273 lines
7.9 KiB
C
273 lines
7.9 KiB
C
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/*
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* Copyright 2014 Advanced Micro Devices, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "kfd_priv.h"
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#include <linux/mm.h>
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#include <linux/mman.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/idr.h>
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/*
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* This extension supports a kernel level doorbells management for the
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* kernel queues using the first doorbell page reserved for the kernel.
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*/
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static DEFINE_IDA(doorbell_ida);
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static unsigned int max_doorbell_slices;
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#define KFD_SIZE_OF_DOORBELL_IN_BYTES 4
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/*
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* Each device exposes a doorbell aperture, a PCI MMIO aperture that
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* receives 32-bit writes that are passed to queues as wptr values.
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* The doorbells are intended to be written by applications as part
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* of queueing work on user-mode queues.
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* We assign doorbells to applications in PAGE_SIZE-sized and aligned chunks.
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* We map the doorbell address space into user-mode when a process creates
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* its first queue on each device.
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* Although the mapping is done by KFD, it is equivalent to an mmap of
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* the /dev/kfd with the particular device encoded in the mmap offset.
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* There will be other uses for mmap of /dev/kfd, so only a range of
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* offsets (KFD_MMAP_DOORBELL_START-END) is used for doorbells.
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*/
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/* # of doorbell bytes allocated for each process. */
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static inline size_t doorbell_process_allocation(void)
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{
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return roundup(KFD_SIZE_OF_DOORBELL_IN_BYTES *
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KFD_MAX_NUM_OF_QUEUES_PER_PROCESS,
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PAGE_SIZE);
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}
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/* Doorbell calculations for device init. */
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int kfd_doorbell_init(struct kfd_dev *kfd)
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{
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size_t doorbell_start_offset;
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size_t doorbell_aperture_size;
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size_t doorbell_process_limit;
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/*
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* We start with calculations in bytes because the input data might
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* only be byte-aligned.
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* Only after we have done the rounding can we assume any alignment.
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*/
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doorbell_start_offset =
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roundup(kfd->shared_resources.doorbell_start_offset,
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doorbell_process_allocation());
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doorbell_aperture_size =
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rounddown(kfd->shared_resources.doorbell_aperture_size,
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doorbell_process_allocation());
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if (doorbell_aperture_size > doorbell_start_offset)
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doorbell_process_limit =
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(doorbell_aperture_size - doorbell_start_offset) /
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doorbell_process_allocation();
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else
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return -ENOSPC;
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if (!max_doorbell_slices ||
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doorbell_process_limit < max_doorbell_slices)
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max_doorbell_slices = doorbell_process_limit;
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kfd->doorbell_base = kfd->shared_resources.doorbell_physical_address +
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doorbell_start_offset;
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kfd->doorbell_id_offset = doorbell_start_offset / sizeof(u32);
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kfd->doorbell_kernel_ptr = ioremap(kfd->doorbell_base,
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doorbell_process_allocation());
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if (!kfd->doorbell_kernel_ptr)
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return -ENOMEM;
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pr_debug("Doorbell initialization:\n");
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pr_debug("doorbell base == 0x%08lX\n",
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(uintptr_t)kfd->doorbell_base);
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pr_debug("doorbell_id_offset == 0x%08lX\n",
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kfd->doorbell_id_offset);
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pr_debug("doorbell_process_limit == 0x%08lX\n",
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doorbell_process_limit);
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pr_debug("doorbell_kernel_offset == 0x%08lX\n",
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(uintptr_t)kfd->doorbell_base);
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pr_debug("doorbell aperture size == 0x%08lX\n",
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kfd->shared_resources.doorbell_aperture_size);
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pr_debug("doorbell kernel address == 0x%08lX\n",
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(uintptr_t)kfd->doorbell_kernel_ptr);
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return 0;
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}
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void kfd_doorbell_fini(struct kfd_dev *kfd)
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{
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if (kfd->doorbell_kernel_ptr)
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iounmap(kfd->doorbell_kernel_ptr);
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}
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int kfd_doorbell_mmap(struct kfd_process *process, struct vm_area_struct *vma)
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{
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phys_addr_t address;
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struct kfd_dev *dev;
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/*
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* For simplicitly we only allow mapping of the entire doorbell
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* allocation of a single device & process.
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*/
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if (vma->vm_end - vma->vm_start != doorbell_process_allocation())
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return -EINVAL;
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/* Find kfd device according to gpu id */
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dev = kfd_device_by_id(vma->vm_pgoff);
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if (!dev)
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return -EINVAL;
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/* Calculate physical address of doorbell */
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address = kfd_get_process_doorbells(dev, process);
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vma->vm_flags |= VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_NORESERVE |
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VM_DONTDUMP | VM_PFNMAP;
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vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
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pr_debug("Mapping doorbell page\n"
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" target user address == 0x%08llX\n"
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" physical address == 0x%08llX\n"
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" vm_flags == 0x%04lX\n"
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" size == 0x%04lX\n",
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(unsigned long long) vma->vm_start, address, vma->vm_flags,
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doorbell_process_allocation());
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return io_remap_pfn_range(vma,
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vma->vm_start,
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address >> PAGE_SHIFT,
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doorbell_process_allocation(),
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vma->vm_page_prot);
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}
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/* get kernel iomem pointer for a doorbell */
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u32 __iomem *kfd_get_kernel_doorbell(struct kfd_dev *kfd,
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unsigned int *doorbell_off)
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{
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u32 inx;
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mutex_lock(&kfd->doorbell_mutex);
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inx = find_first_zero_bit(kfd->doorbell_available_index,
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KFD_MAX_NUM_OF_QUEUES_PER_PROCESS);
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__set_bit(inx, kfd->doorbell_available_index);
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mutex_unlock(&kfd->doorbell_mutex);
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if (inx >= KFD_MAX_NUM_OF_QUEUES_PER_PROCESS)
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return NULL;
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/*
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* Calculating the kernel doorbell offset using the first
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* doorbell page.
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*/
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*doorbell_off = kfd->doorbell_id_offset + inx;
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pr_debug("Get kernel queue doorbell\n"
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" doorbell offset == 0x%08X\n"
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" kernel address == 0x%08lX\n",
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*doorbell_off, (uintptr_t)(kfd->doorbell_kernel_ptr + inx));
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return kfd->doorbell_kernel_ptr + inx;
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}
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void kfd_release_kernel_doorbell(struct kfd_dev *kfd, u32 __iomem *db_addr)
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{
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unsigned int inx;
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inx = (unsigned int)(db_addr - kfd->doorbell_kernel_ptr);
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mutex_lock(&kfd->doorbell_mutex);
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__clear_bit(inx, kfd->doorbell_available_index);
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mutex_unlock(&kfd->doorbell_mutex);
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}
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inline void write_kernel_doorbell(u32 __iomem *db, u32 value)
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{
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if (db) {
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writel(value, db);
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pr_debug("Writing %d to doorbell address 0x%p\n", value, db);
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}
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}
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/*
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* queue_ids are in the range [0,MAX_PROCESS_QUEUES) and are mapped 1:1
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* to doorbells with the process's doorbell page
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*/
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unsigned int kfd_queue_id_to_doorbell(struct kfd_dev *kfd,
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struct kfd_process *process,
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unsigned int queue_id)
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{
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/*
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* doorbell_id_offset accounts for doorbells taken by KGD.
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* index * doorbell_process_allocation/sizeof(u32) adjusts to
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* the process's doorbells.
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*/
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return kfd->doorbell_id_offset +
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process->doorbell_index
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* doorbell_process_allocation() / sizeof(u32) +
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queue_id;
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}
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uint64_t kfd_get_number_elems(struct kfd_dev *kfd)
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{
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uint64_t num_of_elems = (kfd->shared_resources.doorbell_aperture_size -
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kfd->shared_resources.doorbell_start_offset) /
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doorbell_process_allocation() + 1;
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return num_of_elems;
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}
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phys_addr_t kfd_get_process_doorbells(struct kfd_dev *dev,
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struct kfd_process *process)
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{
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return dev->doorbell_base +
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process->doorbell_index * doorbell_process_allocation();
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}
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int kfd_alloc_process_doorbells(struct kfd_process *process)
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{
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int r = ida_simple_get(&doorbell_ida, 1, max_doorbell_slices,
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GFP_KERNEL);
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if (r > 0)
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process->doorbell_index = r;
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return r;
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}
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void kfd_free_process_doorbells(struct kfd_process *process)
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{
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if (process->doorbell_index)
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ida_simple_remove(&doorbell_ida, process->doorbell_index);
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}
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