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authorJack Steiner <steiner@sgi.com>2009-04-02 16:59:09 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-02 19:05:06 -0700
commitecdaf2b55251f718a1fbaf4a3f72bfd6e25c582c (patch)
tree2c85778f12e1423d8cc05ce6be6da6e8d2c9a475 /drivers/misc
parent874194123718e625aa96632bac457d686ba1378e (diff)
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>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/sgi-gru/grufault.c68
1 files changed, 44 insertions, 24 deletions
diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c
index 8ae426edc85..bf6e9f7bed5 100644
--- a/drivers/misc/sgi-gru/grufault.c
+++ b/drivers/misc/sgi-gru/grufault.c
@@ -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)
- goto failinval;
-
- /*
- * 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))
+ ret = gru_vtop(gts, vaddr, write, atomic, &gpa, &pageshift);
+ if (ret == -1)
goto failinval;
+ if (ret == -2)
+ goto failupm;
- 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));