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Diffstat (limited to 'arch/nios2/mm/tlb.c')
-rw-r--r--arch/nios2/mm/tlb.c191
1 files changed, 108 insertions, 83 deletions
diff --git a/arch/nios2/mm/tlb.c b/arch/nios2/mm/tlb.c
index cf10326aab1c..af8711885569 100644
--- a/arch/nios2/mm/tlb.c
+++ b/arch/nios2/mm/tlb.c
@@ -23,10 +23,6 @@
((((1UL << (cpuinfo.tlb_ptr_sz - cpuinfo.tlb_num_ways_log2))) - 1) \
<< PAGE_SHIFT)
-/* Used as illegal PHYS_ADDR for TLB mappings
- */
-#define MAX_PHYS_ADDR 0
-
static void get_misc_and_pid(unsigned long *misc, unsigned long *pid)
{
*misc = RDCTL(CTL_TLBMISC);
@@ -35,28 +31,23 @@ static void get_misc_and_pid(unsigned long *misc, unsigned long *pid)
}
/*
- * All entries common to a mm share an asid. To effectively flush these
- * entries, we just bump the asid.
+ * This provides a PTEADDR value for addr that will cause a TLB miss
+ * (fast TLB miss). TLB invalidation replaces entries with this value.
*/
-void flush_tlb_mm(struct mm_struct *mm)
+static unsigned long pteaddr_invalid(unsigned long addr)
{
- if (current->mm == mm)
- flush_tlb_all();
- else
- memset(&mm->context, 0, sizeof(mm_context_t));
+ return ((addr | 0xC0000000UL) >> PAGE_SHIFT) << 2;
}
/*
* This one is only used for pages with the global bit set so we don't care
* much about the ASID.
*/
-void flush_tlb_one_pid(unsigned long addr, unsigned long mmu_pid)
+static void replace_tlb_one_pid(unsigned long addr, unsigned long mmu_pid, unsigned long tlbacc)
{
unsigned int way;
unsigned long org_misc, pid_misc;
- pr_debug("Flush tlb-entry for vaddr=%#lx\n", addr);
-
/* remember pid/way until we return. */
get_misc_and_pid(&org_misc, &pid_misc);
@@ -67,30 +58,47 @@ void flush_tlb_one_pid(unsigned long addr, unsigned long mmu_pid)
unsigned long tlbmisc;
unsigned long pid;
- tlbmisc = pid_misc | TLBMISC_RD | (way << TLBMISC_WAY_SHIFT);
+ tlbmisc = TLBMISC_RD | (way << TLBMISC_WAY_SHIFT);
WRCTL(CTL_TLBMISC, tlbmisc);
+
pteaddr = RDCTL(CTL_PTEADDR);
+ if (((pteaddr >> 2) & 0xfffff) != (addr >> PAGE_SHIFT))
+ continue;
+
tlbmisc = RDCTL(CTL_TLBMISC);
pid = (tlbmisc >> TLBMISC_PID_SHIFT) & TLBMISC_PID_MASK;
- if (((((pteaddr >> 2) & 0xfffff)) == (addr >> PAGE_SHIFT)) &&
- pid == mmu_pid) {
- unsigned long vaddr = CONFIG_NIOS2_IO_REGION_BASE +
- ((PAGE_SIZE * cpuinfo.tlb_num_lines) * way) +
- (addr & TLB_INDEX_MASK);
- pr_debug("Flush entry by writing %#lx way=%dl pid=%ld\n",
- vaddr, way, (pid_misc >> TLBMISC_PID_SHIFT));
-
- WRCTL(CTL_PTEADDR, (vaddr >> 12) << 2);
- tlbmisc = pid_misc | TLBMISC_WE |
- (way << TLBMISC_WAY_SHIFT);
- WRCTL(CTL_TLBMISC, tlbmisc);
- WRCTL(CTL_TLBACC, (MAX_PHYS_ADDR >> PAGE_SHIFT));
- }
+ if (pid != mmu_pid)
+ continue;
+
+ tlbmisc = mmu_pid | TLBMISC_WE | (way << TLBMISC_WAY_SHIFT);
+ WRCTL(CTL_TLBMISC, tlbmisc);
+ if (tlbacc == 0)
+ WRCTL(CTL_PTEADDR, pteaddr_invalid(addr));
+ WRCTL(CTL_TLBACC, tlbacc);
+ /*
+ * There should be only a single entry that maps a
+ * particular {address,pid} so break after a match.
+ */
+ break;
}
WRCTL(CTL_TLBMISC, org_misc);
}
+static void flush_tlb_one_pid(unsigned long addr, unsigned long mmu_pid)
+{
+ pr_debug("Flush tlb-entry for vaddr=%#lx\n", addr);
+
+ replace_tlb_one_pid(addr, mmu_pid, 0);
+}
+
+static void reload_tlb_one_pid(unsigned long addr, unsigned long mmu_pid, pte_t pte)
+{
+ pr_debug("Reload tlb-entry for vaddr=%#lx\n", addr);
+
+ replace_tlb_one_pid(addr, mmu_pid, pte_val(pte));
+}
+
void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end)
{
@@ -102,19 +110,18 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
}
}
-void flush_tlb_kernel_range(unsigned long start, unsigned long end)
+void reload_tlb_page(struct vm_area_struct *vma, unsigned long addr, pte_t pte)
{
- while (start < end) {
- flush_tlb_one(start);
- start += PAGE_SIZE;
- }
+ unsigned long mmu_pid = get_pid_from_context(&vma->vm_mm->context);
+
+ reload_tlb_one_pid(addr, mmu_pid, pte);
}
/*
* This one is only used for pages with the global bit set so we don't care
* much about the ASID.
*/
-void flush_tlb_one(unsigned long addr)
+static void flush_tlb_one(unsigned long addr)
{
unsigned int way;
unsigned long org_misc, pid_misc;
@@ -130,30 +137,33 @@ void flush_tlb_one(unsigned long addr)
unsigned long pteaddr;
unsigned long tlbmisc;
- tlbmisc = pid_misc | TLBMISC_RD | (way << TLBMISC_WAY_SHIFT);
+ tlbmisc = TLBMISC_RD | (way << TLBMISC_WAY_SHIFT);
WRCTL(CTL_TLBMISC, tlbmisc);
- pteaddr = RDCTL(CTL_PTEADDR);
- tlbmisc = RDCTL(CTL_TLBMISC);
- if ((((pteaddr >> 2) & 0xfffff)) == (addr >> PAGE_SHIFT)) {
- unsigned long vaddr = CONFIG_NIOS2_IO_REGION_BASE +
- ((PAGE_SIZE * cpuinfo.tlb_num_lines) * way) +
- (addr & TLB_INDEX_MASK);
+ pteaddr = RDCTL(CTL_PTEADDR);
+ if (((pteaddr >> 2) & 0xfffff) != (addr >> PAGE_SHIFT))
+ continue;
- pr_debug("Flush entry by writing %#lx way=%dl pid=%ld\n",
- vaddr, way, (pid_misc >> TLBMISC_PID_SHIFT));
+ pr_debug("Flush entry by writing way=%dl pid=%ld\n",
+ way, (pid_misc >> TLBMISC_PID_SHIFT));
- tlbmisc = pid_misc | TLBMISC_WE |
- (way << TLBMISC_WAY_SHIFT);
- WRCTL(CTL_PTEADDR, (vaddr >> 12) << 2);
- WRCTL(CTL_TLBMISC, tlbmisc);
- WRCTL(CTL_TLBACC, (MAX_PHYS_ADDR >> PAGE_SHIFT));
- }
+ tlbmisc = TLBMISC_WE | (way << TLBMISC_WAY_SHIFT);
+ WRCTL(CTL_TLBMISC, tlbmisc);
+ WRCTL(CTL_PTEADDR, pteaddr_invalid(addr));
+ WRCTL(CTL_TLBACC, 0);
}
WRCTL(CTL_TLBMISC, org_misc);
}
+void flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+ while (start < end) {
+ flush_tlb_one(start);
+ start += PAGE_SIZE;
+ }
+}
+
void dump_tlb_line(unsigned long line)
{
unsigned int way;
@@ -177,7 +187,7 @@ void dump_tlb_line(unsigned long line)
tlbmisc = RDCTL(CTL_TLBMISC);
tlbacc = RDCTL(CTL_TLBACC);
- if ((tlbacc << PAGE_SHIFT) != (MAX_PHYS_ADDR & PAGE_MASK)) {
+ if ((tlbacc << PAGE_SHIFT) != 0) {
pr_debug("-- way:%02x vpn:0x%08lx phys:0x%08lx pid:0x%02lx flags:%c%c%c%c%c\n",
way,
(pteaddr << (PAGE_SHIFT-2)),
@@ -203,8 +213,9 @@ void dump_tlb(void)
dump_tlb_line(i);
}
-void flush_tlb_pid(unsigned long pid)
+void flush_tlb_pid(unsigned long mmu_pid)
{
+ unsigned long addr = 0;
unsigned int line;
unsigned int way;
unsigned long org_misc, pid_misc;
@@ -213,55 +224,65 @@ void flush_tlb_pid(unsigned long pid)
get_misc_and_pid(&org_misc, &pid_misc);
for (line = 0; line < cpuinfo.tlb_num_lines; line++) {
- WRCTL(CTL_PTEADDR, line << 2);
+ WRCTL(CTL_PTEADDR, pteaddr_invalid(addr));
for (way = 0; way < cpuinfo.tlb_num_ways; way++) {
- unsigned long pteaddr;
unsigned long tlbmisc;
- unsigned long tlbacc;
+ unsigned long pid;
- tlbmisc = pid_misc | TLBMISC_RD |
- (way << TLBMISC_WAY_SHIFT);
+ tlbmisc = TLBMISC_RD | (way << TLBMISC_WAY_SHIFT);
WRCTL(CTL_TLBMISC, tlbmisc);
- pteaddr = RDCTL(CTL_PTEADDR);
tlbmisc = RDCTL(CTL_TLBMISC);
- tlbacc = RDCTL(CTL_TLBACC);
-
- if (((tlbmisc>>TLBMISC_PID_SHIFT) & TLBMISC_PID_MASK)
- == pid) {
- tlbmisc = pid_misc | TLBMISC_WE |
- (way << TLBMISC_WAY_SHIFT);
- WRCTL(CTL_TLBMISC, tlbmisc);
- WRCTL(CTL_TLBACC,
- (MAX_PHYS_ADDR >> PAGE_SHIFT));
- }
+ pid = (tlbmisc >> TLBMISC_PID_SHIFT) & TLBMISC_PID_MASK;
+ if (pid != mmu_pid)
+ continue;
+
+ tlbmisc = TLBMISC_WE | (way << TLBMISC_WAY_SHIFT);
+ WRCTL(CTL_TLBMISC, tlbmisc);
+ WRCTL(CTL_TLBACC, 0);
}
- WRCTL(CTL_TLBMISC, org_misc);
+ addr += PAGE_SIZE;
+ }
+
+ WRCTL(CTL_TLBMISC, org_misc);
+}
+
+/*
+ * All entries common to a mm share an asid. To effectively flush these
+ * entries, we just bump the asid.
+ */
+void flush_tlb_mm(struct mm_struct *mm)
+{
+ if (current->mm == mm) {
+ unsigned long mmu_pid = get_pid_from_context(&mm->context);
+ flush_tlb_pid(mmu_pid);
+ } else {
+ memset(&mm->context, 0, sizeof(mm_context_t));
}
}
void flush_tlb_all(void)
{
- int i;
- unsigned long vaddr = CONFIG_NIOS2_IO_REGION_BASE;
+ unsigned long addr = 0;
+ unsigned int line;
unsigned int way;
- unsigned long org_misc, pid_misc, tlbmisc;
+ unsigned long org_misc, pid_misc;
/* remember pid/way until we return */
get_misc_and_pid(&org_misc, &pid_misc);
- pid_misc |= TLBMISC_WE;
+
+ /* Start at way 0, way is auto-incremented after each TLBACC write */
+ WRCTL(CTL_TLBMISC, TLBMISC_WE);
/* Map each TLB entry to physcal address 0 with no-access and a
bad ptbase */
- for (way = 0; way < cpuinfo.tlb_num_ways; way++) {
- tlbmisc = pid_misc | (way << TLBMISC_WAY_SHIFT);
- for (i = 0; i < cpuinfo.tlb_num_lines; i++) {
- WRCTL(CTL_PTEADDR, ((vaddr) >> PAGE_SHIFT) << 2);
- WRCTL(CTL_TLBMISC, tlbmisc);
- WRCTL(CTL_TLBACC, (MAX_PHYS_ADDR >> PAGE_SHIFT));
- vaddr += 1UL << 12;
- }
+ for (line = 0; line < cpuinfo.tlb_num_lines; line++) {
+ WRCTL(CTL_PTEADDR, pteaddr_invalid(addr));
+ for (way = 0; way < cpuinfo.tlb_num_ways; way++)
+ WRCTL(CTL_TLBACC, 0);
+
+ addr += PAGE_SIZE;
}
/* restore pid/way */
@@ -270,6 +291,10 @@ void flush_tlb_all(void)
void set_mmu_pid(unsigned long pid)
{
- WRCTL(CTL_TLBMISC, (RDCTL(CTL_TLBMISC) & TLBMISC_WAY) |
- ((pid & TLBMISC_PID_MASK) << TLBMISC_PID_SHIFT));
+ unsigned long tlbmisc;
+
+ tlbmisc = RDCTL(CTL_TLBMISC);
+ tlbmisc = (tlbmisc & TLBMISC_WAY);
+ tlbmisc |= (pid & TLBMISC_PID_MASK) << TLBMISC_PID_SHIFT;
+ WRCTL(CTL_TLBMISC, tlbmisc);
}