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Blackfin: optimize double fault boot checking

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This moves the double fault data used at boot time into a single struct
which can then easily be addressed with indexed loads rather than having
to explicitly load multiple addresses.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2011-05-29 23:12:51 -04:00
parent 072a5cff2f
commit fb1d9be596
6 changed files with 62 additions and 63 deletions
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10
arch/blackfin/include/asm/pda.h
View File

@ -54,6 +54,16 @@ struct blackfin_pda { /* Per-processor Data Area */
#endif
};
struct blackfin_initial_pda {
void *retx;
#ifdef CONFIG_DEBUG_DOUBLEFAULT
void *dcplb_doublefault_addr;
void *icplb_doublefault_addr;
void *retx_doublefault;
unsigned seqstat_doublefault;
#endif
};
extern struct blackfin_pda cpu_pda[];
#endif /* __ASSEMBLY__ */

10
arch/blackfin/kernel/asm-offsets.c
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@ -138,6 +138,16 @@ int main(void)
DEFINE(PDA_DF_SEQSTAT, offsetof(struct blackfin_pda, seqstat_doublefault));
DEFINE(PDA_DF_RETX, offsetof(struct blackfin_pda, retx_doublefault));
#endif
/* PDA initial management */
DEFINE(PDA_INIT_RETX, offsetof(struct blackfin_initial_pda, retx));
#ifdef CONFIG_DEBUG_DOUBLEFAULT
DEFINE(PDA_INIT_DF_DCPLB, offsetof(struct blackfin_initial_pda, dcplb_doublefault_addr));
DEFINE(PDA_INIT_DF_ICPLB, offsetof(struct blackfin_initial_pda, icplb_doublefault_addr));
DEFINE(PDA_INIT_DF_SEQSTAT, offsetof(struct blackfin_initial_pda, seqstat_doublefault));
DEFINE(PDA_INIT_DF_RETX, offsetof(struct blackfin_initial_pda, retx_doublefault));
#endif
#ifdef CONFIG_SMP
/* Inter-core lock (in L2 SRAM) */
DEFINE(SIZEOF_CORELOCK, sizeof(struct corelock_slot));

16
arch/blackfin/kernel/setup.c
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@ -54,8 +54,7 @@ EXPORT_SYMBOL(mtd_size);
#endif
char __initdata command_line[COMMAND_LINE_SIZE];
void __initdata *init_retx, *init_saved_retx, *init_saved_seqstat,
*init_saved_icplb_fault_addr, *init_saved_dcplb_fault_addr;
struct blackfin_initial_pda __initdata initial_pda;
/* boot memmap, for parsing "memmap=" */
#define BFIN_MEMMAP_MAX 128 /* number of entries in bfin_memmap */
@ -957,13 +956,16 @@ void __init setup_arch(char **cmdline_p)
printk(KERN_EMERG "Recovering from DOUBLE FAULT event\n");
#ifdef CONFIG_DEBUG_DOUBLEFAULT
/* We assume the crashing kernel, and the current symbol table match */
printk(KERN_EMERG " While handling exception (EXCAUSE = 0x%x) at %pF\n",
(int)init_saved_seqstat & SEQSTAT_EXCAUSE, init_saved_retx);
printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %pF\n", init_saved_dcplb_fault_addr);
printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %pF\n", init_saved_icplb_fault_addr);
printk(KERN_EMERG " While handling exception (EXCAUSE = %#x) at %pF\n",
initial_pda.seqstat_doublefault & SEQSTAT_EXCAUSE,
initial_pda.retx_doublefault);
printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %pF\n",
initial_pda.dcplb_doublefault_addr);
printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %pF\n",
initial_pda.icplb_doublefault_addr);
#endif
printk(KERN_NOTICE " The instruction at %pF caused a double exception\n",
init_retx);
initial_pda.retx);
} else if (_bfin_swrst & RESET_WDOG)
printk(KERN_INFO "Recovering from Watchdog event\n");
else if (_bfin_swrst & RESET_SOFTWARE)

36
arch/blackfin/mach-bf561/secondary.S
View File

@ -76,37 +76,25 @@ ENTRY(_coreb_trampoline_start)
SSYNC;
/* in case of double faults, save a few things */
p0.l = _init_retx_coreb;
p0.h = _init_retx_coreb;
R0 = RETX;
[P0] = R0;
p1.l = _initial_pda_coreb;
p1.h = _initial_pda_coreb;
r4 = RETX;
#ifdef CONFIG_DEBUG_DOUBLEFAULT
/* Only save these if we are storing them,
* This happens here, since L1 gets clobbered
* below
*/
GET_PDA(p0, r0);
r5 = [p0 + PDA_DF_RETX];
p1.l = _init_saved_retx_coreb;
p1.h = _init_saved_retx_coreb;
[p1] = r5;
r5 = [p0 + PDA_DF_DCPLB];
p1.l = _init_saved_dcplb_fault_addr_coreb;
p1.h = _init_saved_dcplb_fault_addr_coreb;
[p1] = r5;
r5 = [p0 + PDA_DF_ICPLB];
p1.l = _init_saved_icplb_fault_addr_coreb;
p1.h = _init_saved_icplb_fault_addr_coreb;
[p1] = r5;
r5 = [p0 + PDA_DF_SEQSTAT];
p1.l = _init_saved_seqstat_coreb;
p1.h = _init_saved_seqstat_coreb;
[p1] = r5;
r0 = [p0 + PDA_DF_RETX];
r1 = [p0 + PDA_DF_DCPLB];
r2 = [p0 + PDA_DF_ICPLB];
r3 = [p0 + PDA_DF_SEQSTAT];
[p1 + PDA_INIT_DF_RETX] = r0;
[p1 + PDA_INIT_DF_DCPLB] = r1;
[p1 + PDA_INIT_DF_ICPLB] = r2;
[p1 + PDA_INIT_DF_SEQSTAT] = r3;
#endif
[p1 + PDA_INIT_RETX] = r4;
/* Initialize stack pointer */
sp.l = lo(INITIAL_STACK);

36
arch/blackfin/mach-common/head.S
View File

@ -85,37 +85,25 @@ ENTRY(__start)
SSYNC;
/* in case of double faults, save a few things */
p0.l = _init_retx;
p0.h = _init_retx;
R0 = RETX;
[P0] = R0;
p1.l = _initial_pda;
p1.h = _initial_pda;
r4 = RETX;
#ifdef CONFIG_DEBUG_DOUBLEFAULT
/* Only save these if we are storing them,
* This happens here, since L1 gets clobbered
* below
*/
GET_PDA(p0, r0);
r5 = [p0 + PDA_DF_RETX];
p1.l = _init_saved_retx;
p1.h = _init_saved_retx;
[p1] = r5;
r5 = [p0 + PDA_DF_DCPLB];
p1.l = _init_saved_dcplb_fault_addr;
p1.h = _init_saved_dcplb_fault_addr;
[p1] = r5;
r5 = [p0 + PDA_DF_ICPLB];
p1.l = _init_saved_icplb_fault_addr;
p1.h = _init_saved_icplb_fault_addr;
[p1] = r5;
r5 = [p0 + PDA_DF_SEQSTAT];
p1.l = _init_saved_seqstat;
p1.h = _init_saved_seqstat;
[p1] = r5;
r0 = [p0 + PDA_DF_RETX];
r1 = [p0 + PDA_DF_DCPLB];
r2 = [p0 + PDA_DF_ICPLB];
r3 = [p0 + PDA_DF_SEQSTAT];
[p1 + PDA_INIT_DF_RETX] = r0;
[p1 + PDA_INIT_DF_DCPLB] = r1;
[p1 + PDA_INIT_DF_ICPLB] = r2;
[p1 + PDA_INIT_DF_SEQSTAT] = r3;
#endif
[p1 + PDA_INIT_RETX] = r4;
/* Initialize stack pointer */
sp.l = _init_thread_union + THREAD_SIZE;

17
arch/blackfin/mach-common/smp.c
View File

@ -45,9 +45,7 @@ struct corelock_slot corelock __attribute__ ((__section__(".l2.bss")));
unsigned long blackfin_iflush_l1_entry[NR_CPUS];
#endif
void __cpuinitdata *init_retx_coreb, *init_saved_retx_coreb,
*init_saved_seqstat_coreb, *init_saved_icplb_fault_addr_coreb,
*init_saved_dcplb_fault_addr_coreb;
struct blackfin_initial_pda __cpuinitdata initial_pda_coreb;
#define BFIN_IPI_RESCHEDULE 0
#define BFIN_IPI_CALL_FUNC 1
@ -369,13 +367,16 @@ void __cpuinit secondary_start_kernel(void)
if (_bfin_swrst & SWRST_DBL_FAULT_B) {
printk(KERN_EMERG "CoreB Recovering from DOUBLE FAULT event\n");
#ifdef CONFIG_DEBUG_DOUBLEFAULT
printk(KERN_EMERG " While handling exception (EXCAUSE = 0x%x) at %pF\n",
(int)init_saved_seqstat_coreb & SEQSTAT_EXCAUSE, init_saved_retx_coreb);
printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %pF\n", init_saved_dcplb_fault_addr_coreb);
printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %pF\n", init_saved_icplb_fault_addr_coreb);
printk(KERN_EMERG " While handling exception (EXCAUSE = %#x) at %pF\n",
initial_pda_coreb.seqstat_doublefault & SEQSTAT_EXCAUSE,
initial_pda_coreb.retx_doublefault);
printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %pF\n",
initial_pda_coreb.dcplb_doublefault_addr);
printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %pF\n",
initial_pda_coreb.icplb_doublefault_addr);
#endif
printk(KERN_NOTICE " The instruction at %pF caused a double exception\n",
init_retx_coreb);
initial_pda_coreb.retx);
}
/*