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 3419f6d2a6SOded Gabbay /* 3519f6d2a6SOded Gabbay * Each device exposes a doorbell aperture, a PCI MMIO aperture that 3619f6d2a6SOded Gabbay * receives 32-bit writes that are passed to queues as wptr values. 3719f6d2a6SOded Gabbay * The doorbells are intended to be written by applications as part 3819f6d2a6SOded Gabbay * of queueing work on user-mode queues. 3919f6d2a6SOded Gabbay * We assign doorbells to applications in PAGE_SIZE-sized and aligned chunks. 4019f6d2a6SOded Gabbay * We map the doorbell address space into user-mode when a process creates 4119f6d2a6SOded Gabbay * its first queue on each device. 4219f6d2a6SOded Gabbay * Although the mapping is done by KFD, it is equivalent to an mmap of 4319f6d2a6SOded Gabbay * the /dev/kfd with the particular device encoded in the mmap offset. 4419f6d2a6SOded Gabbay * There will be other uses for mmap of /dev/kfd, so only a range of 4519f6d2a6SOded Gabbay * offsets (KFD_MMAP_DOORBELL_START-END) is used for doorbells. 4619f6d2a6SOded Gabbay */ 4719f6d2a6SOded Gabbay 4819f6d2a6SOded Gabbay /* # of doorbell bytes allocated for each process. */ 49ef568db7SFelix Kuehling size_t kfd_doorbell_process_slice(struct kfd_dev *kfd) 5019f6d2a6SOded Gabbay { 51*f0dc99a6SGraham Sider return roundup(kfd->device_info.doorbell_size * 5219f6d2a6SOded Gabbay KFD_MAX_NUM_OF_QUEUES_PER_PROCESS, 5319f6d2a6SOded Gabbay PAGE_SIZE); 5419f6d2a6SOded Gabbay } 5519f6d2a6SOded Gabbay 5619f6d2a6SOded Gabbay /* Doorbell calculations for device init. */ 57735df2baSFelix Kuehling int kfd_doorbell_init(struct kfd_dev *kfd) 5819f6d2a6SOded Gabbay { 5919f6d2a6SOded Gabbay size_t doorbell_start_offset; 6019f6d2a6SOded Gabbay size_t doorbell_aperture_size; 6119f6d2a6SOded Gabbay size_t doorbell_process_limit; 6219f6d2a6SOded Gabbay 6319f6d2a6SOded Gabbay /* 6419f6d2a6SOded Gabbay * We start with calculations in bytes because the input data might 6519f6d2a6SOded Gabbay * only be byte-aligned. 6619f6d2a6SOded Gabbay * Only after we have done the rounding can we assume any alignment. 6719f6d2a6SOded Gabbay */ 6819f6d2a6SOded Gabbay 6919f6d2a6SOded Gabbay doorbell_start_offset = 7019f6d2a6SOded Gabbay roundup(kfd->shared_resources.doorbell_start_offset, 71ada2b29cSFelix Kuehling kfd_doorbell_process_slice(kfd)); 7219f6d2a6SOded Gabbay 7319f6d2a6SOded Gabbay doorbell_aperture_size = 7419f6d2a6SOded Gabbay rounddown(kfd->shared_resources.doorbell_aperture_size, 75ada2b29cSFelix Kuehling kfd_doorbell_process_slice(kfd)); 7619f6d2a6SOded Gabbay 7719f6d2a6SOded Gabbay if (doorbell_aperture_size > doorbell_start_offset) 7819f6d2a6SOded Gabbay doorbell_process_limit = 7919f6d2a6SOded Gabbay (doorbell_aperture_size - doorbell_start_offset) / 80ada2b29cSFelix Kuehling kfd_doorbell_process_slice(kfd); 8119f6d2a6SOded Gabbay else 82a91e70e3SFelix Kuehling return -ENOSPC; 83a91e70e3SFelix Kuehling 8459d7115dSMukul Joshi if (!kfd->max_doorbell_slices || 8559d7115dSMukul Joshi doorbell_process_limit < kfd->max_doorbell_slices) 8659d7115dSMukul Joshi kfd->max_doorbell_slices = doorbell_process_limit; 8719f6d2a6SOded Gabbay 8819f6d2a6SOded Gabbay kfd->doorbell_base = kfd->shared_resources.doorbell_physical_address + 8919f6d2a6SOded Gabbay doorbell_start_offset; 9019f6d2a6SOded Gabbay 91339903faSYong Zhao kfd->doorbell_base_dw_offset = doorbell_start_offset / sizeof(u32); 9219f6d2a6SOded Gabbay 9319f6d2a6SOded Gabbay kfd->doorbell_kernel_ptr = ioremap(kfd->doorbell_base, 94ada2b29cSFelix Kuehling kfd_doorbell_process_slice(kfd)); 9519f6d2a6SOded Gabbay 96735df2baSFelix Kuehling if (!kfd->doorbell_kernel_ptr) 97735df2baSFelix Kuehling return -ENOMEM; 9819f6d2a6SOded Gabbay 9979775b62SKent Russell pr_debug("Doorbell initialization:\n"); 10079775b62SKent Russell pr_debug("doorbell base == 0x%08lX\n", 10119f6d2a6SOded Gabbay (uintptr_t)kfd->doorbell_base); 10219f6d2a6SOded Gabbay 103339903faSYong Zhao pr_debug("doorbell_base_dw_offset == 0x%08lX\n", 104339903faSYong Zhao kfd->doorbell_base_dw_offset); 10519f6d2a6SOded Gabbay 10679775b62SKent Russell pr_debug("doorbell_process_limit == 0x%08lX\n", 10719f6d2a6SOded Gabbay doorbell_process_limit); 10819f6d2a6SOded Gabbay 10979775b62SKent Russell pr_debug("doorbell_kernel_offset == 0x%08lX\n", 11019f6d2a6SOded Gabbay (uintptr_t)kfd->doorbell_base); 11119f6d2a6SOded Gabbay 11279775b62SKent Russell pr_debug("doorbell aperture size == 0x%08lX\n", 11319f6d2a6SOded Gabbay kfd->shared_resources.doorbell_aperture_size); 11419f6d2a6SOded Gabbay 1158f8fb9b9SKent Russell pr_debug("doorbell kernel address == %p\n", kfd->doorbell_kernel_ptr); 116735df2baSFelix Kuehling 117735df2baSFelix Kuehling return 0; 118735df2baSFelix Kuehling } 119735df2baSFelix Kuehling 120735df2baSFelix Kuehling void kfd_doorbell_fini(struct kfd_dev *kfd) 121735df2baSFelix Kuehling { 122735df2baSFelix Kuehling if (kfd->doorbell_kernel_ptr) 123735df2baSFelix Kuehling iounmap(kfd->doorbell_kernel_ptr); 12419f6d2a6SOded Gabbay } 12519f6d2a6SOded Gabbay 126df03ef93SHarish Kasiviswanathan int kfd_doorbell_mmap(struct kfd_dev *dev, struct kfd_process *process, 127df03ef93SHarish Kasiviswanathan struct vm_area_struct *vma) 12819f6d2a6SOded Gabbay { 12919f6d2a6SOded Gabbay phys_addr_t address; 13059d7115dSMukul Joshi struct kfd_process_device *pdd; 131ada2b29cSFelix Kuehling 13219f6d2a6SOded Gabbay /* 13319f6d2a6SOded Gabbay * For simplicitly we only allow mapping of the entire doorbell 13419f6d2a6SOded Gabbay * allocation of a single device & process. 13519f6d2a6SOded Gabbay */ 136ada2b29cSFelix Kuehling if (vma->vm_end - vma->vm_start != kfd_doorbell_process_slice(dev)) 13719f6d2a6SOded Gabbay return -EINVAL; 13819f6d2a6SOded Gabbay 13959d7115dSMukul Joshi pdd = kfd_get_process_device_data(dev, process); 14059d7115dSMukul Joshi if (!pdd) 14159d7115dSMukul Joshi return -EINVAL; 14219f6d2a6SOded Gabbay 14359d7115dSMukul Joshi /* Calculate physical address of doorbell */ 14459d7115dSMukul Joshi address = kfd_get_process_doorbells(pdd); 14519f6d2a6SOded Gabbay vma->vm_flags |= VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_NORESERVE | 14619f6d2a6SOded Gabbay VM_DONTDUMP | VM_PFNMAP; 14719f6d2a6SOded Gabbay 14819f6d2a6SOded Gabbay vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 14919f6d2a6SOded Gabbay 15079775b62SKent Russell pr_debug("Mapping doorbell page\n" 1516f4d92a1SEdward O'Callaghan " target user address == 0x%08llX\n" 1526f4d92a1SEdward O'Callaghan " physical address == 0x%08llX\n" 1536f4d92a1SEdward O'Callaghan " vm_flags == 0x%04lX\n" 1546f4d92a1SEdward O'Callaghan " size == 0x%04lX\n", 1556f4d92a1SEdward O'Callaghan (unsigned long long) vma->vm_start, address, vma->vm_flags, 156ada2b29cSFelix Kuehling kfd_doorbell_process_slice(dev)); 15719f6d2a6SOded Gabbay 1586f4d92a1SEdward O'Callaghan 15919f6d2a6SOded Gabbay return io_remap_pfn_range(vma, 16019f6d2a6SOded Gabbay vma->vm_start, 16119f6d2a6SOded Gabbay address >> PAGE_SHIFT, 162ada2b29cSFelix Kuehling kfd_doorbell_process_slice(dev), 16319f6d2a6SOded Gabbay vma->vm_page_prot); 16419f6d2a6SOded Gabbay } 16519f6d2a6SOded Gabbay 16619f6d2a6SOded Gabbay 16719f6d2a6SOded Gabbay /* get kernel iomem pointer for a doorbell */ 168ada2b29cSFelix Kuehling void __iomem *kfd_get_kernel_doorbell(struct kfd_dev *kfd, 16919f6d2a6SOded Gabbay unsigned int *doorbell_off) 17019f6d2a6SOded Gabbay { 17119f6d2a6SOded Gabbay u32 inx; 17219f6d2a6SOded Gabbay 173cea405b1SXihan Zhang mutex_lock(&kfd->doorbell_mutex); 174cea405b1SXihan Zhang inx = find_first_zero_bit(kfd->doorbell_available_index, 17519f6d2a6SOded Gabbay KFD_MAX_NUM_OF_QUEUES_PER_PROCESS); 17619f6d2a6SOded Gabbay 177cea405b1SXihan Zhang __set_bit(inx, kfd->doorbell_available_index); 178cea405b1SXihan Zhang mutex_unlock(&kfd->doorbell_mutex); 17919f6d2a6SOded Gabbay 18019f6d2a6SOded Gabbay if (inx >= KFD_MAX_NUM_OF_QUEUES_PER_PROCESS) 18119f6d2a6SOded Gabbay return NULL; 18219f6d2a6SOded Gabbay 183*f0dc99a6SGraham Sider inx *= kfd->device_info.doorbell_size / sizeof(u32); 184ada2b29cSFelix Kuehling 18519f6d2a6SOded Gabbay /* 186a91e70e3SFelix Kuehling * Calculating the kernel doorbell offset using the first 187a91e70e3SFelix Kuehling * doorbell page. 18819f6d2a6SOded Gabbay */ 189339903faSYong Zhao *doorbell_off = kfd->doorbell_base_dw_offset + inx; 19019f6d2a6SOded Gabbay 19179775b62SKent Russell pr_debug("Get kernel queue doorbell\n" 1926dae6162SColin Ian King " doorbell offset == 0x%08X\n" 193951df6d9SShaoyun Liu " doorbell index == 0x%x\n", 194951df6d9SShaoyun Liu *doorbell_off, inx); 19519f6d2a6SOded Gabbay 19619f6d2a6SOded Gabbay return kfd->doorbell_kernel_ptr + inx; 19719f6d2a6SOded Gabbay } 19819f6d2a6SOded Gabbay 19919f6d2a6SOded Gabbay void kfd_release_kernel_doorbell(struct kfd_dev *kfd, u32 __iomem *db_addr) 20019f6d2a6SOded Gabbay { 20119f6d2a6SOded Gabbay unsigned int inx; 20219f6d2a6SOded Gabbay 203951df6d9SShaoyun Liu inx = (unsigned int)(db_addr - kfd->doorbell_kernel_ptr) 204*f0dc99a6SGraham Sider * sizeof(u32) / kfd->device_info.doorbell_size; 20519f6d2a6SOded Gabbay 206cea405b1SXihan Zhang mutex_lock(&kfd->doorbell_mutex); 207cea405b1SXihan Zhang __clear_bit(inx, kfd->doorbell_available_index); 208cea405b1SXihan Zhang mutex_unlock(&kfd->doorbell_mutex); 20919f6d2a6SOded Gabbay } 21019f6d2a6SOded Gabbay 211ada2b29cSFelix Kuehling void write_kernel_doorbell(void __iomem *db, u32 value) 21219f6d2a6SOded Gabbay { 21319f6d2a6SOded Gabbay if (db) { 21419f6d2a6SOded Gabbay writel(value, db); 2158f8fb9b9SKent Russell pr_debug("Writing %d to doorbell address %p\n", value, db); 21619f6d2a6SOded Gabbay } 21719f6d2a6SOded Gabbay } 21819f6d2a6SOded Gabbay 2199d7d0248SFelix Kuehling void write_kernel_doorbell64(void __iomem *db, u64 value) 2209d7d0248SFelix Kuehling { 2219d7d0248SFelix Kuehling if (db) { 2229d7d0248SFelix Kuehling WARN(((unsigned long)db & 7) != 0, 2239d7d0248SFelix Kuehling "Unaligned 64-bit doorbell"); 2249d7d0248SFelix Kuehling writeq(value, (u64 __iomem *)db); 2259d7d0248SFelix Kuehling pr_debug("writing %llu to doorbell address %p\n", value, db); 2269d7d0248SFelix Kuehling } 2279d7d0248SFelix Kuehling } 2289d7d0248SFelix Kuehling 229339903faSYong Zhao unsigned int kfd_get_doorbell_dw_offset_in_bar(struct kfd_dev *kfd, 23059d7115dSMukul Joshi struct kfd_process_device *pdd, 231ef568db7SFelix Kuehling unsigned int doorbell_id) 23219f6d2a6SOded Gabbay { 23319f6d2a6SOded Gabbay /* 234339903faSYong Zhao * doorbell_base_dw_offset accounts for doorbells taken by KGD. 235ada2b29cSFelix Kuehling * index * kfd_doorbell_process_slice/sizeof(u32) adjusts to 236ada2b29cSFelix Kuehling * the process's doorbells. The offset returned is in dword 237ada2b29cSFelix Kuehling * units regardless of the ASIC-dependent doorbell size. 23819f6d2a6SOded Gabbay */ 239339903faSYong Zhao return kfd->doorbell_base_dw_offset + 24059d7115dSMukul Joshi pdd->doorbell_index 241ada2b29cSFelix Kuehling * kfd_doorbell_process_slice(kfd) / sizeof(u32) + 242*f0dc99a6SGraham Sider doorbell_id * kfd->device_info.doorbell_size / sizeof(u32); 24319f6d2a6SOded Gabbay } 24419f6d2a6SOded Gabbay 24519f6d2a6SOded Gabbay uint64_t kfd_get_number_elems(struct kfd_dev *kfd) 24619f6d2a6SOded Gabbay { 24719f6d2a6SOded Gabbay uint64_t num_of_elems = (kfd->shared_resources.doorbell_aperture_size - 24819f6d2a6SOded Gabbay kfd->shared_resources.doorbell_start_offset) / 249ada2b29cSFelix Kuehling kfd_doorbell_process_slice(kfd) + 1; 25019f6d2a6SOded Gabbay 25119f6d2a6SOded Gabbay return num_of_elems; 25219f6d2a6SOded Gabbay 25319f6d2a6SOded Gabbay } 25419f6d2a6SOded Gabbay 25559d7115dSMukul Joshi phys_addr_t kfd_get_process_doorbells(struct kfd_process_device *pdd) 25619f6d2a6SOded Gabbay { 25759d7115dSMukul Joshi return pdd->dev->doorbell_base + 25859d7115dSMukul Joshi pdd->doorbell_index * kfd_doorbell_process_slice(pdd->dev); 259a91e70e3SFelix Kuehling } 260a91e70e3SFelix Kuehling 26159d7115dSMukul Joshi int kfd_alloc_process_doorbells(struct kfd_dev *kfd, unsigned int *doorbell_index) 262a91e70e3SFelix Kuehling { 26359d7115dSMukul Joshi int r = ida_simple_get(&kfd->doorbell_ida, 1, kfd->max_doorbell_slices, 264a91e70e3SFelix Kuehling GFP_KERNEL); 265a91e70e3SFelix Kuehling if (r > 0) 26659d7115dSMukul Joshi *doorbell_index = r; 267a91e70e3SFelix Kuehling 268a91e70e3SFelix Kuehling return r; 269a91e70e3SFelix Kuehling } 270a91e70e3SFelix Kuehling 27159d7115dSMukul Joshi void kfd_free_process_doorbells(struct kfd_dev *kfd, unsigned int doorbell_index) 272a91e70e3SFelix Kuehling { 27359d7115dSMukul Joshi if (doorbell_index) 27459d7115dSMukul Joshi ida_simple_remove(&kfd->doorbell_ida, doorbell_index); 27519f6d2a6SOded Gabbay } 276