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4603f53a1d
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
are flagged as __cpuinit -- so if we remove the __cpuinit from
arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
content into no-ops as early as possible, since that will get rid
of these warnings. In any case, they are temporary and harmless.
This removes all the arch/sh uses of the __cpuinit macros from
all C files. Currently sh does not have any __CPUINIT used in
assembly files.
[1] https://lkml.org/lkml/2013/5/20/589
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: linux-sh@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
167 lines
3.9 KiB
C
167 lines
3.9 KiB
C
/*
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* SH-X3 SMP
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*
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* Copyright (C) 2007 - 2010 Paul Mundt
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* Copyright (C) 2007 Magnus Damm
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/cpumask.h>
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#include <linux/smp.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <linux/cpu.h>
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#include <asm/sections.h>
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#define STBCR_REG(phys_id) (0xfe400004 | (phys_id << 12))
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#define RESET_REG(phys_id) (0xfe400008 | (phys_id << 12))
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#define STBCR_MSTP 0x00000001
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#define STBCR_RESET 0x00000002
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#define STBCR_SLEEP 0x00000004
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#define STBCR_LTSLP 0x80000000
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static irqreturn_t ipi_interrupt_handler(int irq, void *arg)
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{
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unsigned int message = (unsigned int)(long)arg;
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unsigned int cpu = hard_smp_processor_id();
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unsigned int offs = 4 * cpu;
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unsigned int x;
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x = __raw_readl(0xfe410070 + offs); /* C0INITICI..CnINTICI */
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x &= (1 << (message << 2));
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__raw_writel(x, 0xfe410080 + offs); /* C0INTICICLR..CnINTICICLR */
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smp_message_recv(message);
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return IRQ_HANDLED;
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}
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static void shx3_smp_setup(void)
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{
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unsigned int cpu = 0;
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int i, num;
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init_cpu_possible(cpumask_of(cpu));
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/* Enable light sleep for the boot CPU */
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__raw_writel(__raw_readl(STBCR_REG(cpu)) | STBCR_LTSLP, STBCR_REG(cpu));
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__cpu_number_map[0] = 0;
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__cpu_logical_map[0] = 0;
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/*
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* Do this stupidly for now.. we don't have an easy way to probe
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* for the total number of cores.
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*/
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for (i = 1, num = 0; i < NR_CPUS; i++) {
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set_cpu_possible(i, true);
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__cpu_number_map[i] = ++num;
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__cpu_logical_map[num] = i;
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}
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printk(KERN_INFO "Detected %i available secondary CPU(s)\n", num);
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}
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static void shx3_prepare_cpus(unsigned int max_cpus)
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{
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int i;
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local_timer_setup(0);
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BUILD_BUG_ON(SMP_MSG_NR >= 8);
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for (i = 0; i < SMP_MSG_NR; i++)
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request_irq(104 + i, ipi_interrupt_handler,
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IRQF_PERCPU, "IPI", (void *)(long)i);
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for (i = 0; i < max_cpus; i++)
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set_cpu_present(i, true);
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}
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static void shx3_start_cpu(unsigned int cpu, unsigned long entry_point)
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{
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if (__in_29bit_mode())
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__raw_writel(entry_point, RESET_REG(cpu));
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else
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__raw_writel(virt_to_phys(entry_point), RESET_REG(cpu));
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if (!(__raw_readl(STBCR_REG(cpu)) & STBCR_MSTP))
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__raw_writel(STBCR_MSTP, STBCR_REG(cpu));
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while (!(__raw_readl(STBCR_REG(cpu)) & STBCR_MSTP))
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cpu_relax();
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/* Start up secondary processor by sending a reset */
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__raw_writel(STBCR_RESET | STBCR_LTSLP, STBCR_REG(cpu));
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}
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static unsigned int shx3_smp_processor_id(void)
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{
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return __raw_readl(0xff000048); /* CPIDR */
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}
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static void shx3_send_ipi(unsigned int cpu, unsigned int message)
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{
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unsigned long addr = 0xfe410070 + (cpu * 4);
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BUG_ON(cpu >= 4);
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__raw_writel(1 << (message << 2), addr); /* C0INTICI..CnINTICI */
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}
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static void shx3_update_boot_vector(unsigned int cpu)
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{
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__raw_writel(STBCR_MSTP, STBCR_REG(cpu));
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while (!(__raw_readl(STBCR_REG(cpu)) & STBCR_MSTP))
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cpu_relax();
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__raw_writel(STBCR_RESET, STBCR_REG(cpu));
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}
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static int
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shx3_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
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{
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unsigned int cpu = (unsigned int)hcpu;
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switch (action) {
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case CPU_UP_PREPARE:
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shx3_update_boot_vector(cpu);
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break;
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case CPU_ONLINE:
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pr_info("CPU %u is now online\n", cpu);
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break;
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case CPU_DEAD:
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break;
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}
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return NOTIFY_OK;
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}
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static struct notifier_block shx3_cpu_notifier = {
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.notifier_call = shx3_cpu_callback,
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};
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static int register_shx3_cpu_notifier(void)
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{
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register_hotcpu_notifier(&shx3_cpu_notifier);
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return 0;
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}
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late_initcall(register_shx3_cpu_notifier);
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struct plat_smp_ops shx3_smp_ops = {
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.smp_setup = shx3_smp_setup,
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.prepare_cpus = shx3_prepare_cpus,
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.start_cpu = shx3_start_cpu,
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.smp_processor_id = shx3_smp_processor_id,
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.send_ipi = shx3_send_ipi,
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.cpu_die = native_cpu_die,
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.cpu_disable = native_cpu_disable,
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.play_dead = native_play_dead,
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};
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