summaryrefslogtreecommitdiffstats
path: root/arch/x86
Commit message (Collapse)AuthorAgeFilesLines
* mm: describe mmap_sem rules for __lock_page_or_retry() and callersPaul Cassella2014-08-061-1/+2
| | | | | | | | | | | | | | | | Add a comment describing the circumstances in which __lock_page_or_retry() will or will not release the mmap_sem when returning 0. Add comments to lock_page_or_retry()'s callers (filemap_fault(), do_swap_page()) noting the impact on VM_FAULT_RETRY returns. Add comments on up the call tree, particularly replacing the false "We return with mmap_sem still held" comments. Signed-off-by: Paul Cassella <cassella@cray.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-nextLinus Torvalds2014-08-061-8/+8
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull networking updates from David Miller: "Highlights: 1) Steady transitioning of the BPF instructure to a generic spot so all kernel subsystems can make use of it, from Alexei Starovoitov. 2) SFC driver supports busy polling, from Alexandre Rames. 3) Take advantage of hash table in UDP multicast delivery, from David Held. 4) Lighten locking, in particular by getting rid of the LRU lists, in inet frag handling. From Florian Westphal. 5) Add support for various RFC6458 control messages in SCTP, from Geir Ola Vaagland. 6) Allow to filter bridge forwarding database dumps by device, from Jamal Hadi Salim. 7) virtio-net also now supports busy polling, from Jason Wang. 8) Some low level optimization tweaks in pktgen from Jesper Dangaard Brouer. 9) Add support for ipv6 address generation modes, so that userland can have some input into the process. From Jiri Pirko. 10) Consolidate common TCP connection request code in ipv4 and ipv6, from Octavian Purdila. 11) New ARP packet logger in netfilter, from Pablo Neira Ayuso. 12) Generic resizable RCU hash table, with intial users in netlink and nftables. From Thomas Graf. 13) Maintain a name assignment type so that userspace can see where a network device name came from (enumerated by kernel, assigned explicitly by userspace, etc.) From Tom Gundersen. 14) Automatic flow label generation on transmit in ipv6, from Tom Herbert. 15) New packet timestamping facilities from Willem de Bruijn, meant to assist in measuring latencies going into/out-of the packet scheduler, latency from TCP data transmission to ACK, etc" * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1536 commits) cxgb4 : Disable recursive mailbox commands when enabling vi net: reduce USB network driver config options. tg3: Modify tg3_tso_bug() to handle multiple TX rings amd-xgbe: Perform phy connect/disconnect at dev open/stop amd-xgbe: Use dma_set_mask_and_coherent to set DMA mask net: sun4i-emac: fix memory leak on bad packet sctp: fix possible seqlock seadlock in sctp_packet_transmit() Revert "net: phy: Set the driver when registering an MDIO bus device" cxgb4vf: Turn off SGE RX/TX Callback Timers and interrupts in PCI shutdown routine team: Simplify return path of team_newlink bridge: Update outdated comment on promiscuous mode net-timestamp: ACK timestamp for bytestreams net-timestamp: TCP timestamping net-timestamp: SCHED timestamp on entering packet scheduler net-timestamp: add key to disambiguate concurrent datagrams net-timestamp: move timestamp flags out of sk_flags net-timestamp: extend SCM_TIMESTAMPING ancillary data struct cxgb4i : Move stray CPL definitions to cxgb4 driver tcp: reduce spurious retransmits due to transient SACK reneging qlcnic: Initialize dcbnl_ops before register_netdev ...
| * net: filter: split 'struct sk_filter' into socket and bpf partsAlexei Starovoitov2014-08-021-6/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | clean up names related to socket filtering and bpf in the following way: - everything that deals with sockets keeps 'sk_*' prefix - everything that is pure BPF is changed to 'bpf_*' prefix split 'struct sk_filter' into struct sk_filter { atomic_t refcnt; struct rcu_head rcu; struct bpf_prog *prog; }; and struct bpf_prog { u32 jited:1, len:31; struct sock_fprog_kern *orig_prog; unsigned int (*bpf_func)(const struct sk_buff *skb, const struct bpf_insn *filter); union { struct sock_filter insns[0]; struct bpf_insn insnsi[0]; struct work_struct work; }; }; so that 'struct bpf_prog' can be used independent of sockets and cleans up 'unattached' bpf use cases split SK_RUN_FILTER macro into: SK_RUN_FILTER to be used with 'struct sk_filter *' and BPF_PROG_RUN to be used with 'struct bpf_prog *' __sk_filter_release(struct sk_filter *) gains __bpf_prog_release(struct bpf_prog *) helper function also perform related renames for the functions that work with 'struct bpf_prog *', since they're on the same lines: sk_filter_size -> bpf_prog_size sk_filter_select_runtime -> bpf_prog_select_runtime sk_filter_free -> bpf_prog_free sk_unattached_filter_create -> bpf_prog_create sk_unattached_filter_destroy -> bpf_prog_destroy sk_store_orig_filter -> bpf_prog_store_orig_filter sk_release_orig_filter -> bpf_release_orig_filter __sk_migrate_filter -> bpf_migrate_filter __sk_prepare_filter -> bpf_prepare_filter API for attaching classic BPF to a socket stays the same: sk_attach_filter(prog, struct sock *)/sk_detach_filter(struct sock *) and SK_RUN_FILTER(struct sk_filter *, ctx) to execute a program which is used by sockets, tun, af_packet API for 'unattached' BPF programs becomes: bpf_prog_create(struct bpf_prog **)/bpf_prog_destroy(struct bpf_prog *) and BPF_PROG_RUN(struct bpf_prog *, ctx) to execute a program which is used by isdn, ppp, team, seccomp, ptp, xt_bpf, cls_bpf, test_bpf Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * net: filter: rename sk_convert_filter() -> bpf_convert_filter()Alexei Starovoitov2014-08-021-1/+1
| | | | | | | | | | | | | | | | to indicate that this function is converting classic BPF into eBPF and not related to sockets Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2014-07-3011-89/+216
| |\ | | | | | | | | | Signed-off-by: David S. Miller <davem@davemloft.net>
| * | net: filter: rename 'struct sock_filter_int' into 'struct bpf_insn'Alexei Starovoitov2014-07-241-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | eBPF is used by socket filtering, seccomp and soon by tracing and exposed to userspace, therefore 'sock_filter_int' name is not accurate. Rename it to 'bpf_insn' Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | | Merge tag 'random_for_linus' of ↵Linus Torvalds2014-08-062-0/+2
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random Pull randomness updates from Ted Ts'o: "Cleanups and bug fixes to /dev/random, add a new getrandom(2) system call, which is a superset of OpenBSD's getentropy(2) call, for use with userspace crypto libraries such as LibreSSL. Also add the ability to have a kernel thread to pull entropy from hardware rng devices into /dev/random" * tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random: hwrng: Pass entropy to add_hwgenerator_randomness() in bits, not bytes random: limit the contribution of the hw rng to at most half random: introduce getrandom(2) system call hw_random: fix sparse warning (NULL vs 0 for pointer) random: use registers from interrupted code for CPU's w/o a cycle counter hwrng: add per-device entropy derating hwrng: create filler thread random: add_hwgenerator_randomness() for feeding entropy from devices random: use an improved fast_mix() function random: clean up interrupt entropy accounting for archs w/o cycle counters random: only update the last_pulled time if we actually transferred entropy random: remove unneeded hash of a portion of the entropy pool random: always update the entropy pool under the spinlock
| * | | random: introduce getrandom(2) system callTheodore Ts'o2014-08-052-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The getrandom(2) system call was requested by the LibreSSL Portable developers. It is analoguous to the getentropy(2) system call in OpenBSD. The rationale of this system call is to provide resiliance against file descriptor exhaustion attacks, where the attacker consumes all available file descriptors, forcing the use of the fallback code where /dev/[u]random is not available. Since the fallback code is often not well-tested, it is better to eliminate this potential failure mode entirely. The other feature provided by this new system call is the ability to request randomness from the /dev/urandom entropy pool, but to block until at least 128 bits of entropy has been accumulated in the /dev/urandom entropy pool. Historically, the emphasis in the /dev/urandom development has been to ensure that urandom pool is initialized as quickly as possible after system boot, and preferably before the init scripts start execution. This is because changing /dev/urandom reads to block represents an interface change that could potentially break userspace which is not acceptable. In practice, on most x86 desktop and server systems, in general the entropy pool can be initialized before it is needed (and in modern kernels, we will printk a warning message if not). However, on an embedded system, this may not be the case. And so with this new interface, we can provide the functionality of blocking until the urandom pool has been initialized. Any userspace program which uses this new functionality must take care to assure that if it is used during the boot process, that it will not cause the init scripts or other portions of the system startup to hang indefinitely. SYNOPSIS #include <linux/random.h> int getrandom(void *buf, size_t buflen, unsigned int flags); DESCRIPTION The system call getrandom() fills the buffer pointed to by buf with up to buflen random bytes which can be used to seed user space random number generators (i.e., DRBG's) or for other cryptographic uses. It should not be used for Monte Carlo simulations or other programs/algorithms which are doing probabilistic sampling. If the GRND_RANDOM flags bit is set, then draw from the /dev/random pool instead of the /dev/urandom pool. The /dev/random pool is limited based on the entropy that can be obtained from environmental noise, so if there is insufficient entropy, the requested number of bytes may not be returned. If there is no entropy available at all, getrandom(2) will either block, or return an error with errno set to EAGAIN if the GRND_NONBLOCK bit is set in flags. If the GRND_RANDOM bit is not set, then the /dev/urandom pool will be used. Unlike using read(2) to fetch data from /dev/urandom, if the urandom pool has not been sufficiently initialized, getrandom(2) will block (or return -1 with the errno set to EAGAIN if the GRND_NONBLOCK bit is set in flags). The getentropy(2) system call in OpenBSD can be emulated using the following function: int getentropy(void *buf, size_t buflen) { int ret; if (buflen > 256) goto failure; ret = getrandom(buf, buflen, 0); if (ret < 0) return ret; if (ret == buflen) return 0; failure: errno = EIO; return -1; } RETURN VALUE On success, the number of bytes that was filled in the buf is returned. This may not be all the bytes requested by the caller via buflen if insufficient entropy was present in the /dev/random pool, or if the system call was interrupted by a signal. On error, -1 is returned, and errno is set appropriately. ERRORS EINVAL An invalid flag was passed to getrandom(2) EFAULT buf is outside the accessible address space. EAGAIN The requested entropy was not available, and getentropy(2) would have blocked if the GRND_NONBLOCK flag was not set. EINTR While blocked waiting for entropy, the call was interrupted by a signal handler; see the description of how interrupted read(2) calls on "slow" devices are handled with and without the SA_RESTART flag in the signal(7) man page. NOTES For small requests (buflen <= 256) getrandom(2) will not return EINTR when reading from the urandom pool once the entropy pool has been initialized, and it will return all of the bytes that have been requested. This is the recommended way to use getrandom(2), and is designed for compatibility with OpenBSD's getentropy() system call. However, if you are using GRND_RANDOM, then getrandom(2) may block until the entropy accounting determines that sufficient environmental noise has been gathered such that getrandom(2) will be operating as a NRBG instead of a DRBG for those people who are working in the NIST SP 800-90 regime. Since it may block for a long time, these guarantees do *not* apply. The user may want to interrupt a hanging process using a signal, so blocking until all of the requested bytes are returned would be unfriendly. For this reason, the user of getrandom(2) MUST always check the return value, in case it returns some error, or if fewer bytes than requested was returned. In the case of !GRND_RANDOM and small request, the latter should never happen, but the careful userspace code (and all crypto code should be careful) should check for this anyway! Finally, unless you are doing long-term key generation (and perhaps not even then), you probably shouldn't be using GRND_RANDOM. The cryptographic algorithms used for /dev/urandom are quite conservative, and so should be sufficient for all purposes. The disadvantage of GRND_RANDOM is that it can block, and the increased complexity required to deal with partially fulfilled getrandom(2) requests. Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Zach Brown <zab@zabbo.net>
* | | | Merge branch 'next' of ↵Linus Torvalds2014-08-062-0/+2
|\ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security Pull security subsystem updates from James Morris: "In this release: - PKCS#7 parser for the key management subsystem from David Howells - appoint Kees Cook as seccomp maintainer - bugfixes and general maintenance across the subsystem" * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (94 commits) X.509: Need to export x509_request_asymmetric_key() netlabel: shorter names for the NetLabel catmap funcs/structs netlabel: fix the catmap walking functions netlabel: fix the horribly broken catmap functions netlabel: fix a problem when setting bits below the previously lowest bit PKCS#7: X.509 certificate issuer and subject are mandatory fields in the ASN.1 tpm: simplify code by using %*phN specifier tpm: Provide a generic means to override the chip returned timeouts tpm: missing tpm_chip_put in tpm_get_random() tpm: Properly clean sysfs entries in error path tpm: Add missing tpm_do_selftest to ST33 I2C driver PKCS#7: Use x509_request_asymmetric_key() Revert "selinux: fix the default socket labeling in sock_graft()" X.509: x509_request_asymmetric_keys() doesn't need string length arguments PKCS#7: fix sparse non static symbol warning KEYS: revert encrypted key change ima: add support for measuring and appraising firmware firmware_class: perform new LSM checks security: introduce kernel_fw_from_file hook PKCS#7: Missing inclusion of linux/err.h ...
| * | | | seccomp: add "seccomp" syscallKees Cook2014-07-182-0/+2
| |/ / / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This adds the new "seccomp" syscall with both an "operation" and "flags" parameter for future expansion. The third argument is a pointer value, used with the SECCOMP_SET_MODE_FILTER operation. Currently, flags must be 0. This is functionally equivalent to prctl(PR_SET_SECCOMP, ...). In addition to the TSYNC flag later in this patch series, there is a non-zero chance that this syscall could be used for configuring a fixed argument area for seccomp-tracer-aware processes to pass syscall arguments in the future. Hence, the use of "seccomp" not simply "seccomp_add_filter" for this syscall. Additionally, this syscall uses operation, flags, and user pointer for arguments because strictly passing arguments via a user pointer would mean seccomp itself would be unable to trivially filter the seccomp syscall itself. Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Reviewed-by: Andy Lutomirski <luto@amacapital.net>
* | | | Merge branch 'timers-core-for-linus' of ↵Linus Torvalds2014-08-054-65/+43
|\ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull timer and time updates from Thomas Gleixner: "A rather large update of timers, timekeeping & co - Core timekeeping code is year-2038 safe now for 32bit machines. Now we just need to fix all in kernel users and the gazillion of user space interfaces which rely on timespec/timeval :) - Better cache layout for the timekeeping internal data structures. - Proper nanosecond based interfaces for in kernel users. - Tree wide cleanup of code which wants nanoseconds but does hoops and loops to convert back and forth from timespecs. Some of it definitely belongs into the ugly code museum. - Consolidation of the timekeeping interface zoo. - A fast NMI safe accessor to clock monotonic for tracing. This is a long standing request to support correlated user/kernel space traces. With proper NTP frequency correction it's also suitable for correlation of traces accross separate machines. - Checkpoint/restart support for timerfd. - A few NOHZ[_FULL] improvements in the [hr]timer code. - Code move from kernel to kernel/time of all time* related code. - New clocksource/event drivers from the ARM universe. I'm really impressed that despite an architected timer in the newer chips SoC manufacturers insist on inventing new and differently broken SoC specific timers. [ Ed. "Impressed"? I don't think that word means what you think it means ] - Another round of code move from arch to drivers. Looks like most of the legacy mess in ARM regarding timers is sorted out except for a few obnoxious strongholds. - The usual updates and fixlets all over the place" * 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (114 commits) timekeeping: Fixup typo in update_vsyscall_old definition clocksource: document some basic timekeeping concepts timekeeping: Use cached ntp_tick_length when accumulating error timekeeping: Rework frequency adjustments to work better w/ nohz timekeeping: Minor fixup for timespec64->timespec assignment ftrace: Provide trace clocks monotonic timekeeping: Provide fast and NMI safe access to CLOCK_MONOTONIC seqcount: Add raw_write_seqcount_latch() seqcount: Provide raw_read_seqcount() timekeeping: Use tk_read_base as argument for timekeeping_get_ns() timekeeping: Create struct tk_read_base and use it in struct timekeeper timekeeping: Restructure the timekeeper some more clocksource: Get rid of cycle_last clocksource: Move cycle_last validation to core code clocksource: Make delta calculation a function wireless: ath9k: Get rid of timespec conversions drm: vmwgfx: Use nsec based interfaces drm: i915: Use nsec based interfaces timekeeping: Provide ktime_get_raw() hangcheck-timer: Use ktime_get_ns() ...
| * | | | timekeeping: Create struct tk_read_base and use it in struct timekeeperThomas Gleixner2014-07-232-18/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The members of the new struct are the required ones for the new NMI safe accessor to clcok monotonic. In order to reuse the existing timekeeping code and to make the update of the fast NMI safe timekeepers a simple memcpy use the struct for the timekeeper as well and convert all users. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * | | | clocksource: Get rid of cycle_lastThomas Gleixner2014-07-232-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | cycle_last was added to the clocksource to support the TSC validation. We moved that to the core code, so we can get rid of the extra copy. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * | | | clocksource: Move cycle_last validation to core codeThomas Gleixner2014-07-232-12/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The only user of the cycle_last validation is the x86 TSC. In order to provide NMI safe accessor functions for clock monotonic and monotonic_raw we need to do that in the core. We can't do the TSC specific if (now < cycle_last) now = cycle_last; for the other wrapping around clocksources, but TSC has CLOCKSOURCE_MASK(64) which actually does not mask out anything so if now is less than cycle_last the subtraction will give a negative result. So we can check for that in clocksource_delta() and return 0 for that case. Implement and enable it for x86 Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * | | | x86: kvm: Make kvm_get_time_and_clockread() nanoseconds basedThomas Gleixner2014-07-231-30/+14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Convert the relevant base data right away to nanoseconds instead of doing the conversion on every readout. Reduces text size by 160 bytes. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Gleb Natapov <gleb@kernel.org> Cc: kvm@vger.kernel.org Acked-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * | | | x86: kvm: Use ktime_get_boot_ns()Thomas Gleixner2014-07-231-5/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use the new nanoseconds based interface and get rid of the timespec conversion dance. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Gleb Natapov <gleb@kernel.org> Cc: kvm@vger.kernel.org Acked-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * | | | ktime: Kill non-scalar ktime_t implementation for 2038John Stultz2014-07-231-1/+0
| |/ / / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The non-scalar ktime_t implementation is basically a timespec which has to be changed to support dates past 2038 on 32bit systems. This patch removes the non-scalar ktime_t implementation, forcing the scalar s64 nanosecond version on all architectures. This may have additional performance overhead on some 32bit systems when converting between ktime_t and timespec structures, however the majority of 32bit systems (arm and i386) were already using scalar ktime_t, so no performance regressions will be seen on those platforms. On affected platforms, I'm open to finding optimizations, including avoiding converting to timespecs where possible. [ tglx: We can now cleanup the ktime_t.tv64 mess, but thats a different issue and we can throw a coccinelle script at it ] Signed-off-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
* | | | x86: MCE: Add raw_lock conversion againThomas Gleixner2014-08-051-9/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit ea431643d6c3 ("x86/mce: Fix CMCI preemption bugs") breaks RT by the completely unrelated conversion of the cmci_discover_lock to a regular (non raw) spinlock. This lock was annotated in commit 59d958d2c7de ("locking, x86: mce: Annotate cmci_discover_lock as raw") with a proper explanation why. The argument for converting the lock back to a regular spinlock was: - it does percpu ops without disabling preemption. Preemption is not disabled due to the mistaken use of a raw spinlock. Which is complete nonsense. The raw_spinlock is disabling preemption in the same way as a regular spinlock. In mainline spinlock maps to raw_spinlock, in RT spinlock becomes a "sleeping" lock. raw_spinlock has on RT exactly the same semantics as in mainline. And because this lock is taken in non preemptible context it must be raw on RT. Undo the locking brainfart. Reported-by: Clark Williams <williams@redhat.com> Reported-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: stable@vger.kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | | Merge branch 'x86-vdso-for-linus' of ↵Linus Torvalds2014-08-048-291/+193
|\ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 vdso updates from Ingo Molnar: "Further simplifications and improvements to the VDSO code, by Andy Lutomirski" * 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86_64/vsyscall: Fix warn_bad_vsyscall log output x86/vdso: Set VM_MAYREAD for the vvar vma x86, vdso: Get rid of the fake section mechanism x86, vdso: Move the vvar area before the vdso text
| * | | | x86_64/vsyscall: Fix warn_bad_vsyscall log outputAndy Lutomirski2014-07-251-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This commit in Linux 3.6: commit c767a54ba0657e52e6edaa97cbe0b0a8bf1c1655 Author: Joe Perches <joe@perches.com> Date: Mon May 21 19:50:07 2012 -0700 x86/debug: Add KERN_<LEVEL> to bare printks, convert printks to pr_<level> caused warn_bad_vsyscall to output garbage in the middle of the line. Revert the bad part of it. The printk in question isn't actually bare; the level is "%s". The bug this fixes is purely cosmetic; backports are optional. Cc: <stable@vger.kernel.org> # v3.6+ Signed-off-by: Andy Lutomirski <luto@amacapital.net> Link: http://lkml.kernel.org/r/03eac1f24110bbe496ecc12a4df467e0d88466d4.1406330947.git.luto@amacapital.net Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| * | | | x86/vdso: Set VM_MAYREAD for the vvar vmaAndy Lutomirski2014-07-251-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The VVAR area can, obviously, be read; that is kind of the point. AFAIK this has no effect whatsoever unless x86 suddenly turns into a nommu architecture. Nonetheless, not setting it is suspicious. Reported-by: Nathan Lynch <Nathan_Lynch@mentor.com> Signed-off-by: Andy Lutomirski <luto@amacapital.net> Link: http://lkml.kernel.org/r/e4c8bf4bc2725bda22c4a4b7d0c82adcd8f8d9b8.1406330779.git.luto@amacapital.net Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| * | | | x86, vdso: Get rid of the fake section mechanismAndy Lutomirski2014-07-114-229/+126
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Now that we can tolerate extra things dangling off the end of the vdso image, we can strip the vdso the old fashioned way rather than using an overcomplicated custom stripping algorithm. This is a partial reversion of: 6f121e5 x86, vdso: Reimplement vdso.so preparation in build-time C Signed-off-by: Andy Lutomirski <luto@amacapital.net> Link: http://lkml.kernel.org/r/50e01ed6dcc0575d20afd782f9fe98d5ee3e2d8a.1405040914.git.luto@amacapital.net Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| * | | | x86, vdso: Move the vvar area before the vdso textAndy Lutomirski2014-07-115-57/+62
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Putting the vvar area after the vdso text is rather complicated: it only works of the total length of the vdso text mapping is known at vdso link time, and the linker doesn't allow symbol addresses to depend on the sizes of non-allocatable data after the PT_LOAD segment. Moving the vvar area before the vdso text will allow is to safely map non-allocatable data after the vdso text, which is a nice simplification. Signed-off-by: Andy Lutomirski <luto@amacapital.net> Link: http://lkml.kernel.org/r/156c78c0d93144ff1055a66493783b9e56813983.1405040914.git.luto@amacapital.net Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
* | | | | Merge branch 'x86-uv-for-linus' of ↵Linus Torvalds2014-08-042-39/+49
|\ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 UV TLB update from Ingo Molnar: "UV TLB shootdown logic updates for version of the UV architecture" * 'x86-uv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/uv: Update the UV3 TLB shootdown logic
| * | | | | x86/uv: Update the UV3 TLB shootdown logicCliff Wickman2014-06-052-39/+49
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Update of TLB shootdown code for UV3. Kernel function native_flush_tlb_others() calls uv_flush_tlb_others() on UV to invalidate tlb page definitions on remote cpus. The UV systems have a hardware 'broadcast assist unit' which can be used to broadcast shootdown messages to all cpu's of selected nodes. The behavior of the BAU has changed only slightly with UV3: - UV3 is recognized with is_uv3_hub(). - UV2 functions and structures (uv2_xxx) are in most cases simply renamed to uv2_3_xxx. - Some UV2 error workarounds are not needed for UV3. (see uv_bau_message_interrupt and enable_timeouts) Signed-off-by: Cliff Wickman <cpw@sgi.com> Link: http://lkml.kernel.org/r/E1WkgWh-0001yJ-3K@eag09.americas.sgi.com [ Removed a few linebreak uglies. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
* | | | | | Merge branch 'x86-ras-for-linus' of ↵Linus Torvalds2014-08-044-5/+69
|\ \ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull RAS updates from Ingo Molnar: "The main changes in this cycle are: - RAS tracing/events infrastructure, by Gong Chen. - Various generalizations of the APEI code to make it available to non-x86 architectures, by Tomasz Nowicki" * 'x86-ras-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/ras: Fix build warnings in <linux/aer.h> acpi, apei, ghes: Factor out ioremap virtual memory for IRQ and NMI context. acpi, apei, ghes: Make NMI error notification to be GHES architecture extension. apei, mce: Factor out APEI architecture specific MCE calls. RAS, extlog: Adjust init flow trace, eMCA: Add a knob to adjust where to save event log trace, RAS: Add eMCA trace event interface RAS, debugfs: Add debugfs interface for RAS subsystem CPER: Adjust code flow of some functions x86, MCE: Robustify mcheck_init_device trace, AER: Move trace into unified interface trace, RAS: Add basic RAS trace event x86, MCE: Kill CPU_POST_DEAD
| * \ \ \ \ \ Merge tag 'please-pull-apei' into x86/rasH. Peter Anvin2014-07-3028-151/+471
| |\ \ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | APEI is currently implemented so that it depends on x86 hardware. The primary dependency is that GHES uses the x86 NMI for hardware error notification and MCE for memory error handling. These patches remove that dependency. Other APEI features such as error reporting via external IRQ, error serialization, or error injection, do not require changes to use them on non-x86 architectures. The following patch set eliminates the APEI Kconfig x86 dependency by making these changes: - treat NMI notification as GHES architecture - HAVE_ACPI_APEI_NMI - group and wrap around #ifdef CONFIG_HAVE_ACPI_APEI_NMI code which is used only for NMI path - identify architectural boxes and abstract it accordingly (tlb flush and MCE) - rework ioremap for both IRQ and NMI context NMI code is kept in ghes.c file since NMI and IRQ context are tightly coupled. Note, these patches introduce no functional changes for x86. The NMI notification feature is hard selected for x86. Architectures that want to use this feature should also provide NMI code infrastructure.
| | * | | | | | acpi, apei, ghes: Factor out ioremap virtual memory for IRQ and NMI context.Tomasz Nowicki2014-07-221-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | GHES currently maps two pages with atomic_ioremap. From now on, NMI is architectural depended so there is no need to allocate an NMI page for platforms without NMI support. To make it possible to not use a second page, swap the existing page order so that the IRQ context page is first, and the optional NMI context page is second. Then, use HAVE_ACPI_APEI_NMI to decide how many pages are to be allocated. Signed-off-by: Tomasz Nowicki <tomasz.nowicki@linaro.org> Acked-by: Borislav Petkov <bp@suse.de> Signed-off-by: Tony Luck <tony.luck@intel.com>
| | * | | | | | acpi, apei, ghes: Make NMI error notification to be GHES architecture extension.Tomasz Nowicki2014-07-221-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently APEI depends on x86 architecture. It is because of NMI hardware error notification of GHES which is currently supported by x86 only. However, many other APEI features can be still used perfectly by other architectures. This commit adds two symbols: 1. HAVE_ACPI_APEI for those archs which support APEI. 2. HAVE_ACPI_APEI_NMI which is used for NMI code isolation in ghes.c file. NMI related data and functions are grouped so they can be wrapped inside one #ifdef section. Appropriate function stubs are provided for !NMI case. Note there is no functional changes for x86 due to hard selected HAVE_ACPI_APEI and HAVE_ACPI_APEI_NMI symbols. Signed-off-by: Tomasz Nowicki <tomasz.nowicki@linaro.org> Acked-by: Borislav Petkov <bp@suse.de> Signed-off-by: Tony Luck <tony.luck@intel.com>
| | * | | | | | apei, mce: Factor out APEI architecture specific MCE calls.Tomasz Nowicki2014-07-222-0/+57
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This commit abstracts MCE calls and provides weak corresponding default implementation for those architectures which do not need arch specific actions. Each platform willing to do additional architectural actions should provides desired function definition. It allows us to avoid wrap code into #ifdef in generic code and prevent new platform from introducing dummy stub function too. Initially, there are two APEI arch-specific calls: - arch_apei_enable_cmcff() - arch_apei_report_mem_error() Both interact with MCE driver for X86 architecture. Signed-off-by: Tomasz Nowicki <tomasz.nowicki@linaro.org> Acked-by: Borislav Petkov <bp@suse.de> Signed-off-by: Tony Luck <tony.luck@intel.com>
| * | | | | | | x86, MCE: Robustify mcheck_init_deviceBorislav Petkov2014-06-241-4/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BorisO reports that misc_register() fails often on xen. The current code unregisters the CPU hotplug notifier in that case. If then a CPU is offlined and onlined back again, we end up with a second timer running on that CPU, leading to soft lockups and system hangs. So let's leave the hotcpu notifier always registered - even if mce_device_create failed for some cores and never unreg it so that we can deal with the timer handling accordingly. Reported-and-Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Link: http://lkml.kernel.org/r/1403274493-1371-1-git-send-email-boris.ostrovsky@oracle.com Signed-off-by: Borislav Petkov <bp@suse.de>
| * | | | | | | x86, MCE: Kill CPU_POST_DEADBorislav Petkov2014-06-221-5/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In conjunction with cleaning up CPU hotplug, we want to get rid of CPU_POST_DEAD. Kill this instance here and rediscover CMCI banks at the end of CPU_DEAD. Link: http://lkml.kernel.org/r/http://lkml.kernel.org/r/1400750624-19238-1-git-send-email-bp@alien8.de Signed-off-by: Borislav Petkov <bp@suse.de>
* | | | | | | | Merge branch 'x86-platform-for-linus' of ↵Linus Torvalds2014-08-045-41/+486
|\ \ \ \ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 platform updates from Ingo Molnar: "The main changes in this cycle are: - Intel SOC driver updates, by Aubrey Li. - TS5500 platform updates, by Vivien Didelot" * 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/pmc_atom: Silence shift wrapping warnings in pmc_sleep_tmr_show() x86/pmc_atom: Expose PMC device state and platform sleep state x86/pmc_atom: Eisable a few S0ix wake up events for S0ix residency x86/platform: New Intel Atom SOC power management controller driver x86/platform/ts5500: Add support for TS-5400 boards x86/platform/ts5500: Add a 'name' sysfs attribute x86/platform/ts5500: Use the DEVICE_ATTR_RO() macro
| * | | | | | | | x86/pmc_atom: Silence shift wrapping warnings in pmc_sleep_tmr_show()Dan Carpenter2014-08-021-5/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | I don't know if we really need 64 bits here but these variables are declared as u64 and it can't hurt to cast this so we prevent any shift wrapping. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Aubrey Li <aubrey.li@linux.intel.com> Link: http://lkml.kernel.org/r/20140801082715.GE28869@mwanda Signed-off-by: H. Peter Anvin <hpa@zytor.com>
| * | | | | | | | x86/pmc_atom: Expose PMC device state and platform sleep stateLi, Aubrey2014-07-252-0/+230
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add the following interfaces to exposes PMC device state and sleep state residency via debugfs: /sys/kernel/debugfs/pmc_atom/dev_state /sys/kernel/debugfs/pmc_atom/sleep_state Signed-off-by: Aubrey Li <aubrey.li@linux.intel.com> Link: http://lkml.kernel.org/r/53B0FF59.8000600@linux.intel.com Signed-off-by: Kasagar, Srinidhi <srinidhi.kasagar@intel.com> Reviewed-by: Rudramuni, Vishwesh M <vishwesh.m.rudramuni@intel.com> Reviewed-by: Joe Perches <joe@perches.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| * | | | | | | | x86/pmc_atom: Eisable a few S0ix wake up events for S0ix residencyLi, Aubrey2014-07-252-0/+63
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Disable PMC S0IX_WAKE_EN events coming from LPC block(unused) and also from GPIO_SUS ored dedicated IRQs (must be disabled as per PMC programming rule), GPIOSCORE ored dedicated IRQs (must be disabled as per PMC programming rule), GPIO_SUS shared IRQ (not necessary since the IOAPIC_DS wake event will still work), GPIO_SCORE shared IRQ (not necessary since the IOAPIC_DS wake event will still work). Signed-off-by: Aubrey Li <aubrey.li@linux.intel.com> Link: http://lkml.kernel.org/r/53B0FF22.5080403@linux.intel.com Signed-off-by: Olivier Leveque <olivier.leveque@intel.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| * | | | | | | | x86/platform: New Intel Atom SOC power management controller driverLi, Aubrey2014-07-254-0/+140
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The Power Management Controller (PMC) controls many of the power management features present in the Atom SoC. This driver provides a native power off function via PMC PCI IO port. On some ACPI hardware-reduced platforms(e.g. ASUS-T100), ACPI sleep registers are not valid so that (*pm_power_off)() is not hooked by acpi_power_off(). The power off function in this driver is installed only when pm_power_off is NULL. Signed-off-by: Aubrey Li <aubrey.li@linux.intel.com> Link: http://lkml.kernel.org/r/53B0FEEA.3010805@linux.intel.com Signed-off-by: Lejun Zhu <lejun.zhu@linux.intel.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| * | | | | | | | x86/platform/ts5500: Add support for TS-5400 boardsVivien Didelot2014-07-161-8/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch extends the TS-5500 platform driver to support the similar Technologic Systems TS-5400 Single Board Computer: http://wiki.embeddedarm.com/wiki/TS-5400 Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Savoir-faire Linux Inc. <kernel@savoirfairelinux.com> Link: http://lkml.kernel.org/r/1404860269-11837-4-git-send-email-vivien.didelot@savoirfairelinux.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * | | | | | | | x86/platform/ts5500: Add a 'name' sysfs attributeVivien Didelot2014-07-161-5/+18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a new "name" attribute to the TS5500 sysfs group, to clarify which supported board model it is. Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Savoir-faire Linux Inc. <kernel@savoirfairelinux.com> Link: http://lkml.kernel.org/r/1404860269-11837-3-git-send-email-vivien.didelot@savoirfairelinux.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * | | | | | | | x86/platform/ts5500: Use the DEVICE_ATTR_RO() macroVivien Didelot2014-07-161-28/+22
| | |_|_|_|/ / / | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use the DEVICE_ATTR_RO() helper macro to simplify the declaration of read-only sysfs attributes in the TS5500 code.. Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Savoir-faire Linux Inc. <kernel@savoirfairelinux.com> Link: http://lkml.kernel.org/r/1404860269-11837-2-git-send-email-vivien.didelot@savoirfairelinux.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
* | | | | | | | Merge branch 'x86-mm-for-linus' of ↵Linus Torvalds2014-08-048-99/+70
|\ \ \ \ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 mm changes from Ingo Molnar: "The main change in this cycle is the rework of the TLB range flushing code, to simplify, fix and consolidate the code. By Dave Hansen" * 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/mm: Set TLB flush tunable to sane value (33) x86/mm: New tunable for single vs full TLB flush x86/mm: Add tracepoints for TLB flushes x86/mm: Unify remote INVLPG code x86/mm: Fix missed global TLB flush stat x86/mm: Rip out complicated, out-of-date, buggy TLB flushing x86/mm: Clean up the TLB flushing code x86/smep: Be more informative when signalling an SMEP fault
| * | | | | | | | x86/mm: Set TLB flush tunable to sane value (33)Dave Hansen2014-07-311-2/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This has been run through Intel's LKP tests across a wide range of modern sytems and workloads and it wasn't shown to make a measurable performance difference positive or negative. Now that we have some shiny new tracepoints, we can actually figure out what the heck is going on. During a kernel compile, 60% of the flush_tlb_mm_range() calls are for a single page. It breaks down like this: size percent percent<= V V V GLOBAL: 2.20% 2.20% avg cycles: 2283 1: 56.92% 59.12% avg cycles: 1276 2: 13.78% 72.90% avg cycles: 1505 3: 8.26% 81.16% avg cycles: 1880 4: 7.41% 88.58% avg cycles: 2447 5: 1.73% 90.31% avg cycles: 2358 6: 1.32% 91.63% avg cycles: 2563 7: 1.14% 92.77% avg cycles: 2862 8: 0.62% 93.39% avg cycles: 3542 9: 0.08% 93.47% avg cycles: 3289 10: 0.43% 93.90% avg cycles: 3570 11: 0.20% 94.10% avg cycles: 3767 12: 0.08% 94.18% avg cycles: 3996 13: 0.03% 94.20% avg cycles: 4077 14: 0.02% 94.23% avg cycles: 4836 15: 0.04% 94.26% avg cycles: 5699 16: 0.06% 94.32% avg cycles: 5041 17: 0.57% 94.89% avg cycles: 5473 18: 0.02% 94.91% avg cycles: 5396 19: 0.03% 94.95% avg cycles: 5296 20: 0.02% 94.96% avg cycles: 6749 21: 0.18% 95.14% avg cycles: 6225 22: 0.01% 95.15% avg cycles: 6393 23: 0.01% 95.16% avg cycles: 6861 24: 0.12% 95.28% avg cycles: 6912 25: 0.05% 95.32% avg cycles: 7190 26: 0.01% 95.33% avg cycles: 7793 27: 0.01% 95.34% avg cycles: 7833 28: 0.01% 95.35% avg cycles: 8253 29: 0.08% 95.42% avg cycles: 8024 30: 0.03% 95.45% avg cycles: 9670 31: 0.01% 95.46% avg cycles: 8949 32: 0.01% 95.46% avg cycles: 9350 33: 3.11% 98.57% avg cycles: 8534 34: 0.02% 98.60% avg cycles: 10977 35: 0.02% 98.62% avg cycles: 11400 We get in to dimishing returns pretty quickly. On pre-IvyBridge CPUs, we used to set the limit at 8 pages, and it was set at 128 on IvyBrige. That 128 number looks pretty silly considering that less than 0.5% of the flushes are that large. The previous code tried to size this number based on the size of the TLB. Good idea, but it's error-prone, needs maintenance (which it didn't get up to now), and probably would not matter in practice much. Settting it to 33 means that we cover the mallopt M_TRIM_THRESHOLD, which is the most universally common size to do flushes. That's the short version. Here's the long one for why I chose 33: 1. These numbers have a constant bias in the timestamps from the tracing. Probably counts for a couple hundred cycles in each of these tests, but it should be fairly _even_ across all of them. The smallest delta between the tracepoints I have ever seen is 335 cycles. This is one reason the cycles/page cost goes down in general as the flushes get larger. The true cost is nearer to 100 cycles. 2. A full flush is more expensive than a single invlpg, but not by much (single percentages). 3. A dtlb miss is 17.1ns (~45 cycles) and a itlb miss is 13.0ns (~34 cycles). At those rates, refilling the 512-entry dTLB takes 22,000 cycles. 4. 22,000 cycles is approximately the equivalent of doing 85 invlpg operations. But, the odds are that the TLB can actually be filled up faster than that because TLB misses that are close in time also tend to leverage the same caches. 6. ~98% of flushes are <=33 pages. There are a lot of flushes of 33 pages, probably because libc's M_TRIM_THRESHOLD is set to 128k (32 pages) 7. I've found no consistent data to support changing the IvyBridge vs. SandyBridge tunable by a factor of 16 I used the performance counters on this hardware (IvyBridge i5-3320M) to figure out the tlb miss costs: ocperf.py stat -e dtlb_load_misses.walk_duration,dtlb_load_misses.walk_completed,dtlb_store_misses.walk_duration,dtlb_store_misses.walk_completed,itlb_misses.walk_duration,itlb_misses.walk_completed,itlb.itlb_flush 7,720,030,970 dtlb_load_misses_walk_duration [57.13%] 169,856,353 dtlb_load_misses_walk_completed [57.15%] 708,832,859 dtlb_store_misses_walk_duration [57.17%] 19,346,823 dtlb_store_misses_walk_completed [57.17%] 2,779,687,402 itlb_misses_walk_duration [57.15%] 82,241,148 itlb_misses_walk_completed [57.13%] 770,717 itlb_itlb_flush [57.11%] Show that a dtlb miss is 17.1ns (~45 cycles) and a itlb miss is 13.0ns (~34 cycles). At those rates, refilling the 512-entry dTLB takes 22,000 cycles. On a SandyBridge system with more cores and larger caches, those are dtlb=13.4ns and itlb=9.5ns. cat perf.stat.txt | perl -pe 's/,//g' | awk '/itlb_misses_walk_duration/ { icyc+=$1 } /itlb_misses_walk_completed/ { imiss+=$1 } /dtlb_.*_walk_duration/ { dcyc+=$1 } /dtlb_.*.*completed/ { dmiss+=$1 } END {print "itlb cyc/miss: ", icyc/imiss, " dtlb cyc/miss: ", dcyc/dmiss, " ----- ", icyc,imiss, dcyc,dmiss } On Westmere CPUs, the counters to use are: itlb_flush,itlb_misses.walk_cycles,itlb_misses.any,dtlb_misses.walk_cycles,dtlb_misses.any The assumptions that this code went in under: https://lkml.org/lkml/2012/6/12/119 say that a flush and a refill are about 100ns. Being generous, that is over by a factor of 6 on the refill side, although it is fairly close on the cost of an invlpg. An increase of a single invlpg operation seems to lengthen the flush range operation by about 200 cycles. Here is one example of the data collected for flushing 10 and 11 pages (full data are below): 10: 0.43% 93.90% avg cycles: 3570 cycles/page: 357 samples: 4714 11: 0.20% 94.10% avg cycles: 3767 cycles/page: 342 samples: 2145 How to generate this table: echo 10000 > /sys/kernel/debug/tracing/buffer_size_kb echo x86-tsc > /sys/kernel/debug/tracing/trace_clock echo 'reason != 0' > /sys/kernel/debug/tracing/events/tlb/tlb_flush/filter echo 1 > /sys/kernel/debug/tracing/events/tlb/tlb_flush/enable Pipe the trace output in to this script: http://sr71.net/~dave/intel/201402-tlb/trace-time-diff-process.pl.txt Note that these data were gathered with the invlpg threshold set to 150 pages. Only data points with >=50 of samples were printed: Flush % of %<= in flush this pages es size ------------------------------------------------------------------------------ -1: 2.20% 2.20% avg cycles: 2283 cycles/page: xxxx samples: 23960 1: 56.92% 59.12% avg cycles: 1276 cycles/page: 1276 samples: 620895 2: 13.78% 72.90% avg cycles: 1505 cycles/page: 752 samples: 150335 3: 8.26% 81.16% avg cycles: 1880 cycles/page: 626 samples: 90131 4: 7.41% 88.58% avg cycles: 2447 cycles/page: 611 samples: 80877 5: 1.73% 90.31% avg cycles: 2358 cycles/page: 471 samples: 18885 6: 1.32% 91.63% avg cycles: 2563 cycles/page: 427 samples: 14397 7: 1.14% 92.77% avg cycles: 2862 cycles/page: 408 samples: 12441 8: 0.62% 93.39% avg cycles: 3542 cycles/page: 442 samples: 6721 9: 0.08% 93.47% avg cycles: 3289 cycles/page: 365 samples: 917 10: 0.43% 93.90% avg cycles: 3570 cycles/page: 357 samples: 4714 11: 0.20% 94.10% avg cycles: 3767 cycles/page: 342 samples: 2145 12: 0.08% 94.18% avg cycles: 3996 cycles/page: 333 samples: 864 13: 0.03% 94.20% avg cycles: 4077 cycles/page: 313 samples: 289 14: 0.02% 94.23% avg cycles: 4836 cycles/page: 345 samples: 236 15: 0.04% 94.26% avg cycles: 5699 cycles/page: 379 samples: 390 16: 0.06% 94.32% avg cycles: 5041 cycles/page: 315 samples: 643 17: 0.57% 94.89% avg cycles: 5473 cycles/page: 321 samples: 6229 18: 0.02% 94.91% avg cycles: 5396 cycles/page: 299 samples: 224 19: 0.03% 94.95% avg cycles: 5296 cycles/page: 278 samples: 367 20: 0.02% 94.96% avg cycles: 6749 cycles/page: 337 samples: 185 21: 0.18% 95.14% avg cycles: 6225 cycles/page: 296 samples: 1964 22: 0.01% 95.15% avg cycles: 6393 cycles/page: 290 samples: 83 23: 0.01% 95.16% avg cycles: 6861 cycles/page: 298 samples: 61 24: 0.12% 95.28% avg cycles: 6912 cycles/page: 288 samples: 1307 25: 0.05% 95.32% avg cycles: 7190 cycles/page: 287 samples: 533 26: 0.01% 95.33% avg cycles: 7793 cycles/page: 299 samples: 94 27: 0.01% 95.34% avg cycles: 7833 cycles/page: 290 samples: 66 28: 0.01% 95.35% avg cycles: 8253 cycles/page: 294 samples: 73 29: 0.08% 95.42% avg cycles: 8024 cycles/page: 276 samples: 846 30: 0.03% 95.45% avg cycles: 9670 cycles/page: 322 samples: 296 31: 0.01% 95.46% avg cycles: 8949 cycles/page: 288 samples: 79 32: 0.01% 95.46% avg cycles: 9350 cycles/page: 292 samples: 60 33: 3.11% 98.57% avg cycles: 8534 cycles/page: 258 samples: 33936 34: 0.02% 98.60% avg cycles: 10977 cycles/page: 322 samples: 268 35: 0.02% 98.62% avg cycles: 11400 cycles/page: 325 samples: 177 36: 0.01% 98.63% avg cycles: 11504 cycles/page: 319 samples: 161 37: 0.02% 98.65% avg cycles: 11596 cycles/page: 313 samples: 182 38: 0.02% 98.66% avg cycles: 11850 cycles/page: 311 samples: 195 39: 0.01% 98.68% avg cycles: 12158 cycles/page: 311 samples: 128 40: 0.01% 98.68% avg cycles: 11626 cycles/page: 290 samples: 78 41: 0.04% 98.73% avg cycles: 11435 cycles/page: 278 samples: 477 42: 0.01% 98.73% avg cycles: 12571 cycles/page: 299 samples: 74 43: 0.01% 98.74% avg cycles: 12562 cycles/page: 292 samples: 78 44: 0.01% 98.75% avg cycles: 12991 cycles/page: 295 samples: 108 45: 0.01% 98.76% avg cycles: 13169 cycles/page: 292 samples: 78 46: 0.02% 98.78% avg cycles: 12891 cycles/page: 280 samples: 261 47: 0.01% 98.79% avg cycles: 13099 cycles/page: 278 samples: 67 48: 0.01% 98.80% avg cycles: 13851 cycles/page: 288 samples: 77 49: 0.01% 98.80% avg cycles: 13749 cycles/page: 280 samples: 66 50: 0.01% 98.81% avg cycles: 13949 cycles/page: 278 samples: 73 52: 0.00% 98.82% avg cycles: 14243 cycles/page: 273 samples: 52 54: 0.01% 98.83% avg cycles: 15312 cycles/page: 283 samples: 87 55: 0.01% 98.84% avg cycles: 15197 cycles/page: 276 samples: 109 56: 0.02% 98.86% avg cycles: 15234 cycles/page: 272 samples: 208 57: 0.00% 98.86% avg cycles: 14888 cycles/page: 261 samples: 53 58: 0.01% 98.87% avg cycles: 15037 cycles/page: 259 samples: 59 59: 0.01% 98.87% avg cycles: 15752 cycles/page: 266 samples: 63 62: 0.00% 98.89% avg cycles: 16222 cycles/page: 261 samples: 54 64: 0.02% 98.91% avg cycles: 17179 cycles/page: 268 samples: 248 65: 0.12% 99.03% avg cycles: 18762 cycles/page: 288 samples: 1324 85: 0.00% 99.10% avg cycles: 21649 cycles/page: 254 samples: 50 127: 0.01% 99.18% avg cycles: 32397 cycles/page: 255 samples: 75 128: 0.13% 99.31% avg cycles: 31711 cycles/page: 247 samples: 1466 129: 0.18% 99.49% avg cycles: 33017 cycles/page: 255 samples: 1927 181: 0.33% 99.84% avg cycles: 2489 cycles/page: 13 samples: 3547 256: 0.05% 99.91% avg cycles: 2305 cycles/page: 9 samples: 550 512: 0.03% 99.95% avg cycles: 2133 cycles/page: 4 samples: 304 1512: 0.01% 99.99% avg cycles: 3038 cycles/page: 2 samples: 65 Here are the tlb counters during a 10-second slice of a kernel compile for a SandyBridge system. It's better than IvyBridge, but probably due to the larger caches since this was one of the 'X' extreme parts. 10,873,007,282 dtlb_load_misses_walk_duration 250,711,333 dtlb_load_misses_walk_completed 1,212,395,865 dtlb_store_misses_walk_duration 31,615,772 dtlb_store_misses_walk_completed 5,091,010,274 itlb_misses_walk_duration 163,193,511 itlb_misses_walk_completed 1,321,980 itlb_itlb_flush 10.008045158 seconds time elapsed # cat perf.stat.1392743721.txt | perl -pe 's/,//g' | awk '/itlb_misses_walk_duration/ { icyc+=$1 } /itlb_misses_walk_completed/ { imiss+=$1 } /dtlb_.*_walk_duration/ { dcyc+=$1 } /dtlb_.*.*completed/ { dmiss+=$1 } END {print "itlb cyc/miss: ", icyc/imiss/3.3, " dtlb cyc/miss: ", dcyc/dmiss/3.3, " ----- ", icyc,imiss, dcyc,dmiss }' itlb ns/miss: 9.45338 dtlb ns/miss: 12.9716 Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Link: http://lkml.kernel.org/r/20140731154103.10C1115E@viggo.jf.intel.com Acked-by: Rik van Riel <riel@redhat.com> Acked-by: Mel Gorman <mgorman@suse.de> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| * | | | | | | | x86/mm: New tunable for single vs full TLB flushDave Hansen2014-07-311-0/+46
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Most of the logic here is in the documentation file. Please take a look at it. I know we've come full-circle here back to a tunable, but this new one is *WAY* simpler. I challenge anyone to describe in one sentence how the old one worked. Here's the way the new one works: If we are flushing more pages than the ceiling, we use the full flush, otherwise we use per-page flushes. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Link: http://lkml.kernel.org/r/20140731154101.12B52CAF@viggo.jf.intel.com Acked-by: Rik van Riel <riel@redhat.com> Acked-by: Mel Gorman <mgorman@suse.de> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| * | | | | | | | x86/mm: Add tracepoints for TLB flushesDave Hansen2014-07-313-2/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We don't have any good way to figure out what kinds of flushes are being attempted. Right now, we can try to use the vm counters, but those only tell us what we actually did with the hardware (one-by-one vs full) and don't tell us what was actually _requested_. This allows us to select out "interesting" TLB flushes that we might want to optimize (like the ranged ones) and ignore the ones that we have very little control over (the ones at context switch). Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Link: http://lkml.kernel.org/r/20140731154059.4C96CBA5@viggo.jf.intel.com Acked-by: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| * | | | | | | | x86/mm: Unify remote INVLPG codeDave Hansen2014-07-311-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There are currently three paths through the remote flush code: 1. full invalidation 2. single page invalidation using invlpg 3. ranged invalidation using invlpg This takes 2 and 3 and combines them in to a single path by making the single-page one just be the start and end be start plus a single page. This makes placement of our tracepoint easier. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Link: http://lkml.kernel.org/r/20140731154058.E0F90408@viggo.jf.intel.com Cc: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| * | | | | | | | x86/mm: Fix missed global TLB flush statDave Hansen2014-07-311-8/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If we take the if (end == TLB_FLUSH_ALL || vmflag & VM_HUGETLB) { local_flush_tlb(); goto out; } path out of flush_tlb_mm_range(), we will have flushed the tlb, but not incremented NR_TLB_LOCAL_FLUSH_ALL. This unifies the way out of the function so that we always take a single path when doing a full tlb flush. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Link: http://lkml.kernel.org/r/20140731154056.FF763B76@viggo.jf.intel.com Acked-by: Rik van Riel <riel@redhat.com> Acked-by: Mel Gorman <mgorman@suse.de> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| * | | | | | | | x86/mm: Rip out complicated, out-of-date, buggy TLB flushingDave Hansen2014-07-315-121/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | I think the flush_tlb_mm_range() code that tries to tune the flush sizes based on the CPU needs to get ripped out for several reasons: 1. It is obviously buggy. It uses mm->total_vm to judge the task's footprint in the TLB. It should certainly be using some measure of RSS, *NOT* ->total_vm since only resident memory can populate the TLB. 2. Haswell, and several other CPUs are missing from the intel_tlb_flushall_shift_set() function. Thus, it has been demonstrated to bitrot quickly in practice. 3. It is plain wrong in my vm: [ 0.037444] Last level iTLB entries: 4KB 0, 2MB 0, 4MB 0 [ 0.037444] Last level dTLB entries: 4KB 0, 2MB 0, 4MB 0 [ 0.037444] tlb_flushall_shift: 6 Which leads to it to never use invlpg. 4. The assumptions about TLB refill costs are wrong: http://lkml.kernel.org/r/1337782555-8088-3-git-send-email-alex.shi@intel.com (more on this in later patches) 5. I can not reproduce the original data: https://lkml.org/lkml/2012/5/17/59 I believe the sample times were too short. Running the benchmark in a loop yields times that vary quite a bit. Note that this leaves us with a static ceiling of 1 page. This is a conservative, dumb setting, and will be revised in a later patch. This also removes the code which attempts to predict whether we are flushing data or instructions. We expect instruction flushes to be relatively rare and not worth tuning for explicitly. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Link: http://lkml.kernel.org/r/20140731154055.ABC88E89@viggo.jf.intel.com Acked-by: Rik van Riel <riel@redhat.com> Acked-by: Mel Gorman <mgorman@suse.de> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| * | | | | | | | x86/mm: Clean up the TLB flushing codeDave Hansen2014-07-311-12/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The if (cpumask_any_but(mm_cpumask(mm), smp_processor_id()) < nr_cpu_ids) line of code is not exactly the easiest to audit, especially when it ends up at two different indentation levels. This eliminates one of the the copy-n-paste versions. It also gives us a unified exit point for each path through this function. We need this in a minute for our tracepoint. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Link: http://lkml.kernel.org/r/20140731154054.44F1CDDC@viggo.jf.intel.com Acked-by: Rik van Riel <riel@redhat.com> Acked-by: Mel Gorman <mgorman@suse.de> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| * | | | | | | | x86/smep: Be more informative when signalling an SMEP faultJiri Kosina2014-06-111-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If pagefault triggers due to SMEP triggering, it can't be really easily distinguished from any other oops-causing pagefault, which might lead to quite some confusion when trying to understand the reason for the oops. Print an explanatory message in case the fault happened during instruction fetch for _PAGE_USER page which is present and executable on SMEP-enabled CPUs. This is consistent with what we are doing for NX already; in addition to immediately seeing from the oops what might be happening, it can even easily give a good indication to sysadmins who are carefully monitoring their kernel logs that someone might be trying to pwn them. Signed-off-by: Jiri Kosina <jkosina@suse.cz> Link: http://lkml.kernel.org/r/alpine.LNX.2.00.1406102248490.1321@pobox.suse.cz Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
* | | | | | | | | Merge branch 'x86-efi-for-linus' of ↵Linus Torvalds2014-08-0415-484/+476
|\ \ \ \ \ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull EFI changes from Ingo Molnar: "Main changes in this cycle are: - arm64 efi stub fixes, preservation of FP/SIMD registers across firmware calls, and conversion of the EFI stub code into a static library - Ard Biesheuvel - Xen EFI support - Daniel Kiper - Support for autoloading the efivars driver - Lee, Chun-Yi - Use the PE/COFF headers in the x86 EFI boot stub to request that the stub be loaded with CONFIG_PHYSICAL_ALIGN alignment - Michael Brown - Consolidate all the x86 EFI quirks into one file - Saurabh Tangri - Additional error logging in x86 EFI boot stub - Ulf Winkelvos - Support loading initrd above 4G in EFI boot stub - Yinghai Lu - EFI reboot patches for ACPI hardware reduced platforms" * 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (31 commits) efi/arm64: Handle missing virtual mapping for UEFI System Table arch/x86/xen: Silence compiler warnings xen: Silence compiler warnings x86/efi: Request desired alignment via the PE/COFF headers x86/efi: Add better error logging to EFI boot stub efi: Autoload efivars efi: Update stale locking comment for struct efivars arch/x86: Remove efi_set_rtc_mmss() arch/x86: Replace plain strings with constants xen: Put EFI machinery in place xen: Define EFI related stuff arch/x86: Remove redundant set_bit(EFI_MEMMAP) call arch/x86: Remove redundant set_bit(EFI_SYSTEM_TABLES) call efi: Introduce EFI_PARAVIRT flag arch/x86: Do not access EFI memory map if it is not available efi: Use early_mem*() instead of early_io*() arch/ia64: Define early_memunmap() x86/reboot: Add EFI reboot quirk for ACPI Hardware Reduced flag efi/reboot: Allow powering off machines using EFI efi/reboot: Add generic wrapper around EfiResetSystem() ...
OpenPOWER on IntegriCloud