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-rw-r--r--arch/powerpc/platforms/85xx/smp.c312
1 files changed, 153 insertions, 159 deletions
diff --git a/arch/powerpc/platforms/85xx/smp.c b/arch/powerpc/platforms/85xx/smp.c
index 6b107cea1c08..fe9f19e5e935 100644
--- a/arch/powerpc/platforms/85xx/smp.c
+++ b/arch/powerpc/platforms/85xx/smp.c
@@ -2,7 +2,7 @@
* Author: Andy Fleming <afleming@freescale.com>
* Kumar Gala <galak@kernel.crashing.org>
*
- * Copyright 2006-2008, 2011-2012 Freescale Semiconductor Inc.
+ * Copyright 2006-2008, 2011-2012, 2015 Freescale Semiconductor Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
@@ -15,7 +15,6 @@
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/of.h>
-#include <linux/of_address.h>
#include <linux/kexec.h>
#include <linux/highmem.h>
#include <linux/cpu.h>
@@ -29,6 +28,7 @@
#include <asm/dbell.h>
#include <asm/code-patching.h>
#include <asm/cputhreads.h>
+#include <asm/fsl_pm.h>
#include <sysdev/fsl_soc.h>
#include <sysdev/mpic.h>
@@ -43,35 +43,23 @@ struct epapr_spin_table {
u32 pir;
};
-static struct ccsr_guts __iomem *guts;
+#ifdef CONFIG_HOTPLUG_CPU
static u64 timebase;
static int tb_req;
static int tb_valid;
-static void mpc85xx_timebase_freeze(int freeze)
-{
- uint32_t mask;
-
- mask = CCSR_GUTS_DEVDISR_TB0 | CCSR_GUTS_DEVDISR_TB1;
- if (freeze)
- setbits32(&guts->devdisr, mask);
- else
- clrbits32(&guts->devdisr, mask);
-
- in_be32(&guts->devdisr);
-}
-
static void mpc85xx_give_timebase(void)
{
unsigned long flags;
local_irq_save(flags);
+ hard_irq_disable();
while (!tb_req)
barrier();
tb_req = 0;
- mpc85xx_timebase_freeze(1);
+ qoriq_pm_ops->freeze_time_base(true);
#ifdef CONFIG_PPC64
/*
* e5500/e6500 have a workaround for erratum A-006958 in place
@@ -104,7 +92,7 @@ static void mpc85xx_give_timebase(void)
while (tb_valid)
barrier();
- mpc85xx_timebase_freeze(0);
+ qoriq_pm_ops->freeze_time_base(false);
local_irq_restore(flags);
}
@@ -114,6 +102,7 @@ static void mpc85xx_take_timebase(void)
unsigned long flags;
local_irq_save(flags);
+ hard_irq_disable();
tb_req = 1;
while (!tb_valid)
@@ -126,36 +115,54 @@ static void mpc85xx_take_timebase(void)
local_irq_restore(flags);
}
-#ifdef CONFIG_HOTPLUG_CPU
static void smp_85xx_mach_cpu_die(void)
{
unsigned int cpu = smp_processor_id();
- u32 tmp;
local_irq_disable();
+ hard_irq_disable();
+ /* mask all irqs to prevent cpu wakeup */
+ qoriq_pm_ops->irq_mask(cpu);
+
idle_task_exit();
- generic_set_cpu_dead(cpu);
- mb();
mtspr(SPRN_TCR, 0);
+ mtspr(SPRN_TSR, mfspr(SPRN_TSR));
- __flush_disable_L1();
- tmp = (mfspr(SPRN_HID0) & ~(HID0_DOZE|HID0_SLEEP)) | HID0_NAP;
- mtspr(SPRN_HID0, tmp);
- isync();
+ generic_set_cpu_dead(cpu);
- /* Enter NAP mode. */
- tmp = mfmsr();
- tmp |= MSR_WE;
- mb();
- mtmsr(tmp);
- isync();
+ cur_cpu_spec->cpu_down_flush();
+
+ qoriq_pm_ops->cpu_die(cpu);
while (1)
;
}
+
+static void qoriq_cpu_kill(unsigned int cpu)
+{
+ int i;
+
+ for (i = 0; i < 500; i++) {
+ if (is_cpu_dead(cpu)) {
+#ifdef CONFIG_PPC64
+ paca[cpu].cpu_start = 0;
+#endif
+ return;
+ }
+ msleep(20);
+ }
+ pr_err("CPU%d didn't die...\n", cpu);
+}
#endif
+/*
+ * To keep it compatible with old boot program which uses
+ * cache-inhibit spin table, we need to flush the cache
+ * before accessing spin table to invalidate any staled data.
+ * We also need to flush the cache after writing to spin
+ * table to push data out.
+ */
static inline void flush_spin_table(void *spin_table)
{
flush_dcache_range((ulong)spin_table,
@@ -173,78 +180,28 @@ static inline u32 read_spin_table_addr_l(void *spin_table)
static void wake_hw_thread(void *info)
{
void fsl_secondary_thread_init(void);
- unsigned long imsr, inia;
- int nr = *(const int *)info;
+ unsigned long inia;
+ int cpu = *(const int *)info;
- imsr = MSR_KERNEL;
inia = *(unsigned long *)fsl_secondary_thread_init;
-
- if (cpu_thread_in_core(nr) == 0) {
- /* For when we boot on a secondary thread with kdump */
- mttmr(TMRN_IMSR0, imsr);
- mttmr(TMRN_INIA0, inia);
- mtspr(SPRN_TENS, TEN_THREAD(0));
- } else {
- mttmr(TMRN_IMSR1, imsr);
- mttmr(TMRN_INIA1, inia);
- mtspr(SPRN_TENS, TEN_THREAD(1));
- }
-
- smp_generic_kick_cpu(nr);
+ book3e_start_thread(cpu_thread_in_core(cpu), inia);
}
#endif
-static int smp_85xx_kick_cpu(int nr)
+static int smp_85xx_start_cpu(int cpu)
{
- unsigned long flags;
- const u64 *cpu_rel_addr;
- __iomem struct epapr_spin_table *spin_table;
+ int ret = 0;
struct device_node *np;
- int hw_cpu = get_hard_smp_processor_id(nr);
+ const u64 *cpu_rel_addr;
+ unsigned long flags;
int ioremappable;
- int ret = 0;
-
- WARN_ON(nr < 0 || nr >= NR_CPUS);
- WARN_ON(hw_cpu < 0 || hw_cpu >= NR_CPUS);
-
- pr_debug("smp_85xx_kick_cpu: kick CPU #%d\n", nr);
-
-#ifdef CONFIG_PPC64
- /* Threads don't use the spin table */
- if (cpu_thread_in_core(nr) != 0) {
- int primary = cpu_first_thread_sibling(nr);
-
- if (WARN_ON_ONCE(!cpu_has_feature(CPU_FTR_SMT)))
- return -ENOENT;
-
- if (cpu_thread_in_core(nr) != 1) {
- pr_err("%s: cpu %d: invalid hw thread %d\n",
- __func__, nr, cpu_thread_in_core(nr));
- return -ENOENT;
- }
+ int hw_cpu = get_hard_smp_processor_id(cpu);
+ struct epapr_spin_table __iomem *spin_table;
- if (!cpu_online(primary)) {
- pr_err("%s: cpu %d: primary %d not online\n",
- __func__, nr, primary);
- return -ENOENT;
- }
-
- smp_call_function_single(primary, wake_hw_thread, &nr, 0);
- return 0;
- } else if (cpu_thread_in_core(boot_cpuid) != 0 &&
- cpu_first_thread_sibling(boot_cpuid) == nr) {
- if (WARN_ON_ONCE(!cpu_has_feature(CPU_FTR_SMT)))
- return -ENOENT;
-
- smp_call_function_single(boot_cpuid, wake_hw_thread, &nr, 0);
- }
-#endif
-
- np = of_get_cpu_node(nr, NULL);
+ np = of_get_cpu_node(cpu, NULL);
cpu_rel_addr = of_get_property(np, "cpu-release-addr", NULL);
-
- if (cpu_rel_addr == NULL) {
- printk(KERN_ERR "No cpu-release-addr for cpu %d\n", nr);
+ if (!cpu_rel_addr) {
+ pr_err("No cpu-release-addr for cpu %d\n", cpu);
return -ENOENT;
}
@@ -264,28 +221,18 @@ static int smp_85xx_kick_cpu(int nr)
spin_table = phys_to_virt(*cpu_rel_addr);
local_irq_save(flags);
-#ifdef CONFIG_PPC32
-#ifdef CONFIG_HOTPLUG_CPU
- /* Corresponding to generic_set_cpu_dead() */
- generic_set_cpu_up(nr);
+ hard_irq_disable();
- if (system_state == SYSTEM_RUNNING) {
- /*
- * To keep it compatible with old boot program which uses
- * cache-inhibit spin table, we need to flush the cache
- * before accessing spin table to invalidate any staled data.
- * We also need to flush the cache after writing to spin
- * table to push data out.
- */
- flush_spin_table(spin_table);
- out_be32(&spin_table->addr_l, 0);
- flush_spin_table(spin_table);
+ if (qoriq_pm_ops)
+ qoriq_pm_ops->cpu_up_prepare(cpu);
+ /* if cpu is not spinning, reset it */
+ if (read_spin_table_addr_l(spin_table) != 1) {
/*
* We don't set the BPTR register here since it already points
* to the boot page properly.
*/
- mpic_reset_core(nr);
+ mpic_reset_core(cpu);
/*
* wait until core is ready...
@@ -295,40 +242,23 @@ static int smp_85xx_kick_cpu(int nr)
if (!spin_event_timeout(
read_spin_table_addr_l(spin_table) == 1,
10000, 100)) {
- pr_err("%s: timeout waiting for core %d to reset\n",
- __func__, hw_cpu);
- ret = -ENOENT;
- goto out;
+ pr_err("timeout waiting for cpu %d to reset\n",
+ hw_cpu);
+ ret = -EAGAIN;
+ goto err;
}
-
- /* clear the acknowledge status */
- __secondary_hold_acknowledge = -1;
}
-#endif
- flush_spin_table(spin_table);
- out_be32(&spin_table->pir, hw_cpu);
- out_be32(&spin_table->addr_l, __pa(__early_start));
- flush_spin_table(spin_table);
-
- /* Wait a bit for the CPU to ack. */
- if (!spin_event_timeout(__secondary_hold_acknowledge == hw_cpu,
- 10000, 100)) {
- pr_err("%s: timeout waiting for core %d to ack\n",
- __func__, hw_cpu);
- ret = -ENOENT;
- goto out;
- }
-out:
-#else
- smp_generic_kick_cpu(nr);
flush_spin_table(spin_table);
out_be32(&spin_table->pir, hw_cpu);
+#ifdef CONFIG_PPC64
out_be64((u64 *)(&spin_table->addr_h),
__pa(ppc_function_entry(generic_secondary_smp_init)));
- flush_spin_table(spin_table);
+#else
+ out_be32(&spin_table->addr_l, __pa(__early_start));
#endif
-
+ flush_spin_table(spin_table);
+err:
local_irq_restore(flags);
if (ioremappable)
@@ -337,6 +267,81 @@ out:
return ret;
}
+static int smp_85xx_kick_cpu(int nr)
+{
+ int ret = 0;
+#ifdef CONFIG_PPC64
+ int primary = nr;
+#endif
+
+ WARN_ON(nr < 0 || nr >= num_possible_cpus());
+
+ pr_debug("kick CPU #%d\n", nr);
+
+#ifdef CONFIG_PPC64
+ if (threads_per_core == 2) {
+ if (WARN_ON_ONCE(!cpu_has_feature(CPU_FTR_SMT)))
+ return -ENOENT;
+
+ booting_thread_hwid = cpu_thread_in_core(nr);
+ primary = cpu_first_thread_sibling(nr);
+
+ if (qoriq_pm_ops)
+ qoriq_pm_ops->cpu_up_prepare(nr);
+
+ /*
+ * If either thread in the core is online, use it to start
+ * the other.
+ */
+ if (cpu_online(primary)) {
+ smp_call_function_single(primary,
+ wake_hw_thread, &nr, 1);
+ goto done;
+ } else if (cpu_online(primary + 1)) {
+ smp_call_function_single(primary + 1,
+ wake_hw_thread, &nr, 1);
+ goto done;
+ }
+
+ /*
+ * If getting here, it means both threads in the core are
+ * offline. So start the primary thread, then it will start
+ * the thread specified in booting_thread_hwid, the one
+ * corresponding to nr.
+ */
+
+ } else if (threads_per_core == 1) {
+ /*
+ * If one core has only one thread, set booting_thread_hwid to
+ * an invalid value.
+ */
+ booting_thread_hwid = INVALID_THREAD_HWID;
+
+ } else if (threads_per_core > 2) {
+ pr_err("Do not support more than 2 threads per CPU.");
+ return -EINVAL;
+ }
+
+ ret = smp_85xx_start_cpu(primary);
+ if (ret)
+ return ret;
+
+done:
+ paca[nr].cpu_start = 1;
+ generic_set_cpu_up(nr);
+
+ return ret;
+#else
+ ret = smp_85xx_start_cpu(nr);
+ if (ret)
+ return ret;
+
+ generic_set_cpu_up(nr);
+
+ return ret;
+#endif
+}
+
struct smp_ops_t smp_85xx_ops = {
.kick_cpu = smp_85xx_kick_cpu,
.cpu_bootable = smp_generic_cpu_bootable,
@@ -359,7 +364,7 @@ void mpc85xx_smp_kexec_cpu_down(int crash_shutdown, int secondary)
local_irq_disable();
if (secondary) {
- __flush_disable_L1();
+ cur_cpu_spec->cpu_down_flush();
atomic_inc(&kexec_down_cpus);
/* loop forever */
while (1);
@@ -467,16 +472,6 @@ static void smp_85xx_setup_cpu(int cpu_nr)
smp_85xx_basic_setup(cpu_nr);
}
-static const struct of_device_id mpc85xx_smp_guts_ids[] = {
- { .compatible = "fsl,mpc8572-guts", },
- { .compatible = "fsl,p1020-guts", },
- { .compatible = "fsl,p1021-guts", },
- { .compatible = "fsl,p1022-guts", },
- { .compatible = "fsl,p1023-guts", },
- { .compatible = "fsl,p2020-guts", },
- {},
-};
-
void __init mpc85xx_smp_init(void)
{
struct device_node *np;
@@ -500,22 +495,21 @@ void __init mpc85xx_smp_init(void)
smp_85xx_ops.probe = NULL;
}
- np = of_find_matching_node(NULL, mpc85xx_smp_guts_ids);
- if (np) {
- guts = of_iomap(np, 0);
- of_node_put(np);
- if (!guts) {
- pr_err("%s: Could not map guts node address\n",
- __func__);
- return;
- }
+#ifdef CONFIG_HOTPLUG_CPU
+#ifdef CONFIG_FSL_CORENET_RCPM
+ fsl_rcpm_init();
+#endif
+
+#ifdef CONFIG_FSL_PMC
+ mpc85xx_setup_pmc();
+#endif
+ if (qoriq_pm_ops) {
smp_85xx_ops.give_timebase = mpc85xx_give_timebase;
smp_85xx_ops.take_timebase = mpc85xx_take_timebase;
-#ifdef CONFIG_HOTPLUG_CPU
ppc_md.cpu_die = smp_85xx_mach_cpu_die;
-#endif
+ smp_85xx_ops.cpu_die = qoriq_cpu_kill;
}
-
+#endif
smp_ops = &smp_85xx_ops;
#ifdef CONFIG_KEXEC
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-14 23:25:27 +0000