From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/drivers/base/cpu.c | 131 ++++++++++++++++++++++++++-----------------
1 files changed, 79 insertions(+), 52 deletions(-)
diff --git a/kernel/drivers/base/cpu.c b/kernel/drivers/base/cpu.c
index 43e793f..2db1e0e 100644
--- a/kernel/drivers/base/cpu.c
+++ b/kernel/drivers/base/cpu.c
@@ -55,7 +55,7 @@
if (from_nid == NUMA_NO_NODE)
return -ENODEV;
- ret = cpu_up(cpuid);
+ ret = cpu_device_up(dev);
/*
* When hot adding memory to memoryless node and enabling a cpu
* on the node, node number of the cpu may internally change.
@@ -69,7 +69,7 @@
static int cpu_subsys_offline(struct device *dev)
{
- return cpu_down(dev->id);
+ return cpu_device_down(dev);
}
void unregister_cpu(struct cpu *cpu)
@@ -139,11 +139,11 @@
#ifdef CONFIG_KEXEC
#include <linux/kexec.h>
-static ssize_t show_crash_notes(struct device *dev, struct device_attribute *attr,
+static ssize_t crash_notes_show(struct device *dev,
+ struct device_attribute *attr,
char *buf)
{
struct cpu *cpu = container_of(dev, struct cpu, dev);
- ssize_t rc;
unsigned long long addr;
int cpunum;
@@ -156,21 +156,18 @@
* operation should be safe. No locking required.
*/
addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpunum));
- rc = sprintf(buf, "%Lx\n", addr);
- return rc;
-}
-static DEVICE_ATTR(crash_notes, 0400, show_crash_notes, NULL);
-static ssize_t show_crash_notes_size(struct device *dev,
+ return sysfs_emit(buf, "%llx\n", addr);
+}
+static DEVICE_ATTR_ADMIN_RO(crash_notes);
+
+static ssize_t crash_notes_size_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
- ssize_t rc;
-
- rc = sprintf(buf, "%zu\n", sizeof(note_buf_t));
- return rc;
+ return sysfs_emit(buf, "%zu\n", sizeof(note_buf_t));
}
-static DEVICE_ATTR(crash_notes_size, 0400, show_crash_notes_size, NULL);
+static DEVICE_ATTR_ADMIN_RO(crash_notes_size);
static struct attribute *crash_note_cpu_attrs[] = {
&dev_attr_crash_notes.attr,
@@ -231,8 +228,7 @@
static ssize_t print_cpus_kernel_max(struct device *dev,
struct device_attribute *attr, char *buf)
{
- int n = snprintf(buf, PAGE_SIZE-2, "%d\n", NR_CPUS - 1);
- return n;
+ return sysfs_emit(buf, "%d\n", NR_CPUS - 1);
}
static DEVICE_ATTR(kernel_max, 0444, print_cpus_kernel_max, NULL);
@@ -242,37 +238,37 @@
static ssize_t print_cpus_offline(struct device *dev,
struct device_attribute *attr, char *buf)
{
- int n = 0, len = PAGE_SIZE-2;
+ int len = 0;
cpumask_var_t offline;
/* display offline cpus < nr_cpu_ids */
if (!alloc_cpumask_var(&offline, GFP_KERNEL))
return -ENOMEM;
cpumask_andnot(offline, cpu_possible_mask, cpu_online_mask);
- n = scnprintf(buf, len, "%*pbl", cpumask_pr_args(offline));
+ len += sysfs_emit_at(buf, len, "%*pbl", cpumask_pr_args(offline));
free_cpumask_var(offline);
/* display offline cpus >= nr_cpu_ids */
if (total_cpus && nr_cpu_ids < total_cpus) {
- if (n && n < len)
- buf[n++] = ',';
+ len += sysfs_emit_at(buf, len, ",");
if (nr_cpu_ids == total_cpus-1)
- n += snprintf(&buf[n], len - n, "%u", nr_cpu_ids);
+ len += sysfs_emit_at(buf, len, "%u", nr_cpu_ids);
else
- n += snprintf(&buf[n], len - n, "%u-%d",
- nr_cpu_ids, total_cpus-1);
+ len += sysfs_emit_at(buf, len, "%u-%d",
+ nr_cpu_ids, total_cpus - 1);
}
- n += snprintf(&buf[n], len - n, "\n");
- return n;
+ len += sysfs_emit_at(buf, len, "\n");
+
+ return len;
}
static DEVICE_ATTR(offline, 0444, print_cpus_offline, NULL);
static ssize_t print_cpus_isolated(struct device *dev,
struct device_attribute *attr, char *buf)
{
- int n = 0, len = PAGE_SIZE-2;
+ int len;
cpumask_var_t isolated;
if (!alloc_cpumask_var(&isolated, GFP_KERNEL))
@@ -280,23 +276,19 @@
cpumask_andnot(isolated, cpu_possible_mask,
housekeeping_cpumask(HK_FLAG_DOMAIN));
- n = scnprintf(buf, len, "%*pbl\n", cpumask_pr_args(isolated));
+ len = sysfs_emit(buf, "%*pbl\n", cpumask_pr_args(isolated));
free_cpumask_var(isolated);
- return n;
+ return len;
}
static DEVICE_ATTR(isolated, 0444, print_cpus_isolated, NULL);
#ifdef CONFIG_NO_HZ_FULL
static ssize_t print_cpus_nohz_full(struct device *dev,
- struct device_attribute *attr, char *buf)
+ struct device_attribute *attr, char *buf)
{
- int n = 0, len = PAGE_SIZE-2;
-
- n = scnprintf(buf, len, "%*pbl\n", cpumask_pr_args(tick_nohz_full_mask));
-
- return n;
+ return sysfs_emit(buf, "%*pbl\n", cpumask_pr_args(tick_nohz_full_mask));
}
static DEVICE_ATTR(nohz_full, 0444, print_cpus_nohz_full, NULL);
#endif
@@ -325,22 +317,23 @@
struct device_attribute *attr,
char *buf)
{
- ssize_t n;
+ int len = 0;
u32 i;
- n = sprintf(buf, "cpu:type:" CPU_FEATURE_TYPEFMT ":feature:",
- CPU_FEATURE_TYPEVAL);
+ len += sysfs_emit_at(buf, len,
+ "cpu:type:" CPU_FEATURE_TYPEFMT ":feature:",
+ CPU_FEATURE_TYPEVAL);
for (i = 0; i < MAX_CPU_FEATURES; i++)
if (cpu_have_feature(i)) {
- if (PAGE_SIZE < n + sizeof(",XXXX\n")) {
+ if (len + sizeof(",XXXX\n") >= PAGE_SIZE) {
WARN(1, "CPU features overflow page\n");
break;
}
- n += sprintf(&buf[n], ",%04X", i);
+ len += sysfs_emit_at(buf, len, ",%04X", i);
}
- buf[n++] = '\n';
- return n;
+ len += sysfs_emit_at(buf, len, "\n");
+ return len;
}
static int cpu_uevent(struct device *dev, struct kobj_uevent_env *env)
@@ -409,6 +402,7 @@
kfree(dev);
}
+__printf(4, 0)
static struct device *
__cpu_device_create(struct device *parent, void *drvdata,
const struct attribute_group **groups,
@@ -495,7 +489,8 @@
bool cpu_is_hotpluggable(unsigned cpu)
{
struct device *dev = get_cpu_device(cpu);
- return dev && container_of(dev, struct cpu, dev)->hotpluggable;
+ return dev && container_of(dev, struct cpu, dev)->hotpluggable
+ && tick_nohz_cpu_hotpluggable(cpu);
}
EXPORT_SYMBOL_GPL(cpu_is_hotpluggable);
@@ -520,56 +515,80 @@
ssize_t __weak cpu_show_meltdown(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "Not affected\n");
+ return sysfs_emit(buf, "Not affected\n");
}
ssize_t __weak cpu_show_spectre_v1(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "Not affected\n");
+ return sysfs_emit(buf, "Not affected\n");
}
ssize_t __weak cpu_show_spectre_v2(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "Not affected\n");
+ return sysfs_emit(buf, "Not affected\n");
}
ssize_t __weak cpu_show_spec_store_bypass(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "Not affected\n");
+ return sysfs_emit(buf, "Not affected\n");
}
ssize_t __weak cpu_show_l1tf(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "Not affected\n");
+ return sysfs_emit(buf, "Not affected\n");
}
ssize_t __weak cpu_show_mds(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "Not affected\n");
+ return sysfs_emit(buf, "Not affected\n");
}
ssize_t __weak cpu_show_tsx_async_abort(struct device *dev,
struct device_attribute *attr,
char *buf)
{
- return sprintf(buf, "Not affected\n");
+ return sysfs_emit(buf, "Not affected\n");
}
ssize_t __weak cpu_show_itlb_multihit(struct device *dev,
- struct device_attribute *attr, char *buf)
+ struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "Not affected\n");
+ return sysfs_emit(buf, "Not affected\n");
}
ssize_t __weak cpu_show_srbds(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "Not affected\n");
+ return sysfs_emit(buf, "Not affected\n");
+}
+
+ssize_t __weak cpu_show_mmio_stale_data(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sysfs_emit(buf, "Not affected\n");
+}
+
+ssize_t __weak cpu_show_retbleed(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sysfs_emit(buf, "Not affected\n");
+}
+
+ssize_t __weak cpu_show_gds(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sysfs_emit(buf, "Not affected\n");
+}
+
+ssize_t __weak cpu_show_spec_rstack_overflow(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sysfs_emit(buf, "Not affected\n");
}
static DEVICE_ATTR(meltdown, 0444, cpu_show_meltdown, NULL);
@@ -581,6 +600,10 @@
static DEVICE_ATTR(tsx_async_abort, 0444, cpu_show_tsx_async_abort, NULL);
static DEVICE_ATTR(itlb_multihit, 0444, cpu_show_itlb_multihit, NULL);
static DEVICE_ATTR(srbds, 0444, cpu_show_srbds, NULL);
+static DEVICE_ATTR(mmio_stale_data, 0444, cpu_show_mmio_stale_data, NULL);
+static DEVICE_ATTR(retbleed, 0444, cpu_show_retbleed, NULL);
+static DEVICE_ATTR(gather_data_sampling, 0444, cpu_show_gds, NULL);
+static DEVICE_ATTR(spec_rstack_overflow, 0444, cpu_show_spec_rstack_overflow, NULL);
static struct attribute *cpu_root_vulnerabilities_attrs[] = {
&dev_attr_meltdown.attr,
@@ -592,6 +615,10 @@
&dev_attr_tsx_async_abort.attr,
&dev_attr_itlb_multihit.attr,
&dev_attr_srbds.attr,
+ &dev_attr_mmio_stale_data.attr,
+ &dev_attr_retbleed.attr,
+ &dev_attr_gather_data_sampling.attr,
+ &dev_attr_spec_rstack_overflow.attr,
NULL
};
--
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