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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Laura Abbott <labbott@redhat.com>
Date: Sun, 10 Feb 2019 01:27:54 +0000
Subject: [PATCH] ipmi: do not configure ipmi for HPE m400

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1670017
Brew: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=20147017

Commit 913a89f009d9 ("ipmi: Don't initialize anything in the core until
something uses it") added new locking which broke context.

    Message-id: <20180713142210.15700-1-tcamuso@redhat.com>
    Patchwork-id: 224899
    O-Subject: [RHEL8 BZ 1583537 1/1] ipmi: do not configure ipmi for HPE m400
    Bugzilla: 1583537
    RH-Acked-by: Dean Nelson <dnelson@redhat.com>
    RH-Acked-by: Al Stone <ahs3@redhat.com>
    RH-Acked-by: Mark Salter <msalter@redhat.com>

    bugzilla:https://bugzilla.redhat.com/show_bug.cgi?id=1583537
    brew: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=17150528

    RHEL-only

    The ARM-based HPE m400 reports host-side ipmi as residing in intel
    port-io space, which does not exist in ARM processors. Therefore, when
    running on an m400, host-side ipmi configuration code must simply return
    zero without trying to configure the host-side ipmi.

    This patch prevents panic on boot by averting attempts to configure
    host-side ipmi on this platform.

    Though HPE m400 is not certified with RHEL, and HPE has relegated it to
    EOL status, the platform is still used extensively in ARM development
    and test for RHEL.

    Testing:
    Boot without blacklisting ipmi and check to see that no ipmi modules
    are loaded.

    Signed-off-by: Tony Camuso <tcamuso@redhat.com>

    cc: Prarit Bhargava <prarit@redhat.com>
    cc: Brendan Conoboy <blc@redhat.com>
    cc: Jeff Bastian <jbastian@redhat.com>
    cc: Scott Herold <sherold@redhat.com>
    Signed-off-by: Herton R. Krzesinski <herton@redhat.com>

Upstream Status: RHEL only
Signed-off-by: Laura Abbott <labbott@redhat.com>
Acked-by: Tony Camuso <tcamuso@redhat.com>
Acked-by: Dean Nelson <dnelson@redhat.com>
Acked-by: Jarod Wilson <jarod@redhat.com>
Acked-by: Mark Salter <msalter@redhat.com>
---
 drivers/char/ipmi/ipmi_dmi.c        | 15 +++++++++++++++
 drivers/char/ipmi/ipmi_msghandler.c | 16 +++++++++++++++-
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/drivers/char/ipmi/ipmi_dmi.c b/drivers/char/ipmi/ipmi_dmi.c
index bbf7029e224b..cf7faa970dd6 100644
--- a/drivers/char/ipmi/ipmi_dmi.c
+++ b/drivers/char/ipmi/ipmi_dmi.c
@@ -215,6 +215,21 @@ static int __init scan_for_dmi_ipmi(void)
 {
 	const struct dmi_device *dev = NULL;

+#ifdef CONFIG_ARM64
+	/* RHEL-only
+	 * If this is ARM-based HPE m400, return now, because that platform
+	 * reports the host-side ipmi address as intel port-io space, which
+	 * does not exist in the ARM architecture.
+	 */
+	const char *dmistr = dmi_get_system_info(DMI_PRODUCT_NAME);
+
+	if (dmistr && (strcmp("ProLiant m400 Server", dmistr) == 0)) {
+		pr_debug("%s does not support host ipmi\n", dmistr);
+		return 0;
+	}
+	/* END RHEL-only */
+#endif
+
 	while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev)))
 		dmi_decode_ipmi((const struct dmi_header *) dev->device_data);

diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index 737c0b6b24ea..7901e780323b 100644
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -34,6 +34,7 @@
 #include <linux/nospec.h>
 #include <linux/vmalloc.h>
 #include <linux/delay.h>
+#include <linux/dmi.h>

 #define IPMI_DRIVER_VERSION "39.2"

@@ -5153,8 +5154,21 @@ static int __init ipmi_init_msghandler_mod(void)
 {
 	int rv;

-	pr_info("version " IPMI_DRIVER_VERSION "\n");
+#ifdef CONFIG_ARM64
+	/* RHEL-only
+	 * If this is ARM-based HPE m400, return now, because that platform
+	 * reports the host-side ipmi address as intel port-io space, which
+	 * does not exist in the ARM architecture.
+	 */
+	const char *dmistr = dmi_get_system_info(DMI_PRODUCT_NAME);

+	if (dmistr && (strcmp("ProLiant m400 Server", dmistr) == 0)) {
+		pr_debug("%s does not support host ipmi\n", dmistr);
+		return -ENOSYS;
+	}
+	/* END RHEL-only */
+#endif
+	pr_info("version " IPMI_DRIVER_VERSION "\n");
 	mutex_lock(&ipmi_interfaces_mutex);
 	rv = ipmi_register_driver();
 	mutex_unlock(&ipmi_interfaces_mutex);
-- 
2.28.0