[PATCH] ia64: use i386 dmi_scan.c

Enable DMI table parsing on ia64.

Andi Kleen has a patch in his x86_64 tree which enables the use of i386
dmi_scan.c on x86_64.  dmi_scan.c functions are being used by the
drivers/char/ipmi/ipmi_si_intf.c driver for autodetecting the ports or
memory spaces where the IPMI controllers may be found.

This patch adds equivalent changes for ia64 as to what is in the x86_64
tree.  In addition, I reworked the DMI detection, such that on EFI-capable
systems, it uses the efi.smbios pointer to find the table, rather than
brute-force searching from 0xF0000.  On non-EFI systems, it continues the
brute-force search.

My test system, an Intel S870BN4 'Tiger4', aka Dell PowerEdge 7250, with
latest BIOS, does not list the IPMI controller in the ACPI namespace, nor
does it have an ACPI SPMI table.  Also note, currently shipping Dell x8xx
EM64T servers don't have these either, so DMI is the only method for
obtaining the address of the IPMI controller.

Signed-off-by: Matt Domsch <Matt_Domsch@dell.com>
Acked-by: "Luck, Tony" <tony.luck@intel.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 72 insertions, 33 deletions

diff --git a/arch/i386/kernel/dmi_scan.c b/arch/i386/kernel/dmi_scan.c
index ebc8dc116c4..bfecbd46f22 100644
--- a/arch/i386/kernel/dmi_scan.c
+++ b/arch/i386/kernel/dmi_scan.c
@@ -3,6 +3,7 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/dmi.h>
+#include <linux/efi.h>
 #include <linux/bootmem.h>
 #include <linux/slab.h>
 #include <asm/dmi.h>
@@ -185,47 +186,72 @@ static void __init dmi_decode(struct dmi_header *dm)
 	}
 }
 
-void __init dmi_scan_machine(void)
+static int __init dmi_present(char __iomem *p)
 {
 	u8 buf[15];
-	char __iomem *p, *q;
+	memcpy_fromio(buf, p, 15);
+	if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) {
+		u16 num = (buf[13] << 8) | buf[12];
+		u16 len = (buf[7] << 8) | buf[6];
+		u32 base = (buf[11] << 24) | (buf[10] << 16) |
+			(buf[9] << 8) | buf[8];
 
-	/*
-	 * no iounmap() for that ioremap(); it would be a no-op, but it's
-	 * so early in setup that sucker gets confused into doing what
-	 * it shouldn't if we actually call it.
-	 */
-	p = ioremap(0xF0000, 0x10000);
-	if (p == NULL)
-		goto out;
-
-	for (q = p; q < p + 0x10000; q += 16) {
-		memcpy_fromio(buf, q, 15);
-		if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) {
-			u16 num = (buf[13] << 8) | buf[12];
-			u16 len = (buf[7] << 8) | buf[6];
-			u32 base = (buf[11] << 24) | (buf[10] << 16) |
-				   (buf[9] << 8) | buf[8];
-
-			/*
-			 * DMI version 0.0 means that the real version is taken from
-			 * the SMBIOS version, which we don't know at this point.
-			 */
-			if (buf[14] != 0)
-				printk(KERN_INFO "DMI %d.%d present.\n",
-					buf[14] >> 4, buf[14] & 0xF);
-			else
-				printk(KERN_INFO "DMI present.\n");
+		/*
+		 * DMI version 0.0 means that the real version is taken from
+		 * the SMBIOS version, which we don't know at this point.
+		 */
+		if (buf[14] != 0)
+			printk(KERN_INFO "DMI %d.%d present.\n",
+			       buf[14] >> 4, buf[14] & 0xF);
+		else
+			printk(KERN_INFO "DMI present.\n");
+		if (dmi_table(base,len, num, dmi_decode) == 0)
+			return 0;
+	}
+	return 1;
+}
 
-			if (dmi_table(base,len, num, dmi_decode) == 0)
+void __init dmi_scan_machine(void)
+{
+	char __iomem *p, *q;
+	int rc;
+
+	if (efi_enabled) {
+		if (!efi.smbios)
+			goto out;
+
+               /* This is called as a core_initcall() because it isn't
+                * needed during early boot.  This also means we can
+                * iounmap the space when we're done with it.
+		*/
+		p = dmi_ioremap((unsigned long)efi.smbios, 0x10000);
+		if (p == NULL)
+			goto out;
+
+		rc = dmi_present(p + 0x10); /* offset of _DMI_ string */
+		iounmap(p);
+		if (!rc)
+			return;
+	}
+	else {
+		/*
+		 * no iounmap() for that ioremap(); it would be a no-op, but
+		 * it's so early in setup that sucker gets confused into doing
+		 * what it shouldn't if we actually call it.
+		 */
+		p = dmi_ioremap(0xF0000, 0x10000);
+		if (p == NULL)
+			goto out;
+
+		for (q = p; q < p + 0x10000; q += 16) {
+			rc = dmi_present(q);
+			if (!rc)
 				return;
 		}
 	}
-
-out:	printk(KERN_INFO "DMI not present or invalid.\n");
+ out:	printk(KERN_INFO "DMI not present or invalid.\n");
 }
 
-
 /**
  *	dmi_check_system - check system DMI data
  *	@list: array of dmi_system_id structures to match against
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 10b6b9e7716..d790a6d9026 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -42,6 +42,10 @@ config TIME_INTERPOLATION
 	bool
 	default y
 
+config DMI
+	bool
+	default y
+
 config EFI
 	bool
 	default y
diff --git a/arch/ia64/kernel/Makefile b/arch/ia64/kernel/Makefile
index 09a0dbc17fb..59e871dae74 100644
--- a/arch/ia64/kernel/Makefile
+++ b/arch/ia64/kernel/Makefile
@@ -7,7 +7,7 @@ extra-y	:= head.o init_task.o vmlinux.lds
 obj-y := acpi.o entry.o efi.o efi_stub.o gate-data.o fsys.o ia64_ksyms.o irq.o irq_ia64.o	\
 	 irq_lsapic.o ivt.o machvec.o pal.o patch.o process.o perfmon.o ptrace.o sal.o		\
 	 salinfo.o semaphore.o setup.o signal.o sys_ia64.o time.o traps.o unaligned.o \
-	 unwind.o mca.o mca_asm.o topology.o
+	 unwind.o mca.o mca_asm.o topology.o dmi_scan.o
 
 obj-$(CONFIG_IA64_BRL_EMU)	+= brl_emu.o
 obj-$(CONFIG_IA64_GENERIC)	+= acpi-ext.o
@@ -30,6 +30,7 @@ obj-$(CONFIG_IA64_MCA_RECOVERY)	+= mca_recovery.o
 obj-$(CONFIG_KPROBES)		+= kprobes.o jprobes.o
 obj-$(CONFIG_IA64_UNCACHED_ALLOCATOR)	+= uncached.o
 mca_recovery-y			+= mca_drv.o mca_drv_asm.o
+dmi_scan-y			+= ../../i386/kernel/dmi_scan.o
 
 # The gate DSO image is built using a special linker script.
 targets += gate.so gate-syms.o
diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index eb388e271b2..a4421a66ea5 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -37,6 +37,7 @@
 #include <linux/string.h>
 #include <linux/threads.h>
 #include <linux/tty.h>
+#include <linux/dmi.h>
 #include <linux/serial.h>
 #include <linux/serial_core.h>
 #include <linux/efi.h>
@@ -887,3 +888,10 @@ check_bugs (void)
 	ia64_patch_mckinley_e9((unsigned long) __start___mckinley_e9_bundles,
 			       (unsigned long) __end___mckinley_e9_bundles);
 }
+
+static int __init run_dmi_scan(void)
+{
+	dmi_scan_machine();
+	return 0;
+}
+core_initcall(run_dmi_scan);