@@ -27,3 +27,13 @@ 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.
@@ -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
new file mode 100644
@@ -0,0 +1,140 @@
+/*
+ * 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 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.
+ */
+#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>
+
+struct perchip_nest_info nest_perchip_info[IMC_MAX_CHIPS];
+
+/*
+ * imc_pmu_setup : Setup the IMC PMUs (children of "parent").
+ */
+static void __init imc_pmu_setup(struct device_node *parent)
+{
+ if (!parent)
+ return;
+}
+
+static int opal_imc_counters_probe(struct platform_device *pdev)
+{
+ struct device_node *imc_dev, *dn, *rm_node = NULL;
+ struct perchip_nest_info *pcni;
+ u32 pages, nest_offset, nest_size, chip_id;
+ int i = 0;
+ const __be32 *addrp;
+ u64 reg_addr, reg_size;
+
+ 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;
+
+ /*
+ * Nest counter data are saved in a reserved memory called HOMER.
+ * "imc-nest-offset" identifies the counter data location within HOMER.
+ * size : size of the entire nest-counters region
+ */
+ if (of_property_read_u32(imc_dev, "imc-nest-offset", &nest_offset))
+ goto err;
+
+ if (of_property_read_u32(imc_dev, "imc-nest-size", &nest_size))
+ goto err;
+
+ /* Sanity check */
+ if ((nest_size/PAGE_SIZE) > IMC_NEST_MAX_PAGES)
+ goto err;
+
+ /* Find the "HOMER region" for each chip */
+ rm_node = of_find_node_by_path("/reserved-memory");
+ if (!rm_node)
+ goto err;
+
+ /*
+ * We need to look for the "ibm,homer-image" node in the
+ * "/reserved-memory" node.
+ */
+ for (dn = of_find_node_by_name(rm_node, "ibm,homer-image"); dn;
+ dn = of_find_node_by_name(dn, "ibm,homer-image")) {
+
+ /* Get the chip id to which the above homer region belongs to */
+ if (of_property_read_u32(dn, "ibm,chip-id", &chip_id))
+ goto err;
+
+ pcni = &nest_perchip_info[chip_id];
+ addrp = of_get_address(dn, 0, ®_size, NULL);
+ if (!addrp)
+ goto err;
+
+ /* Fetch the homer region base address */
+ reg_addr = of_read_number(addrp, 2);
+ pcni->pbase = reg_addr;
+ /* Add the nest IMC Base offset */
+ pcni->pbase = pcni->pbase + nest_offset;
+ /* Fetch the size of the homer region */
+ pcni->size = nest_size;
+
+ for (i = 0; i < (pcni->size / PAGE_SIZE); i++) {
+ pages = PAGE_SIZE * i;
+ pcni->vbase[i] = (u64)phys_to_virt(pcni->pbase + pages);
+ }
+ }
+
+ imc_pmu_setup(imc_dev);
+
+ return 0;
+err:
+ return -ENODEV;
+}
+
+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");
@@ -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"
@@ -631,6 +633,17 @@ 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;
@@ -704,6 +717,11 @@ 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) {