From: Kajol Jain <kjain@linux.ibm.com>
To: acme@kernel.org, linuxppc-dev@lists.ozlabs.org
Cc: ravi.bangoria@linux.ibm.com, maddy@linux.vnet.ibm.com,
jmario@redhat.com, mpetlan@redhat.com, peterz@infradead.org,
gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org,
alexander.shishkin@linux.intel.com,
linux-perf-users@vger.kernel.org, ak@linux.intel.com,
yao.jin@linux.intel.com, anju@linux.vnet.ibm.com,
kjain@linux.ibm.com, jolsa@kernel.org, namhyung@kernel.org,
mingo@kernel.org, kan.liang@linux.intel.com
Subject: [PATCH 2/8] powerpc/hv-24x7: Add rtas call in hv-24x7 driver to get processor details
Date: Fri, 14 Feb 2020 16:33:29 +0530 [thread overview]
Message-ID: <20200214110335.31483-3-kjain@linux.ibm.com> (raw)
In-Reply-To: <20200214110335.31483-1-kjain@linux.ibm.com>
For hv_24x7 socket/chip level events, specific chip-id to which
the data requested should be added as part of pmu events.
But number of chips/socket in the system details are not exposed.
Patch implements read_sys_info_pseries() to get system
parameter values like number of sockets and chips per socket.
Rtas_call with token "PROCESSOR_MODULE_INFO"
is used to get these values.
Sub-sequent patch exports these values via sysfs.
Patch also make these parameters default to 1.
Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
---
arch/powerpc/perf/hv-24x7.c | 72 ++++++++++++++++++++++++
arch/powerpc/platforms/pseries/pseries.h | 3 +
2 files changed, 75 insertions(+)
diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c
index 6dbbf70232aa..4248a9d1e2ed 100644
--- a/arch/powerpc/perf/hv-24x7.c
+++ b/arch/powerpc/perf/hv-24x7.c
@@ -20,6 +20,11 @@
#include <asm/io.h>
#include <linux/byteorder/generic.h>
+#ifdef CONFIG_PPC_RTAS
+#include <asm/rtas.h>
+#include <../../platforms/pseries/pseries.h>
+#endif
+
#include "hv-24x7.h"
#include "hv-24x7-catalog.h"
#include "hv-common.h"
@@ -57,6 +62,69 @@ static bool is_physical_domain(unsigned domain)
}
}
+#ifdef CONFIG_PPC_RTAS
+#define PROCESSOR_MODULE_INFO 43
+#define PROCESSOR_MAX_LENGTH (8 * 1024)
+
+static int strbe16toh(const char *buf, int offset)
+{
+ return (buf[offset] << 8) + buf[offset + 1];
+}
+
+static u32 physsockets; /* Physical sockets */
+static u32 physchips; /* Physical chips */
+
+/*
+ * Function read_sys_info_pseries() make a rtas_call which require
+ * data buffer of size 8K. As standard 'rtas_data_buf' is of size
+ * 4K, we are adding new local buffer 'rtas_local_data_buf'.
+ */
+char rtas_local_data_buf[PROCESSOR_MAX_LENGTH] __cacheline_aligned;
+
+/*
+ * read_sys_info_pseries()
+ * Retrieve the number of sockets and chips per socket details
+ * through the get-system-parameter rtas call.
+ */
+void read_sys_info_pseries(void)
+{
+ int call_status, len, ntypes;
+
+ /*
+ * Making system parameter: chips and sockets default to 1.
+ */
+ physsockets = 1;
+ physchips = 1;
+ memset(rtas_local_data_buf, 0, PROCESSOR_MAX_LENGTH);
+ spin_lock(&rtas_data_buf_lock);
+
+ call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
+ NULL,
+ PROCESSOR_MODULE_INFO,
+ __pa(rtas_local_data_buf),
+ PROCESSOR_MAX_LENGTH);
+
+ spin_unlock(&rtas_data_buf_lock);
+
+ if (call_status != 0) {
+ pr_info("%s %s Error calling get-system-parameter (0x%x)\n",
+ __FILE__, __func__, call_status);
+ } else {
+ rtas_local_data_buf[PROCESSOR_MAX_LENGTH - 1] = '\0';
+ len = strbe16toh(rtas_local_data_buf, 0);
+ if (len < 6)
+ return;
+
+ ntypes = strbe16toh(rtas_local_data_buf, 2);
+
+ if (!ntypes)
+ return;
+ physsockets = strbe16toh(rtas_local_data_buf, 4);
+ physchips = strbe16toh(rtas_local_data_buf, 6);
+ }
+}
+#endif /* CONFIG_PPC_RTAS */
+
/* Domains for which more than one result element are returned for each event. */
static bool domain_needs_aggregation(unsigned int domain)
{
@@ -1615,6 +1683,10 @@ static int hv_24x7_init(void)
if (r)
return r;
+#ifdef CONFIG_PPC_RTAS
+ read_sys_info_pseries();
+#endif
+
return 0;
}
diff --git a/arch/powerpc/platforms/pseries/pseries.h b/arch/powerpc/platforms/pseries/pseries.h
index 13fa370a87e4..1727559ce304 100644
--- a/arch/powerpc/platforms/pseries/pseries.h
+++ b/arch/powerpc/platforms/pseries/pseries.h
@@ -19,6 +19,9 @@ extern void request_event_sources_irqs(struct device_node *np,
struct pt_regs;
extern int pSeries_system_reset_exception(struct pt_regs *regs);
+#ifdef CONFIG_PPC_RTAS
+extern void read_sys_info_pseries(void);
+#endif
extern int pSeries_machine_check_exception(struct pt_regs *regs);
extern long pseries_machine_check_realmode(struct pt_regs *regs);
--
2.18.1
next prev parent reply other threads:[~2020-02-14 11:13 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-14 11:03 [PATCH 0/8] powerpc/perf: Add json file metric support for the hv_24x7 socket/chip level events Kajol Jain
2020-02-14 11:03 ` [PATCH 1/8] powerpc/perf/hv-24x7: Fix inconsistent output values incase multiple hv-24x7 events run Kajol Jain
2020-02-14 11:03 ` Kajol Jain [this message]
2020-02-14 11:03 ` [PATCH 3/8] powerpc/hv-24x7: Add sysfs files inside hv-24x7 device to show processor details Kajol Jain
2020-02-14 11:03 ` [PATCH 4/8] Documentation/ABI: Add ABI documentation for chips and sockets Kajol Jain
2020-02-14 11:03 ` [PATCH 5/8] powerpc/hv-24x7: Update post_mobility_fixup() to handle migration Kajol Jain
2020-02-14 11:03 ` [PATCH 6/8] perf/tools: Enhance JSON/metric infrastructure to handle "?" Kajol Jain
2020-02-14 11:03 ` [PATCH 7/8] tools/perf: Enable Hz/hz prinitg for --metric-only option Kajol Jain
2020-02-14 11:03 ` [PATCH 8/8] perf/tools/pmu-events/powerpc: Add hv_24x7 socket/chip level metric events Kajol Jain
2020-02-20 9:53 ` maddy
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