This source file includes following definitions.
- ocxl_context_alloc
- xsl_fault_error
- ocxl_context_attach
- map_afu_irq
- map_pp_mmio
- ocxl_mmap_fault
- check_mmap_afu_irq
- check_mmap_mmio
- ocxl_context_mmap
- ocxl_context_detach
- ocxl_context_detach_all
- ocxl_context_free
1
2
3 #include <linux/sched/mm.h>
4 #include "trace.h"
5 #include "ocxl_internal.h"
6
7 int ocxl_context_alloc(struct ocxl_context **context, struct ocxl_afu *afu,
8 struct address_space *mapping)
9 {
10 int pasid;
11 struct ocxl_context *ctx;
12
13 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
14 if (!ctx)
15 return -ENOMEM;
16
17 ctx->afu = afu;
18 mutex_lock(&afu->contexts_lock);
19 pasid = idr_alloc(&afu->contexts_idr, ctx, afu->pasid_base,
20 afu->pasid_base + afu->pasid_max, GFP_KERNEL);
21 if (pasid < 0) {
22 mutex_unlock(&afu->contexts_lock);
23 kfree(ctx);
24 return pasid;
25 }
26 afu->pasid_count++;
27 mutex_unlock(&afu->contexts_lock);
28
29 ctx->pasid = pasid;
30 ctx->status = OPENED;
31 mutex_init(&ctx->status_mutex);
32 ctx->mapping = mapping;
33 mutex_init(&ctx->mapping_lock);
34 init_waitqueue_head(&ctx->events_wq);
35 mutex_init(&ctx->xsl_error_lock);
36 mutex_init(&ctx->irq_lock);
37 idr_init(&ctx->irq_idr);
38 ctx->tidr = 0;
39
40
41
42
43
44 ocxl_afu_get(afu);
45 *context = ctx;
46 return 0;
47 }
48 EXPORT_SYMBOL_GPL(ocxl_context_alloc);
49
50
51
52
53
54
55
56 static void xsl_fault_error(void *data, u64 addr, u64 dsisr)
57 {
58 struct ocxl_context *ctx = (struct ocxl_context *) data;
59
60 mutex_lock(&ctx->xsl_error_lock);
61 ctx->xsl_error.addr = addr;
62 ctx->xsl_error.dsisr = dsisr;
63 ctx->xsl_error.count++;
64 mutex_unlock(&ctx->xsl_error_lock);
65
66 wake_up_all(&ctx->events_wq);
67 }
68
69 int ocxl_context_attach(struct ocxl_context *ctx, u64 amr, struct mm_struct *mm)
70 {
71 int rc;
72 unsigned long pidr = 0;
73
74
75 mutex_lock(&ctx->status_mutex);
76 if (ctx->status != OPENED) {
77 rc = -EIO;
78 goto out;
79 }
80
81 if (mm)
82 pidr = mm->context.id;
83
84 rc = ocxl_link_add_pe(ctx->afu->fn->link, ctx->pasid, pidr, ctx->tidr,
85 amr, mm, xsl_fault_error, ctx);
86 if (rc)
87 goto out;
88
89 ctx->status = ATTACHED;
90 out:
91 mutex_unlock(&ctx->status_mutex);
92 return rc;
93 }
94 EXPORT_SYMBOL_GPL(ocxl_context_attach);
95
96 static vm_fault_t map_afu_irq(struct vm_area_struct *vma, unsigned long address,
97 u64 offset, struct ocxl_context *ctx)
98 {
99 u64 trigger_addr;
100 int irq_id = ocxl_irq_offset_to_id(ctx, offset);
101
102 trigger_addr = ocxl_afu_irq_get_addr(ctx, irq_id);
103 if (!trigger_addr)
104 return VM_FAULT_SIGBUS;
105
106 return vmf_insert_pfn(vma, address, trigger_addr >> PAGE_SHIFT);
107 }
108
109 static vm_fault_t map_pp_mmio(struct vm_area_struct *vma, unsigned long address,
110 u64 offset, struct ocxl_context *ctx)
111 {
112 u64 pp_mmio_addr;
113 int pasid_off;
114 vm_fault_t ret;
115
116 if (offset >= ctx->afu->config.pp_mmio_stride)
117 return VM_FAULT_SIGBUS;
118
119 mutex_lock(&ctx->status_mutex);
120 if (ctx->status != ATTACHED) {
121 mutex_unlock(&ctx->status_mutex);
122 pr_debug("%s: Context not attached, failing mmio mmap\n",
123 __func__);
124 return VM_FAULT_SIGBUS;
125 }
126
127 pasid_off = ctx->pasid - ctx->afu->pasid_base;
128 pp_mmio_addr = ctx->afu->pp_mmio_start +
129 pasid_off * ctx->afu->config.pp_mmio_stride +
130 offset;
131
132 ret = vmf_insert_pfn(vma, address, pp_mmio_addr >> PAGE_SHIFT);
133 mutex_unlock(&ctx->status_mutex);
134 return ret;
135 }
136
137 static vm_fault_t ocxl_mmap_fault(struct vm_fault *vmf)
138 {
139 struct vm_area_struct *vma = vmf->vma;
140 struct ocxl_context *ctx = vma->vm_file->private_data;
141 u64 offset;
142 vm_fault_t ret;
143
144 offset = vmf->pgoff << PAGE_SHIFT;
145 pr_debug("%s: pasid %d address 0x%lx offset 0x%llx\n", __func__,
146 ctx->pasid, vmf->address, offset);
147
148 if (offset < ctx->afu->irq_base_offset)
149 ret = map_pp_mmio(vma, vmf->address, offset, ctx);
150 else
151 ret = map_afu_irq(vma, vmf->address, offset, ctx);
152 return ret;
153 }
154
155 static const struct vm_operations_struct ocxl_vmops = {
156 .fault = ocxl_mmap_fault,
157 };
158
159 static int check_mmap_afu_irq(struct ocxl_context *ctx,
160 struct vm_area_struct *vma)
161 {
162 int irq_id = ocxl_irq_offset_to_id(ctx, vma->vm_pgoff << PAGE_SHIFT);
163
164
165 if (vma_pages(vma) != 1)
166 return -EINVAL;
167
168
169 if (!ocxl_afu_irq_get_addr(ctx, irq_id))
170 return -EINVAL;
171
172
173
174
175
176
177
178 if ((vma->vm_flags & VM_READ) || (vma->vm_flags & VM_EXEC) ||
179 !(vma->vm_flags & VM_WRITE))
180 return -EINVAL;
181 vma->vm_flags &= ~(VM_MAYREAD | VM_MAYEXEC);
182 return 0;
183 }
184
185 static int check_mmap_mmio(struct ocxl_context *ctx,
186 struct vm_area_struct *vma)
187 {
188 if ((vma_pages(vma) + vma->vm_pgoff) >
189 (ctx->afu->config.pp_mmio_stride >> PAGE_SHIFT))
190 return -EINVAL;
191 return 0;
192 }
193
194 int ocxl_context_mmap(struct ocxl_context *ctx, struct vm_area_struct *vma)
195 {
196 int rc;
197
198 if ((vma->vm_pgoff << PAGE_SHIFT) < ctx->afu->irq_base_offset)
199 rc = check_mmap_mmio(ctx, vma);
200 else
201 rc = check_mmap_afu_irq(ctx, vma);
202 if (rc)
203 return rc;
204
205 vma->vm_flags |= VM_IO | VM_PFNMAP;
206 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
207 vma->vm_ops = &ocxl_vmops;
208 return 0;
209 }
210
211 int ocxl_context_detach(struct ocxl_context *ctx)
212 {
213 struct pci_dev *dev;
214 int afu_control_pos;
215 enum ocxl_context_status status;
216 int rc;
217
218 mutex_lock(&ctx->status_mutex);
219 status = ctx->status;
220 ctx->status = CLOSED;
221 mutex_unlock(&ctx->status_mutex);
222 if (status != ATTACHED)
223 return 0;
224
225 dev = to_pci_dev(ctx->afu->fn->dev.parent);
226 afu_control_pos = ctx->afu->config.dvsec_afu_control_pos;
227
228 mutex_lock(&ctx->afu->afu_control_lock);
229 rc = ocxl_config_terminate_pasid(dev, afu_control_pos, ctx->pasid);
230 mutex_unlock(&ctx->afu->afu_control_lock);
231 trace_ocxl_terminate_pasid(ctx->pasid, rc);
232 if (rc) {
233
234
235
236
237
238
239
240
241
242
243
244
245
246 if (rc == -EBUSY)
247 return rc;
248 }
249 rc = ocxl_link_remove_pe(ctx->afu->fn->link, ctx->pasid);
250 if (rc) {
251 dev_warn(&dev->dev,
252 "Couldn't remove PE entry cleanly: %d\n", rc);
253 }
254 return 0;
255 }
256 EXPORT_SYMBOL_GPL(ocxl_context_detach);
257
258 void ocxl_context_detach_all(struct ocxl_afu *afu)
259 {
260 struct ocxl_context *ctx;
261 int tmp;
262
263 mutex_lock(&afu->contexts_lock);
264 idr_for_each_entry(&afu->contexts_idr, ctx, tmp) {
265 ocxl_context_detach(ctx);
266
267
268
269
270
271
272
273 mutex_lock(&ctx->mapping_lock);
274 if (ctx->mapping)
275 unmap_mapping_range(ctx->mapping, 0, 0, 1);
276 mutex_unlock(&ctx->mapping_lock);
277 }
278 mutex_unlock(&afu->contexts_lock);
279 }
280
281 void ocxl_context_free(struct ocxl_context *ctx)
282 {
283 mutex_lock(&ctx->afu->contexts_lock);
284 ctx->afu->pasid_count--;
285 idr_remove(&ctx->afu->contexts_idr, ctx->pasid);
286 mutex_unlock(&ctx->afu->contexts_lock);
287
288 ocxl_afu_irq_free_all(ctx);
289 idr_destroy(&ctx->irq_idr);
290
291 ocxl_afu_put(ctx->afu);
292 kfree(ctx);
293 }
294 EXPORT_SYMBOL_GPL(ocxl_context_free);