1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Tests sigp store additional status order
4 *
5 * Copyright IBM Corp. 2022
6 *
7 * Authors:
8 * Nico Boehr <nrb@linux.ibm.com>
9 */
10 #include <libcflat.h>
11 #include <asm/asm-offsets.h>
12 #include <asm/interrupt.h>
13 #include <asm/facility.h>
14 #include <asm-generic/barrier.h>
15 #include <asm/sigp.h>
16 #include <asm/vector.h>
17
18 #include <smp.h>
19 #include <gs.h>
20
21 static int testflag = 0;
22
23 #define INVALID_CPU_ADDRESS -4711
24
25 struct mcesa_lc12 {
26 uint8_t vregs[0x200]; /* 0x000 */
27 uint8_t reserved200[0x400 - 0x200]; /* 0x200 */
28 struct gs_cb gs_cb; /* 0x400 */
29 uint8_t reserved420[0x800 - 0x420]; /* 0x420 */
30 uint8_t reserved800[0x1000 - 0x800]; /* 0x800 */
31 };
32
33 static struct mcesa_lc12 adtl_status __attribute__((aligned(4096)));
34
35 static uint8_t expected_vec_contents[VEC_REGISTER_NUM][VEC_REGISTER_SIZE];
36
37 static struct gs_cb gs_cb;
38 static struct gs_epl gs_epl;
39
memisset(void * s,int c,size_t n)40 static bool memisset(void *s, int c, size_t n)
41 {
42 uint8_t *p = s;
43 size_t i;
44
45 for (i = 0; i < n; i++) {
46 if (p[i] != c)
47 return false;
48 }
49
50 return true;
51 }
52
wait_for_flag(void)53 static void wait_for_flag(void)
54 {
55 while (!testflag)
56 mb();
57 }
58
set_flag(int val)59 static void set_flag(int val)
60 {
61 mb();
62 testflag = val;
63 mb();
64 }
65
test_func(void)66 static void test_func(void)
67 {
68 set_flag(1);
69 }
70
have_adtl_status(void)71 static bool have_adtl_status(void)
72 {
73 return test_facility(133) || test_facility(129);
74 }
75
test_store_adtl_status(void)76 static void test_store_adtl_status(void)
77 {
78 uint32_t status = -1;
79 int cc;
80
81 report_prefix_push("store additional status");
82
83 if (!have_adtl_status()) {
84 report_skip("no guarded-storage or vector facility installed");
85 goto out;
86 }
87
88 memset(&adtl_status, 0xff, sizeof(adtl_status));
89
90 report_prefix_push("running");
91 smp_cpu_restart(1);
92
93 cc = smp_sigp(1, SIGP_STORE_ADDITIONAL_STATUS,
94 (unsigned long)&adtl_status, &status);
95
96 report(cc == 1, "CC = 1");
97 report(status == SIGP_STATUS_INCORRECT_STATE, "status = INCORRECT_STATE");
98 report(memisset(&adtl_status, 0xff, sizeof(adtl_status)),
99 "additional status not touched");
100
101 report_prefix_pop();
102
103 report_prefix_push("invalid CPU address");
104
105 cc = sigp(INVALID_CPU_ADDRESS, SIGP_STORE_ADDITIONAL_STATUS,
106 (unsigned long)&adtl_status, &status);
107 report(cc == 3, "CC = 3");
108 report(memisset(&adtl_status, 0xff, sizeof(adtl_status)),
109 "additional status not touched");
110
111 report_prefix_pop();
112
113 report_prefix_push("unaligned");
114 smp_cpu_stop(1);
115
116 cc = smp_sigp(1, SIGP_STORE_ADDITIONAL_STATUS,
117 (unsigned long)&adtl_status + 256, &status);
118 report(cc == 1, "CC = 1");
119 report(status == SIGP_STATUS_INVALID_PARAMETER, "status = INVALID_PARAMETER");
120 report(memisset(&adtl_status, 0xff, sizeof(adtl_status)),
121 "additional status not touched");
122
123 report_prefix_pop();
124
125 out:
126 report_prefix_pop();
127 }
128
test_store_adtl_status_unavail(void)129 static void test_store_adtl_status_unavail(void)
130 {
131 uint32_t status = 0;
132 int cc;
133
134 report_prefix_push("store additional status unavailable");
135
136 if (have_adtl_status()) {
137 report_skip("guarded-storage or vector facility installed");
138 goto out;
139 }
140
141 report_prefix_push("not accepted");
142 smp_cpu_stop(1);
143
144 memset(&adtl_status, 0xff, sizeof(adtl_status));
145
146 cc = smp_sigp(1, SIGP_STORE_ADDITIONAL_STATUS,
147 (unsigned long)&adtl_status, &status);
148
149 report(cc == 1, "CC = 1");
150 report(status == SIGP_STATUS_INVALID_ORDER,
151 "status = INVALID_ORDER");
152 report(memisset(&adtl_status, 0xff, sizeof(adtl_status)),
153 "additional status not touched");
154
155 report_prefix_pop();
156
157 out:
158 report_prefix_pop();
159 }
160
restart_write_vector(void)161 static void restart_write_vector(void)
162 {
163 uint8_t *vec_reg;
164 /* vlm handles at most 16 registers at a time */
165 uint8_t *vec_reg_16_31 = &expected_vec_contents[16][0];
166 uint64_t cr0, cr0_mask = ~BIT_ULL(CTL0_VECTOR);
167 int i;
168
169 for (i = 0; i < VEC_REGISTER_NUM; i++) {
170 vec_reg = &expected_vec_contents[i][0];
171 /* i+1 to avoid zero content */
172 memset(vec_reg, i + 1, VEC_REGISTER_SIZE);
173 }
174
175 ctl_set_bit(0, CTL0_VECTOR);
176
177 asm volatile (
178 " .machine z13\n"
179 /* load vector registers */
180 " vlm 0,15, %[vec_reg_0_15]\n"
181 " vlm 16,31, %[vec_reg_16_31]\n"
182 /* turn off vector instructions */
183 " stctg 0,0, %[cr0]\n"
184 " ng %[cr0_mask], %[cr0]\n"
185 " stg %[cr0_mask], %[cr0]\n"
186 " lctlg 0,0, %[cr0]\n"
187 /* inform CPU 0 we are done by setting testflag to 1 */
188 " mvhi %[testflag], 1\n"
189 /*
190 * infinite loop. function epilogue will restore floating point
191 * registers and hence destroy vector register contents
192 */
193 "0: j 0\n"
194 : [cr0_mask] "+&d"(cr0_mask)
195 : [vec_reg_0_15] "Q"(expected_vec_contents),
196 [vec_reg_16_31] "Q"(*vec_reg_16_31),
197 [cr0] "Q"(cr0),
198 [testflag] "T"(testflag)
199 : "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v8", "v9",
200 "v10", "v11", "v12", "v13", "v14", "v15", "v16", "v17", "v18",
201 "v19", "v20", "v21", "v22", "v23", "v24", "v25", "v26", "v27",
202 "v28", "v29", "v30", "v31", "cc", "memory"
203 );
204 }
205
cpu_write_magic_to_vector_regs(uint16_t cpu_idx)206 static void cpu_write_magic_to_vector_regs(uint16_t cpu_idx)
207 {
208 smp_cpu_stop(cpu_idx);
209
210 set_flag(0);
211
212 smp_cpu_start(cpu_idx, PSW_WITH_CUR_MASK(restart_write_vector));
213
214 wait_for_flag();
215 }
216
adtl_status_check_unmodified_fields_for_lc(unsigned long lc)217 static int adtl_status_check_unmodified_fields_for_lc(unsigned long lc)
218 {
219 assert (!lc || (lc >= 10 && lc <= 12));
220
221 if (lc <= 10 && !memisset(&adtl_status.gs_cb, 0xff, sizeof(adtl_status.gs_cb)))
222 return false;
223
224 if (!memisset(adtl_status.reserved200, 0xff, sizeof(adtl_status.reserved200)))
225 return false;
226
227 if (!memisset(adtl_status.reserved420, 0xff, sizeof(adtl_status.reserved420)))
228 return false;
229
230 if (!memisset(adtl_status.reserved800, 0xff, sizeof(adtl_status.reserved800)))
231 return false;
232
233 return true;
234 }
235
__store_adtl_status_vector_lc(unsigned long lc)236 static void __store_adtl_status_vector_lc(unsigned long lc)
237 {
238 uint32_t status = -1;
239 int cc;
240
241 report_prefix_pushf("LC %lu", lc);
242
243 if (!test_facility(133) && lc) {
244 report_skip("not supported, no guarded-storage facility");
245 goto out;
246 }
247
248 cpu_write_magic_to_vector_regs(1);
249 smp_cpu_stop(1);
250
251 memset(&adtl_status, 0xff, sizeof(adtl_status));
252
253 cc = smp_sigp(1, SIGP_STORE_ADDITIONAL_STATUS,
254 (unsigned long)&adtl_status | lc, &status);
255 report(!cc, "CC = 0");
256
257 report(!memcmp(adtl_status.vregs,
258 expected_vec_contents, sizeof(expected_vec_contents)),
259 "additional status contents match");
260
261 report(adtl_status_check_unmodified_fields_for_lc(lc),
262 "no write outside expected fields");
263
264 /*
265 * To avoid the floating point/vector registers being cleaned up, we
266 * stopped CPU1 right in the middle of a function. Hence the cleanup of
267 * the function didn't run yet and the stackpointer is messed up.
268 * Destroy and re-initalize the CPU to fix that.
269 */
270 smp_cpu_destroy(1);
271 smp_cpu_setup(1, PSW_WITH_CUR_MASK(test_func));
272
273 out:
274 report_prefix_pop();
275 }
276
test_store_adtl_status_vector(void)277 static void test_store_adtl_status_vector(void)
278 {
279 report_prefix_push("store additional status vector");
280
281 if (!test_facility(129)) {
282 report_skip("vector facility not installed");
283 goto out;
284 }
285
286 __store_adtl_status_vector_lc(0);
287 __store_adtl_status_vector_lc(10);
288 __store_adtl_status_vector_lc(11);
289 __store_adtl_status_vector_lc(12);
290
291 out:
292 report_prefix_pop();
293 }
294
restart_write_gs_regs(void)295 static void restart_write_gs_regs(void)
296 {
297 const unsigned long gs_area = 0x2000000;
298 const unsigned long gsc = 25; /* align = 32 M, section size = 512K */
299
300 ctl_set_bit(2, CTL2_GUARDED_STORAGE);
301
302 gs_cb.gsd = gs_area | gsc;
303 gs_cb.gssm = 0xfeedc0ffe;
304 gs_cb.gs_epl_a = (uint64_t) &gs_epl;
305
306 load_gs_cb(&gs_cb);
307
308 set_flag(1);
309
310 ctl_clear_bit(2, CTL2_GUARDED_STORAGE);
311
312 /*
313 * Safe to return here. r14 will point to the endless loop in
314 * smp_cpu_setup_state.
315 */
316 }
317
cpu_write_to_gs_regs(uint16_t cpu_idx)318 static void cpu_write_to_gs_regs(uint16_t cpu_idx)
319 {
320 smp_cpu_stop(cpu_idx);
321
322 set_flag(0);
323
324 smp_cpu_start(cpu_idx, PSW_WITH_CUR_MASK(restart_write_gs_regs));
325
326 wait_for_flag();
327 }
328
__store_adtl_status_gs(unsigned long lc)329 static void __store_adtl_status_gs(unsigned long lc)
330 {
331 uint32_t status = 0;
332 int cc;
333
334 report_prefix_pushf("LC %lu", lc);
335
336 cpu_write_to_gs_regs(1);
337 smp_cpu_stop(1);
338
339 memset(&adtl_status, 0xff, sizeof(adtl_status));
340
341 cc = smp_sigp(1, SIGP_STORE_ADDITIONAL_STATUS,
342 (unsigned long)&adtl_status | lc, &status);
343 report(!cc, "CC = 0");
344
345 report(!memcmp(&adtl_status.gs_cb, &gs_cb, sizeof(gs_cb)),
346 "additional status contents match");
347
348 report(adtl_status_check_unmodified_fields_for_lc(lc),
349 "no write outside expected fields");
350
351 report_prefix_pop();
352 }
353
test_store_adtl_status_gs(void)354 static void test_store_adtl_status_gs(void)
355 {
356 report_prefix_push("store additional status guarded-storage");
357
358 if (!test_facility(133)) {
359 report_skip("guarded-storage facility not installed");
360 goto out;
361 }
362
363 __store_adtl_status_gs(11);
364 __store_adtl_status_gs(12);
365
366 out:
367 report_prefix_pop();
368 }
369
main(void)370 int main(void)
371 {
372 report_prefix_push("adtl_status");
373
374 if (smp_query_num_cpus() == 1) {
375 report_skip("need at least 2 cpus for this test");
376 goto done;
377 }
378
379 /* Setting up the cpu to give it a stack and lowcore */
380 smp_cpu_setup(1, PSW_WITH_CUR_MASK(test_func));
381 smp_cpu_stop(1);
382
383 test_store_adtl_status_unavail();
384 test_store_adtl_status_vector();
385 test_store_adtl_status_gs();
386 test_store_adtl_status();
387 smp_cpu_destroy(1);
388
389 done:
390 report_prefix_pop();
391 return report_summary();
392 }
393