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Commit | Line | Data |
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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/sched.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/sched.h> | |
14 | #include <linux/mutex.h> | |
15 | #include <linux/mm.h> | |
16 | #include <linux/uaccess.h> | |
17 | #include <asm/synch.h> | |
ec249dd8 | 18 | #include <misc/cxl-base.h> |
f204e0b8 IM |
19 | |
20 | #include "cxl.h" | |
9bcf28cd | 21 | #include "trace.h" |
f204e0b8 IM |
22 | |
23 | static int afu_control(struct cxl_afu *afu, u64 command, | |
24 | u64 result, u64 mask, bool enabled) | |
25 | { | |
26 | u64 AFU_Cntl = cxl_p2n_read(afu, CXL_AFU_Cntl_An); | |
27 | unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT); | |
9bcf28cd | 28 | int rc = 0; |
f204e0b8 IM |
29 | |
30 | spin_lock(&afu->afu_cntl_lock); | |
31 | pr_devel("AFU command starting: %llx\n", command); | |
32 | ||
9bcf28cd IM |
33 | trace_cxl_afu_ctrl(afu, command); |
34 | ||
f204e0b8 IM |
35 | cxl_p2n_write(afu, CXL_AFU_Cntl_An, AFU_Cntl | command); |
36 | ||
37 | AFU_Cntl = cxl_p2n_read(afu, CXL_AFU_Cntl_An); | |
38 | while ((AFU_Cntl & mask) != result) { | |
39 | if (time_after_eq(jiffies, timeout)) { | |
40 | dev_warn(&afu->dev, "WARNING: AFU control timed out!\n"); | |
9bcf28cd IM |
41 | rc = -EBUSY; |
42 | goto out; | |
f204e0b8 | 43 | } |
0b3f9c75 DA |
44 | |
45 | if (!cxl_adapter_link_ok(afu->adapter)) { | |
46 | afu->enabled = enabled; | |
47 | rc = -EIO; | |
48 | goto out; | |
49 | } | |
50 | ||
de369538 | 51 | pr_devel_ratelimited("AFU control... (0x%016llx)\n", |
f204e0b8 IM |
52 | AFU_Cntl | command); |
53 | cpu_relax(); | |
54 | AFU_Cntl = cxl_p2n_read(afu, CXL_AFU_Cntl_An); | |
55 | }; | |
56 | pr_devel("AFU command complete: %llx\n", command); | |
57 | afu->enabled = enabled; | |
9bcf28cd IM |
58 | out: |
59 | trace_cxl_afu_ctrl_done(afu, command, rc); | |
f204e0b8 IM |
60 | spin_unlock(&afu->afu_cntl_lock); |
61 | ||
9bcf28cd | 62 | return rc; |
f204e0b8 IM |
63 | } |
64 | ||
65 | static int afu_enable(struct cxl_afu *afu) | |
66 | { | |
67 | pr_devel("AFU enable request\n"); | |
68 | ||
69 | return afu_control(afu, CXL_AFU_Cntl_An_E, | |
70 | CXL_AFU_Cntl_An_ES_Enabled, | |
71 | CXL_AFU_Cntl_An_ES_MASK, true); | |
72 | } | |
73 | ||
74 | int cxl_afu_disable(struct cxl_afu *afu) | |
75 | { | |
76 | pr_devel("AFU disable request\n"); | |
77 | ||
78 | return afu_control(afu, 0, CXL_AFU_Cntl_An_ES_Disabled, | |
79 | CXL_AFU_Cntl_An_ES_MASK, false); | |
80 | } | |
81 | ||
82 | /* This will disable as well as reset */ | |
b12994fb | 83 | int __cxl_afu_reset(struct cxl_afu *afu) |
f204e0b8 IM |
84 | { |
85 | pr_devel("AFU reset request\n"); | |
86 | ||
87 | return afu_control(afu, CXL_AFU_Cntl_An_RA, | |
88 | CXL_AFU_Cntl_An_RS_Complete | CXL_AFU_Cntl_An_ES_Disabled, | |
89 | CXL_AFU_Cntl_An_RS_MASK | CXL_AFU_Cntl_An_ES_MASK, | |
90 | false); | |
91 | } | |
92 | ||
1a1a94b8 | 93 | int cxl_afu_check_and_enable(struct cxl_afu *afu) |
f204e0b8 | 94 | { |
0b3f9c75 DA |
95 | if (!cxl_adapter_link_ok(afu->adapter)) { |
96 | WARN(1, "Refusing to enable afu while link down!\n"); | |
97 | return -EIO; | |
98 | } | |
f204e0b8 IM |
99 | if (afu->enabled) |
100 | return 0; | |
101 | return afu_enable(afu); | |
102 | } | |
103 | ||
104 | int cxl_psl_purge(struct cxl_afu *afu) | |
105 | { | |
106 | u64 PSL_CNTL = cxl_p1n_read(afu, CXL_PSL_SCNTL_An); | |
107 | u64 AFU_Cntl = cxl_p2n_read(afu, CXL_AFU_Cntl_An); | |
108 | u64 dsisr, dar; | |
109 | u64 start, end; | |
110 | unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT); | |
9bcf28cd IM |
111 | int rc = 0; |
112 | ||
113 | trace_cxl_psl_ctrl(afu, CXL_PSL_SCNTL_An_Pc); | |
f204e0b8 IM |
114 | |
115 | pr_devel("PSL purge request\n"); | |
116 | ||
0b3f9c75 DA |
117 | if (!cxl_adapter_link_ok(afu->adapter)) { |
118 | dev_warn(&afu->dev, "PSL Purge called with link down, ignoring\n"); | |
119 | rc = -EIO; | |
120 | goto out; | |
121 | } | |
122 | ||
f204e0b8 IM |
123 | if ((AFU_Cntl & CXL_AFU_Cntl_An_ES_MASK) != CXL_AFU_Cntl_An_ES_Disabled) { |
124 | WARN(1, "psl_purge request while AFU not disabled!\n"); | |
125 | cxl_afu_disable(afu); | |
126 | } | |
127 | ||
128 | cxl_p1n_write(afu, CXL_PSL_SCNTL_An, | |
129 | PSL_CNTL | CXL_PSL_SCNTL_An_Pc); | |
130 | start = local_clock(); | |
131 | PSL_CNTL = cxl_p1n_read(afu, CXL_PSL_SCNTL_An); | |
132 | while ((PSL_CNTL & CXL_PSL_SCNTL_An_Ps_MASK) | |
133 | == CXL_PSL_SCNTL_An_Ps_Pending) { | |
134 | if (time_after_eq(jiffies, timeout)) { | |
135 | dev_warn(&afu->dev, "WARNING: PSL Purge timed out!\n"); | |
9bcf28cd IM |
136 | rc = -EBUSY; |
137 | goto out; | |
f204e0b8 | 138 | } |
0b3f9c75 DA |
139 | if (!cxl_adapter_link_ok(afu->adapter)) { |
140 | rc = -EIO; | |
141 | goto out; | |
142 | } | |
143 | ||
f204e0b8 | 144 | dsisr = cxl_p2n_read(afu, CXL_PSL_DSISR_An); |
de369538 | 145 | pr_devel_ratelimited("PSL purging... PSL_CNTL: 0x%016llx PSL_DSISR: 0x%016llx\n", PSL_CNTL, dsisr); |
f204e0b8 IM |
146 | if (dsisr & CXL_PSL_DSISR_TRANS) { |
147 | dar = cxl_p2n_read(afu, CXL_PSL_DAR_An); | |
de369538 | 148 | dev_notice(&afu->dev, "PSL purge terminating pending translation, DSISR: 0x%016llx, DAR: 0x%016llx\n", dsisr, dar); |
f204e0b8 IM |
149 | cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_AE); |
150 | } else if (dsisr) { | |
de369538 | 151 | dev_notice(&afu->dev, "PSL purge acknowledging pending non-translation fault, DSISR: 0x%016llx\n", dsisr); |
f204e0b8 IM |
152 | cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_A); |
153 | } else { | |
154 | cpu_relax(); | |
155 | } | |
156 | PSL_CNTL = cxl_p1n_read(afu, CXL_PSL_SCNTL_An); | |
157 | }; | |
158 | end = local_clock(); | |
159 | pr_devel("PSL purged in %lld ns\n", end - start); | |
160 | ||
161 | cxl_p1n_write(afu, CXL_PSL_SCNTL_An, | |
162 | PSL_CNTL & ~CXL_PSL_SCNTL_An_Pc); | |
9bcf28cd IM |
163 | out: |
164 | trace_cxl_psl_ctrl_done(afu, CXL_PSL_SCNTL_An_Pc, rc); | |
165 | return rc; | |
f204e0b8 IM |
166 | } |
167 | ||
168 | static int spa_max_procs(int spa_size) | |
169 | { | |
170 | /* | |
171 | * From the CAIA: | |
172 | * end_of_SPA_area = SPA_Base + ((n+4) * 128) + (( ((n*8) + 127) >> 7) * 128) + 255 | |
173 | * Most of that junk is really just an overly-complicated way of saying | |
174 | * the last 256 bytes are __aligned(128), so it's really: | |
175 | * end_of_SPA_area = end_of_PSL_queue_area + __aligned(128) 255 | |
176 | * and | |
177 | * end_of_PSL_queue_area = SPA_Base + ((n+4) * 128) + (n*8) - 1 | |
178 | * so | |
179 | * sizeof(SPA) = ((n+4) * 128) + (n*8) + __aligned(128) 256 | |
180 | * Ignore the alignment (which is safe in this case as long as we are | |
181 | * careful with our rounding) and solve for n: | |
182 | */ | |
183 | return ((spa_size / 8) - 96) / 17; | |
184 | } | |
185 | ||
05155772 | 186 | int cxl_alloc_spa(struct cxl_afu *afu) |
f204e0b8 | 187 | { |
f204e0b8 IM |
188 | /* Work out how many pages to allocate */ |
189 | afu->spa_order = 0; | |
190 | do { | |
191 | afu->spa_order++; | |
192 | afu->spa_size = (1 << afu->spa_order) * PAGE_SIZE; | |
193 | afu->spa_max_procs = spa_max_procs(afu->spa_size); | |
194 | } while (afu->spa_max_procs < afu->num_procs); | |
195 | ||
196 | WARN_ON(afu->spa_size > 0x100000); /* Max size supported by the hardware */ | |
197 | ||
198 | if (!(afu->spa = (struct cxl_process_element *) | |
199 | __get_free_pages(GFP_KERNEL | __GFP_ZERO, afu->spa_order))) { | |
200 | pr_err("cxl_alloc_spa: Unable to allocate scheduled process area\n"); | |
201 | return -ENOMEM; | |
202 | } | |
203 | pr_devel("spa pages: %i afu->spa_max_procs: %i afu->num_procs: %i\n", | |
204 | 1<<afu->spa_order, afu->spa_max_procs, afu->num_procs); | |
205 | ||
05155772 DA |
206 | return 0; |
207 | } | |
208 | ||
209 | static void attach_spa(struct cxl_afu *afu) | |
210 | { | |
211 | u64 spap; | |
212 | ||
f204e0b8 IM |
213 | afu->sw_command_status = (__be64 *)((char *)afu->spa + |
214 | ((afu->spa_max_procs + 3) * 128)); | |
215 | ||
216 | spap = virt_to_phys(afu->spa) & CXL_PSL_SPAP_Addr; | |
217 | spap |= ((afu->spa_size >> (12 - CXL_PSL_SPAP_Size_Shift)) - 1) & CXL_PSL_SPAP_Size; | |
218 | spap |= CXL_PSL_SPAP_V; | |
219 | pr_devel("cxl: SPA allocated at 0x%p. Max processes: %i, sw_command_status: 0x%p CXL_PSL_SPAP_An=0x%016llx\n", afu->spa, afu->spa_max_procs, afu->sw_command_status, spap); | |
220 | cxl_p1n_write(afu, CXL_PSL_SPAP_An, spap); | |
f204e0b8 IM |
221 | } |
222 | ||
05155772 | 223 | static inline void detach_spa(struct cxl_afu *afu) |
f204e0b8 | 224 | { |
db7933f3 | 225 | cxl_p1n_write(afu, CXL_PSL_SPAP_An, 0); |
05155772 DA |
226 | } |
227 | ||
228 | void cxl_release_spa(struct cxl_afu *afu) | |
229 | { | |
230 | if (afu->spa) { | |
231 | free_pages((unsigned long) afu->spa, afu->spa_order); | |
232 | afu->spa = NULL; | |
233 | } | |
f204e0b8 IM |
234 | } |
235 | ||
236 | int cxl_tlb_slb_invalidate(struct cxl *adapter) | |
237 | { | |
238 | unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT); | |
239 | ||
240 | pr_devel("CXL adapter wide TLBIA & SLBIA\n"); | |
241 | ||
242 | cxl_p1_write(adapter, CXL_PSL_AFUSEL, CXL_PSL_AFUSEL_A); | |
243 | ||
244 | cxl_p1_write(adapter, CXL_PSL_TLBIA, CXL_TLB_SLB_IQ_ALL); | |
245 | while (cxl_p1_read(adapter, CXL_PSL_TLBIA) & CXL_TLB_SLB_P) { | |
246 | if (time_after_eq(jiffies, timeout)) { | |
247 | dev_warn(&adapter->dev, "WARNING: CXL adapter wide TLBIA timed out!\n"); | |
248 | return -EBUSY; | |
249 | } | |
0b3f9c75 DA |
250 | if (!cxl_adapter_link_ok(adapter)) |
251 | return -EIO; | |
f204e0b8 IM |
252 | cpu_relax(); |
253 | } | |
254 | ||
255 | cxl_p1_write(adapter, CXL_PSL_SLBIA, CXL_TLB_SLB_IQ_ALL); | |
256 | while (cxl_p1_read(adapter, CXL_PSL_SLBIA) & CXL_TLB_SLB_P) { | |
257 | if (time_after_eq(jiffies, timeout)) { | |
258 | dev_warn(&adapter->dev, "WARNING: CXL adapter wide SLBIA timed out!\n"); | |
259 | return -EBUSY; | |
260 | } | |
0b3f9c75 DA |
261 | if (!cxl_adapter_link_ok(adapter)) |
262 | return -EIO; | |
f204e0b8 IM |
263 | cpu_relax(); |
264 | } | |
265 | return 0; | |
266 | } | |
267 | ||
268 | int cxl_afu_slbia(struct cxl_afu *afu) | |
269 | { | |
270 | unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT); | |
271 | ||
272 | pr_devel("cxl_afu_slbia issuing SLBIA command\n"); | |
273 | cxl_p2n_write(afu, CXL_SLBIA_An, CXL_TLB_SLB_IQ_ALL); | |
274 | while (cxl_p2n_read(afu, CXL_SLBIA_An) & CXL_TLB_SLB_P) { | |
275 | if (time_after_eq(jiffies, timeout)) { | |
276 | dev_warn(&afu->dev, "WARNING: CXL AFU SLBIA timed out!\n"); | |
277 | return -EBUSY; | |
278 | } | |
0b3f9c75 DA |
279 | /* If the adapter has gone down, we can assume that we |
280 | * will PERST it and that will invalidate everything. | |
281 | */ | |
282 | if (!cxl_adapter_link_ok(afu->adapter)) | |
283 | return -EIO; | |
f204e0b8 IM |
284 | cpu_relax(); |
285 | } | |
286 | return 0; | |
287 | } | |
288 | ||
289 | static int cxl_write_sstp(struct cxl_afu *afu, u64 sstp0, u64 sstp1) | |
290 | { | |
291 | int rc; | |
292 | ||
293 | /* 1. Disable SSTP by writing 0 to SSTP1[V] */ | |
294 | cxl_p2n_write(afu, CXL_SSTP1_An, 0); | |
295 | ||
296 | /* 2. Invalidate all SLB entries */ | |
297 | if ((rc = cxl_afu_slbia(afu))) | |
298 | return rc; | |
299 | ||
300 | /* 3. Set SSTP0_An */ | |
301 | cxl_p2n_write(afu, CXL_SSTP0_An, sstp0); | |
302 | ||
303 | /* 4. Set SSTP1_An */ | |
304 | cxl_p2n_write(afu, CXL_SSTP1_An, sstp1); | |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
309 | /* Using per slice version may improve performance here. (ie. SLBIA_An) */ | |
310 | static void slb_invalid(struct cxl_context *ctx) | |
311 | { | |
312 | struct cxl *adapter = ctx->afu->adapter; | |
313 | u64 slbia; | |
314 | ||
315 | WARN_ON(!mutex_is_locked(&ctx->afu->spa_mutex)); | |
316 | ||
317 | cxl_p1_write(adapter, CXL_PSL_LBISEL, | |
318 | ((u64)be32_to_cpu(ctx->elem->common.pid) << 32) | | |
319 | be32_to_cpu(ctx->elem->lpid)); | |
320 | cxl_p1_write(adapter, CXL_PSL_SLBIA, CXL_TLB_SLB_IQ_LPIDPID); | |
321 | ||
322 | while (1) { | |
0b3f9c75 DA |
323 | if (!cxl_adapter_link_ok(adapter)) |
324 | break; | |
f204e0b8 IM |
325 | slbia = cxl_p1_read(adapter, CXL_PSL_SLBIA); |
326 | if (!(slbia & CXL_TLB_SLB_P)) | |
327 | break; | |
328 | cpu_relax(); | |
329 | } | |
330 | } | |
331 | ||
332 | static int do_process_element_cmd(struct cxl_context *ctx, | |
333 | u64 cmd, u64 pe_state) | |
334 | { | |
335 | u64 state; | |
a98e6e9f | 336 | unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT); |
9bcf28cd IM |
337 | int rc = 0; |
338 | ||
339 | trace_cxl_llcmd(ctx, cmd); | |
f204e0b8 IM |
340 | |
341 | WARN_ON(!ctx->afu->enabled); | |
342 | ||
343 | ctx->elem->software_state = cpu_to_be32(pe_state); | |
344 | smp_wmb(); | |
345 | *(ctx->afu->sw_command_status) = cpu_to_be64(cmd | 0 | ctx->pe); | |
346 | smp_mb(); | |
347 | cxl_p1n_write(ctx->afu, CXL_PSL_LLCMD_An, cmd | ctx->pe); | |
348 | while (1) { | |
a98e6e9f IM |
349 | if (time_after_eq(jiffies, timeout)) { |
350 | dev_warn(&ctx->afu->dev, "WARNING: Process Element Command timed out!\n"); | |
9bcf28cd IM |
351 | rc = -EBUSY; |
352 | goto out; | |
a98e6e9f | 353 | } |
0b3f9c75 DA |
354 | if (!cxl_adapter_link_ok(ctx->afu->adapter)) { |
355 | dev_warn(&ctx->afu->dev, "WARNING: Device link down, aborting Process Element Command!\n"); | |
356 | rc = -EIO; | |
357 | goto out; | |
358 | } | |
f204e0b8 IM |
359 | state = be64_to_cpup(ctx->afu->sw_command_status); |
360 | if (state == ~0ULL) { | |
361 | pr_err("cxl: Error adding process element to AFU\n"); | |
9bcf28cd IM |
362 | rc = -1; |
363 | goto out; | |
f204e0b8 IM |
364 | } |
365 | if ((state & (CXL_SPA_SW_CMD_MASK | CXL_SPA_SW_STATE_MASK | CXL_SPA_SW_LINK_MASK)) == | |
366 | (cmd | (cmd >> 16) | ctx->pe)) | |
367 | break; | |
368 | /* | |
369 | * The command won't finish in the PSL if there are | |
370 | * outstanding DSIs. Hence we need to yield here in | |
371 | * case there are outstanding DSIs that we need to | |
372 | * service. Tuning possiblity: we could wait for a | |
373 | * while before sched | |
374 | */ | |
375 | schedule(); | |
376 | ||
377 | } | |
9bcf28cd IM |
378 | out: |
379 | trace_cxl_llcmd_done(ctx, cmd, rc); | |
380 | return rc; | |
f204e0b8 IM |
381 | } |
382 | ||
383 | static int add_process_element(struct cxl_context *ctx) | |
384 | { | |
385 | int rc = 0; | |
386 | ||
387 | mutex_lock(&ctx->afu->spa_mutex); | |
388 | pr_devel("%s Adding pe: %i started\n", __func__, ctx->pe); | |
389 | if (!(rc = do_process_element_cmd(ctx, CXL_SPA_SW_CMD_ADD, CXL_PE_SOFTWARE_STATE_V))) | |
390 | ctx->pe_inserted = true; | |
391 | pr_devel("%s Adding pe: %i finished\n", __func__, ctx->pe); | |
392 | mutex_unlock(&ctx->afu->spa_mutex); | |
393 | return rc; | |
394 | } | |
395 | ||
396 | static int terminate_process_element(struct cxl_context *ctx) | |
397 | { | |
398 | int rc = 0; | |
399 | ||
400 | /* fast path terminate if it's already invalid */ | |
401 | if (!(ctx->elem->software_state & cpu_to_be32(CXL_PE_SOFTWARE_STATE_V))) | |
402 | return rc; | |
403 | ||
404 | mutex_lock(&ctx->afu->spa_mutex); | |
405 | pr_devel("%s Terminate pe: %i started\n", __func__, ctx->pe); | |
0b3f9c75 DA |
406 | /* We could be asked to terminate when the hw is down. That |
407 | * should always succeed: it's not running if the hw has gone | |
408 | * away and is being reset. | |
409 | */ | |
410 | if (cxl_adapter_link_ok(ctx->afu->adapter)) | |
411 | rc = do_process_element_cmd(ctx, CXL_SPA_SW_CMD_TERMINATE, | |
412 | CXL_PE_SOFTWARE_STATE_V | CXL_PE_SOFTWARE_STATE_T); | |
f204e0b8 IM |
413 | ctx->elem->software_state = 0; /* Remove Valid bit */ |
414 | pr_devel("%s Terminate pe: %i finished\n", __func__, ctx->pe); | |
415 | mutex_unlock(&ctx->afu->spa_mutex); | |
416 | return rc; | |
417 | } | |
418 | ||
419 | static int remove_process_element(struct cxl_context *ctx) | |
420 | { | |
421 | int rc = 0; | |
422 | ||
423 | mutex_lock(&ctx->afu->spa_mutex); | |
424 | pr_devel("%s Remove pe: %i started\n", __func__, ctx->pe); | |
0b3f9c75 DA |
425 | |
426 | /* We could be asked to remove when the hw is down. Again, if | |
427 | * the hw is down, the PE is gone, so we succeed. | |
428 | */ | |
429 | if (cxl_adapter_link_ok(ctx->afu->adapter)) | |
430 | rc = do_process_element_cmd(ctx, CXL_SPA_SW_CMD_REMOVE, 0); | |
431 | ||
432 | if (!rc) | |
f204e0b8 IM |
433 | ctx->pe_inserted = false; |
434 | slb_invalid(ctx); | |
435 | pr_devel("%s Remove pe: %i finished\n", __func__, ctx->pe); | |
436 | mutex_unlock(&ctx->afu->spa_mutex); | |
437 | ||
438 | return rc; | |
439 | } | |
440 | ||
441 | ||
1a1a94b8 | 442 | void cxl_assign_psn_space(struct cxl_context *ctx) |
f204e0b8 IM |
443 | { |
444 | if (!ctx->afu->pp_size || ctx->master) { | |
445 | ctx->psn_phys = ctx->afu->psn_phys; | |
446 | ctx->psn_size = ctx->afu->adapter->ps_size; | |
447 | } else { | |
448 | ctx->psn_phys = ctx->afu->psn_phys + | |
449 | (ctx->afu->pp_offset + ctx->afu->pp_size * ctx->pe); | |
450 | ctx->psn_size = ctx->afu->pp_size; | |
451 | } | |
452 | } | |
453 | ||
454 | static int activate_afu_directed(struct cxl_afu *afu) | |
455 | { | |
456 | int rc; | |
457 | ||
458 | dev_info(&afu->dev, "Activating AFU directed mode\n"); | |
459 | ||
4108efb0 | 460 | afu->num_procs = afu->max_procs_virtualised; |
05155772 DA |
461 | if (afu->spa == NULL) { |
462 | if (cxl_alloc_spa(afu)) | |
463 | return -ENOMEM; | |
464 | } | |
465 | attach_spa(afu); | |
f204e0b8 IM |
466 | |
467 | cxl_p1n_write(afu, CXL_PSL_SCNTL_An, CXL_PSL_SCNTL_An_PM_AFU); | |
468 | cxl_p1n_write(afu, CXL_PSL_AMOR_An, 0xFFFFFFFFFFFFFFFFULL); | |
469 | cxl_p1n_write(afu, CXL_PSL_ID_An, CXL_PSL_ID_An_F | CXL_PSL_ID_An_L); | |
470 | ||
471 | afu->current_mode = CXL_MODE_DIRECTED; | |
f204e0b8 IM |
472 | |
473 | if ((rc = cxl_chardev_m_afu_add(afu))) | |
474 | return rc; | |
475 | ||
476 | if ((rc = cxl_sysfs_afu_m_add(afu))) | |
477 | goto err; | |
478 | ||
479 | if ((rc = cxl_chardev_s_afu_add(afu))) | |
480 | goto err1; | |
481 | ||
482 | return 0; | |
483 | err1: | |
484 | cxl_sysfs_afu_m_remove(afu); | |
485 | err: | |
486 | cxl_chardev_afu_remove(afu); | |
487 | return rc; | |
488 | } | |
489 | ||
490 | #ifdef CONFIG_CPU_LITTLE_ENDIAN | |
491 | #define set_endian(sr) ((sr) |= CXL_PSL_SR_An_LE) | |
492 | #else | |
493 | #define set_endian(sr) ((sr) &= ~(CXL_PSL_SR_An_LE)) | |
494 | #endif | |
495 | ||
2f663527 MN |
496 | static u64 calculate_sr(struct cxl_context *ctx) |
497 | { | |
498 | u64 sr = 0; | |
499 | ||
500 | if (ctx->master) | |
501 | sr |= CXL_PSL_SR_An_MP; | |
502 | if (mfspr(SPRN_LPCR) & LPCR_TC) | |
503 | sr |= CXL_PSL_SR_An_TC; | |
504 | if (ctx->kernel) { | |
505 | sr |= CXL_PSL_SR_An_R | (mfmsr() & MSR_SF); | |
506 | sr |= CXL_PSL_SR_An_HV; | |
507 | } else { | |
508 | sr |= CXL_PSL_SR_An_PR | CXL_PSL_SR_An_R; | |
509 | set_endian(sr); | |
510 | sr &= ~(CXL_PSL_SR_An_HV); | |
511 | if (!test_tsk_thread_flag(current, TIF_32BIT)) | |
512 | sr |= CXL_PSL_SR_An_SF; | |
513 | } | |
514 | return sr; | |
515 | } | |
516 | ||
f204e0b8 IM |
517 | static int attach_afu_directed(struct cxl_context *ctx, u64 wed, u64 amr) |
518 | { | |
2f663527 | 519 | u32 pid; |
f204e0b8 IM |
520 | int r, result; |
521 | ||
1a1a94b8 | 522 | cxl_assign_psn_space(ctx); |
f204e0b8 IM |
523 | |
524 | ctx->elem->ctxtime = 0; /* disable */ | |
525 | ctx->elem->lpid = cpu_to_be32(mfspr(SPRN_LPID)); | |
526 | ctx->elem->haurp = 0; /* disable */ | |
527 | ctx->elem->sdr = cpu_to_be64(mfspr(SPRN_SDR1)); | |
528 | ||
2f663527 MN |
529 | pid = current->pid; |
530 | if (ctx->kernel) | |
531 | pid = 0; | |
f204e0b8 | 532 | ctx->elem->common.tid = 0; |
2f663527 MN |
533 | ctx->elem->common.pid = cpu_to_be32(pid); |
534 | ||
535 | ctx->elem->sr = cpu_to_be64(calculate_sr(ctx)); | |
f204e0b8 IM |
536 | |
537 | ctx->elem->common.csrp = 0; /* disable */ | |
538 | ctx->elem->common.aurp0 = 0; /* disable */ | |
539 | ctx->elem->common.aurp1 = 0; /* disable */ | |
540 | ||
541 | cxl_prefault(ctx, wed); | |
542 | ||
543 | ctx->elem->common.sstp0 = cpu_to_be64(ctx->sstp0); | |
544 | ctx->elem->common.sstp1 = cpu_to_be64(ctx->sstp1); | |
545 | ||
546 | for (r = 0; r < CXL_IRQ_RANGES; r++) { | |
547 | ctx->elem->ivte_offsets[r] = cpu_to_be16(ctx->irqs.offset[r]); | |
548 | ctx->elem->ivte_ranges[r] = cpu_to_be16(ctx->irqs.range[r]); | |
549 | } | |
550 | ||
551 | ctx->elem->common.amr = cpu_to_be64(amr); | |
552 | ctx->elem->common.wed = cpu_to_be64(wed); | |
553 | ||
554 | /* first guy needs to enable */ | |
1a1a94b8 | 555 | if ((result = cxl_afu_check_and_enable(ctx->afu))) |
f204e0b8 IM |
556 | return result; |
557 | ||
368857c1 | 558 | return add_process_element(ctx); |
f204e0b8 IM |
559 | } |
560 | ||
561 | static int deactivate_afu_directed(struct cxl_afu *afu) | |
562 | { | |
563 | dev_info(&afu->dev, "Deactivating AFU directed mode\n"); | |
564 | ||
565 | afu->current_mode = 0; | |
566 | afu->num_procs = 0; | |
567 | ||
568 | cxl_sysfs_afu_m_remove(afu); | |
569 | cxl_chardev_afu_remove(afu); | |
570 | ||
b12994fb | 571 | __cxl_afu_reset(afu); |
f204e0b8 IM |
572 | cxl_afu_disable(afu); |
573 | cxl_psl_purge(afu); | |
574 | ||
f204e0b8 IM |
575 | return 0; |
576 | } | |
577 | ||
578 | static int activate_dedicated_process(struct cxl_afu *afu) | |
579 | { | |
580 | dev_info(&afu->dev, "Activating dedicated process mode\n"); | |
581 | ||
582 | cxl_p1n_write(afu, CXL_PSL_SCNTL_An, CXL_PSL_SCNTL_An_PM_Process); | |
583 | ||
584 | cxl_p1n_write(afu, CXL_PSL_CtxTime_An, 0); /* disable */ | |
585 | cxl_p1n_write(afu, CXL_PSL_SPAP_An, 0); /* disable */ | |
586 | cxl_p1n_write(afu, CXL_PSL_AMOR_An, 0xFFFFFFFFFFFFFFFFULL); | |
587 | cxl_p1n_write(afu, CXL_PSL_LPID_An, mfspr(SPRN_LPID)); | |
588 | cxl_p1n_write(afu, CXL_HAURP_An, 0); /* disable */ | |
589 | cxl_p1n_write(afu, CXL_PSL_SDR_An, mfspr(SPRN_SDR1)); | |
590 | ||
591 | cxl_p2n_write(afu, CXL_CSRP_An, 0); /* disable */ | |
592 | cxl_p2n_write(afu, CXL_AURP0_An, 0); /* disable */ | |
593 | cxl_p2n_write(afu, CXL_AURP1_An, 0); /* disable */ | |
594 | ||
595 | afu->current_mode = CXL_MODE_DEDICATED; | |
596 | afu->num_procs = 1; | |
597 | ||
598 | return cxl_chardev_d_afu_add(afu); | |
599 | } | |
600 | ||
601 | static int attach_dedicated(struct cxl_context *ctx, u64 wed, u64 amr) | |
602 | { | |
603 | struct cxl_afu *afu = ctx->afu; | |
2f663527 | 604 | u64 pid; |
f204e0b8 IM |
605 | int rc; |
606 | ||
2f663527 MN |
607 | pid = (u64)current->pid << 32; |
608 | if (ctx->kernel) | |
609 | pid = 0; | |
610 | cxl_p2n_write(afu, CXL_PSL_PID_TID_An, pid); | |
611 | ||
612 | cxl_p1n_write(afu, CXL_PSL_SR_An, calculate_sr(ctx)); | |
f204e0b8 IM |
613 | |
614 | if ((rc = cxl_write_sstp(afu, ctx->sstp0, ctx->sstp1))) | |
615 | return rc; | |
616 | ||
617 | cxl_prefault(ctx, wed); | |
618 | ||
619 | cxl_p1n_write(afu, CXL_PSL_IVTE_Offset_An, | |
620 | (((u64)ctx->irqs.offset[0] & 0xffff) << 48) | | |
621 | (((u64)ctx->irqs.offset[1] & 0xffff) << 32) | | |
622 | (((u64)ctx->irqs.offset[2] & 0xffff) << 16) | | |
623 | ((u64)ctx->irqs.offset[3] & 0xffff)); | |
624 | cxl_p1n_write(afu, CXL_PSL_IVTE_Limit_An, (u64) | |
625 | (((u64)ctx->irqs.range[0] & 0xffff) << 48) | | |
626 | (((u64)ctx->irqs.range[1] & 0xffff) << 32) | | |
627 | (((u64)ctx->irqs.range[2] & 0xffff) << 16) | | |
628 | ((u64)ctx->irqs.range[3] & 0xffff)); | |
629 | ||
630 | cxl_p2n_write(afu, CXL_PSL_AMR_An, amr); | |
631 | ||
632 | /* master only context for dedicated */ | |
1a1a94b8 | 633 | cxl_assign_psn_space(ctx); |
f204e0b8 | 634 | |
b12994fb | 635 | if ((rc = __cxl_afu_reset(afu))) |
f204e0b8 IM |
636 | return rc; |
637 | ||
638 | cxl_p2n_write(afu, CXL_PSL_WED_An, wed); | |
639 | ||
640 | return afu_enable(afu); | |
641 | } | |
642 | ||
643 | static int deactivate_dedicated_process(struct cxl_afu *afu) | |
644 | { | |
645 | dev_info(&afu->dev, "Deactivating dedicated process mode\n"); | |
646 | ||
647 | afu->current_mode = 0; | |
648 | afu->num_procs = 0; | |
649 | ||
650 | cxl_chardev_afu_remove(afu); | |
651 | ||
652 | return 0; | |
653 | } | |
654 | ||
655 | int _cxl_afu_deactivate_mode(struct cxl_afu *afu, int mode) | |
656 | { | |
657 | if (mode == CXL_MODE_DIRECTED) | |
658 | return deactivate_afu_directed(afu); | |
659 | if (mode == CXL_MODE_DEDICATED) | |
660 | return deactivate_dedicated_process(afu); | |
661 | return 0; | |
662 | } | |
663 | ||
664 | int cxl_afu_deactivate_mode(struct cxl_afu *afu) | |
665 | { | |
666 | return _cxl_afu_deactivate_mode(afu, afu->current_mode); | |
667 | } | |
668 | ||
669 | int cxl_afu_activate_mode(struct cxl_afu *afu, int mode) | |
670 | { | |
671 | if (!mode) | |
672 | return 0; | |
673 | if (!(mode & afu->modes_supported)) | |
674 | return -EINVAL; | |
675 | ||
0b3f9c75 DA |
676 | if (!cxl_adapter_link_ok(afu->adapter)) { |
677 | WARN(1, "Device link is down, refusing to activate!\n"); | |
678 | return -EIO; | |
679 | } | |
680 | ||
f204e0b8 IM |
681 | if (mode == CXL_MODE_DIRECTED) |
682 | return activate_afu_directed(afu); | |
683 | if (mode == CXL_MODE_DEDICATED) | |
684 | return activate_dedicated_process(afu); | |
685 | ||
686 | return -EINVAL; | |
687 | } | |
688 | ||
689 | int cxl_attach_process(struct cxl_context *ctx, bool kernel, u64 wed, u64 amr) | |
690 | { | |
0b3f9c75 DA |
691 | if (!cxl_adapter_link_ok(ctx->afu->adapter)) { |
692 | WARN(1, "Device link is down, refusing to attach process!\n"); | |
693 | return -EIO; | |
694 | } | |
695 | ||
f204e0b8 IM |
696 | ctx->kernel = kernel; |
697 | if (ctx->afu->current_mode == CXL_MODE_DIRECTED) | |
698 | return attach_afu_directed(ctx, wed, amr); | |
699 | ||
700 | if (ctx->afu->current_mode == CXL_MODE_DEDICATED) | |
701 | return attach_dedicated(ctx, wed, amr); | |
702 | ||
703 | return -EINVAL; | |
704 | } | |
705 | ||
706 | static inline int detach_process_native_dedicated(struct cxl_context *ctx) | |
707 | { | |
b12994fb | 708 | __cxl_afu_reset(ctx->afu); |
f204e0b8 IM |
709 | cxl_afu_disable(ctx->afu); |
710 | cxl_psl_purge(ctx->afu); | |
711 | return 0; | |
712 | } | |
713 | ||
f204e0b8 IM |
714 | static inline int detach_process_native_afu_directed(struct cxl_context *ctx) |
715 | { | |
716 | if (!ctx->pe_inserted) | |
717 | return 0; | |
718 | if (terminate_process_element(ctx)) | |
719 | return -1; | |
720 | if (remove_process_element(ctx)) | |
721 | return -1; | |
722 | ||
723 | return 0; | |
724 | } | |
725 | ||
726 | int cxl_detach_process(struct cxl_context *ctx) | |
727 | { | |
9bcf28cd IM |
728 | trace_cxl_detach(ctx); |
729 | ||
f204e0b8 IM |
730 | if (ctx->afu->current_mode == CXL_MODE_DEDICATED) |
731 | return detach_process_native_dedicated(ctx); | |
732 | ||
733 | return detach_process_native_afu_directed(ctx); | |
734 | } | |
735 | ||
bc78b05b | 736 | int cxl_get_irq(struct cxl_afu *afu, struct cxl_irq_info *info) |
f204e0b8 IM |
737 | { |
738 | u64 pidtid; | |
739 | ||
0b3f9c75 DA |
740 | /* If the adapter has gone away, we can't get any meaningful |
741 | * information. | |
742 | */ | |
743 | if (!cxl_adapter_link_ok(afu->adapter)) | |
744 | return -EIO; | |
745 | ||
bc78b05b IM |
746 | info->dsisr = cxl_p2n_read(afu, CXL_PSL_DSISR_An); |
747 | info->dar = cxl_p2n_read(afu, CXL_PSL_DAR_An); | |
748 | info->dsr = cxl_p2n_read(afu, CXL_PSL_DSR_An); | |
749 | pidtid = cxl_p2n_read(afu, CXL_PSL_PID_TID_An); | |
f204e0b8 IM |
750 | info->pid = pidtid >> 32; |
751 | info->tid = pidtid & 0xffffffff; | |
bc78b05b IM |
752 | info->afu_err = cxl_p2n_read(afu, CXL_AFU_ERR_An); |
753 | info->errstat = cxl_p2n_read(afu, CXL_PSL_ErrStat_An); | |
f204e0b8 IM |
754 | |
755 | return 0; | |
756 | } | |
757 | ||
758 | static void recover_psl_err(struct cxl_afu *afu, u64 errstat) | |
759 | { | |
760 | u64 dsisr; | |
761 | ||
de369538 | 762 | pr_devel("RECOVERING FROM PSL ERROR... (0x%016llx)\n", errstat); |
f204e0b8 IM |
763 | |
764 | /* Clear PSL_DSISR[PE] */ | |
765 | dsisr = cxl_p2n_read(afu, CXL_PSL_DSISR_An); | |
766 | cxl_p2n_write(afu, CXL_PSL_DSISR_An, dsisr & ~CXL_PSL_DSISR_An_PE); | |
767 | ||
768 | /* Write 1s to clear error status bits */ | |
769 | cxl_p2n_write(afu, CXL_PSL_ErrStat_An, errstat); | |
770 | } | |
771 | ||
772 | int cxl_ack_irq(struct cxl_context *ctx, u64 tfc, u64 psl_reset_mask) | |
773 | { | |
9bcf28cd | 774 | trace_cxl_psl_irq_ack(ctx, tfc); |
f204e0b8 IM |
775 | if (tfc) |
776 | cxl_p2n_write(ctx->afu, CXL_PSL_TFC_An, tfc); | |
777 | if (psl_reset_mask) | |
778 | recover_psl_err(ctx->afu, psl_reset_mask); | |
779 | ||
780 | return 0; | |
781 | } | |
782 | ||
783 | int cxl_check_error(struct cxl_afu *afu) | |
784 | { | |
785 | return (cxl_p1n_read(afu, CXL_PSL_SCNTL_An) == ~0ULL); | |
786 | } |