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PD#SWPL-17246 Problem: sync the code from mainline. Solution: sync the code from mainline. 7c03859983c2 OSS vulnerability found in [boot.img]:[linux_kernel] (CVE-2018-12232) Risk:[] [1/1] ba89a3d9c791 OSS vulnerability found in [boot.img]:[linux_kernel] (CVE-2019-8912) Risk:[] [1/1] c434d0530610 Android Security Bulletin - November 2019-11 - Kernel components binder driver - CVE-2019-2214 [1/1] ff8d9012fbd4 Android Security Bulletin - November 2019-11 - Kernel components ext4 filesystem - CVE-2019-11833 [1/1] 3c52e964495e cec: store msg after bootup from st [1/2] 94198a56ee10 lcd: support tcon vac and demura data [2/2] 1add1a008a03 vout: spi: porting lcd driver and SPI to Linux [1/1] 3e8d7b0e5f97 hdmirx: add hpd recovery logic when input clk is unstable [1/1] f92e7ba21c62 ppmgr: Add 10bit, dolby and HDR video rotation. [1/1] dab2cc37cd95 dvb: fix dmx2 interrupt bug [1/1] 9d31efae4a55 dv: add dv target output mode [1/1] e86eb9d1b5c5 hdmirx: add rx phy tdr enable control [1/1] 8ea66f645bf6 dts: enable spi for gva [1/1] baf6e74528ef drm: add drm support for tm2 [1/1] Verify: verify by newton Change-Id: I9415060a4b39895b5d624117271a72fc6a1fd187 Signed-off-by: Luan Yuan <luan.yuan@amlogic.com>
119 lines
3.2 KiB
C
119 lines
3.2 KiB
C
/*
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* NMI backtrace support
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*
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* Gratuitously copied from arch/x86/kernel/apic/hw_nmi.c by Russell King,
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* with the following header:
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*
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* HW NMI watchdog support
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*
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* started by Don Zickus, Copyright (C) 2010 Red Hat, Inc.
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*
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* Arch specific calls to support NMI watchdog
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*
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* Bits copied from original nmi.c file
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*/
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#include <linux/cpumask.h>
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#include <linux/delay.h>
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#include <linux/kprobes.h>
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#include <linux/nmi.h>
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#include <linux/cpu.h>
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#ifdef arch_trigger_cpumask_backtrace
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/* For reliability, we're prepared to waste bits here. */
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static DECLARE_BITMAP(backtrace_mask, NR_CPUS) __read_mostly;
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/* "in progress" flag of arch_trigger_cpumask_backtrace */
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static unsigned long backtrace_flag;
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/*
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* When raise() is called it will be passed a pointer to the
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* backtrace_mask. Architectures that call nmi_cpu_backtrace()
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* directly from their raise() functions may rely on the mask
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* they are passed being updated as a side effect of this call.
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*/
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void nmi_trigger_cpumask_backtrace(const cpumask_t *mask,
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bool exclude_self,
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void (*raise)(cpumask_t *mask))
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{
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int i, this_cpu = get_cpu();
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if (test_and_set_bit(0, &backtrace_flag)) {
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/*
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* If there is already a trigger_all_cpu_backtrace() in progress
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* (backtrace_flag == 1), don't output double cpu dump infos.
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*/
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put_cpu();
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return;
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}
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cpumask_copy(to_cpumask(backtrace_mask), mask);
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if (exclude_self)
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cpumask_clear_cpu(this_cpu, to_cpumask(backtrace_mask));
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/*
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* Don't try to send an NMI to this cpu; it may work on some
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* architectures, but on others it may not, and we'll get
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* information at least as useful just by doing a dump_stack() here.
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* Note that nmi_cpu_backtrace(NULL) will clear the cpu bit.
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*/
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if (cpumask_test_cpu(this_cpu, to_cpumask(backtrace_mask)))
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nmi_cpu_backtrace(NULL);
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if (!cpumask_empty(to_cpumask(backtrace_mask))) {
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pr_info("Sending NMI from CPU %d to CPUs %*pbl:\n",
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this_cpu, nr_cpumask_bits, to_cpumask(backtrace_mask));
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raise(to_cpumask(backtrace_mask));
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}
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/* Wait for up to 10 seconds for all CPUs to do the backtrace */
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for (i = 0; i < 10 * 1000; i++) {
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if (cpumask_empty(to_cpumask(backtrace_mask)))
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break;
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mdelay(1);
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touch_softlockup_watchdog();
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}
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/*
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* Force flush any remote buffers that might be stuck in IRQ context
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* and therefore could not run their irq_work.
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*/
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printk_nmi_flush();
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clear_bit_unlock(0, &backtrace_flag);
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put_cpu();
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}
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bool nmi_cpu_backtrace(struct pt_regs *regs)
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{
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int cpu = smp_processor_id();
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if (cpumask_test_cpu(cpu, to_cpumask(backtrace_mask))) {
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if (regs && cpu_in_idle(instruction_pointer(regs))) {
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pr_warn("NMI backtrace for cpu %d skipped: idling at pc %#lx\n",
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cpu, instruction_pointer(regs));
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} else {
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pr_warn("NMI backtrace for cpu %d\n", cpu);
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/*
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* two reasons for not calling show_regs here
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* 1. two many logs(100 lines per second) are
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* introduced, which makes the wanted stack
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* infos missed
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* 2. leads to potential external abort on
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* non-linefetch issue
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*/
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#ifndef CONFIG_AMLOGIC_MODIFY
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if (regs)
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show_regs(regs);
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else
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#endif
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dump_stack();
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}
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cpumask_clear_cpu(cpu, to_cpumask(backtrace_mask));
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return true;
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}
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return false;
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}
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NOKPROBE_SYMBOL(nmi_cpu_backtrace);
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#endif
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