From a1dfd851b97bfefeb50e6ccf8cd2c52f9acd8fea Mon Sep 17 00:00:00 2001 From: Aaron Durbin Date: Sat, 21 Jul 2007 17:11:39 +0200 Subject: [PATCH] i386: insert HPET firmware resource after PCI enumeration has completed Insert HPET resources after pci probing has been completed in order to avoid resource conflicts with PCI resource reservation. With this change the HPET firmware resources will be identified, but it should also not cause issues when the HPET address falls on a BAR in a PCI device, and the PCI enumeration cannot reserve the resources. Signed-off-by: Aaron Durbin Cc: john stultz Cc: Thomas Gleixner Cc: Len Brown Signed-off-by: Andrew Morton Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- arch/i386/kernel/acpi/boot.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/arch/i386/kernel/acpi/boot.c b/arch/i386/kernel/acpi/boot.c index a574cd2c8b6..b87cedeaf59 100644 --- a/arch/i386/kernel/acpi/boot.c +++ b/arch/i386/kernel/acpi/boot.c @@ -618,6 +618,8 @@ static int __init acpi_parse_sbf(struct acpi_table_header *table) #ifdef CONFIG_HPET_TIMER #include +static struct __initdata resource *hpet_res; + static int __init acpi_parse_hpet(struct acpi_table_header *table) { struct acpi_table_hpet *hpet_tbl; @@ -638,8 +640,42 @@ static int __init acpi_parse_hpet(struct acpi_table_header *table) printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n", hpet_tbl->id, hpet_address); + /* + * Allocate and initialize the HPET firmware resource for adding into + * the resource tree during the lateinit timeframe. + */ +#define HPET_RESOURCE_NAME_SIZE 9 + hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE); + + if (!hpet_res) + return 0; + + memset(hpet_res, 0, sizeof(*hpet_res)); + hpet_res->name = (void *)&hpet_res[1]; + hpet_res->flags = IORESOURCE_MEM; + snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u", + hpet_tbl->sequence); + + hpet_res->start = hpet_address; + hpet_res->end = hpet_address + (1 * 1024) - 1; + return 0; } + +/* + * hpet_insert_resource inserts the HPET resources used into the resource + * tree. + */ +static __init int hpet_insert_resource(void) +{ + if (!hpet_res) + return 1; + + return insert_resource(&iomem_resource, hpet_res); +} + +late_initcall(hpet_insert_resource); + #else #define acpi_parse_hpet NULL #endif -- 2.41.1