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1// SPDX-License-Identifier: GPL-2.0 OR MIT2/*3 * Copyright 2014-2022 Advanced Micro Devices, Inc.4 *5 * Permission is hereby granted, free of charge, to any person obtaining a6 * copy of this software and associated documentation files (the "Software"),7 * to deal in the Software without restriction, including without limitation8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,9 * and/or sell copies of the Software, and to permit persons to whom the10 * Software is furnished to do so, subject to the following conditions:11 *12 * The above copyright notice and this permission notice shall be included in13 * all copies or substantial portions of the Software.14 *15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR21 * OTHER DEALINGS IN THE SOFTWARE.22 */23#include "kfd_priv.h"24#include <linux/mm.h>25#include <linux/mman.h>26#include <linux/slab.h>27#include <linux/io.h>28#include <linux/idr.h>29 30/*31 * This extension supports a kernel level doorbells management for the32 * kernel queues using the first doorbell page reserved for the kernel.33 */34 35/*36 * Each device exposes a doorbell aperture, a PCI MMIO aperture that37 * receives 32-bit writes that are passed to queues as wptr values.38 * The doorbells are intended to be written by applications as part39 * of queueing work on user-mode queues.40 * We assign doorbells to applications in PAGE_SIZE-sized and aligned chunks.41 * We map the doorbell address space into user-mode when a process creates42 * its first queue on each device.43 * Although the mapping is done by KFD, it is equivalent to an mmap of44 * the /dev/kfd with the particular device encoded in the mmap offset.45 * There will be other uses for mmap of /dev/kfd, so only a range of46 * offsets (KFD_MMAP_DOORBELL_START-END) is used for doorbells.47 */48 49/* # of doorbell bytes allocated for each process. */50size_t kfd_doorbell_process_slice(struct kfd_dev *kfd)51{52	if (!kfd->shared_resources.enable_mes)53		return roundup(kfd->device_info.doorbell_size *54				KFD_MAX_NUM_OF_QUEUES_PER_PROCESS,55				PAGE_SIZE);56	else57		return amdgpu_mes_doorbell_process_slice(58					(struct amdgpu_device *)kfd->adev);59}60 61/* Doorbell calculations for device init. */62int kfd_doorbell_init(struct kfd_dev *kfd)63{64	int size = PAGE_SIZE;65	int r;66 67	/*68	 * Todo: KFD kernel level operations need only one doorbell for69	 * ring test/HWS. So instead of reserving a whole page here for70	 * kernel, reserve and consume a doorbell from existing KGD kernel71	 * doorbell page.72	 */73 74	/* Bitmap to dynamically allocate doorbells from kernel page */75	kfd->doorbell_bitmap = bitmap_zalloc(size / sizeof(u32), GFP_KERNEL);76	if (!kfd->doorbell_bitmap) {77		DRM_ERROR("Failed to allocate kernel doorbell bitmap\n");78		return -ENOMEM;79	}80 81	/* Alloc a doorbell page for KFD kernel usages */82	r = amdgpu_bo_create_kernel(kfd->adev,83				    size,84				    PAGE_SIZE,85				    AMDGPU_GEM_DOMAIN_DOORBELL,86				    &kfd->doorbells,87				    NULL,88				    (void **)&kfd->doorbell_kernel_ptr);89	if (r) {90		pr_err("failed to allocate kernel doorbells\n");91		bitmap_free(kfd->doorbell_bitmap);92		return r;93	}94 95	pr_debug("Doorbell kernel address == %p\n", kfd->doorbell_kernel_ptr);96	return 0;97}98 99void kfd_doorbell_fini(struct kfd_dev *kfd)100{101	bitmap_free(kfd->doorbell_bitmap);102	amdgpu_bo_free_kernel(&kfd->doorbells, NULL,103			     (void **)&kfd->doorbell_kernel_ptr);104}105 106int kfd_doorbell_mmap(struct kfd_node *dev, struct kfd_process *process,107		      struct vm_area_struct *vma)108{109	phys_addr_t address;110	struct kfd_process_device *pdd;111 112	/*113	 * For simplicitly we only allow mapping of the entire doorbell114	 * allocation of a single device & process.115	 */116	if (vma->vm_end - vma->vm_start != kfd_doorbell_process_slice(dev->kfd))117		return -EINVAL;118 119	pdd = kfd_get_process_device_data(dev, process);120	if (!pdd)121		return -EINVAL;122 123	/* Calculate physical address of doorbell */124	address = kfd_get_process_doorbells(pdd);125	if (!address)126		return -ENOMEM;127	vm_flags_set(vma, VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_NORESERVE |128				VM_DONTDUMP | VM_PFNMAP);129 130	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);131 132	pr_debug("Mapping doorbell page\n"133		 "     target user address == 0x%08llX\n"134		 "     physical address    == 0x%08llX\n"135		 "     vm_flags            == 0x%04lX\n"136		 "     size                == 0x%04lX\n",137		 (unsigned long long) vma->vm_start, address, vma->vm_flags,138		 kfd_doorbell_process_slice(dev->kfd));139 140 141	return io_remap_pfn_range(vma,142				vma->vm_start,143				address >> PAGE_SHIFT,144				kfd_doorbell_process_slice(dev->kfd),145				vma->vm_page_prot);146}147 148 149/* get kernel iomem pointer for a doorbell */150void __iomem *kfd_get_kernel_doorbell(struct kfd_dev *kfd,151					unsigned int *doorbell_off)152{153	u32 inx;154 155	mutex_lock(&kfd->doorbell_mutex);156	inx = find_first_zero_bit(kfd->doorbell_bitmap, PAGE_SIZE / sizeof(u32));157 158	__set_bit(inx, kfd->doorbell_bitmap);159	mutex_unlock(&kfd->doorbell_mutex);160 161	if (inx >= KFD_MAX_NUM_OF_QUEUES_PER_PROCESS)162		return NULL;163 164	*doorbell_off = amdgpu_doorbell_index_on_bar(kfd->adev,165						     kfd->doorbells,166						     inx,167						     kfd->device_info.doorbell_size);168	inx *= 2;169 170	pr_debug("Get kernel queue doorbell\n"171			"     doorbell offset   == 0x%08X\n"172			"     doorbell index    == 0x%x\n",173		*doorbell_off, inx);174 175	return kfd->doorbell_kernel_ptr + inx;176}177 178void kfd_release_kernel_doorbell(struct kfd_dev *kfd, u32 __iomem *db_addr)179{180	unsigned int inx;181 182	inx = (unsigned int)(db_addr - kfd->doorbell_kernel_ptr);183	inx /= 2;184 185	mutex_lock(&kfd->doorbell_mutex);186	__clear_bit(inx, kfd->doorbell_bitmap);187	mutex_unlock(&kfd->doorbell_mutex);188}189 190void write_kernel_doorbell(void __iomem *db, u32 value)191{192	if (db) {193		writel(value, db);194		pr_debug("Writing %d to doorbell address %p\n", value, db);195	}196}197 198void write_kernel_doorbell64(void __iomem *db, u64 value)199{200	if (db) {201		WARN(((unsigned long)db & 7) != 0,202		     "Unaligned 64-bit doorbell");203		writeq(value, (u64 __iomem *)db);204		pr_debug("writing %llu to doorbell address %p\n", value, db);205	}206}207 208static int init_doorbell_bitmap(struct qcm_process_device *qpd,209				struct kfd_dev *dev)210{211	unsigned int i;212	int range_start = dev->shared_resources.non_cp_doorbells_start;213	int range_end = dev->shared_resources.non_cp_doorbells_end;214 215	if (!KFD_IS_SOC15(dev))216		return 0;217 218	/* Mask out doorbells reserved for SDMA, IH, and VCN on SOC15. */219	pr_debug("reserved doorbell 0x%03x - 0x%03x\n", range_start, range_end);220	pr_debug("reserved doorbell 0x%03x - 0x%03x\n",221			range_start + KFD_QUEUE_DOORBELL_MIRROR_OFFSET,222			range_end + KFD_QUEUE_DOORBELL_MIRROR_OFFSET);223 224	for (i = 0; i < KFD_MAX_NUM_OF_QUEUES_PER_PROCESS / 2; i++) {225		if (i >= range_start && i <= range_end) {226			__set_bit(i, qpd->doorbell_bitmap);227			__set_bit(i + KFD_QUEUE_DOORBELL_MIRROR_OFFSET,228				  qpd->doorbell_bitmap);229		}230	}231 232	return 0;233}234 235phys_addr_t kfd_get_process_doorbells(struct kfd_process_device *pdd)236{237	struct amdgpu_device *adev = pdd->dev->adev;238	uint32_t first_db_index;239 240	if (!pdd->qpd.proc_doorbells) {241		if (kfd_alloc_process_doorbells(pdd->dev->kfd, pdd))242			/* phys_addr_t 0 is error */243			return 0;244	}245 246	first_db_index = amdgpu_doorbell_index_on_bar(adev,247						      pdd->qpd.proc_doorbells,248						      0,249						      pdd->dev->kfd->device_info.doorbell_size);250	return adev->doorbell.base + first_db_index * sizeof(uint32_t);251}252 253int kfd_alloc_process_doorbells(struct kfd_dev *kfd, struct kfd_process_device *pdd)254{255	int r;256	struct qcm_process_device *qpd = &pdd->qpd;257 258	/* Allocate bitmap for dynamic doorbell allocation */259	qpd->doorbell_bitmap = bitmap_zalloc(KFD_MAX_NUM_OF_QUEUES_PER_PROCESS,260					     GFP_KERNEL);261	if (!qpd->doorbell_bitmap) {262		DRM_ERROR("Failed to allocate process doorbell bitmap\n");263		return -ENOMEM;264	}265 266	r = init_doorbell_bitmap(&pdd->qpd, kfd);267	if (r) {268		DRM_ERROR("Failed to initialize process doorbells\n");269		r = -ENOMEM;270		goto err;271	}272 273	/* Allocate doorbells for this process */274	r = amdgpu_bo_create_kernel(kfd->adev,275				    kfd_doorbell_process_slice(kfd),276				    PAGE_SIZE,277				    AMDGPU_GEM_DOMAIN_DOORBELL,278				    &qpd->proc_doorbells,279				    NULL,280				    NULL);281	if (r) {282		DRM_ERROR("Failed to allocate process doorbells\n");283		goto err;284	}285	return 0;286 287err:288	bitmap_free(qpd->doorbell_bitmap);289	qpd->doorbell_bitmap = NULL;290	return r;291}292 293void kfd_free_process_doorbells(struct kfd_dev *kfd, struct kfd_process_device *pdd)294{295	struct qcm_process_device *qpd = &pdd->qpd;296 297	if (qpd->doorbell_bitmap) {298		bitmap_free(qpd->doorbell_bitmap);299		qpd->doorbell_bitmap = NULL;300	}301 302	amdgpu_bo_free_kernel(&qpd->proc_doorbells, NULL, NULL);303}304