[PATCH] ia64: mca logging bug fixes

I've attached a version of Jenna Hall's mca logging fixes,
updated for 2.5.45.  Jenna listed the benefits as:

1.      Simplifies and fixes date reporting during MCA log printing
        (patch from Matthew Wilcox)
2.      Fixes nested MCA handling
3.      Fixes clearing of fatal error records from SAL logs upon reboot
4.      Fixes returning the PAL min-state address upon return from OS_MCA

Item #1 was already in 2.5.45.

In addition to Jenna's changes, I deleted some unused debug code
(and associated data min_state_labels[]), and dropped the
#warning about save_and_cli() that you had added.

arch/ia64/kernel/mca.c

@@ -69,10 +69,10 @@ u64				ia64_mca_stackframe[32];
 u64				ia64_mca_bspstore[1024];
 u64				ia64_init_stack[KERNEL_STACK_SIZE] __attribute__((aligned(16)));
 u64				ia64_mca_sal_data_area[1356];
-u64				ia64_mca_min_state_save_info;
 u64				ia64_tlb_functional;
 u64				ia64_os_mca_recovery_successful;
-
+/* TODO: need to assign min-state structure to UC memory */
+u64				ia64_mca_min_state_save_info[MIN_STATE_AREA_SIZE] __attribute__((aligned(512)));
 static void			ia64_mca_wakeup_ipi_wait(void);
 static void			ia64_mca_wakeup(int cpu);
 static void			ia64_mca_wakeup_all(void);
@@ -116,7 +116,7 @@ static struct irqaction mca_cpe_irqaction = {
  *  Outputs :   platform error status
  */
 int
-ia64_mca_log_sal_error_record(int sal_info_type)
+ia64_mca_log_sal_error_record(int sal_info_type, int called_from_init)
 {
 	int platform_err = 0;
 
@@ -131,6 +131,9 @@ ia64_mca_log_sal_error_record(int sal_info_type)
 	 */
 
 	platform_err = ia64_log_print(sal_info_type, (prfunc_t)printk);
+	/* temporary: only clear SAL logs on hardware-corrected errors
+		or if we're logging an error after an MCA-initiated reboot */
+	if ((sal_info_type > 1) || (called_from_init))
 		ia64_sal_clear_state_info(sal_info_type);
 
 	return platform_err;
@@ -152,7 +155,7 @@ ia64_mca_cpe_int_handler (int cpe_irq, void *arg, struct pt_regs *ptregs)
 	IA64_MCA_DEBUG("ia64_mca_cpe_int_handler: received interrupt. vector = %#x\n", cpe_irq);
 
 	/* Get the CMC error record and log it */
-	ia64_mca_log_sal_error_record(SAL_INFO_TYPE_CPE);
+	ia64_mca_log_sal_error_record(SAL_INFO_TYPE_CPE, 0);
 }
 
 /*
@@ -199,13 +202,15 @@ ia64_mca_init_platform (void)
  *
  *  Outputs :   None
  */
-void
+int
 ia64_mca_check_errors (void)
 {
 	/*
 	 *  If there is an MCA error record pending, get it and log it.
 	 */
-	ia64_mca_log_sal_error_record(SAL_INFO_TYPE_MCA);
+	ia64_mca_log_sal_error_record(SAL_INFO_TYPE_MCA, 1);
+
+	return 0;
 }
 
 device_initcall(ia64_mca_check_errors);
@@ -237,49 +242,26 @@ ia64_mca_register_cpev (int cpev)
 
 #endif /* PLATFORM_MCA_HANDLERS */
 
-static char *min_state_labels[] = {
-	"nat",
-	"r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8",
-	"r9", "r10","r11", "r12","r13","r14", "r15",
-	"b0r16","b0r17", "b0r18", "b0r19", "b0r20",
-	"b0r21", "b0r22","b0r23", "b0r24", "b0r25",
-	"b0r26", "b0r27", "b0r28","b0r29", "b0r30", "b0r31",
-	"r16", "r17", "r18","r19", "r20", "r21","r22",
-	"r23", "r24","r25", "r26", "r27","r28", "r29", "r30","r31",
-	"preds", "br0", "rsc",
-	"iip", "ipsr", "ifs",
-	"xip", "xpsr", "xfs"
-};
-
-int ia64_pmss_dump_bank0=0;  /* dump bank 0 ? */
-
 /*
  * routine to process and prepare to dump min_state_save
  * information for debugging purposes.
  *
  */
 void
-ia64_process_min_state_save (pal_min_state_area_t *pmss, struct pt_regs *ptregs)
+ia64_process_min_state_save (pal_min_state_area_t *pmss)
 {
-	int i, max=57;
-	u64 *tpmss_ptr=(u64 *)pmss;
+	int i, max = MIN_STATE_AREA_SIZE;
+	u64 *tpmss_ptr = (u64 *)pmss;
+	u64 *return_min_state_ptr = ia64_mca_min_state_save_info;
 
 	/* dump out the min_state_area information */
 
 	for (i=0;i<max;i++) {
 
-		if(!ia64_pmss_dump_bank0) {
-			if(strncmp("B0",min_state_labels[i],2)==0) {
-				tpmss_ptr++;  /* skip to next entry */
-				continue;
-			}
-		}
-
-		printk("%5s=0x%16.16lx ",min_state_labels[i],*tpmss_ptr++);
+		/* copy min-state register info for eventual return to PAL */
+		*return_min_state_ptr++ = *tpmss_ptr;
 
-		if (((i+1)%3)==0 || ((!strcmp("GR16",min_state_labels[i]))
-				     && !ia64_pmss_dump_bank0))
-			printk("\n");
+		tpmss_ptr++;  /* skip to next entry */
 	}
 }
 
@@ -525,19 +507,17 @@ ia64_mca_init(void)
 	ia64_log_init(SAL_INFO_TYPE_CMC);
 	ia64_log_init(SAL_INFO_TYPE_CPE);
 
-	/* Zero the min state save info */
-	ia64_mca_min_state_save_info = 0;
-
 #if defined(MCA_TEST)
 	mca_test();
 #endif /* #if defined(MCA_TEST) */
 
 	printk("Mca related initialization done\n");
 
-#if 0   // Too early in initialization -- error log is lost
+	/* commented out because this is done elsewhere */
+#if 0
 	/* Do post-failure MCA error logging */
 	ia64_mca_check_errors();
-#endif  // Too early in initialization -- error log is lost
+#endif
 }
 
 /*
@@ -632,7 +612,6 @@ ia64_mca_rendez_int_handler(int rendez_irq, void *arg, struct pt_regs *ptregs)
 	int cpu = 0;
 
 	/* Mask all interrupts */
-#warning XXX fix me: this used to be: save_and_cli(flags);
 	local_irq_save(flags);
 
 #ifdef CONFIG_SMP
@@ -709,8 +688,8 @@ ia64_return_to_sal_check(void)
 	ia64_os_to_sal_handoff_state.imots_context = IA64_MCA_SAME_CONTEXT;
 
 	/* Register pointer to new min state values */
-	/* NOTE: need to do something with this during recovery phase */
-	ia64_os_to_sal_handoff_state.imots_new_min_state = &ia64_mca_min_state_save_info;
+	ia64_os_to_sal_handoff_state.imots_new_min_state =
+		ia64_mca_min_state_save_info;
 }
 
 /*
@@ -735,7 +714,7 @@ ia64_mca_ucmc_handler(void)
 	int platform_err = 0;
 
 	/* Get the MCA error record and log it */
-	platform_err = ia64_mca_log_sal_error_record(SAL_INFO_TYPE_MCA);
+	platform_err = ia64_mca_log_sal_error_record(SAL_INFO_TYPE_MCA, 0);
 
 	/*
 	 *  Do Platform-specific mca error handling if required.
@@ -775,7 +754,7 @@ ia64_mca_cmc_int_handler(int cmc_irq, void *arg, struct pt_regs *ptregs)
 		       cmc_irq, smp_processor_id());
 
 	/* Get the CMC error record and log it */
-	ia64_mca_log_sal_error_record(SAL_INFO_TYPE_CMC);
+	ia64_mca_log_sal_error_record(SAL_INFO_TYPE_CMC, 0);
 }
 
 /*
@@ -845,8 +824,7 @@ ia64_init_handler (struct pt_regs *regs)
 	plog_ptr=(ia64_err_rec_t *)IA64_LOG_CURR_BUFFER(SAL_INFO_TYPE_INIT);
 	proc_ptr = &plog_ptr->proc_err;
 
-	ia64_process_min_state_save(&proc_ptr->processor_static_info.min_state_area,
-				    regs);
+	ia64_process_min_state_save(&proc_ptr->processor_static_info.min_state_area);
 
 	/* Clear the INIT SAL logs now that they have been saved in the OS buffer */
 	ia64_sal_clear_state_info(SAL_INFO_TYPE_INIT);
@@ -1677,6 +1655,9 @@ ia64_log_proc_dev_err_info_print (sal_log_processor_info_t  *slpi,
 	if (slpi->valid.psi_static_struct) {
 		spsi = (sal_processor_static_info_t *)p_data;
 
+		/* copy interrupted context PAL min-state info */
+		ia64_process_min_state_save(&spsi->min_state_area);
+
 		/* Print branch register contents if valid */
 		if (spsi->valid.br)
 			ia64_log_processor_regs_print(spsi->br, 8, "Branch", "br",

arch/ia64/pci/pci.c

@@ -44,10 +44,6 @@
 #define DBG(x...)
 #endif
 
-#ifdef CONFIG_IA64_MCA
-extern void ia64_mca_check_errors( void );
-#endif
-
 struct pci_fixup pcibios_fixups[1];
 
 /*

include/asm-ia64/mca.h

@@ -103,6 +103,8 @@ enum {
 	IA64_MCA_NEW_CONTEXT	=	-1	/* SAL to return to new context */
 };
 
+#define MIN_STATE_AREA_SIZE     57
+
 typedef struct ia64_mca_os_to_sal_state_s {
 	u64		imots_os_status;	/*   OS status to SAL as to what happened
 						 *   with the MCA handling.
@@ -133,7 +135,7 @@ extern void ia64_mca_cmc_int_handler(int,void *,struct pt_regs *);
 extern void ia64_mca_cpe_int_handler(int,void *,struct pt_regs *);
 extern int  ia64_log_print(int,prfunc_t);
 extern void ia64_mca_cmc_vector_setup(void);
-extern void ia64_mca_check_errors( void );
+extern int  ia64_mca_check_errors(void);
 extern u64  ia64_log_get(int, prfunc_t);
 
 #define PLATFORM_CALL(fn, args)	printk("Platform call TBD\n")

include/asm-ia64/mca_asm.h

@@ -16,6 +16,7 @@
 #define PSR_I		14
 #define	PSR_DT		17
 #define PSR_RT		27
+#define PSR_MC		35
 #define PSR_IT		36
 #define PSR_BN		44
 
@@ -107,6 +108,8 @@
 	;;										\
 	dep	temp1 = 0, temp1, PSR_IC, 1;						\
 	;;										\
+	dep	temp1 = -1, temp1, PSR_MC, 1;						\
+	;;										\
 	movl	temp2 = start_addr;							\
 	mov	cr.ipsr = temp1;							\
 	;;										\