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sgi-gru: restructure the GRU vtop functions 

Restructure the GRU vtop functions in preparation for future changes.
This patch simply moves code around & does not change the algorithm.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jack Steiner 2009-04-02 16:59:09 -07:00 committed by Linus Torvalds
parent 8741941237
commit ecdaf2b552
1 changed files with 44 additions and 24 deletions
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68
drivers/misc/sgi-gru/grufault.c
View File

@ -267,6 +267,44 @@ err:
return 1;
}
static int gru_vtop(struct gru_thread_state *gts, unsigned long vaddr,
int write, int atomic, unsigned long *gpa, int *pageshift)
{
struct mm_struct *mm = gts->ts_mm;
struct vm_area_struct *vma;
unsigned long paddr;
int ret, ps;
vma = find_vma(mm, vaddr);
if (!vma)
goto inval;
/*
* Atomic lookup is faster & usually works even if called in non-atomic
* context.
*/
rmb(); /* Must/check ms_range_active before loading PTEs */
ret = atomic_pte_lookup(vma, vaddr, write, &paddr, &ps);
if (ret) {
if (atomic)
goto upm;
if (non_atomic_pte_lookup(vma, vaddr, write, &paddr, &ps))
goto inval;
}
if (is_gru_paddr(paddr))
goto inval;
paddr = paddr & ~((1UL << ps) - 1);
*gpa = uv_soc_phys_ram_to_gpa(paddr);
*pageshift = ps;
return 0;
inval:
return -1;
upm:
return -2;
}
/*
* Drop a TLB entry into the GRU. The fault is described by info in an TFH.
* Input:
@ -281,10 +319,8 @@ static int gru_try_dropin(struct gru_thread_state *gts,
struct gru_tlb_fault_handle *tfh,
unsigned long __user *cb)
{
struct mm_struct *mm = gts->ts_mm;
struct vm_area_struct *vma;
int pageshift, asid, write, ret;
unsigned long paddr, gpa, vaddr;
int pageshift = 0, asid, write, ret, atomic = !cb;
unsigned long gpa = 0, vaddr = 0;
/*
* NOTE: The GRU contains magic hardware that eliminates races between
@ -318,28 +354,12 @@ static int gru_try_dropin(struct gru_thread_state *gts,
if (atomic_read(&gts->ts_gms->ms_range_active))
goto failactive;
vma = find_vma(mm, vaddr);
if (!vma)
ret = gru_vtop(gts, vaddr, write, atomic, &gpa, &pageshift);
if (ret == -1)
goto failinval;
if (ret == -2)
goto failupm;
/*
* Atomic lookup is faster & usually works even if called in non-atomic
* context.
*/
rmb(); /* Must/check ms_range_active before loading PTEs */
ret = atomic_pte_lookup(vma, vaddr, write, &paddr, &pageshift);
if (ret) {
if (!cb)
goto failupm;
if (non_atomic_pte_lookup(vma, vaddr, write, &paddr,
&pageshift))
goto failinval;
}
if (is_gru_paddr(paddr))
goto failinval;
paddr = paddr & ~((1UL << pageshift) - 1);
gpa = uv_soc_phys_ram_to_gpa(paddr);
gru_cb_set_istatus_active(cb);
tfh_write_restart(tfh, gpa, GAA_RAM, vaddr, asid, write,
GRU_PAGESIZE(pageshift));