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um: Optimize TLB operations v2 

Make the code to merge mmap/munmap/mprotect operations in tlb.c
common for userspace and kernel. Kernel tlb operations can now
be merged as well.

Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Anton Ivanov 2018-12-05 12:37:39 +00:00 committed by Richard Weinberger
parent 747b254ca2
commit a9c52c2a28
1 changed files with 57 additions and 28 deletions
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85
arch/um/kernel/tlb.c
View File

@ -37,17 +37,19 @@ struct host_vm_change {
} mprotect;
} u;
} ops[1];
int userspace;
int index;
struct mm_id *id;
struct mm_struct *mm;
void *data;
int force;
};
#define INIT_HVC(mm, force) \
#define INIT_HVC(mm, force, userspace) \
((struct host_vm_change) \
{ .ops = { { .type = NONE } }, \
.id = &mm->context.id, \
.mm = mm, \
.data = NULL, \
.userspace = userspace, \
.index = 0, \
.force = force })
@ -68,18 +70,40 @@ static int do_ops(struct host_vm_change *hvc, int end,
op = &hvc->ops[i];
switch (op->type) {
case MMAP:
ret = map(hvc->id, op->u.mmap.addr, op->u.mmap.len,
op->u.mmap.prot, op->u.mmap.fd,
op->u.mmap.offset, finished, &hvc->data);
if (hvc->userspace)
ret = map(&hvc->mm->context.id, op->u.mmap.addr,
op->u.mmap.len, op->u.mmap.prot,
op->u.mmap.fd,
op->u.mmap.offset, finished,
&hvc->data);
else
map_memory(op->u.mmap.addr, op->u.mmap.offset,
op->u.mmap.len, 1, 1, 1);
break;
case MUNMAP:
ret = unmap(hvc->id, op->u.munmap.addr,
op->u.munmap.len, finished, &hvc->data);
if (hvc->userspace)
ret = unmap(&hvc->mm->context.id,
op->u.munmap.addr,
op->u.munmap.len, finished,
&hvc->data);
else
ret = os_unmap_memory(
(void *) op->u.munmap.addr,
op->u.munmap.len);
break;
case MPROTECT:
ret = protect(hvc->id, op->u.mprotect.addr,
op->u.mprotect.len, op->u.mprotect.prot,
finished, &hvc->data);
if (hvc->userspace)
ret = protect(&hvc->mm->context.id,
op->u.mprotect.addr,
op->u.mprotect.len,
op->u.mprotect.prot,
finished, &hvc->data);
else
ret = os_protect_memory(
(void *) op->u.mprotect.addr,
op->u.mprotect.len,
1, 1, 1);
break;
default:
printk(KERN_ERR "Unknown op type %d in do_ops\n",
@ -100,9 +124,12 @@ static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
{
__u64 offset;
struct host_vm_op *last;
int fd, ret = 0;
int fd = -1, ret = 0;
fd = phys_mapping(phys, &offset);
if (hvc->userspace)
fd = phys_mapping(phys, &offset);
else
offset = phys;
if (hvc->index != 0) {
last = &hvc->ops[hvc->index - 1];
if ((last->type == MMAP) &&
@ -277,9 +304,9 @@ void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
pgd_t *pgd;
struct host_vm_change hvc;
unsigned long addr = start_addr, next;
int ret = 0;
int ret = 0, userspace = 1;
hvc = INIT_HVC(mm, force);
hvc = INIT_HVC(mm, force, userspace);
pgd = pgd_offset(mm, addr);
do {
next = pgd_addr_end(addr, end_addr);
@ -314,9 +341,11 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
pmd_t *pmd;
pte_t *pte;
unsigned long addr, last;
int updated = 0, err;
int updated = 0, err = 0, force = 0, userspace = 0;
struct host_vm_change hvc;
mm = &init_mm;
hvc = INIT_HVC(mm, force, userspace);
for (addr = start; addr < end;) {
pgd = pgd_offset(mm, addr);
if (!pgd_present(*pgd)) {
@ -325,8 +354,7 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
last = end;
if (pgd_newpage(*pgd)) {
updated = 1;
err = os_unmap_memory((void *) addr,
last - addr);
err = add_munmap(addr, last - addr, &hvc);
if (err < 0)
panic("munmap failed, errno = %d\n",
-err);
@ -342,8 +370,7 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
last = end;
if (pud_newpage(*pud)) {
updated = 1;
err = os_unmap_memory((void *) addr,
last - addr);
err = add_munmap(addr, last - addr, &hvc);
if (err < 0)
panic("munmap failed, errno = %d\n",
-err);
@ -359,8 +386,7 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
last = end;
if (pmd_newpage(*pmd)) {
updated = 1;
err = os_unmap_memory((void *) addr,
last - addr);
err = add_munmap(addr, last - addr, &hvc);
if (err < 0)
panic("munmap failed, errno = %d\n",
-err);
@ -372,22 +398,25 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
pte = pte_offset_kernel(pmd, addr);
if (!pte_present(*pte) || pte_newpage(*pte)) {
updated = 1;
err = os_unmap_memory((void *) addr,
PAGE_SIZE);
err = add_munmap(addr, PAGE_SIZE, &hvc);
if (err < 0)
panic("munmap failed, errno = %d\n",
-err);
if (pte_present(*pte))
map_memory(addr,
pte_val(*pte) & PAGE_MASK,
PAGE_SIZE, 1, 1, 1);
err = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
PAGE_SIZE, 0, &hvc);
}
else if (pte_newprot(*pte)) {
updated = 1;
os_protect_memory((void *) addr, PAGE_SIZE, 1, 1, 1);
err = add_mprotect(addr, PAGE_SIZE, 0, &hvc);
}
addr += PAGE_SIZE;
}
if (!err)
err = do_ops(&hvc, hvc.index, 1);
if (err < 0)
panic("flush_tlb_kernel failed, errno = %d\n", err);
return updated;
}