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f204e0b8 IM |
1 | /* |
2 | * Copyright 2014 IBM Corp. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | */ | |
9 | ||
10 | #include <linux/spinlock.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/device.h> | |
14 | #include <linux/mutex.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/list.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/of.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/idr.h> | |
21 | #include <linux/pci.h> | |
22 | #include <asm/cputable.h> | |
ec249dd8 | 23 | #include <misc/cxl-base.h> |
f204e0b8 IM |
24 | |
25 | #include "cxl.h" | |
9bcf28cd | 26 | #include "trace.h" |
f204e0b8 IM |
27 | |
28 | static DEFINE_SPINLOCK(adapter_idr_lock); | |
29 | static DEFINE_IDR(cxl_adapter_idr); | |
30 | ||
31 | uint cxl_verbose; | |
32 | module_param_named(verbose, cxl_verbose, uint, 0600); | |
33 | MODULE_PARM_DESC(verbose, "Enable verbose dmesg output"); | |
34 | ||
5be587b1 FB |
35 | const struct cxl_backend_ops *cxl_ops; |
36 | ||
86331862 CL |
37 | int cxl_afu_slbia(struct cxl_afu *afu) |
38 | { | |
39 | unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT); | |
40 | ||
41 | pr_devel("cxl_afu_slbia issuing SLBIA command\n"); | |
42 | cxl_p2n_write(afu, CXL_SLBIA_An, CXL_TLB_SLB_IQ_ALL); | |
43 | while (cxl_p2n_read(afu, CXL_SLBIA_An) & CXL_TLB_SLB_P) { | |
44 | if (time_after_eq(jiffies, timeout)) { | |
45 | dev_warn(&afu->dev, "WARNING: CXL AFU SLBIA timed out!\n"); | |
46 | return -EBUSY; | |
47 | } | |
48 | /* If the adapter has gone down, we can assume that we | |
49 | * will PERST it and that will invalidate everything. | |
50 | */ | |
0d400f77 | 51 | if (!cxl_ops->link_ok(afu->adapter, afu)) |
86331862 CL |
52 | return -EIO; |
53 | cpu_relax(); | |
54 | } | |
55 | return 0; | |
56 | } | |
57 | ||
f204e0b8 IM |
58 | static inline void _cxl_slbia(struct cxl_context *ctx, struct mm_struct *mm) |
59 | { | |
60 | struct task_struct *task; | |
61 | unsigned long flags; | |
62 | if (!(task = get_pid_task(ctx->pid, PIDTYPE_PID))) { | |
63 | pr_devel("%s unable to get task %i\n", | |
64 | __func__, pid_nr(ctx->pid)); | |
65 | return; | |
66 | } | |
67 | ||
68 | if (task->mm != mm) | |
69 | goto out_put; | |
70 | ||
71 | pr_devel("%s matched mm - card: %i afu: %i pe: %i\n", __func__, | |
72 | ctx->afu->adapter->adapter_num, ctx->afu->slice, ctx->pe); | |
73 | ||
74 | spin_lock_irqsave(&ctx->sste_lock, flags); | |
9bcf28cd | 75 | trace_cxl_slbia(ctx); |
f204e0b8 IM |
76 | memset(ctx->sstp, 0, ctx->sst_size); |
77 | spin_unlock_irqrestore(&ctx->sste_lock, flags); | |
78 | mb(); | |
79 | cxl_afu_slbia(ctx->afu); | |
80 | out_put: | |
81 | put_task_struct(task); | |
82 | } | |
83 | ||
84 | static inline void cxl_slbia_core(struct mm_struct *mm) | |
85 | { | |
86 | struct cxl *adapter; | |
87 | struct cxl_afu *afu; | |
88 | struct cxl_context *ctx; | |
89 | int card, slice, id; | |
90 | ||
91 | pr_devel("%s called\n", __func__); | |
92 | ||
93 | spin_lock(&adapter_idr_lock); | |
94 | idr_for_each_entry(&cxl_adapter_idr, adapter, card) { | |
95 | /* XXX: Make this lookup faster with link from mm to ctx */ | |
96 | spin_lock(&adapter->afu_list_lock); | |
97 | for (slice = 0; slice < adapter->slices; slice++) { | |
98 | afu = adapter->afu[slice]; | |
2c069a11 | 99 | if (!afu || !afu->enabled) |
f204e0b8 IM |
100 | continue; |
101 | rcu_read_lock(); | |
102 | idr_for_each_entry(&afu->contexts_idr, ctx, id) | |
103 | _cxl_slbia(ctx, mm); | |
104 | rcu_read_unlock(); | |
105 | } | |
106 | spin_unlock(&adapter->afu_list_lock); | |
107 | } | |
108 | spin_unlock(&adapter_idr_lock); | |
109 | } | |
110 | ||
111 | static struct cxl_calls cxl_calls = { | |
112 | .cxl_slbia = cxl_slbia_core, | |
113 | .owner = THIS_MODULE, | |
114 | }; | |
115 | ||
116 | int cxl_alloc_sst(struct cxl_context *ctx) | |
117 | { | |
118 | unsigned long vsid; | |
119 | u64 ea_mask, size, sstp0, sstp1; | |
120 | ||
121 | sstp0 = 0; | |
122 | sstp1 = 0; | |
123 | ||
124 | ctx->sst_size = PAGE_SIZE; | |
125 | ctx->sst_lru = 0; | |
126 | ctx->sstp = (struct cxl_sste *)get_zeroed_page(GFP_KERNEL); | |
127 | if (!ctx->sstp) { | |
128 | pr_err("cxl_alloc_sst: Unable to allocate segment table\n"); | |
129 | return -ENOMEM; | |
130 | } | |
131 | pr_devel("SSTP allocated at 0x%p\n", ctx->sstp); | |
132 | ||
133 | vsid = get_kernel_vsid((u64)ctx->sstp, mmu_kernel_ssize) << 12; | |
134 | ||
135 | sstp0 |= (u64)mmu_kernel_ssize << CXL_SSTP0_An_B_SHIFT; | |
136 | sstp0 |= (SLB_VSID_KERNEL | mmu_psize_defs[mmu_linear_psize].sllp) << 50; | |
137 | ||
138 | size = (((u64)ctx->sst_size >> 8) - 1) << CXL_SSTP0_An_SegTableSize_SHIFT; | |
139 | if (unlikely(size & ~CXL_SSTP0_An_SegTableSize_MASK)) { | |
140 | WARN(1, "Impossible segment table size\n"); | |
141 | return -EINVAL; | |
142 | } | |
143 | sstp0 |= size; | |
144 | ||
145 | if (mmu_kernel_ssize == MMU_SEGSIZE_256M) | |
146 | ea_mask = 0xfffff00ULL; | |
147 | else | |
148 | ea_mask = 0xffffffff00ULL; | |
149 | ||
150 | sstp0 |= vsid >> (50-14); /* Top 14 bits of VSID */ | |
151 | sstp1 |= (vsid << (64-(50-14))) & ~ea_mask; | |
152 | sstp1 |= (u64)ctx->sstp & ea_mask; | |
153 | sstp1 |= CXL_SSTP1_An_V; | |
154 | ||
155 | pr_devel("Looked up %#llx: slbfee. %#llx (ssize: %x, vsid: %#lx), copied to SSTP0: %#llx, SSTP1: %#llx\n", | |
156 | (u64)ctx->sstp, (u64)ctx->sstp & ESID_MASK, mmu_kernel_ssize, vsid, sstp0, sstp1); | |
157 | ||
158 | /* Store calculated sstp hardware points for use later */ | |
159 | ctx->sstp0 = sstp0; | |
160 | ctx->sstp1 = sstp1; | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
444c4ba4 CL |
165 | /* print buffer content as integers when debugging */ |
166 | void cxl_dump_debug_buffer(void *buf, size_t buf_len) | |
167 | { | |
168 | #ifdef DEBUG | |
169 | int i, *ptr; | |
170 | ||
171 | /* | |
172 | * We want to regroup up to 4 integers per line, which means they | |
173 | * need to be in the same pr_devel() statement | |
174 | */ | |
175 | ptr = (int *) buf; | |
176 | for (i = 0; i * 4 < buf_len; i += 4) { | |
177 | if ((i + 3) * 4 < buf_len) | |
178 | pr_devel("%.8x %.8x %.8x %.8x\n", ptr[i], ptr[i + 1], | |
179 | ptr[i + 2], ptr[i + 3]); | |
180 | else if ((i + 2) * 4 < buf_len) | |
181 | pr_devel("%.8x %.8x %.8x\n", ptr[i], ptr[i + 1], | |
182 | ptr[i + 2]); | |
183 | else if ((i + 1) * 4 < buf_len) | |
184 | pr_devel("%.8x %.8x\n", ptr[i], ptr[i + 1]); | |
185 | else | |
186 | pr_devel("%.8x\n", ptr[i]); | |
187 | } | |
188 | #endif /* DEBUG */ | |
189 | } | |
190 | ||
f204e0b8 IM |
191 | /* Find a CXL adapter by it's number and increase it's refcount */ |
192 | struct cxl *get_cxl_adapter(int num) | |
193 | { | |
194 | struct cxl *adapter; | |
195 | ||
196 | spin_lock(&adapter_idr_lock); | |
197 | if ((adapter = idr_find(&cxl_adapter_idr, num))) | |
198 | get_device(&adapter->dev); | |
199 | spin_unlock(&adapter_idr_lock); | |
200 | ||
201 | return adapter; | |
202 | } | |
203 | ||
d56d301b | 204 | static int cxl_alloc_adapter_nr(struct cxl *adapter) |
f204e0b8 IM |
205 | { |
206 | int i; | |
207 | ||
208 | idr_preload(GFP_KERNEL); | |
209 | spin_lock(&adapter_idr_lock); | |
210 | i = idr_alloc(&cxl_adapter_idr, adapter, 0, 0, GFP_NOWAIT); | |
211 | spin_unlock(&adapter_idr_lock); | |
212 | idr_preload_end(); | |
213 | if (i < 0) | |
214 | return i; | |
215 | ||
216 | adapter->adapter_num = i; | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | void cxl_remove_adapter_nr(struct cxl *adapter) | |
222 | { | |
223 | idr_remove(&cxl_adapter_idr, adapter->adapter_num); | |
224 | } | |
225 | ||
86331862 CL |
226 | struct cxl *cxl_alloc_adapter(void) |
227 | { | |
228 | struct cxl *adapter; | |
229 | ||
230 | if (!(adapter = kzalloc(sizeof(struct cxl), GFP_KERNEL))) | |
231 | return NULL; | |
232 | ||
233 | spin_lock_init(&adapter->afu_list_lock); | |
234 | ||
235 | if (cxl_alloc_adapter_nr(adapter)) | |
236 | goto err1; | |
237 | ||
238 | if (dev_set_name(&adapter->dev, "card%i", adapter->adapter_num)) | |
239 | goto err2; | |
240 | ||
241 | return adapter; | |
242 | ||
243 | err2: | |
244 | cxl_remove_adapter_nr(adapter); | |
245 | err1: | |
246 | kfree(adapter); | |
247 | return NULL; | |
248 | } | |
249 | ||
250 | struct cxl_afu *cxl_alloc_afu(struct cxl *adapter, int slice) | |
251 | { | |
252 | struct cxl_afu *afu; | |
253 | ||
254 | if (!(afu = kzalloc(sizeof(struct cxl_afu), GFP_KERNEL))) | |
255 | return NULL; | |
256 | ||
257 | afu->adapter = adapter; | |
258 | afu->dev.parent = &adapter->dev; | |
5be587b1 | 259 | afu->dev.release = cxl_ops->release_afu; |
86331862 CL |
260 | afu->slice = slice; |
261 | idr_init(&afu->contexts_idr); | |
262 | mutex_init(&afu->contexts_lock); | |
263 | spin_lock_init(&afu->afu_cntl_lock); | |
86331862 CL |
264 | |
265 | afu->prefault_mode = CXL_PREFAULT_NONE; | |
266 | afu->irqs_max = afu->adapter->user_irqs; | |
267 | ||
268 | return afu; | |
269 | } | |
270 | ||
f204e0b8 IM |
271 | int cxl_afu_select_best_mode(struct cxl_afu *afu) |
272 | { | |
273 | if (afu->modes_supported & CXL_MODE_DIRECTED) | |
5be587b1 | 274 | return cxl_ops->afu_activate_mode(afu, CXL_MODE_DIRECTED); |
f204e0b8 IM |
275 | |
276 | if (afu->modes_supported & CXL_MODE_DEDICATED) | |
5be587b1 | 277 | return cxl_ops->afu_activate_mode(afu, CXL_MODE_DEDICATED); |
f204e0b8 IM |
278 | |
279 | dev_warn(&afu->dev, "No supported programming modes available\n"); | |
280 | /* We don't fail this so the user can inspect sysfs */ | |
281 | return 0; | |
282 | } | |
283 | ||
284 | static int __init init_cxl(void) | |
285 | { | |
286 | int rc = 0; | |
287 | ||
f204e0b8 IM |
288 | if ((rc = cxl_file_init())) |
289 | return rc; | |
290 | ||
291 | cxl_debugfs_init(); | |
292 | ||
293 | if ((rc = register_cxl_calls(&cxl_calls))) | |
294 | goto err; | |
295 | ||
14baf4d9 CL |
296 | if (cpu_has_feature(CPU_FTR_HVMODE)) { |
297 | cxl_ops = &cxl_native_ops; | |
298 | rc = pci_register_driver(&cxl_pci_driver); | |
299 | } | |
300 | #ifdef CONFIG_PPC_PSERIES | |
301 | else { | |
302 | cxl_ops = &cxl_guest_ops; | |
303 | rc = platform_driver_register(&cxl_of_driver); | |
304 | } | |
305 | #endif | |
306 | if (rc) | |
f204e0b8 IM |
307 | goto err1; |
308 | ||
309 | return 0; | |
310 | err1: | |
311 | unregister_cxl_calls(&cxl_calls); | |
312 | err: | |
313 | cxl_debugfs_exit(); | |
314 | cxl_file_exit(); | |
315 | ||
316 | return rc; | |
317 | } | |
318 | ||
319 | static void exit_cxl(void) | |
320 | { | |
14baf4d9 CL |
321 | if (cpu_has_feature(CPU_FTR_HVMODE)) |
322 | pci_unregister_driver(&cxl_pci_driver); | |
323 | #ifdef CONFIG_PPC_PSERIES | |
324 | else | |
325 | platform_driver_unregister(&cxl_of_driver); | |
326 | #endif | |
f204e0b8 IM |
327 | |
328 | cxl_debugfs_exit(); | |
329 | cxl_file_exit(); | |
330 | unregister_cxl_calls(&cxl_calls); | |
b2a02ac6 | 331 | idr_destroy(&cxl_adapter_idr); |
f204e0b8 IM |
332 | } |
333 | ||
334 | module_init(init_cxl); | |
335 | module_exit(exit_cxl); | |
336 | ||
337 | MODULE_DESCRIPTION("IBM Coherent Accelerator"); | |
338 | MODULE_AUTHOR("Ian Munsie <imunsie@au1.ibm.com>"); | |
339 | MODULE_LICENSE("GPL"); |