From: Anju T Sudhakar <a...@linux.vnet.ibm.com>

Code to create platform device for the IMC counters.
Paltform devices are created based on the IMC compatibility
string.

New Config flag "CONFIG_HV_PERF_IMC_CTRS" add to contain the
IMC counter changes.

Signed-off-by: Anju T Sudhakar <a...@linux.vnet.ibm.com>
Signed-off-by: Hemant Kumar <hem...@linux.vnet.ibm.com>
Signed-off-by: Madhavan Srinivasan <ma...@linux.vnet.ibm.com>
---
 arch/powerpc/platforms/powernv/Kconfig    | 10 +++++
 arch/powerpc/platforms/powernv/Makefile   |  1 +
 arch/powerpc/platforms/powernv/opal-imc.c | 73 +++++++++++++++++++++++++++++++
 arch/powerpc/platforms/powernv/opal.c     | 18 ++++++++
 4 files changed, 102 insertions(+)
 create mode 100644 arch/powerpc/platforms/powernv/opal-imc.c

diff --git a/arch/powerpc/platforms/powernv/Kconfig 
b/arch/powerpc/platforms/powernv/Kconfig
index 6a6f4ef46b9e..543c6cd5e8d3 100644
--- a/arch/powerpc/platforms/powernv/Kconfig
+++ b/arch/powerpc/platforms/powernv/Kconfig
@@ -30,3 +30,13 @@ config OPAL_PRD
        help
          This enables the opal-prd driver, a facility to run processor
          recovery diagnostics on OpenPower machines
+
+config HV_PERF_IMC_CTRS
+       bool "Hypervisor supplied In Memory Collection PMU events (Nest & Core)"
+       default y
+       depends on PERF_EVENTS && PPC_POWERNV
+       help
+         Enable access to hypervisor supplied in-memory collection counters
+         in perf. IMC counters are available from Power9 systems.
+
+          If unsure, select Y.
diff --git a/arch/powerpc/platforms/powernv/Makefile 
b/arch/powerpc/platforms/powernv/Makefile
index b5d98cb3f482..715e531f6711 100644
--- a/arch/powerpc/platforms/powernv/Makefile
+++ b/arch/powerpc/platforms/powernv/Makefile
@@ -12,3 +12,4 @@ obj-$(CONFIG_PPC_SCOM)        += opal-xscom.o
 obj-$(CONFIG_MEMORY_FAILURE)   += opal-memory-errors.o
 obj-$(CONFIG_TRACEPOINTS)      += opal-tracepoints.o
 obj-$(CONFIG_OPAL_PRD) += opal-prd.o
+obj-$(CONFIG_HV_PERF_IMC_CTRS) += opal-imc.o
diff --git a/arch/powerpc/platforms/powernv/opal-imc.c 
b/arch/powerpc/platforms/powernv/opal-imc.c
new file mode 100644
index 000000000000..5b1045c81af4
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/opal-imc.c
@@ -0,0 +1,73 @@
+/*
+ * OPAL IMC interface detection driver
+ * Supported on POWERNV platform
+ *
+ * Copyright   (C) 2017 Madhavan Srinivasan, IBM Corporation.
+ *             (C) 2017 Anju T Sudhakar, IBM Corporation.
+ *             (C) 2017 Hemant K Shaw, IBM Corporation.
+ *
+ * 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 of the License, or 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.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/miscdevice.h>
+#include <linux/fs.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/poll.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/crash_dump.h>
+#include <asm/opal.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/cputable.h>
+#include <asm/imc-pmu.h>
+
+static int opal_imc_counters_probe(struct platform_device *pdev)
+{
+       struct device_node *imc_dev = NULL;
+
+       if (!pdev || !pdev->dev.of_node)
+               return -ENODEV;
+
+       /*
+        * Check whether this is kdump kernel. If yes, just return.
+        */
+       if (is_kdump_kernel())
+               return -ENODEV;
+
+       imc_dev = pdev->dev.of_node;
+       if (!imc_dev)
+               return -ENODEV;
+
+       return 0;
+}
+
+static const struct of_device_id opal_imc_match[] = {
+       { .compatible = IMC_DTB_COMPAT },
+       {},
+};
+
+static struct platform_driver opal_imc_driver = {
+       .driver = {
+               .name = "opal-imc-counters",
+               .of_match_table = opal_imc_match,
+       },
+       .probe = opal_imc_counters_probe,
+};
+
+MODULE_DEVICE_TABLE(of, opal_imc_match);
+module_platform_driver(opal_imc_driver);
+MODULE_DESCRIPTION("PowerNV OPAL IMC driver");
+MODULE_LICENSE("GPL");
diff --git a/arch/powerpc/platforms/powernv/opal.c 
b/arch/powerpc/platforms/powernv/opal.c
index 59684b4af4d1..fbdca259ea76 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -14,6 +14,7 @@
 #include <linux/printk.h>
 #include <linux/types.h>
 #include <linux/of.h>
+#include <linux/of_address.h>
 #include <linux/of_fdt.h>
 #include <linux/of_platform.h>
 #include <linux/interrupt.h>
@@ -30,6 +31,7 @@
 #include <asm/opal.h>
 #include <asm/firmware.h>
 #include <asm/mce.h>
+#include <asm/imc-pmu.h>
 
 #include "powernv.h"
 
@@ -705,6 +707,17 @@ static void opal_pdev_init(const char *compatible)
                of_platform_device_create(np, NULL, NULL);
 }
 
+#ifdef CONFIG_HV_PERF_IMC_CTRS
+static void __init opal_imc_init_dev(void)
+{
+       struct device_node *np;
+
+       np = of_find_compatible_node(NULL, NULL, IMC_DTB_COMPAT);
+       if (np)
+               of_platform_device_create(np, NULL, NULL);
+}
+#endif
+
 static int kopald(void *unused)
 {
        unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1;
@@ -778,6 +791,11 @@ static int __init opal_init(void)
        /* Setup a heatbeat thread if requested by OPAL */
        opal_init_heartbeat();
 
+#ifdef CONFIG_HV_PERF_IMC_CTRS
+       /* Detect IMC pmu counters support and create PMUs */
+       opal_imc_init_dev();
+#endif
+
        /* Create leds platform devices */
        leds = of_find_node_by_path("/ibm,opal/leds");
        if (leds) {
-- 
2.7.4

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