sparc64: Abstract away PIC register accesses.
And, like for the PCR, allow indexing of different PIC register
numbers.
This also removes all of the non-__KERNEL__ bits from asm/perfctr.h,
nothing kernel side should include it any more.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/kernel/pcr.c b/arch/sparc/kernel/pcr.c
index 3d9ab5b..e82ae89 100644
--- a/arch/sparc/kernel/pcr.c
+++ b/arch/sparc/kernel/pcr.c
@@ -14,7 +14,6 @@
#include <asm/pcr.h>
#include <asm/nmi.h>
#include <asm/spitfire.h>
-#include <asm/perfctr.h>
/* This code is shared between various users of the performance
* counters. Users will be oprofile, pseudo-NMI watchdog, and the
@@ -65,19 +64,45 @@
u64 val;
WARN_ON_ONCE(reg_num != 0);
- read_pcr(val);
+ __asm__ __volatile__("rd %%pcr, %0" : "=r" (val));
return val;
}
static void direct_pcr_write(unsigned long reg_num, u64 val)
{
WARN_ON_ONCE(reg_num != 0);
- write_pcr(val);
+ __asm__ __volatile__("wr %0, 0x0, %%pcr" : : "r" (val));
+}
+
+static u64 direct_pic_read(unsigned long reg_num)
+{
+ u64 val;
+
+ WARN_ON_ONCE(reg_num != 0);
+ __asm__ __volatile__("rd %%pic, %0" : "=r" (val));
+ return val;
+}
+
+static void direct_pic_write(unsigned long reg_num, u64 val)
+{
+ WARN_ON_ONCE(reg_num != 0);
+
+ /* Blackbird errata workaround. See commentary in
+ * arch/sparc64/kernel/smp.c:smp_percpu_timer_interrupt()
+ * for more information.
+ */
+ __asm__ __volatile__("ba,pt %%xcc, 99f\n\t"
+ " nop\n\t"
+ ".align 64\n"
+ "99:wr %0, 0x0, %%pic\n\t"
+ "rd %%pic, %%g0" : : "r" (val));
}
static const struct pcr_ops direct_pcr_ops = {
- .read = direct_pcr_read,
- .write = direct_pcr_write,
+ .read_pcr = direct_pcr_read,
+ .write_pcr = direct_pcr_write,
+ .read_pic = direct_pic_read,
+ .write_pic = direct_pic_write,
};
static void n2_pcr_write(unsigned long reg_num, u64 val)
@@ -88,14 +113,16 @@
if (val & PCR_N2_HTRACE) {
ret = sun4v_niagara2_setperf(HV_N2_PERF_SPARC_CTL, val);
if (ret != HV_EOK)
- write_pcr(val);
+ direct_pcr_write(reg_num, val);
} else
- write_pcr(val);
+ direct_pcr_write(reg_num, val);
}
static const struct pcr_ops n2_pcr_ops = {
- .read = direct_pcr_read,
- .write = n2_pcr_write,
+ .read_pcr = direct_pcr_read,
+ .write_pcr = n2_pcr_write,
+ .read_pic = direct_pic_read,
+ .write_pic = direct_pic_write,
};
static unsigned long perf_hsvc_group;