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Diffstat (limited to 'arch/powerpc/kernel/rtas.c')
-rw-r--r--arch/powerpc/kernel/rtas.c111
1 files changed, 106 insertions, 5 deletions
diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
index 4283fa33f78..7fe4a5c944c 100644
--- a/arch/powerpc/kernel/rtas.c
+++ b/arch/powerpc/kernel/rtas.c
@@ -17,6 +17,7 @@
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/init.h>
+#include <linux/capability.h>
#include <linux/delay.h>
#include <asm/prom.h>
@@ -29,11 +30,17 @@
#include <asm/delay.h>
#include <asm/uaccess.h>
#include <asm/lmb.h>
+#include <asm/udbg.h>
struct rtas_t rtas = {
.lock = SPIN_LOCK_UNLOCKED
};
+struct rtas_suspend_me_data {
+ long waiting;
+ struct rtas_args *args;
+};
+
EXPORT_SYMBOL(rtas);
DEFINE_SPINLOCK(rtas_data_buf_lock);
@@ -52,7 +59,7 @@ EXPORT_SYMBOL(rtas_flash_term_hook);
* are designed only for very early low-level debugging, which
* is why the token is hard-coded to 10.
*/
-void call_rtas_display_status(unsigned char c)
+static void call_rtas_display_status(char c)
{
struct rtas_args *args = &rtas.args;
unsigned long s;
@@ -65,14 +72,14 @@ void call_rtas_display_status(unsigned char c)
args->nargs = 1;
args->nret = 1;
args->rets = (rtas_arg_t *)&(args->args[1]);
- args->args[0] = (int)c;
+ args->args[0] = (unsigned char)c;
enter_rtas(__pa(args));
spin_unlock_irqrestore(&rtas.lock, s);
}
-void call_rtas_display_status_delay(unsigned char c)
+static void call_rtas_display_status_delay(char c)
{
static int pending_newline = 0; /* did last write end with unprinted newline? */
static int width = 16;
@@ -96,6 +103,11 @@ void call_rtas_display_status_delay(unsigned char c)
}
}
+void __init udbg_init_rtas(void)
+{
+ udbg_putc = call_rtas_display_status_delay;
+}
+
void rtas_progress(char *s, unsigned short hex)
{
struct device_node *root;
@@ -549,6 +561,80 @@ void rtas_os_term(char *str)
} while (status == RTAS_BUSY);
}
+static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE;
+#ifdef CONFIG_PPC_PSERIES
+static void rtas_percpu_suspend_me(void *info)
+{
+ long rc;
+ long flags;
+ struct rtas_suspend_me_data *data =
+ (struct rtas_suspend_me_data *)info;
+
+ /*
+ * We use "waiting" to indicate our state. As long
+ * as it is >0, we are still trying to all join up.
+ * If it goes to 0, we have successfully joined up and
+ * one thread got H_Continue. If any error happens,
+ * we set it to <0.
+ */
+ local_irq_save(flags);
+ do {
+ rc = plpar_hcall_norets(H_JOIN);
+ smp_rmb();
+ } while (rc == H_Success && data->waiting > 0);
+ if (rc == H_Success)
+ goto out;
+
+ if (rc == H_Continue) {
+ data->waiting = 0;
+ rtas_call(ibm_suspend_me_token, 0, 1,
+ data->args->args);
+ } else {
+ data->waiting = -EBUSY;
+ printk(KERN_ERR "Error on H_Join hypervisor call\n");
+ }
+
+out:
+ /* before we restore interrupts, make sure we don't
+ * generate a spurious soft lockup errors
+ */
+ touch_softlockup_watchdog();
+ local_irq_restore(flags);
+ return;
+}
+
+static int rtas_ibm_suspend_me(struct rtas_args *args)
+{
+ int i;
+
+ struct rtas_suspend_me_data data;
+
+ data.waiting = 1;
+ data.args = args;
+
+ /* Call function on all CPUs. One of us will make the
+ * rtas call
+ */
+ if (on_each_cpu(rtas_percpu_suspend_me, &data, 1, 0))
+ data.waiting = -EINVAL;
+
+ if (data.waiting != 0)
+ printk(KERN_ERR "Error doing global join\n");
+
+ /* Prod each CPU. This won't hurt, and will wake
+ * anyone we successfully put to sleep with H_Join
+ */
+ for_each_cpu(i)
+ plpar_hcall_norets(H_PROD, i);
+
+ return data.waiting;
+}
+#else /* CONFIG_PPC_PSERIES */
+static int rtas_ibm_suspend_me(struct rtas_args *args)
+{
+ return -ENOSYS;
+}
+#endif
asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
{
@@ -556,6 +642,7 @@ asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
unsigned long flags;
char *buff_copy, *errbuf = NULL;
int nargs;
+ int rc;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
@@ -574,6 +661,17 @@ asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
nargs * sizeof(rtas_arg_t)) != 0)
return -EFAULT;
+ if (args.token == RTAS_UNKNOWN_SERVICE)
+ return -EINVAL;
+
+ /* Need to handle ibm,suspend_me call specially */
+ if (args.token == ibm_suspend_me_token) {
+ rc = rtas_ibm_suspend_me(&args);
+ if (rc)
+ return rc;
+ goto copy_return;
+ }
+
buff_copy = get_errorlog_buffer();
spin_lock_irqsave(&rtas.lock, flags);
@@ -597,6 +695,7 @@ asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
kfree(buff_copy);
}
+ copy_return:
/* Copy out args. */
if (copy_to_user(uargs->args + nargs,
args.args + nargs,
@@ -632,7 +731,7 @@ void rtas_stop_self(void)
}
/*
- * Call early during boot, before mem init or bootmem, to retreive the RTAS
+ * Call early during boot, before mem init or bootmem, to retrieve the RTAS
* informations from the device-tree and allocate the RMO buffer for userland
* accesses.
*/
@@ -668,8 +767,10 @@ void __init rtas_initialize(void)
* the stop-self token if any
*/
#ifdef CONFIG_PPC64
- if (_machine == PLATFORM_PSERIES_LPAR)
+ if (_machine == PLATFORM_PSERIES_LPAR) {
rtas_region = min(lmb.rmo_size, RTAS_INSTANTIATE_MAX);
+ ibm_suspend_me_token = rtas_token("ibm,suspend-me");
+ }
#endif
rtas_rmo_buf = lmb_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region);