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-rw-r--r--Documentation/kernel-parameters.txt8
-rw-r--r--arch/x86/Kconfig.debug9
-rw-r--r--arch/x86/boot/compressed/misc_32.c8
-rw-r--r--arch/x86/boot/compressed/misc_64.c8
-rw-r--r--arch/x86/kernel/Makefile_322
-rw-r--r--arch/x86/kernel/Makefile_642
-rw-r--r--arch/x86/kernel/io_delay.c106
-rw-r--r--arch/x86/kernel/setup_32.c2
-rw-r--r--arch/x86/kernel/setup_64.c2
-rw-r--r--include/asm-x86/io_32.h8
-rw-r--r--include/asm-x86/io_64.h33
11 files changed, 165 insertions, 23 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 880f882160e2..9e6056058425 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -794,6 +794,14 @@ and is between 256 and 4096 characters. It is defined in the file
for translation below 32 bit and if not available
then look in the higher range.
+ io_delay= [X86-32,X86-64] I/O delay method
+ standard
+ Standard port 0x80 delay
+ alternate
+ Alternate port 0xed delay
+ udelay
+ Simple two microsecond delay
+
io7= [HW] IO7 for Marvel based alpha systems
See comment before marvel_specify_io7 in
arch/alpha/kernel/core_marvel.c.
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;
diff --git a/include/asm-x86/io_32.h b/include/asm-x86/io_32.h
index fe881cd1e6f4..a8d25c38b91c 100644
--- a/include/asm-x86/io_32.h
+++ b/include/asm-x86/io_32.h
@@ -250,10 +250,14 @@ static inline void flush_write_buffers(void)
#endif /* __KERNEL__ */
-static inline void native_io_delay(void)
+#ifndef CONFIG_UDELAY_IO_DELAY
+extern void io_delay_init(void);
+#else
+static inline void io_delay_init(void)
{
- asm volatile("outb %%al,$0x80" : : : "memory");
}
+#endif
+extern void native_io_delay(void);
#if defined(CONFIG_PARAVIRT)
#include <asm/paravirt.h>
diff --git a/include/asm-x86/io_64.h b/include/asm-x86/io_64.h
index a037b0794332..5bebaf961692 100644
--- a/include/asm-x86/io_64.h
+++ b/include/asm-x86/io_64.h
@@ -35,13 +35,24 @@
* - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
*/
-#define __SLOW_DOWN_IO "\noutb %%al,$0x80"
+#ifndef CONFIG_UDELAY_IO_DELAY
+extern void io_delay_init(void);
+#else
+static inline void io_delay_init(void)
+{
+}
+#endif
+extern void native_io_delay(void);
+static inline void slow_down_io(void)
+{
+ native_io_delay();
#ifdef REALLY_SLOW_IO
-#define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
-#else
-#define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
+ native_io_delay();
+ native_io_delay();
+ native_io_delay();
#endif
+}
/*
* Talk about misusing macros..
@@ -50,21 +61,21 @@
static inline void out##s(unsigned x value, unsigned short port) {
#define __OUT2(s,s1,s2) \
-__asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
+__asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1" : : "a" (value), "Nd" (port))
#define __OUT(s,s1,x) \
-__OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \
-__OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));} \
+__OUT1(s,x) __OUT2(s,s1,"w"); } \
+__OUT1(s##_p,x) __OUT2(s,s1,"w"); slow_down_io(); }
#define __IN1(s) \
static inline RETURN_TYPE in##s(unsigned short port) { RETURN_TYPE _v;
#define __IN2(s,s1,s2) \
-__asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
+__asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0" : "=a" (_v) : "Nd" (port))
-#define __IN(s,s1,i...) \
-__IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
-__IN1(s##_p) __IN2(s,s1,"w") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
+#define __IN(s,s1) \
+__IN1(s) __IN2(s,s1,"w"); return _v; } \
+__IN1(s##_p) __IN2(s,s1,"w"); slow_down_io(); return _v; }
#define __INS(s) \
static inline void ins##s(unsigned short port, void * addr, unsigned long count) \