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authorChris Metcalf <cmetcalf@tilera.com>2011-02-28 13:21:52 -0500
committerChris Metcalf <cmetcalf@tilera.com>2011-03-01 16:20:04 -0500
commit13371731487896a6ef158b1cd74297f40a3da4bb (patch)
treeaf09fca3fd8811340b373faaddcdb528f8a07669 /arch/tile
parent04f7a3f12e10032ee3d44df1a509dbf5b2001fce (diff)
downloadop-kernel-dev-13371731487896a6ef158b1cd74297f40a3da4bb.zip
op-kernel-dev-13371731487896a6ef158b1cd74297f40a3da4bb.tar.gz
arch/tile: fix __ndelay etc to work better
The current implementations of __ndelay and __udelay call a hypervisor service to delay, but the hypervisor service isn't actually implemented very well, and the consensus is that Linux should handle figuring this out natively and not use a hypervisor service. By converting nanoseconds to cycles, and then spinning until the cycle counter reaches the desired cycle, we get several benefits: first, we are sensitive to the actual clock speed; second, we use less power by issuing a slow SPR read once every six cycles while we delay; and third, we properly handle the case of an interrupt by exiting at the target time rather than after some number of cycles. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile')
-rw-r--r--arch/tile/include/asm/timex.h3
-rw-r--r--arch/tile/include/hv/hypervisor.h5
-rw-r--r--arch/tile/kernel/entry.S6
-rw-r--r--arch/tile/kernel/time.c10
-rw-r--r--arch/tile/lib/delay.c21
5 files changed, 34 insertions, 11 deletions
diff --git a/arch/tile/include/asm/timex.h b/arch/tile/include/asm/timex.h
index 3baf5fc..29921f0 100644
--- a/arch/tile/include/asm/timex.h
+++ b/arch/tile/include/asm/timex.h
@@ -38,6 +38,9 @@ static inline cycles_t get_cycles(void)
cycles_t get_clock_rate(void);
+/* Convert nanoseconds to core clock cycles. */
+cycles_t ns2cycles(unsigned long nsecs);
+
/* Called at cpu initialization to set some low-level constants. */
void setup_clock(void);
diff --git a/arch/tile/include/hv/hypervisor.h b/arch/tile/include/hv/hypervisor.h
index f672544..103986b 100644
--- a/arch/tile/include/hv/hypervisor.h
+++ b/arch/tile/include/hv/hypervisor.h
@@ -964,6 +964,11 @@ HV_ASIDRange hv_inquire_asid(int idx);
/** Waits for at least the specified number of nanoseconds then returns.
*
+ * NOTE: this deprecated function currently assumes a 750 MHz clock,
+ * and is thus not generally suitable for use. New code should call
+ * hv_sysconf(HV_SYSCONF_CPU_SPEED), compute a cycle count to wait for,
+ * and delay by looping while checking the cycle counter SPR.
+ *
* @param nanosecs The number of nanoseconds to sleep.
*/
void hv_nanosleep(int nanosecs);
diff --git a/arch/tile/kernel/entry.S b/arch/tile/kernel/entry.S
index fd8dc42..c3aa067 100644
--- a/arch/tile/kernel/entry.S
+++ b/arch/tile/kernel/entry.S
@@ -38,12 +38,6 @@ STD_ENTRY(kernel_execve)
jrp lr
STD_ENDPROC(kernel_execve)
-/* Delay a fixed number of cycles. */
-STD_ENTRY(__delay)
- { addi r0, r0, -1; bnzt r0, . }
- jrp lr
- STD_ENDPROC(__delay)
-
/*
* We don't run this function directly, but instead copy it to a page
* we map into every user process. See vdso_setup().
diff --git a/arch/tile/kernel/time.c b/arch/tile/kernel/time.c
index f2e156e..49a605b 100644
--- a/arch/tile/kernel/time.c
+++ b/arch/tile/kernel/time.c
@@ -224,3 +224,13 @@ int setup_profiling_timer(unsigned int multiplier)
{
return -EINVAL;
}
+
+/*
+ * Use the tile timer to convert nsecs to core clock cycles, relying
+ * on it having the same frequency as SPR_CYCLE.
+ */
+cycles_t ns2cycles(unsigned long nsecs)
+{
+ struct clock_event_device *dev = &__get_cpu_var(tile_timer);
+ return ((u64)nsecs * dev->mult) >> dev->shift;
+}
diff --git a/arch/tile/lib/delay.c b/arch/tile/lib/delay.c
index 5801b03..cdacdd1 100644
--- a/arch/tile/lib/delay.c
+++ b/arch/tile/lib/delay.c
@@ -15,20 +15,31 @@
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/thread_info.h>
-#include <asm/fixmap.h>
-#include <hv/hypervisor.h>
+#include <asm/timex.h>
void __udelay(unsigned long usecs)
{
- hv_nanosleep(usecs * 1000);
+ if (usecs > ULONG_MAX / 1000) {
+ WARN_ON_ONCE(usecs > ULONG_MAX / 1000);
+ usecs = ULONG_MAX / 1000;
+ }
+ __ndelay(usecs * 1000);
}
EXPORT_SYMBOL(__udelay);
void __ndelay(unsigned long nsecs)
{
- hv_nanosleep(nsecs);
+ cycles_t target = get_cycles();
+ target += ns2cycles(nsecs);
+ while (get_cycles() < target)
+ cpu_relax();
}
EXPORT_SYMBOL(__ndelay);
-/* FIXME: should be declared in a header somewhere. */
+void __delay(unsigned long cycles)
+{
+ cycles_t target = get_cycles() + cycles;
+ while (get_cycles() < target)
+ cpu_relax();
+}
EXPORT_SYMBOL(__delay);
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