[PATCH 09/16] cell: add low-level performance monitoring code

arnd
2006-10-24T16:42:41Z

[-- Attachment #1: cbe-pmu-regs.diff --]
[-- Type: text/plain, Size: 11138 bytes --]

From: Kevin Corry <kevcorry@us.ibm.com>

Add routines for accessing the registers and counters in the performance
monitoring unit.

Signed-off-by: Kevin Corry <kevcorry@us.ibm.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

Index: linux-2.6/arch/powerpc/platforms/cell/Makefile
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/cell/Makefile
+++ linux-2.6/arch/powerpc/platforms/cell/Makefile
@@ -1,5 +1,6 @@
obj-$(CONFIG_PPC_CELL_NATIVE) += interrupt.o iommu.o setup.o \
- cbe_regs.o spider-pic.o pervasive.o
+ cbe_regs.o spider-pic.o pervasive.o \
+ pmu.o
obj-$(CONFIG_CBE_RAS) += ras.o

ifeq ($(CONFIG_SMP),y)
Index: linux-2.6/arch/powerpc/platforms/cell/cbe_regs.h
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/cell/cbe_regs.h
+++ linux-2.6/arch/powerpc/platforms/cell/cbe_regs.h
@@ -35,6 +35,11 @@
*
*/

+/* Macros for the pm_control register. */
+#define CBE_PM_16BIT_CTR(ctr) (1 << (24 - ((ctr) & (NR_PHYS_CTRS - 1))))
+#define CBE_PM_ENABLE_PERF_MON 0x80000000
+
+
union spe_reg {
u64 val;
u8 spe[8];
Index: linux-2.6/arch/powerpc/platforms/cell/pmu.c
===================================================================
--- /dev/null
+++ linux-2.6/arch/powerpc/platforms/cell/pmu.c
@@ -0,0 +1,328 @@
+/*
+ * Cell Broadband Engine Performance Monitor
+ *
+ * (C) Copyright IBM Corporation 2001,2006
+ *
+ * Author:
+ * David Erb (djerb@us.ibm.com)
+ * Kevin Corry (kevcorry@us.ibm.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/types.h>
+#include <asm/io.h>
+#include <asm/machdep.h>
+#include <asm/reg.h>
+#include <asm/spu.h>
+
+#include "cbe_regs.h"
+#include "interrupt.h"
+#include "pmu.h"
+
+/*
+ * When writing to write-only mmio addresses, save a shadow copy. All of the
+ * registers are 32-bit, but stored in the upper-half of a 64-bit field in
+ * pmd_regs.
+ */
+
+#define WRITE_WO_MMIO(reg, x) \
+ do { \
+ u32 _x = (x); \
+ struct cbe_pmd_regs __iomem *pmd_regs; \
+ struct cbe_pmd_shadow_regs *shadow_regs; \
+ pmd_regs = cbe_get_cpu_pmd_regs(cpu); \
+ shadow_regs = cbe_get_cpu_pmd_shadow_regs(cpu); \
+ out_be64(&(pmd_regs->reg), (((u64)_x) << 32)); \
+ shadow_regs->reg = _x; \
+ } while (0)
+
+#define READ_SHADOW_REG(val, reg) \
+ do { \
+ struct cbe_pmd_shadow_regs *shadow_regs; \
+ shadow_regs = cbe_get_cpu_pmd_shadow_regs(cpu); \
+ (val) = shadow_regs->reg; \
+ } while (0)
+
+#define READ_MMIO_UPPER32(val, reg) \
+ do { \
+ struct cbe_pmd_regs __iomem *pmd_regs; \
+ pmd_regs = cbe_get_cpu_pmd_regs(cpu); \
+ (val) = (u32)(in_be64(&pmd_regs->reg) >> 32); \
+ } while (0)
+
+/*
+ * Physical counter registers.
+ * Each physical counter can act as one 32-bit counter or two 16-bit counters.
+ */
+
+u32 cbe_read_phys_ctr(u32 cpu, u32 phys_ctr)
+{
+ u32 val_in_latch, val = 0;
+
+ if (phys_ctr < NR_PHYS_CTRS) {
+ READ_SHADOW_REG(val_in_latch, counter_value_in_latch);
+
+ /* Read the latch or the actual counter, whichever is newer. */
+ if (val_in_latch & (1 << phys_ctr)) {
+ READ_SHADOW_REG(val, pm_ctr[phys_ctr]);
+ } else {
+ READ_MMIO_UPPER32(val, pm_ctr[phys_ctr]);
+ }
+ }
+
+ return val;
+}
+
+void cbe_write_phys_ctr(u32 cpu, u32 phys_ctr, u32 val)
+{
+ struct cbe_pmd_shadow_regs *shadow_regs;
+ u32 pm_ctrl;
+
+ if (phys_ctr < NR_PHYS_CTRS) {
+ /* Writing to a counter only writes to a hardware latch.
+ * The new value is not propagated to the actual counter
+ * until the performance monitor is enabled.
+ */
+ WRITE_WO_MMIO(pm_ctr[phys_ctr], val);
+
+ pm_ctrl = cbe_read_pm(cpu, pm_control);
+ if (pm_ctrl & CBE_PM_ENABLE_PERF_MON) {
+ /* The counters are already active, so we need to
+ * rewrite the pm_control register to "re-enable"
+ * the PMU.
+ */
+ cbe_write_pm(cpu, pm_control, pm_ctrl);
+ } else {
+ shadow_regs = cbe_get_cpu_pmd_shadow_regs(cpu);
+ shadow_regs->counter_value_in_latch |= (1 << phys_ctr);
+ }
+ }
+}
+
+/*
+ * "Logical" counter registers.
+ * These will read/write 16-bits or 32-bits depending on the
+ * current size of the counter. Counters 4 - 7 are always 16-bit.
+ */
+
+u32 cbe_read_ctr(u32 cpu, u32 ctr)
+{
+ u32 val;
+ u32 phys_ctr = ctr & (NR_PHYS_CTRS - 1);
+
+ val = cbe_read_phys_ctr(cpu, phys_ctr);
+
+ if (cbe_get_ctr_size(cpu, phys_ctr) == 16)
+ val = (ctr < NR_PHYS_CTRS) ? (val >> 16) : (val & 0xffff);
+
+ return val;
+}
+
+void cbe_write_ctr(u32 cpu, u32 ctr, u32 val)
+{
+ u32 phys_ctr;
+ u32 phys_val;
+
+ phys_ctr = ctr & (NR_PHYS_CTRS - 1);
+
+ if (cbe_get_ctr_size(cpu, phys_ctr) == 16) {
+ phys_val = cbe_read_phys_ctr(cpu, phys_ctr);
+
+ if (ctr < NR_PHYS_CTRS)
+ val = (val << 16) | (phys_val & 0xffff);
+ else
+ val = (val & 0xffff) | (phys_val & 0xffff0000);
+ }
+
+ cbe_write_phys_ctr(cpu, phys_ctr, val);
+}
+
+/*
+ * Counter-control registers.
+ * Each "logical" counter has a corresponding control register.
+ */
+
+u32 cbe_read_pm07_control(u32 cpu, u32 ctr)
+{
+ u32 pm07_control = 0;
+
+ if (ctr < NR_CTRS)
+ READ_SHADOW_REG(pm07_control, pm07_control[ctr]);
+
+ return pm07_control;
+}
+
+void cbe_write_pm07_control(u32 cpu, u32 ctr, u32 val)
+{
+ if (ctr < NR_CTRS)
+ WRITE_WO_MMIO(pm07_control[ctr], val);
+}
+
+/*
+ * Other PMU control registers. Most of these are write-only.
+ */
+
+u32 cbe_read_pm(u32 cpu, enum pm_reg_name reg)
+{
+ u32 val = 0;
+
+ switch (reg) {
+ case group_control:
+ READ_SHADOW_REG(val, group_control);
+ break;
+
+ case debug_bus_control:
+ READ_SHADOW_REG(val, debug_bus_control);
+ break;
+
+ case trace_address:
+ READ_MMIO_UPPER32(val, trace_address);
+ break;
+
+ case ext_tr_timer:
+ READ_SHADOW_REG(val, ext_tr_timer);
+ break;
+
+ case pm_status:
+ READ_MMIO_UPPER32(val, pm_status);
+ break;
+
+ case pm_control:
+ READ_SHADOW_REG(val, pm_control);
+ break;
+
+ case pm_interval:
+ READ_SHADOW_REG(val, pm_interval);
+ break;
+
+ case pm_start_stop:
+ READ_SHADOW_REG(val, pm_start_stop);
+ break;
+ }
+
+ return val;
+}
+
+void cbe_write_pm(u32 cpu, enum pm_reg_name reg, u32 val)
+{
+ switch (reg) {
+ case group_control:
+ WRITE_WO_MMIO(group_control, val);
+ break;
+
+ case debug_bus_control:
+ WRITE_WO_MMIO(debug_bus_control, val);
+ break;
+
+ case trace_address:
+ WRITE_WO_MMIO(trace_address, val);
+ break;
+
+ case ext_tr_timer:
+ WRITE_WO_MMIO(ext_tr_timer, val);
+ break;
+
+ case pm_status:
+ WRITE_WO_MMIO(pm_status, val);
+ break;
+
+ case pm_control:
+ WRITE_WO_MMIO(pm_control, val);
+ break;
+
+ case pm_interval:
+ WRITE_WO_MMIO(pm_interval, val);
+ break;
+
+ case pm_start_stop:
+ WRITE_WO_MMIO(pm_start_stop, val);
+ break;
+ }
+}
+
+/*
+ * Get/set the size of a physical counter to either 16 or 32 bits.
+ */
+
+u32 cbe_get_ctr_size(u32 cpu, u32 phys_ctr)
+{
+ u32 pm_ctrl, size = 0;
+
+ if (phys_ctr < NR_PHYS_CTRS) {
+ pm_ctrl = cbe_read_pm(cpu, pm_control);
+ size = (pm_ctrl & CBE_PM_16BIT_CTR(phys_ctr)) ? 16 : 32;
+ }
+
+ return size;
+}
+
+void cbe_set_ctr_size(u32 cpu, u32 phys_ctr, u32 ctr_size)
+{
+ u32 pm_ctrl;
+
+ if (phys_ctr < NR_PHYS_CTRS) {
+ pm_ctrl = cbe_read_pm(cpu, pm_control);
+ switch (ctr_size) {
+ case 16:
+ pm_ctrl |= CBE_PM_16BIT_CTR(phys_ctr);
+ break;
+
+ case 32:
+ pm_ctrl &= ~CBE_PM_16BIT_CTR(phys_ctr);
+ break;
+ }
+ cbe_write_pm(cpu, pm_control, pm_ctrl);
+ }
+}
+
+/*
+ * Enable/disable the entire performance monitoring unit.
+ * When we enable the PMU, all pending writes to counters get committed.
+ */
+
+void cbe_enable_pm(u32 cpu)
+{
+ struct cbe_pmd_shadow_regs *shadow_regs;
+ u32 pm_ctrl;
+
+ shadow_regs = cbe_get_cpu_pmd_shadow_regs(cpu);
+ shadow_regs->counter_value_in_latch = 0;
+
+ pm_ctrl = cbe_read_pm(cpu, pm_control) | CBE_PM_ENABLE_PERF_MON;
+ cbe_write_pm(cpu, pm_control, pm_ctrl);
+}
+
+void cbe_disable_pm(u32 cpu)
+{
+ u32 pm_ctrl;
+ pm_ctrl = cbe_read_pm(cpu, pm_control) & ~CBE_PM_ENABLE_PERF_MON;
+ cbe_write_pm(cpu, pm_control, pm_ctrl);
+}
+
+/*
+ * Reading from the trace_buffer.
+ * The trace buffer is two 64-bit registers. Reading from
+ * the second half automatically increments the trace_address.
+ */
+
+void cbe_read_trace_buffer(u32 cpu, u64 *buf)
+{
+ struct cbe_pmd_regs __iomem *pmd_regs = cbe_get_cpu_pmd_regs(cpu);
+
+ *buf++ = in_be64(&pmd_regs->trace_buffer_0_63);
+ *buf++ = in_be64(&pmd_regs->trace_buffer_64_127);
+}
+
Index: linux-2.6/arch/powerpc/platforms/cell/pmu.h
===================================================================
--- /dev/null
+++ linux-2.6/arch/powerpc/platforms/cell/pmu.h
@@ -0,0 +1,57 @@
+/*
+ * Cell Broadband Engine Performance Monitor
+ *
+ * (C) Copyright IBM Corporation 2001,2006
+ *
+ * Author:
+ * David Erb (djerb@us.ibm.com)
+ * Kevin Corry (kevcorry@us.ibm.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef __PERFMON_H__
+#define __PERFMON_H__
+
+enum pm_reg_name {
+ group_control,
+ debug_bus_control,
+ trace_address,
+ ext_tr_timer,
+ pm_status,
+ pm_control,
+ pm_interval,
+ pm_start_stop,
+};
+
+extern u32 cbe_read_phys_ctr(u32 cpu, u32 phys_ctr);
+extern void cbe_write_phys_ctr(u32 cpu, u32 phys_ctr, u32 val);
+extern u32 cbe_read_ctr(u32 cpu, u32 ctr);
+extern void cbe_write_ctr(u32 cpu, u32 ctr, u32 val);
+
+extern u32 cbe_read_pm07_control(u32 cpu, u32 ctr);
+extern void cbe_write_pm07_control(u32 cpu, u32 ctr, u32 val);
+extern u32 cbe_read_pm (u32 cpu, enum pm_reg_name reg);
+extern void cbe_write_pm (u32 cpu, enum pm_reg_name reg, u32 val);
+
+extern u32 cbe_get_ctr_size(u32 cpu, u32 phys_ctr);
+extern void cbe_set_ctr_size(u32 cpu, u32 phys_ctr, u32 ctr_size);
+
+extern void cbe_enable_pm(u32 cpu);
+extern void cbe_disable_pm(u32 cpu);
+
+extern void cbe_read_trace_buffer(u32 cpu, u64 *buf);
+
+#endif

--