android_kernel_motorola_sm6225/drivers/base/cpu.c
Michael Bestas 9cd6ae99b7
Merge tag 'ASB-2023-11-05_4.19-stable' of https://android.googlesource.com/kernel/common into android13-4.19-kona
https://source.android.com/docs/security/bulletin/2023-11-01

* tag 'ASB-2023-11-05_4.19-stable' of https://android.googlesource.com/kernel/common:
  Reapply "perf: Disallow mis-matched inherited group reads"
  Revert "perf: Disallow mis-matched inherited group reads"
  Revert "xfrm: fix a data-race in xfrm_gen_index()"
  Revert "Bluetooth: hci_core: Fix build warnings"
  Revert "xfrm: interface: use DEV_STATS_INC()"
  Linux 4.19.297
  xfrm6: fix inet6_dev refcount underflow problem
  Bluetooth: hci_sock: Correctly bounds check and pad HCI_MON_NEW_INDEX name
  Bluetooth: hci_sock: fix slab oob read in create_monitor_event
  phy: mapphone-mdm6600: Fix runtime PM for remove
  ASoC: pxa: fix a memory leak in probe()
  gpio: vf610: set value before the direction to avoid a glitch
  s390/pci: fix iommu bitmap allocation
  perf: Disallow mis-matched inherited group reads
  USB: serial: option: add Fibocom to DELL custom modem FM101R-GL
  USB: serial: option: add entry for Sierra EM9191 with new firmware
  USB: serial: option: add Telit LE910C4-WWX 0x1035 composition
  ACPI: irq: Fix incorrect return value in acpi_register_gsi()
  Revert "pinctrl: avoid unsafe code pattern in find_pinctrl()"
  mmc: core: Capture correct oemid-bits for eMMC cards
  mtd: spinand: micron: correct bitmask for ecc status
  mtd: rawnand: qcom: Unmap the right resource upon probe failure
  Bluetooth: hci_event: Fix using memcmp when comparing keys
  btrfs: fix some -Wmaybe-uninitialized warnings in ioctl.c
  drm: panel-orientation-quirks: Add quirk for One Mix 2S
  sky2: Make sure there is at least one frag_addr available
  wifi: cfg80211: avoid leaking stack data into trace
  wifi: mac80211: allow transmitting EAPOL frames with tainted key
  Bluetooth: hci_core: Fix build warnings
  Bluetooth: Avoid redundant authentication
  HID: holtek: fix slab-out-of-bounds Write in holtek_kbd_input_event
  tracing: relax trace_event_eval_update() execution with cond_resched()
  ata: libata-eh: Fix compilation warning in ata_eh_link_report()
  gpio: timberdale: Fix potential deadlock on &tgpio->lock
  overlayfs: set ctime when setting mtime and atime
  i2c: mux: Avoid potential false error message in i2c_mux_add_adapter
  btrfs: initialize start_slot in btrfs_log_prealloc_extents
  btrfs: return -EUCLEAN for delayed tree ref with a ref count not equals to 1
  ARM: dts: ti: omap: Fix noisy serial with overrun-throttle-ms for mapphone
  libceph: use kernel_connect()
  libceph: fix unaligned accesses in ceph_entity_addr handling
  net: pktgen: Fix interface flags printing
  netfilter: nft_set_rbtree: .deactivate fails if element has expired
  net/sched: sch_hfsc: upgrade 'rt' to 'sc' when it becomes a inner curve
  i40e: prevent crash on probe if hw registers have invalid values
  net: usb: smsc95xx: Fix an error code in smsc95xx_reset()
  tcp: tsq: relax tcp_small_queue_check() when rtx queue contains a single skb
  tcp: fix excessive TLP and RACK timeouts from HZ rounding
  net: rfkill: gpio: prevent value glitch during probe
  net: ipv6: fix return value check in esp_remove_trailer
  net: ipv4: fix return value check in esp_remove_trailer
  xfrm: interface: use DEV_STATS_INC()
  xfrm: fix a data-race in xfrm_gen_index()
  netfilter: nft_payload: fix wrong mac header matching
  KVM: x86: Mask LVTPC when handling a PMI
  regmap: fix NULL deref on lookup
  nfc: nci: fix possible NULL pointer dereference in send_acknowledge()
  Bluetooth: avoid memcmp() out of bounds warning
  Bluetooth: hci_event: Fix coding style
  Bluetooth: vhci: Fix race when opening vhci device
  Bluetooth: Fix a refcnt underflow problem for hci_conn
  Bluetooth: Reject connection with the device which has same BD_ADDR
  Bluetooth: hci_event: Ignore NULL link key
  usb: hub: Guard against accesses to uninitialized BOS descriptors
  dev_forward_skb: do not scrub skb mark within the same name space
  x86/alternatives: Disable KASAN in apply_alternatives()
  powerpc/64e: Fix wrong test in __ptep_test_and_clear_young()
  usb: gadget: ncm: Handle decoding of multiple NTB's in unwrap call
  usb: gadget: udc-xilinx: replace memcpy with memcpy_toio
  x86/cpu: Fix AMD erratum #1485 on Zen4-based CPUs
  pinctrl: avoid unsafe code pattern in find_pinctrl()
  cgroup: Remove duplicates in cgroup v1 tasks file
  Input: xpad - add PXN V900 support
  Input: psmouse - fix fast_reconnect function for PS/2 mode
  Input: powermate - fix use-after-free in powermate_config_complete
  ceph: fix incorrect revoked caps assert in ceph_fill_file_size()
  mcb: remove is_added flag from mcb_device struct
  iio: pressure: ms5611: ms5611_prom_is_valid false negative bug
  iio: pressure: bmp280: Fix NULL pointer exception
  usb: musb: Modify the "HWVers" register address
  usb: musb: Get the musb_qh poniter after musb_giveback
  usb: dwc3: Soft reset phy on probe for host
  net: usb: dm9601: fix uninitialized variable use in dm9601_mdio_read
  usb: xhci: xhci-ring: Use sysdev for mapping bounce buffer
  dmaengine: stm32-mdma: abort resume if no ongoing transfer
  sched,idle,rcu: Push rcu_idle deeper into the idle path
  workqueue: Override implicit ordered attribute in workqueue_apply_unbound_cpumask()
  nfc: nci: assert requested protocol is valid
  net: nfc: fix races in nfc_llcp_sock_get() and nfc_llcp_sock_get_sn()
  ixgbe: fix crash with empty VF macvlan list
  drm/vmwgfx: fix typo of sizeof argument
  xen-netback: use default TX queue size for vifs
  ieee802154: ca8210: Fix a potential UAF in ca8210_probe
  drm/msm/dsi: skip the wait for video mode done if not applicable
  drm: etvnaviv: fix bad backport leading to warning
  net: prevent address rewrite in kernel_bind()
  quota: Fix slow quotaoff
  HID: logitech-hidpp: Fix kernel crash on receiver USB disconnect
  RDMA/cxgb4: Check skb value for failure to allocate
  net: prevent rewrite of msg_name in sock_sendmsg()
  net: fix kernel-doc warnings for socket.c
  net: use indirect calls helpers at the socket layer
  indirect call wrappers: helpers to speed-up indirect calls of builtin
  Revert "net: add atomic_long_t to net_device_stats fields"
  Revert "net: Fix unwanted sign extension in netdev_stats_to_stats64()"
  Revert "net: bridge: use DEV_STATS_INC()"
  Linux 4.19.296
  xen/events: replace evtchn_rwlock with RCU
  rtnetlink: Reject negative ifindexes in RTM_NEWLINK
  Revert "rtnetlink: Reject negative ifindexes in RTM_NEWLINK"
  dccp: fix dccp_v4_err()/dccp_v6_err() again
  parisc: Restore __ldcw_align for PA-RISC 2.0 processors
  RDMA/mlx5: Fix NULL string error
  RDMA/cma: Fix truncation compilation warning in make_cma_ports
  gpio: pxa: disable pinctrl calls for MMP_GPIO
  gpio: aspeed: fix the GPIO number passed to pinctrl_gpio_set_config()
  IB/mlx4: Fix the size of a buffer in add_port_entries()
  cpupower: add Makefile dependencies for install targets
  sctp: update hb timer immediately after users change hb_interval
  sctp: update transport state when processing a dupcook packet
  tcp: fix delayed ACKs for MSS boundary condition
  tcp: fix quick-ack counting to count actual ACKs of new data
  net: stmmac: dwmac-stm32: fix resume on STM32 MCU
  net: usb: smsc75xx: Fix uninit-value access in __smsc75xx_read_reg
  ipv4, ipv6: Fix handling of transhdrlen in __ip{,6}_append_data()
  modpost: add missing else to the "of" check
  scsi: target: core: Fix deadlock due to recursive locking
  regmap: rbtree: Fix wrong register marked as in-cache when creating new node
  drivers/net: process the result of hdlc_open() and add call of hdlc_close() in uhdlc_close()
  wifi: mwifiex: Fix oob check condition in mwifiex_process_rx_packet
  ubi: Refuse attaching if mtd's erasesize is 0
  net: replace calls to sock->ops->connect() with kernel_connect()
  wifi: mwifiex: Fix tlv_buf_left calculation
  qed/red_ll2: Fix undefined behavior bug in struct qed_ll2_info
  scsi: zfcp: Fix a double put in zfcp_port_enqueue()
  Revert "PCI: qcom: Disable write access to read only registers for IP v2.3.3"
  media: dvb: symbol fixup for dvb_attach() - again
  Revert "drivers core: Use sysfs_emit and sysfs_emit_at for show(device *...) functions"
  ata: libata: disallow dev-initiated LPM transitions to unsupported states
  ext4: fix rec_len verify error
  fs: binfmt_elf_efpic: fix personality for ELF-FDPIC
  ata: libata-sata: increase PMP SRST timeout to 10s
  ata: libata-core: Do not register PM operations for SAS ports
  ata: libata-core: Fix port and device removal
  ata: libata-core: Fix ata_port_request_pm() locking
  net: thunderbolt: Fix TCPv6 GSO checksum calculation
  btrfs: properly report 0 avail for very full file systems
  i2c: i801: unregister tco_pdev in i801_probe() error path
  ata: libata-scsi: ignore reserved bits for REPORT SUPPORTED OPERATION CODES
  ALSA: hda: Disable power save for solving pop issue on Lenovo ThinkCentre M70q
  nilfs2: fix potential use after free in nilfs_gccache_submit_read_data()
  serial: 8250_port: Check IRQ data before use
  smack: Record transmuting in smk_transmuted
  smack: Retrieve transmuting information in smack_inode_getsecurity()
  Smack:- Use overlay inode label in smack_inode_copy_up()
  scsi: megaraid_sas: Enable msix_load_balance for Invader and later controllers
  net: Fix unwanted sign extension in netdev_stats_to_stats64()
  watchdog: iTCO_wdt: Set NO_REBOOT if the watchdog is not already running
  watchdog: iTCO_wdt: No need to stop the timer in probe
  nvme-pci: do not set the NUMA node of device if it has none
  fbdev/sh7760fb: Depend on FB=y
  bpf: Clarify error expectations from bpf_clone_redirect
  ata: libata-eh: do not clear ATA_PFLAG_EH_PENDING in ata_eh_reset()
  ring-buffer: Avoid softlockup in ring_buffer_resize()
  selftests/ftrace: Correctly enable event in instance-event.tc
  parisc: irq: Make irq_stack_union static to avoid sparse warning
  parisc: drivers: Fix sparse warning
  parisc: iosapic.c: Fix sparse warnings
  parisc: sba: Fix compile warning wrt list of SBA devices
  gpio: pmic-eic-sprd: Add can_sleep flag for PMIC EIC chip
  ARM: dts: ti: omap: motorola-mapphone: Fix abe_clkctrl warning on boot
  clk: tegra: fix error return case for recalc_rate
  MIPS: Alchemy: only build mmc support helpers if au1xmmc is enabled
  ext4: do not let fstrim block system suspend
  ext4: move setting of trimmed bit into ext4_try_to_trim_range()
  ext4: replace the traditional ternary conditional operator with with max()/min()
  ext4: mark group as trimmed only if it was fully scanned
  ext4: change s_last_trim_minblks type to unsigned long
  ext4: scope ret locally in ext4_try_to_trim_range()
  ext4: add new helper interface ext4_try_to_trim_range()
  ext4: remove the 'group' parameter of ext4_trim_extent
  scsi: megaraid_sas: Fix deadlock on firmware crashdump
  scsi: megaraid_sas: Load balance completions across all MSI-X
  scsi: qla2xxx: Remove unsupported ql2xenabledif option
  scsi: qla2xxx: Add protection mask module parameters
  Input: i8042 - add quirk for TUXEDO Gemini 17 Gen1/Clevo PD70PN
  i2c: mux: demux-pinctrl: check the return value of devm_kstrdup()
  gpio: tb10x: Fix an error handling path in tb10x_gpio_probe()
  team: fix null-ptr-deref when team device type is changed
  net: bridge: use DEV_STATS_INC()
  net: add atomic_long_t to net_device_stats fields
  net: hns3: add 5ms delay before clear firmware reset irq source
  powerpc/perf/hv-24x7: Update domain value check
  ipv4: fix null-deref in ipv4_link_failure
  selftests: tls: swap the TX and RX sockets in some tests
  selftests/tls: Add {} to avoid static checker warning
  netfilter: nf_tables: disallow element removal on anonymous sets
  ata: libahci: clear pending interrupt status
  ata: ahci: Drop pointless VPRINTK() calls and convert the remaining ones
  NFS/pNFS: Report EINVAL errors from connect() to the server
  ANDROID: ALSA: jack: Revert mismerge done in v4.19.291

 Conflicts:
	include/net/tcp.h
	kernel/events/core.c
	kernel/sched/idle.c

Change-Id: I141cc494dcfda5fbd11f8bd2f7166bf3bf157084
2023-11-09 14:55:01 +02:00

737 lines
18 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* CPU subsystem support
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/cpu.h>
#include <linux/topology.h>
#include <linux/device.h>
#include <linux/node.h>
#include <linux/gfp.h>
#include <linux/slab.h>
#include <linux/percpu.h>
#include <linux/acpi.h>
#include <linux/of.h>
#include <linux/cpufeature.h>
#include <linux/tick.h>
#include <linux/pm_qos.h>
#include <linux/sched/isolation.h>
#include "base.h"
static DEFINE_PER_CPU(struct device *, cpu_sys_devices);
static int cpu_subsys_match(struct device *dev, struct device_driver *drv)
{
/* ACPI style match is the only one that may succeed. */
if (acpi_driver_match_device(dev, drv))
return 1;
return 0;
}
#ifdef CONFIG_HOTPLUG_CPU
static void change_cpu_under_node(struct cpu *cpu,
unsigned int from_nid, unsigned int to_nid)
{
int cpuid = cpu->dev.id;
unregister_cpu_under_node(cpuid, from_nid);
register_cpu_under_node(cpuid, to_nid);
cpu->node_id = to_nid;
}
static int cpu_subsys_online(struct device *dev)
{
struct cpu *cpu = container_of(dev, struct cpu, dev);
int cpuid = dev->id;
int from_nid, to_nid;
int ret;
from_nid = cpu_to_node(cpuid);
if (from_nid == NUMA_NO_NODE)
return -ENODEV;
ret = cpu_up(cpuid);
/*
* When hot adding memory to memoryless node and enabling a cpu
* on the node, node number of the cpu may internally change.
*/
to_nid = cpu_to_node(cpuid);
if (from_nid != to_nid)
change_cpu_under_node(cpu, from_nid, to_nid);
return ret;
}
static int cpu_subsys_offline(struct device *dev)
{
return cpu_down(dev->id);
}
void unregister_cpu(struct cpu *cpu)
{
int logical_cpu = cpu->dev.id;
unregister_cpu_under_node(logical_cpu, cpu_to_node(logical_cpu));
device_unregister(&cpu->dev);
per_cpu(cpu_sys_devices, logical_cpu) = NULL;
return;
}
#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
static ssize_t cpu_probe_store(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t count)
{
ssize_t cnt;
int ret;
ret = lock_device_hotplug_sysfs();
if (ret)
return ret;
cnt = arch_cpu_probe(buf, count);
unlock_device_hotplug();
return cnt;
}
static ssize_t cpu_release_store(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t count)
{
ssize_t cnt;
int ret;
ret = lock_device_hotplug_sysfs();
if (ret)
return ret;
cnt = arch_cpu_release(buf, count);
unlock_device_hotplug();
return cnt;
}
static DEVICE_ATTR(probe, S_IWUSR, NULL, cpu_probe_store);
static DEVICE_ATTR(release, S_IWUSR, NULL, cpu_release_store);
#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
#endif /* CONFIG_HOTPLUG_CPU */
struct bus_type cpu_subsys = {
.name = "cpu",
.dev_name = "cpu",
.match = cpu_subsys_match,
#ifdef CONFIG_HOTPLUG_CPU
.online = cpu_subsys_online,
.offline = cpu_subsys_offline,
#endif
};
EXPORT_SYMBOL_GPL(cpu_subsys);
#ifdef CONFIG_KEXEC
#include <linux/kexec.h>
static ssize_t show_crash_notes(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;
cpunum = cpu->dev.id;
/*
* Might be reading other cpu's data based on which cpu read thread
* has been scheduled. But cpu data (memory) is allocated once during
* boot up and this data does not change there after. Hence this
* 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,
struct device_attribute *attr,
char *buf)
{
ssize_t rc;
rc = sprintf(buf, "%zu\n", sizeof(note_buf_t));
return rc;
}
static DEVICE_ATTR(crash_notes_size, 0400, show_crash_notes_size, NULL);
static struct attribute *crash_note_cpu_attrs[] = {
&dev_attr_crash_notes.attr,
&dev_attr_crash_notes_size.attr,
NULL
};
static struct attribute_group crash_note_cpu_attr_group = {
.attrs = crash_note_cpu_attrs,
};
#endif
#ifdef CONFIG_HOTPLUG_CPU
static ssize_t isolate_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct cpu *cpu = container_of(dev, struct cpu, dev);
ssize_t rc;
int cpuid = cpu->dev.id;
unsigned int isolated = cpu_isolated(cpuid);
rc = snprintf(buf, PAGE_SIZE-2, "%d\n", isolated);
return rc;
}
static DEVICE_ATTR_RO(isolate);
static struct attribute *cpu_isolated_attrs[] = {
&dev_attr_isolate.attr,
NULL
};
static struct attribute_group cpu_isolated_attr_group = {
.attrs = cpu_isolated_attrs,
};
#endif
static ssize_t show_sched_load_boost(struct device *dev,
struct device_attribute *attr, char *buf)
{
ssize_t rc;
unsigned int boost;
struct cpu *cpu = container_of(dev, struct cpu, dev);
int cpuid = cpu->dev.id;
boost = per_cpu(sched_load_boost, cpuid);
rc = snprintf(buf, PAGE_SIZE-2, "%d\n", boost);
return rc;
}
static ssize_t __ref store_sched_load_boost(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int err;
int boost;
struct cpu *cpu = container_of(dev, struct cpu, dev);
int cpuid = cpu->dev.id;
err = kstrtoint(strstrip((char *)buf), 0, &boost);
if (err)
return err;
/*
* -100 is low enough to cancel out CPU's load and make it near zro.
* 1000 is close to the maximum value that cpu_util_freq_{walt,pelt}
* can take without overflow.
*/
if (boost < -100 || boost > 1000)
return -EINVAL;
per_cpu(sched_load_boost, cpuid) = boost;
return count;
}
static DEVICE_ATTR(sched_load_boost, 0644,
show_sched_load_boost,
store_sched_load_boost);
static struct attribute *sched_cpu_attrs[] = {
&dev_attr_sched_load_boost.attr,
NULL
};
static struct attribute_group sched_cpu_attr_group = {
.attrs = sched_cpu_attrs,
};
static const struct attribute_group *common_cpu_attr_groups[] = {
#ifdef CONFIG_KEXEC
&crash_note_cpu_attr_group,
#endif
#ifdef CONFIG_HOTPLUG_CPU
&cpu_isolated_attr_group,
#endif
&sched_cpu_attr_group,
NULL
};
static const struct attribute_group *hotplugable_cpu_attr_groups[] = {
#ifdef CONFIG_KEXEC
&crash_note_cpu_attr_group,
#endif
#ifdef CONFIG_HOTPLUG_CPU
&cpu_isolated_attr_group,
#endif
&sched_cpu_attr_group,
NULL
};
/*
* Print cpu online, possible, present, and system maps
*/
struct cpu_attr {
struct device_attribute attr;
const struct cpumask *const map;
};
static ssize_t show_cpus_attr(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct cpu_attr *ca = container_of(attr, struct cpu_attr, attr);
return cpumap_print_to_pagebuf(true, buf, ca->map);
}
#define _CPU_ATTR(name, map) \
{ __ATTR(name, 0444, show_cpus_attr, NULL), map }
/* Keep in sync with cpu_subsys_attrs */
static struct cpu_attr cpu_attrs[] = {
_CPU_ATTR(online, &__cpu_online_mask),
_CPU_ATTR(possible, &__cpu_possible_mask),
_CPU_ATTR(present, &__cpu_present_mask),
_CPU_ATTR(core_ctl_isolated, &__cpu_isolated_mask),
};
/*
* Print values for NR_CPUS and offlined cpus
*/
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;
}
static DEVICE_ATTR(kernel_max, 0444, print_cpus_kernel_max, NULL);
/* arch-optional setting to enable display of offline cpus >= nr_cpu_ids */
unsigned int total_cpus;
static ssize_t print_cpus_offline(struct device *dev,
struct device_attribute *attr, char *buf)
{
int n = 0, len = PAGE_SIZE-2;
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));
free_cpumask_var(offline);
/* display offline cpus >= nr_cpu_ids */
if (total_cpus && nr_cpu_ids < total_cpus) {
if (n && n < len)
buf[n++] = ',';
if (nr_cpu_ids == total_cpus-1)
n += snprintf(&buf[n], len - n, "%u", nr_cpu_ids);
else
n += snprintf(&buf[n], len - n, "%u-%d",
nr_cpu_ids, total_cpus-1);
}
n += snprintf(&buf[n], len - n, "\n");
return n;
}
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;
cpumask_var_t isolated;
if (!alloc_cpumask_var(&isolated, GFP_KERNEL))
return -ENOMEM;
cpumask_andnot(isolated, cpu_possible_mask,
housekeeping_cpumask(HK_FLAG_DOMAIN));
n = scnprintf(buf, len, "%*pbl\n", cpumask_pr_args(isolated));
free_cpumask_var(isolated);
return n;
}
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)
{
int n = 0, len = PAGE_SIZE-2;
n = scnprintf(buf, len, "%*pbl\n", cpumask_pr_args(tick_nohz_full_mask));
return n;
}
static DEVICE_ATTR(nohz_full, 0444, print_cpus_nohz_full, NULL);
#endif
static void cpu_device_release(struct device *dev)
{
/*
* This is an empty function to prevent the driver core from spitting a
* warning at us. Yes, I know this is directly opposite of what the
* documentation for the driver core and kobjects say, and the author
* of this code has already been publically ridiculed for doing
* something as foolish as this. However, at this point in time, it is
* the only way to handle the issue of statically allocated cpu
* devices. The different architectures will have their cpu device
* code reworked to properly handle this in the near future, so this
* function will then be changed to correctly free up the memory held
* by the cpu device.
*
* Never copy this way of doing things, or you too will be made fun of
* on the linux-kernel list, you have been warned.
*/
}
#ifdef CONFIG_GENERIC_CPU_AUTOPROBE
static ssize_t print_cpu_modalias(struct device *dev,
struct device_attribute *attr,
char *buf)
{
ssize_t n;
u32 i;
n = sprintf(buf, "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")) {
WARN(1, "CPU features overflow page\n");
break;
}
n += sprintf(&buf[n], ",%04X", i);
}
buf[n++] = '\n';
return n;
}
static int cpu_uevent(struct device *dev, struct kobj_uevent_env *env)
{
char *buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
if (buf) {
print_cpu_modalias(NULL, NULL, buf);
add_uevent_var(env, "MODALIAS=%s", buf);
kfree(buf);
}
return 0;
}
#endif
/*
* register_cpu - Setup a sysfs device for a CPU.
* @cpu - cpu->hotpluggable field set to 1 will generate a control file in
* sysfs for this CPU.
* @num - CPU number to use when creating the device.
*
* Initialize and register the CPU device.
*/
int register_cpu(struct cpu *cpu, int num)
{
int error;
cpu->node_id = cpu_to_node(num);
memset(&cpu->dev, 0x00, sizeof(struct device));
cpu->dev.id = num;
cpu->dev.bus = &cpu_subsys;
cpu->dev.release = cpu_device_release;
cpu->dev.offline_disabled = !cpu->hotpluggable;
cpu->dev.offline = !cpu_online(num);
cpu->dev.of_node = of_get_cpu_node(num, NULL);
#ifdef CONFIG_GENERIC_CPU_AUTOPROBE
cpu->dev.bus->uevent = cpu_uevent;
#endif
cpu->dev.groups = common_cpu_attr_groups;
if (cpu->hotpluggable)
cpu->dev.groups = hotplugable_cpu_attr_groups;
error = device_register(&cpu->dev);
if (error) {
put_device(&cpu->dev);
return error;
}
per_cpu(cpu_sys_devices, num) = &cpu->dev;
register_cpu_under_node(num, cpu_to_node(num));
dev_pm_qos_expose_latency_limit(&cpu->dev,
PM_QOS_RESUME_LATENCY_NO_CONSTRAINT);
return 0;
}
struct device *get_cpu_device(unsigned cpu)
{
if (cpu < nr_cpu_ids && cpu_possible(cpu))
return per_cpu(cpu_sys_devices, cpu);
else
return NULL;
}
EXPORT_SYMBOL_GPL(get_cpu_device);
static void device_create_release(struct device *dev)
{
kfree(dev);
}
static struct device *
__cpu_device_create(struct device *parent, void *drvdata,
const struct attribute_group **groups,
const char *fmt, va_list args)
{
struct device *dev = NULL;
int retval = -ENODEV;
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev) {
retval = -ENOMEM;
goto error;
}
device_initialize(dev);
dev->parent = parent;
dev->groups = groups;
dev->release = device_create_release;
device_set_pm_not_required(dev);
dev_set_drvdata(dev, drvdata);
retval = kobject_set_name_vargs(&dev->kobj, fmt, args);
if (retval)
goto error;
retval = device_add(dev);
if (retval)
goto error;
return dev;
error:
put_device(dev);
return ERR_PTR(retval);
}
struct device *cpu_device_create(struct device *parent, void *drvdata,
const struct attribute_group **groups,
const char *fmt, ...)
{
va_list vargs;
struct device *dev;
va_start(vargs, fmt);
dev = __cpu_device_create(parent, drvdata, groups, fmt, vargs);
va_end(vargs);
return dev;
}
EXPORT_SYMBOL_GPL(cpu_device_create);
#ifdef CONFIG_GENERIC_CPU_AUTOPROBE
static DEVICE_ATTR(modalias, 0444, print_cpu_modalias, NULL);
#endif
static struct attribute *cpu_root_attrs[] = {
#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
&dev_attr_probe.attr,
&dev_attr_release.attr,
#endif
&cpu_attrs[0].attr.attr,
&cpu_attrs[1].attr.attr,
&cpu_attrs[2].attr.attr,
&cpu_attrs[3].attr.attr,
&dev_attr_kernel_max.attr,
&dev_attr_offline.attr,
&dev_attr_isolated.attr,
#ifdef CONFIG_NO_HZ_FULL
&dev_attr_nohz_full.attr,
#endif
#ifdef CONFIG_GENERIC_CPU_AUTOPROBE
&dev_attr_modalias.attr,
#endif
NULL
};
static struct attribute_group cpu_root_attr_group = {
.attrs = cpu_root_attrs,
};
static const struct attribute_group *cpu_root_attr_groups[] = {
&cpu_root_attr_group,
NULL,
};
bool cpu_is_hotpluggable(unsigned cpu)
{
struct device *dev = get_cpu_device(cpu);
return dev && container_of(dev, struct cpu, dev)->hotpluggable
&& tick_nohz_cpu_hotpluggable(cpu);
}
EXPORT_SYMBOL_GPL(cpu_is_hotpluggable);
#ifdef CONFIG_GENERIC_CPU_DEVICES
static DEFINE_PER_CPU(struct cpu, cpu_devices);
#endif
static void __init cpu_dev_register_generic(void)
{
#ifdef CONFIG_GENERIC_CPU_DEVICES
int i;
for_each_possible_cpu(i) {
if (register_cpu(&per_cpu(cpu_devices, i), i))
panic("Failed to register CPU device");
}
#endif
}
#ifdef CONFIG_GENERIC_CPU_VULNERABILITIES
ssize_t __weak cpu_show_meltdown(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(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");
}
ssize_t __weak cpu_show_spectre_v2(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(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");
}
ssize_t __weak cpu_show_l1tf(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(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");
}
ssize_t __weak cpu_show_tsx_async_abort(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "Not affected\n");
}
ssize_t __weak cpu_show_itlb_multihit(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(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");
}
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");
}
static DEVICE_ATTR(meltdown, 0444, cpu_show_meltdown, NULL);
static DEVICE_ATTR(spectre_v1, 0444, cpu_show_spectre_v1, NULL);
static DEVICE_ATTR(spectre_v2, 0444, cpu_show_spectre_v2, NULL);
static DEVICE_ATTR(spec_store_bypass, 0444, cpu_show_spec_store_bypass, NULL);
static DEVICE_ATTR(l1tf, 0444, cpu_show_l1tf, NULL);
static DEVICE_ATTR(mds, 0444, cpu_show_mds, NULL);
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 struct attribute *cpu_root_vulnerabilities_attrs[] = {
&dev_attr_meltdown.attr,
&dev_attr_spectre_v1.attr,
&dev_attr_spectre_v2.attr,
&dev_attr_spec_store_bypass.attr,
&dev_attr_l1tf.attr,
&dev_attr_mds.attr,
&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,
NULL
};
static const struct attribute_group cpu_root_vulnerabilities_group = {
.name = "vulnerabilities",
.attrs = cpu_root_vulnerabilities_attrs,
};
static void __init cpu_register_vulnerabilities(void)
{
if (sysfs_create_group(&cpu_subsys.dev_root->kobj,
&cpu_root_vulnerabilities_group))
pr_err("Unable to register CPU vulnerabilities\n");
}
#else
static inline void cpu_register_vulnerabilities(void) { }
#endif
void __init cpu_dev_init(void)
{
if (subsys_system_register(&cpu_subsys, cpu_root_attr_groups))
panic("Failed to register CPU subsystem");
cpu_dev_register_generic();
cpu_register_vulnerabilities();
}