Release 4.14 arch/arm64/kernel/smp_spin_table.c
/*
* Spin Table SMP initialisation
*
* Copyright (C) 2013 ARM Ltd.
*
* 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/delay.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/smp.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <asm/cacheflush.h>
#include <asm/cpu_ops.h>
#include <asm/cputype.h>
#include <asm/io.h>
#include <asm/smp_plat.h>
extern void secondary_holding_pen(void);
volatile unsigned long __section(".mmuoff.data.read")
secondary_holding_pen_release = INVALID_HWID;
static phys_addr_t cpu_release_addr[NR_CPUS];
/*
* Write secondary_holding_pen_release in a way that is guaranteed to be
* visible to all observers, irrespective of whether they're taking part
* in coherency or not. This is necessary for the hotplug code to work
* reliably.
*/
static void write_pen_release(u64 val)
{
void *start = (void *)&secondary_holding_pen_release;
unsigned long size = sizeof(secondary_holding_pen_release);
secondary_holding_pen_release = val;
__flush_dcache_area(start, size);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mark Rutland | 40 | 100.00% | 1 | 100.00% |
| Total | 40 | 100.00% | 1 | 100.00% |
static int smp_spin_table_cpu_init(unsigned int cpu)
{
struct device_node *dn;
int ret;
dn = of_get_cpu_node(cpu, NULL);
if (!dn)
return -ENODEV;
/*
* Determine the address from which the CPU is polling.
*/
ret = of_property_read_u64(dn, "cpu-release-addr",
&cpu_release_addr[cpu]);
if (ret)
pr_err("CPU %d: missing or invalid cpu-release-addr property\n",
cpu);
of_node_put(dn);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marc Zyngier | 31 | 43.66% | 1 | 25.00% |
| Lorenzo Pieralisi | 23 | 32.39% | 1 | 25.00% |
| Masahiro Yamada | 15 | 21.13% | 1 | 25.00% |
| Mark Rutland | 2 | 2.82% | 1 | 25.00% |
| Total | 71 | 100.00% | 4 | 100.00% |
static int smp_spin_table_cpu_prepare(unsigned int cpu)
{
__le64 __iomem *release_addr;
if (!cpu_release_addr[cpu])
return -ENODEV;
/*
* The cpu-release-addr may or may not be inside the linear mapping.
* As ioremap_cache will either give us a new mapping or reuse the
* existing linear mapping, we can use it to cover both cases. In
* either case the memory will be MT_NORMAL.
*/
release_addr = ioremap_cache(cpu_release_addr[cpu],
sizeof(*release_addr));
if (!release_addr)
return -ENOMEM;
/*
* We write the release address as LE regardless of the native
* endianess of the kernel. Therefore, any boot-loaders that
* read this address need to convert this address to the
* boot-loader's endianess before jumping. This is mandated by
* the boot protocol.
*/
writeq_relaxed(__pa_symbol(secondary_holding_pen), release_addr);
__flush_dcache_area((__force void *)release_addr,
sizeof(*release_addr));
/*
* Send an event to wake up the secondary CPU.
*/
sev();
iounmap(release_addr);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marc Zyngier | 54 | 58.70% | 1 | 20.00% |
| Mark Rutland | 35 | 38.04% | 2 | 40.00% |
| Matthew Leach | 2 | 2.17% | 1 | 20.00% |
| Laura Abbott | 1 | 1.09% | 1 | 20.00% |
| Total | 92 | 100.00% | 5 | 100.00% |
static int smp_spin_table_cpu_boot(unsigned int cpu)
{
/*
* Update the pen release flag.
*/
write_pen_release(cpu_logical_map(cpu));
/*
* Send an event, causing the secondaries to read pen_release.
*/
sev();
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mark Rutland | 26 | 100.00% | 1 | 100.00% |
| Total | 26 | 100.00% | 1 | 100.00% |
const struct cpu_operations smp_spin_table_ops = {
.name = "spin-table",
.cpu_init = smp_spin_table_cpu_init,
.cpu_prepare = smp_spin_table_cpu_prepare,
.cpu_boot = smp_spin_table_cpu_boot,
};
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mark Rutland | 143 | 45.25% | 3 | 30.00% |
| Marc Zyngier | 122 | 38.61% | 1 | 10.00% |
| Lorenzo Pieralisi | 23 | 7.28% | 1 | 10.00% |
| Masahiro Yamada | 15 | 4.75% | 1 | 10.00% |
| Laura Abbott | 4 | 1.27% | 1 | 10.00% |
| James Morse | 4 | 1.27% | 1 | 10.00% |
| Paul Walmsley | 3 | 0.95% | 1 | 10.00% |
| Matthew Leach | 2 | 0.63% | 1 | 10.00% |
| Total | 316 | 100.00% | 10 | 100.00% |
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