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authorRobin Getz <robin.getz@analog.com>2008-01-27 15:38:56 +0800
committerBryan Wu <bryan.wu@analog.com>2008-01-27 15:38:56 +0800
commit13fe24f37df20e580a5a364e67ec8cf3219d8f8c (patch)
treec790da8a840c6fdc3e6f5eacccadede92e329d7c /arch/blackfin/mach-common
parentf53e86760e10abbe7ee98a5b3cb270fa6426fcdb (diff)
[Blackfin] arch: fix bug - trap_tests fails to recover on some tests.
http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=3719 When the CPLBs get a miss, we do: - find a victim in the HW table - remove the victim - find the replacement in the software table - put it into the HW table. If we can't find a replacement in the software table, we accidently leave a duplicate in the HW table. This patch ensures that duplicate is marked as not valid. What we should do is find the replacement in the software table, before we find a victim in the HW table - but its too late in the release cycle to do that much restructuring of this code. Rather that duplicate code, connect Hardware Errors (irq5) into trap_c, so user space processes get killed properly. The rest of irq_panic() can be moved into traps.c (later) There is still a small corner case that causes problems when a pheriperal interrupt goes off a single cycle before a user space hardware error. This causes a kernel panic, rather than the user space process being killed. But, this checkin makes things work in 99.9% of the cases, and is a vast improvement from what is there today (which fails 100% of the time). Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Diffstat (limited to 'arch/blackfin/mach-common')
-rw-r--r--arch/blackfin/mach-common/cplbmgr.S22
-rw-r--r--arch/blackfin/mach-common/interrupt.S40
-rw-r--r--arch/blackfin/mach-common/irqpanic.c50
3 files changed, 49 insertions, 63 deletions
diff --git a/arch/blackfin/mach-common/cplbmgr.S b/arch/blackfin/mach-common/cplbmgr.S
index faca1ab344d..f5cf3accef3 100644
--- a/arch/blackfin/mach-common/cplbmgr.S
+++ b/arch/blackfin/mach-common/cplbmgr.S
@@ -190,7 +190,14 @@ ENTRY(_cplb_mgr)
[P0 - 4] = R0;
R0 = [P0 - 0x100];
[P0-0x104] = R0;
-.Lie_move:P0+=4;
+.Lie_move:
+ P0+=4;
+
+ /* Clear ICPLB_DATA15, in case we don't find a replacement
+ * otherwise, we would have a duplicate entry, and will crash
+ */
+ R0 = 0;
+ [P0 - 4] = R0;
/* We've made space in the ICPLB table, so that ICPLB15
* is now free to be overwritten. Next, we have to determine
@@ -515,14 +522,23 @@ ENTRY(_cplb_mgr)
R0 = [P0++]; /* move data */
[P0 - 8] = R0;
R0 = [P0-0x104] /* move address */
-.Lde_move: [P0-0x108] = R0;
+.Lde_move:
+ [P0-0x108] = R0;
+
+.Lde_moved:
+ NOP;
+
+ /* Clear DCPLB_DATA15, in case we don't find a replacement
+ * otherwise, we would have a duplicate entry, and will crash
+ */
+ R0 = 0;
+ [P0 - 0x4] = R0;
/* We've now made space in DCPLB15 for the new CPLB to be
* installed. The next stage is to locate a CPLB in the
* config table that covers the faulting address.
*/
-.Lde_moved:NOP;
R0 = I0; /* Our faulting address */
P2.L = _dpdt_table;
diff --git a/arch/blackfin/mach-common/interrupt.S b/arch/blackfin/mach-common/interrupt.S
index 4de376418a1..f983ac7ea35 100644
--- a/arch/blackfin/mach-common/interrupt.S
+++ b/arch/blackfin/mach-common/interrupt.S
@@ -34,9 +34,13 @@
#include <asm/entry.h>
#include <asm/asm-offsets.h>
#include <asm/trace.h>
+#include <asm/traps.h>
+#include <asm/thread_info.h>
#include <asm/mach-common/context.S>
+.extern _ret_from_exception
+
#ifdef CONFIG_I_ENTRY_L1
.section .l1.text
#else
@@ -134,10 +138,11 @@ __common_int_entry:
/* interrupt routine for ivhw - 5 */
ENTRY(_evt_ivhw)
- SAVE_CONTEXT
+ SAVE_ALL_SYS
#ifdef CONFIG_FRAME_POINTER
fp = 0;
#endif
+
#if ANOMALY_05000283
cc = r7 == r7;
p5.h = 0xffc0;
@@ -147,13 +152,8 @@ ENTRY(_evt_ivhw)
1:
#endif
- trace_buffer_stop(p0, r0);
-
- r0 = IRQ_HWERR;
- r1 = sp;
-
#ifdef CONFIG_HARDWARE_PM
- r7 = SEQSTAT;
+ r7 = [sp + PT_SEQSTAT];
r7 = r7 >>> 0xe;
r6 = 0x1F;
r7 = r7 & r6;
@@ -161,11 +161,29 @@ ENTRY(_evt_ivhw)
cc = r7 == r5;
if cc jump .Lcall_do_ovf; /* deal with performance counter overflow */
#endif
-
+ # We are going to dump something out, so make sure we print IPEND properly
+ p2.l = lo(IPEND);
+ p2.h = hi(IPEND);
+ r0 = [p2];
+ [sp + PT_IPEND] = r0;
+
+ /* set the EXCAUSE to HWERR for trap_c */
+ r0 = [sp + PT_SEQSTAT];
+ R1.L = LO(VEC_HWERR);
+ R1.H = HI(VEC_HWERR);
+ R0 = R0 | R1;
+ [sp + PT_SEQSTAT] = R0;
+
+ r0 = sp; /* stack frame pt_regs pointer argument ==> r0 */
SP += -12;
- call _irq_panic;
+ call _trap_c;
SP += 12;
+
+ call _ret_from_exception;
+.Lcommon_restore_all_sys:
+ RESTORE_ALL_SYS
rti;
+
#ifdef CONFIG_HARDWARE_PM
.Lcall_do_ovf:
@@ -173,9 +191,11 @@ ENTRY(_evt_ivhw)
call _pm_overflow;
SP += 12;
- jump .Lcommon_restore_context;
+ jump .Lcommon_restore_all_sys;
#endif
+ENDPROC(_evt_ivhw)
+
/* Interrupt routine for evt2 (NMI).
* We don't actually use this, so just return.
* For inner circle type details, please see:
diff --git a/arch/blackfin/mach-common/irqpanic.c b/arch/blackfin/mach-common/irqpanic.c
index b22959b197e..606ded9ff4e 100644
--- a/arch/blackfin/mach-common/irqpanic.c
+++ b/arch/blackfin/mach-common/irqpanic.c
@@ -46,9 +46,6 @@ void irq_panic(int reason, struct pt_regs *regs) __attribute__ ((l1_text));
*/
asmlinkage void irq_panic(int reason, struct pt_regs *regs)
{
- int sig = 0;
- siginfo_t info;
-
#ifdef CONFIG_DEBUG_ICACHE_CHECK
unsigned int cmd, tag, ca, cache_hi, cache_lo, *pa;
unsigned short i, j, die;
@@ -136,53 +133,6 @@ asmlinkage void irq_panic(int reason, struct pt_regs *regs)
}
#endif
- printk(KERN_EMERG "\n");
- printk(KERN_EMERG "Exception: IRQ 0x%x entered\n", reason);
- printk(KERN_EMERG " code=[0x%08lx], stack frame=0x%08lx, "
- " bad PC=0x%08lx\n",
- (unsigned long)regs->seqstat,
- (unsigned long)regs,
- (unsigned long)regs->pc);
- if (reason == 0x5) {
- printk(KERN_EMERG "----------- HARDWARE ERROR -----------\n");
-
- /* There is only need to check for Hardware Errors, since other
- * EXCEPTIONS are handled in TRAPS.c (MH)
- */
- switch (regs->seqstat & SEQSTAT_HWERRCAUSE) {
- case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR): /* System MMR Error */
- info.si_code = BUS_ADRALN;
- sig = SIGBUS;
- printk(KERN_EMERG HWC_x2(KERN_EMERG));
- break;
- case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR): /* External Memory Addressing Error */
- info.si_code = BUS_ADRERR;
- sig = SIGBUS;
- printk(KERN_EMERG HWC_x3(KERN_EMERG));
- break;
- case (SEQSTAT_HWERRCAUSE_PERF_FLOW): /* Performance Monitor Overflow */
- printk(KERN_EMERG HWC_x12(KERN_EMERG));
- break;
- case (SEQSTAT_HWERRCAUSE_RAISE_5): /* RAISE 5 instruction */
- printk(KERN_EMERG HWC_x18(KERN_EMERG));
- break;
- default: /* Reserved */
- printk(KERN_EMERG HWC_default(KERN_EMERG));
- break;
- }
- }
-
- regs->ipend = bfin_read_IPEND();
- dump_bfin_process(regs);
- dump_bfin_mem((void *)regs->pc);
- show_regs(regs);
- if (0 == (info.si_signo = sig) || 0 == user_mode(regs)) /* in kernelspace */
- panic("Unhandled IRQ or exceptions!\n");
- else { /* in userspace */
- info.si_errno = 0;
- info.si_addr = (void *)regs->pc;
- force_sig_info(sig, &info, current);
- }
}
#ifdef CONFIG_HARDWARE_PM