#undef DEBUG
#include <linux/config.h>
+#include <linux/cpu.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/console.h>
#include <linux/pci.h>
-#include <linux/version.h>
+#include <linux/utsname.h>
#include <linux/adb.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <asm/nvram.h>
#include <asm/plpar_wrappers.h>
#include <asm/xics.h>
-#include <asm/cputable.h>
+#include <asm/firmware.h>
+#include <asm/pmc.h>
#include "i8259.h"
#include "mpic.h"
extern void pSeries_system_reset_exception(struct pt_regs *regs);
extern int pSeries_machine_check_exception(struct pt_regs *regs);
+static int pseries_shared_idle(void);
+static int pseries_dedicated_idle(void);
+
static volatile void __iomem * chrp_int_ack_special;
struct mpic *pSeries_mpic;
" MPIC ");
}
+static void pseries_lpar_enable_pmcs(void)
+{
+ unsigned long set, reset;
+
+ power4_enable_pmcs();
+
+ set = 1UL << 63;
+ reset = 0;
+ plpar_hcall_norets(H_PERFMON, set, reset);
+
+ /* instruct hypervisor to maintain PMCs */
+ if (firmware_has_feature(FW_FEATURE_SPLPAR))
+ get_paca()->lppaca.pmcregs_in_use = 1;
+}
+
static void __init pSeries_setup_arch(void)
{
/* Fixup ppc_md depending on the type of interrupt controller */
/* Find and initialize PCI host bridges */
init_pci_config_tokens();
- eeh_init();
find_and_init_phbs();
+ eeh_init();
#ifdef CONFIG_DUMMY_CONSOLE
conswitchp = &dummy_con;
pSeries_nvram_init();
- if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR)
+ /* Choose an idle loop */
+ if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
vpa_init(boot_cpuid);
+ if (get_paca()->lppaca.shared_proc) {
+ printk(KERN_INFO "Using shared processor idle loop\n");
+ ppc_md.idle_loop = pseries_shared_idle;
+ } else {
+ printk(KERN_INFO "Using dedicated idle loop\n");
+ ppc_md.idle_loop = pseries_dedicated_idle;
+ }
+ } else {
+ printk(KERN_INFO "Using default idle loop\n");
+ ppc_md.idle_loop = default_idle;
+ }
+
+ if (systemcfg->platform & PLATFORM_LPAR)
+ ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
+ else
+ ppc_md.enable_pmcs = power4_enable_pmcs;
}
static int __init pSeries_init_panel(void)
{
/* Manually leave the kernel version on the panel. */
ppc_md.progress("Linux ppc64\n", 0);
- ppc_md.progress(UTS_RELEASE, 0);
+ ppc_md.progress(system_utsname.version, 0);
return 0;
}
arch_initcall(pSeries_init_panel);
-/* Build up the firmware_features bitmask field
+/* Build up the ppc64_firmware_features bitmask field
* using contents of device-tree/ibm,hypertas-functions.
* Ultimately this functionality may be moved into prom.c prom_init().
*/
-void __init fw_feature_init(void)
+static void __init fw_feature_init(void)
{
struct device_node * dn;
char * hypertas;
DBG(" -> fw_feature_init()\n");
- cur_cpu_spec->firmware_features = 0;
+ ppc64_firmware_features = 0;
dn = of_find_node_by_path("/rtas");
if (dn == NULL) {
printk(KERN_ERR "WARNING ! Cannot find RTAS in device-tree !\n");
if ((firmware_features_table[i].name) &&
(strcmp(firmware_features_table[i].name,hypertas))==0) {
/* we have a match */
- cur_cpu_spec->firmware_features |=
+ ppc64_firmware_features |=
(firmware_features_table[i].val);
break;
}
of_node_put(dn);
no_rtas:
printk(KERN_INFO "firmware_features = 0x%lx\n",
- cur_cpu_spec->firmware_features);
+ ppc64_firmware_features);
DBG(" <- fw_feature_init()\n");
}
comport = (void *)ioremap(physport, 16);
udbg_init_uart(comport, default_speed);
- ppc_md.udbg_putc = udbg_putc;
- ppc_md.udbg_getc = udbg_getc;
- ppc_md.udbg_getc_poll = udbg_getc_poll;
DBG("Hello World !\n");
}
return 1;
}
+DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
+
+static inline void dedicated_idle_sleep(unsigned int cpu)
+{
+ struct paca_struct *ppaca = &paca[cpu ^ 1];
+
+ /* Only sleep if the other thread is not idle */
+ if (!(ppaca->lppaca.idle)) {
+ local_irq_disable();
+
+ /*
+ * We are about to sleep the thread and so wont be polling any
+ * more.
+ */
+ clear_thread_flag(TIF_POLLING_NRFLAG);
+
+ /*
+ * SMT dynamic mode. Cede will result in this thread going
+ * dormant, if the partner thread is still doing work. Thread
+ * wakes up if partner goes idle, an interrupt is presented, or
+ * a prod occurs. Returning from the cede enables external
+ * interrupts.
+ */
+ if (!need_resched())
+ cede_processor();
+ else
+ local_irq_enable();
+ } else {
+ /*
+ * Give the HV an opportunity at the processor, since we are
+ * not doing any work.
+ */
+ poll_pending();
+ }
+}
+
+static int pseries_dedicated_idle(void)
+{
+ long oldval;
+ struct paca_struct *lpaca = get_paca();
+ unsigned int cpu = smp_processor_id();
+ unsigned long start_snooze;
+ unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
+
+ while (1) {
+ /*
+ * Indicate to the HV that we are idle. Now would be
+ * a good time to find other work to dispatch.
+ */
+ lpaca->lppaca.idle = 1;
+
+ oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
+ if (!oldval) {
+ set_thread_flag(TIF_POLLING_NRFLAG);
+
+ start_snooze = __get_tb() +
+ *smt_snooze_delay * tb_ticks_per_usec;
+
+ while (!need_resched() && !cpu_is_offline(cpu)) {
+ ppc64_runlatch_off();
+
+ /*
+ * Go into low thread priority and possibly
+ * low power mode.
+ */
+ HMT_low();
+ HMT_very_low();
+
+ if (*smt_snooze_delay != 0 &&
+ __get_tb() > start_snooze) {
+ HMT_medium();
+ dedicated_idle_sleep(cpu);
+ }
+
+ }
+
+ HMT_medium();
+ clear_thread_flag(TIF_POLLING_NRFLAG);
+ } else {
+ set_need_resched();
+ }
+
+ lpaca->lppaca.idle = 0;
+ ppc64_runlatch_on();
+
+ schedule();
+
+ if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
+ cpu_die();
+ }
+}
+
+static int pseries_shared_idle(void)
+{
+ struct paca_struct *lpaca = get_paca();
+ unsigned int cpu = smp_processor_id();
+
+ while (1) {
+ /*
+ * Indicate to the HV that we are idle. Now would be
+ * a good time to find other work to dispatch.
+ */
+ lpaca->lppaca.idle = 1;
+
+ while (!need_resched() && !cpu_is_offline(cpu)) {
+ local_irq_disable();
+ ppc64_runlatch_off();
+
+ /*
+ * Yield the processor to the hypervisor. We return if
+ * an external interrupt occurs (which are driven prior
+ * to returning here) or if a prod occurs from another
+ * processor. When returning here, external interrupts
+ * are enabled.
+ *
+ * Check need_resched() again with interrupts disabled
+ * to avoid a race.
+ */
+ if (!need_resched())
+ cede_processor();
+ else
+ local_irq_enable();
+
+ HMT_medium();
+ }
+
+ lpaca->lppaca.idle = 0;
+ ppc64_runlatch_on();
+
+ schedule();
+
+ if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
+ cpu_die();
+ }
+
+ return 0;
+}
+
+static int pSeries_pci_probe_mode(struct pci_bus *bus)
+{
+ if (systemcfg->platform & PLATFORM_LPAR)
+ return PCI_PROBE_DEVTREE;
+ return PCI_PROBE_NORMAL;
+}
+
struct machdep_calls __initdata pSeries_md = {
.probe = pSeries_probe,
.setup_arch = pSeries_setup_arch,
.get_cpuinfo = pSeries_get_cpuinfo,
.log_error = pSeries_log_error,
.pcibios_fixup = pSeries_final_fixup,
+ .pci_probe_mode = pSeries_pci_probe_mode,
.irq_bus_setup = pSeries_irq_bus_setup,
.restart = rtas_restart,
.power_off = rtas_power_off,
git.samba.org / sfrench / cifs-2.6.git / blobdiff