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ARC: mm: Improve Duplicate PD Fault handler 

- Move the verbosity knob from .data to .bss by using inverted logic
 - No need to readout PD1 descriptor
 - clip the non pfn bits of PD0 to avoid clipping inside the loop

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2015-10-13 12:11:38 +05:30
parent 9acdc911b5
commit 8840e14cd8
1 changed files with 22 additions and 22 deletions
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44
arch/arc/mm/tlb.c
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@ -856,15 +856,15 @@ void arc_mmu_init(void)
* the duplicate one.
* -Knob to be verbose abt it.(TODO: hook them up to debugfs)
*/
volatile int dup_pd_verbose = 1;/* Be slient abt it or complain (default) */
volatile int dup_pd_silent; /* Be slient abt it or complain (default) */
void do_tlb_overlap_fault(unsigned long cause, unsigned long address,
struct pt_regs *regs)
{
int set, way, n;
unsigned long flags, is_valid;
struct cpuinfo_arc_mmu *mmu = &cpuinfo_arc700[smp_processor_id()].mmu;
unsigned int pd0[mmu->ways], pd1[mmu->ways];
unsigned int pd0[mmu->ways];
unsigned long flags;
int set;
local_irq_save(flags);
@ -874,14 +874,16 @@ void do_tlb_overlap_fault(unsigned long cause, unsigned long address,
/* loop thru all sets of TLB */
for (set = 0; set < mmu->sets; set++) {
int is_valid, way;
/* read out all the ways of current set */
for (way = 0, is_valid = 0; way < mmu->ways; way++) {
write_aux_reg(ARC_REG_TLBINDEX,
SET_WAY_TO_IDX(mmu, set, way));
write_aux_reg(ARC_REG_TLBCOMMAND, TLBRead);
pd0[way] = read_aux_reg(ARC_REG_TLBPD0);
pd1[way] = read_aux_reg(ARC_REG_TLBPD1);
is_valid |= pd0[way] & _PAGE_PRESENT;
pd0[way] &= PAGE_MASK;
}
/* If all the WAYS in SET are empty, skip to next SET */
@ -890,30 +892,28 @@ void do_tlb_overlap_fault(unsigned long cause, unsigned long address,
/* Scan the set for duplicate ways: needs a nested loop */
for (way = 0; way < mmu->ways - 1; way++) {
int n;
if (!pd0[way])
continue;
for (n = way + 1; n < mmu->ways; n++) {
if ((pd0[way] & PAGE_MASK) ==
(pd0[n] & PAGE_MASK)) {
if (pd0[way] != pd0[n])
continue;
if (dup_pd_verbose) {
pr_info("Duplicate PD's @"
"[%d:%d]/[%d:%d]\n",
set, way, set, n);
pr_info("TLBPD0[%u]: %08x\n",
way, pd0[way]);
}
if (!dup_pd_silent)
pr_info("Dup TLB PD0 %08x @ set %d ways %d,%d\n",
pd0[way], set, way, n);
/*
* clear entry @way and not @n. This is
* critical to our optimised loop
*/
pd0[way] = pd1[way] = 0;
write_aux_reg(ARC_REG_TLBINDEX,
/*
* clear entry @way and not @n.
* This is critical to our optimised loop
*/
pd0[way] = 0;
write_aux_reg(ARC_REG_TLBINDEX,
SET_WAY_TO_IDX(mmu, set, way));
__tlb_entry_erase();
}
__tlb_entry_erase();
}
}
}