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17#include "qemu/osdep.h"
18
19#include "qemu/module.h"
20#include "qapi/error.h"
21#include "exec/address-spaces.h"
22#include "hw/qdev-properties.h"
23#include "hw/pci/pci_ids.h"
24#include "hw/acpi/tpm.h"
25#include "migration/vmstate.h"
26#include "sysemu/tpm_backend.h"
27#include "sysemu/tpm_util.h"
28#include "sysemu/reset.h"
29#include "tpm_prop.h"
30#include "tpm_ppi.h"
31#include "trace.h"
32#include "qom/object.h"
33
34struct CRBState {
35 DeviceState parent_obj;
36
37 TPMBackend *tpmbe;
38 TPMBackendCmd cmd;
39 uint32_t regs[TPM_CRB_R_MAX];
40 MemoryRegion mmio;
41 MemoryRegion cmdmem;
42
43 size_t be_buffer_size;
44
45 bool ppi_enabled;
46 TPMPPI ppi;
47};
48typedef struct CRBState CRBState;
49
50DECLARE_INSTANCE_CHECKER(CRBState, CRB,
51 TYPE_TPM_CRB)
52
53#define CRB_INTF_TYPE_CRB_ACTIVE 0b1
54#define CRB_INTF_VERSION_CRB 0b1
55#define CRB_INTF_CAP_LOCALITY_0_ONLY 0b0
56#define CRB_INTF_CAP_IDLE_FAST 0b0
57#define CRB_INTF_CAP_XFER_SIZE_64 0b11
58#define CRB_INTF_CAP_FIFO_NOT_SUPPORTED 0b0
59#define CRB_INTF_CAP_CRB_SUPPORTED 0b1
60#define CRB_INTF_IF_SELECTOR_CRB 0b1
61
62#define CRB_CTRL_CMD_SIZE (TPM_CRB_ADDR_SIZE - A_CRB_DATA_BUFFER)
63
64enum crb_loc_ctrl {
65 CRB_LOC_CTRL_REQUEST_ACCESS = BIT(0),
66 CRB_LOC_CTRL_RELINQUISH = BIT(1),
67 CRB_LOC_CTRL_SEIZE = BIT(2),
68 CRB_LOC_CTRL_RESET_ESTABLISHMENT_BIT = BIT(3),
69};
70
71enum crb_ctrl_req {
72 CRB_CTRL_REQ_CMD_READY = BIT(0),
73 CRB_CTRL_REQ_GO_IDLE = BIT(1),
74};
75
76enum crb_start {
77 CRB_START_INVOKE = BIT(0),
78};
79
80enum crb_cancel {
81 CRB_CANCEL_INVOKE = BIT(0),
82};
83
84#define TPM_CRB_NO_LOCALITY 0xff
85
86static uint64_t tpm_crb_mmio_read(void *opaque, hwaddr addr,
87 unsigned size)
88{
89 CRBState *s = CRB(opaque);
90 void *regs = (void *)&s->regs + (addr & ~3);
91 unsigned offset = addr & 3;
92 uint32_t val = *(uint32_t *)regs >> (8 * offset);
93
94 switch (addr) {
95 case A_CRB_LOC_STATE:
96 val |= !tpm_backend_get_tpm_established_flag(s->tpmbe);
97 break;
98 }
99
100 trace_tpm_crb_mmio_read(addr, size, val);
101
102 return val;
103}
104
105static uint8_t tpm_crb_get_active_locty(CRBState *s)
106{
107 if (!ARRAY_FIELD_EX32(s->regs, CRB_LOC_STATE, locAssigned)) {
108 return TPM_CRB_NO_LOCALITY;
109 }
110 return ARRAY_FIELD_EX32(s->regs, CRB_LOC_STATE, activeLocality);
111}
112
113static void tpm_crb_mmio_write(void *opaque, hwaddr addr,
114 uint64_t val, unsigned size)
115{
116 CRBState *s = CRB(opaque);
117 uint8_t locty = addr >> 12;
118
119 trace_tpm_crb_mmio_write(addr, size, val);
120
121 switch (addr) {
122 case A_CRB_CTRL_REQ:
123 switch (val) {
124 case CRB_CTRL_REQ_CMD_READY:
125 ARRAY_FIELD_DP32(s->regs, CRB_CTRL_STS,
126 tpmIdle, 0);
127 break;
128 case CRB_CTRL_REQ_GO_IDLE:
129 ARRAY_FIELD_DP32(s->regs, CRB_CTRL_STS,
130 tpmIdle, 1);
131 break;
132 }
133 break;
134 case A_CRB_CTRL_CANCEL:
135 if (val == CRB_CANCEL_INVOKE &&
136 s->regs[R_CRB_CTRL_START] & CRB_START_INVOKE) {
137 tpm_backend_cancel_cmd(s->tpmbe);
138 }
139 break;
140 case A_CRB_CTRL_START:
141 if (val == CRB_START_INVOKE &&
142 !(s->regs[R_CRB_CTRL_START] & CRB_START_INVOKE) &&
143 tpm_crb_get_active_locty(s) == locty) {
144 void *mem = memory_region_get_ram_ptr(&s->cmdmem);
145
146 s->regs[R_CRB_CTRL_START] |= CRB_START_INVOKE;
147 s->cmd = (TPMBackendCmd) {
148 .in = mem,
149 .in_len = MIN(tpm_cmd_get_size(mem), s->be_buffer_size),
150 .out = mem,
151 .out_len = s->be_buffer_size,
152 };
153
154 tpm_backend_deliver_request(s->tpmbe, &s->cmd);
155 }
156 break;
157 case A_CRB_LOC_CTRL:
158 switch (val) {
159 case CRB_LOC_CTRL_RESET_ESTABLISHMENT_BIT:
160
161 break;
162 case CRB_LOC_CTRL_RELINQUISH:
163 ARRAY_FIELD_DP32(s->regs, CRB_LOC_STATE,
164 locAssigned, 0);
165 ARRAY_FIELD_DP32(s->regs, CRB_LOC_STS,
166 Granted, 0);
167 break;
168 case CRB_LOC_CTRL_REQUEST_ACCESS:
169 ARRAY_FIELD_DP32(s->regs, CRB_LOC_STS,
170 Granted, 1);
171 ARRAY_FIELD_DP32(s->regs, CRB_LOC_STS,
172 beenSeized, 0);
173 ARRAY_FIELD_DP32(s->regs, CRB_LOC_STATE,
174 locAssigned, 1);
175 break;
176 }
177 break;
178 }
179}
180
181static const MemoryRegionOps tpm_crb_memory_ops = {
182 .read = tpm_crb_mmio_read,
183 .write = tpm_crb_mmio_write,
184 .endianness = DEVICE_LITTLE_ENDIAN,
185 .valid = {
186 .min_access_size = 1,
187 .max_access_size = 4,
188 },
189};
190
191static void tpm_crb_request_completed(TPMIf *ti, int ret)
192{
193 CRBState *s = CRB(ti);
194
195 s->regs[R_CRB_CTRL_START] &= ~CRB_START_INVOKE;
196 if (ret != 0) {
197 ARRAY_FIELD_DP32(s->regs, CRB_CTRL_STS,
198 tpmSts, 1);
199 }
200}
201
202static enum TPMVersion tpm_crb_get_version(TPMIf *ti)
203{
204 CRBState *s = CRB(ti);
205
206 return tpm_backend_get_tpm_version(s->tpmbe);
207}
208
209static int tpm_crb_pre_save(void *opaque)
210{
211 CRBState *s = opaque;
212
213 tpm_backend_finish_sync(s->tpmbe);
214
215 return 0;
216}
217
218static const VMStateDescription vmstate_tpm_crb = {
219 .name = "tpm-crb",
220 .pre_save = tpm_crb_pre_save,
221 .fields = (VMStateField[]) {
222 VMSTATE_UINT32_ARRAY(regs, CRBState, TPM_CRB_R_MAX),
223 VMSTATE_END_OF_LIST(),
224 }
225};
226
227static Property tpm_crb_properties[] = {
228 DEFINE_PROP_TPMBE("tpmdev", CRBState, tpmbe),
229 DEFINE_PROP_BOOL("ppi", CRBState, ppi_enabled, true),
230 DEFINE_PROP_END_OF_LIST(),
231};
232
233static void tpm_crb_reset(void *dev)
234{
235 CRBState *s = CRB(dev);
236
237 if (s->ppi_enabled) {
238 tpm_ppi_reset(&s->ppi);
239 }
240 tpm_backend_reset(s->tpmbe);
241
242 memset(s->regs, 0, sizeof(s->regs));
243
244 ARRAY_FIELD_DP32(s->regs, CRB_LOC_STATE,
245 tpmRegValidSts, 1);
246 ARRAY_FIELD_DP32(s->regs, CRB_CTRL_STS,
247 tpmIdle, 1);
248 ARRAY_FIELD_DP32(s->regs, CRB_INTF_ID,
249 InterfaceType, CRB_INTF_TYPE_CRB_ACTIVE);
250 ARRAY_FIELD_DP32(s->regs, CRB_INTF_ID,
251 InterfaceVersion, CRB_INTF_VERSION_CRB);
252 ARRAY_FIELD_DP32(s->regs, CRB_INTF_ID,
253 CapLocality, CRB_INTF_CAP_LOCALITY_0_ONLY);
254 ARRAY_FIELD_DP32(s->regs, CRB_INTF_ID,
255 CapCRBIdleBypass, CRB_INTF_CAP_IDLE_FAST);
256 ARRAY_FIELD_DP32(s->regs, CRB_INTF_ID,
257 CapDataXferSizeSupport, CRB_INTF_CAP_XFER_SIZE_64);
258 ARRAY_FIELD_DP32(s->regs, CRB_INTF_ID,
259 CapFIFO, CRB_INTF_CAP_FIFO_NOT_SUPPORTED);
260 ARRAY_FIELD_DP32(s->regs, CRB_INTF_ID,
261 CapCRB, CRB_INTF_CAP_CRB_SUPPORTED);
262 ARRAY_FIELD_DP32(s->regs, CRB_INTF_ID,
263 InterfaceSelector, CRB_INTF_IF_SELECTOR_CRB);
264 ARRAY_FIELD_DP32(s->regs, CRB_INTF_ID,
265 RID, 0b0000);
266 ARRAY_FIELD_DP32(s->regs, CRB_INTF_ID2,
267 VID, PCI_VENDOR_ID_IBM);
268
269 s->regs[R_CRB_CTRL_CMD_SIZE] = CRB_CTRL_CMD_SIZE;
270 s->regs[R_CRB_CTRL_CMD_LADDR] = TPM_CRB_ADDR_BASE + A_CRB_DATA_BUFFER;
271 s->regs[R_CRB_CTRL_RSP_SIZE] = CRB_CTRL_CMD_SIZE;
272 s->regs[R_CRB_CTRL_RSP_ADDR] = TPM_CRB_ADDR_BASE + A_CRB_DATA_BUFFER;
273
274 s->be_buffer_size = MIN(tpm_backend_get_buffer_size(s->tpmbe),
275 CRB_CTRL_CMD_SIZE);
276
277 if (tpm_backend_startup_tpm(s->tpmbe, s->be_buffer_size) < 0) {
278 exit(1);
279 }
280}
281
282static void tpm_crb_realize(DeviceState *dev, Error **errp)
283{
284 CRBState *s = CRB(dev);
285
286 if (!tpm_find()) {
287 error_setg(errp, "at most one TPM device is permitted");
288 return;
289 }
290 if (!s->tpmbe) {
291 error_setg(errp, "'tpmdev' property is required");
292 return;
293 }
294
295 memory_region_init_io(&s->mmio, OBJECT(s), &tpm_crb_memory_ops, s,
296 "tpm-crb-mmio", sizeof(s->regs));
297 memory_region_init_ram(&s->cmdmem, OBJECT(s),
298 "tpm-crb-cmd", CRB_CTRL_CMD_SIZE, errp);
299
300 memory_region_add_subregion(get_system_memory(),
301 TPM_CRB_ADDR_BASE, &s->mmio);
302 memory_region_add_subregion(get_system_memory(),
303 TPM_CRB_ADDR_BASE + sizeof(s->regs), &s->cmdmem);
304
305 if (s->ppi_enabled) {
306 tpm_ppi_init(&s->ppi, get_system_memory(),
307 TPM_PPI_ADDR_BASE, OBJECT(s));
308 }
309
310 qemu_register_reset(tpm_crb_reset, dev);
311}
312
313static void tpm_crb_class_init(ObjectClass *klass, void *data)
314{
315 DeviceClass *dc = DEVICE_CLASS(klass);
316 TPMIfClass *tc = TPM_IF_CLASS(klass);
317
318 dc->realize = tpm_crb_realize;
319 device_class_set_props(dc, tpm_crb_properties);
320 dc->vmsd = &vmstate_tpm_crb;
321 dc->user_creatable = true;
322 tc->model = TPM_MODEL_TPM_CRB;
323 tc->get_version = tpm_crb_get_version;
324 tc->request_completed = tpm_crb_request_completed;
325
326 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
327}
328
329static const TypeInfo tpm_crb_info = {
330 .name = TYPE_TPM_CRB,
331
332 .parent = TYPE_DEVICE,
333 .instance_size = sizeof(CRBState),
334 .class_init = tpm_crb_class_init,
335 .interfaces = (InterfaceInfo[]) {
336 { TYPE_TPM_IF },
337 { }
338 }
339};
340
341static void tpm_crb_register(void)
342{
343 type_register_static(&tpm_crb_info);
344}
345
346type_init(tpm_crb_register)
347
