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> 2619f6d2a6SOded Gabbay 2719f6d2a6SOded Gabbay /* 2819f6d2a6SOded Gabbay * This extension supports a kernel level doorbells management for 2919f6d2a6SOded Gabbay * the kernel queues. 3019f6d2a6SOded Gabbay * Basically the last doorbells page is devoted to kernel queues 3119f6d2a6SOded Gabbay * and that's assures that any user process won't get access to the 3219f6d2a6SOded Gabbay * kernel doorbells page 3319f6d2a6SOded Gabbay */ 3419f6d2a6SOded Gabbay static DEFINE_MUTEX(doorbell_mutex); 3519f6d2a6SOded Gabbay static unsigned long doorbell_available_index[ 3619f6d2a6SOded Gabbay DIV_ROUND_UP(KFD_MAX_NUM_OF_QUEUES_PER_PROCESS, BITS_PER_LONG)] = { 0 }; 3719f6d2a6SOded Gabbay 3819f6d2a6SOded Gabbay #define KERNEL_DOORBELL_PASID 1 3919f6d2a6SOded Gabbay #define KFD_SIZE_OF_DOORBELL_IN_BYTES 4 4019f6d2a6SOded Gabbay 4119f6d2a6SOded Gabbay /* 4219f6d2a6SOded Gabbay * Each device exposes a doorbell aperture, a PCI MMIO aperture that 4319f6d2a6SOded Gabbay * receives 32-bit writes that are passed to queues as wptr values. 4419f6d2a6SOded Gabbay * The doorbells are intended to be written by applications as part 4519f6d2a6SOded Gabbay * of queueing work on user-mode queues. 4619f6d2a6SOded Gabbay * We assign doorbells to applications in PAGE_SIZE-sized and aligned chunks. 4719f6d2a6SOded Gabbay * We map the doorbell address space into user-mode when a process creates 4819f6d2a6SOded Gabbay * its first queue on each device. 4919f6d2a6SOded Gabbay * Although the mapping is done by KFD, it is equivalent to an mmap of 5019f6d2a6SOded Gabbay * the /dev/kfd with the particular device encoded in the mmap offset. 5119f6d2a6SOded Gabbay * There will be other uses for mmap of /dev/kfd, so only a range of 5219f6d2a6SOded Gabbay * offsets (KFD_MMAP_DOORBELL_START-END) is used for doorbells. 5319f6d2a6SOded Gabbay */ 5419f6d2a6SOded Gabbay 5519f6d2a6SOded Gabbay /* # of doorbell bytes allocated for each process. */ 5619f6d2a6SOded Gabbay static inline size_t doorbell_process_allocation(void) 5719f6d2a6SOded Gabbay { 5819f6d2a6SOded Gabbay return roundup(KFD_SIZE_OF_DOORBELL_IN_BYTES * 5919f6d2a6SOded Gabbay KFD_MAX_NUM_OF_QUEUES_PER_PROCESS, 6019f6d2a6SOded Gabbay PAGE_SIZE); 6119f6d2a6SOded Gabbay } 6219f6d2a6SOded Gabbay 6319f6d2a6SOded Gabbay /* Doorbell calculations for device init. */ 6419f6d2a6SOded Gabbay void kfd_doorbell_init(struct kfd_dev *kfd) 6519f6d2a6SOded Gabbay { 6619f6d2a6SOded Gabbay size_t doorbell_start_offset; 6719f6d2a6SOded Gabbay size_t doorbell_aperture_size; 6819f6d2a6SOded Gabbay size_t doorbell_process_limit; 6919f6d2a6SOded Gabbay 7019f6d2a6SOded Gabbay /* 7119f6d2a6SOded Gabbay * We start with calculations in bytes because the input data might 7219f6d2a6SOded Gabbay * only be byte-aligned. 7319f6d2a6SOded Gabbay * Only after we have done the rounding can we assume any alignment. 7419f6d2a6SOded Gabbay */ 7519f6d2a6SOded Gabbay 7619f6d2a6SOded Gabbay doorbell_start_offset = 7719f6d2a6SOded Gabbay roundup(kfd->shared_resources.doorbell_start_offset, 7819f6d2a6SOded Gabbay doorbell_process_allocation()); 7919f6d2a6SOded Gabbay 8019f6d2a6SOded Gabbay doorbell_aperture_size = 8119f6d2a6SOded Gabbay rounddown(kfd->shared_resources.doorbell_aperture_size, 8219f6d2a6SOded Gabbay doorbell_process_allocation()); 8319f6d2a6SOded Gabbay 8419f6d2a6SOded Gabbay if (doorbell_aperture_size > doorbell_start_offset) 8519f6d2a6SOded Gabbay doorbell_process_limit = 8619f6d2a6SOded Gabbay (doorbell_aperture_size - doorbell_start_offset) / 8719f6d2a6SOded Gabbay doorbell_process_allocation(); 8819f6d2a6SOded Gabbay else 8919f6d2a6SOded Gabbay doorbell_process_limit = 0; 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 kfd->doorbell_process_limit = doorbell_process_limit - 1; 9619f6d2a6SOded Gabbay 9719f6d2a6SOded Gabbay kfd->doorbell_kernel_ptr = ioremap(kfd->doorbell_base, 9819f6d2a6SOded Gabbay doorbell_process_allocation()); 9919f6d2a6SOded Gabbay 10019f6d2a6SOded Gabbay BUG_ON(!kfd->doorbell_kernel_ptr); 10119f6d2a6SOded Gabbay 10219f6d2a6SOded Gabbay pr_debug("kfd: doorbell initialization:\n"); 10319f6d2a6SOded Gabbay pr_debug("kfd: doorbell base == 0x%08lX\n", 10419f6d2a6SOded Gabbay (uintptr_t)kfd->doorbell_base); 10519f6d2a6SOded Gabbay 10619f6d2a6SOded Gabbay pr_debug("kfd: doorbell_id_offset == 0x%08lX\n", 10719f6d2a6SOded Gabbay kfd->doorbell_id_offset); 10819f6d2a6SOded Gabbay 10919f6d2a6SOded Gabbay pr_debug("kfd: doorbell_process_limit == 0x%08lX\n", 11019f6d2a6SOded Gabbay doorbell_process_limit); 11119f6d2a6SOded Gabbay 11219f6d2a6SOded Gabbay pr_debug("kfd: doorbell_kernel_offset == 0x%08lX\n", 11319f6d2a6SOded Gabbay (uintptr_t)kfd->doorbell_base); 11419f6d2a6SOded Gabbay 11519f6d2a6SOded Gabbay pr_debug("kfd: doorbell aperture size == 0x%08lX\n", 11619f6d2a6SOded Gabbay kfd->shared_resources.doorbell_aperture_size); 11719f6d2a6SOded Gabbay 11819f6d2a6SOded Gabbay pr_debug("kfd: doorbell kernel address == 0x%08lX\n", 11919f6d2a6SOded Gabbay (uintptr_t)kfd->doorbell_kernel_ptr); 12019f6d2a6SOded Gabbay } 12119f6d2a6SOded Gabbay 12219f6d2a6SOded Gabbay int kfd_doorbell_mmap(struct kfd_process *process, struct vm_area_struct *vma) 12319f6d2a6SOded Gabbay { 12419f6d2a6SOded Gabbay phys_addr_t address; 12519f6d2a6SOded Gabbay struct kfd_dev *dev; 12619f6d2a6SOded Gabbay 12719f6d2a6SOded Gabbay /* 12819f6d2a6SOded Gabbay * For simplicitly we only allow mapping of the entire doorbell 12919f6d2a6SOded Gabbay * allocation of a single device & process. 13019f6d2a6SOded Gabbay */ 13119f6d2a6SOded Gabbay if (vma->vm_end - vma->vm_start != doorbell_process_allocation()) 13219f6d2a6SOded Gabbay return -EINVAL; 13319f6d2a6SOded Gabbay 13419f6d2a6SOded Gabbay /* Find kfd device according to gpu id */ 13519f6d2a6SOded Gabbay dev = kfd_device_by_id(vma->vm_pgoff); 13619f6d2a6SOded Gabbay if (dev == NULL) 13719f6d2a6SOded Gabbay return -EINVAL; 13819f6d2a6SOded Gabbay 13919f6d2a6SOded Gabbay /* Find if pdd exists for combination of process and gpu id */ 14019f6d2a6SOded Gabbay if (!kfd_get_process_device_data(dev, process, 0)) 14119f6d2a6SOded Gabbay return -EINVAL; 14219f6d2a6SOded Gabbay 14319f6d2a6SOded Gabbay /* Calculate physical address of doorbell */ 14419f6d2a6SOded Gabbay address = kfd_get_process_doorbells(dev, process); 14519f6d2a6SOded Gabbay 14619f6d2a6SOded Gabbay vma->vm_flags |= VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_NORESERVE | 14719f6d2a6SOded Gabbay VM_DONTDUMP | VM_PFNMAP; 14819f6d2a6SOded Gabbay 14919f6d2a6SOded Gabbay vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 15019f6d2a6SOded Gabbay 15119f6d2a6SOded Gabbay pr_debug("kfd: mapping doorbell page in kfd_doorbell_mmap\n" 15219f6d2a6SOded Gabbay " target user address == 0x%08llX\n" 15319f6d2a6SOded Gabbay " physical address == 0x%08llX\n" 15419f6d2a6SOded Gabbay " vm_flags == 0x%04lX\n" 15519f6d2a6SOded Gabbay " size == 0x%04lX\n", 15619f6d2a6SOded Gabbay (unsigned long long) vma->vm_start, address, vma->vm_flags, 15719f6d2a6SOded Gabbay doorbell_process_allocation()); 15819f6d2a6SOded Gabbay 15919f6d2a6SOded Gabbay 16019f6d2a6SOded Gabbay return io_remap_pfn_range(vma, 16119f6d2a6SOded Gabbay vma->vm_start, 16219f6d2a6SOded Gabbay address >> PAGE_SHIFT, 16319f6d2a6SOded Gabbay doorbell_process_allocation(), 16419f6d2a6SOded Gabbay vma->vm_page_prot); 16519f6d2a6SOded Gabbay } 16619f6d2a6SOded Gabbay 16719f6d2a6SOded Gabbay 16819f6d2a6SOded Gabbay /* get kernel iomem pointer for a doorbell */ 16919f6d2a6SOded Gabbay u32 __iomem *kfd_get_kernel_doorbell(struct kfd_dev *kfd, 17019f6d2a6SOded Gabbay unsigned int *doorbell_off) 17119f6d2a6SOded Gabbay { 17219f6d2a6SOded Gabbay u32 inx; 17319f6d2a6SOded Gabbay 17419f6d2a6SOded Gabbay BUG_ON(!kfd || !doorbell_off); 17519f6d2a6SOded Gabbay 17619f6d2a6SOded Gabbay mutex_lock(&doorbell_mutex); 17719f6d2a6SOded Gabbay inx = find_first_zero_bit(doorbell_available_index, 17819f6d2a6SOded Gabbay KFD_MAX_NUM_OF_QUEUES_PER_PROCESS); 17919f6d2a6SOded Gabbay 18019f6d2a6SOded Gabbay __set_bit(inx, doorbell_available_index); 18119f6d2a6SOded Gabbay mutex_unlock(&doorbell_mutex); 18219f6d2a6SOded Gabbay 18319f6d2a6SOded Gabbay if (inx >= KFD_MAX_NUM_OF_QUEUES_PER_PROCESS) 18419f6d2a6SOded Gabbay return NULL; 18519f6d2a6SOded Gabbay 18619f6d2a6SOded Gabbay /* 18719f6d2a6SOded Gabbay * Calculating the kernel doorbell offset using "faked" kernel 18819f6d2a6SOded Gabbay * pasid that allocated for kernel queues only 18919f6d2a6SOded Gabbay */ 19019f6d2a6SOded Gabbay *doorbell_off = KERNEL_DOORBELL_PASID * (doorbell_process_allocation() / 19119f6d2a6SOded Gabbay sizeof(u32)) + inx; 19219f6d2a6SOded Gabbay 19319f6d2a6SOded Gabbay pr_debug("kfd: get kernel queue doorbell\n" 19419f6d2a6SOded Gabbay " doorbell offset == 0x%08d\n" 19519f6d2a6SOded Gabbay " kernel address == 0x%08lX\n", 19619f6d2a6SOded Gabbay *doorbell_off, (uintptr_t)(kfd->doorbell_kernel_ptr + inx)); 19719f6d2a6SOded Gabbay 19819f6d2a6SOded Gabbay return kfd->doorbell_kernel_ptr + inx; 19919f6d2a6SOded Gabbay } 20019f6d2a6SOded Gabbay 20119f6d2a6SOded Gabbay void kfd_release_kernel_doorbell(struct kfd_dev *kfd, u32 __iomem *db_addr) 20219f6d2a6SOded Gabbay { 20319f6d2a6SOded Gabbay unsigned int inx; 20419f6d2a6SOded Gabbay 20519f6d2a6SOded Gabbay BUG_ON(!kfd || !db_addr); 20619f6d2a6SOded Gabbay 20719f6d2a6SOded Gabbay inx = (unsigned int)(db_addr - kfd->doorbell_kernel_ptr); 20819f6d2a6SOded Gabbay 20919f6d2a6SOded Gabbay mutex_lock(&doorbell_mutex); 21019f6d2a6SOded Gabbay __clear_bit(inx, doorbell_available_index); 21119f6d2a6SOded Gabbay mutex_unlock(&doorbell_mutex); 21219f6d2a6SOded Gabbay } 21319f6d2a6SOded Gabbay 21419f6d2a6SOded Gabbay inline void write_kernel_doorbell(u32 __iomem *db, u32 value) 21519f6d2a6SOded Gabbay { 21619f6d2a6SOded Gabbay if (db) { 21719f6d2a6SOded Gabbay writel(value, db); 21819f6d2a6SOded Gabbay pr_debug("writing %d to doorbell address 0x%p\n", value, db); 21919f6d2a6SOded Gabbay } 22019f6d2a6SOded Gabbay } 22119f6d2a6SOded Gabbay 22219f6d2a6SOded Gabbay /* 22319f6d2a6SOded Gabbay * queue_ids are in the range [0,MAX_PROCESS_QUEUES) and are mapped 1:1 22419f6d2a6SOded Gabbay * to doorbells with the process's doorbell page 22519f6d2a6SOded Gabbay */ 22619f6d2a6SOded Gabbay unsigned int kfd_queue_id_to_doorbell(struct kfd_dev *kfd, 22719f6d2a6SOded Gabbay struct kfd_process *process, 22819f6d2a6SOded Gabbay unsigned int queue_id) 22919f6d2a6SOded Gabbay { 23019f6d2a6SOded Gabbay /* 23119f6d2a6SOded Gabbay * doorbell_id_offset accounts for doorbells taken by KGD. 23219f6d2a6SOded Gabbay * pasid * doorbell_process_allocation/sizeof(u32) adjusts 23319f6d2a6SOded Gabbay * to the process's doorbells 23419f6d2a6SOded Gabbay */ 23519f6d2a6SOded Gabbay return kfd->doorbell_id_offset + 23619f6d2a6SOded Gabbay process->pasid * (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 + 25419f6d2a6SOded Gabbay process->pasid * doorbell_process_allocation(); 25519f6d2a6SOded Gabbay } 256