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-rw-r--r--arch/sparc/kernel/spiterrs.S245
1 files changed, 245 insertions, 0 deletions
diff --git a/arch/sparc/kernel/spiterrs.S b/arch/sparc/kernel/spiterrs.S
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1 /* We need to carefully read the error status, ACK the errors,
2 * prevent recursive traps, and pass the information on to C
3 * code for logging.
4 *
5 * We pass the AFAR in as-is, and we encode the status
6 * information as described in asm-sparc64/sfafsr.h
7 */
8 .type __spitfire_access_error,#function
9__spitfire_access_error:
10 /* Disable ESTATE error reporting so that we do not take
11 * recursive traps and RED state the processor.
12 */
13 stxa %g0, [%g0] ASI_ESTATE_ERROR_EN
14 membar #Sync
15
16 mov UDBE_UE, %g1
17 ldxa [%g0] ASI_AFSR, %g4 ! Get AFSR
18
19 /* __spitfire_cee_trap branches here with AFSR in %g4 and
20 * UDBE_CE in %g1. It only clears ESTATE_ERR_CE in the ESTATE
21 * Error Enable register.
22 */
23__spitfire_cee_trap_continue:
24 ldxa [%g0] ASI_AFAR, %g5 ! Get AFAR
25
26 rdpr %tt, %g3
27 and %g3, 0x1ff, %g3 ! Paranoia
28 sllx %g3, SFSTAT_TRAP_TYPE_SHIFT, %g3
29 or %g4, %g3, %g4
30 rdpr %tl, %g3
31 cmp %g3, 1
32 mov 1, %g3
33 bleu %xcc, 1f
34 sllx %g3, SFSTAT_TL_GT_ONE_SHIFT, %g3
35
36 or %g4, %g3, %g4
37
38 /* Read in the UDB error register state, clearing the sticky
39 * error bits as-needed. We only clear them if the UE bit is
40 * set. Likewise, __spitfire_cee_trap below will only do so
41 * if the CE bit is set.
42 *
43 * NOTE: UltraSparc-I/II have high and low UDB error
44 * registers, corresponding to the two UDB units
45 * present on those chips. UltraSparc-IIi only
46 * has a single UDB, called "SDB" in the manual.
47 * For IIi the upper UDB register always reads
48 * as zero so for our purposes things will just
49 * work with the checks below.
50 */
511: ldxa [%g0] ASI_UDBH_ERROR_R, %g3
52 and %g3, 0x3ff, %g7 ! Paranoia
53 sllx %g7, SFSTAT_UDBH_SHIFT, %g7
54 or %g4, %g7, %g4
55 andcc %g3, %g1, %g3 ! UDBE_UE or UDBE_CE
56 be,pn %xcc, 1f
57 nop
58 stxa %g3, [%g0] ASI_UDB_ERROR_W
59 membar #Sync
60
611: mov 0x18, %g3
62 ldxa [%g3] ASI_UDBL_ERROR_R, %g3
63 and %g3, 0x3ff, %g7 ! Paranoia
64 sllx %g7, SFSTAT_UDBL_SHIFT, %g7
65 or %g4, %g7, %g4
66 andcc %g3, %g1, %g3 ! UDBE_UE or UDBE_CE
67 be,pn %xcc, 1f
68 nop
69 mov 0x18, %g7
70 stxa %g3, [%g7] ASI_UDB_ERROR_W
71 membar #Sync
72
731: /* Ok, now that we've latched the error state, clear the
74 * sticky bits in the AFSR.
75 */
76 stxa %g4, [%g0] ASI_AFSR
77 membar #Sync
78
79 rdpr %tl, %g2
80 cmp %g2, 1
81 rdpr %pil, %g2
82 bleu,pt %xcc, 1f
83 wrpr %g0, PIL_NORMAL_MAX, %pil
84
85 ba,pt %xcc, etraptl1
86 rd %pc, %g7
87
88 ba,pt %xcc, 2f
89 nop
90
911: ba,pt %xcc, etrap_irq
92 rd %pc, %g7
93
942:
95#ifdef CONFIG_TRACE_IRQFLAGS
96 call trace_hardirqs_off
97 nop
98#endif
99 mov %l4, %o1
100 mov %l5, %o2
101 call spitfire_access_error
102 add %sp, PTREGS_OFF, %o0
103 ba,pt %xcc, rtrap
104 nop
105 .size __spitfire_access_error,.-__spitfire_access_error
106
107 /* This is the trap handler entry point for ECC correctable
108 * errors. They are corrected, but we listen for the trap so
109 * that the event can be logged.
110 *
111 * Disrupting errors are either:
112 * 1) single-bit ECC errors during UDB reads to system
113 * memory
114 * 2) data parity errors during write-back events
115 *
116 * As far as I can make out from the manual, the CEE trap is
117 * only for correctable errors during memory read accesses by
118 * the front-end of the processor.
119 *
120 * The code below is only for trap level 1 CEE events, as it
121 * is the only situation where we can safely record and log.
122 * For trap level >1 we just clear the CE bit in the AFSR and
123 * return.
124 *
125 * This is just like __spiftire_access_error above, but it
126 * specifically handles correctable errors. If an
127 * uncorrectable error is indicated in the AFSR we will branch
128 * directly above to __spitfire_access_error to handle it
129 * instead. Uncorrectable therefore takes priority over
130 * correctable, and the error logging C code will notice this
131 * case by inspecting the trap type.
132 */
133 .type __spitfire_cee_trap,#function
134__spitfire_cee_trap:
135 ldxa [%g0] ASI_AFSR, %g4 ! Get AFSR
136 mov 1, %g3
137 sllx %g3, SFAFSR_UE_SHIFT, %g3
138 andcc %g4, %g3, %g0 ! Check for UE
139 bne,pn %xcc, __spitfire_access_error
140 nop
141
142 /* Ok, in this case we only have a correctable error.
143 * Indicate we only wish to capture that state in register
144 * %g1, and we only disable CE error reporting unlike UE
145 * handling which disables all errors.
146 */
147 ldxa [%g0] ASI_ESTATE_ERROR_EN, %g3
148 andn %g3, ESTATE_ERR_CE, %g3
149 stxa %g3, [%g0] ASI_ESTATE_ERROR_EN
150 membar #Sync
151
152 /* Preserve AFSR in %g4, indicate UDB state to capture in %g1 */
153 ba,pt %xcc, __spitfire_cee_trap_continue
154 mov UDBE_CE, %g1
155 .size __spitfire_cee_trap,.-__spitfire_cee_trap
156
157 .type __spitfire_data_access_exception_tl1,#function
158__spitfire_data_access_exception_tl1:
159 rdpr %pstate, %g4
160 wrpr %g4, PSTATE_MG|PSTATE_AG, %pstate
161 mov TLB_SFSR, %g3
162 mov DMMU_SFAR, %g5
163 ldxa [%g3] ASI_DMMU, %g4 ! Get SFSR
164 ldxa [%g5] ASI_DMMU, %g5 ! Get SFAR
165 stxa %g0, [%g3] ASI_DMMU ! Clear SFSR.FaultValid bit
166 membar #Sync
167 rdpr %tt, %g3
168 cmp %g3, 0x80 ! first win spill/fill trap
169 blu,pn %xcc, 1f
170 cmp %g3, 0xff ! last win spill/fill trap
171 bgu,pn %xcc, 1f
172 nop
173 ba,pt %xcc, winfix_dax
174 rdpr %tpc, %g3
1751: sethi %hi(109f), %g7
176 ba,pt %xcc, etraptl1
177109: or %g7, %lo(109b), %g7
178 mov %l4, %o1
179 mov %l5, %o2
180 call spitfire_data_access_exception_tl1
181 add %sp, PTREGS_OFF, %o0
182 ba,pt %xcc, rtrap
183 nop
184 .size __spitfire_data_access_exception_tl1,.-__spitfire_data_access_exception_tl1
185
186 .type __spitfire_data_access_exception,#function
187__spitfire_data_access_exception:
188 rdpr %pstate, %g4
189 wrpr %g4, PSTATE_MG|PSTATE_AG, %pstate
190 mov TLB_SFSR, %g3
191 mov DMMU_SFAR, %g5
192 ldxa [%g3] ASI_DMMU, %g4 ! Get SFSR
193 ldxa [%g5] ASI_DMMU, %g5 ! Get SFAR
194 stxa %g0, [%g3] ASI_DMMU ! Clear SFSR.FaultValid bit
195 membar #Sync
196 sethi %hi(109f), %g7
197 ba,pt %xcc, etrap
198109: or %g7, %lo(109b), %g7
199 mov %l4, %o1
200 mov %l5, %o2
201 call spitfire_data_access_exception
202 add %sp, PTREGS_OFF, %o0
203 ba,pt %xcc, rtrap
204 nop
205 .size __spitfire_data_access_exception,.-__spitfire_data_access_exception
206
207 .type __spitfire_insn_access_exception_tl1,#function
208__spitfire_insn_access_exception_tl1:
209 rdpr %pstate, %g4
210 wrpr %g4, PSTATE_MG|PSTATE_AG, %pstate
211 mov TLB_SFSR, %g3
212 ldxa [%g3] ASI_IMMU, %g4 ! Get SFSR
213 rdpr %tpc, %g5 ! IMMU has no SFAR, use TPC
214 stxa %g0, [%g3] ASI_IMMU ! Clear FaultValid bit
215 membar #Sync
216 sethi %hi(109f), %g7
217 ba,pt %xcc, etraptl1
218109: or %g7, %lo(109b), %g7
219 mov %l4, %o1
220 mov %l5, %o2
221 call spitfire_insn_access_exception_tl1
222 add %sp, PTREGS_OFF, %o0
223 ba,pt %xcc, rtrap
224 nop
225 .size __spitfire_insn_access_exception_tl1,.-__spitfire_insn_access_exception_tl1
226
227 .type __spitfire_insn_access_exception,#function
228__spitfire_insn_access_exception:
229 rdpr %pstate, %g4
230 wrpr %g4, PSTATE_MG|PSTATE_AG, %pstate
231 mov TLB_SFSR, %g3
232 ldxa [%g3] ASI_IMMU, %g4 ! Get SFSR
233 rdpr %tpc, %g5 ! IMMU has no SFAR, use TPC
234 stxa %g0, [%g3] ASI_IMMU ! Clear FaultValid bit
235 membar #Sync
236 sethi %hi(109f), %g7
237 ba,pt %xcc, etrap
238109: or %g7, %lo(109b), %g7
239 mov %l4, %o1
240 mov %l5, %o2
241 call spitfire_insn_access_exception
242 add %sp, PTREGS_OFF, %o0
243 ba,pt %xcc, rtrap
244 nop
245 .size __spitfire_insn_access_exception,.-__spitfire_insn_access_exception
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