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| author | Phil Elwell <phil@raspberrypi.org> | 2017-08-08 12:04:55 +0100 |
|---|---|---|
| committer | Florian Fainelli <f.fainelli@gmail.com> | 2017-09-25 11:52:28 -0700 |
| commit | 968f76417df671338ea3a1fd33b2c93a048cc1b1 (patch) | |
| tree | d0dafb2ccc7787786d00713250ecfa30c44b2441 /arch/arm/mach-bcm | |
| parent | 88bbe85dcd37aa2662c1a83962c15009fc12503e (diff) | |
| download | lwn-968f76417df671338ea3a1fd33b2c93a048cc1b1.tar.gz lwn-968f76417df671338ea3a1fd33b2c93a048cc1b1.zip | |
ARM: bcm2836: Send event when onlining other cores
Secondary cores should enter a low-power idle state when waiting to
be started. The "wfe" instruction causes a core to wait until an event
or interrupt arrives before continuing to the next instruction, and
the "sev" instruction sends a wakeup event to the other cores.
Add an "sev" (and a memory barrier) to bcm2836_boot_secondary, the
function that wakes the waiting cores during booting. This is required
if the secondary cores are sitting in "wfe", and harmless if not.
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Eric Anholt <eric@anholt.net>
Diffstat (limited to 'arch/arm/mach-bcm')
| -rw-r--r-- | arch/arm/mach-bcm/platsmp.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/mach-bcm/platsmp.c b/arch/arm/mach-bcm/platsmp.c index 34506a608fea..7d954830eb57 100644 --- a/arch/arm/mach-bcm/platsmp.c +++ b/arch/arm/mach-bcm/platsmp.c @@ -312,6 +312,9 @@ static int bcm2836_boot_secondary(unsigned int cpu, struct task_struct *idle) writel(virt_to_phys(secondary_startup), intc_base + LOCAL_MAILBOX3_SET0 + 16 * cpu); + dsb(sy); + sev(); + iounmap(intc_base); return 0; |