linaro-kernel June 2015

linaro-kernel@lists.linaro.org

70 participants
141 discussions

[PATCH 00/34] CPUFreq: Move freq change notifications out of drivers

by Viresh Kumar

Another 452 lines gone :) Total stats upto now for all the 5 patchsets: Viresh Kumar (186): ... 69 files changed, 700 insertions(+), 2451 deletions(-) Net: 1751 lines gone.. -----x-------------x---------------- Most of the drivers do following in their ->target_index() routines: struct cpufreq_freqs freqs; freqs.old = old freq... freqs.new = new freq... cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE); /* Change rate here */ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE); This is replicated over all cpufreq drivers today and there doesn't exists a good enough reason why this shouldn't be moved to cpufreq core instead. There are few special cases though, like exynos5440, which doesn't do everything on the call to ->target_index() routine and call some kind of bottom halves for doing this work, work/tasklet/etc.. They may continue doing notification from their own code and so this patch introduces another flag: CPUFREQ_NO_NOTIFICATION, which will be set by such drivers. This is Fifth part of my cleanup work for CPUFreq, first three are (And obviously its rebased over them): 1: cpufreq: Introduce cpufreq_table_validate_and_show() https://lkml.org/lkml/2013/8/8/263 2: cpufreq: define generic routines for cpufreq drivers https://lkml.org/lkml/2013/8/10/48 3. CPUFreq: Implement light weight ->target(): for 3.13 https://lkml.org/lkml/2013/8/13/349 4. CPUFreq: set policy->cur in cpufreq core instead of drivers https://lkml.org/lkml/2013/8/14/288 All these are pushed here: https://git.linaro.org/gitweb?p=people/vireshk/linux.git;a=shortlog;h=refs/… -- viresh Cc: Andrew Lunn <andrew(a)lunn.ch> Cc: David S. Miller <davem(a)davemloft.net> Cc: Dmitry Eremin-Solenikov <dbaryshkov(a)gmail.com> Cc: Eric Miao <eric.y.miao(a)gmail.com> Cc: Hans-Christian Egtvedt <egtvedt(a)samfundet.no> Cc: Jesper Nilsson <jesper.nilsson(a)axis.com> Cc: John Crispin <blogic(a)openwrt.org> Cc: Kukjin Kim <kgene.kim(a)samsung.com> Cc: Linus Walleij <linus.walleij(a)linaro.org> Cc: linux-cris-kernel(a)axis.com Cc: Mikael Starvik <starvik(a)axis.com> Cc: Russell King <linux(a)arm.linux.org.uk> Cc: Santosh Shilimkar <santosh.shilimkar(a)ti.com> Cc: Sekhar Nori <nsekhar(a)ti.com> Cc: Shawn Guo <shawn.guo(a)linaro.org> Cc: sparclinux(a)vger.kernel.org Cc: spear-devel(a)list.st.com Cc: Stephen Warren <swarren(a)nvidia.com> Cc: Steven Miao <realmz6(a)gmail.com> Cc: Tony Luck <tony.luck(a)intel.com> Viresh Kumar (34): cpufreq: move freq change notifications to cpufreq core cpufreq: acpi: remove calls to cpufreq_notify_transition() cpufreq: arm_big_little: remove calls to cpufreq_notify_transition() cpufreq: at32ap: remove calls to cpufreq_notify_transition() cpufreq: blackfin: remove calls to cpufreq_notify_transition() cpufreq: cpu0: remove calls to cpufreq_notify_transition() cpufreq: cris: remove calls to cpufreq_notify_transition() cpufreq: davinci: remove calls to cpufreq_notify_transition() cpufreq: dbx500: remove calls to cpufreq_notify_transition() cpufreq: e_powersaver: remove calls to cpufreq_notify_transition() cpufreq: elanfreq: remove calls to cpufreq_notify_transition() cpufreq: exynos: remove calls to cpufreq_notify_transition() cpufreq: exynos5440: set CPUFREQ_NO_NOTIFICATION flag cpufreq: ia64-acpi: remove calls to cpufreq_notify_transition() cpufreq: imx6q: remove calls to cpufreq_notify_transition() cpufreq: kirkwood: remove calls to cpufreq_notify_transition() cpufreq: longhaul: set CPUFREQ_NO_NOTIFICATION flag cpufreq: loongson2: remove calls to cpufreq_notify_transition() cpufreq: maple: remove calls to cpufreq_notify_transition() cpufreq: omap: remove calls to cpufreq_notify_transition() cpufreq: p4-clockmod: remove calls to cpufreq_notify_transition() cpufreq: pasemi: remove calls to cpufreq_notify_transition() cpufreq: pmac: remove calls to cpufreq_notify_transition() cpufreq: powernow: remove calls to cpufreq_notify_transition() cpufreq: ppc: remove calls to cpufreq_notify_transition() cpufreq: pxa: remove calls to cpufreq_notify_transition() cpufreq: s3c: remove calls to cpufreq_notify_transition() cpufreq: s5pv210: remove calls to cpufreq_notify_transition() cpufreq: sa11x0: remove calls to cpufreq_notify_transition() cpufreq: sc520: remove calls to cpufreq_notify_transition() cpufreq: sparc: remove calls to cpufreq_notify_transition() cpufreq: SPEAr: remove calls to cpufreq_notify_transition() cpufreq: speedstep: remove calls to cpufreq_notify_transition() cpufreq: tegra: remove calls to cpufreq_notify_transition() drivers/cpufreq/acpi-cpufreq.c | 14 ++------- drivers/cpufreq/arm_big_little.c | 25 ++-------------- drivers/cpufreq/at32ap-cpufreq.c | 22 ++++++-------- drivers/cpufreq/blackfin-cpufreq.c | 22 +++++--------- drivers/cpufreq/cpufreq-cpu0.c | 33 ++++++++------------- drivers/cpufreq/cpufreq.c | 34 +++++++++++++++++++++ drivers/cpufreq/cris-artpec3-cpufreq.c | 8 ----- drivers/cpufreq/cris-etraxfs-cpufreq.c | 8 ----- drivers/cpufreq/davinci-cpufreq.c | 30 +++++++------------ drivers/cpufreq/dbx500-cpufreq.c | 22 +------------- drivers/cpufreq/e_powersaver.c | 23 ++------------- drivers/cpufreq/elanfreq.c | 13 -------- drivers/cpufreq/exynos-cpufreq.c | 28 +++++------------- drivers/cpufreq/exynos5440-cpufreq.c | 2 +- drivers/cpufreq/ia64-acpi-cpufreq.c | 19 ------------ drivers/cpufreq/imx6q-cpufreq.c | 39 ++++++++++-------------- drivers/cpufreq/kirkwood-cpufreq.c | 54 +++++++++++++--------------------- drivers/cpufreq/longhaul.c | 1 + drivers/cpufreq/loongson2_cpufreq.c | 16 ---------- drivers/cpufreq/maple-cpufreq.c | 18 +----------- drivers/cpufreq/omap-cpufreq.c | 39 +++++++++--------------- drivers/cpufreq/p4-clockmod.c | 10 ------- drivers/cpufreq/pasemi-cpufreq.c | 14 +-------- drivers/cpufreq/pmac32-cpufreq.c | 20 +++---------- drivers/cpufreq/pmac64-cpufreq.c | 18 +----------- drivers/cpufreq/powernow-k6.c | 8 ----- drivers/cpufreq/powernow-k7.c | 11 +------ drivers/cpufreq/powernow-k8.c | 15 +--------- drivers/cpufreq/ppc-corenet-cpufreq.c | 19 +----------- drivers/cpufreq/ppc_cbe_cpufreq.c | 19 +----------- drivers/cpufreq/pxa2xx-cpufreq.c | 27 ++++------------- drivers/cpufreq/pxa3xx-cpufreq.c | 12 -------- drivers/cpufreq/s3c2416-cpufreq.c | 21 +++---------- drivers/cpufreq/s3c64xx-cpufreq.c | 48 ++++++++++-------------------- drivers/cpufreq/s5pv210-cpufreq.c | 16 ++++------ drivers/cpufreq/sa1100-cpufreq.c | 17 ++++------- drivers/cpufreq/sa1110-cpufreq.c | 12 ++------ drivers/cpufreq/sc520_freq.c | 11 ------- drivers/cpufreq/sparc-us2e-cpufreq.c | 7 ----- drivers/cpufreq/sparc-us3-cpufreq.c | 7 ----- drivers/cpufreq/spear-cpufreq.c | 13 +------- drivers/cpufreq/speedstep-centrino.c | 20 +------------ drivers/cpufreq/speedstep-ich.c | 9 ------ drivers/cpufreq/speedstep-smi.c | 7 ----- drivers/cpufreq/tegra-cpufreq.c | 25 ++++------------ include/linux/cpufreq.h | 6 ++++ 46 files changed, 205 insertions(+), 657 deletions(-) -- 1.7.12.rc2.18.g61b472e

6 years, 6 months

[RESEND PATCH] arm64: kgdb: fix single stepping

by AKASHI Takahiro

Jason, Could you please review my patch below? See also arm64 maintainer's comment: http://lists.infradead.org/pipermail/linux-arm-kernel/2015-January/313712.h… Thanks, -Takahiro AKASHI I tried to verify kgdb in vanilla kernel on fast model, but it seems that the single stepping with kgdb doesn't work correctly since its first appearance at v3.15. On v3.15, 'stepi' command after breaking the kernel at some breakpoint steps forward to the next instruction, but the succeeding 'stepi' never goes beyond that. On v3.16, 'stepi' moves forward and stops at the next instruction just after enable_dbg in el1_dbg, and never goes beyond that. This variance of behavior seems to come in with the following patch in v3.16: commit 2a2830703a23 ("arm64: debug: avoid accessing mdscr_el1 on fault paths where possible") This patch (1) moves kgdb_disable_single_step() from 'c' command handling to single step handler. This makes sure that single stepping gets effective at every 's' command. Please note that, under the current implementation, single step bit in spsr, which is cleared by the first single stepping, will not be set again for the consecutive 's' commands because single step bit in mdscr is still kept on (that is, kernel_active_single_step() in kgdb_arch_handle_exception() is true). (2) re-implements kgdb_roundup_cpus() because the current implementation enabled interrupts naively. See below. (3) removes 'enable_dbg' in el1_dbg. Single step bit in mdscr is turned on in do_handle_exception()-> kgdb_handle_expection() before returning to debugged context, and if debug exception is enabled in el1_dbg, we will see unexpected single- stepping in el1_dbg. Since v3.18, the following patch does the same: commit 1059c6bf8534 ("arm64: debug: don't re-enable debug exceptions on return from el1_dbg) (4) masks interrupts while single-stepping one instruction. If an interrupt is caught during processing a single-stepping, debug exception is unintentionally enabled by el1_irq's 'enable_dbg' before returning to debugged context. Thus, like in (2), we will see unexpected single-stepping in el1_irq. Basically (1) and (2) are for v3.15, (3) and (4) for v3.1[67]. * issue fixed by (2): Without (2), we would see another problem if a breakpoint is set at interrupt-sensible places, like gic_handle_irq(): KGDB: re-enter error: breakpoint removed ffffffc000081258 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 650 at kernel/debug/debug_core.c:435 kgdb_handle_exception+0x1dc/0x1f4() Modules linked in: CPU: 0 PID: 650 Comm: sh Not tainted 3.17.0-rc2+ #177 Call trace: [<ffffffc000087fac>] dump_backtrace+0x0/0x130 [<ffffffc0000880ec>] show_stack+0x10/0x1c [<ffffffc0004d683c>] dump_stack+0x74/0xb8 [<ffffffc0000ab824>] warn_slowpath_common+0x8c/0xb4 [<ffffffc0000ab90c>] warn_slowpath_null+0x14/0x20 [<ffffffc000121bfc>] kgdb_handle_exception+0x1d8/0x1f4 [<ffffffc000092ffc>] kgdb_brk_fn+0x18/0x28 [<ffffffc0000821c8>] brk_handler+0x9c/0xe8 [<ffffffc0000811e8>] do_debug_exception+0x3c/0xac Exception stack(0xffffffc07e027650 to 0xffffffc07e027770) ... [<ffffffc000083cac>] el1_dbg+0x14/0x68 [<ffffffc00012178c>] kgdb_cpu_enter+0x464/0x5c0 [<ffffffc000121bb4>] kgdb_handle_exception+0x190/0x1f4 [<ffffffc000092ffc>] kgdb_brk_fn+0x18/0x28 [<ffffffc0000821c8>] brk_handler+0x9c/0xe8 [<ffffffc0000811e8>] do_debug_exception+0x3c/0xac Exception stack(0xffffffc07e027ac0 to 0xffffffc07e027be0) ... [<ffffffc000083cac>] el1_dbg+0x14/0x68 [<ffffffc00032e4b4>] __handle_sysrq+0x11c/0x190 [<ffffffc00032e93c>] write_sysrq_trigger+0x4c/0x60 [<ffffffc0001e7d58>] proc_reg_write+0x54/0x84 [<ffffffc000192fa4>] vfs_write+0x98/0x1c8 [<ffffffc0001939b0>] SyS_write+0x40/0xa0 Once some interrupt occurs, a breakpoint at gic_handle_irq() triggers kgdb. Kgdb then calls kgdb_roundup_cpus() to sync with other cpus. Current kgdb_roundup_cpus() unmasks interrupts temporarily to use smp_call_function(). This eventually allows another interrupt to occur and likely results in hitting a breakpoint at gic_handle_irq() again since debug exception is always enabled in el1_irq. We can avoid this issue by specifying "nokgdbroundup" in kernel parameter, but this will also leave other cpus be in unknown state in terms of kgdb, and may result in interfering with kgdb activity. Signed-off-by: AKASHI Takahiro <takahiro.akashi(a)linaro.org> --- arch/arm64/kernel/kgdb.c | 60 +++++++++++++++++++++++++++++++++++----------- 1 file changed, 46 insertions(+), 14 deletions(-) diff --git a/arch/arm64/kernel/kgdb.c b/arch/arm64/kernel/kgdb.c index a0d10c5..81b5910 100644 --- a/arch/arm64/kernel/kgdb.c +++ b/arch/arm64/kernel/kgdb.c @@ -19,9 +19,13 @@ * along with this program. If not, see <http://www.gnu.org/licenses/>. */ +#include <linux/cpumask.h> #include <linux/irq.h> +#include <linux/irq_work.h> #include <linux/kdebug.h> #include <linux/kgdb.h> +#include <linux/percpu.h> +#include <asm/ptrace.h> #include <asm/traps.h> struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = { @@ -95,6 +99,9 @@ struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = { { "fpcr", 4, -1 }, }; +static DEFINE_PER_CPU(unsigned int, kgdb_pstate); +static DEFINE_PER_CPU(struct irq_work, kgdb_irq_work); + char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs) { if (regno >= DBG_MAX_REG_NUM || regno < 0) @@ -176,18 +183,14 @@ int kgdb_arch_handle_exception(int exception_vector, int signo, * over and over again. */ kgdb_arch_update_addr(linux_regs, remcom_in_buffer); - atomic_set(&kgdb_cpu_doing_single_step, -1); - kgdb_single_step = 0; - - /* - * Received continue command, disable single step - */ - if (kernel_active_single_step()) - kernel_disable_single_step(); err = 0; break; case 's': + /* mask interrupts while single stepping */ + __this_cpu_write(kgdb_pstate, linux_regs->pstate); + linux_regs->pstate |= PSR_I_BIT; + /* * Update step address value with address passed * with step packet. @@ -198,8 +201,6 @@ int kgdb_arch_handle_exception(int exception_vector, int signo, */ kgdb_arch_update_addr(linux_regs, remcom_in_buffer); atomic_set(&kgdb_cpu_doing_single_step, raw_smp_processor_id()); - kgdb_single_step = 1; - /* * Enable single step handling */ @@ -229,6 +230,18 @@ static int kgdb_compiled_brk_fn(struct pt_regs *regs, unsigned int esr) static int kgdb_step_brk_fn(struct pt_regs *regs, unsigned int esr) { + unsigned int pstate; + + kernel_disable_single_step(); + atomic_set(&kgdb_cpu_doing_single_step, -1); + + /* restore interrupt mask status */ + pstate = __this_cpu_read(kgdb_pstate); + if (pstate & PSR_I_BIT) + regs->pstate |= PSR_I_BIT; + else + regs->pstate &= ~PSR_I_BIT; + kgdb_handle_exception(1, SIGTRAP, 0, regs); return 0; } @@ -249,16 +262,27 @@ static struct step_hook kgdb_step_hook = { .fn = kgdb_step_brk_fn }; -static void kgdb_call_nmi_hook(void *ignored) +static void kgdb_roundup_hook(struct irq_work *work) { kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs()); } void kgdb_roundup_cpus(unsigned long flags) { - local_irq_enable(); - smp_call_function(kgdb_call_nmi_hook, NULL, 0); - local_irq_disable(); + int cpu; + struct cpumask mask; + struct irq_work *work; + + mask = *cpu_online_mask; + cpumask_clear_cpu(smp_processor_id(), &mask); + cpu = cpumask_first(&mask); + if (cpu >= nr_cpu_ids) + return; + + for_each_cpu(cpu, &mask) { + work = per_cpu_ptr(&kgdb_irq_work, cpu); + irq_work_queue_on(work, cpu); + } } static int __kgdb_notify(struct die_args *args, unsigned long cmd) @@ -299,6 +323,8 @@ static struct notifier_block kgdb_notifier = { int kgdb_arch_init(void) { int ret = register_die_notifier(&kgdb_notifier); + int cpu; + struct irq_work *work; if (ret != 0) return ret; @@ -306,6 +332,12 @@ int kgdb_arch_init(void) register_break_hook(&kgdb_brkpt_hook); register_break_hook(&kgdb_compiled_brkpt_hook); register_step_hook(&kgdb_step_hook); + + for_each_possible_cpu(cpu) { + work = per_cpu_ptr(&kgdb_irq_work, cpu); + init_irq_work(work, kgdb_roundup_hook); + } + return 0; } -- 1.7.9.5

7 years, 7 months

[PATCH V2 00/10] cpufreq: governor: Avoid invalid state-transitions

by Viresh Kumar

Hi Rafael/Preeti, This is another attempt to fix the crashes reported by Preeti. They work quite well for me now, and I hope they would work well for Preeti as well :) So, patches [1-7,9] are already Reviewed by Preeti. The first 5 patches are minor cleanups, 6th & 7th try to optimize few things to make code less complex. Patches 8-10 actually solve (or try to solve :)) the synchronization problems, or the crashes I was getting. V1->V2: - 7/11 is dropped and only 8/11 is updated, which is 8/10 now. - Avoid taking the same mutex in both cpufreq_governor_dbs() and work-handler as that has given us some locdeps, classic ABBA stuff. - And so timer_mutex, responsible for synchronizing governor work-handlers is kept as is. - Later patches are almost same with minor updates. - Invalid state-transitions are sensed better now with improved checks. - I have run enough tests on my exynos dual core board and failed to crash at all. Not that I wanted to crash :) Rebased over pm/bleeeding-edge. Viresh Kumar (10): cpufreq: governor: Name delayed-work as dwork cpufreq: governor: Drop unused field 'cpu' cpufreq: governor: Rename 'cpu_dbs_common_info' to 'cpu_dbs_info' cpufreq: governor: name pointer to cpu_dbs_info as 'cdbs' cpufreq: governor: rename cur_policy as policy cpufreq: governor: Keep single copy of information common to policy->cpus cpufreq: governor: split out common part of {cs|od}_dbs_timer() cpufreq: governor: Avoid invalid states with additional checks cpufreq: governor: Don't WARN on invalid states cpufreq: propagate errors returned from __cpufreq_governor() drivers/cpufreq/cpufreq.c | 22 ++-- drivers/cpufreq/cpufreq_conservative.c | 25 ++--- drivers/cpufreq/cpufreq_governor.c | 196 ++++++++++++++++++++++++--------- drivers/cpufreq/cpufreq_governor.h | 40 ++++--- drivers/cpufreq/cpufreq_ondemand.c | 67 ++++++----- 5 files changed, 220 insertions(+), 130 deletions(-) -- 2.4.0

8 years, 4 months

[PATCH v5 0/2] arm64: kvm: reset hyp context for kexec

by AKASHI Takahiro

This patch was initially intended to address a KVM issue described in Geoff's kexec patch set[1]. But now the title of patch#1 would be more suitable for the entire code as it was overhauled and, since the 4th version, the fix is implemented as kvm cpu hotplug after Mark's comment. I confirmed that it works with kexec under the following scenarios: - boot 1st kernel - run a guest OS - (stop a guest OS) - reboot 2nd kernel by kexec - run a guest OS test target: MediaTek MT8173-EVB version: kernel v4.0-rc1 + Geoff's kexec v8 + Ard's patch[2] But I didn't test other complicated scenarios with cpu hotplug. On arm, Frediano[3] is no longer working on this issue as he left his company. So patch#1 also has a stub definition for arm. Changes from v4: * restructured the patchset as cpu_init_hyp_mode() and kvm_cpu_reset() were renamed to kvm_arch_hardware_{enable,disable}() respectively * omitted some obvious arguments from __cpu_reset_hyp_mode(). Changes from v3: * modified to use kvm cpu hotplug framework directly instead of reboot notifier hook Changes from v2: * modified kvm_virt_to_trampoline() macro to fix a page-alignment issue[4] Changes from v1: * modified kvm_cpu_reset() implementation: - define a macro to translate va to addr in trampoline - use __hyp_default_vectors instead of kvm_get_hyp_stub_vectors() - shuffle the arguments in __cpu_reset_hyp_mode() - optimize TLB flush operations * changed a patch#2's name * added a patch#5 to add stub code for arm [1] http://lists.infradead.org/pipermail/kexec/2015-April/335533.html [2] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-March/334002.html [3] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-February/322231.… [4] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-March/334910.html AKASHI Takahiro (2): arm64: kvm: allows kvm cpu hotplug arm64: kvm: remove !KEXEC dependency arch/arm/include/asm/kvm_host.h | 10 ++++++- arch/arm/include/asm/kvm_mmu.h | 1 + arch/arm/kvm/arm.c | 58 ++++++++++++------------------------- arch/arm/kvm/mmu.c | 5 ++++ arch/arm64/include/asm/kvm_host.h | 11 ++++++- arch/arm64/include/asm/kvm_mmu.h | 1 + arch/arm64/include/asm/virt.h | 9 ++++++ arch/arm64/kvm/Kconfig | 1 - arch/arm64/kvm/hyp-init.S | 33 +++++++++++++++++++++ arch/arm64/kvm/hyp.S | 32 +++++++++++++++++--- 10 files changed, 114 insertions(+), 47 deletions(-) -- 1.7.9.5

8 years, 6 months

[v2 0/5] arm64: add kdump support

by AKASHI Takahiro

This patch set enables kdump (crash dump kernel) support on arm64 on top of Geoff's kexec patchset. In this version, there are some arm64-specific usage/constraints: 1) "mem=" boot parameter must be specified on crash dump kernel if the system starts on uefi. 2) Kvm will not be enabled on crash dump kernel even if configured See commit messages and Documentation/kdump/kdump.txt for details. The only concern I have is whether or not we can use the exact same kernel as both system kernel and crash dump kernel. The current arm64 kernel is not relocatable in the exact sense but I see no problems in using the same binary when testing kdump. I tested the code with - ATF v1.1 + EDK2(UEFI) v3.0-rc0 - kernel v4.0 + Geoff' kexec v9 on - Base fast model, and - MediaTek MT8173-EVB using my own kexec-tools [1], currently v0.12. You may want to start a kernel with the following boot parameter: crashkernel=64M (or so, on model) and try $ kexec -p --load <vmlinux> --append ... $ echo c > /proc/sysrq-trigger To examine vmcore (/proc/vmcore), you should use - gdb v7.7 or later - crash + a small patch (to recognize v4.0 kernel) Changes from v1: * rebased to Geoff's v9 * tested this patchset on real hardware and fixed bugs: - added cache flush operation in ipi_cpu_stop() when shutting down the system. Otherwise, data saved in vmcore's note sections by crash_save_cpu() might not be flushed to dumped memory and crash command fail to fetch correct data. I will address Mark's commit[2] after Geoff takes care of it on kexec. - modified to use ioremap_cache() instead of ioremap() when reading crash memory. Otherwise, accessing /proc/vmcore on crash dump kernel might cause an alignment fault. * allows reserve_crashkernel() to handle "crashkernel=xyz[MG]" correctly, thanks to Pratyush Anand. And it now also enforces memory limit. * moved reserve_crashkernel() and reserve_elfcorehdr() to arm64_memblock_init() to clarify that they should be called before dma_contignuous_reserve(). [1] https://git.linaro.org/people/takahiro.akashi/kexec-tools.git [2] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-April/338171.html AKASHI Takahiro (5): arm64: kdump: reserve memory for crash dump kernel arm64: kdump: implement machine_crash_shutdown() arm64: kdump: do not go into EL2 before starting a crash dump kernel arm64: add kdump support arm64: enable kdump in the arm64 defconfig Documentation/kdump/kdump.txt | 31 +++++++++++++- arch/arm64/Kconfig | 12 ++++++ arch/arm64/configs/defconfig | 1 + arch/arm64/include/asm/kexec.h | 34 ++++++++++++++- arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/crash_dump.c | 71 +++++++++++++++++++++++++++++++ arch/arm64/kernel/machine_kexec.c | 55 +++++++++++++++++++++++- arch/arm64/kernel/process.c | 7 +++- arch/arm64/kernel/setup.c | 8 +++- arch/arm64/kernel/smp.c | 12 +++++- arch/arm64/mm/init.c | 84 +++++++++++++++++++++++++++++++++++++ 11 files changed, 309 insertions(+), 7 deletions(-) create mode 100644 arch/arm64/kernel/crash_dump.c -- 1.7.9.5

8 years, 8 months

[PATCH] bus: subsys: propagate errors from subsys interface's ->add_dev()

by Viresh Kumar

->add_dev() may fail and the error returned from it can be useful for the caller. For example, if some of the resources aren't ready yet and -EPROBE_DEFER is returned from ->add_dev(), then the owner of 'struct subsys_interface' may want to try probing again at a later point of time. And that requires a proper return value from ->add_dev(). Also, if we hit an error while registering subsys_interface, then we should stop proceeding further and rollback whatever has been done until then. Break part of subsys_interface_unregister() into another routine, which lets us call ->remove_dev() for all devices for which ->add_dev() is already called. Cc: 3.3+ <stable(a)vger.kernel.org> # 3.3+ Fixes: ca22e56debc5 ("driver-core: implement 'sysdev' functionality for regular devices and buses") Reported-and-tested-by: Pi-Cheng Chen <pi-cheng.chen(a)linaro.org> Signed-off-by: Viresh Kumar <viresh.kumar(a)linaro.org> --- drivers/base/bus.c | 55 ++++++++++++++++++++++++++++++++++-------------------- 1 file changed, 35 insertions(+), 20 deletions(-) diff --git a/drivers/base/bus.c b/drivers/base/bus.c index 79bc203f51ef..d92dc109ba51 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -1112,11 +1112,36 @@ void subsys_dev_iter_exit(struct subsys_dev_iter *iter) } EXPORT_SYMBOL_GPL(subsys_dev_iter_exit); +static void __subsys_interface_unregister(struct subsys_interface *sif, + struct device *lastdev) +{ + struct bus_type *subsys = sif->subsys; + struct subsys_dev_iter iter; + struct device *dev; + + mutex_lock(&subsys->p->mutex); + list_del_init(&sif->node); + if (sif->remove_dev) { + subsys_dev_iter_init(&iter, subsys, NULL, NULL); + while ((dev = subsys_dev_iter_next(&iter))) { + if (dev == lastdev) + break; + + sif->remove_dev(dev, sif); + } + subsys_dev_iter_exit(&iter); + } + mutex_unlock(&subsys->p->mutex); + + bus_put(subsys); +} + int subsys_interface_register(struct subsys_interface *sif) { struct bus_type *subsys; struct subsys_dev_iter iter; struct device *dev; + int ret = 0; if (!sif || !sif->subsys) return -ENODEV; @@ -1129,38 +1154,28 @@ int subsys_interface_register(struct subsys_interface *sif) list_add_tail(&sif->node, &subsys->p->interfaces); if (sif->add_dev) { subsys_dev_iter_init(&iter, subsys, NULL, NULL); - while ((dev = subsys_dev_iter_next(&iter))) - sif->add_dev(dev, sif); + while ((dev = subsys_dev_iter_next(&iter))) { + ret = sif->add_dev(dev, sif); + if (ret) + break; + } subsys_dev_iter_exit(&iter); } mutex_unlock(&subsys->p->mutex); - return 0; + if (ret) + __subsys_interface_unregister(sif, dev); + + return ret; } EXPORT_SYMBOL_GPL(subsys_interface_register); void subsys_interface_unregister(struct subsys_interface *sif) { - struct bus_type *subsys; - struct subsys_dev_iter iter; - struct device *dev; - if (!sif || !sif->subsys) return; - subsys = sif->subsys; - - mutex_lock(&subsys->p->mutex); - list_del_init(&sif->node); - if (sif->remove_dev) { - subsys_dev_iter_init(&iter, subsys, NULL, NULL); - while ((dev = subsys_dev_iter_next(&iter))) - sif->remove_dev(dev, sif); - subsys_dev_iter_exit(&iter); - } - mutex_unlock(&subsys->p->mutex); - - bus_put(subsys); + __subsys_interface_unregister(sif, NULL); } EXPORT_SYMBOL_GPL(subsys_interface_unregister); -- 2.4.0

8 years, 8 months

[PATCH 00/10] OPP: Add code to support operating-points-v2 bindings

by Viresh Kumar

Hi Guys, This adds code to support operating-points-v2 bindings. Not everything is supported yet, but most of the basic stuff is. Tested with: Exynos 5250, dual cortex A15 board. With both old and new bindings. Bindings are already frozen: http://marc.info/?i=cover.1433434659.git.viresh.kumar%40linaro.org Pushed here as well for reference: ssh://git@git.linaro.org/people/viresh.kumar/linux.git opp/v2 Viresh Kumar (10): opp: Relocate few routines OPP: Create _remove_device_opp() for freeing dev_opp OPP: Allocate dev_opp from _add_device_opp() OPP: Break _opp_add_dynamic() into smaller functions opp: Add support to parse "operating-points-v2" bindings OPP: Add clock-latency-ns support opp: Add OPP sharing information to OPP library OPP: Add support for opp-suspend opp: Add helpers for initializing CPU OPPs cpufreq-dt: Add support for operating-points-v2 bindings drivers/base/power/opp.c | 1063 ++++++++++++++++++++++++++++++++---------- drivers/cpufreq/cpufreq-dt.c | 58 ++- include/linux/pm_opp.h | 29 ++ 3 files changed, 902 insertions(+), 248 deletions(-) -- 2.4.0

8 years, 8 months

[PATCH 0/5] Second round of MCPM refactoring

by Nicolas Pitre

This is the sequel to the first episode that started here: http://article.gmane.org/gmane.linux.ports.arm.kernel/401353 Now that most of the first set has been merged upstream, here's the last set to complete the cleanup. This mainly includes the removal of the backward compatibility support plus some cosmetic changes. The hisi04 backend, though, is instead converted to raw SMP operations as it currently doesn't benefit from MCPM at all and doesn't fit well with the new backend structure. This series can also be obtained from the following Git repository: http://git.linaro.org/people/nicolas.pitre/linux.git mcpm The diffstat shows more code removal again: arch/arm/common/mcpm_entry.c | 281 +++++++++++++---------------- arch/arm/include/asm/mcpm.h | 73 +++----- arch/arm/mach-exynos/suspend.c | 8 +- arch/arm/mach-hisi/platmcpm.c | 127 +++++-------- drivers/cpuidle/cpuidle-big_little.c | 8 +- 5 files changed, 198 insertions(+), 299 deletions(-)

8 years, 8 months

[PATCH 00/41] clockevent: Migrate to new 'set-state' interface - Part 2

by Viresh Kumar

Hi Thomas/Daniel, The earlier patchset (sent with similar $subject) is picked up by Daniel for v4.3. This series is also targeted for v4.3 only. This series migrates rest of the drivers present in drivers/clocksource/ directory, to the new set-state interface. This would enable these drivers to use new states (like: ONESHOT_STOPPED, etc.) of a clockevent device (if required), as the set-mode interface is marked obsolete now and wouldn't be expanded to handle new states. Once all the drivers are migrated to the new interface in future, we can remove the code supporting '->mode' in clockevents core. Rebased over: git://git.linaro.org/people/daniel.lezcano/linux.git clockevents/4.3 And must be tested over this branch only due to dependencies on clockevent core changes. The patches in this series are independent of each other. This has been build/boot tested by two bots on various platforms for few days now: - kernelci, http://kernelci.org/ - 0-DAY kernel test infrastructure, kbuild test robot -- viresh Cc: Alexander Shiyan <shc_work(a)mail.ru> Cc: Alexandre Belloni <alexandre.belloni(a)free-electrons.com> Cc: Andrew Bresticker <abrestic(a)chromium.org> Cc: Andrew Lunn <andrew(a)lunn.ch> Cc: Andy Gross <agross(a)codeaurora.org> Cc: Barry Song <baohua(a)kernel.org> Cc: Baruch Siach <baruch(a)tkos.co.il> Cc: Carlo Caione <carlo(a)caione.org> Cc: Daniel Tang <dt.tangr(a)gmail.com> Cc: David Brown <davidb(a)codeaurora.org> Cc: Gregory Clement <gregory.clement(a)free-electrons.com> Cc: Heiko Stuebner <heiko(a)sntech.de> Cc: Jacob Pan <jacob.jun.pan(a)linux.intel.com> Cc: James Hogan <james.hogan(a)imgtec.com> Cc: Jamie Iles <jamie(a)jamieiles.com> Cc: Jason Cooper <jason(a)lakedaemon.net> Cc: Jean-Christophe Plagniol-Villard <plagnioj(a)jcrosoft.com> Cc: Jingchang Lu <b35083(a)freescale.com> Cc: Jonas Jensen <jonas.jensen(a)gmail.com> Cc: Kukjin Kim <kgene(a)kernel.org> Cc: Kukjin Kim <kgene.kim(a)samsung.com> Cc: Kumar Gala <galak(a)codeaurora.org> Cc: Laurent Pinchart <laurent.pinchart+renesas(a)ideasonboard.com> Cc: Linus Walleij <linus.walleij(a)linaro.org> Cc: Magnus Damm <damm+renesas(a)opensource.se> Cc: Mark Rutland <mark.rutland(a)arm.com> Cc: Matthias Brugger <matthias.bgg(a)gmail.com> Cc: Maxime Coquelin <mcoquelin.stm32(a)gmail.com> Cc: Maxime Ripard <maxime.ripard(a)free-electrons.com> Cc: Michal Simek <michal.simek(a)xilinx.com> Cc: Nicolas Ferre <nicolas.ferre(a)atmel.com> Cc: Oleksij Rempel <linux(a)rempel-privat.de> Cc: Paul Mundt <lethal(a)linux-sh.org> Cc: Robert Jarzmik <robert.jarzmik(a)free.fr> Cc: Russell King <linux(a)arm.linux.org.uk> Cc: Russell King <rmk+kernel(a)arm.linux.org.uk> Cc: Santosh Shilimkar <ssantosh(a)kernel.org> Cc: Sebastian Hesselbarth <sebastian.hesselbarth(a)gmail.com> Cc: Shawn Guo <shawn.guo(a)linaro.org> Cc: Sören Brinkmann <soren.brinkmann(a)xilinx.com> Cc: Stefan Agner <stefan(a)agner.ch> Cc: Stephen Boyd <sboyd(a)codeaurora.org> Cc: Stephen Warren <swarren(a)wwwdotorg.org> Cc: Steven J. Hill <Steven.Hill(a)imgtec.com> Cc: Thierry Reding <treding(a)nvidia.com> Cc: Tomasz Figa <tfiga(a)chromium.org> Cc: Tony Prisk <linux(a)prisktech.co.nz> Cc: Uwe Kleine-König <kernel(a)pengutronix.de> Cc: Xiubo Li <Li.Xiubo(a)freescale.com> Viresh Kumar (41): clocksource: asm9260: Migrate to new 'set-state' interface clocksource: cadence_ttc: Migrate to new 'set-state' interface clocksource: clps711x: Migrate to new 'set-state' interface clocksource: dummy_timer: Migrate to new 'set-state' interface clocksource: dw_apb: Migrate to new 'set-state' interface clocksource: exynos_mct: Migrate to new 'set-state' interface clocksource: fsl_ftm: Migrate to new 'set-state' interface clocksource: i8253: Migrate to new 'set-state' interface clocksource: meson6: Migrate to new 'set-state' interface clocksource: metag_generic: Migrate to new 'set-state' interface clocksource: mips-gic: Migrate to new 'set-state' interface clocksource: moxart: Migrate to new 'set-state' interface clocksource: mtk: Migrate to new 'set-state' interface clocksource: mxs: Migrate to new 'set-state' interface clocksource: nomadik-mtu: Migrate to new 'set-state' interface clocksource: pxa: Migrate to new 'set-state' interface clocksource: qcom: Migrate to new 'set-state' interface clocksource: rockchip: Migrate to new 'set-state' interface clocksource: samsung_pwm: Migrate to new 'set-state' interface clocksource: sh_cmt: Migrate to new 'set-state' interface clocksource: sh_mtu2: Migrate to new 'set-state' interface clocksource: sh_tmu: Migrate to new 'set-state' interface clocksource: sun4i: Migrate to new 'set-state' interface clocksource: tcb_clksrc: Migrate to new 'set-state' interface clocksource: tegra20: Migrate to new 'set-state' interface clocksource: time-armada-370-xp: Migrate to new 'set-state' interface clocksource: efm32: Migrate to new 'set-state' interface clocksource: orion: Migrate to new 'set-state' interface clocksource: atlas7: Migrate to new 'set-state' interface clocksource: atmel: Migrate to new 'set-state' interface clocksource: atmel-st: Migrate to new 'set-state' interface clocksource: digicolor: Migrate to new 'set-state' interface clocksource: integrator: Migrate to new 'set-state' interface clocksource: keystone: Migrate to new 'set-state' interface clocksource: prima2: Migrate to new 'set-state' interface clocksource: stm32: Migrate to new 'set-state' interface clocksource: sun5i: Migrate to new 'set-state' interface clocksource: u300: Migrate to new 'set-state' interface clocksource: vf_pit: Migrate to new 'set-state' interface clocksource: vt8500: Migrate to new 'set-state' interface clocksource: zevio: Migrate to new 'set-state' interface arch/x86/kernel/i8253.c | 2 +- drivers/clocksource/asm9260_timer.c | 61 +++++++----- drivers/clocksource/cadence_ttc_timer.c | 59 ++++++------ drivers/clocksource/clps711x-timer.c | 6 -- drivers/clocksource/dummy_timer.c | 10 -- drivers/clocksource/dw_apb_timer.c | 143 +++++++++++++++------------ drivers/clocksource/exynos_mct.c | 85 ++++++++-------- drivers/clocksource/fsl_ftm_timer.c | 35 ++++--- drivers/clocksource/i8253.c | 77 ++++++++------- drivers/clocksource/meson6_timer.c | 50 +++++----- drivers/clocksource/metag_generic.c | 20 ---- drivers/clocksource/mips-gic-timer.c | 7 -- drivers/clocksource/moxart_timer.c | 49 +++++----- drivers/clocksource/mtk_timer.c | 32 +++--- drivers/clocksource/mxs_timer.c | 80 ++++++--------- drivers/clocksource/nomadik-mtu.c | 58 +++++------ drivers/clocksource/pxa_timer.c | 39 +++----- drivers/clocksource/qcom-timer.c | 24 ++--- drivers/clocksource/rockchip_timer.c | 32 +++--- drivers/clocksource/samsung_pwm_timer.c | 41 ++++---- drivers/clocksource/sh_cmt.c | 62 ++++++------ drivers/clocksource/sh_mtu2.c | 42 +++----- drivers/clocksource/sh_tmu.c | 63 ++++++------ drivers/clocksource/sun4i_timer.c | 41 ++++---- drivers/clocksource/tcb_clksrc.c | 93 ++++++++++-------- drivers/clocksource/tegra20_timer.c | 40 ++++---- drivers/clocksource/time-armada-370-xp.c | 53 +++++----- drivers/clocksource/time-efm32.c | 66 +++++++------ drivers/clocksource/time-orion.c | 46 +++++---- drivers/clocksource/timer-atlas7.c | 19 ++-- drivers/clocksource/timer-atmel-pit.c | 41 ++++---- drivers/clocksource/timer-atmel-st.c | 69 +++++++------ drivers/clocksource/timer-digicolor.c | 41 ++++---- drivers/clocksource/timer-integrator-ap.c | 58 ++++++----- drivers/clocksource/timer-keystone.c | 44 +++------ drivers/clocksource/timer-prima2.c | 34 +++---- drivers/clocksource/timer-stm32.c | 30 +++--- drivers/clocksource/timer-sun5i.c | 45 +++++---- drivers/clocksource/timer-u300.c | 155 +++++++++++++++--------------- drivers/clocksource/vf_pit_timer.c | 27 +++--- drivers/clocksource/vt8500_timer.c | 29 ++---- drivers/clocksource/zevio-timer.c | 44 ++++----- 42 files changed, 1001 insertions(+), 1051 deletions(-) -- 2.4.0

8 years, 9 months

[RFC PATCH 0/3] clk: stm32: Add clock driver for STM32F4[23]xxx devices

by Daniel Thompson

This patchset implements a clock driver for STM32F42xxx and STM32F43xxx series devices. There are a few small caveats at the present: 1. Relies on "Add support to STMicroeletronics STM32 family", v8 by Maxime Coquelin: http://thread.gmane.org/gmane.linux.kernel.cross-arch/27569 2. Allocating ~80 clock components appears to fragment memory enough to prevent busybox (.text is ~300K, non-XIP) from running getty. I have to use "init=/bin/sh" to avoid OOM problems. 3. Support for I2S and SAI is not included in this patchset. Daniel Thompson (3): dt-bindings: Document the STM32F4 clock bindings clk: stm32: Add clock driver for STM32F4[23]xxx devices ARM: dts: stm32f429: Adopt STM32F4 clock driver .../devicetree/bindings/clock/st,stm32-rcc.txt | 65 ++++ arch/arm/boot/dts/stm32f429.dtsi | 83 ++--- drivers/clk/Makefile | 1 + drivers/clk/clk-stm32f4.c | 365 +++++++++++++++++++++ 4 files changed, 457 insertions(+), 57 deletions(-) create mode 100644 Documentation/devicetree/bindings/clock/st,stm32-rcc.txt create mode 100644 drivers/clk/clk-stm32f4.c -- 2.1.0

8 years, 9 months

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linaro-kernel June 2015