xref: /openbmc/qemu/tests/qtest/q35-test.c (revision b14df228) 
1 /*
2  * QTest testcase for Q35 northbridge
3  *
4  * Copyright (c) 2015 Red Hat, Inc.
5  *
6  * Author: Gerd Hoffmann <kraxel@redhat.com>
7  *
8  * This work is licensed under the terms of the GNU GPL, version 2 or later.
9  * See the COPYING file in the top-level directory.
10  */
11 
12 #include "qemu/osdep.h"
13 #include "libqtest.h"
14 #include "libqos/pci.h"
15 #include "libqos/pci-pc.h"
16 #include "hw/pci-host/q35.h"
17 #include "qapi/qmp/qdict.h"
18 
19 #define TSEG_SIZE_TEST_GUEST_RAM_MBYTES 128
20 
21 /* @esmramc_tseg_sz: ESMRAMC.TSEG_SZ bitmask for selecting the requested TSEG
22  *                   size. Must be a subset of
23  *                   MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_MASK.
24  *
25  * @extended_tseg_mbytes: Size of the extended TSEG. Only consulted if
26  *                        @esmramc_tseg_sz equals
27  *                        MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_MASK precisely.
28  *
29  * @expected_tseg_mbytes: Expected guest-visible TSEG size in megabytes,
30  *                        matching @esmramc_tseg_sz and @extended_tseg_mbytes
31  *                        above.
32  */
33 struct TsegSizeArgs {
34     uint8_t esmramc_tseg_sz;
35     uint16_t extended_tseg_mbytes;
36     uint16_t expected_tseg_mbytes;
37 };
38 typedef struct TsegSizeArgs TsegSizeArgs;
39 
40 static const TsegSizeArgs tseg_1mb = {
41     .esmramc_tseg_sz      = MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_1MB,
42     .extended_tseg_mbytes = 0,
43     .expected_tseg_mbytes = 1,
44 };
45 static const TsegSizeArgs tseg_2mb = {
46     .esmramc_tseg_sz      = MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_2MB,
47     .extended_tseg_mbytes = 0,
48     .expected_tseg_mbytes = 2,
49 };
50 static const TsegSizeArgs tseg_8mb = {
51     .esmramc_tseg_sz      = MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_8MB,
52     .extended_tseg_mbytes = 0,
53     .expected_tseg_mbytes = 8,
54 };
55 static const TsegSizeArgs tseg_ext_16mb = {
56     .esmramc_tseg_sz      = MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_MASK,
57     .extended_tseg_mbytes = 16,
58     .expected_tseg_mbytes = 16,
59 };
60 
61 static void smram_set_bit(QPCIDevice *pcidev, uint8_t mask, bool enabled)
62 {
63     uint8_t smram;
64 
65     smram = qpci_config_readb(pcidev, MCH_HOST_BRIDGE_SMRAM);
66     if (enabled) {
67         smram |= mask;
68     } else {
69         smram &= ~mask;
70     }
71     qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_SMRAM, smram);
72 }
73 
74 static bool smram_test_bit(QPCIDevice *pcidev, uint8_t mask)
75 {
76     uint8_t smram;
77 
78     smram = qpci_config_readb(pcidev, MCH_HOST_BRIDGE_SMRAM);
79     return smram & mask;
80 }
81 
82 static void test_smram_lock(void)
83 {
84     QPCIBus *pcibus;
85     QPCIDevice *pcidev;
86     QDict *response;
87     QTestState *qts;
88 
89     qts = qtest_init("-M q35");
90 
91     pcibus = qpci_new_pc(qts, NULL);
92     g_assert(pcibus != NULL);
93 
94     pcidev = qpci_device_find(pcibus, 0);
95     g_assert(pcidev != NULL);
96 
97     /* check open is settable */
98     smram_set_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN, false);
99     g_assert(smram_test_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN) == false);
100     smram_set_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN, true);
101     g_assert(smram_test_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN) == true);
102 
103     /* lock, check open is cleared & not settable */
104     smram_set_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_LCK, true);
105     g_assert(smram_test_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN) == false);
106     smram_set_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN, true);
107     g_assert(smram_test_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN) == false);
108 
109     /* reset */
110     response = qtest_qmp(qts, "{'execute': 'system_reset', 'arguments': {} }");
111     g_assert(response);
112     g_assert(!qdict_haskey(response, "error"));
113     qobject_unref(response);
114 
115     /* check open is settable again */
116     smram_set_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN, false);
117     g_assert(smram_test_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN) == false);
118     smram_set_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN, true);
119     g_assert(smram_test_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN) == true);
120 
121     g_free(pcidev);
122     qpci_free_pc(pcibus);
123 
124     qtest_quit(qts);
125 }
126 
127 static void test_tseg_size(const void *data)
128 {
129     const TsegSizeArgs *args = data;
130     QPCIBus *pcibus;
131     QPCIDevice *pcidev;
132     uint8_t smram_val;
133     uint8_t esmramc_val;
134     uint32_t ram_offs;
135     QTestState *qts;
136 
137     if (args->esmramc_tseg_sz == MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_MASK) {
138         qts = qtest_initf("-M q35 -m %uM -global mch.extended-tseg-mbytes=%u",
139                           TSEG_SIZE_TEST_GUEST_RAM_MBYTES,
140                           args->extended_tseg_mbytes);
141     } else {
142         qts = qtest_initf("-M q35 -m %uM", TSEG_SIZE_TEST_GUEST_RAM_MBYTES);
143     }
144 
145     /* locate the DRAM controller */
146     pcibus = qpci_new_pc(qts, NULL);
147     g_assert(pcibus != NULL);
148     pcidev = qpci_device_find(pcibus, 0);
149     g_assert(pcidev != NULL);
150 
151     /* Set TSEG size. Restrict TSEG visibility to SMM by setting T_EN. */
152     esmramc_val = qpci_config_readb(pcidev, MCH_HOST_BRIDGE_ESMRAMC);
153     esmramc_val &= ~MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_MASK;
154     esmramc_val |= args->esmramc_tseg_sz;
155     esmramc_val |= MCH_HOST_BRIDGE_ESMRAMC_T_EN;
156     qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_ESMRAMC, esmramc_val);
157 
158     /* Enable TSEG by setting G_SMRAME. Close TSEG by setting D_CLS. */
159     smram_val = qpci_config_readb(pcidev, MCH_HOST_BRIDGE_SMRAM);
160     smram_val &= ~(MCH_HOST_BRIDGE_SMRAM_D_OPEN |
161                    MCH_HOST_BRIDGE_SMRAM_D_LCK);
162     smram_val |= (MCH_HOST_BRIDGE_SMRAM_D_CLS |
163                   MCH_HOST_BRIDGE_SMRAM_G_SMRAME);
164     qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_SMRAM, smram_val);
165 
166     /* lock TSEG */
167     smram_val |= MCH_HOST_BRIDGE_SMRAM_D_LCK;
168     qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_SMRAM, smram_val);
169 
170     /* Now check that the byte right before the TSEG is r/w, and that the first
171      * byte in the TSEG always reads as 0xff.
172      */
173     ram_offs = (TSEG_SIZE_TEST_GUEST_RAM_MBYTES - args->expected_tseg_mbytes) *
174                1024 * 1024 - 1;
175     g_assert_cmpint(qtest_readb(qts, ram_offs), ==, 0);
176     qtest_writeb(qts, ram_offs, 1);
177     g_assert_cmpint(qtest_readb(qts, ram_offs), ==, 1);
178 
179     ram_offs++;
180     g_assert_cmpint(qtest_readb(qts, ram_offs), ==, 0xff);
181     qtest_writeb(qts, ram_offs, 1);
182     g_assert_cmpint(qtest_readb(qts, ram_offs), ==, 0xff);
183 
184     g_free(pcidev);
185     qpci_free_pc(pcibus);
186     qtest_quit(qts);
187 }
188 
189 #define SMBASE 0x30000
190 #define SMRAM_TEST_PATTERN 0x32
191 #define SMRAM_TEST_RESET_PATTERN 0x23
192 
193 static void test_smram_smbase_lock(void)
194 {
195     QPCIBus *pcibus;
196     QPCIDevice *pcidev;
197     QDict *response;
198     QTestState *qts;
199     int i;
200 
201     qts = qtest_init("-M q35");
202 
203     pcibus = qpci_new_pc(qts, NULL);
204     g_assert(pcibus != NULL);
205 
206     pcidev = qpci_device_find(pcibus, 0);
207     g_assert(pcidev != NULL);
208 
209     /* check that SMRAM is not enabled by default */
210     g_assert(qpci_config_readb(pcidev, MCH_HOST_BRIDGE_F_SMBASE) == 0);
211     qtest_writeb(qts, SMBASE, SMRAM_TEST_PATTERN);
212     g_assert_cmpint(qtest_readb(qts, SMBASE), ==, SMRAM_TEST_PATTERN);
213 
214     /* check that writing junk to 0x9c before before negotiating is ignored */
215     for (i = 0; i < 0xff; i++) {
216         qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_F_SMBASE, i);
217         g_assert(qpci_config_readb(pcidev, MCH_HOST_BRIDGE_F_SMBASE) == 0);
218     }
219 
220     /* enable SMRAM at SMBASE */
221     qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_F_SMBASE, 0xff);
222     g_assert(qpci_config_readb(pcidev, MCH_HOST_BRIDGE_F_SMBASE) == 0x01);
223     /* lock SMRAM at SMBASE */
224     qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_F_SMBASE, 0x02);
225     g_assert(qpci_config_readb(pcidev, MCH_HOST_BRIDGE_F_SMBASE) == 0x02);
226 
227     /* check that SMRAM at SMBASE is locked and can't be unlocked */
228     g_assert_cmpint(qtest_readb(qts, SMBASE), ==, 0xff);
229     for (i = 0; i <= 0xff; i++) {
230         /* make sure register is immutable */
231         qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_F_SMBASE, i);
232         g_assert(qpci_config_readb(pcidev, MCH_HOST_BRIDGE_F_SMBASE) == 0x02);
233 
234         /* RAM access should go into black hole */
235         qtest_writeb(qts, SMBASE, SMRAM_TEST_PATTERN);
236         g_assert_cmpint(qtest_readb(qts, SMBASE), ==, 0xff);
237     }
238 
239     /* reset */
240     response = qtest_qmp(qts, "{'execute': 'system_reset', 'arguments': {} }");
241     g_assert(response);
242     g_assert(!qdict_haskey(response, "error"));
243     qobject_unref(response);
244 
245     /* check RAM at SMBASE is available after reset */
246     g_assert_cmpint(qtest_readb(qts, SMBASE), ==, SMRAM_TEST_PATTERN);
247     g_assert(qpci_config_readb(pcidev, MCH_HOST_BRIDGE_F_SMBASE) == 0);
248     qtest_writeb(qts, SMBASE, SMRAM_TEST_RESET_PATTERN);
249     g_assert_cmpint(qtest_readb(qts, SMBASE), ==, SMRAM_TEST_RESET_PATTERN);
250 
251     g_free(pcidev);
252     qpci_free_pc(pcibus);
253 
254     qtest_quit(qts);
255 }
256 
257 static void test_without_smram_base(void)
258 {
259     QPCIBus *pcibus;
260     QPCIDevice *pcidev;
261     QTestState *qts;
262     int i;
263 
264     qts = qtest_init("-M pc-q35-4.1");
265 
266     pcibus = qpci_new_pc(qts, NULL);
267     g_assert(pcibus != NULL);
268 
269     pcidev = qpci_device_find(pcibus, 0);
270     g_assert(pcidev != NULL);
271 
272     /* check that RAM is accessible */
273     qtest_writeb(qts, SMBASE, SMRAM_TEST_PATTERN);
274     g_assert_cmpint(qtest_readb(qts, SMBASE), ==, SMRAM_TEST_PATTERN);
275 
276     /* check that writing to 0x9c succeeds */
277     for (i = 0; i <= 0xff; i++) {
278         qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_F_SMBASE, i);
279         g_assert(qpci_config_readb(pcidev, MCH_HOST_BRIDGE_F_SMBASE) == i);
280     }
281 
282     /* check that RAM is still accessible */
283     qtest_writeb(qts, SMBASE, SMRAM_TEST_PATTERN + 1);
284     g_assert_cmpint(qtest_readb(qts, SMBASE), ==, (SMRAM_TEST_PATTERN + 1));
285 
286     g_free(pcidev);
287     qpci_free_pc(pcibus);
288 
289     qtest_quit(qts);
290 }
291 
292 int main(int argc, char **argv)
293 {
294     g_test_init(&argc, &argv, NULL);
295 
296     qtest_add_func("/q35/smram/lock", test_smram_lock);
297 
298     qtest_add_data_func("/q35/tseg-size/1mb", &tseg_1mb, test_tseg_size);
299     qtest_add_data_func("/q35/tseg-size/2mb", &tseg_2mb, test_tseg_size);
300     qtest_add_data_func("/q35/tseg-size/8mb", &tseg_8mb, test_tseg_size);
301     qtest_add_data_func("/q35/tseg-size/ext/16mb", &tseg_ext_16mb,
302                         test_tseg_size);
303     qtest_add_func("/q35/smram/smbase_lock", test_smram_smbase_lock);
304     qtest_add_func("/q35/smram/legacy_smbase", test_without_smram_base);
305     return g_test_run();
306 }
307