[POWERPC] pasemi: PA6T oprofile support

Oprofile support for PA6T, kernel side.

Also rename the PA6T_SPRN.* defines to SPRN_PA6T.*.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 234 insertions, 0 deletions

diff --git a/arch/powerpc/oprofile/op_model_pa6t.c b/arch/powerpc/oprofile/op_model_pa6t.c
new file mode 100644
index 00000000000..e8a56b0adad
--- /dev/null
+++ b/arch/powerpc/oprofile/op_model_pa6t.c
@@ -0,0 +1,234 @@
+/*
+ * Copyright (C) 2006-2007 PA Semi, Inc
+ *
+ * Author: Shashi Rao, PA Semi
+ *
+ * Maintained by: Olof Johansson <olof@lixom.net>
+ *
+ * Based on arch/powerpc/oprofile/op_model_power4.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/oprofile.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/percpu.h>
+#include <asm/processor.h>
+#include <asm/cputable.h>
+#include <asm/oprofile_impl.h>
+#include <asm/reg.h>
+
+static unsigned char oprofile_running;
+
+/* mmcr values are set in pa6t_reg_setup, used in pa6t_cpu_setup */
+static u64 mmcr0_val;
+static u64 mmcr1_val;
+
+/* inited in pa6t_reg_setup */
+static u64 reset_value[OP_MAX_COUNTER];
+
+static inline u64 ctr_read(unsigned int i)
+{
+	switch (i) {
+	case 0:
+		return mfspr(SPRN_PA6T_PMC0);
+	case 1:
+		return mfspr(SPRN_PA6T_PMC1);
+	case 2:
+		return mfspr(SPRN_PA6T_PMC2);
+	case 3:
+		return mfspr(SPRN_PA6T_PMC3);
+	case 4:
+		return mfspr(SPRN_PA6T_PMC4);
+	case 5:
+		return mfspr(SPRN_PA6T_PMC5);
+	default:
+		printk(KERN_ERR "ctr_read called with bad arg %u\n", i);
+		return 0;
+	}
+}
+
+static inline void ctr_write(unsigned int i, u64 val)
+{
+	switch (i) {
+	case 0:
+		mtspr(SPRN_PA6T_PMC0, val);
+		break;
+	case 1:
+		mtspr(SPRN_PA6T_PMC1, val);
+		break;
+	case 2:
+		mtspr(SPRN_PA6T_PMC2, val);
+		break;
+	case 3:
+		mtspr(SPRN_PA6T_PMC3, val);
+		break;
+	case 4:
+		mtspr(SPRN_PA6T_PMC4, val);
+		break;
+	case 5:
+		mtspr(SPRN_PA6T_PMC5, val);
+		break;
+	default:
+		printk(KERN_ERR "ctr_write called with bad arg %u\n", i);
+		break;
+	}
+}
+
+
+/* precompute the values to stuff in the hardware registers */
+static void pa6t_reg_setup(struct op_counter_config *ctr,
+			   struct op_system_config *sys,
+			   int num_ctrs)
+{
+	int pmc;
+
+	/*
+	 * adjust the mmcr0.en[0-5] and mmcr0.inten[0-5] values obtained from the
+	 * event_mappings file by turning off the counters that the user doesn't
+	 * care about
+	 *
+	 * setup user and kernel profiling
+	 */
+	for (pmc = 0; pmc < cur_cpu_spec->num_pmcs; pmc++)
+		if (!ctr[pmc].enabled) {
+			sys->mmcr0 &= ~(0x1UL << pmc);
+			sys->mmcr0 &= ~(0x1UL << (pmc+12));
+			pr_debug("turned off counter %u\n", pmc);
+		}
+
+	if (sys->enable_kernel)
+		sys->mmcr0 |= PA6T_MMCR0_SUPEN | PA6T_MMCR0_HYPEN;
+	else
+		sys->mmcr0 &= ~(PA6T_MMCR0_SUPEN | PA6T_MMCR0_HYPEN);
+
+	if (sys->enable_user)
+		sys->mmcr0 |= PA6T_MMCR0_PREN;
+	else
+		sys->mmcr0 &= ~PA6T_MMCR0_PREN;
+
+	/*
+	 * The performance counter event settings are given in the mmcr0 and
+	 * mmcr1 values passed from the user in the op_system_config
+	 * structure (sys variable).
+	 */
+	mmcr0_val = sys->mmcr0;
+	mmcr1_val = sys->mmcr1;
+	pr_debug("mmcr0_val inited to %016lx\n", sys->mmcr0);
+	pr_debug("mmcr1_val inited to %016lx\n", sys->mmcr1);
+
+	for (pmc = 0; pmc < cur_cpu_spec->num_pmcs; pmc++) {
+		/* counters are 40 bit. Move to cputable at some point? */
+		reset_value[pmc] = (0x1UL << 39) - ctr[pmc].count;
+		pr_debug("reset_value for pmc%u inited to 0x%lx\n",
+				 pmc, reset_value[pmc]);
+	}
+}
+
+/* configure registers on this cpu */
+static void pa6t_cpu_setup(struct op_counter_config *ctr)
+{
+	u64 mmcr0 = mmcr0_val;
+	u64 mmcr1 = mmcr1_val;
+
+	/* Default is all PMCs off */
+	mmcr0 &= ~(0x3FUL);
+	mtspr(SPRN_PA6T_MMCR0, mmcr0);
+
+	/* program selected programmable events in */
+	mtspr(SPRN_PA6T_MMCR1, mmcr1);
+
+	pr_debug("setup on cpu %d, mmcr0 %016lx\n", smp_processor_id(),
+		mfspr(SPRN_PA6T_MMCR0));
+	pr_debug("setup on cpu %d, mmcr1 %016lx\n", smp_processor_id(),
+		mfspr(SPRN_PA6T_MMCR1));
+}
+
+static void pa6t_start(struct op_counter_config *ctr)
+{
+	int i;
+
+	/* Hold off event counting until rfid */
+	u64 mmcr0 = mmcr0_val | PA6T_MMCR0_HANDDIS;
+
+	for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
+		if (ctr[i].enabled)
+			ctr_write(i, reset_value[i]);
+		else
+			ctr_write(i, 0UL);
+
+	mtspr(SPRN_PA6T_MMCR0, mmcr0);
+
+	oprofile_running = 1;
+
+	pr_debug("start on cpu %d, mmcr0 %lx\n", smp_processor_id(), mmcr0);
+}
+
+static void pa6t_stop(void)
+{
+	u64 mmcr0;
+
+	/* freeze counters */
+	mmcr0 = mfspr(SPRN_PA6T_MMCR0);
+	mmcr0 |= PA6T_MMCR0_FCM0;
+	mtspr(SPRN_PA6T_MMCR0, mmcr0);
+
+	oprofile_running = 0;
+
+	pr_debug("stop on cpu %d, mmcr0 %lx\n", smp_processor_id(), mmcr0);
+}
+
+/* handle the perfmon overflow vector */
+static void pa6t_handle_interrupt(struct pt_regs *regs,
+				  struct op_counter_config *ctr)
+{
+	unsigned long pc = mfspr(SPRN_PA6T_SIAR);
+	int is_kernel = is_kernel_addr(pc);
+	u64 val;
+	int i;
+	u64 mmcr0;
+
+	/* disable perfmon counting until rfid */
+	mmcr0 = mfspr(SPRN_PA6T_MMCR0);
+	mtspr(SPRN_PA6T_MMCR0, mmcr0 | PA6T_MMCR0_HANDDIS);
+
+	/* Record samples. We've got one global bit for whether a sample
+	 * was taken, so add it for any counter that triggered overflow.
+	 */
+	for (i = 0; i < cur_cpu_spec->num_pmcs; i++) {
+		val = ctr_read(i);
+		if (val & (0x1UL << 39)) { /* Overflow bit set */
+			if (oprofile_running && ctr[i].enabled) {
+				if (mmcr0 & PA6T_MMCR0_SIARLOG)
+					oprofile_add_ext_sample(pc, regs, i, is_kernel);
+				ctr_write(i, reset_value[i]);
+			} else {
+				ctr_write(i, 0UL);
+			}
+		}
+	}
+
+	/* Restore mmcr0 to a good known value since the PMI changes it */
+	mmcr0 = mmcr0_val | PA6T_MMCR0_HANDDIS;
+	mtspr(SPRN_PA6T_MMCR0, mmcr0);
+}
+
+struct op_powerpc_model op_model_pa6t = {
+	.reg_setup		= pa6t_reg_setup,
+	.cpu_setup		= pa6t_cpu_setup,
+	.start			= pa6t_start,
+	.stop			= pa6t_stop,
+	.handle_interrupt	= pa6t_handle_interrupt,
+};