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authorKeith Owens <kaos@sgi.com>2005-09-11 03:22:53 -0400
committerTony Luck <tony.luck@intel.com>2005-09-11 17:08:41 -0400
commit7f613c7d2203ae137d98fc1c38abc30fd7048637 (patch)
treed8155a5cca33e4fe178625396886fcbb81f39e7a /include/asm-ia64
parent289d773ee89ea80dcc364ef97d1be7ad1817387e (diff)
[PATCH] MCA/INIT: use per cpu stacks
The bulk of the change. Use per cpu MCA/INIT stacks. Change the SAL to OS state (sos) to be per process. Do all the assembler work on the MCA/INIT stacks, leaving the original stack alone. Pass per cpu state data to the C handlers for MCA and INIT, which also means changing the mca_drv interfaces slightly. Lots of verification on whether the original stack is usable before converting it to a sleeping process. Signed-off-by: Keith Owens <kaos@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'include/asm-ia64')
-rw-r--r--include/asm-ia64/mca.h102
-rw-r--r--include/asm-ia64/mca_asm.h125
2 files changed, 91 insertions, 136 deletions
diff --git a/include/asm-ia64/mca.h b/include/asm-ia64/mca.h
index 149ad0118455..97a28b8b2ddd 100644
--- a/include/asm-ia64/mca.h
+++ b/include/asm-ia64/mca.h
@@ -11,8 +11,6 @@
11#ifndef _ASM_IA64_MCA_H 11#ifndef _ASM_IA64_MCA_H
12#define _ASM_IA64_MCA_H 12#define _ASM_IA64_MCA_H
13 13
14#define IA64_MCA_STACK_SIZE 8192
15
16#if !defined(__ASSEMBLY__) 14#if !defined(__ASSEMBLY__)
17 15
18#include <linux/interrupt.h> 16#include <linux/interrupt.h>
@@ -48,7 +46,8 @@ typedef union cmcv_reg_u {
48 46
49enum { 47enum {
50 IA64_MCA_RENDEZ_CHECKIN_NOTDONE = 0x0, 48 IA64_MCA_RENDEZ_CHECKIN_NOTDONE = 0x0,
51 IA64_MCA_RENDEZ_CHECKIN_DONE = 0x1 49 IA64_MCA_RENDEZ_CHECKIN_DONE = 0x1,
50 IA64_MCA_RENDEZ_CHECKIN_INIT = 0x2,
52}; 51};
53 52
54/* Information maintained by the MC infrastructure */ 53/* Information maintained by the MC infrastructure */
@@ -63,18 +62,42 @@ typedef struct ia64_mc_info_s {
63 62
64} ia64_mc_info_t; 63} ia64_mc_info_t;
65 64
66typedef struct ia64_mca_sal_to_os_state_s { 65/* Handover state from SAL to OS and vice versa, for both MCA and INIT events.
67 u64 imsto_os_gp; /* GP of the os registered with the SAL */ 66 * Besides the handover state, it also contains some saved registers from the
68 u64 imsto_pal_proc; /* PAL_PROC entry point - physical addr */ 67 * time of the event.
69 u64 imsto_sal_proc; /* SAL_PROC entry point - physical addr */ 68 * Note: mca_asm.S depends on the precise layout of this structure.
70 u64 imsto_sal_gp; /* GP of the SAL - physical */ 69 */
71 u64 imsto_rendez_state; /* Rendez state information */ 70
72 u64 imsto_sal_check_ra; /* Return address in SAL_CHECK while going 71struct ia64_sal_os_state {
73 * back to SAL from OS after MCA handling. 72 /* SAL to OS, must be at offset 0 */
74 */ 73 u64 os_gp; /* GP of the os registered with the SAL, physical */
75 u64 pal_min_state; /* from PAL in r17 */ 74 u64 pal_proc; /* PAL_PROC entry point, physical */
76 u64 proc_state_param; /* from PAL in r18. See SDV 2:268 11.3.2.1 */ 75 u64 sal_proc; /* SAL_PROC entry point, physical */
77} ia64_mca_sal_to_os_state_t; 76 u64 rv_rc; /* MCA - Rendezvous state, INIT - reason code */
77 u64 proc_state_param; /* from R18 */
78 u64 monarch; /* 1 for a monarch event, 0 for a slave */
79 /* common, must follow SAL to OS */
80 u64 sal_ra; /* Return address in SAL, physical */
81 u64 sal_gp; /* GP of the SAL - physical */
82 pal_min_state_area_t *pal_min_state; /* from R17. physical in asm, virtual in C */
83 u64 prev_IA64_KR_CURRENT; /* previous value of IA64_KR(CURRENT) */
84 struct task_struct *prev_task; /* previous task, NULL if it is not useful */
85 /* Some interrupt registers are not saved in minstate, pt_regs or
86 * switch_stack. Because MCA/INIT can occur when interrupts are
87 * disabled, we need to save the additional interrupt registers over
88 * MCA/INIT and resume.
89 */
90 u64 isr;
91 u64 ifa;
92 u64 itir;
93 u64 iipa;
94 u64 iim;
95 u64 iha;
96 /* OS to SAL, must follow common */
97 u64 os_status; /* OS status to SAL, enum below */
98 u64 context; /* 0 if return to same context
99 1 if return to new context */
100};
78 101
79enum { 102enum {
80 IA64_MCA_CORRECTED = 0x0, /* Error has been corrected by OS_MCA */ 103 IA64_MCA_CORRECTED = 0x0, /* Error has been corrected by OS_MCA */
@@ -84,35 +107,21 @@ enum {
84}; 107};
85 108
86enum { 109enum {
110 IA64_INIT_RESUME = 0x0, /* Resume after return from INIT */
111 IA64_INIT_WARM_BOOT = -1, /* Warm boot of the system need from SAL */
112};
113
114enum {
87 IA64_MCA_SAME_CONTEXT = 0x0, /* SAL to return to same context */ 115 IA64_MCA_SAME_CONTEXT = 0x0, /* SAL to return to same context */
88 IA64_MCA_NEW_CONTEXT = -1 /* SAL to return to new context */ 116 IA64_MCA_NEW_CONTEXT = -1 /* SAL to return to new context */
89}; 117};
90 118
91typedef struct ia64_mca_os_to_sal_state_s {
92 u64 imots_os_status; /* OS status to SAL as to what happened
93 * with the MCA handling.
94 */
95 u64 imots_sal_gp; /* GP of the SAL - physical */
96 u64 imots_context; /* 0 if return to same context
97 1 if return to new context */
98 u64 *imots_new_min_state; /* Pointer to structure containing
99 * new values of registers in the min state
100 * save area.
101 */
102 u64 imots_sal_check_ra; /* Return address in SAL_CHECK while going
103 * back to SAL from OS after MCA handling.
104 */
105} ia64_mca_os_to_sal_state_t;
106
107/* Per-CPU MCA state that is too big for normal per-CPU variables. */ 119/* Per-CPU MCA state that is too big for normal per-CPU variables. */
108 120
109struct ia64_mca_cpu { 121struct ia64_mca_cpu {
110 u64 stack[IA64_MCA_STACK_SIZE/8]; /* MCA memory-stack */ 122 u64 mca_stack[KERNEL_STACK_SIZE/8];
111 u64 proc_state_dump[512];
112 u64 stackframe[32];
113 u64 rbstore[IA64_MCA_STACK_SIZE/8]; /* MCA reg.-backing store */
114 u64 init_stack[KERNEL_STACK_SIZE/8]; 123 u64 init_stack[KERNEL_STACK_SIZE/8];
115} __attribute__ ((aligned(16))); 124};
116 125
117/* Array of physical addresses of each CPU's MCA area. */ 126/* Array of physical addresses of each CPU's MCA area. */
118extern unsigned long __per_cpu_mca[NR_CPUS]; 127extern unsigned long __per_cpu_mca[NR_CPUS];
@@ -121,12 +130,29 @@ extern void ia64_mca_init(void);
121extern void ia64_mca_cpu_init(void *); 130extern void ia64_mca_cpu_init(void *);
122extern void ia64_os_mca_dispatch(void); 131extern void ia64_os_mca_dispatch(void);
123extern void ia64_os_mca_dispatch_end(void); 132extern void ia64_os_mca_dispatch_end(void);
124extern void ia64_mca_ucmc_handler(void); 133extern void ia64_mca_ucmc_handler(struct pt_regs *, struct ia64_sal_os_state *);
134extern void ia64_init_handler(struct pt_regs *,
135 struct switch_stack *,
136 struct ia64_sal_os_state *);
125extern void ia64_monarch_init_handler(void); 137extern void ia64_monarch_init_handler(void);
126extern void ia64_slave_init_handler(void); 138extern void ia64_slave_init_handler(void);
127extern void ia64_mca_cmc_vector_setup(void); 139extern void ia64_mca_cmc_vector_setup(void);
128extern int ia64_reg_MCA_extension(void*); 140extern int ia64_reg_MCA_extension(int (*fn)(void *, struct ia64_sal_os_state *));
129extern void ia64_unreg_MCA_extension(void); 141extern void ia64_unreg_MCA_extension(void);
142extern u64 ia64_get_rnat(u64 *);
143
144#else /* __ASSEMBLY__ */
145
146#define IA64_MCA_CORRECTED 0x0 /* Error has been corrected by OS_MCA */
147#define IA64_MCA_WARM_BOOT -1 /* Warm boot of the system need from SAL */
148#define IA64_MCA_COLD_BOOT -2 /* Cold boot of the system need from SAL */
149#define IA64_MCA_HALT -3 /* System to be halted by SAL */
150
151#define IA64_INIT_RESUME 0x0 /* Resume after return from INIT */
152#define IA64_INIT_WARM_BOOT -1 /* Warm boot of the system need from SAL */
153
154#define IA64_MCA_SAME_CONTEXT 0x0 /* SAL to return to same context */
155#define IA64_MCA_NEW_CONTEXT -1 /* SAL to return to new context */
130 156
131#endif /* !__ASSEMBLY__ */ 157#endif /* !__ASSEMBLY__ */
132#endif /* _ASM_IA64_MCA_H */ 158#endif /* _ASM_IA64_MCA_H */
diff --git a/include/asm-ia64/mca_asm.h b/include/asm-ia64/mca_asm.h
index 836953e0f91f..27c9203d8ce3 100644
--- a/include/asm-ia64/mca_asm.h
+++ b/include/asm-ia64/mca_asm.h
@@ -8,6 +8,8 @@
8 * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com> 8 * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
9 * Copyright (C) 2002 Intel Corp. 9 * Copyright (C) 2002 Intel Corp.
10 * Copyright (C) 2002 Jenna Hall <jenna.s.hall@intel.com> 10 * Copyright (C) 2002 Jenna Hall <jenna.s.hall@intel.com>
11 * Copyright (C) 2005 Silicon Graphics, Inc
12 * Copyright (C) 2005 Keith Owens <kaos@sgi.com>
11 */ 13 */
12#ifndef _ASM_IA64_MCA_ASM_H 14#ifndef _ASM_IA64_MCA_ASM_H
13#define _ASM_IA64_MCA_ASM_H 15#define _ASM_IA64_MCA_ASM_H
@@ -207,106 +209,33 @@
207 ;; 209 ;;
208 210
209/* 211/*
210 * The following offsets capture the order in which the 212 * The MCA and INIT stacks in struct ia64_mca_cpu look like normal kernel
211 * RSE related registers from the old context are 213 * stacks, except that the SAL/OS state and a switch_stack are stored near the
212 * saved onto the new stack frame. 214 * top of the MCA/INIT stack. To support concurrent entry to MCA or INIT, as
215 * well as MCA over INIT, each event needs its own SAL/OS state. All entries
216 * are 16 byte aligned.
213 * 217 *
214 * +-----------------------+ 218 * +---------------------------+
215 * |NDIRTY [BSP - BSPSTORE]| 219 * | pt_regs |
216 * +-----------------------+ 220 * +---------------------------+
217 * | RNAT | 221 * | switch_stack |
218 * +-----------------------+ 222 * +---------------------------+
219 * | BSPSTORE | 223 * | SAL/OS state |
220 * +-----------------------+ 224 * +---------------------------+
221 * | IFS | 225 * | 16 byte scratch area |
222 * +-----------------------+ 226 * +---------------------------+ <-------- SP at start of C MCA handler
223 * | PFS | 227 * | ..... |
224 * +-----------------------+ 228 * +---------------------------+
225 * | RSC | 229 * | RBS for MCA/INIT handler |
226 * +-----------------------+ <-------- Bottom of new stack frame 230 * +---------------------------+
231 * | struct task for MCA/INIT |
232 * +---------------------------+ <-------- Bottom of MCA/INIT stack
227 */ 233 */
228#define rse_rsc_offset 0
229#define rse_pfs_offset (rse_rsc_offset+0x08)
230#define rse_ifs_offset (rse_pfs_offset+0x08)
231#define rse_bspstore_offset (rse_ifs_offset+0x08)
232#define rse_rnat_offset (rse_bspstore_offset+0x08)
233#define rse_ndirty_offset (rse_rnat_offset+0x08)
234 234
235/* 235#define ALIGN16(x) ((x)&~15)
236 * rse_switch_context 236#define MCA_PT_REGS_OFFSET ALIGN16(KERNEL_STACK_SIZE-IA64_PT_REGS_SIZE)
237 * 237#define MCA_SWITCH_STACK_OFFSET ALIGN16(MCA_PT_REGS_OFFSET-IA64_SWITCH_STACK_SIZE)
238 * 1. Save old RSC onto the new stack frame 238#define MCA_SOS_OFFSET ALIGN16(MCA_SWITCH_STACK_OFFSET-IA64_SAL_OS_STATE_SIZE)
239 * 2. Save PFS onto new stack frame 239#define MCA_SP_OFFSET ALIGN16(MCA_SOS_OFFSET-16)
240 * 3. Cover the old frame and start a new frame.
241 * 4. Save IFS onto new stack frame
242 * 5. Save the old BSPSTORE on the new stack frame
243 * 6. Save the old RNAT on the new stack frame
244 * 7. Write BSPSTORE with the new backing store pointer
245 * 8. Read and save the new BSP to calculate the #dirty registers
246 * NOTE: Look at pages 11-10, 11-11 in PRM Vol 2
247 */
248#define rse_switch_context(temp,p_stackframe,p_bspstore) \
249 ;; \
250 mov temp=ar.rsc;; \
251 st8 [p_stackframe]=temp,8;; \
252 mov temp=ar.pfs;; \
253 st8 [p_stackframe]=temp,8; \
254 cover ;; \
255 mov temp=cr.ifs;; \
256 st8 [p_stackframe]=temp,8;; \
257 mov temp=ar.bspstore;; \
258 st8 [p_stackframe]=temp,8;; \
259 mov temp=ar.rnat;; \
260 st8 [p_stackframe]=temp,8; \
261 mov ar.bspstore=p_bspstore;; \
262 mov temp=ar.bsp;; \
263 sub temp=temp,p_bspstore;; \
264 st8 [p_stackframe]=temp,8;;
265
266/*
267 * rse_return_context
268 * 1. Allocate a zero-sized frame
269 * 2. Store the number of dirty registers RSC.loadrs field
270 * 3. Issue a loadrs to insure that any registers from the interrupted
271 * context which were saved on the new stack frame have been loaded
272 * back into the stacked registers
273 * 4. Restore BSPSTORE
274 * 5. Restore RNAT
275 * 6. Restore PFS
276 * 7. Restore IFS
277 * 8. Restore RSC
278 * 9. Issue an RFI
279 */
280#define rse_return_context(psr_mask_reg,temp,p_stackframe) \
281 ;; \
282 alloc temp=ar.pfs,0,0,0,0; \
283 add p_stackframe=rse_ndirty_offset,p_stackframe;; \
284 ld8 temp=[p_stackframe];; \
285 shl temp=temp,16;; \
286 mov ar.rsc=temp;; \
287 loadrs;; \
288 add p_stackframe=-rse_ndirty_offset+rse_bspstore_offset,p_stackframe;;\
289 ld8 temp=[p_stackframe];; \
290 mov ar.bspstore=temp;; \
291 add p_stackframe=-rse_bspstore_offset+rse_rnat_offset,p_stackframe;;\
292 ld8 temp=[p_stackframe];; \
293 mov ar.rnat=temp;; \
294 add p_stackframe=-rse_rnat_offset+rse_pfs_offset,p_stackframe;; \
295 ld8 temp=[p_stackframe];; \
296 mov ar.pfs=temp;; \
297 add p_stackframe=-rse_pfs_offset+rse_ifs_offset,p_stackframe;; \
298 ld8 temp=[p_stackframe];; \
299 mov cr.ifs=temp;; \
300 add p_stackframe=-rse_ifs_offset+rse_rsc_offset,p_stackframe;; \
301 ld8 temp=[p_stackframe];; \
302 mov ar.rsc=temp ; \
303 mov temp=psr;; \
304 or temp=temp,psr_mask_reg;; \
305 mov cr.ipsr=temp;; \
306 mov temp=ip;; \
307 add temp=0x30,temp;; \
308 mov cr.iip=temp;; \
309 srlz.i;; \
310 rfi;;
311 240
312#endif /* _ASM_IA64_MCA_ASM_H */ 241#endif /* _ASM_IA64_MCA_ASM_H */
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