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parisc: Fix invalidate/flush vmap routines

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Cache move-in for virtual accesses is controlled by the TLB.  Thus,
we must generally purge TLB entries before flushing.  The flush routines
must use TLB entries that inhibit cache move-in.

V2: Load physical address prior to flushing TLB.  In flush_cache_page,
flush TLB when flushing and purging.

V3: Don't flush when start equals end.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
John David Anglin 2022-03-19 19:04:15 +00:00 committed by Helge Deller
parent 411fadd62c
commit 53d862fac4
1 changed files with 19 additions and 5 deletions
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24
arch/parisc/kernel/cache.c
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@ -611,8 +611,8 @@ void
flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long pfn)
{
if (pfn_valid(pfn)) {
flush_tlb_page(vma, vmaddr);
if (likely(vma->vm_mm->context.space_id)) {
flush_tlb_page(vma, vmaddr);
__flush_cache_page(vma, vmaddr, PFN_PHYS(pfn));
} else {
__purge_cache_page(vma, vmaddr, PFN_PHYS(pfn));
@ -624,6 +624,7 @@ void flush_kernel_vmap_range(void *vaddr, int size)
{
unsigned long start = (unsigned long)vaddr;
unsigned long end = start + size;
unsigned long flags, physaddr;
if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) &&
(unsigned long)size >= parisc_cache_flush_threshold) {
@ -632,8 +633,14 @@ void flush_kernel_vmap_range(void *vaddr, int size)
return;
}
flush_kernel_dcache_range_asm(start, end);
flush_tlb_kernel_range(start, end);
while (start < end) {
physaddr = lpa(start);
purge_tlb_start(flags);
pdtlb(SR_KERNEL, start);
purge_tlb_end(flags);
flush_dcache_page_asm(physaddr, start);
start += PAGE_SIZE;
}
}
EXPORT_SYMBOL(flush_kernel_vmap_range);
@ -641,6 +648,7 @@ void invalidate_kernel_vmap_range(void *vaddr, int size)
{
unsigned long start = (unsigned long)vaddr;
unsigned long end = start + size;
unsigned long flags, physaddr;
if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) &&
(unsigned long)size >= parisc_cache_flush_threshold) {
@ -649,7 +657,13 @@ void invalidate_kernel_vmap_range(void *vaddr, int size)
return;
}
purge_kernel_dcache_range_asm(start, end);
flush_tlb_kernel_range(start, end);
while (start < end) {
physaddr = lpa(start);
purge_tlb_start(flags);
pdtlb(SR_KERNEL, start);
purge_tlb_end(flags);
purge_dcache_page_asm(physaddr, start);
start += PAGE_SIZE;
}
}
EXPORT_SYMBOL(invalidate_kernel_vmap_range);