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authorVineet Gupta <vgupta@synopsys.com>2013-08-23 17:37:18 +0530
committerVineet Gupta <vgupta@synopsys.com>2013-08-30 21:42:18 +0530
commit5bd87adf9b2ae5fa1bb469c68029b4eec06d6e03 (patch)
tree25b80c5717ae313fa52d4153caa6fef3100055bb /arch/arc/mm
parentade922f8e269115252d199bf6c524a10379cf716 (diff)
downloadlinux-5bd87adf9b2ae5fa1bb469c68029b4eec06d6e03.tar.bz2
ARC: [ASID] Refactor the TLB paranoid debug code
-Asm code already has values of SW and HW ASID values, so they can be passed to the printing routine. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/mm')
-rw-r--r--arch/arc/mm/tlb.c24
-rw-r--r--arch/arc/mm/tlbex.S16
2 files changed, 20 insertions, 20 deletions
diff --git a/arch/arc/mm/tlb.c b/arch/arc/mm/tlb.c
index 7646a96f3155..a4ad68c4b50d 100644
--- a/arch/arc/mm/tlb.c
+++ b/arch/arc/mm/tlb.c
@@ -688,25 +688,27 @@ void do_tlb_overlap_fault(unsigned long cause, unsigned long address,
* Low Level ASM TLB handler calls this if it finds that HW and SW ASIDS
* don't match
*/
-void print_asid_mismatch(int is_fast_path)
+void print_asid_mismatch(int mm_asid, int mmu_asid, int is_fast_path)
{
- int pid_sw, pid_hw;
- pid_sw = current->active_mm->context.asid;
- pid_hw = read_aux_reg(ARC_REG_PID) & 0xff;
-
pr_emerg("ASID Mismatch in %s Path Handler: sw-pid=0x%x hw-pid=0x%x\n",
- is_fast_path ? "Fast" : "Slow", pid_sw, pid_hw);
+ is_fast_path ? "Fast" : "Slow", mm_asid, mmu_asid);
__asm__ __volatile__("flag 1");
}
-void tlb_paranoid_check(unsigned int pid_sw, unsigned long addr)
+void tlb_paranoid_check(unsigned int mm_asid, unsigned long addr)
{
- unsigned int pid_hw;
+ unsigned int mmu_asid;
- pid_hw = read_aux_reg(ARC_REG_PID) & 0xff;
+ mmu_asid = read_aux_reg(ARC_REG_PID) & 0xff;
- if (addr < 0x70000000 && ((pid_hw != pid_sw) || (pid_sw == NO_ASID)))
- print_asid_mismatch(0);
+ /*
+ * At the time of a TLB miss/installation
+ * - HW version needs to match SW version
+ * - SW needs to have a valid ASID
+ */
+ if (addr < 0x70000000 &&
+ ((mmu_asid != mm_asid) || (mm_asid == NO_ASID)))
+ print_asid_mismatch(mm_asid, mmu_asid, 0);
}
#endif
diff --git a/arch/arc/mm/tlbex.S b/arch/arc/mm/tlbex.S
index 50e83ca96b96..88897a112d55 100644
--- a/arch/arc/mm/tlbex.S
+++ b/arch/arc/mm/tlbex.S
@@ -102,7 +102,7 @@ ex_saved_reg1:
; VERIFY if the ASID in MMU-PID Reg is same as
; one in Linux data structures
- DBG_ASID_MISMATCH
+ tlb_paranoid_check_asm
.endm
.macro TLBMISS_RESTORE_REGS
@@ -133,34 +133,32 @@ ex_saved_reg1:
; In bizzare scenrios SW and HW ASID can get out-of-sync which is trouble.
; So we try to detect this in TLB Mis shandler
-
-.macro DBG_ASID_MISMATCH
+.macro tlb_paranoid_check_asm
#ifdef CONFIG_ARC_DBG_TLB_PARANOIA
- ; make sure h/w ASID is same as s/w ASID
-
GET_CURR_TASK_ON_CPU r3
ld r0, [r3, TASK_ACT_MM]
ld r0, [r0, MM_CTXT+MM_CTXT_ASID]
lr r1, [ARC_REG_PID]
and r1, r1, 0xFF
+
breq r1, r0, 5f
; Error if H/w and S/w ASID don't match, but NOT if in kernel mode
- lr r0, [erstatus]
- bbit0 r0, STATUS_U_BIT, 5f
+ lr r2, [erstatus]
+ bbit0 r2, STATUS_U_BIT, 5f
; We sure are in troubled waters, Flag the error, but to do so
; need to switch to kernel mode stack to call error routine
GET_TSK_STACK_BASE r3, sp
; Call printk to shoutout aloud
- mov r0, 1
+ mov r2, 1
j print_asid_mismatch
-5: ; ASIDs match so proceed normally
+5: ; ASIDs match so proceed normally
nop
#endif