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powerpc/64: Use array of paca pointers and allocate pacas individually

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Change the paca array into an array of pointers to pacas. Allocate
pacas individually.

This allows flexibility in where the PACAs are allocated. Future work
will allocate them node-local. Platforms that don't have address limits
on PACAs would be able to defer PACA allocations until later in boot
rather than allocate all possible ones up-front then freeing unused.

This is slightly more overhead (one additional indirection) for cross
CPU paca references, but those aren't too common.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin
2018-02-14 01:08:12 +10:00
committed by Michael Ellerman
parent 8e0b634b13
commit d2e60075a3
26 changed files with 141 additions and 105 deletions
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4
arch/powerpc/platforms/pseries/smp.c
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@@ -110,7 +110,7 @@ static inline int smp_startup_cpu(unsigned int lcpu)
}
/* Fixup atomic count: it exited inside IRQ handler. */
task_thread_info(paca[lcpu].__current)->preempt_count = 0;
task_thread_info(paca_ptrs[lcpu]->__current)->preempt_count = 0;
#ifdef CONFIG_HOTPLUG_CPU
if (get_cpu_current_state(lcpu) == CPU_STATE_INACTIVE)
goto out;
@@ -165,7 +165,7 @@ static int smp_pSeries_kick_cpu(int nr)
* cpu_start field to become non-zero After we set cpu_start,
* the processor will continue on to secondary_start
*/
paca[nr].cpu_start = 1;
paca_ptrs[nr]->cpu_start = 1;
#ifdef CONFIG_HOTPLUG_CPU
set_preferred_offline_state(nr, CPU_STATE_ONLINE);