Bug Summary

File:hw/ppc/spapr_events.c
Location:line 298, column 9
Description:Value stored to 'xinfo' is never read

Annotated Source Code

1/*
2 * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
3 *
4 * RTAS events handling
5 *
6 * Copyright (c) 2012 David Gibson, IBM Corporation.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 * THE SOFTWARE.
25 *
26 */
27#include "cpu.h"
28#include "sysemu/sysemu.h"
29#include "sysemu/char.h"
30#include "hw/qdev.h"
31#include "sysemu/device_tree.h"
32
33#include "hw/ppc/spapr.h"
34#include "hw/ppc/spapr_vio.h"
35
36#include <libfdt.h>
37
38struct rtas_error_log {
39 uint32_t summary;
40#define RTAS_LOG_VERSION_MASK0xff000000 0xff000000
41#define RTAS_LOG_VERSION_60x06000000 0x06000000
42#define RTAS_LOG_SEVERITY_MASK0x00e00000 0x00e00000
43#define RTAS_LOG_SEVERITY_ALREADY_REPORTED0x00c00000 0x00c00000
44#define RTAS_LOG_SEVERITY_FATAL0x00a00000 0x00a00000
45#define RTAS_LOG_SEVERITY_ERROR0x00800000 0x00800000
46#define RTAS_LOG_SEVERITY_ERROR_SYNC0x00600000 0x00600000
47#define RTAS_LOG_SEVERITY_WARNING0x00400000 0x00400000
48#define RTAS_LOG_SEVERITY_EVENT0x00200000 0x00200000
49#define RTAS_LOG_SEVERITY_NO_ERROR0x00000000 0x00000000
50#define RTAS_LOG_DISPOSITION_MASK0x00180000 0x00180000
51#define RTAS_LOG_DISPOSITION_FULLY_RECOVERED0x00000000 0x00000000
52#define RTAS_LOG_DISPOSITION_LIMITED_RECOVERY0x00080000 0x00080000
53#define RTAS_LOG_DISPOSITION_NOT_RECOVERED0x00100000 0x00100000
54#define RTAS_LOG_OPTIONAL_PART_PRESENT0x00040000 0x00040000
55#define RTAS_LOG_INITIATOR_MASK0x0000f000 0x0000f000
56#define RTAS_LOG_INITIATOR_UNKNOWN0x00000000 0x00000000
57#define RTAS_LOG_INITIATOR_CPU0x00001000 0x00001000
58#define RTAS_LOG_INITIATOR_PCI0x00002000 0x00002000
59#define RTAS_LOG_INITIATOR_MEMORY0x00004000 0x00004000
60#define RTAS_LOG_INITIATOR_HOTPLUG0x00006000 0x00006000
61#define RTAS_LOG_TARGET_MASK0x00000f00 0x00000f00
62#define RTAS_LOG_TARGET_UNKNOWN0x00000000 0x00000000
63#define RTAS_LOG_TARGET_CPU0x00000100 0x00000100
64#define RTAS_LOG_TARGET_PCI0x00000200 0x00000200
65#define RTAS_LOG_TARGET_MEMORY0x00000400 0x00000400
66#define RTAS_LOG_TARGET_HOTPLUG0x00000600 0x00000600
67#define RTAS_LOG_TYPE_MASK0x000000ff 0x000000ff
68#define RTAS_LOG_TYPE_OTHER0x00000000 0x00000000
69#define RTAS_LOG_TYPE_RETRY0x00000001 0x00000001
70#define RTAS_LOG_TYPE_TCE_ERR0x00000002 0x00000002
71#define RTAS_LOG_TYPE_INTERN_DEV_FAIL0x00000003 0x00000003
72#define RTAS_LOG_TYPE_TIMEOUT0x00000004 0x00000004
73#define RTAS_LOG_TYPE_DATA_PARITY0x00000005 0x00000005
74#define RTAS_LOG_TYPE_ADDR_PARITY0x00000006 0x00000006
75#define RTAS_LOG_TYPE_CACHE_PARITY0x00000007 0x00000007
76#define RTAS_LOG_TYPE_ADDR_INVALID0x00000008 0x00000008
77#define RTAS_LOG_TYPE_ECC_UNCORR0x00000009 0x00000009
78#define RTAS_LOG_TYPE_ECC_CORR0x0000000a 0x0000000a
79#define RTAS_LOG_TYPE_EPOW0x00000040 0x00000040
80 uint32_t extended_length;
81} QEMU_PACKED__attribute__((packed));
82
83struct rtas_event_log_v6 {
84 uint8_t b0;
85#define RTAS_LOG_V6_B0_VALID0x80 0x80
86#define RTAS_LOG_V6_B0_UNRECOVERABLE_ERROR0x40 0x40
87#define RTAS_LOG_V6_B0_RECOVERABLE_ERROR0x20 0x20
88#define RTAS_LOG_V6_B0_DEGRADED_OPERATION0x10 0x10
89#define RTAS_LOG_V6_B0_PREDICTIVE_ERROR0x08 0x08
90#define RTAS_LOG_V6_B0_NEW_LOG0x04 0x04
91#define RTAS_LOG_V6_B0_BIGENDIAN0x02 0x02
92 uint8_t _resv1;
93 uint8_t b2;
94#define RTAS_LOG_V6_B2_POWERPC_FORMAT0x80 0x80
95#define RTAS_LOG_V6_B2_LOG_FORMAT_MASK0x0f 0x0f
96#define RTAS_LOG_V6_B2_LOG_FORMAT_PLATFORM_EVENT0x0e 0x0e
97 uint8_t _resv2[9];
98 uint32_t company;
99#define RTAS_LOG_V6_COMPANY_IBM0x49424d00 0x49424d00 /* IBM<null> */
100} QEMU_PACKED__attribute__((packed));
101
102struct rtas_event_log_v6_section_header {
103 uint16_t section_id;
104 uint16_t section_length;
105 uint8_t section_version;
106 uint8_t section_subtype;
107 uint16_t creator_component_id;
108} QEMU_PACKED__attribute__((packed));
109
110struct rtas_event_log_v6_maina {
111#define RTAS_LOG_V6_SECTION_ID_MAINA0x5048 0x5048 /* PH */
112 struct rtas_event_log_v6_section_header hdr;
113 uint32_t creation_date; /* BCD: YYYYMMDD */
114 uint32_t creation_time; /* BCD: HHMMSS00 */
115 uint8_t _platform1[8];
116 char creator_id;
117 uint8_t _resv1[2];
118 uint8_t section_count;
119 uint8_t _resv2[4];
120 uint8_t _platform2[8];
121 uint32_t plid;
122 uint8_t _platform3[4];
123} QEMU_PACKED__attribute__((packed));
124
125struct rtas_event_log_v6_mainb {
126#define RTAS_LOG_V6_SECTION_ID_MAINB0x5548 0x5548 /* UH */
127 struct rtas_event_log_v6_section_header hdr;
128 uint8_t subsystem_id;
129 uint8_t _platform1;
130 uint8_t event_severity;
131 uint8_t event_subtype;
132 uint8_t _platform2[4];
133 uint8_t _resv1[2];
134 uint16_t action_flags;
135 uint8_t _resv2[4];
136} QEMU_PACKED__attribute__((packed));
137
138struct rtas_event_log_v6_epow {
139#define RTAS_LOG_V6_SECTION_ID_EPOW0x4550 0x4550 /* EP */
140 struct rtas_event_log_v6_section_header hdr;
141 uint8_t sensor_value;
142#define RTAS_LOG_V6_EPOW_ACTION_RESET0 0
143#define RTAS_LOG_V6_EPOW_ACTION_WARN_COOLING1 1
144#define RTAS_LOG_V6_EPOW_ACTION_WARN_POWER2 2
145#define RTAS_LOG_V6_EPOW_ACTION_SYSTEM_SHUTDOWN3 3
146#define RTAS_LOG_V6_EPOW_ACTION_SYSTEM_HALT4 4
147#define RTAS_LOG_V6_EPOW_ACTION_MAIN_ENCLOSURE5 5
148#define RTAS_LOG_V6_EPOW_ACTION_POWER_OFF7 7
149 uint8_t event_modifier;
150#define RTAS_LOG_V6_EPOW_MODIFIER_NORMAL1 1
151#define RTAS_LOG_V6_EPOW_MODIFIER_ON_UPS2 2
152#define RTAS_LOG_V6_EPOW_MODIFIER_CRITICAL3 3
153#define RTAS_LOG_V6_EPOW_MODIFIER_TEMPERATURE4 4
154 uint8_t extended_modifier;
155#define RTAS_LOG_V6_EPOW_XMODIFIER_SYSTEM_WIDE0 0
156#define RTAS_LOG_V6_EPOW_XMODIFIER_PARTITION_SPECIFIC1 1
157 uint8_t _resv;
158 uint64_t reason_code;
159} QEMU_PACKED__attribute__((packed));
160
161struct epow_log_full {
162 struct rtas_error_log hdr;
163 struct rtas_event_log_v6 v6hdr;
164 struct rtas_event_log_v6_maina maina;
165 struct rtas_event_log_v6_mainb mainb;
166 struct rtas_event_log_v6_epow epow;
167} QEMU_PACKED__attribute__((packed));
168
169#define EVENT_MASK_INTERNAL_ERRORS0x80000000 0x80000000
170#define EVENT_MASK_EPOW0x40000000 0x40000000
171#define EVENT_MASK_HOTPLUG0x10000000 0x10000000
172#define EVENT_MASK_IO0x08000000 0x08000000
173
174#define _FDT(exp)do { int ret = (exp); if (ret < 0) { fprintf(stderr, "qemu: error creating device tree: %s: %s\n"
, "exp", fdt_strerror(ret)); exit(1); } } while (0) \
175 do { \
176 int ret = (exp); \
177 if (ret < 0) { \
178 fprintf(stderrstderr, "qemu: error creating device tree: %s: %s\n", \
179 #exp, fdt_strerror(ret)); \
180 exit(1); \
181 } \
182 } while (0)
183
184void spapr_events_fdt_skel(void *fdt, uint32_t epow_irq)
185{
186 uint32_t epow_irq_ranges[] = {cpu_to_be32(epow_irq), cpu_to_be32(1)};
187 uint32_t epow_interrupts[] = {cpu_to_be32(epow_irq), 0};
188
189 _FDT((fdt_begin_node(fdt, "event-sources")))do { int ret = ((fdt_begin_node(fdt, "event-sources"))); if (
ret < 0) { fprintf(stderr, "qemu: error creating device tree: %s: %s\n"
, "(fdt_begin_node(fdt, \"event-sources\"))", fdt_strerror(ret
)); exit(1); } } while (0);
190
191 _FDT((fdt_property(fdt, "interrupt-controller", NULL, 0)))do { int ret = ((fdt_property(fdt, "interrupt-controller", ((
void*)0), 0))); if (ret < 0) { fprintf(stderr, "qemu: error creating device tree: %s: %s\n"
, "(fdt_property(fdt, \"interrupt-controller\", NULL, 0))", fdt_strerror
(ret)); exit(1); } } while (0);
192 _FDT((fdt_property_cell(fdt, "#interrupt-cells", 2)))do { int ret = ((fdt_property_cell(fdt, "#interrupt-cells", 2
))); if (ret < 0) { fprintf(stderr, "qemu: error creating device tree: %s: %s\n"
, "(fdt_property_cell(fdt, \"#interrupt-cells\", 2))", fdt_strerror
(ret)); exit(1); } } while (0);
193 _FDT((fdt_property(fdt, "interrupt-ranges",do { int ret = ((fdt_property(fdt, "interrupt-ranges", epow_irq_ranges
, sizeof(epow_irq_ranges)))); if (ret < 0) { fprintf(stderr
, "qemu: error creating device tree: %s: %s\n", "(fdt_property(fdt, \"interrupt-ranges\", epow_irq_ranges, sizeof(epow_irq_ranges)))"
, fdt_strerror(ret)); exit(1); } } while (0)
194 epow_irq_ranges, sizeof(epow_irq_ranges))))do { int ret = ((fdt_property(fdt, "interrupt-ranges", epow_irq_ranges
, sizeof(epow_irq_ranges)))); if (ret < 0) { fprintf(stderr
, "qemu: error creating device tree: %s: %s\n", "(fdt_property(fdt, \"interrupt-ranges\", epow_irq_ranges, sizeof(epow_irq_ranges)))"
, fdt_strerror(ret)); exit(1); } } while (0);
195
196 _FDT((fdt_begin_node(fdt, "epow-events")))do { int ret = ((fdt_begin_node(fdt, "epow-events"))); if (ret
< 0) { fprintf(stderr, "qemu: error creating device tree: %s: %s\n"
, "(fdt_begin_node(fdt, \"epow-events\"))", fdt_strerror(ret)
); exit(1); } } while (0);
197 _FDT((fdt_property(fdt, "interrupts",do { int ret = ((fdt_property(fdt, "interrupts", epow_interrupts
, sizeof(epow_interrupts)))); if (ret < 0) { fprintf(stderr
, "qemu: error creating device tree: %s: %s\n", "(fdt_property(fdt, \"interrupts\", epow_interrupts, sizeof(epow_interrupts)))"
, fdt_strerror(ret)); exit(1); } } while (0)
198 epow_interrupts, sizeof(epow_interrupts))))do { int ret = ((fdt_property(fdt, "interrupts", epow_interrupts
, sizeof(epow_interrupts)))); if (ret < 0) { fprintf(stderr
, "qemu: error creating device tree: %s: %s\n", "(fdt_property(fdt, \"interrupts\", epow_interrupts, sizeof(epow_interrupts)))"
, fdt_strerror(ret)); exit(1); } } while (0);
199 _FDT((fdt_end_node(fdt)))do { int ret = ((fdt_end_node(fdt))); if (ret < 0) { fprintf
(stderr, "qemu: error creating device tree: %s: %s\n", "(fdt_end_node(fdt))"
, fdt_strerror(ret)); exit(1); } } while (0);
200
201 _FDT((fdt_end_node(fdt)))do { int ret = ((fdt_end_node(fdt))); if (ret < 0) { fprintf
(stderr, "qemu: error creating device tree: %s: %s\n", "(fdt_end_node(fdt))"
, fdt_strerror(ret)); exit(1); } } while (0);
202}
203
204static struct epow_log_full *pending_epow;
205static uint32_t next_plid;
206
207static void spapr_powerdown_req(Notifier *n, void *opaque)
208{
209 sPAPREnvironment *spapr = container_of(n, sPAPREnvironment, epow_notifier)({ const typeof(((sPAPREnvironment *) 0)->epow_notifier) *
__mptr = (n); (sPAPREnvironment *) ((char *) __mptr - __builtin_offsetof
(sPAPREnvironment, epow_notifier));});
210 struct rtas_error_log *hdr;
211 struct rtas_event_log_v6 *v6hdr;
212 struct rtas_event_log_v6_maina *maina;
213 struct rtas_event_log_v6_mainb *mainb;
214 struct rtas_event_log_v6_epow *epow;
215 struct tm tm;
216 int year;
217
218 if (pending_epow) {
219 /* For now, we just throw away earlier events if two come
220 * along before any are consumed. This is sufficient for our
221 * powerdown messages, but we'll need more if we do more
222 * general error/event logging */
223 g_free(pending_epow);
224 }
225 pending_epow = g_malloc0(sizeof(*pending_epow));
226 hdr = &pending_epow->hdr;
227 v6hdr = &pending_epow->v6hdr;
228 maina = &pending_epow->maina;
229 mainb = &pending_epow->mainb;
230 epow = &pending_epow->epow;
231
232 hdr->summary = cpu_to_be32(RTAS_LOG_VERSION_60x06000000
233 | RTAS_LOG_SEVERITY_EVENT0x00200000
234 | RTAS_LOG_DISPOSITION_NOT_RECOVERED0x00100000
235 | RTAS_LOG_OPTIONAL_PART_PRESENT0x00040000
236 | RTAS_LOG_TYPE_EPOW0x00000040);
237 hdr->extended_length = cpu_to_be32(sizeof(*pending_epow)
238 - sizeof(pending_epow->hdr));
239
240 v6hdr->b0 = RTAS_LOG_V6_B0_VALID0x80 | RTAS_LOG_V6_B0_NEW_LOG0x04
241 | RTAS_LOG_V6_B0_BIGENDIAN0x02;
242 v6hdr->b2 = RTAS_LOG_V6_B2_POWERPC_FORMAT0x80
243 | RTAS_LOG_V6_B2_LOG_FORMAT_PLATFORM_EVENT0x0e;
244 v6hdr->company = cpu_to_be32(RTAS_LOG_V6_COMPANY_IBM0x49424d00);
245
246 maina->hdr.section_id = cpu_to_be16(RTAS_LOG_V6_SECTION_ID_MAINA0x5048);
247 maina->hdr.section_length = cpu_to_be16(sizeof(*maina));
248 /* FIXME: section version, subtype and creator id? */
249 qemu_get_timedate(&tm, spapr->rtc_offset);
250 year = tm.tm_year + 1900;
251 maina->creation_date = cpu_to_be32((to_bcd(year / 100) << 24)
252 | (to_bcd(year % 100) << 16)
253 | (to_bcd(tm.tm_mon + 1) << 8)
254 | to_bcd(tm.tm_mday));
255 maina->creation_time = cpu_to_be32((to_bcd(tm.tm_hour) << 24)
256 | (to_bcd(tm.tm_min) << 16)
257 | (to_bcd(tm.tm_sec) << 8));
258 maina->creator_id = 'H'; /* Hypervisor */
259 maina->section_count = 3; /* Main-A, Main-B and EPOW */
260 maina->plid = next_plid++;
261
262 mainb->hdr.section_id = cpu_to_be16(RTAS_LOG_V6_SECTION_ID_MAINB0x5548);
263 mainb->hdr.section_length = cpu_to_be16(sizeof(*mainb));
264 /* FIXME: section version, subtype and creator id? */
265 mainb->subsystem_id = 0xa0; /* External environment */
266 mainb->event_severity = 0x00; /* Informational / non-error */
267 mainb->event_subtype = 0xd0; /* Normal shutdown */
268
269 epow->hdr.section_id = cpu_to_be16(RTAS_LOG_V6_SECTION_ID_EPOW0x4550);
270 epow->hdr.section_length = cpu_to_be16(sizeof(*epow));
271 epow->hdr.section_version = 2; /* includes extended modifier */
272 /* FIXME: section subtype and creator id? */
273 epow->sensor_value = RTAS_LOG_V6_EPOW_ACTION_SYSTEM_SHUTDOWN3;
274 epow->event_modifier = RTAS_LOG_V6_EPOW_MODIFIER_NORMAL1;
275 epow->extended_modifier = RTAS_LOG_V6_EPOW_XMODIFIER_PARTITION_SPECIFIC1;
276
277 qemu_irq_pulse(xics_get_qirq(spapr->icp, spapr->epow_irq));
278}
279
280static void check_exception(PowerPCCPU *cpu, sPAPREnvironment *spapr,
281 uint32_t token, uint32_t nargs,
282 target_ulong args,
283 uint32_t nret, target_ulong rets)
284{
285 uint32_t mask, buf, len;
286 uint64_t xinfo;
287
288 if ((nargs < 6) || (nargs > 7) || nret != 1) {
289 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR-3);
290 return;
291 }
292
293 xinfo = rtas_ld(args, 1);
294 mask = rtas_ld(args, 2);
295 buf = rtas_ld(args, 4);
296 len = rtas_ld(args, 5);
297 if (nargs == 7) {
298 xinfo |= (uint64_t)rtas_ld(args, 6) << 32;
Value stored to 'xinfo' is never read
299 }
300
301 if ((mask & EVENT_MASK_EPOW0x40000000) && pending_epow) {
302 if (sizeof(*pending_epow) < len) {
303 len = sizeof(*pending_epow);
304 }
305
306 cpu_physical_memory_write(buf, pending_epow, len);
307 g_free(pending_epow);
308 pending_epow = NULL((void*)0);
309 rtas_st(rets, 0, RTAS_OUT_SUCCESS0);
310 } else {
311 rtas_st(rets, 0, RTAS_OUT_NO_ERRORS_FOUND1);
312 }
313}
314
315void spapr_events_init(sPAPREnvironment *spapr)
316{
317 spapr->epow_irq = spapr_allocate_msi(0);
318 spapr->epow_notifier.notify = spapr_powerdown_req;
319 qemu_register_powerdown_notifier(&spapr->epow_notifier);
320 spapr_rtas_register("check-exception", check_exception);
321}