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powerpc/pmap: Add pmap_sync_icache() for radix pmap

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DTrace pid provider writes to user space to set breakpoints.  Failing to
sync the icache can lead to SIGTRAP.  Radix pmap is the only one missing
a pmap_sync_icache() method, so the pid provider would only potentially
crash a process on a POWER9 or later system.
This commit is contained in:
Justin Hibbits 2023-03-12 11:46:57 -04:00
parent 63715498ac
commit 6f0b2a235a
1 changed files with 21 additions and 0 deletions
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21
sys/powerpc/aim/mmu_radix.c
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@ -464,6 +464,7 @@ void mmu_radix_remove(pmap_t, vm_offset_t, vm_offset_t);
void mmu_radix_remove_all(vm_page_t);
void mmu_radix_remove_pages(pmap_t);
void mmu_radix_remove_write(vm_page_t);
void mmu_radix_sync_icache(pmap_t pm, vm_offset_t va, vm_size_t sz);
void mmu_radix_unwire(pmap_t, vm_offset_t, vm_offset_t);
void mmu_radix_zero_page(vm_page_t);
void mmu_radix_zero_page_area(vm_page_t, int, int);
@ -542,6 +543,7 @@ static struct pmap_funcs mmu_radix_methods = {
.remove = mmu_radix_remove,
.remove_all = mmu_radix_remove_all,
.remove_write = mmu_radix_remove_write,
.sync_icache = mmu_radix_sync_icache,
.unwire = mmu_radix_unwire,
.zero_page = mmu_radix_zero_page,
.zero_page_area = mmu_radix_zero_page_area,
@ -5921,6 +5923,25 @@ mmu_radix_unmapdev(void *p, vm_size_t size)
}
}
void
mmu_radix_sync_icache(pmap_t pm, vm_offset_t va, vm_size_t sz)
{
vm_paddr_t pa = 0;
int sync_sz;
while (sz > 0) {
pa = pmap_extract(pm, va);
sync_sz = PAGE_SIZE - (va & PAGE_MASK);
sync_sz = min(sync_sz, sz);
if (pa != 0) {
pa += (va & PAGE_MASK);
__syncicache((void *)PHYS_TO_DMAP(pa), sync_sz);
}
va += sync_sz;
sz -= sync_sz;
}
}
static __inline void
pmap_pte_attr(pt_entry_t *pte, uint64_t cache_bits, uint64_t mask)
{