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ARM: tegra: Setup CPU hotplug in a pure initcall 

CPU hotplug support doesn't have to be set up until fairly late in the
boot process, so it can be done in a regular initcall. To make sure that
we don't miss any ordering problems in the future, output a warning if
any of the functions are called before initialization has completed.

This is part of untangling the boot order dependencies on Tegra so that
more code can be shared between 32-bit and 64-bit ARM.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2014-07-11 11:00:37 +02:00
parent a2686766c8
commit 05ccf19602
3 changed files with 14 additions and 6 deletions
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16
arch/arm/mach-tegra/hotplug.c
View File

@ -12,6 +12,7 @@
#include <linux/kernel.h>
#include <linux/smp.h>
#include <soc/tegra/common.h>
#include <soc/tegra/fuse.h>
#include <asm/smp_plat.h>
@ -38,6 +39,11 @@ int tegra_cpu_kill(unsigned cpu)
*/
void __ref tegra_cpu_die(unsigned int cpu)
{
if (!tegra_hotplug_shutdown) {
WARN(1, "hotplug is not yet initialized\n");
return;
}
/* Clean L1 data cache */
tegra_disable_clean_inv_dcache(TEGRA_FLUSH_CACHE_LOUIS);
@ -48,10 +54,13 @@ void __ref tegra_cpu_die(unsigned int cpu)
BUG();
}
void __init tegra_hotplug_init(void)
static int __init tegra_hotplug_init(void)
{
if (!IS_ENABLED(CONFIG_HOTPLUG_CPU))
return;
return 0;
if (!soc_is_tegra())
return 0;
if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC) && tegra_get_chip_id() == TEGRA20)
tegra_hotplug_shutdown = tegra20_hotplug_shutdown;
@ -61,4 +70,7 @@ void __init tegra_hotplug_init(void)
tegra_hotplug_shutdown = tegra30_hotplug_shutdown;
if (IS_ENABLED(CONFIG_ARCH_TEGRA_124_SOC) && tegra_get_chip_id() == TEGRA124)
tegra_hotplug_shutdown = tegra30_hotplug_shutdown;
return 0;
}
pure_initcall(tegra_hotplug_init);

3
arch/arm/mach-tegra/sleep.h
View File

@ -130,9 +130,6 @@ void tegra_disable_clean_inv_dcache(u32 flag);
#ifdef CONFIG_HOTPLUG_CPU
void tegra20_hotplug_shutdown(void);
void tegra30_hotplug_shutdown(void);
void tegra_hotplug_init(void);
#else
static inline void tegra_hotplug_init(void) {}
#endif
void tegra20_cpu_shutdown(int cpu);

1
arch/arm/mach-tegra/tegra.c
View File

@ -76,7 +76,6 @@ static void __init tegra_init_early(void)
tegra_init_fuse();
tegra_cpu_reset_handler_init();
tegra_powergate_init();
tegra_hotplug_init();
}
static void __init tegra_dt_init_irq(void)