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authorLinus Torvalds <torvalds@linux-foundation.org>2018-04-09 19:11:32 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-09 19:11:32 +0300
commit5148408a5165e2f69203fcf4481a8153837ef260 (patch)
treebaf4bceb96290b69b0eeb75a7fa7d5e754c1bb4e /arch
parentbecdce1c66b21ce1c0452e16127182ef692f47ba (diff)
parentcd0e00c106722eca40b38ebf11cf134c01901086 (diff)
downloadlinux-5148408a5165e2f69203fcf4481a8153837ef260.tar.xz
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
Diffstat (limited to 'arch')
-rw-r--r--arch/alpha/Kconfig1
-rw-r--r--arch/alpha/include/asm/io.h14
-rw-r--r--arch/alpha/kernel/Makefile2
-rw-r--r--arch/alpha/kernel/bugs.c45
-rw-r--r--arch/alpha/kernel/rtc.c101
5 files changed, 55 insertions, 108 deletions
diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index e96adcbcab41..b2022885ced8 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -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
diff --git a/arch/alpha/include/asm/io.h b/arch/alpha/include/asm/io.h
index d123ff90f7a8..4c533fc94d62 100644
--- a/arch/alpha/include/asm/io.h
+++ b/arch/alpha/include/asm/io.h
@@ -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
diff --git a/arch/alpha/kernel/Makefile b/arch/alpha/kernel/Makefile
index bf7b41fa7b01..5a74581bf0ee 100644
--- a/arch/alpha/kernel/Makefile
+++ b/arch/alpha/kernel/Makefile
@@ -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
diff --git a/arch/alpha/kernel/bugs.c b/arch/alpha/kernel/bugs.c
new file mode 100644
index 000000000000..08cc10d7fa17
--- /dev/null
+++ b/arch/alpha/kernel/bugs.c
@@ -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
diff --git a/arch/alpha/kernel/rtc.c b/arch/alpha/kernel/rtc.c
index b3da0dcda47d..1376a2867048 100644
--- a/arch/alpha/kernel/rtc.c
+++ b/arch/alpha/kernel/rtc.c
@@ -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
@@ -115,83 +115,6 @@ alpha_rtc_set_time(struct device *dev, struct rtc_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)
{
switch (cmd) {
@@ -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