diff options
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/Kconfig.debug | 9 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/misc_32.c | 8 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/misc_64.c | 8 | ||||
| -rw-r--r-- | arch/x86/kernel/Makefile_32 | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/Makefile_64 | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/io_delay.c | 106 | ||||
| -rw-r--r-- | arch/x86/kernel/setup_32.c | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/setup_64.c | 2 |
8 files changed, 129 insertions, 10 deletions
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index 761ca7b5f120..40aba670fb37 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -112,4 +112,13 @@ config IOMMU_LEAK Add a simple leak tracer to the IOMMU code. This is useful when you are debugging a buggy device driver that leaks IOMMU mappings. +config UDELAY_IO_DELAY + bool "Delay I/O through udelay instead of outb" + depends on DEBUG_KERNEL + help + Make inb_p/outb_p use udelay() based delays by default. Please note + that udelay() does not have the same bus-level side-effects that + the normal outb based delay does meaning this could cause drivers + to change behaviour and/or bugs to surface. + endmenu diff --git a/arch/x86/boot/compressed/misc_32.c b/arch/x86/boot/compressed/misc_32.c index b74d60d1b2fa..288e16283ef9 100644 --- a/arch/x86/boot/compressed/misc_32.c +++ b/arch/x86/boot/compressed/misc_32.c @@ -276,10 +276,10 @@ static void putstr(const char *s) RM_SCREEN_INFO.orig_y = y; pos = (x + cols * y) * 2; /* Update cursor position */ - outb_p(14, vidport); - outb_p(0xff & (pos >> 9), vidport+1); - outb_p(15, vidport); - outb_p(0xff & (pos >> 1), vidport+1); + outb(14, vidport); + outb(0xff & (pos >> 9), vidport+1); + outb(15, vidport); + outb(0xff & (pos >> 1), vidport+1); } static void* memset(void* s, int c, unsigned n) diff --git a/arch/x86/boot/compressed/misc_64.c b/arch/x86/boot/compressed/misc_64.c index 6ea015aa65e4..43e5fcc37be9 100644 --- a/arch/x86/boot/compressed/misc_64.c +++ b/arch/x86/boot/compressed/misc_64.c @@ -269,10 +269,10 @@ static void putstr(const char *s) RM_SCREEN_INFO.orig_y = y; pos = (x + cols * y) * 2; /* Update cursor position */ - outb_p(14, vidport); - outb_p(0xff & (pos >> 9), vidport+1); - outb_p(15, vidport); - outb_p(0xff & (pos >> 1), vidport+1); + outb(14, vidport); + outb(0xff & (pos >> 9), vidport+1); + outb(15, vidport); + outb(0xff & (pos >> 1), vidport+1); } static void* memset(void* s, int c, unsigned n) diff --git a/arch/x86/kernel/Makefile_32 b/arch/x86/kernel/Makefile_32 index a7bc93c27662..0cc1981d1e38 100644 --- a/arch/x86/kernel/Makefile_32 +++ b/arch/x86/kernel/Makefile_32 @@ -8,7 +8,7 @@ CPPFLAGS_vmlinux.lds += -Ui386 obj-y := process_32.o signal_32.o entry_32.o traps_32.o irq_32.o \ ptrace_32.o time_32.o ioport_32.o ldt_32.o setup_32.o i8259_32.o sys_i386_32.o \ pci-dma_32.o i386_ksyms_32.o i387_32.o bootflag.o e820_32.o\ - quirks.o i8237.o topology.o alternative.o i8253.o tsc_32.o + quirks.o i8237.o topology.o alternative.o i8253.o tsc_32.o io_delay.o obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-y += cpu/ diff --git a/arch/x86/kernel/Makefile_64 b/arch/x86/kernel/Makefile_64 index 5a88890d8ee9..08a68f0d8fda 100644 --- a/arch/x86/kernel/Makefile_64 +++ b/arch/x86/kernel/Makefile_64 @@ -11,7 +11,7 @@ obj-y := process_64.o signal_64.o entry_64.o traps_64.o irq_64.o \ x8664_ksyms_64.o i387_64.o syscall_64.o vsyscall_64.o \ setup64.o bootflag.o e820_64.o reboot_64.o quirks.o i8237.o \ pci-dma_64.o pci-nommu_64.o alternative.o hpet.o tsc_64.o bugs_64.o \ - i8253.o + i8253.o io_delay.o obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-y += cpu/ diff --git a/arch/x86/kernel/io_delay.c b/arch/x86/kernel/io_delay.c new file mode 100644 index 000000000000..4d955e74b974 --- /dev/null +++ b/arch/x86/kernel/io_delay.c @@ -0,0 +1,106 @@ +/* + * I/O delay strategies for inb_p/outb_p + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/dmi.h> +#include <asm/io.h> + +/* + * Allow for a DMI based override of port 0x80 needed for certain HP laptops + */ +#define IO_DELAY_PORT_STD 0x80 +#define IO_DELAY_PORT_ALT 0xed + +static void standard_io_delay(void) +{ + asm volatile ("outb %%al, %0" : : "N" (IO_DELAY_PORT_STD)); +} + +static void alternate_io_delay(void) +{ + asm volatile ("outb %%al, %0" : : "N" (IO_DELAY_PORT_ALT)); +} + +/* + * 2 usecs is an upper-bound for the outb delay but note that udelay doesn't + * have the bus-level side-effects that outb does + */ +#define IO_DELAY_USECS 2 + +/* + * High on a hill was a lonely goatherd + */ +static void udelay_io_delay(void) +{ + udelay(IO_DELAY_USECS); +} + +#ifndef CONFIG_UDELAY_IO_DELAY +static void (*io_delay)(void) = standard_io_delay; +#else +static void (*io_delay)(void) = udelay_io_delay; +#endif + +/* + * Paravirt wants native_io_delay to be a constant. + */ +void native_io_delay(void) +{ + io_delay(); +} +EXPORT_SYMBOL(native_io_delay); + +#ifndef CONFIG_UDELAY_IO_DELAY +static int __init dmi_alternate_io_delay_port(const struct dmi_system_id *id) +{ + printk(KERN_NOTICE "%s: using alternate I/O delay port\n", id->ident); + io_delay = alternate_io_delay; + return 0; +} + +static struct dmi_system_id __initdata alternate_io_delay_port_dmi_table[] = { + { + .callback = dmi_alternate_io_delay_port, + .ident = "HP Pavilion dv9000z", + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"), + DMI_MATCH(DMI_BOARD_NAME, "30B9") + } + }, + { + } +}; + +static int __initdata io_delay_override; + +void __init io_delay_init(void) +{ + if (!io_delay_override) + dmi_check_system(alternate_io_delay_port_dmi_table); +} +#endif + +static int __init io_delay_param(char *s) +{ + if (!s) + return -EINVAL; + + if (!strcmp(s, "standard")) + io_delay = standard_io_delay; + else if (!strcmp(s, "alternate")) + io_delay = alternate_io_delay; + else if (!strcmp(s, "udelay")) + io_delay = udelay_io_delay; + else + return -EINVAL; + +#ifndef CONFIG_UDELAY_IO_DELAY + io_delay_override = 1; +#endif + return 0; +} + +early_param("io_delay", io_delay_param); diff --git a/arch/x86/kernel/setup_32.c b/arch/x86/kernel/setup_32.c index 9c24b45b513c..51bdc0b1b72e 100644 --- a/arch/x86/kernel/setup_32.c +++ b/arch/x86/kernel/setup_32.c @@ -648,6 +648,8 @@ void __init setup_arch(char **cmdline_p) dmi_scan_machine(); + io_delay_init();; + #ifdef CONFIG_X86_GENERICARCH generic_apic_probe(); #endif diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c index 30d94d1d5f5f..ec976edf0399 100644 --- a/arch/x86/kernel/setup_64.c +++ b/arch/x86/kernel/setup_64.c @@ -311,6 +311,8 @@ void __init setup_arch(char **cmdline_p) dmi_scan_machine(); + io_delay_init(); + #ifdef CONFIG_SMP /* setup to use the static apicid table during kernel startup */ x86_cpu_to_apicid_ptr = (void *)&x86_cpu_to_apicid_init; |
