mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-17 13:36:44 +07:00
4bde63286a
Fixes the following on allmodconfig build: profile.c:(.text+0x3e4): undefined reference to `setup_profiling_timer' Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
118 lines
2.4 KiB
C
118 lines
2.4 KiB
C
/*
|
|
* SMP initialisation and IPI support
|
|
* Based on arch/arm64/kernel/smp.c
|
|
*
|
|
* Copyright (C) 2012 ARM Ltd.
|
|
* Copyright (C) 2015 Regents of the University of California
|
|
* Copyright (C) 2017 SiFive
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <linux/interrupt.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/sched.h>
|
|
|
|
#include <asm/sbi.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/cacheflush.h>
|
|
|
|
/* A collection of single bit ipi messages. */
|
|
static struct {
|
|
unsigned long bits ____cacheline_aligned;
|
|
} ipi_data[NR_CPUS] __cacheline_aligned;
|
|
|
|
enum ipi_message_type {
|
|
IPI_RESCHEDULE,
|
|
IPI_CALL_FUNC,
|
|
IPI_MAX
|
|
};
|
|
|
|
|
|
/* Unsupported */
|
|
int setup_profiling_timer(unsigned int multiplier)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
irqreturn_t handle_ipi(void)
|
|
{
|
|
unsigned long *pending_ipis = &ipi_data[smp_processor_id()].bits;
|
|
|
|
/* Clear pending IPI */
|
|
csr_clear(sip, SIE_SSIE);
|
|
|
|
while (true) {
|
|
unsigned long ops;
|
|
|
|
/* Order bit clearing and data access. */
|
|
mb();
|
|
|
|
ops = xchg(pending_ipis, 0);
|
|
if (ops == 0)
|
|
return IRQ_HANDLED;
|
|
|
|
if (ops & (1 << IPI_RESCHEDULE))
|
|
scheduler_ipi();
|
|
|
|
if (ops & (1 << IPI_CALL_FUNC))
|
|
generic_smp_call_function_interrupt();
|
|
|
|
BUG_ON((ops >> IPI_MAX) != 0);
|
|
|
|
/* Order data access and bit testing. */
|
|
mb();
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void
|
|
send_ipi_message(const struct cpumask *to_whom, enum ipi_message_type operation)
|
|
{
|
|
int i;
|
|
|
|
mb();
|
|
for_each_cpu(i, to_whom)
|
|
set_bit(operation, &ipi_data[i].bits);
|
|
|
|
mb();
|
|
sbi_send_ipi(cpumask_bits(to_whom));
|
|
}
|
|
|
|
void arch_send_call_function_ipi_mask(struct cpumask *mask)
|
|
{
|
|
send_ipi_message(mask, IPI_CALL_FUNC);
|
|
}
|
|
|
|
void arch_send_call_function_single_ipi(int cpu)
|
|
{
|
|
send_ipi_message(cpumask_of(cpu), IPI_CALL_FUNC);
|
|
}
|
|
|
|
static void ipi_stop(void *unused)
|
|
{
|
|
while (1)
|
|
wait_for_interrupt();
|
|
}
|
|
|
|
void smp_send_stop(void)
|
|
{
|
|
on_each_cpu(ipi_stop, NULL, 1);
|
|
}
|
|
|
|
void smp_send_reschedule(int cpu)
|
|
{
|
|
send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE);
|
|
}
|