GRU driver: minor updates
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>
diff --git a/drivers/misc/sgi-gru/gru.h b/drivers/misc/sgi-gru/gru.h
index 40df7cb..f93f03a 100644
--- a/drivers/misc/sgi-gru/gru.h
+++ b/drivers/misc/sgi-gru/gru.h
@@ -30,9 +30,9 @@
/*
* Size used to map GRU GSeg
*/
-#if defined CONFIG_IA64
+#if defined(CONFIG_IA64)
#define GRU_GSEG_PAGESIZE (256 * 1024UL)
-#elif defined CONFIG_X86_64
+#elif defined(CONFIG_X86_64)
#define GRU_GSEG_PAGESIZE (256 * 1024UL) /* ZZZ 2MB ??? */
#else
#error "Unsupported architecture"
diff --git a/drivers/misc/sgi-gru/gru_instructions.h b/drivers/misc/sgi-gru/gru_instructions.h
index 0dc3622..48762e7 100644
--- a/drivers/misc/sgi-gru/gru_instructions.h
+++ b/drivers/misc/sgi-gru/gru_instructions.h
@@ -26,7 +26,7 @@
* Architecture dependent functions
*/
-#if defined CONFIG_IA64
+#if defined(CONFIG_IA64)
#include <linux/compiler.h>
#include <asm/intrinsics.h>
#define __flush_cache(p) ia64_fc(p)
@@ -36,7 +36,7 @@
barrier(); \
*((volatile int *)(p)) = v; /* force st.rel */ \
} while (0)
-#elif defined CONFIG_X86_64
+#elif defined(CONFIG_X86_64)
#define __flush_cache(p) clflush(p)
#define gru_ordered_store_int(p,v) \
do { \
@@ -299,6 +299,7 @@
static inline void gru_start_instruction(struct gru_instruction *ins, int op32)
{
gru_ordered_store_int(ins, op32);
+ gru_flush_cache(ins);
}
@@ -604,8 +605,9 @@
static inline int gru_check_status(void *cb)
{
struct gru_control_block_status *cbs = (void *)cb;
- int ret = cbs->istatus;
+ int ret;
+ ret = cbs->istatus;
if (ret == CBS_CALL_OS)
ret = gru_check_status_proc(cb);
return ret;
@@ -617,7 +619,7 @@
static inline int gru_wait(void *cb)
{
struct gru_control_block_status *cbs = (void *)cb;
- int ret = cbs->istatus;;
+ int ret = cbs->istatus;
if (ret != CBS_IDLE)
ret = gru_wait_proc(cb);
diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c
index 3d33015..8c389d60 100644
--- a/drivers/misc/sgi-gru/grufault.c
+++ b/drivers/misc/sgi-gru/grufault.c
@@ -214,12 +214,14 @@
}
/*
- *
* 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 @@
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 @@
#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 @@
* 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 @@
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;
diff --git a/drivers/misc/sgi-gru/grufile.c b/drivers/misc/sgi-gru/grufile.c
index d61cee7..5c027b6 100644
--- a/drivers/misc/sgi-gru/grufile.c
+++ b/drivers/misc/sgi-gru/grufile.c
@@ -113,7 +113,7 @@
return -EPERM;
if (vma->vm_start & (GRU_GSEG_PAGESIZE - 1) ||
- vma->vm_end & (GRU_GSEG_PAGESIZE - 1))
+ vma->vm_end & (GRU_GSEG_PAGESIZE - 1))
return -EINVAL;
vma->vm_flags |=
@@ -398,6 +398,12 @@
irq = get_base_irq();
for (chip = 0; chip < GRU_CHIPLETS_PER_BLADE; chip++) {
ret = request_irq(irq + chip, gru_intr, 0, id, NULL);
+ /* TODO: fix irq handling on x86. For now ignore failures because
+ * interrupts are not required & not yet fully supported */
+ if (ret) {
+ printk("!!!WARNING: GRU ignoring request failure!!!\n");
+ ret = 0;
+ }
if (ret) {
printk(KERN_ERR "%s: request_irq failed\n",
GRU_DRIVER_ID_STR);
diff --git a/drivers/misc/sgi-gru/gruhandles.h b/drivers/misc/sgi-gru/gruhandles.h
index d16031d..b63018d 100644
--- a/drivers/misc/sgi-gru/gruhandles.h
+++ b/drivers/misc/sgi-gru/gruhandles.h
@@ -91,12 +91,7 @@
#define GSEGPOFF(h) ((h) & (GRU_SIZE - 1))
/* Convert an arbitrary handle address to the beginning of the GRU segment */
-#ifndef __PLUGIN__
#define GRUBASE(h) ((void *)((unsigned long)(h) & ~(GRU_SIZE - 1)))
-#else
-extern void *gmu_grubase(void *h);
-#define GRUBASE(h) gmu_grubase(h)
-#endif
/* General addressing macros. */
static inline void *get_gseg_base_address(void *base, int ctxnum)
diff --git a/drivers/misc/sgi-gru/grukservices.c b/drivers/misc/sgi-gru/grukservices.c
index 08d29cd..880c55d 100644
--- a/drivers/misc/sgi-gru/grukservices.c
+++ b/drivers/misc/sgi-gru/grukservices.c
@@ -122,6 +122,7 @@
struct gru_control_block_extended *cbe;
cbe = get_cbe(GRUBASE(cb), get_cb_number(cb));
+ prefetchw(cbe); /* Harmless on hardware, required for emulator */
excdet->opc = cbe->opccpy;
excdet->exopc = cbe->exopccpy;
excdet->ecause = cbe->ecause;
diff --git a/drivers/misc/sgi-gru/grumain.c b/drivers/misc/sgi-gru/grumain.c
index 0eeb8dd..e11e1ac 100644
--- a/drivers/misc/sgi-gru/grumain.c
+++ b/drivers/misc/sgi-gru/grumain.c
@@ -432,7 +432,22 @@
return GRU_HANDLE_BYTES;
}
-/* rewrite in assembly & use lots of prefetch */
+static void gru_prefetch_context(void *gseg, void *cb, void *cbe, unsigned long cbrmap,
+ unsigned long length)
+{
+ int i, scr;
+
+ prefetch_data(gseg + GRU_DS_BASE, length / GRU_CACHE_LINE_BYTES,
+ GRU_CACHE_LINE_BYTES);
+
+ for_each_cbr_in_allocation_map(i, &cbrmap, scr) {
+ prefetch_data(cb, 1, GRU_CACHE_LINE_BYTES);
+ prefetch_data(cbe + i * GRU_HANDLE_STRIDE, 1,
+ GRU_CACHE_LINE_BYTES);
+ cb += GRU_HANDLE_STRIDE;
+ }
+}
+
static void gru_load_context_data(void *save, void *grubase, int ctxnum,
unsigned long cbrmap, unsigned long dsrmap)
{
@@ -441,20 +456,11 @@
int i, scr;
gseg = grubase + ctxnum * GRU_GSEG_STRIDE;
- length = hweight64(dsrmap) * GRU_DSR_AU_BYTES;
- prefetch_data(gseg + GRU_DS_BASE, length / GRU_CACHE_LINE_BYTES,
- GRU_CACHE_LINE_BYTES);
-
cb = gseg + GRU_CB_BASE;
cbe = grubase + GRU_CBE_BASE;
- for_each_cbr_in_allocation_map(i, &cbrmap, scr) {
- prefetch_data(cb, 1, GRU_CACHE_LINE_BYTES);
- prefetch_data(cbe + i * GRU_HANDLE_STRIDE, 1,
- GRU_CACHE_LINE_BYTES);
- cb += GRU_HANDLE_STRIDE;
- }
+ length = hweight64(dsrmap) * GRU_DSR_AU_BYTES;
+ gru_prefetch_context(gseg, cb, cbe, cbrmap, length);
- cb = gseg + GRU_CB_BASE;
for_each_cbr_in_allocation_map(i, &cbrmap, scr) {
save += gru_copy_handle(cb, save);
save += gru_copy_handle(cbe + i * GRU_HANDLE_STRIDE, save);
@@ -472,15 +478,16 @@
int i, scr;
gseg = grubase + ctxnum * GRU_GSEG_STRIDE;
-
cb = gseg + GRU_CB_BASE;
cbe = grubase + GRU_CBE_BASE;
+ length = hweight64(dsrmap) * GRU_DSR_AU_BYTES;
+ gru_prefetch_context(gseg, cb, cbe, cbrmap, length);
+
for_each_cbr_in_allocation_map(i, &cbrmap, scr) {
save += gru_copy_handle(save, cb);
save += gru_copy_handle(save, cbe + i * GRU_HANDLE_STRIDE);
cb += GRU_HANDLE_STRIDE;
}
- length = hweight64(dsrmap) * GRU_DSR_AU_BYTES;
memcpy(save, gseg + GRU_DS_BASE, length);
}