This patch reads and stores host bridge resources reported by
ACPI BIOS for x86_64 systems. This is needed since ACPI hotplug
code now uses the PCI core for resource management. This patch
simply adds the boot parameter (acpi=root_resources) to enable
the functionality that is implemented in arch/i386.
Signed-off-by: Rajesh Shah <[email protected]>
Index: linux-2.6.12-rc4-mm2/include/asm-x86_64/acpi.h
===================================================================
--- linux-2.6.12-rc4-mm2.orig/include/asm-x86_64/acpi.h
+++ linux-2.6.12-rc4-mm2/include/asm-x86_64/acpi.h
@@ -143,10 +143,16 @@ static inline void acpi_disable_pci(void
acpi_noirq_set();
}
extern int acpi_irq_balance_set(char *str);
+extern int acpi_read_root_resources;
+static inline void acpi_set_read_root_resources(void)
+{
+ acpi_read_root_resources = 1;
+}
#else
static inline void acpi_noirq_set(void) { }
static inline void acpi_disable_pci(void) { }
static inline int acpi_irq_balance_set(char *str) { return 0; }
+static inline void acpi_set_read_root_resources(void) { }
#endif
#ifdef CONFIG_ACPI_SLEEP
Index: linux-2.6.12-rc4-mm2/arch/x86_64/kernel/setup.c
===================================================================
--- linux-2.6.12-rc4-mm2.orig/arch/x86_64/kernel/setup.c
+++ linux-2.6.12-rc4-mm2/arch/x86_64/kernel/setup.c
@@ -319,6 +319,9 @@ static __init void parse_cmdline_early (
acpi_disable_pci();
else if (!memcmp(from, "acpi=noirq", 10))
acpi_noirq_set();
+ /* Use ACPI to read host bridge resources */
+ else if (!memcmp(from, "acpi=root_resources", 19))
+ acpi_set_read_root_resources();
else if (!memcmp(from, "acpi_sci=edge", 13))
acpi_sci_flags.trigger = 1;
--
-
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