linux-kernel - [RFC 4/6] powerpc/hv-24x7: Handle migration case of lpar for proper system information in sysfs

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Message-Id: <20200117124620.26094-5-kjain@linux.ibm.com>
Date:   Fri, 17 Jan 2020 18:16:18 +0530
From:   Kajol Jain <kjain@...ux.ibm.com>
To:     acme@...nel.org, mpe@...erman.id.au, linuxppc-dev@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        anju@...ux.vnet.ibm.com, maddy@...ux.vnet.ibm.com,
        ravi.bangoria@...ux.ibm.com, peterz@...radead.org,
        yao.jin@...ux.intel.com, ak@...ux.intel.com, jolsa@...nel.org,
        kan.liang@...ux.intel.com, jmario@...hat.com,
        alexander.shishkin@...ux.intel.com, mingo@...nel.org,
        paulus@...abs.org, namhyung@...nel.org, mpetlan@...hat.com,
        gregkh@...uxfoundation.org, kjain@...ux.ibm.com,
        benh@...nel.crashing.org
Subject: [RFC 4/6] powerpc/hv-24x7: Handle migration case of lpar for proper system information in sysfs

Function 'read_sys_info_pseries()' is added to get system parameter
values like number of sockets and chips per socket.
and it gets these details via rtas_call with token
"PROCESSOR_MODULE_INFO".

Incase lpar migrate from one system to another, system
parameter details like chips per sockets or number of sockets might
change. So, it needs to be re-initialized otherwise, these values
corresponds to previous system values.
This patch adds a call to 'read_sys_info_pseries()' from
'post-mobility_fixup()' to re-init the physsockets and physchips values.

Signed-off-by: Kajol Jain <kjain@...ux.ibm.com>
---
 arch/powerpc/platforms/pseries/mobility.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/powerpc/platforms/pseries/mobility.c b/arch/powerpc/platforms/pseries/mobility.c
index b571285f6c14..226accd6218b 100644
--- a/arch/powerpc/platforms/pseries/mobility.c
+++ b/arch/powerpc/platforms/pseries/mobility.c
@@ -371,6 +371,18 @@ void post_mobility_fixup(void)
 	/* Possibly switch to a new RFI flush type */
 	pseries_setup_rfi_flush();
 
+	/*
+	 * Incase lpar migrate from one system to another, system
+	 * parameter details like chips per sockets and number of sockets
+	 * might change. So, it needs to be re-initialized otherwise these
+	 * values corresponds to previous system.
+	 * Here, adding a call to read_sys_info_pseries() declared in
+	 * platforms/pseries/pseries.h to re-init the physsockets and
+	 * physchips value.
+	 */
+	if (IS_ENABLED(CONFIG_HV_PERF_CTRS) && IS_ENABLED(CONFIG_PPC_RTAS))
+		read_sys_info_pseries();
+
 	return;
 }
 
-- 
2.18.1