summaryrefslogtreecommitdiff
path: root/arch/arm64/kernel/smp.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm64/kernel/smp.c')
-rw-r--r--arch/arm64/kernel/smp.c115
1 files changed, 98 insertions, 17 deletions
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index bdd34597254..5d54e3717bf 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -43,6 +43,7 @@
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/processor.h>
+#include <asm/smp_plat.h>
#include <asm/sections.h>
#include <asm/tlbflush.h>
#include <asm/ptrace.h>
@@ -53,7 +54,7 @@
* where to place its SVC stack
*/
struct secondary_data secondary_data;
-volatile unsigned long secondary_holding_pen_release = -1;
+volatile unsigned long secondary_holding_pen_release = INVALID_HWID;
enum ipi_msg_type {
IPI_RESCHEDULE,
@@ -70,7 +71,7 @@ static DEFINE_RAW_SPINLOCK(boot_lock);
* in coherency or not. This is necessary for the hotplug code to work
* reliably.
*/
-static void __cpuinit write_pen_release(int val)
+static void __cpuinit write_pen_release(u64 val)
{
void *start = (void *)&secondary_holding_pen_release;
unsigned long size = sizeof(secondary_holding_pen_release);
@@ -96,7 +97,7 @@ static int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
/*
* Update the pen release flag.
*/
- write_pen_release(cpu);
+ write_pen_release(cpu_logical_map(cpu));
/*
* Send an event, causing the secondaries to read pen_release.
@@ -105,7 +106,7 @@ static int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
timeout = jiffies + (1 * HZ);
while (time_before(jiffies, timeout)) {
- if (secondary_holding_pen_release == -1UL)
+ if (secondary_holding_pen_release == INVALID_HWID)
break;
udelay(10);
}
@@ -116,7 +117,7 @@ static int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
*/
raw_spin_unlock(&boot_lock);
- return secondary_holding_pen_release != -1 ? -ENOSYS : 0;
+ return secondary_holding_pen_release != INVALID_HWID ? -ENOSYS : 0;
}
static DECLARE_COMPLETION(cpu_running);
@@ -190,7 +191,7 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
* Let the primary processor know we're out of the
* pen, then head off into the C entry point
*/
- write_pen_release(-1);
+ write_pen_release(INVALID_HWID);
/*
* Synchronise with the boot thread.
@@ -216,7 +217,7 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
/*
* OK, it's off to the idle thread for us
*/
- cpu_idle();
+ cpu_startup_entry(CPUHP_ONLINE);
}
void __init smp_cpus_done(unsigned int max_cpus)
@@ -244,11 +245,11 @@ static const struct smp_enable_ops *smp_enable_ops[NR_CPUS];
static const struct smp_enable_ops * __init smp_get_enable_ops(const char *name)
{
- const struct smp_enable_ops *ops = enable_ops[0];
+ const struct smp_enable_ops **ops = enable_ops;
- while (ops) {
- if (!strcmp(name, ops->name))
- return ops;
+ while (*ops) {
+ if (!strcmp(name, (*ops)->name))
+ return *ops;
ops++;
}
@@ -257,15 +258,80 @@ static const struct smp_enable_ops * __init smp_get_enable_ops(const char *name)
}
/*
- * Enumerate the possible CPU set from the device tree.
+ * Enumerate the possible CPU set from the device tree and build the
+ * cpu logical map array containing MPIDR values related to logical
+ * cpus. Assumes that cpu_logical_map(0) has already been initialized.
*/
void __init smp_init_cpus(void)
{
const char *enable_method;
struct device_node *dn = NULL;
- int cpu = 0;
+ int i, cpu = 1;
+ bool bootcpu_valid = false;
while ((dn = of_find_node_by_type(dn, "cpu"))) {
+ const u32 *cell;
+ u64 hwid;
+
+ /*
+ * A cpu node with missing "reg" property is
+ * considered invalid to build a cpu_logical_map
+ * entry.
+ */
+ cell = of_get_property(dn, "reg", NULL);
+ if (!cell) {
+ pr_err("%s: missing reg property\n", dn->full_name);
+ goto next;
+ }
+ hwid = of_read_number(cell, of_n_addr_cells(dn));
+
+ /*
+ * Non affinity bits must be set to 0 in the DT
+ */
+ if (hwid & ~MPIDR_HWID_BITMASK) {
+ pr_err("%s: invalid reg property\n", dn->full_name);
+ goto next;
+ }
+
+ /*
+ * Duplicate MPIDRs are a recipe for disaster. Scan
+ * all initialized entries and check for
+ * duplicates. If any is found just ignore the cpu.
+ * cpu_logical_map was initialized to INVALID_HWID to
+ * avoid matching valid MPIDR values.
+ */
+ for (i = 1; (i < cpu) && (i < NR_CPUS); i++) {
+ if (cpu_logical_map(i) == hwid) {
+ pr_err("%s: duplicate cpu reg properties in the DT\n",
+ dn->full_name);
+ goto next;
+ }
+ }
+
+ /*
+ * The numbering scheme requires that the boot CPU
+ * must be assigned logical id 0. Record it so that
+ * the logical map built from DT is validated and can
+ * be used.
+ */
+ if (hwid == cpu_logical_map(0)) {
+ if (bootcpu_valid) {
+ pr_err("%s: duplicate boot cpu reg property in DT\n",
+ dn->full_name);
+ goto next;
+ }
+
+ bootcpu_valid = true;
+
+ /*
+ * cpu_logical_map has already been
+ * initialized and the boot cpu doesn't need
+ * the enable-method so continue without
+ * incrementing cpu.
+ */
+ continue;
+ }
+
if (cpu >= NR_CPUS)
goto next;
@@ -274,22 +340,24 @@ void __init smp_init_cpus(void)
*/
enable_method = of_get_property(dn, "enable-method", NULL);
if (!enable_method) {
- pr_err("CPU %d: missing enable-method property\n", cpu);
+ pr_err("%s: missing enable-method property\n",
+ dn->full_name);
goto next;
}
smp_enable_ops[cpu] = smp_get_enable_ops(enable_method);
if (!smp_enable_ops[cpu]) {
- pr_err("CPU %d: invalid enable-method property: %s\n",
- cpu, enable_method);
+ pr_err("%s: invalid enable-method property: %s\n",
+ dn->full_name, enable_method);
goto next;
}
if (smp_enable_ops[cpu]->init_cpu(dn, cpu))
goto next;
- set_cpu_possible(cpu, true);
+ pr_debug("cpu logical map 0x%llx\n", hwid);
+ cpu_logical_map(cpu) = hwid;
next:
cpu++;
}
@@ -298,6 +366,19 @@ next:
if (cpu > NR_CPUS)
pr_warning("no. of cores (%d) greater than configured maximum of %d - clipping\n",
cpu, NR_CPUS);
+
+ if (!bootcpu_valid) {
+ pr_err("DT missing boot CPU MPIDR, not enabling secondaries\n");
+ return;
+ }
+
+ /*
+ * All the cpus that made it to the cpu_logical_map have been
+ * validated so set them as possible cpus.
+ */
+ for (i = 0; i < NR_CPUS; i++)
+ if (cpu_logical_map(i) != INVALID_HWID)
+ set_cpu_possible(i, true);
}
void __init smp_prepare_cpus(unsigned int max_cpus)
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-11-04 11:01:53 +0000