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Message-Id: <20190910144610.752086970@stormcage.eag.rdlabs.hpecorp.net>
References: <20190910144609.909602978@stormcage.eag.rdlabs.hpecorp.net>
User-Agent: quilt/0.46-1
Date:   Tue, 10 Sep 2019 09:46:16 -0500
From:   Mike Travis <mike.travis@hpe.com>
To:     Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Borislav Petkov <bp@alien8.de>,
        Christoph Hellwig <hch@infradead.org>
Cc:     Dimitri Sivanich <dimitri.sivanich@hpe.com>,
        Russ Anderson <russ.anderson@hpe.com>,
        Hedi Berriche <hedi.berriche@hpe.com>,
        Steve Wahl <steve.wahl@hpe.com>,
        Justin Ernst <justin.ernst@hpe.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH 7/8] x86/platform/uv: Check EFI Boot to set reboot type
Content-Disposition: inline; filename=check-efi-boot
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Change to checking for EFI Boot type from previous check on if this
is a KDUMP kernel.  This allows for KDUMP kernels that can handle
EFI reboots.

Signed-off-by: Mike Travis <mike.travis@hpe.com>
Reviewed-by: Steve Wahl <steve.wahl@hpe.com>
Reviewed-by: Dimitri Sivanich <dimitri.sivanich@hpe.com>
---
 arch/x86/kernel/apic/x2apic_uv_x.c |   18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

--- linux.orig/arch/x86/kernel/apic/x2apic_uv_x.c
+++ linux/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -15,6 +15,7 @@
 #include <linux/export.h>
 #include <linux/pci.h>
 #include <linux/acpi.h>
+#include <linux/efi.h>
 
 #include <asm/e820/api.h>
 #include <asm/uv/uv_mmrs.h>
@@ -1483,6 +1484,14 @@ static void __init build_socket_tables(v
 	}
 }
 
+/* Check which reboot to use */
+static void check_efi_reboot(void)
+{
+	/* If EFI reboot not available, use ACPI reboot */
+	if (!efi_enabled(EFI_BOOT))
+		reboot_type = BOOT_ACPI;
+}
+
 /* Setup user proc fs files */
 static int proc_hubbed_show(struct seq_file *file, void *data)
 {
@@ -1571,6 +1580,8 @@ static __init int uv_system_init_hubless
 	if (rc >= 0)
 		uv_setup_proc_files(1);
 
+	check_efi_reboot();
+
 	return rc;
 }
 
@@ -1704,12 +1715,7 @@ static void __init uv_system_init_hub(vo
 	/* Register Legacy VGA I/O redirection handler: */
 	pci_register_set_vga_state(uv_set_vga_state);
 
-	/*
-	 * For a kdump kernel the reset must be BOOT_ACPI, not BOOT_EFI, as
-	 * EFI is not enabled in the kdump kernel:
-	 */
-	if (is_kdump_kernel())
-		reboot_type = BOOT_ACPI;
+	check_efi_reboot();
 }
 
 /*

--