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GRU driver: minor updates

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A few minor updates for the GRU driver.
	- documentation changes found in code reviews
	- changes to #ifdefs to make them recognized by "unifdef"
	  (used in simulator testing)
	- change GRU context load/unload to prefetch data

[akpm@linux-foundation.org: fix typo in comment]
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
2008-10-15 22:05:13 -07:00
committed by Linus Torvalds
parent ebf3f09c63
commit 923f7f6970
7 changed files with 42 additions and 32 deletions
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11
drivers/misc/sgi-gru/grufault.c
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@@ -214,12 +214,14 @@ static int non_atomic_pte_lookup(struct vm_area_struct *vma,
}
/*
*
* atomic_pte_lookup
*
* Convert a user virtual address to a physical address
* Only supports Intel large pages (2MB only) on x86_64.
* ZZZ - hugepage support is incomplete
*
* NOTE: mmap_sem is already held on entry to this function. This
* guarantees existence of the page tables.
*/
static int atomic_pte_lookup(struct vm_area_struct *vma, unsigned long vaddr,
int write, unsigned long *paddr, int *pageshift)
@@ -229,9 +231,6 @@ static int atomic_pte_lookup(struct vm_area_struct *vma, unsigned long vaddr,
pud_t *pudp;
pte_t pte;
WARN_ON(irqs_disabled()); /* ZZZ debug */
local_irq_disable();
pgdp = pgd_offset(vma->vm_mm, vaddr);
if (unlikely(pgd_none(*pgdp)))
goto err;
@@ -250,8 +249,6 @@ static int atomic_pte_lookup(struct vm_area_struct *vma, unsigned long vaddr,
#endif
pte = *pte_offset_kernel(pmdp, vaddr);
local_irq_enable();
if (unlikely(!pte_present(pte) ||
(write && (!pte_write(pte) || !pte_dirty(pte)))))
return 1;
@@ -324,6 +321,7 @@ static int gru_try_dropin(struct gru_thread_state *gts,
* 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)
@@ -543,6 +541,7 @@ int gru_get_exception_detail(unsigned long arg)
ucbnum = get_cb_number((void *)excdet.cb);
cbrnum = thread_cbr_number(gts, ucbnum);
cbe = get_cbe_by_index(gts->ts_gru, cbrnum);
prefetchw(cbe); /* Harmless on hardware, required for emulator */
excdet.opc = cbe->opccpy;
excdet.exopc = cbe->exopccpy;
excdet.ecause = cbe->ecause;