119f6d2a6SOded Gabbay /* 219f6d2a6SOded Gabbay * Copyright 2014 Advanced Micro Devices, Inc. 319f6d2a6SOded Gabbay * 419f6d2a6SOded Gabbay * Permission is hereby granted, free of charge, to any person obtaining a 519f6d2a6SOded Gabbay * copy of this software and associated documentation files (the "Software"), 619f6d2a6SOded Gabbay * to deal in the Software without restriction, including without limitation 719f6d2a6SOded Gabbay * the rights to use, copy, modify, merge, publish, distribute, sublicense, 819f6d2a6SOded Gabbay * and/or sell copies of the Software, and to permit persons to whom the 919f6d2a6SOded Gabbay * Software is furnished to do so, subject to the following conditions: 1019f6d2a6SOded Gabbay * 1119f6d2a6SOded Gabbay * The above copyright notice and this permission notice shall be included in 1219f6d2a6SOded Gabbay * all copies or substantial portions of the Software. 1319f6d2a6SOded Gabbay * 1419f6d2a6SOded Gabbay * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 1519f6d2a6SOded Gabbay * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 1619f6d2a6SOded Gabbay * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 1719f6d2a6SOded Gabbay * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 1819f6d2a6SOded Gabbay * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 1919f6d2a6SOded Gabbay * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 2019f6d2a6SOded Gabbay * OTHER DEALINGS IN THE SOFTWARE. 2119f6d2a6SOded Gabbay */ 2219f6d2a6SOded Gabbay #include "kfd_priv.h" 2319f6d2a6SOded Gabbay #include <linux/mm.h> 2419f6d2a6SOded Gabbay #include <linux/mman.h> 2519f6d2a6SOded Gabbay #include <linux/slab.h> 26824cb7d1SOded Gabbay #include <linux/io.h> 27a91e70e3SFelix Kuehling #include <linux/idr.h> 2819f6d2a6SOded Gabbay 2919f6d2a6SOded Gabbay /* 30a91e70e3SFelix Kuehling * This extension supports a kernel level doorbells management for the 31a91e70e3SFelix Kuehling * kernel queues using the first doorbell page reserved for the kernel. 3219f6d2a6SOded Gabbay */ 3319f6d2a6SOded Gabbay 34a91e70e3SFelix Kuehling static DEFINE_IDA(doorbell_ida); 35a91e70e3SFelix Kuehling static unsigned int max_doorbell_slices; 3619f6d2a6SOded Gabbay #define KFD_SIZE_OF_DOORBELL_IN_BYTES 4 3719f6d2a6SOded Gabbay 3819f6d2a6SOded Gabbay /* 3919f6d2a6SOded Gabbay * Each device exposes a doorbell aperture, a PCI MMIO aperture that 4019f6d2a6SOded Gabbay * receives 32-bit writes that are passed to queues as wptr values. 4119f6d2a6SOded Gabbay * The doorbells are intended to be written by applications as part 4219f6d2a6SOded Gabbay * of queueing work on user-mode queues. 4319f6d2a6SOded Gabbay * We assign doorbells to applications in PAGE_SIZE-sized and aligned chunks. 4419f6d2a6SOded Gabbay * We map the doorbell address space into user-mode when a process creates 4519f6d2a6SOded Gabbay * its first queue on each device. 4619f6d2a6SOded Gabbay * Although the mapping is done by KFD, it is equivalent to an mmap of 4719f6d2a6SOded Gabbay * the /dev/kfd with the particular device encoded in the mmap offset. 4819f6d2a6SOded Gabbay * There will be other uses for mmap of /dev/kfd, so only a range of 4919f6d2a6SOded Gabbay * offsets (KFD_MMAP_DOORBELL_START-END) is used for doorbells. 5019f6d2a6SOded Gabbay */ 5119f6d2a6SOded Gabbay 5219f6d2a6SOded Gabbay /* # of doorbell bytes allocated for each process. */ 5319f6d2a6SOded Gabbay static inline size_t doorbell_process_allocation(void) 5419f6d2a6SOded Gabbay { 5519f6d2a6SOded Gabbay return roundup(KFD_SIZE_OF_DOORBELL_IN_BYTES * 5619f6d2a6SOded Gabbay KFD_MAX_NUM_OF_QUEUES_PER_PROCESS, 5719f6d2a6SOded Gabbay PAGE_SIZE); 5819f6d2a6SOded Gabbay } 5919f6d2a6SOded Gabbay 6019f6d2a6SOded Gabbay /* Doorbell calculations for device init. */ 61735df2baSFelix Kuehling int kfd_doorbell_init(struct kfd_dev *kfd) 6219f6d2a6SOded Gabbay { 6319f6d2a6SOded Gabbay size_t doorbell_start_offset; 6419f6d2a6SOded Gabbay size_t doorbell_aperture_size; 6519f6d2a6SOded Gabbay size_t doorbell_process_limit; 6619f6d2a6SOded Gabbay 6719f6d2a6SOded Gabbay /* 6819f6d2a6SOded Gabbay * We start with calculations in bytes because the input data might 6919f6d2a6SOded Gabbay * only be byte-aligned. 7019f6d2a6SOded Gabbay * Only after we have done the rounding can we assume any alignment. 7119f6d2a6SOded Gabbay */ 7219f6d2a6SOded Gabbay 7319f6d2a6SOded Gabbay doorbell_start_offset = 7419f6d2a6SOded Gabbay roundup(kfd->shared_resources.doorbell_start_offset, 7519f6d2a6SOded Gabbay doorbell_process_allocation()); 7619f6d2a6SOded Gabbay 7719f6d2a6SOded Gabbay doorbell_aperture_size = 7819f6d2a6SOded Gabbay rounddown(kfd->shared_resources.doorbell_aperture_size, 7919f6d2a6SOded Gabbay doorbell_process_allocation()); 8019f6d2a6SOded Gabbay 8119f6d2a6SOded Gabbay if (doorbell_aperture_size > doorbell_start_offset) 8219f6d2a6SOded Gabbay doorbell_process_limit = 8319f6d2a6SOded Gabbay (doorbell_aperture_size - doorbell_start_offset) / 8419f6d2a6SOded Gabbay doorbell_process_allocation(); 8519f6d2a6SOded Gabbay else 86a91e70e3SFelix Kuehling return -ENOSPC; 87a91e70e3SFelix Kuehling 88a91e70e3SFelix Kuehling if (!max_doorbell_slices || 89a91e70e3SFelix Kuehling doorbell_process_limit < max_doorbell_slices) 90a91e70e3SFelix Kuehling max_doorbell_slices = doorbell_process_limit; 9119f6d2a6SOded Gabbay 9219f6d2a6SOded Gabbay kfd->doorbell_base = kfd->shared_resources.doorbell_physical_address + 9319f6d2a6SOded Gabbay doorbell_start_offset; 9419f6d2a6SOded Gabbay 9519f6d2a6SOded Gabbay kfd->doorbell_id_offset = doorbell_start_offset / sizeof(u32); 9619f6d2a6SOded Gabbay 9719f6d2a6SOded Gabbay kfd->doorbell_kernel_ptr = ioremap(kfd->doorbell_base, 9819f6d2a6SOded Gabbay doorbell_process_allocation()); 9919f6d2a6SOded Gabbay 100735df2baSFelix Kuehling if (!kfd->doorbell_kernel_ptr) 101735df2baSFelix Kuehling return -ENOMEM; 10219f6d2a6SOded Gabbay 10379775b62SKent Russell pr_debug("Doorbell initialization:\n"); 10479775b62SKent Russell pr_debug("doorbell base == 0x%08lX\n", 10519f6d2a6SOded Gabbay (uintptr_t)kfd->doorbell_base); 10619f6d2a6SOded Gabbay 10779775b62SKent Russell pr_debug("doorbell_id_offset == 0x%08lX\n", 10819f6d2a6SOded Gabbay kfd->doorbell_id_offset); 10919f6d2a6SOded Gabbay 11079775b62SKent Russell pr_debug("doorbell_process_limit == 0x%08lX\n", 11119f6d2a6SOded Gabbay doorbell_process_limit); 11219f6d2a6SOded Gabbay 11379775b62SKent Russell pr_debug("doorbell_kernel_offset == 0x%08lX\n", 11419f6d2a6SOded Gabbay (uintptr_t)kfd->doorbell_base); 11519f6d2a6SOded Gabbay 11679775b62SKent Russell pr_debug("doorbell aperture size == 0x%08lX\n", 11719f6d2a6SOded Gabbay kfd->shared_resources.doorbell_aperture_size); 11819f6d2a6SOded Gabbay 1198f8fb9b9SKent Russell pr_debug("doorbell kernel address == %p\n", kfd->doorbell_kernel_ptr); 120735df2baSFelix Kuehling 121735df2baSFelix Kuehling return 0; 122735df2baSFelix Kuehling } 123735df2baSFelix Kuehling 124735df2baSFelix Kuehling void kfd_doorbell_fini(struct kfd_dev *kfd) 125735df2baSFelix Kuehling { 126735df2baSFelix Kuehling if (kfd->doorbell_kernel_ptr) 127735df2baSFelix Kuehling iounmap(kfd->doorbell_kernel_ptr); 12819f6d2a6SOded Gabbay } 12919f6d2a6SOded Gabbay 13019f6d2a6SOded Gabbay int kfd_doorbell_mmap(struct kfd_process *process, struct vm_area_struct *vma) 13119f6d2a6SOded Gabbay { 13219f6d2a6SOded Gabbay phys_addr_t address; 13319f6d2a6SOded Gabbay struct kfd_dev *dev; 13419f6d2a6SOded Gabbay 13519f6d2a6SOded Gabbay /* 13619f6d2a6SOded Gabbay * For simplicitly we only allow mapping of the entire doorbell 13719f6d2a6SOded Gabbay * allocation of a single device & process. 13819f6d2a6SOded Gabbay */ 13919f6d2a6SOded Gabbay if (vma->vm_end - vma->vm_start != doorbell_process_allocation()) 14019f6d2a6SOded Gabbay return -EINVAL; 14119f6d2a6SOded Gabbay 14219f6d2a6SOded Gabbay /* Find kfd device according to gpu id */ 14319f6d2a6SOded Gabbay dev = kfd_device_by_id(vma->vm_pgoff); 1444eacc26bSKent Russell if (!dev) 14519f6d2a6SOded Gabbay return -EINVAL; 14619f6d2a6SOded Gabbay 14719f6d2a6SOded Gabbay /* Calculate physical address of doorbell */ 14819f6d2a6SOded Gabbay address = kfd_get_process_doorbells(dev, process); 14919f6d2a6SOded Gabbay 15019f6d2a6SOded Gabbay vma->vm_flags |= VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_NORESERVE | 15119f6d2a6SOded Gabbay VM_DONTDUMP | VM_PFNMAP; 15219f6d2a6SOded Gabbay 15319f6d2a6SOded Gabbay vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 15419f6d2a6SOded Gabbay 15579775b62SKent Russell pr_debug("Mapping doorbell page\n" 1566f4d92a1SEdward O'Callaghan " target user address == 0x%08llX\n" 1576f4d92a1SEdward O'Callaghan " physical address == 0x%08llX\n" 1586f4d92a1SEdward O'Callaghan " vm_flags == 0x%04lX\n" 1596f4d92a1SEdward O'Callaghan " size == 0x%04lX\n", 1606f4d92a1SEdward O'Callaghan (unsigned long long) vma->vm_start, address, vma->vm_flags, 16119f6d2a6SOded Gabbay doorbell_process_allocation()); 16219f6d2a6SOded Gabbay 1636f4d92a1SEdward O'Callaghan 16419f6d2a6SOded Gabbay return io_remap_pfn_range(vma, 16519f6d2a6SOded Gabbay vma->vm_start, 16619f6d2a6SOded Gabbay address >> PAGE_SHIFT, 16719f6d2a6SOded Gabbay doorbell_process_allocation(), 16819f6d2a6SOded Gabbay vma->vm_page_prot); 16919f6d2a6SOded Gabbay } 17019f6d2a6SOded Gabbay 17119f6d2a6SOded Gabbay 17219f6d2a6SOded Gabbay /* get kernel iomem pointer for a doorbell */ 17319f6d2a6SOded Gabbay u32 __iomem *kfd_get_kernel_doorbell(struct kfd_dev *kfd, 17419f6d2a6SOded Gabbay unsigned int *doorbell_off) 17519f6d2a6SOded Gabbay { 17619f6d2a6SOded Gabbay u32 inx; 17719f6d2a6SOded Gabbay 178cea405b1SXihan Zhang mutex_lock(&kfd->doorbell_mutex); 179cea405b1SXihan Zhang inx = find_first_zero_bit(kfd->doorbell_available_index, 18019f6d2a6SOded Gabbay KFD_MAX_NUM_OF_QUEUES_PER_PROCESS); 18119f6d2a6SOded Gabbay 182cea405b1SXihan Zhang __set_bit(inx, kfd->doorbell_available_index); 183cea405b1SXihan Zhang mutex_unlock(&kfd->doorbell_mutex); 18419f6d2a6SOded Gabbay 18519f6d2a6SOded Gabbay if (inx >= KFD_MAX_NUM_OF_QUEUES_PER_PROCESS) 18619f6d2a6SOded Gabbay return NULL; 18719f6d2a6SOded Gabbay 18819f6d2a6SOded Gabbay /* 189a91e70e3SFelix Kuehling * Calculating the kernel doorbell offset using the first 190a91e70e3SFelix Kuehling * doorbell page. 19119f6d2a6SOded Gabbay */ 192a91e70e3SFelix Kuehling *doorbell_off = kfd->doorbell_id_offset + inx; 19319f6d2a6SOded Gabbay 19479775b62SKent Russell pr_debug("Get kernel queue doorbell\n" 1956dae6162SColin Ian King " doorbell offset == 0x%08X\n" 1968f8fb9b9SKent Russell " kernel address == %p\n", 1978f8fb9b9SKent Russell *doorbell_off, (kfd->doorbell_kernel_ptr + inx)); 19819f6d2a6SOded Gabbay 19919f6d2a6SOded Gabbay return kfd->doorbell_kernel_ptr + inx; 20019f6d2a6SOded Gabbay } 20119f6d2a6SOded Gabbay 20219f6d2a6SOded Gabbay void kfd_release_kernel_doorbell(struct kfd_dev *kfd, u32 __iomem *db_addr) 20319f6d2a6SOded Gabbay { 20419f6d2a6SOded Gabbay unsigned int inx; 20519f6d2a6SOded Gabbay 20619f6d2a6SOded Gabbay inx = (unsigned int)(db_addr - kfd->doorbell_kernel_ptr); 20719f6d2a6SOded Gabbay 208cea405b1SXihan Zhang mutex_lock(&kfd->doorbell_mutex); 209cea405b1SXihan Zhang __clear_bit(inx, kfd->doorbell_available_index); 210cea405b1SXihan Zhang mutex_unlock(&kfd->doorbell_mutex); 21119f6d2a6SOded Gabbay } 21219f6d2a6SOded Gabbay 21319f6d2a6SOded Gabbay inline void write_kernel_doorbell(u32 __iomem *db, u32 value) 21419f6d2a6SOded Gabbay { 21519f6d2a6SOded Gabbay if (db) { 21619f6d2a6SOded Gabbay writel(value, db); 2178f8fb9b9SKent Russell pr_debug("Writing %d to doorbell address %p\n", value, db); 21819f6d2a6SOded Gabbay } 21919f6d2a6SOded Gabbay } 22019f6d2a6SOded Gabbay 22119f6d2a6SOded Gabbay /* 22219f6d2a6SOded Gabbay * queue_ids are in the range [0,MAX_PROCESS_QUEUES) and are mapped 1:1 22319f6d2a6SOded Gabbay * to doorbells with the process's doorbell page 22419f6d2a6SOded Gabbay */ 22519f6d2a6SOded Gabbay unsigned int kfd_queue_id_to_doorbell(struct kfd_dev *kfd, 22619f6d2a6SOded Gabbay struct kfd_process *process, 22719f6d2a6SOded Gabbay unsigned int queue_id) 22819f6d2a6SOded Gabbay { 22919f6d2a6SOded Gabbay /* 23019f6d2a6SOded Gabbay * doorbell_id_offset accounts for doorbells taken by KGD. 231a91e70e3SFelix Kuehling * index * doorbell_process_allocation/sizeof(u32) adjusts to 232a91e70e3SFelix Kuehling * the process's doorbells. 23319f6d2a6SOded Gabbay */ 23419f6d2a6SOded Gabbay return kfd->doorbell_id_offset + 235a91e70e3SFelix Kuehling process->doorbell_index 236a91e70e3SFelix Kuehling * doorbell_process_allocation() / sizeof(u32) + 23719f6d2a6SOded Gabbay queue_id; 23819f6d2a6SOded Gabbay } 23919f6d2a6SOded Gabbay 24019f6d2a6SOded Gabbay uint64_t kfd_get_number_elems(struct kfd_dev *kfd) 24119f6d2a6SOded Gabbay { 24219f6d2a6SOded Gabbay uint64_t num_of_elems = (kfd->shared_resources.doorbell_aperture_size - 24319f6d2a6SOded Gabbay kfd->shared_resources.doorbell_start_offset) / 24419f6d2a6SOded Gabbay doorbell_process_allocation() + 1; 24519f6d2a6SOded Gabbay 24619f6d2a6SOded Gabbay return num_of_elems; 24719f6d2a6SOded Gabbay 24819f6d2a6SOded Gabbay } 24919f6d2a6SOded Gabbay 25019f6d2a6SOded Gabbay phys_addr_t kfd_get_process_doorbells(struct kfd_dev *dev, 25119f6d2a6SOded Gabbay struct kfd_process *process) 25219f6d2a6SOded Gabbay { 25319f6d2a6SOded Gabbay return dev->doorbell_base + 254a91e70e3SFelix Kuehling process->doorbell_index * doorbell_process_allocation(); 255a91e70e3SFelix Kuehling } 256a91e70e3SFelix Kuehling 257a91e70e3SFelix Kuehling int kfd_alloc_process_doorbells(struct kfd_process *process) 258a91e70e3SFelix Kuehling { 259a91e70e3SFelix Kuehling int r = ida_simple_get(&doorbell_ida, 1, max_doorbell_slices, 260a91e70e3SFelix Kuehling GFP_KERNEL); 261a91e70e3SFelix Kuehling if (r > 0) 262a91e70e3SFelix Kuehling process->doorbell_index = r; 263a91e70e3SFelix Kuehling 264a91e70e3SFelix Kuehling return r; 265a91e70e3SFelix Kuehling } 266a91e70e3SFelix Kuehling 267a91e70e3SFelix Kuehling void kfd_free_process_doorbells(struct kfd_process *process) 268a91e70e3SFelix Kuehling { 269a91e70e3SFelix Kuehling if (process->doorbell_index) 270a91e70e3SFelix Kuehling ida_simple_remove(&doorbell_ida, process->doorbell_index); 27119f6d2a6SOded Gabbay } 272