay */ 3419f6d2a6SOded Gabbay 3519f6d2a6SOded Gabbay /* 3619f6d2a6SOded Gabbay * Each device exposes a doorbell aperture, a PCI MMIO aperture that 3719f6d2a6SOded Gabbay * receives 32-bit writes that are passed to queues as wptr values. 3819f6d2a6SOded Gabbay * The doorbells are intended to be written by applications as part 3919f6d2a6SOded Gabbay * of queueing work on user-mode queues. 4019f6d2a6SOded Gabbay * We assign doorbells to applications in PAGE_SIZE-sized and aligned chunks. 4119f6d2a6SOded Gabbay * We map the doorbell address space into user-mode when a process creates 4219f6d2a6SOded Gabbay * its first queue on each device. 4319f6d2a6SOded Gabbay * Although the mapping is done by KFD, it is equivalent to an mmap of 4419f6d2a6SOded Gabbay * the /dev/kfd with the particular device encoded in the mmap offset. 4519f6d2a6SOded Gabbay * There will be other uses for mmap of /dev/kfd, so only a range of 4619f6d2a6SOded Gabbay * offsets (KFD_MMAP_DOORBELL_START-END) is used for doorbells. 4719f6d2a6SOded Gabbay */ 4819f6d2a6SOded Gabbay 4919f6d2a6SOded Gabbay /* # of doorbell bytes allocated for each process. */ 50ef568db7SFelix Kuehling size_t kfd_doorbell_process_slice(struct kfd_dev *kfd) 5119f6d2a6SOded Gabbay { 52cc009e61SMukul Joshi if (!kfd->shared_resources.enable_mes) 53f0dc99a6SGraham Sider return roundup(kfd->device_info.doorbell_size * 5419f6d2a6SOded Gabbay KFD_MAX_NUM_OF_QUEUES_PER_PROCESS, 5519f6d2a6SOded Gabbay PAGE_SIZE); 56cc009e61SMukul Joshi else 57cc009e61SMukul Joshi return amdgpu_mes_doorbell_process_slice( 58cc009e61SMukul Joshi (struct amdgpu_device *)kfd->adev); 5919f6d2a6SOded Gabbay } 6019f6d2a6SOded Gabbay 6119f6d2a6SOded Gabbay /* Doorbell calculations for device init. */ 62735df2baSFelix Kuehling int kfd_doorbell_init(struct kfd_dev *kfd) 6319f6d2a6SOded Gabbay { 64c3186665SShashank Sharma int size = PAGE_SIZE; 65c3186665SShashank Sharma int r; 6619f6d2a6SOded Gabbay 6719f6d2a6SOded Gabbay /* 68c3186665SShashank Sharma * Todo: KFD kernel level operations need only one doorbell for 69c3186665SShashank Sharma * ring test/HWS. So instead of reserving a whole page here for 70c3186665SShashank Sharma * kernel, reserve and consume a doorbell from existing KGD kernel 71c3186665SShashank Sharma * doorbell page. 72cc009e61SMukul Joshi */ 73c3186665SShashank Sharma 74c3186665SShashank Sharma /* Bitmap to dynamically allocate doorbells from kernel page */ 75c3186665SShashank Sharma kfd->doorbell_bitmap = bitmap_zalloc(size / sizeof(u32), GFP_KERNEL); 76c3186665SShashank Sharma if (!kfd->doorbell_bitmap) { 77c3186665SShashank Sharma DRM_ERROR("Failed to allocate kernel doorbell bitmap\n"); 78c3186665SShashank Sharma return -ENOMEM; 79cc009e61SMukul Joshi } 80cc009e61SMukul Joshi 81c3186665SShashank Sharma /* Alloc a doorbell page for KFD kernel usages */ 82c3186665SShashank Sharma r = amdgpu_bo_create_kernel(kfd->adev, 83c3186665SShashank Sharma size, 84c3186665SShashank Sharma PAGE_SIZE, 85c3186665SShashank Sharma AMDGPU_GEM_DOMAIN_DOORBELL, 86c3186665SShashank Sharma &kfd->doorbells, 87c3186665SShashank Sharma NULL, 88c3186665SShashank Sharma (void **)&kfd->doorbell_kernel_ptr); 89c3186665SShashank Sharma if (r) { 90c3186665SShashank Sharma pr_err("failed to allocate kernel doorbells\n"); 91c3186665SShashank Sharma bitmap_free(kfd->doorbell_bitmap); 92c3186665SShashank Sharma return r; 93c3186665SShashank Sharma } 9419f6d2a6SOded Gabbay 95c3186665SShashank Sharma pr_debug("Doorbell kernel address == %p\n", kfd->doorbell_kernel_ptr); 96735df2baSFelix Kuehling return 0; 97735df2baSFelix Kuehling } 98735df2baSFelix Kuehling 99735df2baSFelix Kuehling void kfd_doorbell_fini(struct kfd_dev *kfd) 100735df2baSFelix Kuehling { 101c3186665SShashank Sharma bitmap_free(kfd->doorbell_bitmap); 102c3186665SShashank Sharma amdgpu_bo_free_kernel(&kfd->doorbells, NULL, 103c3186665SShashank Sharma (void **)&kfd->doorbell_kernel_ptr); 10419f6d2a6SOded Gabbay } 10519f6d2a6SOded Gabbay 1068dc1db31SMukul Joshi int kfd_doorbell_mmap(struct kfd_node *dev, struct kfd_process *process, 107df03ef93SHarish Kasiviswanathan struct vm_area_struct *vma) 10819f6d2a6SOded Gabbay { 10919f6d2a6SOded Gabbay phys_addr_t address; 11059d7115dSMukul Joshi struct kfd_process_device *pdd; 111ada2b29cSFelix Kuehling 11219f6d2a6SOded Gabbay /* 11319f6d2a6SOded Gabbay * For simplicitly we only allow mapping of the entire doorbell 11419f6d2a6SOded Gabbay * allocation of a single device & process. 11519f6d2a6SOded Gabbay */ 1168dc1db31SMukul Joshi if (vma->vm_end - vma->vm_start != kfd_doorbell_process_slice(dev->kfd)) 11719f6d2a6SOded Gabbay return -EINVAL; 11819f6d2a6SOded Gabbay 11959d7115dSMukul Joshi pdd = kfd_get_process_device_data(dev, process); 12059d7115dSMukul Joshi if (!pdd) 12159d7115dSMukul Joshi return -EINVAL; 12219f6d2a6SOded Gabbay 12359d7115dSMukul Joshi /* Calculate physical address of doorbell */ 12459d7115dSMukul Joshi address = kfd_get_process_doorbells(pdd); 12516f00131SFelix Kuehling if (!address) 12616f00131SFelix Kuehling return -ENOMEM; 1271c71222eSSuren Baghdasaryan vm_flags_set(vma, VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_NORESERVE | 1281c71222eSSuren Baghdasaryan VM_DONTDUMP | VM_PFNMAP); 12919f6d2a6SOded Gabbay 13019f6d2a6SOded Gabbay vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 13119f6d2a6SOded Gabbay 13279775b62SKent Russell pr_debug("Mapping doorbell page\n" 1336f4d92a1SEdward O'Callaghan " target user address == 0x%08llX\n" 1346f4d92a1SEdward O'Callaghan " physical address == 0x%08llX\n" 1356f4d92a1SEdward O'Callaghan " vm_flags == 0x%04lX\n" 1366f4d92a1SEdward O'Callaghan " size == 0x%04lX\n", 1376f4d92a1SEdward O'Callaghan (unsigned long long) vma->vm_start, address, vma->vm_flags, 1388dc1db31SMukul Joshi kfd_doorbell_process_slice(dev->kfd)); 13919f6d2a6SOded Gabbay 1406f4d92a1SEdward O'Callaghan 14119f6d2a6SOded Gabbay return io_remap_pfn_range(vma, 14219f6d2a6SOded Gabbay vma->vm_start, 14319f6d2a6SOded Gabbay address >> PAGE_SHIFT, 1448dc1db31SMukul Joshi kfd_doorbell_process_slice(dev->kfd), 14519f6d2a6SOded Gabbay vma->vm_page_prot); 14619f6d2a6SOded Gabbay } 14719f6d2a6SOded Gabbay 14819f6d2a6SOded Gabbay 14919f6d2a6SOded Gabbay /* get kernel iomem pointer for a doorbell */ 150ada2b29cSFelix Kuehling void __iomem *kfd_get_kernel_doorbell(struct kfd_dev *kfd, 15119f6d2a6SOded Gabbay unsigned int *doorbell_off) 15219f6d2a6SOded Gabbay { 15319f6d2a6SOded Gabbay u32 inx; 15419f6d2a6SOded Gabbay 155cea405b1SXihan Zhang mutex_lock(&kfd->doorbell_mutex); 156c3186665SShashank Sharma inx = find_first_zero_bit(kfd->doorbell_bitmap, PAGE_SIZE / sizeof(u32)); 15719f6d2a6SOded Gabbay 158c3186665SShashank Sharma __set_bit(inx, kfd->doorbell_bitmap); 159cea405b1SXihan Zhang mutex_unlock(&kfd->doorbell_mutex); 16019f6d2a6SOded Gabbay 16119f6d2a6SOded Gabbay if (inx >= KFD_MAX_NUM_OF_QUEUES_PER_PROCESS) 16219f6d2a6SOded Gabbay return NULL; 16319f6d2a6SOded Gabbay 164c3186665SShashank Sharma *doorbell_off = amdgpu_doorbell_index_on_bar(kfd->adev, kfd->doorbells, inx); 16519f6d2a6SOded Gabbay 16679775b62SKent Russell pr_debug("Get kernel queue doorbell\n" 1676dae6162SColin Ian King " doorbell offset == 0x%08X\n" 168951df6d9SShaoyun Liu " doorbell index == 0x%x\n", 169951df6d9SShaoyun Liu *doorbell_off, inx); 17019f6d2a6SOded Gabbay 17119f6d2a6SOded Gabbay return kfd->doorbell_kernel_ptr + inx; 17219f6d2a6SOded Gabbay } 17319f6d2a6SOded Gabbay 17419f6d2a6SOded Gabbay void kfd_release_kernel_doorbell(struct kfd_dev *kfd, u32 __iomem *db_addr) 17519f6d2a6SOded Gabbay { 17619f6d2a6SOded Gabbay unsigned int inx; 17719f6d2a6SOded Gabbay 178c3186665SShashank Sharma inx = (unsigned int)(db_addr - kfd->doorbell_kernel_ptr); 17919f6d2a6SOded Gabbay 180cea405b1SXihan Zhang mutex_lock(&kfd->doorbell_mutex); 181c3186665SShashank Sharma __clear_bit(inx, kfd->doorbell_bitmap); 182cea405b1SXihan Zhang mutex_unlock(&kfd->doorbell_mutex); 18319f6d2a6SOded Gabbay } 18419f6d2a6SOded Gabbay 185ada2b29cSFelix Kuehling void write_kernel_doorbell(void __iomem *db, u32 value) 18619f6d2a6SOded Gabbay { 18719f6d2a6SOded Gabbay if (db) { 18819f6d2a6SOded Gabbay writel(value, db); 1898f8fb9b9SKent Russell pr_debug("Writing %d to doorbell address %p\n", value, db); 19019f6d2a6SOded Gabbay } 19119f6d2a6SOded Gabbay } 19219f6d2a6SOded Gabbay 1939d7d0248SFelix Kuehling void write_kernel_doorbell64(void __iomem *db, u64 value) 1949d7d0248SFelix Kuehling { 1959d7d0248SFelix Kuehling if (db) { 1969d7d0248SFelix Kuehling WARN(((unsigned long)db & 7) != 0, 1979d7d0248SFelix Kuehling "Unaligned 64-bit doorbell"); 1989d7d0248SFelix Kuehling writeq(value, (u64 __iomem *)db); 1999d7d0248SFelix Kuehling pr_debug("writing %llu to doorbell address %p\n", value, db); 2009d7d0248SFelix Kuehling } 2019d7d0248SFelix Kuehling } 2029d7d0248SFelix Kuehling 203339903faSYong Zhao unsigned int kfd_get_doorbell_dw_offset_in_bar(struct kfd_dev *kfd, 20459d7115dSMukul Joshi struct kfd_process_device *pdd, 205ef568db7SFelix Kuehling unsigned int doorbell_id) 20619f6d2a6SOded Gabbay { 20719f6d2a6SOded Gabbay /* 208339903faSYong Zhao * doorbell_base_dw_offset accounts for doorbells taken by KGD. 209ada2b29cSFelix Kuehling * index * kfd_doorbell_process_slice/sizeof(u32) adjusts to 210ada2b29cSFelix Kuehling * the process's doorbells. The offset returned is in dword 211ada2b29cSFelix Kuehling * units regardless of the ASIC-dependent doorbell size. 21219f6d2a6SOded Gabbay */ 213cc009e61SMukul Joshi if (!kfd->shared_resources.enable_mes) 214339903faSYong Zhao return kfd->doorbell_base_dw_offset + 21559d7115dSMukul Joshi pdd->doorbell_index 216ada2b29cSFelix Kuehling * kfd_doorbell_process_slice(kfd) / sizeof(u32) + 217cc009e61SMukul Joshi doorbell_id * 218cc009e61SMukul Joshi kfd->device_info.doorbell_size / sizeof(u32); 219cc009e61SMukul Joshi else 220cc009e61SMukul Joshi return amdgpu_mes_get_doorbell_dw_offset_in_bar( 221cc009e61SMukul Joshi (struct amdgpu_device *)kfd->adev, 222cc009e61SMukul Joshi pdd->doorbell_index, doorbell_id); 22319f6d2a6SOded Gabbay } 22419f6d2a6SOded Gabbay 22519f6d2a6SOded Gabbay uint64_t kfd_get_number_elems(struct kfd_dev *kfd) 22619f6d2a6SOded Gabbay { 22719f6d2a6SOded Gabbay uint64_t num_of_elems = (kfd->shared_resources.doorbell_aperture_size - 22819f6d2a6SOded Gabbay kfd->shared_resources.doorbell_start_offset) / 229ada2b29cSFelix Kuehling kfd_doorbell_process_slice(kfd) + 1; 23019f6d2a6SOded Gabbay 23119f6d2a6SOded Gabbay return num_of_elems; 23219f6d2a6SOded Gabbay 23319f6d2a6SOded Gabbay } 23419f6d2a6SOded Gabbay 235*2105a15aSShashank Sharma static int init_doorbell_bitmap(struct qcm_process_device *qpd, 236*2105a15aSShashank Sharma struct kfd_dev *dev) 23719f6d2a6SOded Gabbay { 238*2105a15aSShashank Sharma unsigned int i; 239*2105a15aSShashank Sharma int range_start = dev->shared_resources.non_cp_doorbells_start; 240*2105a15aSShashank Sharma int range_end = dev->shared_resources.non_cp_doorbells_end; 241*2105a15aSShashank Sharma 242*2105a15aSShashank Sharma if (!KFD_IS_SOC15(dev)) 243*2105a15aSShashank Sharma return 0; 244*2105a15aSShashank Sharma 245*2105a15aSShashank Sharma /* Mask out doorbells reserved for SDMA, IH, and VCN on SOC15. */ 246*2105a15aSShashank Sharma pr_debug("reserved doorbell 0x%03x - 0x%03x\n", range_start, range_end); 247*2105a15aSShashank Sharma pr_debug("reserved doorbell 0x%03x - 0x%03x\n", 248*2105a15aSShashank Sharma range_start + KFD_QUEUE_DOORBELL_MIRROR_OFFSET, 249*2105a15aSShashank Sharma range_end + KFD_QUEUE_DOORBELL_MIRROR_OFFSET); 250*2105a15aSShashank Sharma 251*2105a15aSShashank Sharma for (i = 0; i < KFD_MAX_NUM_OF_QUEUES_PER_PROCESS / 2; i++) { 252*2105a15aSShashank Sharma if (i >= range_start && i <= range_end) { 253*2105a15aSShashank Sharma __set_bit(i, qpd->doorbell_bitmap); 254*2105a15aSShashank Sharma __set_bit(i + KFD_QUEUE_DOORBELL_MIRROR_OFFSET, 255*2105a15aSShashank Sharma qpd->doorbell_bitmap); 256*2105a15aSShashank Sharma } 257*2105a15aSShashank Sharma } 258*2105a15aSShashank Sharma 25916f00131SFelix Kuehling return 0; 26016f00131SFelix Kuehling } 26116f00131SFelix Kuehling 262*2105a15aSShashank Sharma phys_addr_t kfd_get_process_doorbells(struct kfd_process_device *pdd) 263*2105a15aSShashank Sharma { 264*2105a15aSShashank Sharma struct amdgpu_device *adev = pdd->dev->adev; 265*2105a15aSShashank Sharma uint32_t first_db_index; 266*2105a15aSShashank Sharma 267*2105a15aSShashank Sharma if (!pdd->qpd.proc_doorbells) { 268*2105a15aSShashank Sharma if (kfd_alloc_process_doorbells(pdd->dev->kfd, pdd)) 269*2105a15aSShashank Sharma /* phys_addr_t 0 is error */ 270*2105a15aSShashank Sharma return 0; 271a91e70e3SFelix Kuehling } 272a91e70e3SFelix Kuehling 273*2105a15aSShashank Sharma first_db_index = amdgpu_doorbell_index_on_bar(adev, pdd->qpd.proc_doorbells, 0); 274*2105a15aSShashank Sharma return adev->doorbell.base + first_db_index * sizeof(uint32_t); 275*2105a15aSShashank Sharma } 276*2105a15aSShashank Sharma 277*2105a15aSShashank Sharma int kfd_alloc_process_doorbells(struct kfd_dev *kfd, struct kfd_process_device *pdd) 278a91e70e3SFelix Kuehling { 279*2105a15aSShashank Sharma int r; 280*2105a15aSShashank Sharma struct qcm_process_device *qpd = &pdd->qpd; 281cc009e61SMukul Joshi 282*2105a15aSShashank Sharma /* Allocate bitmap for dynamic doorbell allocation */ 283*2105a15aSShashank Sharma qpd->doorbell_bitmap = bitmap_zalloc(KFD_MAX_NUM_OF_QUEUES_PER_PROCESS, 284*2105a15aSShashank Sharma GFP_KERNEL); 285*2105a15aSShashank Sharma if (!qpd->doorbell_bitmap) { 286*2105a15aSShashank Sharma DRM_ERROR("Failed to allocate process doorbell bitmap\n"); 287*2105a15aSShashank Sharma return -ENOMEM; 288*2105a15aSShashank Sharma } 289cc009e61SMukul Joshi 290*2105a15aSShashank Sharma r = init_doorbell_bitmap(&pdd->qpd, kfd); 291*2105a15aSShashank Sharma if (r) { 292*2105a15aSShashank Sharma DRM_ERROR("Failed to initialize process doorbells\n"); 293*2105a15aSShashank Sharma r = -ENOMEM; 294*2105a15aSShashank Sharma goto err; 295*2105a15aSShashank Sharma } 296a91e70e3SFelix Kuehling 297*2105a15aSShashank Sharma /* Allocate doorbells for this process */ 298*2105a15aSShashank Sharma r = amdgpu_bo_create_kernel(kfd->adev, 299*2105a15aSShashank Sharma kfd_doorbell_process_slice(kfd), 300*2105a15aSShashank Sharma PAGE_SIZE, 301*2105a15aSShashank Sharma AMDGPU_GEM_DOMAIN_DOORBELL, 302*2105a15aSShashank Sharma &qpd->proc_doorbells, 303*2105a15aSShashank Sharma NULL, 304*2105a15aSShashank Sharma NULL); 305*2105a15aSShashank Sharma if (r) { 306*2105a15aSShashank Sharma DRM_ERROR("Failed to allocate process doorbells\n"); 307*2105a15aSShashank Sharma goto err; 308*2105a15aSShashank Sharma } 309*2105a15aSShashank Sharma return 0; 310a4a3798fSRajneesh Bhardwaj 311*2105a15aSShashank Sharma err: 312*2105a15aSShashank Sharma bitmap_free(qpd->doorbell_bitmap); 313*2105a15aSShashank Sharma qpd->doorbell_bitmap = NULL; 314a91e70e3SFelix Kuehling return r; 315a91e70e3SFelix Kuehling } 316a91e70e3SFelix Kuehling 317*2105a15aSShashank Sharma void kfd_free_process_doorbells(struct kfd_dev *kfd, struct kfd_process_device *pdd) 318a91e70e3SFelix Kuehling { 319*2105a15aSShashank Sharma struct qcm_process_device *qpd = &pdd->qpd; 320*2105a15aSShashank Sharma 321*2105a15aSShashank Sharma if (qpd->doorbell_bitmap) { 322*2105a15aSShashank Sharma bitmap_free(qpd->doorbell_bitmap); 323*2105a15aSShashank Sharma qpd->doorbell_bitmap = NULL; 324cc009e61SMukul Joshi } 325*2105a15aSShashank Sharma 326*2105a15aSShashank Sharma amdgpu_bo_free_kernel(&qpd->proc_doorbells, NULL, NULL); 32719f6d2a6SOded Gabbay } 328