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authorNicolas Pitre <nicolas.pitre@linaro.org>2015-03-12 01:16:13 +0300
committerOlof Johansson <olof@lixom.net>2015-04-03 22:52:46 +0300
commitd3a875444ad8d5e64c5a932361ca579312e49801 (patch)
tree88910c6b2e5b8f35541fbc57a975197981ea8113 /arch/arm/common
parent824f25c1ccded5de2d3e18268b91cddccdad3868 (diff)
downloadlinux-d3a875444ad8d5e64c5a932361ca579312e49801.tar.xz
ARM: MCPM: move the algorithmic complexity to the core code
All backends are reimplementing a variation of the same CPU reference count handling. They are also responsible for driving the MCPM special low-level locking. This is needless duplication, involving algorithmic requirements that are not necessarily obvious to the uninitiated. And from past code review experience, those were all initially implemented badly. After 3 years, it is time to refactor as much common code to the core MCPM facility to make the backends as simple as possible. To avoid a flag day, the new scheme is introduced in parallel to the existing backend interface. When all backends are converted over, the compatibility interface could be removed. The new MCPM backend interface implements simpler methods addressing very platform specific tasks performed under lock protection while keeping the algorithmic complexity and race avoidance local to the core code. Signed-off-by: Nicolas Pitre <nico@linaro.org> Tested-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'arch/arm/common')
-rw-r--r--arch/arm/common/mcpm_entry.c202
1 files changed, 170 insertions, 32 deletions
diff --git a/arch/arm/common/mcpm_entry.c b/arch/arm/common/mcpm_entry.c
index 3c165fc2dce2..5f8a52ac7edf 100644
--- a/arch/arm/common/mcpm_entry.c
+++ b/arch/arm/common/mcpm_entry.c
@@ -55,22 +55,81 @@ bool mcpm_is_available(void)
return (platform_ops) ? true : false;
}
+/*
+ * We can't use regular spinlocks. In the switcher case, it is possible
+ * for an outbound CPU to call power_down() after its inbound counterpart
+ * is already live using the same logical CPU number which trips lockdep
+ * debugging.
+ */
+static arch_spinlock_t mcpm_lock = __ARCH_SPIN_LOCK_UNLOCKED;
+
+static int mcpm_cpu_use_count[MAX_NR_CLUSTERS][MAX_CPUS_PER_CLUSTER];
+
+static inline bool mcpm_cluster_unused(unsigned int cluster)
+{
+ int i, cnt;
+ for (i = 0, cnt = 0; i < MAX_CPUS_PER_CLUSTER; i++)
+ cnt |= mcpm_cpu_use_count[cluster][i];
+ return !cnt;
+}
+
int mcpm_cpu_power_up(unsigned int cpu, unsigned int cluster)
{
+ bool cpu_is_down, cluster_is_down;
+ int ret = 0;
+
if (!platform_ops)
return -EUNATCH; /* try not to shadow power_up errors */
might_sleep();
- return platform_ops->power_up(cpu, cluster);
+
+ /* backward compatibility callback */
+ if (platform_ops->power_up)
+ return platform_ops->power_up(cpu, cluster);
+
+ pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);
+
+ /*
+ * Since this is called with IRQs enabled, and no arch_spin_lock_irq
+ * variant exists, we need to disable IRQs manually here.
+ */
+ local_irq_disable();
+ arch_spin_lock(&mcpm_lock);
+
+ cpu_is_down = !mcpm_cpu_use_count[cluster][cpu];
+ cluster_is_down = mcpm_cluster_unused(cluster);
+
+ mcpm_cpu_use_count[cluster][cpu]++;
+ /*
+ * The only possible values are:
+ * 0 = CPU down
+ * 1 = CPU (still) up
+ * 2 = CPU requested to be up before it had a chance
+ * to actually make itself down.
+ * Any other value is a bug.
+ */
+ BUG_ON(mcpm_cpu_use_count[cluster][cpu] != 1 &&
+ mcpm_cpu_use_count[cluster][cpu] != 2);
+
+ if (cluster_is_down)
+ ret = platform_ops->cluster_powerup(cluster);
+ if (cpu_is_down && !ret)
+ ret = platform_ops->cpu_powerup(cpu, cluster);
+
+ arch_spin_unlock(&mcpm_lock);
+ local_irq_enable();
+ return ret;
}
typedef void (*phys_reset_t)(unsigned long);
void mcpm_cpu_power_down(void)
{
+ unsigned int mpidr, cpu, cluster;
+ bool cpu_going_down, last_man;
phys_reset_t phys_reset;
- if (WARN_ON_ONCE(!platform_ops || !platform_ops->power_down))
- return;
+ if (WARN_ON_ONCE(!platform_ops))
+ return;
BUG_ON(!irqs_disabled());
/*
@@ -79,28 +138,65 @@ void mcpm_cpu_power_down(void)
*/
setup_mm_for_reboot();
- platform_ops->power_down();
+ /* backward compatibility callback */
+ if (platform_ops->power_down) {
+ platform_ops->power_down();
+ goto not_dead;
+ }
+
+ mpidr = read_cpuid_mpidr();
+ cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+ cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+ pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);
+
+ __mcpm_cpu_going_down(cpu, cluster);
+ arch_spin_lock(&mcpm_lock);
+ BUG_ON(__mcpm_cluster_state(cluster) != CLUSTER_UP);
+
+ mcpm_cpu_use_count[cluster][cpu]--;
+ BUG_ON(mcpm_cpu_use_count[cluster][cpu] != 0 &&
+ mcpm_cpu_use_count[cluster][cpu] != 1);
+ cpu_going_down = !mcpm_cpu_use_count[cluster][cpu];
+ last_man = mcpm_cluster_unused(cluster);
+
+ if (last_man && __mcpm_outbound_enter_critical(cpu, cluster)) {
+ platform_ops->cpu_powerdown_prepare(cpu, cluster);
+ platform_ops->cluster_powerdown_prepare(cluster);
+ arch_spin_unlock(&mcpm_lock);
+ platform_ops->cluster_cache_disable();
+ __mcpm_outbound_leave_critical(cluster, CLUSTER_DOWN);
+ } else {
+ if (cpu_going_down)
+ platform_ops->cpu_powerdown_prepare(cpu, cluster);
+ arch_spin_unlock(&mcpm_lock);
+ /*
+ * If cpu_going_down is false here, that means a power_up
+ * request raced ahead of us. Even if we do not want to
+ * shut this CPU down, the caller still expects execution
+ * to return through the system resume entry path, like
+ * when the WFI is aborted due to a new IRQ or the like..
+ * So let's continue with cache cleaning in all cases.
+ */
+ platform_ops->cpu_cache_disable();
+ }
+
+ __mcpm_cpu_down(cpu, cluster);
+
+ /* Now we are prepared for power-down, do it: */
+ if (cpu_going_down)
+ wfi();
+
+not_dead:
/*
* It is possible for a power_up request to happen concurrently
* with a power_down request for the same CPU. In this case the
- * power_down method might not be able to actually enter a
- * powered down state with the WFI instruction if the power_up
- * method has removed the required reset condition. The
- * power_down method is then allowed to return. We must perform
- * a re-entry in the kernel as if the power_up method just had
- * deasserted reset on the CPU.
- *
- * To simplify race issues, the platform specific implementation
- * must accommodate for the possibility of unordered calls to
- * power_down and power_up with a usage count. Therefore, if a
- * call to power_up is issued for a CPU that is not down, then
- * the next call to power_down must not attempt a full shutdown
- * but only do the minimum (normally disabling L1 cache and CPU
- * coherency) and return just as if a concurrent power_up request
- * had happened as described above.
+ * CPU might not be able to actually enter a powered down state
+ * with the WFI instruction if the power_up request has removed
+ * the required reset condition. We must perform a re-entry in
+ * the kernel as if the power_up method just had deasserted reset
+ * on the CPU.
*/
-
phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
phys_reset(virt_to_phys(mcpm_entry_point));
@@ -125,26 +221,66 @@ int mcpm_wait_for_cpu_powerdown(unsigned int cpu, unsigned int cluster)
void mcpm_cpu_suspend(u64 expected_residency)
{
- phys_reset_t phys_reset;
-
- if (WARN_ON_ONCE(!platform_ops || !platform_ops->suspend))
+ if (WARN_ON_ONCE(!platform_ops))
return;
- BUG_ON(!irqs_disabled());
- /* Very similar to mcpm_cpu_power_down() */
- setup_mm_for_reboot();
- platform_ops->suspend(expected_residency);
- phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
- phys_reset(virt_to_phys(mcpm_entry_point));
- BUG();
+ /* backward compatibility callback */
+ if (platform_ops->suspend) {
+ phys_reset_t phys_reset;
+ BUG_ON(!irqs_disabled());
+ setup_mm_for_reboot();
+ platform_ops->suspend(expected_residency);
+ phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
+ phys_reset(virt_to_phys(mcpm_entry_point));
+ BUG();
+ }
+
+ /* Some platforms might have to enable special resume modes, etc. */
+ if (platform_ops->cpu_suspend_prepare) {
+ unsigned int mpidr = read_cpuid_mpidr();
+ unsigned int cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+ unsigned int cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+ arch_spin_lock(&mcpm_lock);
+ platform_ops->cpu_suspend_prepare(cpu, cluster);
+ arch_spin_unlock(&mcpm_lock);
+ }
+ mcpm_cpu_power_down();
}
int mcpm_cpu_powered_up(void)
{
+ unsigned int mpidr, cpu, cluster;
+ bool cpu_was_down, first_man;
+ unsigned long flags;
+
if (!platform_ops)
return -EUNATCH;
- if (platform_ops->powered_up)
+
+ /* backward compatibility callback */
+ if (platform_ops->powered_up) {
platform_ops->powered_up();
+ return 0;
+ }
+
+ mpidr = read_cpuid_mpidr();
+ cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+ cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+ local_irq_save(flags);
+ arch_spin_lock(&mcpm_lock);
+
+ cpu_was_down = !mcpm_cpu_use_count[cluster][cpu];
+ first_man = mcpm_cluster_unused(cluster);
+
+ if (first_man && platform_ops->cluster_is_up)
+ platform_ops->cluster_is_up(cluster);
+ if (cpu_was_down)
+ mcpm_cpu_use_count[cluster][cpu] = 1;
+ if (platform_ops->cpu_is_up)
+ platform_ops->cpu_is_up(cpu, cluster);
+
+ arch_spin_unlock(&mcpm_lock);
+ local_irq_restore(flags);
+
return 0;
}
@@ -334,8 +470,10 @@ int __init mcpm_sync_init(
}
mpidr = read_cpuid_mpidr();
this_cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
- for_each_online_cpu(i)
+ for_each_online_cpu(i) {
+ mcpm_cpu_use_count[this_cluster][i] = 1;
mcpm_sync.clusters[this_cluster].cpus[i].cpu = CPU_UP;
+ }
mcpm_sync.clusters[this_cluster].cluster = CLUSTER_UP;
sync_cache_w(&mcpm_sync);