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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2017-06-02 13:52:07 +0000
committerIngo Molnar <mingo@kernel.org>2017-06-05 17:50:44 +0200
commitbb817bef3b1989a9cdb40362cfb8d2aa224ac1bc (patch)
tree6c824c3bac353dc7f94a6087574c48d5d401cac4 /drivers/firmware
parentac81d3de03f7d8593a94240d057c8e2e8e869897 (diff)
downloadlinux-bb817bef3b1989a9cdb40362cfb8d2aa224ac1bc.tar.bz2
efi/arm: Enable DMI/SMBIOS
Wire up the existing arm64 support for SMBIOS tables (aka DMI) for ARM as well, by moving the arm64 init code to drivers/firmware/efi/arm-runtime.c (which is shared between ARM and arm64), and adding a asm/dmi.h header to ARM that defines the mapping routines for the firmware tables. This allows userspace to access these tables to discover system information exposed by the firmware. It also sets the hardware name used in crash dumps, e.g.: Unable to handle kernel NULL pointer dereference at virtual address 00000000 pgd = ed3c0000 [00000000] *pgd=bf1f3835 Internal error: Oops: 817 [#1] SMP THUMB2 Modules linked in: CPU: 0 PID: 759 Comm: bash Not tainted 4.10.0-09601-g0e8f38792120-dirty #112 Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015 ^^^ NOTE: This does *NOT* enable or encourage the use of DMI quirks, i.e., the the practice of identifying the platform via DMI to decide whether certain workarounds for buggy hardware and/or firmware need to be enabled. This would require the DMI subsystem to be enabled much earlier than we do on ARM, which is non-trivial. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Russell King <rmk+kernel@armlinux.org.uk> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/20170602135207.21708-14-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/firmware')
-rw-r--r--drivers/firmware/efi/arm-runtime.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c
index 974c5a31a005..1cc41c3d6315 100644
--- a/drivers/firmware/efi/arm-runtime.c
+++ b/drivers/firmware/efi/arm-runtime.c
@@ -11,6 +11,7 @@
*
*/
+#include <linux/dmi.h>
#include <linux/efi.h>
#include <linux/io.h>
#include <linux/memblock.h>
@@ -166,3 +167,18 @@ void efi_virtmap_unload(void)
efi_set_pgd(current->active_mm);
preempt_enable();
}
+
+
+static int __init arm_dmi_init(void)
+{
+ /*
+ * On arm64/ARM, DMI depends on UEFI, and dmi_scan_machine() needs to
+ * be called early because dmi_id_init(), which is an arch_initcall
+ * itself, depends on dmi_scan_machine() having been called already.
+ */
+ dmi_scan_machine();
+ if (dmi_available)
+ dmi_set_dump_stack_arch_desc();
+ return 0;
+}
+core_initcall(arm_dmi_init);