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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mattst88/alpha 

Pull alpha updates from Matt Turner:
 "A few small changes for alpha"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mattst88/alpha:
  alpha: io: reorder barriers to guarantee writeX() and iowriteX() ordering
  alpha: Implement CPU vulnerabilities sysfs functions.
  alpha: rtc: stop validating rtc_time in .read_time
  alpha: rtc: remove unused set_mmss ops
This commit is contained in:
Linus Torvalds 2018-04-09 09:11:32 -07:00
parent becdce1c66 cd0e00c106
commit 5148408a51
5 changed files with 55 additions and 108 deletions
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1
arch/alpha/Kconfig
View File

@ -18,6 +18,7 @@ config ALPHA
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select AUDIT_ARCH
select GENERIC_CLOCKEVENTS
select GENERIC_CPU_VULNERABILITIES
select GENERIC_SMP_IDLE_THREAD
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER

14
arch/alpha/include/asm/io.h
View File

@ -341,14 +341,14 @@ extern inline unsigned int ioread16(void __iomem *addr)
extern inline void iowrite8(u8 b, void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr);
mb();
IO_CONCAT(__IO_PREFIX, iowrite8)(b, addr);
}
extern inline void iowrite16(u16 b, void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,iowrite16)(b, addr);
mb();
IO_CONCAT(__IO_PREFIX, iowrite16)(b, addr);
}
extern inline u8 inb(unsigned long port)
@ -382,8 +382,8 @@ extern inline unsigned int ioread32(void __iomem *addr)
extern inline void iowrite32(u32 b, void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,iowrite32)(b, addr);
mb();
IO_CONCAT(__IO_PREFIX, iowrite32)(b, addr);
}
extern inline u32 inl(unsigned long port)
@ -434,14 +434,14 @@ extern inline u16 readw(const volatile void __iomem *addr)
extern inline void writeb(u8 b, volatile void __iomem *addr)
{
__raw_writeb(b, addr);
mb();
__raw_writeb(b, addr);
}
extern inline void writew(u16 b, volatile void __iomem *addr)
{
__raw_writew(b, addr);
mb();
__raw_writew(b, addr);
}
#endif
@ -482,14 +482,14 @@ extern inline u64 readq(const volatile void __iomem *addr)
extern inline void writel(u32 b, volatile void __iomem *addr)
{
__raw_writel(b, addr);
mb();
__raw_writel(b, addr);
}
extern inline void writeq(u64 b, volatile void __iomem *addr)
{
__raw_writeq(b, addr);
mb();
__raw_writeq(b, addr);
}
#endif

2
arch/alpha/kernel/Makefile
View File

@ -9,7 +9,7 @@ ccflags-y := -Wno-sign-compare
obj-y := entry.o traps.o process.o osf_sys.o irq.o \
irq_alpha.o signal.o setup.o ptrace.o time.o \
systbls.o err_common.o io.o
systbls.o err_common.o io.o bugs.o
obj-$(CONFIG_VGA_HOSE) += console.o
obj-$(CONFIG_SMP) += smp.o

45
arch/alpha/kernel/bugs.c Normal file
View File

@ -0,0 +1,45 @@
#include <asm/hwrpb.h>
#include <linux/device.h>
#ifdef CONFIG_SYSFS
static int cpu_is_ev6_or_later(void)
{
struct percpu_struct *cpu;
unsigned long cputype;
cpu = (struct percpu_struct *)((char *)hwrpb + hwrpb->processor_offset);
cputype = cpu->type & 0xffffffff;
/* Include all of EV6, EV67, EV68, EV7, EV79 and EV69. */
return (cputype == EV6_CPU) || ((cputype >= EV67_CPU) && (cputype <= EV69_CPU));
}
ssize_t cpu_show_meltdown(struct device *dev,
struct device_attribute *attr, char *buf)
{
if (cpu_is_ev6_or_later())
return sprintf(buf, "Vulnerable\n");
else
return sprintf(buf, "Not affected\n");
}
ssize_t cpu_show_spectre_v1(struct device *dev,
struct device_attribute *attr, char *buf)
{
if (cpu_is_ev6_or_later())
return sprintf(buf, "Vulnerable\n");
else
return sprintf(buf, "Not affected\n");
}
ssize_t cpu_show_spectre_v2(struct device *dev,
struct device_attribute *attr, char *buf)
{
if (cpu_is_ev6_or_later())
return sprintf(buf, "Vulnerable\n");
else
return sprintf(buf, "Not affected\n");
}
#endif

101
arch/alpha/kernel/rtc.c
View File

@ -97,7 +97,7 @@ alpha_rtc_read_time(struct device *dev, struct rtc_time *tm)
tm->tm_year = year;
}
return rtc_valid_tm(tm);
return 0;
}
static int
@ -114,83 +114,6 @@ alpha_rtc_set_time(struct device *dev, struct rtc_time *tm)
return mc146818_set_time(tm);
}
static int
alpha_rtc_set_mmss(struct device *dev, time64_t nowtime)
{
int retval = 0;
int real_seconds, real_minutes, cmos_minutes;
unsigned char save_control, save_freq_select;
/* Note: This code only updates minutes and seconds. Comments
indicate this was to avoid messing with unknown time zones,
and with the epoch nonsense described above. In order for
this to work, the existing clock cannot be off by more than
15 minutes.
??? This choice is may be out of date. The x86 port does
not have problems with timezones, and the epoch processing has
now been fixed in alpha_set_rtc_time.
In either case, one can always force a full rtc update with
the userland hwclock program, so surely 15 minute accuracy
is no real burden. */
/* In order to set the CMOS clock precisely, we have to be called
500 ms after the second nowtime has started, because when
nowtime is written into the registers of the CMOS clock, it will
jump to the next second precisely 500 ms later. Check the Motorola
MC146818A or Dallas DS12887 data sheet for details. */
/* irq are locally disabled here */
spin_lock(&rtc_lock);
/* Tell the clock it's being set */
save_control = CMOS_READ(RTC_CONTROL);
CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
/* Stop and reset prescaler */
save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
cmos_minutes = CMOS_READ(RTC_MINUTES);
if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
cmos_minutes = bcd2bin(cmos_minutes);
real_seconds = nowtime % 60;
real_minutes = nowtime / 60;
if (((abs(real_minutes - cmos_minutes) + 15) / 30) & 1) {
/* correct for half hour time zone */
real_minutes += 30;
}
real_minutes %= 60;
if (abs(real_minutes - cmos_minutes) < 30) {
if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
real_seconds = bin2bcd(real_seconds);
real_minutes = bin2bcd(real_minutes);
}
CMOS_WRITE(real_seconds,RTC_SECONDS);
CMOS_WRITE(real_minutes,RTC_MINUTES);
} else {
printk_once(KERN_NOTICE
"set_rtc_mmss: can't update from %d to %d\n",
cmos_minutes, real_minutes);
retval = -1;
}
/* The following flags have to be released exactly in this order,
* otherwise the DS12887 (popular MC146818A clone with integrated
* battery and quartz) will not reset the oscillator and will not
* update precisely 500 ms later. You won't find this mentioned in
* the Dallas Semiconductor data sheets, but who believes data
* sheets anyway ... -- Markus Kuhn
*/
CMOS_WRITE(save_control, RTC_CONTROL);
CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
spin_unlock(&rtc_lock);
return retval;
}
static int
alpha_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
@ -210,7 +133,6 @@ alpha_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
static const struct rtc_class_ops alpha_rtc_ops = {
.read_time = alpha_rtc_read_time,
.set_time = alpha_rtc_set_time,
.set_mmss64 = alpha_rtc_set_mmss,
.ioctl = alpha_rtc_ioctl,
};
@ -225,7 +147,6 @@ static const struct rtc_class_ops alpha_rtc_ops = {
union remote_data {
struct rtc_time *tm;
unsigned long now;
long retval;
};
@ -267,29 +188,9 @@ remote_set_time(struct device *dev, struct rtc_time *tm)
return alpha_rtc_set_time(NULL, tm);
}
static void
do_remote_mmss(void *data)
{
union remote_data *x = data;
x->retval = alpha_rtc_set_mmss(NULL, x->now);
}
static int
remote_set_mmss(struct device *dev, time64_t now)
{
union remote_data x;
if (smp_processor_id() != boot_cpuid) {
x.now = now;
smp_call_function_single(boot_cpuid, do_remote_mmss, &x, 1);
return x.retval;
}
return alpha_rtc_set_mmss(NULL, now);
}
static const struct rtc_class_ops remote_rtc_ops = {
.read_time = remote_read_time,
.set_time = remote_set_time,
.set_mmss64 = remote_set_mmss,
.ioctl = alpha_rtc_ioctl,
};
#endif