1d87f36a0SRajneesh Bhardwaj // SPDX-License-Identifier: GPL-2.0 OR MIT
219f6d2a6SOded Gabbay /*
3d87f36a0SRajneesh Bhardwaj * Copyright 2014-2022 Advanced Micro Devices, Inc.
419f6d2a6SOded Gabbay *
519f6d2a6SOded Gabbay * Permission is hereby granted, free of charge, to any person obtaining a
619f6d2a6SOded Gabbay * copy of this software and associated documentation files (the "Software"),
719f6d2a6SOded Gabbay * to deal in the Software without restriction, including without limitation
819f6d2a6SOded Gabbay * the rights to use, copy, modify, merge, publish, distribute, sublicense,
919f6d2a6SOded Gabbay * and/or sell copies of the Software, and to permit persons to whom the
1019f6d2a6SOded Gabbay * Software is furnished to do so, subject to the following conditions:
1119f6d2a6SOded Gabbay *
1219f6d2a6SOded Gabbay * The above copyright notice and this permission notice shall be included in
1319f6d2a6SOded Gabbay * all copies or substantial portions of the Software.
1419f6d2a6SOded Gabbay *
1519f6d2a6SOded Gabbay * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
1619f6d2a6SOded Gabbay * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
1719f6d2a6SOded Gabbay * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
1819f6d2a6SOded Gabbay * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
1919f6d2a6SOded Gabbay * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
2019f6d2a6SOded Gabbay * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
2119f6d2a6SOded Gabbay * OTHER DEALINGS IN THE SOFTWARE.
2219f6d2a6SOded Gabbay */
2319f6d2a6SOded Gabbay #include "kfd_priv.h"
2419f6d2a6SOded Gabbay #include <linux/mm.h>
2519f6d2a6SOded Gabbay #include <linux/mman.h>
2619f6d2a6SOded Gabbay #include <linux/slab.h>
27824cb7d1SOded Gabbay #include <linux/io.h>
28a91e70e3SFelix Kuehling #include <linux/idr.h>
2919f6d2a6SOded Gabbay
3019f6d2a6SOded Gabbay /*
31a91e70e3SFelix Kuehling * This extension supports a kernel level doorbells management for the
32a91e70e3SFelix Kuehling * kernel queues using the first doorbell page reserved for the kernel.
3319f6d2a6SOded Gabbay */
3419f6d2a6SOded Gabbay
3519f6d2a6SOded Gabbay /*
3619f6d2a6SOded Gabbay * Each device exposes a doorbell aperture, a PCI MMIO aperture that
3719f6d2a6SOded Gabbay * receives 32-bit writes that are passed to queues as wptr values.
3819f6d2a6SOded Gabbay * The doorbells are intended to be written by applications as part
3919f6d2a6SOded Gabbay * of queueing work on user-mode queues.
4019f6d2a6SOded Gabbay * We assign doorbells to applications in PAGE_SIZE-sized and aligned chunks.
4119f6d2a6SOded Gabbay * We map the doorbell address space into user-mode when a process creates
4219f6d2a6SOded Gabbay * its first queue on each device.
4319f6d2a6SOded Gabbay * Although the mapping is done by KFD, it is equivalent to an mmap of
4419f6d2a6SOded Gabbay * the /dev/kfd with the particular device encoded in the mmap offset.
4519f6d2a6SOded Gabbay * There will be other uses for mmap of /dev/kfd, so only a range of
4619f6d2a6SOded Gabbay * offsets (KFD_MMAP_DOORBELL_START-END) is used for doorbells.
4719f6d2a6SOded Gabbay */
4819f6d2a6SOded Gabbay
4919f6d2a6SOded Gabbay /* # of doorbell bytes allocated for each process. */
kfd_doorbell_process_slice(struct kfd_dev * kfd)50ef568db7SFelix Kuehling size_t kfd_doorbell_process_slice(struct kfd_dev *kfd)
5119f6d2a6SOded Gabbay {
52cc009e61SMukul Joshi if (!kfd->shared_resources.enable_mes)
53f0dc99a6SGraham Sider return roundup(kfd->device_info.doorbell_size *
5419f6d2a6SOded Gabbay KFD_MAX_NUM_OF_QUEUES_PER_PROCESS,
5519f6d2a6SOded Gabbay PAGE_SIZE);
56cc009e61SMukul Joshi else
57cc009e61SMukul Joshi return amdgpu_mes_doorbell_process_slice(
58cc009e61SMukul Joshi (struct amdgpu_device *)kfd->adev);
5919f6d2a6SOded Gabbay }
6019f6d2a6SOded Gabbay
6119f6d2a6SOded Gabbay /* Doorbell calculations for device init. */
kfd_doorbell_init(struct kfd_dev * kfd)62735df2baSFelix Kuehling int kfd_doorbell_init(struct kfd_dev *kfd)
6319f6d2a6SOded Gabbay {
64c3186665SShashank Sharma int size = PAGE_SIZE;
65c3186665SShashank Sharma int r;
6619f6d2a6SOded Gabbay
6719f6d2a6SOded Gabbay /*
68c3186665SShashank Sharma * Todo: KFD kernel level operations need only one doorbell for
69c3186665SShashank Sharma * ring test/HWS. So instead of reserving a whole page here for
70c3186665SShashank Sharma * kernel, reserve and consume a doorbell from existing KGD kernel
71c3186665SShashank Sharma * doorbell page.
72cc009e61SMukul Joshi */
73c3186665SShashank Sharma
74c3186665SShashank Sharma /* Bitmap to dynamically allocate doorbells from kernel page */
75c3186665SShashank Sharma kfd->doorbell_bitmap = bitmap_zalloc(size / sizeof(u32), GFP_KERNEL);
76c3186665SShashank Sharma if (!kfd->doorbell_bitmap) {
77c3186665SShashank Sharma DRM_ERROR("Failed to allocate kernel doorbell bitmap\n");
78c3186665SShashank Sharma return -ENOMEM;
79cc009e61SMukul Joshi }
80cc009e61SMukul Joshi
81c3186665SShashank Sharma /* Alloc a doorbell page for KFD kernel usages */
82c3186665SShashank Sharma r = amdgpu_bo_create_kernel(kfd->adev,
83c3186665SShashank Sharma size,
84c3186665SShashank Sharma PAGE_SIZE,
85c3186665SShashank Sharma AMDGPU_GEM_DOMAIN_DOORBELL,
86c3186665SShashank Sharma &kfd->doorbells,
87c3186665SShashank Sharma NULL,
88c3186665SShashank Sharma (void **)&kfd->doorbell_kernel_ptr);
89c3186665SShashank Sharma if (r) {
90c3186665SShashank Sharma pr_err("failed to allocate kernel doorbells\n");
91c3186665SShashank Sharma bitmap_free(kfd->doorbell_bitmap);
92c3186665SShashank Sharma return r;
93c3186665SShashank Sharma }
9419f6d2a6SOded Gabbay
95c3186665SShashank Sharma pr_debug("Doorbell kernel address == %p\n", kfd->doorbell_kernel_ptr);
96735df2baSFelix Kuehling return 0;
97735df2baSFelix Kuehling }
98735df2baSFelix Kuehling
kfd_doorbell_fini(struct kfd_dev * kfd)99735df2baSFelix Kuehling void kfd_doorbell_fini(struct kfd_dev *kfd)
100735df2baSFelix Kuehling {
101c3186665SShashank Sharma bitmap_free(kfd->doorbell_bitmap);
102c3186665SShashank Sharma amdgpu_bo_free_kernel(&kfd->doorbells, NULL,
103c3186665SShashank Sharma (void **)&kfd->doorbell_kernel_ptr);
10419f6d2a6SOded Gabbay }
10519f6d2a6SOded Gabbay
kfd_doorbell_mmap(struct kfd_node * dev,struct kfd_process * process,struct vm_area_struct * vma)1068dc1db31SMukul Joshi int kfd_doorbell_mmap(struct kfd_node *dev, struct kfd_process *process,
107df03ef93SHarish Kasiviswanathan struct vm_area_struct *vma)
10819f6d2a6SOded Gabbay {
10919f6d2a6SOded Gabbay phys_addr_t address;
11059d7115dSMukul Joshi struct kfd_process_device *pdd;
111ada2b29cSFelix Kuehling
11219f6d2a6SOded Gabbay /*
11319f6d2a6SOded Gabbay * For simplicitly we only allow mapping of the entire doorbell
11419f6d2a6SOded Gabbay * allocation of a single device & process.
11519f6d2a6SOded Gabbay */
1168dc1db31SMukul Joshi if (vma->vm_end - vma->vm_start != kfd_doorbell_process_slice(dev->kfd))
11719f6d2a6SOded Gabbay return -EINVAL;
11819f6d2a6SOded Gabbay
11959d7115dSMukul Joshi pdd = kfd_get_process_device_data(dev, process);
12059d7115dSMukul Joshi if (!pdd)
12159d7115dSMukul Joshi return -EINVAL;
12219f6d2a6SOded Gabbay
12359d7115dSMukul Joshi /* Calculate physical address of doorbell */
12459d7115dSMukul Joshi address = kfd_get_process_doorbells(pdd);
12516f00131SFelix Kuehling if (!address)
12616f00131SFelix Kuehling return -ENOMEM;
1271c71222eSSuren Baghdasaryan vm_flags_set(vma, VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_NORESERVE |
1281c71222eSSuren Baghdasaryan VM_DONTDUMP | VM_PFNMAP);
12919f6d2a6SOded Gabbay
13019f6d2a6SOded Gabbay vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
13119f6d2a6SOded Gabbay
13279775b62SKent Russell pr_debug("Mapping doorbell page\n"
1336f4d92a1SEdward O'Callaghan " target user address == 0x%08llX\n"
1346f4d92a1SEdward O'Callaghan " physical address == 0x%08llX\n"
1356f4d92a1SEdward O'Callaghan " vm_flags == 0x%04lX\n"
1366f4d92a1SEdward O'Callaghan " size == 0x%04lX\n",
1376f4d92a1SEdward O'Callaghan (unsigned long long) vma->vm_start, address, vma->vm_flags,
1388dc1db31SMukul Joshi kfd_doorbell_process_slice(dev->kfd));
13919f6d2a6SOded Gabbay
1406f4d92a1SEdward O'Callaghan
14119f6d2a6SOded Gabbay return io_remap_pfn_range(vma,
14219f6d2a6SOded Gabbay vma->vm_start,
14319f6d2a6SOded Gabbay address >> PAGE_SHIFT,
1448dc1db31SMukul Joshi kfd_doorbell_process_slice(dev->kfd),
14519f6d2a6SOded Gabbay vma->vm_page_prot);
14619f6d2a6SOded Gabbay }
14719f6d2a6SOded Gabbay
14819f6d2a6SOded Gabbay
14919f6d2a6SOded Gabbay /* get kernel iomem pointer for a doorbell */
kfd_get_kernel_doorbell(struct kfd_dev * kfd,unsigned int * doorbell_off)150ada2b29cSFelix Kuehling void __iomem *kfd_get_kernel_doorbell(struct kfd_dev *kfd,
15119f6d2a6SOded Gabbay unsigned int *doorbell_off)
15219f6d2a6SOded Gabbay {
15319f6d2a6SOded Gabbay u32 inx;
15419f6d2a6SOded Gabbay
155cea405b1SXihan Zhang mutex_lock(&kfd->doorbell_mutex);
156c3186665SShashank Sharma inx = find_first_zero_bit(kfd->doorbell_bitmap, PAGE_SIZE / sizeof(u32));
15719f6d2a6SOded Gabbay
158c3186665SShashank Sharma __set_bit(inx, kfd->doorbell_bitmap);
159cea405b1SXihan Zhang mutex_unlock(&kfd->doorbell_mutex);
16019f6d2a6SOded Gabbay
16119f6d2a6SOded Gabbay if (inx >= KFD_MAX_NUM_OF_QUEUES_PER_PROCESS)
16219f6d2a6SOded Gabbay return NULL;
16319f6d2a6SOded Gabbay
164*45d72eadSArvind Yadav *doorbell_off = amdgpu_doorbell_index_on_bar(kfd->adev,
165*45d72eadSArvind Yadav kfd->doorbells,
166*45d72eadSArvind Yadav inx,
167*45d72eadSArvind Yadav kfd->device_info.doorbell_size);
1682f06b274SMukul Joshi inx *= 2;
16919f6d2a6SOded Gabbay
17079775b62SKent Russell pr_debug("Get kernel queue doorbell\n"
1716dae6162SColin Ian King " doorbell offset == 0x%08X\n"
172951df6d9SShaoyun Liu " doorbell index == 0x%x\n",
173951df6d9SShaoyun Liu *doorbell_off, inx);
17419f6d2a6SOded Gabbay
17519f6d2a6SOded Gabbay return kfd->doorbell_kernel_ptr + inx;
17619f6d2a6SOded Gabbay }
17719f6d2a6SOded Gabbay
kfd_release_kernel_doorbell(struct kfd_dev * kfd,u32 __iomem * db_addr)17819f6d2a6SOded Gabbay void kfd_release_kernel_doorbell(struct kfd_dev *kfd, u32 __iomem *db_addr)
17919f6d2a6SOded Gabbay {
18019f6d2a6SOded Gabbay unsigned int inx;
18119f6d2a6SOded Gabbay
182c3186665SShashank Sharma inx = (unsigned int)(db_addr - kfd->doorbell_kernel_ptr);
1832f06b274SMukul Joshi inx /= 2;
18419f6d2a6SOded Gabbay
185cea405b1SXihan Zhang mutex_lock(&kfd->doorbell_mutex);
186c3186665SShashank Sharma __clear_bit(inx, kfd->doorbell_bitmap);
187cea405b1SXihan Zhang mutex_unlock(&kfd->doorbell_mutex);
18819f6d2a6SOded Gabbay }
18919f6d2a6SOded Gabbay
write_kernel_doorbell(void __iomem * db,u32 value)190ada2b29cSFelix Kuehling void write_kernel_doorbell(void __iomem *db, u32 value)
19119f6d2a6SOded Gabbay {
19219f6d2a6SOded Gabbay if (db) {
19319f6d2a6SOded Gabbay writel(value, db);
1948f8fb9b9SKent Russell pr_debug("Writing %d to doorbell address %p\n", value, db);
19519f6d2a6SOded Gabbay }
19619f6d2a6SOded Gabbay }
19719f6d2a6SOded Gabbay
write_kernel_doorbell64(void __iomem * db,u64 value)1989d7d0248SFelix Kuehling void write_kernel_doorbell64(void __iomem *db, u64 value)
1999d7d0248SFelix Kuehling {
2009d7d0248SFelix Kuehling if (db) {
2019d7d0248SFelix Kuehling WARN(((unsigned long)db & 7) != 0,
2029d7d0248SFelix Kuehling "Unaligned 64-bit doorbell");
2039d7d0248SFelix Kuehling writeq(value, (u64 __iomem *)db);
2049d7d0248SFelix Kuehling pr_debug("writing %llu to doorbell address %p\n", value, db);
2059d7d0248SFelix Kuehling }
2069d7d0248SFelix Kuehling }
2079d7d0248SFelix Kuehling
init_doorbell_bitmap(struct qcm_process_device * qpd,struct kfd_dev * dev)2082105a15aSShashank Sharma static int init_doorbell_bitmap(struct qcm_process_device *qpd,
2092105a15aSShashank Sharma struct kfd_dev *dev)
21019f6d2a6SOded Gabbay {
2112105a15aSShashank Sharma unsigned int i;
2122105a15aSShashank Sharma int range_start = dev->shared_resources.non_cp_doorbells_start;
2132105a15aSShashank Sharma int range_end = dev->shared_resources.non_cp_doorbells_end;
2142105a15aSShashank Sharma
2152105a15aSShashank Sharma if (!KFD_IS_SOC15(dev))
2162105a15aSShashank Sharma return 0;
2172105a15aSShashank Sharma
2182105a15aSShashank Sharma /* Mask out doorbells reserved for SDMA, IH, and VCN on SOC15. */
2192105a15aSShashank Sharma pr_debug("reserved doorbell 0x%03x - 0x%03x\n", range_start, range_end);
2202105a15aSShashank Sharma pr_debug("reserved doorbell 0x%03x - 0x%03x\n",
2212105a15aSShashank Sharma range_start + KFD_QUEUE_DOORBELL_MIRROR_OFFSET,
2222105a15aSShashank Sharma range_end + KFD_QUEUE_DOORBELL_MIRROR_OFFSET);
2232105a15aSShashank Sharma
2242105a15aSShashank Sharma for (i = 0; i < KFD_MAX_NUM_OF_QUEUES_PER_PROCESS / 2; i++) {
2252105a15aSShashank Sharma if (i >= range_start && i <= range_end) {
2262105a15aSShashank Sharma __set_bit(i, qpd->doorbell_bitmap);
2272105a15aSShashank Sharma __set_bit(i + KFD_QUEUE_DOORBELL_MIRROR_OFFSET,
2282105a15aSShashank Sharma qpd->doorbell_bitmap);
2292105a15aSShashank Sharma }
2302105a15aSShashank Sharma }
2312105a15aSShashank Sharma
23216f00131SFelix Kuehling return 0;
23316f00131SFelix Kuehling }
23416f00131SFelix Kuehling
kfd_get_process_doorbells(struct kfd_process_device * pdd)2352105a15aSShashank Sharma phys_addr_t kfd_get_process_doorbells(struct kfd_process_device *pdd)
2362105a15aSShashank Sharma {
2372105a15aSShashank Sharma struct amdgpu_device *adev = pdd->dev->adev;
2382105a15aSShashank Sharma uint32_t first_db_index;
2392105a15aSShashank Sharma
2402105a15aSShashank Sharma if (!pdd->qpd.proc_doorbells) {
2412105a15aSShashank Sharma if (kfd_alloc_process_doorbells(pdd->dev->kfd, pdd))
2422105a15aSShashank Sharma /* phys_addr_t 0 is error */
2432105a15aSShashank Sharma return 0;
244a91e70e3SFelix Kuehling }
245a91e70e3SFelix Kuehling
246*45d72eadSArvind Yadav first_db_index = amdgpu_doorbell_index_on_bar(adev,
247*45d72eadSArvind Yadav pdd->qpd.proc_doorbells,
248*45d72eadSArvind Yadav 0,
249*45d72eadSArvind Yadav pdd->dev->kfd->device_info.doorbell_size);
2502105a15aSShashank Sharma return adev->doorbell.base + first_db_index * sizeof(uint32_t);
2512105a15aSShashank Sharma }
2522105a15aSShashank Sharma
kfd_alloc_process_doorbells(struct kfd_dev * kfd,struct kfd_process_device * pdd)2532105a15aSShashank Sharma int kfd_alloc_process_doorbells(struct kfd_dev *kfd, struct kfd_process_device *pdd)
254a91e70e3SFelix Kuehling {
2552105a15aSShashank Sharma int r;
2562105a15aSShashank Sharma struct qcm_process_device *qpd = &pdd->qpd;
257cc009e61SMukul Joshi
2582105a15aSShashank Sharma /* Allocate bitmap for dynamic doorbell allocation */
2592105a15aSShashank Sharma qpd->doorbell_bitmap = bitmap_zalloc(KFD_MAX_NUM_OF_QUEUES_PER_PROCESS,
2602105a15aSShashank Sharma GFP_KERNEL);
2612105a15aSShashank Sharma if (!qpd->doorbell_bitmap) {
2622105a15aSShashank Sharma DRM_ERROR("Failed to allocate process doorbell bitmap\n");
2632105a15aSShashank Sharma return -ENOMEM;
2642105a15aSShashank Sharma }
265cc009e61SMukul Joshi
2662105a15aSShashank Sharma r = init_doorbell_bitmap(&pdd->qpd, kfd);
2672105a15aSShashank Sharma if (r) {
2682105a15aSShashank Sharma DRM_ERROR("Failed to initialize process doorbells\n");
2692105a15aSShashank Sharma r = -ENOMEM;
2702105a15aSShashank Sharma goto err;
2712105a15aSShashank Sharma }
272a91e70e3SFelix Kuehling
2732105a15aSShashank Sharma /* Allocate doorbells for this process */
2742105a15aSShashank Sharma r = amdgpu_bo_create_kernel(kfd->adev,
2752105a15aSShashank Sharma kfd_doorbell_process_slice(kfd),
2762105a15aSShashank Sharma PAGE_SIZE,
2772105a15aSShashank Sharma AMDGPU_GEM_DOMAIN_DOORBELL,
2782105a15aSShashank Sharma &qpd->proc_doorbells,
2792105a15aSShashank Sharma NULL,
2802105a15aSShashank Sharma NULL);
2812105a15aSShashank Sharma if (r) {
2822105a15aSShashank Sharma DRM_ERROR("Failed to allocate process doorbells\n");
2832105a15aSShashank Sharma goto err;
2842105a15aSShashank Sharma }
2852105a15aSShashank Sharma return 0;
286a4a3798fSRajneesh Bhardwaj
2872105a15aSShashank Sharma err:
2882105a15aSShashank Sharma bitmap_free(qpd->doorbell_bitmap);
2892105a15aSShashank Sharma qpd->doorbell_bitmap = NULL;
290a91e70e3SFelix Kuehling return r;
291a91e70e3SFelix Kuehling }
292a91e70e3SFelix Kuehling
kfd_free_process_doorbells(struct kfd_dev * kfd,struct kfd_process_device * pdd)2932105a15aSShashank Sharma void kfd_free_process_doorbells(struct kfd_dev *kfd, struct kfd_process_device *pdd)
294a91e70e3SFelix Kuehling {
2952105a15aSShashank Sharma struct qcm_process_device *qpd = &pdd->qpd;
2962105a15aSShashank Sharma
2972105a15aSShashank Sharma if (qpd->doorbell_bitmap) {
2982105a15aSShashank Sharma bitmap_free(qpd->doorbell_bitmap);
2992105a15aSShashank Sharma qpd->doorbell_bitmap = NULL;
300cc009e61SMukul Joshi }
3012105a15aSShashank Sharma
3022105a15aSShashank Sharma amdgpu_bo_free_kernel(&qpd->proc_doorbells, NULL, NULL);
30319f6d2a6SOded Gabbay }
304