linaro-kernel November 2015

linaro-kernel@lists.linaro.org

54 participants
113 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

[PATCH v6] clk: mediatek: Export CPU mux clocks for CPU frequency control

by Pi-Cheng Chen

From: "pi-cheng.chen" <pi-cheng.chen(a)linaro.org> This patch adds CPU mux clocks which are used by Mediatek cpufreq driver for intermediate clock source switching. Signed-off-by: Pi-Cheng Chen <pi-cheng.chen(a)linaro.org> --- Changes in v6: - Relace __clk_get_num_parents with clk_hw_get_num_parents to reflect API change Changes in v5: - Replace __initdata with __initconst to fix compiling error Changes in v4: - Fix some minor issues for v3 - Rebase to the patch that adds 13mhz clock for MT8173[1] Changes in v3: - Rebase to 4.2-rc1 - Fix some issues of v2 Changes in v2: - Remove use of .determine_rate callback --- drivers/clk/mediatek/Makefile | 2 +- drivers/clk/mediatek/clk-cpumux.c | 127 +++++++++++++++++++++++++++++++++ drivers/clk/mediatek/clk-cpumux.h | 22 ++++++ drivers/clk/mediatek/clk-mt8173.c | 23 ++++++ include/dt-bindings/clock/mt8173-clk.h | 4 +- 5 files changed, 176 insertions(+), 2 deletions(-) create mode 100644 drivers/clk/mediatek/clk-cpumux.c create mode 100644 drivers/clk/mediatek/clk-cpumux.h diff --git a/drivers/clk/mediatek/Makefile b/drivers/clk/mediatek/Makefile index 8e4b2a4..299917a 100644 --- a/drivers/clk/mediatek/Makefile +++ b/drivers/clk/mediatek/Makefile @@ -1,4 +1,4 @@ -obj-y += clk-mtk.o clk-pll.o clk-gate.o +obj-y += clk-mtk.o clk-pll.o clk-gate.o clk-cpumux.o obj-$(CONFIG_RESET_CONTROLLER) += reset.o obj-y += clk-mt8135.o obj-y += clk-mt8173.o diff --git a/drivers/clk/mediatek/clk-cpumux.c b/drivers/clk/mediatek/clk-cpumux.c new file mode 100644 index 0000000..91b5238 --- /dev/null +++ b/drivers/clk/mediatek/clk-cpumux.c @@ -0,0 +1,127 @@ +/* + * Copyright (c) 2015 Linaro Ltd. + * Author: Pi-Cheng Chen <pi-cheng.chen(a)linaro.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/clk-provider.h> +#include <linux/mfd/syscon.h> +#include <linux/slab.h> + +#include "clk-mtk.h" +#include "clk-cpumux.h" + +struct mtk_clk_cpumux { + struct clk_hw hw; + struct regmap *regmap; + u32 reg; + u32 mask; + u8 shift; +}; + +static inline struct mtk_clk_cpumux *to_clk_mux(struct clk_hw *_hw) +{ + return container_of(_hw, struct mtk_clk_cpumux, hw); +} + +static u8 clk_cpumux_get_parent(struct clk_hw *hw) +{ + struct mtk_clk_cpumux *mux = to_clk_mux(hw); + int num_parents = clk_hw_get_num_parents(hw); + unsigned int val; + + regmap_read(mux->regmap, mux->reg, &val); + + val >>= mux->shift; + val &= mux->mask; + + if (val >= num_parents) + return -EINVAL; + + return val; +} + +static int clk_cpumux_set_parent(struct clk_hw *hw, u8 index) +{ + struct mtk_clk_cpumux *mux = to_clk_mux(hw); + u32 mask, val; + + val = index << mux->shift; + mask = mux->mask << mux->shift; + + return regmap_update_bits(mux->regmap, mux->reg, mask, val); +} + +static const struct clk_ops clk_cpumux_ops = { + .get_parent = clk_cpumux_get_parent, + .set_parent = clk_cpumux_set_parent, +}; + +static struct clk __init *mtk_clk_register_cpumux(const struct mtk_composite *mux, + struct regmap *regmap) +{ + struct mtk_clk_cpumux *cpumux; + struct clk *clk; + struct clk_init_data init; + + cpumux = kzalloc(sizeof(*cpumux), GFP_KERNEL); + if (!cpumux) + return ERR_PTR(-ENOMEM); + + init.name = mux->name; + init.ops = &clk_cpumux_ops; + init.parent_names = mux->parent_names; + init.num_parents = mux->num_parents; + init.flags = mux->flags; + + cpumux->reg = mux->mux_reg; + cpumux->shift = mux->mux_shift; + cpumux->mask = BIT(mux->mux_width) - 1; + cpumux->regmap = regmap; + cpumux->hw.init = &init; + + clk = clk_register(NULL, &cpumux->hw); + if (IS_ERR(clk)) + kfree(cpumux); + + return clk; +} + +int __init mtk_clk_register_cpumuxes(struct device_node *node, + const struct mtk_composite *clks, int num, + struct clk_onecell_data *clk_data) +{ + int i; + struct clk *clk; + struct regmap *regmap; + + regmap = syscon_node_to_regmap(node); + if (IS_ERR(regmap)) { + pr_err("Cannot find regmap for %s: %ld\n", node->full_name, + PTR_ERR(regmap)); + return PTR_ERR(regmap); + } + + for (i = 0; i < num; i++) { + const struct mtk_composite *mux = &clks[i]; + + clk = mtk_clk_register_cpumux(mux, regmap); + if (IS_ERR(clk)) { + pr_err("Failed to register clk %s: %ld\n", + mux->name, PTR_ERR(clk)); + continue; + } + + clk_data->clks[mux->id] = clk; + } + + return 0; +} diff --git a/drivers/clk/mediatek/clk-cpumux.h b/drivers/clk/mediatek/clk-cpumux.h new file mode 100644 index 0000000..52c769f --- /dev/null +++ b/drivers/clk/mediatek/clk-cpumux.h @@ -0,0 +1,22 @@ +/* + * Copyright (c) 2015 Linaro Ltd. + * Author: Pi-Cheng Chen <pi-cheng.chen(a)linaro.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef __DRV_CLK_CPUMUX_H +#define __DRV_CLK_CPUMUX_H + +int mtk_clk_register_cpumuxes(struct device_node *node, + const struct mtk_composite *clks, int num, + struct clk_onecell_data *clk_data); + +#endif /* __DRV_CLK_CPUMUX_H */ diff --git a/drivers/clk/mediatek/clk-mt8173.c b/drivers/clk/mediatek/clk-mt8173.c index 9ea6aa1..b02d310 100644 --- a/drivers/clk/mediatek/clk-mt8173.c +++ b/drivers/clk/mediatek/clk-mt8173.c @@ -20,6 +20,7 @@ #include "clk-mtk.h" #include "clk-gate.h" +#include "clk-cpumux.h" #include <dt-bindings/clock/mt8173-clk.h> @@ -518,6 +519,25 @@ static const char * const i2s3_b_ck_parents[] __initconst = { "apll2_div5" }; +static const char * const ca53_parents[] __initconst = { + "clk26m", + "armca7pll", + "mainpll", + "univpll" +}; + +static const char * const ca57_parents[] __initconst = { + "clk26m", + "armca15pll", + "mainpll", + "univpll" +}; + +static const struct mtk_composite cpu_muxes[] __initconst = { + MUX(CLK_INFRA_CA53SEL, "infra_ca53_sel", ca53_parents, 0x0000, 0, 2), + MUX(CLK_INFRA_CA57SEL, "infra_ca57_sel", ca57_parents, 0x0000, 2, 2), +}; + static const struct mtk_composite top_muxes[] __initconst = { /* CLK_CFG_0 */ MUX(CLK_TOP_AXI_SEL, "axi_sel", axi_parents, 0x0040, 0, 3), @@ -760,6 +780,9 @@ static void __init mtk_infrasys_init(struct device_node *node) clk_data); mtk_clk_register_factors(infra_divs, ARRAY_SIZE(infra_divs), clk_data); + mtk_clk_register_cpumuxes(node, cpu_muxes, ARRAY_SIZE(cpu_muxes), + clk_data); + r = of_clk_add_provider(node, of_clk_src_onecell_get, clk_data); if (r) pr_err("%s(): could not register clock provider: %d\n", diff --git a/include/dt-bindings/clock/mt8173-clk.h b/include/dt-bindings/clock/mt8173-clk.h index fa2a2bb..a17cbaa 100644 --- a/include/dt-bindings/clock/mt8173-clk.h +++ b/include/dt-bindings/clock/mt8173-clk.h @@ -188,7 +188,9 @@ #define CLK_INFRA_PMICSPI 10 #define CLK_INFRA_PMICWRAP 11 #define CLK_INFRA_CLK_13M 12 -#define CLK_INFRA_NR_CLK 13 +#define CLK_INFRA_CA53SEL 13 +#define CLK_INFRA_CA57SEL 14 +#define CLK_INFRA_NR_CLK 15 /* PERI_SYS */ -- 1.9.1

7 years, 2 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 4.2-rc1 v21 0/6] irq/arm: Implement arch_trigger_all_cpu_backtrace

by Daniel Thompson

This patchset modifies the GIC driver to allow it, on supported platforms, to route IPI interrupts to FIQ. It then uses this feature to implement arch_trigger_all_cpu_backtrace for arm. In order to neatly deliver the changes for the arm we also rearrange some of the existing x86 NMI code to make it architecture neutral. The patches have been runtime tested on both a system capable of supporting FIQ (Freescale i.MX6) and one that cannot (Qualcomm Snapdragon 600). In addition older versions of this patchset have been tested on STiH416 and vexpress-a9. The changes to the x86 logic were tested using qemu. v21: * Change the way SGIs are raised to try to increase robustness starting secondary cores. This is a theoretic fix for a regression reported by Mark Rutland on vexpress-tc2 but it also allows us to remove igroup0_shadow entirely since it is no longer needed. * Fix a couple of variable names and add comments to describe the hardware behavior better (Mark Rutland). * Improved MULTI_IRQ_HANDLER support by clearing FIQs using handle_arch_irq (Marc Zygnier). * Fix gic_cpu_if_down() to ensure group 1 interrupts are disabled then the interface is brought down. For changes in v20 and earlier see: http://thread.gmane.org/gmane.linux.kernel/1928465 Daniel Thompson (6): irqchip: gic: Optimize locking in gic_raise_softirq irqchip: gic: Make gic_raise_softirq FIQ-safe irqchip: gic: Introduce plumbing for IPI FIQ printk: Simple implementation for NMI backtracing x86/nmi: Use common printk functions ARM: Add support for on-demand backtrace of other CPUs arch/arm/Kconfig | 1 + arch/arm/include/asm/hardirq.h | 2 +- arch/arm/include/asm/irq.h | 5 + arch/arm/include/asm/smp.h | 3 + arch/arm/kernel/smp.c | 82 +++++++++++++++ arch/arm/kernel/traps.c | 13 ++- arch/x86/Kconfig | 1 + arch/x86/kernel/apic/hw_nmi.c | 104 ++----------------- drivers/irqchip/irq-gic.c | 220 +++++++++++++++++++++++++++++++++++++--- include/linux/irqchip/arm-gic.h | 6 ++ include/linux/printk.h | 20 ++++ init/Kconfig | 3 + kernel/printk/Makefile | 1 + kernel/printk/nmi_backtrace.c | 147 +++++++++++++++++++++++++++ 14 files changed, 495 insertions(+), 113 deletions(-) create mode 100644 kernel/printk/nmi_backtrace.c -- 2.4.3

7 years, 8 months

[RESEND PATCH 0/3 v6] Add Mediatek MT8173 cpufreq driver

by Pi-Cheng Chen

MT8173 is a ARMv8 based SoC with 2 clusters. All CPUs in a single cluster share the same power and clock domain. This series tries to add cpufreq support for MT8173 SoC. The v6 of this series is resent with Acks added. changes in v6: - Move clock and regulator consumer properties document to the device tree bindings documents of MT8173 CPU DVFS clock driver - Add change log to describe what is implemented in the MT8173 cpufreq driver - Add missed rcu_read_unlock() in the error path - Move of_init_opp_table() call to make sure all required hardware resources are already there before it is called - Add comments to describe why both platform driver and deivce registration codes are put in the initcall function - Use the term "voltage tracking" instead of "voltage trace" according to an internal SoC document changes in v5: - Move resource allocation code from init() into probe() and remove some unused functions due to this change - Fix descriptions for device tree binding document - Address review comments for last version - Register CPU cooling device Changes in v4: - Add bindings for MT8173 cpufreq driver - Move OPP table back into device tree - Address comments for last version Changes in v3: - Implement MT8173 specific standalone cpufreq driver instead of using cpufreq-dt driver - Define OPP table in the driver source code until new OPP binding is ready Changes in v2: - Add intermediate frequency support in cpufreq-dt driver - Use voltage scaling code of cpufreq-dt for little cluster instead of implementaion in notifier of mtk-cpufreq driver - Code refinement for mtk-cpufreq driver Pi-Cheng Chen (3): dt-bindings: mediatek: Add MT8173 CPU DVFS clock bindings cpufreq: mediatek: Add MT8173 cpufreq driver arm64: dts: mt8173: Add mt8173 cpufreq driver support .../devicetree/bindings/clock/mt8173-cpu-dvfs.txt | 83 ++++ arch/arm64/boot/dts/mediatek/mt8173-evb.dts | 18 + arch/arm64/boot/dts/mediatek/mt8173.dtsi | 64 +++ drivers/cpufreq/Kconfig.arm | 7 + drivers/cpufreq/Makefile | 1 + drivers/cpufreq/mt8173-cpufreq.c | 524 +++++++++++++++++++++ 6 files changed, 697 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/mt8173-cpu-dvfs.txt create mode 100644 drivers/cpufreq/mt8173-cpufreq.c -- 1.9.1

8 years

[PATCH 0/7] CPUFreq: Minor cleanups

by Viresh Kumar

Hi Rafael, I was looking at cpufreq core this morning for some work and got these minor fixes on the way. Please see if they look good. -- viresh Viresh Kumar (7): cpufreq: remove redundant CPUFREQ_INCOMPATIBLE notifier event cpufreq: use memcpy() to copy policy cpufreq: update user_policy.* on success cpufreq: remove redundant 'governor' field from user_policy cpufreq: remove redundant 'policy' field from user_policy cpufreq: rename cpufreq_real_policy as cpufreq_user_policy cpufreq: drop !cpufreq_driver check from cpufreq_parse_governor() Documentation/cpu-freq/core.txt | 7 ++----- drivers/acpi/processor_perflib.c | 2 +- drivers/cpufreq/cpufreq.c | 31 +++---------------------------- drivers/cpufreq/ppc_cbe_cpufreq_pmi.c | 4 ++-- drivers/video/fbdev/pxafb.c | 1 - drivers/video/fbdev/sa1100fb.c | 1 - include/linux/cpufreq.h | 15 ++++++--------- 7 files changed, 14 insertions(+), 47 deletions(-) -- 2.4.0

8 years

[PATCH 00/16] PM / OPP: multiple regulators & opp-transition support

by Viresh Kumar

Hi Guys, This is rebased over following series that adds debugfs support to OPP core: http://marc.info/?i=cover.1441354424.git.viresh.kumar%40linaro.org This series extends V2 bindings support further to make it usable to most of the platforms. [1-2] update the bindings a bit to get them working for multiple regulators case. [3-4] cleanups. [5-7] Multiple regulator support [8-16] OPP transition support, so that the user drivers can directly ask to switch device to a particular OPP, instead of them dealing with the complexity of handling clocks and voltages. I have also got cpufreq-dt driver updated to work with the new bindings, but holded-off those changes to keep this series smaller. Those were another Nine patches. For curious developers/reviewers, all required code (debugfs, this and cpufreq-dt) is pushed to: https://git.linaro.org/people/viresh.kumar/linux.git opp/multi-regulator-v1 Please help in getting this reviewed :) Viresh Kumar (16): PM / OPP: Add 'supply-names' binding PM / OPP: Add 'opp-microvolt-triplets' binding PM / OPP: Improve debug print messages with pr_fmt PM / OPP: Rename routines specific to old bindings with _v1 PM / OPP: Parse all power-supply related bindings together PM / OPP: Create separate structure for regulator/supplies PM / OPP: Add multiple regulators support PM / OPP: get/put regulators from OPP core PM / OPP: Disable OPPs that aren't supported by the regulators PM / OPP: Introduce dev_pm_opp_get_max_volt_latency() PM / OPP: Introduce dev_pm_opp_get_max_transition_latency() PM / OPP: Parse clock and voltage tolerance for v1 bindings PM / OPP: Manage device clk as well PM / OPP: Add dev_pm_opp_set_regulator() to specify regulator PM / OPP: Add dev_pm_opp_set_rate() PM / OPP: don't print error message for deferred probing Documentation/devicetree/bindings/opp/opp.txt | 40 +- drivers/base/power/opp/core.c | 637 +++++++++++++++++++++++--- drivers/base/power/opp/cpu.c | 8 +- drivers/base/power/opp/debugfs.c | 52 ++- drivers/base/power/opp/opp.h | 44 +- include/linux/pm_opp.h | 25 + 6 files changed, 722 insertions(+), 84 deletions(-) -- 2.4.0

8 years, 1 month

[PATCH] sched/fair: update scale invariance of pelt

by Vincent Guittot

The current implementation of load tracking invariance scales the load tracking value with current frequency and uarch performance (only for utilization) of the CPU. One main result of the current formula is that the figures are capped by the current capacity of the CPU. This limitation is the main reason of not including the uarch invariance (arch_scale_cpu_capacity) in the calculation of load_avg because capping the load can generate erroneous system load statistic as described with this example [1] Instead of scaling the complete value of PELT algo, we should only scale the running time by the current capacity of the CPU. It seems more correct to only scale the running time because the non running time of a task (sleeping or waiting for a runqueue) is the same whatever the current freq and the compute capacity of the CPU. Then, one main advantage of this change is that the load of a task can reach max value whatever the current freq and the uarch of the CPU on which it run. It will just take more time at a lower freq than a max freq or on a "little" CPU compared to a "big" one. The load and the utilization stay invariant across system so we can still compared them between CPU but with a wider range of values. With this change, we don't have to test if a CPU is overloaded or not in order to use one metric (util) or another (load) as all metrics are always valid. I have put below some examples of duration to reach some typical load value according to the capacity of the CPU with current implementation and with this patch. Util (%) max capacity half capacity(mainline) half capacity(w/ patch) 972 (95%) 138ms not reachable 276ms 486 (47.5%) 30ms 138ms 60ms 256 (25%) 13ms 32ms 26ms We can see that at half capacity, we need twice the duration of max capacity with this patch whereas we have a non linear increase of the duration with current implementation. [1] https://lkml.org/lkml/2014/12/18/128 Signed-off-by: Vincent Guittot <vincent.guittot(a)linaro.org> --- kernel/sched/fair.c | 28 +++++++++++++--------------- 1 file changed, 13 insertions(+), 15 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 824aa9f..f2a18e1 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -2560,10 +2560,9 @@ static __always_inline int __update_load_avg(u64 now, int cpu, struct sched_avg *sa, unsigned long weight, int running, struct cfs_rq *cfs_rq) { - u64 delta, scaled_delta, periods; + u64 delta, periods; u32 contrib; - unsigned int delta_w, scaled_delta_w, decayed = 0; - unsigned long scale_freq, scale_cpu; + unsigned int delta_w, decayed = 0; delta = now - sa->last_update_time; /* @@ -2584,8 +2583,10 @@ __update_load_avg(u64 now, int cpu, struct sched_avg *sa, return 0; sa->last_update_time = now; - scale_freq = arch_scale_freq_capacity(NULL, cpu); - scale_cpu = arch_scale_cpu_capacity(NULL, cpu); + if (running) { + delta = cap_scale(delta, arch_scale_freq_capacity(NULL, cpu)); + delta = cap_scale(delta, arch_scale_cpu_capacity(NULL, cpu)); + } /* delta_w is the amount already accumulated against our next period */ delta_w = sa->period_contrib; @@ -2601,16 +2602,15 @@ __update_load_avg(u64 now, int cpu, struct sched_avg *sa, * period and accrue it. */ delta_w = 1024 - delta_w; - scaled_delta_w = cap_scale(delta_w, scale_freq); if (weight) { - sa->load_sum += weight * scaled_delta_w; + sa->load_sum += weight * delta_w; if (cfs_rq) { cfs_rq->runnable_load_sum += - weight * scaled_delta_w; + weight * delta_w; } } if (running) - sa->util_sum += scaled_delta_w * scale_cpu; + sa->util_sum += delta_w << SCHED_CAPACITY_SHIFT; delta -= delta_w; @@ -2627,25 +2627,23 @@ __update_load_avg(u64 now, int cpu, struct sched_avg *sa, /* Efficiently calculate \sum (1..n_period) 1024*y^i */ contrib = __compute_runnable_contrib(periods); - contrib = cap_scale(contrib, scale_freq); if (weight) { sa->load_sum += weight * contrib; if (cfs_rq) cfs_rq->runnable_load_sum += weight * contrib; } if (running) - sa->util_sum += contrib * scale_cpu; + sa->util_sum += contrib << SCHED_CAPACITY_SHIFT; } /* Remainder of delta accrued against u_0` */ - scaled_delta = cap_scale(delta, scale_freq); if (weight) { - sa->load_sum += weight * scaled_delta; + sa->load_sum += weight * delta; if (cfs_rq) - cfs_rq->runnable_load_sum += weight * scaled_delta; + cfs_rq->runnable_load_sum += weight * delta; } if (running) - sa->util_sum += scaled_delta * scale_cpu; + sa->util_sum += delta << SCHED_CAPACITY_SHIFT; sa->period_contrib += delta; -- 1.9.1

8 years, 4 months

[PATCH 1/4] cpufreq: mt8173: add CPUFREQ_HAVE_GOVERNOR_PER_POLICY flag

by Pi-Cheng Chen

Add CPUFREQ_HAVE_GOVERNOR_PER_POLICY to have individual set of tunables for each cluster of MT8173. Signed-off-by: Pi-Cheng Chen <pi-cheng.chen(a)linaro.org> --- drivers/cpufreq/mt8173-cpufreq.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/cpufreq/mt8173-cpufreq.c b/drivers/cpufreq/mt8173-cpufreq.c index 83001dc..c438109 100644 --- a/drivers/cpufreq/mt8173-cpufreq.c +++ b/drivers/cpufreq/mt8173-cpufreq.c @@ -469,7 +469,8 @@ static int mtk_cpufreq_exit(struct cpufreq_policy *policy) } static struct cpufreq_driver mt8173_cpufreq_driver = { - .flags = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK, + .flags = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK | + CPUFREQ_HAVE_GOVERNOR_PER_POLICY, .verify = cpufreq_generic_frequency_table_verify, .target_index = mtk_cpufreq_set_target, .get = cpufreq_generic_get, -- 1.9.1

8 years, 4 months

[PATCH V3 0/5] PM / OPP: opp-supported-hw and <prop>-name bindings

by Viresh Kumar

Hi Rafael, Rob only needs to Ack the modified 2/5 patch and then you can safely apply this series. The first patch enables us to select only a subset of OPPs from the bigger table, based on what version of the hardware we are running on. The second one enables us to select slightly different values for multiple properties, based on what kind of hardware they are running on. The third one removes an (unused) binding, which is replaced by the second patch with a better solution. The fourth patch is based on what Stephen suggested (and then reviewed) in the earlier series, and the 5th one updates the existing users of these bindings for it. V2->V3: - dropped turbo/suspend named properties - Applied all the Acks Viresh Kumar (5): PM / OPP: Add "opp-supported-hw" binding PM / OPP: Add {opp-microvolt|opp-microamp}-<name> binding PM / OPP: Remove 'operating-points-names' binding PM / OPP: Rename OPP nodes as opp@<opp-hz> ARM: dts: exynos4412: Rename OPP nodes as opp@<opp-hz> Documentation/devicetree/bindings/opp/opp.txt | 132 ++++++++++++++++++-------- arch/arm/boot/dts/exynos4412.dtsi | 28 +++--- 2 files changed, 107 insertions(+), 53 deletions(-) -- 2.6.2.198.g614a2ac

8 years, 4 months

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linaro-kernel November 2015