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 3719f6d2a6SOded Gabbay /* 3819f6d2a6SOded Gabbay * Each device exposes a doorbell aperture, a PCI MMIO aperture that 3919f6d2a6SOded Gabbay * receives 32-bit writes that are passed to queues as wptr values. 4019f6d2a6SOded Gabbay * The doorbells are intended to be written by applications as part 4119f6d2a6SOded Gabbay * of queueing work on user-mode queues. 4219f6d2a6SOded Gabbay * We assign doorbells to applications in PAGE_SIZE-sized and aligned chunks. 4319f6d2a6SOded Gabbay * We map the doorbell address space into user-mode when a process creates 4419f6d2a6SOded Gabbay * its first queue on each device. 4519f6d2a6SOded Gabbay * Although the mapping is done by KFD, it is equivalent to an mmap of 4619f6d2a6SOded Gabbay * the /dev/kfd with the particular device encoded in the mmap offset. 4719f6d2a6SOded Gabbay * There will be other uses for mmap of /dev/kfd, so only a range of 4819f6d2a6SOded Gabbay * offsets (KFD_MMAP_DOORBELL_START-END) is used for doorbells. 4919f6d2a6SOded Gabbay */ 5019f6d2a6SOded Gabbay 5119f6d2a6SOded Gabbay /* # of doorbell bytes allocated for each process. */ 52ef568db7SFelix Kuehling size_t kfd_doorbell_process_slice(struct kfd_dev *kfd) 5319f6d2a6SOded Gabbay { 54ada2b29cSFelix Kuehling return roundup(kfd->device_info->doorbell_size * 5519f6d2a6SOded Gabbay KFD_MAX_NUM_OF_QUEUES_PER_PROCESS, 5619f6d2a6SOded Gabbay PAGE_SIZE); 5719f6d2a6SOded Gabbay } 5819f6d2a6SOded Gabbay 5919f6d2a6SOded Gabbay /* Doorbell calculations for device init. */ 60735df2baSFelix Kuehling int kfd_doorbell_init(struct kfd_dev *kfd) 6119f6d2a6SOded Gabbay { 6219f6d2a6SOded Gabbay size_t doorbell_start_offset; 6319f6d2a6SOded Gabbay size_t doorbell_aperture_size; 6419f6d2a6SOded Gabbay size_t doorbell_process_limit; 6519f6d2a6SOded Gabbay 6619f6d2a6SOded Gabbay /* 6719f6d2a6SOded Gabbay * We start with calculations in bytes because the input data might 6819f6d2a6SOded Gabbay * only be byte-aligned. 6919f6d2a6SOded Gabbay * Only after we have done the rounding can we assume any alignment. 7019f6d2a6SOded Gabbay */ 7119f6d2a6SOded Gabbay 7219f6d2a6SOded Gabbay doorbell_start_offset = 7319f6d2a6SOded Gabbay roundup(kfd->shared_resources.doorbell_start_offset, 74ada2b29cSFelix Kuehling kfd_doorbell_process_slice(kfd)); 7519f6d2a6SOded Gabbay 7619f6d2a6SOded Gabbay doorbell_aperture_size = 7719f6d2a6SOded Gabbay rounddown(kfd->shared_resources.doorbell_aperture_size, 78ada2b29cSFelix Kuehling kfd_doorbell_process_slice(kfd)); 7919f6d2a6SOded Gabbay 8019f6d2a6SOded Gabbay if (doorbell_aperture_size > doorbell_start_offset) 8119f6d2a6SOded Gabbay doorbell_process_limit = 8219f6d2a6SOded Gabbay (doorbell_aperture_size - doorbell_start_offset) / 83ada2b29cSFelix Kuehling kfd_doorbell_process_slice(kfd); 8419f6d2a6SOded Gabbay else 85a91e70e3SFelix Kuehling return -ENOSPC; 86a91e70e3SFelix Kuehling 87a91e70e3SFelix Kuehling if (!max_doorbell_slices || 88a91e70e3SFelix Kuehling doorbell_process_limit < max_doorbell_slices) 89a91e70e3SFelix Kuehling max_doorbell_slices = doorbell_process_limit; 9019f6d2a6SOded Gabbay 9119f6d2a6SOded Gabbay kfd->doorbell_base = kfd->shared_resources.doorbell_physical_address + 9219f6d2a6SOded Gabbay doorbell_start_offset; 9319f6d2a6SOded Gabbay 9419f6d2a6SOded Gabbay kfd->doorbell_id_offset = doorbell_start_offset / sizeof(u32); 9519f6d2a6SOded Gabbay 9619f6d2a6SOded Gabbay kfd->doorbell_kernel_ptr = ioremap(kfd->doorbell_base, 97ada2b29cSFelix Kuehling kfd_doorbell_process_slice(kfd)); 9819f6d2a6SOded Gabbay 99735df2baSFelix Kuehling if (!kfd->doorbell_kernel_ptr) 100735df2baSFelix Kuehling return -ENOMEM; 10119f6d2a6SOded Gabbay 10279775b62SKent Russell pr_debug("Doorbell initialization:\n"); 10379775b62SKent Russell pr_debug("doorbell base == 0x%08lX\n", 10419f6d2a6SOded Gabbay (uintptr_t)kfd->doorbell_base); 10519f6d2a6SOded Gabbay 10679775b62SKent Russell pr_debug("doorbell_id_offset == 0x%08lX\n", 10719f6d2a6SOded Gabbay kfd->doorbell_id_offset); 10819f6d2a6SOded Gabbay 10979775b62SKent Russell pr_debug("doorbell_process_limit == 0x%08lX\n", 11019f6d2a6SOded Gabbay doorbell_process_limit); 11119f6d2a6SOded Gabbay 11279775b62SKent Russell pr_debug("doorbell_kernel_offset == 0x%08lX\n", 11319f6d2a6SOded Gabbay (uintptr_t)kfd->doorbell_base); 11419f6d2a6SOded Gabbay 11579775b62SKent Russell pr_debug("doorbell aperture size == 0x%08lX\n", 11619f6d2a6SOded Gabbay kfd->shared_resources.doorbell_aperture_size); 11719f6d2a6SOded Gabbay 1188f8fb9b9SKent Russell pr_debug("doorbell kernel address == %p\n", kfd->doorbell_kernel_ptr); 119735df2baSFelix Kuehling 120735df2baSFelix Kuehling return 0; 121735df2baSFelix Kuehling } 122735df2baSFelix Kuehling 123735df2baSFelix Kuehling void kfd_doorbell_fini(struct kfd_dev *kfd) 124735df2baSFelix Kuehling { 125735df2baSFelix Kuehling if (kfd->doorbell_kernel_ptr) 126735df2baSFelix Kuehling iounmap(kfd->doorbell_kernel_ptr); 12719f6d2a6SOded Gabbay } 12819f6d2a6SOded Gabbay 129df03ef93SHarish Kasiviswanathan int kfd_doorbell_mmap(struct kfd_dev *dev, struct kfd_process *process, 130df03ef93SHarish Kasiviswanathan struct vm_area_struct *vma) 13119f6d2a6SOded Gabbay { 13219f6d2a6SOded Gabbay phys_addr_t address; 133ada2b29cSFelix Kuehling 13419f6d2a6SOded Gabbay /* 13519f6d2a6SOded Gabbay * For simplicitly we only allow mapping of the entire doorbell 13619f6d2a6SOded Gabbay * allocation of a single device & process. 13719f6d2a6SOded Gabbay */ 138ada2b29cSFelix Kuehling if (vma->vm_end - vma->vm_start != kfd_doorbell_process_slice(dev)) 13919f6d2a6SOded Gabbay return -EINVAL; 14019f6d2a6SOded Gabbay 14119f6d2a6SOded Gabbay /* Calculate physical address of doorbell */ 14219f6d2a6SOded Gabbay address = kfd_get_process_doorbells(dev, process); 14319f6d2a6SOded Gabbay 14419f6d2a6SOded Gabbay vma->vm_flags |= VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_NORESERVE | 14519f6d2a6SOded Gabbay VM_DONTDUMP | VM_PFNMAP; 14619f6d2a6SOded Gabbay 14719f6d2a6SOded Gabbay vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 14819f6d2a6SOded Gabbay 14979775b62SKent Russell pr_debug("Mapping doorbell page\n" 1506f4d92a1SEdward O'Callaghan " target user address == 0x%08llX\n" 1516f4d92a1SEdward O'Callaghan " physical address == 0x%08llX\n" 1526f4d92a1SEdward O'Callaghan " vm_flags == 0x%04lX\n" 1536f4d92a1SEdward O'Callaghan " size == 0x%04lX\n", 1546f4d92a1SEdward O'Callaghan (unsigned long long) vma->vm_start, address, vma->vm_flags, 155ada2b29cSFelix Kuehling kfd_doorbell_process_slice(dev)); 15619f6d2a6SOded Gabbay 1576f4d92a1SEdward O'Callaghan 15819f6d2a6SOded Gabbay return io_remap_pfn_range(vma, 15919f6d2a6SOded Gabbay vma->vm_start, 16019f6d2a6SOded Gabbay address >> PAGE_SHIFT, 161ada2b29cSFelix Kuehling kfd_doorbell_process_slice(dev), 16219f6d2a6SOded Gabbay vma->vm_page_prot); 16319f6d2a6SOded Gabbay } 16419f6d2a6SOded Gabbay 16519f6d2a6SOded Gabbay 16619f6d2a6SOded Gabbay /* get kernel iomem pointer for a doorbell */ 167ada2b29cSFelix Kuehling void __iomem *kfd_get_kernel_doorbell(struct kfd_dev *kfd, 16819f6d2a6SOded Gabbay unsigned int *doorbell_off) 16919f6d2a6SOded Gabbay { 17019f6d2a6SOded Gabbay u32 inx; 17119f6d2a6SOded Gabbay 172cea405b1SXihan Zhang mutex_lock(&kfd->doorbell_mutex); 173cea405b1SXihan Zhang inx = find_first_zero_bit(kfd->doorbell_available_index, 17419f6d2a6SOded Gabbay KFD_MAX_NUM_OF_QUEUES_PER_PROCESS); 17519f6d2a6SOded Gabbay 176cea405b1SXihan Zhang __set_bit(inx, kfd->doorbell_available_index); 177cea405b1SXihan Zhang mutex_unlock(&kfd->doorbell_mutex); 17819f6d2a6SOded Gabbay 17919f6d2a6SOded Gabbay if (inx >= KFD_MAX_NUM_OF_QUEUES_PER_PROCESS) 18019f6d2a6SOded Gabbay return NULL; 18119f6d2a6SOded Gabbay 182ada2b29cSFelix Kuehling inx *= kfd->device_info->doorbell_size / sizeof(u32); 183ada2b29cSFelix Kuehling 18419f6d2a6SOded Gabbay /* 185a91e70e3SFelix Kuehling * Calculating the kernel doorbell offset using the first 186a91e70e3SFelix Kuehling * doorbell page. 18719f6d2a6SOded Gabbay */ 188a91e70e3SFelix Kuehling *doorbell_off = kfd->doorbell_id_offset + inx; 18919f6d2a6SOded Gabbay 19079775b62SKent Russell pr_debug("Get kernel queue doorbell\n" 1916dae6162SColin Ian King " doorbell offset == 0x%08X\n" 1928f8fb9b9SKent Russell " kernel address == %p\n", 1938f8fb9b9SKent Russell *doorbell_off, (kfd->doorbell_kernel_ptr + inx)); 19419f6d2a6SOded Gabbay 19519f6d2a6SOded Gabbay return kfd->doorbell_kernel_ptr + inx; 19619f6d2a6SOded Gabbay } 19719f6d2a6SOded Gabbay 19819f6d2a6SOded Gabbay void kfd_release_kernel_doorbell(struct kfd_dev *kfd, u32 __iomem *db_addr) 19919f6d2a6SOded Gabbay { 20019f6d2a6SOded Gabbay unsigned int inx; 20119f6d2a6SOded Gabbay 20219f6d2a6SOded Gabbay inx = (unsigned int)(db_addr - kfd->doorbell_kernel_ptr); 20319f6d2a6SOded Gabbay 204cea405b1SXihan Zhang mutex_lock(&kfd->doorbell_mutex); 205cea405b1SXihan Zhang __clear_bit(inx, kfd->doorbell_available_index); 206cea405b1SXihan Zhang mutex_unlock(&kfd->doorbell_mutex); 20719f6d2a6SOded Gabbay } 20819f6d2a6SOded Gabbay 209ada2b29cSFelix Kuehling void write_kernel_doorbell(void __iomem *db, u32 value) 21019f6d2a6SOded Gabbay { 21119f6d2a6SOded Gabbay if (db) { 21219f6d2a6SOded Gabbay writel(value, db); 2138f8fb9b9SKent Russell pr_debug("Writing %d to doorbell address %p\n", value, db); 21419f6d2a6SOded Gabbay } 21519f6d2a6SOded Gabbay } 21619f6d2a6SOded Gabbay 2179d7d0248SFelix Kuehling void write_kernel_doorbell64(void __iomem *db, u64 value) 2189d7d0248SFelix Kuehling { 2199d7d0248SFelix Kuehling if (db) { 2209d7d0248SFelix Kuehling WARN(((unsigned long)db & 7) != 0, 2219d7d0248SFelix Kuehling "Unaligned 64-bit doorbell"); 2229d7d0248SFelix Kuehling writeq(value, (u64 __iomem *)db); 2239d7d0248SFelix Kuehling pr_debug("writing %llu to doorbell address %p\n", value, db); 2249d7d0248SFelix Kuehling } 2259d7d0248SFelix Kuehling } 2269d7d0248SFelix Kuehling 227ef568db7SFelix Kuehling unsigned int kfd_doorbell_id_to_offset(struct kfd_dev *kfd, 22819f6d2a6SOded Gabbay struct kfd_process *process, 229ef568db7SFelix Kuehling unsigned int doorbell_id) 23019f6d2a6SOded Gabbay { 23119f6d2a6SOded Gabbay /* 23219f6d2a6SOded Gabbay * doorbell_id_offset accounts for doorbells taken by KGD. 233ada2b29cSFelix Kuehling * index * kfd_doorbell_process_slice/sizeof(u32) adjusts to 234ada2b29cSFelix Kuehling * the process's doorbells. The offset returned is in dword 235ada2b29cSFelix Kuehling * units regardless of the ASIC-dependent doorbell size. 23619f6d2a6SOded Gabbay */ 23719f6d2a6SOded Gabbay return kfd->doorbell_id_offset + 238a91e70e3SFelix Kuehling process->doorbell_index 239ada2b29cSFelix Kuehling * kfd_doorbell_process_slice(kfd) / sizeof(u32) + 240ef568db7SFelix Kuehling doorbell_id * kfd->device_info->doorbell_size / sizeof(u32); 24119f6d2a6SOded Gabbay } 24219f6d2a6SOded Gabbay 24319f6d2a6SOded Gabbay uint64_t kfd_get_number_elems(struct kfd_dev *kfd) 24419f6d2a6SOded Gabbay { 24519f6d2a6SOded Gabbay uint64_t num_of_elems = (kfd->shared_resources.doorbell_aperture_size - 24619f6d2a6SOded Gabbay kfd->shared_resources.doorbell_start_offset) / 247ada2b29cSFelix Kuehling kfd_doorbell_process_slice(kfd) + 1; 24819f6d2a6SOded Gabbay 24919f6d2a6SOded Gabbay return num_of_elems; 25019f6d2a6SOded Gabbay 25119f6d2a6SOded Gabbay } 25219f6d2a6SOded Gabbay 25319f6d2a6SOded Gabbay phys_addr_t kfd_get_process_doorbells(struct kfd_dev *dev, 25419f6d2a6SOded Gabbay struct kfd_process *process) 25519f6d2a6SOded Gabbay { 25619f6d2a6SOded Gabbay return dev->doorbell_base + 257ada2b29cSFelix Kuehling process->doorbell_index * kfd_doorbell_process_slice(dev); 258a91e70e3SFelix Kuehling } 259a91e70e3SFelix Kuehling 260a91e70e3SFelix Kuehling int kfd_alloc_process_doorbells(struct kfd_process *process) 261a91e70e3SFelix Kuehling { 262a91e70e3SFelix Kuehling int r = ida_simple_get(&doorbell_ida, 1, max_doorbell_slices, 263a91e70e3SFelix Kuehling GFP_KERNEL); 264a91e70e3SFelix Kuehling if (r > 0) 265a91e70e3SFelix Kuehling process->doorbell_index = r; 266a91e70e3SFelix Kuehling 267a91e70e3SFelix Kuehling return r; 268a91e70e3SFelix Kuehling } 269a91e70e3SFelix Kuehling 270a91e70e3SFelix Kuehling void kfd_free_process_doorbells(struct kfd_process *process) 271a91e70e3SFelix Kuehling { 272a91e70e3SFelix Kuehling if (process->doorbell_index) 273a91e70e3SFelix Kuehling ida_simple_remove(&doorbell_ida, process->doorbell_index); 27419f6d2a6SOded Gabbay } 275