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 { 6419f6d2a6SOded Gabbay size_t doorbell_start_offset; 6519f6d2a6SOded Gabbay size_t doorbell_aperture_size; 6619f6d2a6SOded Gabbay size_t doorbell_process_limit; 6719f6d2a6SOded Gabbay 6819f6d2a6SOded Gabbay /* 69cc009e61SMukul Joshi * With MES enabled, just set the doorbell base as it is needed 70cc009e61SMukul Joshi * to calculate doorbell physical address. 71cc009e61SMukul Joshi */ 72cc009e61SMukul Joshi if (kfd->shared_resources.enable_mes) { 73cc009e61SMukul Joshi kfd->doorbell_base = 74cc009e61SMukul Joshi kfd->shared_resources.doorbell_physical_address; 75cc009e61SMukul Joshi return 0; 76cc009e61SMukul Joshi } 77cc009e61SMukul Joshi 78cc009e61SMukul Joshi /* 7919f6d2a6SOded Gabbay * We start with calculations in bytes because the input data might 8019f6d2a6SOded Gabbay * only be byte-aligned. 8119f6d2a6SOded Gabbay * Only after we have done the rounding can we assume any alignment. 8219f6d2a6SOded Gabbay */ 8319f6d2a6SOded Gabbay 8419f6d2a6SOded Gabbay doorbell_start_offset = 8519f6d2a6SOded Gabbay roundup(kfd->shared_resources.doorbell_start_offset, 86ada2b29cSFelix Kuehling kfd_doorbell_process_slice(kfd)); 8719f6d2a6SOded Gabbay 8819f6d2a6SOded Gabbay doorbell_aperture_size = 8919f6d2a6SOded Gabbay rounddown(kfd->shared_resources.doorbell_aperture_size, 90ada2b29cSFelix Kuehling kfd_doorbell_process_slice(kfd)); 9119f6d2a6SOded Gabbay 9219f6d2a6SOded Gabbay if (doorbell_aperture_size > doorbell_start_offset) 9319f6d2a6SOded Gabbay doorbell_process_limit = 9419f6d2a6SOded Gabbay (doorbell_aperture_size - doorbell_start_offset) / 95ada2b29cSFelix Kuehling kfd_doorbell_process_slice(kfd); 9619f6d2a6SOded Gabbay else 97a91e70e3SFelix Kuehling return -ENOSPC; 98a91e70e3SFelix Kuehling 9959d7115dSMukul Joshi if (!kfd->max_doorbell_slices || 10059d7115dSMukul Joshi doorbell_process_limit < kfd->max_doorbell_slices) 10159d7115dSMukul Joshi kfd->max_doorbell_slices = doorbell_process_limit; 10219f6d2a6SOded Gabbay 10319f6d2a6SOded Gabbay kfd->doorbell_base = kfd->shared_resources.doorbell_physical_address + 10419f6d2a6SOded Gabbay doorbell_start_offset; 10519f6d2a6SOded Gabbay 106339903faSYong Zhao kfd->doorbell_base_dw_offset = doorbell_start_offset / sizeof(u32); 10719f6d2a6SOded Gabbay 10819f6d2a6SOded Gabbay kfd->doorbell_kernel_ptr = ioremap(kfd->doorbell_base, 109ada2b29cSFelix Kuehling kfd_doorbell_process_slice(kfd)); 11019f6d2a6SOded Gabbay 111735df2baSFelix Kuehling if (!kfd->doorbell_kernel_ptr) 112735df2baSFelix Kuehling return -ENOMEM; 11319f6d2a6SOded Gabbay 11479775b62SKent Russell pr_debug("Doorbell initialization:\n"); 11579775b62SKent Russell pr_debug("doorbell base == 0x%08lX\n", 11619f6d2a6SOded Gabbay (uintptr_t)kfd->doorbell_base); 11719f6d2a6SOded Gabbay 118339903faSYong Zhao pr_debug("doorbell_base_dw_offset == 0x%08lX\n", 119339903faSYong Zhao kfd->doorbell_base_dw_offset); 12019f6d2a6SOded Gabbay 12179775b62SKent Russell pr_debug("doorbell_process_limit == 0x%08lX\n", 12219f6d2a6SOded Gabbay doorbell_process_limit); 12319f6d2a6SOded Gabbay 12479775b62SKent Russell pr_debug("doorbell_kernel_offset == 0x%08lX\n", 12519f6d2a6SOded Gabbay (uintptr_t)kfd->doorbell_base); 12619f6d2a6SOded Gabbay 12779775b62SKent Russell pr_debug("doorbell aperture size == 0x%08lX\n", 12819f6d2a6SOded Gabbay kfd->shared_resources.doorbell_aperture_size); 12919f6d2a6SOded Gabbay 1308f8fb9b9SKent Russell pr_debug("doorbell kernel address == %p\n", kfd->doorbell_kernel_ptr); 131735df2baSFelix Kuehling 132735df2baSFelix Kuehling return 0; 133735df2baSFelix Kuehling } 134735df2baSFelix Kuehling 135735df2baSFelix Kuehling void kfd_doorbell_fini(struct kfd_dev *kfd) 136735df2baSFelix Kuehling { 137735df2baSFelix Kuehling if (kfd->doorbell_kernel_ptr) 138735df2baSFelix Kuehling iounmap(kfd->doorbell_kernel_ptr); 13919f6d2a6SOded Gabbay } 14019f6d2a6SOded Gabbay 141df03ef93SHarish Kasiviswanathan int kfd_doorbell_mmap(struct kfd_dev *dev, struct kfd_process *process, 142df03ef93SHarish Kasiviswanathan struct vm_area_struct *vma) 14319f6d2a6SOded Gabbay { 14419f6d2a6SOded Gabbay phys_addr_t address; 14559d7115dSMukul Joshi struct kfd_process_device *pdd; 146ada2b29cSFelix Kuehling 14719f6d2a6SOded Gabbay /* 14819f6d2a6SOded Gabbay * For simplicitly we only allow mapping of the entire doorbell 14919f6d2a6SOded Gabbay * allocation of a single device & process. 15019f6d2a6SOded Gabbay */ 151ada2b29cSFelix Kuehling if (vma->vm_end - vma->vm_start != kfd_doorbell_process_slice(dev)) 15219f6d2a6SOded Gabbay return -EINVAL; 15319f6d2a6SOded Gabbay 15459d7115dSMukul Joshi pdd = kfd_get_process_device_data(dev, process); 15559d7115dSMukul Joshi if (!pdd) 15659d7115dSMukul Joshi return -EINVAL; 15719f6d2a6SOded Gabbay 15859d7115dSMukul Joshi /* Calculate physical address of doorbell */ 15959d7115dSMukul Joshi address = kfd_get_process_doorbells(pdd); 160*16f00131SFelix Kuehling if (!address) 161*16f00131SFelix Kuehling return -ENOMEM; 16219f6d2a6SOded Gabbay vma->vm_flags |= VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_NORESERVE | 16319f6d2a6SOded Gabbay VM_DONTDUMP | VM_PFNMAP; 16419f6d2a6SOded Gabbay 16519f6d2a6SOded Gabbay vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 16619f6d2a6SOded Gabbay 16779775b62SKent Russell pr_debug("Mapping doorbell page\n" 1686f4d92a1SEdward O'Callaghan " target user address == 0x%08llX\n" 1696f4d92a1SEdward O'Callaghan " physical address == 0x%08llX\n" 1706f4d92a1SEdward O'Callaghan " vm_flags == 0x%04lX\n" 1716f4d92a1SEdward O'Callaghan " size == 0x%04lX\n", 1726f4d92a1SEdward O'Callaghan (unsigned long long) vma->vm_start, address, vma->vm_flags, 173ada2b29cSFelix Kuehling kfd_doorbell_process_slice(dev)); 17419f6d2a6SOded Gabbay 1756f4d92a1SEdward O'Callaghan 17619f6d2a6SOded Gabbay return io_remap_pfn_range(vma, 17719f6d2a6SOded Gabbay vma->vm_start, 17819f6d2a6SOded Gabbay address >> PAGE_SHIFT, 179ada2b29cSFelix Kuehling kfd_doorbell_process_slice(dev), 18019f6d2a6SOded Gabbay vma->vm_page_prot); 18119f6d2a6SOded Gabbay } 18219f6d2a6SOded Gabbay 18319f6d2a6SOded Gabbay 18419f6d2a6SOded Gabbay /* get kernel iomem pointer for a doorbell */ 185ada2b29cSFelix Kuehling void __iomem *kfd_get_kernel_doorbell(struct kfd_dev *kfd, 18619f6d2a6SOded Gabbay unsigned int *doorbell_off) 18719f6d2a6SOded Gabbay { 18819f6d2a6SOded Gabbay u32 inx; 18919f6d2a6SOded Gabbay 190cea405b1SXihan Zhang mutex_lock(&kfd->doorbell_mutex); 191cea405b1SXihan Zhang inx = find_first_zero_bit(kfd->doorbell_available_index, 19219f6d2a6SOded Gabbay KFD_MAX_NUM_OF_QUEUES_PER_PROCESS); 19319f6d2a6SOded Gabbay 194cea405b1SXihan Zhang __set_bit(inx, kfd->doorbell_available_index); 195cea405b1SXihan Zhang mutex_unlock(&kfd->doorbell_mutex); 19619f6d2a6SOded Gabbay 19719f6d2a6SOded Gabbay if (inx >= KFD_MAX_NUM_OF_QUEUES_PER_PROCESS) 19819f6d2a6SOded Gabbay return NULL; 19919f6d2a6SOded Gabbay 200f0dc99a6SGraham Sider inx *= kfd->device_info.doorbell_size / sizeof(u32); 201ada2b29cSFelix Kuehling 20219f6d2a6SOded Gabbay /* 203a91e70e3SFelix Kuehling * Calculating the kernel doorbell offset using the first 204a91e70e3SFelix Kuehling * doorbell page. 20519f6d2a6SOded Gabbay */ 206339903faSYong Zhao *doorbell_off = kfd->doorbell_base_dw_offset + inx; 20719f6d2a6SOded Gabbay 20879775b62SKent Russell pr_debug("Get kernel queue doorbell\n" 2096dae6162SColin Ian King " doorbell offset == 0x%08X\n" 210951df6d9SShaoyun Liu " doorbell index == 0x%x\n", 211951df6d9SShaoyun Liu *doorbell_off, inx); 21219f6d2a6SOded Gabbay 21319f6d2a6SOded Gabbay return kfd->doorbell_kernel_ptr + inx; 21419f6d2a6SOded Gabbay } 21519f6d2a6SOded Gabbay 21619f6d2a6SOded Gabbay void kfd_release_kernel_doorbell(struct kfd_dev *kfd, u32 __iomem *db_addr) 21719f6d2a6SOded Gabbay { 21819f6d2a6SOded Gabbay unsigned int inx; 21919f6d2a6SOded Gabbay 220951df6d9SShaoyun Liu inx = (unsigned int)(db_addr - kfd->doorbell_kernel_ptr) 221f0dc99a6SGraham Sider * sizeof(u32) / kfd->device_info.doorbell_size; 22219f6d2a6SOded Gabbay 223cea405b1SXihan Zhang mutex_lock(&kfd->doorbell_mutex); 224cea405b1SXihan Zhang __clear_bit(inx, kfd->doorbell_available_index); 225cea405b1SXihan Zhang mutex_unlock(&kfd->doorbell_mutex); 22619f6d2a6SOded Gabbay } 22719f6d2a6SOded Gabbay 228ada2b29cSFelix Kuehling void write_kernel_doorbell(void __iomem *db, u32 value) 22919f6d2a6SOded Gabbay { 23019f6d2a6SOded Gabbay if (db) { 23119f6d2a6SOded Gabbay writel(value, db); 2328f8fb9b9SKent Russell pr_debug("Writing %d to doorbell address %p\n", value, db); 23319f6d2a6SOded Gabbay } 23419f6d2a6SOded Gabbay } 23519f6d2a6SOded Gabbay 2369d7d0248SFelix Kuehling void write_kernel_doorbell64(void __iomem *db, u64 value) 2379d7d0248SFelix Kuehling { 2389d7d0248SFelix Kuehling if (db) { 2399d7d0248SFelix Kuehling WARN(((unsigned long)db & 7) != 0, 2409d7d0248SFelix Kuehling "Unaligned 64-bit doorbell"); 2419d7d0248SFelix Kuehling writeq(value, (u64 __iomem *)db); 2429d7d0248SFelix Kuehling pr_debug("writing %llu to doorbell address %p\n", value, db); 2439d7d0248SFelix Kuehling } 2449d7d0248SFelix Kuehling } 2459d7d0248SFelix Kuehling 246339903faSYong Zhao unsigned int kfd_get_doorbell_dw_offset_in_bar(struct kfd_dev *kfd, 24759d7115dSMukul Joshi struct kfd_process_device *pdd, 248ef568db7SFelix Kuehling unsigned int doorbell_id) 24919f6d2a6SOded Gabbay { 25019f6d2a6SOded Gabbay /* 251339903faSYong Zhao * doorbell_base_dw_offset accounts for doorbells taken by KGD. 252ada2b29cSFelix Kuehling * index * kfd_doorbell_process_slice/sizeof(u32) adjusts to 253ada2b29cSFelix Kuehling * the process's doorbells. The offset returned is in dword 254ada2b29cSFelix Kuehling * units regardless of the ASIC-dependent doorbell size. 25519f6d2a6SOded Gabbay */ 256cc009e61SMukul Joshi if (!kfd->shared_resources.enable_mes) 257339903faSYong Zhao return kfd->doorbell_base_dw_offset + 25859d7115dSMukul Joshi pdd->doorbell_index 259ada2b29cSFelix Kuehling * kfd_doorbell_process_slice(kfd) / sizeof(u32) + 260cc009e61SMukul Joshi doorbell_id * 261cc009e61SMukul Joshi kfd->device_info.doorbell_size / sizeof(u32); 262cc009e61SMukul Joshi else 263cc009e61SMukul Joshi return amdgpu_mes_get_doorbell_dw_offset_in_bar( 264cc009e61SMukul Joshi (struct amdgpu_device *)kfd->adev, 265cc009e61SMukul Joshi pdd->doorbell_index, doorbell_id); 26619f6d2a6SOded Gabbay } 26719f6d2a6SOded Gabbay 26819f6d2a6SOded Gabbay uint64_t kfd_get_number_elems(struct kfd_dev *kfd) 26919f6d2a6SOded Gabbay { 27019f6d2a6SOded Gabbay uint64_t num_of_elems = (kfd->shared_resources.doorbell_aperture_size - 27119f6d2a6SOded Gabbay kfd->shared_resources.doorbell_start_offset) / 272ada2b29cSFelix Kuehling kfd_doorbell_process_slice(kfd) + 1; 27319f6d2a6SOded Gabbay 27419f6d2a6SOded Gabbay return num_of_elems; 27519f6d2a6SOded Gabbay 27619f6d2a6SOded Gabbay } 27719f6d2a6SOded Gabbay 27859d7115dSMukul Joshi phys_addr_t kfd_get_process_doorbells(struct kfd_process_device *pdd) 27919f6d2a6SOded Gabbay { 280*16f00131SFelix Kuehling if (!pdd->doorbell_index) { 281*16f00131SFelix Kuehling int r = kfd_alloc_process_doorbells(pdd->dev, 282*16f00131SFelix Kuehling &pdd->doorbell_index); 283*16f00131SFelix Kuehling if (r) 284*16f00131SFelix Kuehling return 0; 285*16f00131SFelix Kuehling } 286*16f00131SFelix Kuehling 28759d7115dSMukul Joshi return pdd->dev->doorbell_base + 28859d7115dSMukul Joshi pdd->doorbell_index * kfd_doorbell_process_slice(pdd->dev); 289a91e70e3SFelix Kuehling } 290a91e70e3SFelix Kuehling 29159d7115dSMukul Joshi int kfd_alloc_process_doorbells(struct kfd_dev *kfd, unsigned int *doorbell_index) 292a91e70e3SFelix Kuehling { 293cc009e61SMukul Joshi int r = 0; 294cc009e61SMukul Joshi 295cc009e61SMukul Joshi if (!kfd->shared_resources.enable_mes) 296cc009e61SMukul Joshi r = ida_simple_get(&kfd->doorbell_ida, 1, 297cc009e61SMukul Joshi kfd->max_doorbell_slices, GFP_KERNEL); 298cc009e61SMukul Joshi else 299cc009e61SMukul Joshi r = amdgpu_mes_alloc_process_doorbells( 300cc009e61SMukul Joshi (struct amdgpu_device *)kfd->adev, 301cc009e61SMukul Joshi doorbell_index); 302cc009e61SMukul Joshi 303a91e70e3SFelix Kuehling if (r > 0) 30459d7115dSMukul Joshi *doorbell_index = r; 305a91e70e3SFelix Kuehling 306a91e70e3SFelix Kuehling return r; 307a91e70e3SFelix Kuehling } 308a91e70e3SFelix Kuehling 30959d7115dSMukul Joshi void kfd_free_process_doorbells(struct kfd_dev *kfd, unsigned int doorbell_index) 310a91e70e3SFelix Kuehling { 311cc009e61SMukul Joshi if (doorbell_index) { 312cc009e61SMukul Joshi if (!kfd->shared_resources.enable_mes) 31359d7115dSMukul Joshi ida_simple_remove(&kfd->doorbell_ida, doorbell_index); 314cc009e61SMukul Joshi else 315cc009e61SMukul Joshi amdgpu_mes_free_process_doorbells( 316cc009e61SMukul Joshi (struct amdgpu_device *)kfd->adev, 317cc009e61SMukul Joshi doorbell_index); 318cc009e61SMukul Joshi } 31919f6d2a6SOded Gabbay } 320