1 files changed, 125 insertions, 23 deletions

diff --git a/arch/sparc/kernel/leon_smp.c b/arch/sparc/kernel/leon_smp.c
index 8f5de4aa3c0a..fe8fb44c609c 100644
--- a/arch/sparc/kernel/leon_smp.c
+++ b/arch/sparc/kernel/leon_smp.c
@@ -14,6 +14,7 @@
 #include <linux/smp.h>
 #include <linux/interrupt.h>
 #include <linux/kernel_stat.h>
+#include <linux/of.h>
 #include <linux/init.h>
 #include <linux/spinlock.h>
 #include <linux/mm.h>
@@ -29,6 +30,7 @@
 #include <asm/ptrace.h>
 #include <asm/atomic.h>
 #include <asm/irq_regs.h>
+#include <asm/traps.h>
 
 #include <asm/delay.h>
 #include <asm/irq.h>
@@ -50,9 +52,12 @@
 extern ctxd_t *srmmu_ctx_table_phys;
 static int smp_processors_ready;
 extern volatile unsigned long cpu_callin_map[NR_CPUS];
-extern unsigned char boot_cpu_id;
 extern cpumask_t smp_commenced_mask;
 void __init leon_configure_cache_smp(void);
+static void leon_ipi_init(void);
+
+/* IRQ number of LEON IPIs */
+int leon_ipi_irq = LEON3_IRQ_IPI_DEFAULT;
 
 static inline unsigned long do_swap(volatile unsigned long *ptr,
                                     unsigned long val)
@@ -94,8 +99,6 @@ void __cpuinit leon_callin(void)
         local_flush_cache_all();
         local_flush_tlb_all();
 
-        cpu_probe();
-
         /* Fix idle thread fields. */
         __asm__ __volatile__("ld [%0], %%g6\n\t" : : "r"(&current_set[cpuid])
                              : "memory" /* paranoid */);
@@ -104,11 +107,11 @@ void __cpuinit leon_callin(void)
         atomic_inc(&init_mm.mm_count);
         current->active_mm = &init_mm;
 
-        while (!cpu_isset(cpuid, smp_commenced_mask))
+        while (!cpumask_test_cpu(cpuid, &smp_commenced_mask))
                 mb();
 
         local_irq_enable();
-        cpu_set(cpuid, cpu_online_map);
+        set_cpu_online(cpuid, true);
 }
 
 /*
@@ -179,13 +182,16 @@ void __init leon_boot_cpus(void)
         int nrcpu = leon_smp_nrcpus();
         int me = smp_processor_id();
 
+        /* Setup IPI */
+        leon_ipi_init();
+
         printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x\n", (unsigned int)me,
                (unsigned int)nrcpu, (unsigned int)NR_CPUS,
                (unsigned int)&(leon3_irqctrl_regs->mpstatus));
 
         leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, me);
         leon_enable_irq_cpu(LEON3_IRQ_TICKER, me);
-        leon_enable_irq_cpu(LEON3_IRQ_RESCHEDULE, me);
+        leon_enable_irq_cpu(leon_ipi_irq, me);
 
         leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER);
 
@@ -220,6 +226,10 @@ int __cpuinit leon_boot_one_cpu(int i)
                (unsigned int)&leon3_irqctrl_regs->mpstatus);
         local_flush_cache_all();
 
+        /* Make sure all IRQs are of from the start for this new CPU */
+        LEON_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[i], 0);
+
+        /* Wake one CPU */
         LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i);
 
         /* wheee... it's going... */
@@ -236,7 +246,7 @@ int __cpuinit leon_boot_one_cpu(int i)
         } else {
                 leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, i);
                 leon_enable_irq_cpu(LEON3_IRQ_TICKER, i);
-                leon_enable_irq_cpu(LEON3_IRQ_RESCHEDULE, i);
+                leon_enable_irq_cpu(leon_ipi_irq, i);
         }
 
         local_flush_cache_all();
@@ -262,21 +272,21 @@ void __init leon_smp_done(void)
         local_flush_cache_all();
 
         /* Free unneeded trap tables */
-        if (!cpu_isset(1, cpu_present_map)) {
+        if (!cpu_present(1)) {
                 ClearPageReserved(virt_to_page(&trapbase_cpu1));
                 init_page_count(virt_to_page(&trapbase_cpu1));
                 free_page((unsigned long)&trapbase_cpu1);
                 totalram_pages++;
                 num_physpages++;
         }
-        if (!cpu_isset(2, cpu_present_map)) {
+        if (!cpu_present(2)) {
                 ClearPageReserved(virt_to_page(&trapbase_cpu2));
                 init_page_count(virt_to_page(&trapbase_cpu2));
                 free_page((unsigned long)&trapbase_cpu2);
                 totalram_pages++;
                 num_physpages++;
         }
-        if (!cpu_isset(3, cpu_present_map)) {
+        if (!cpu_present(3)) {
                 ClearPageReserved(virt_to_page(&trapbase_cpu3));
                 init_page_count(virt_to_page(&trapbase_cpu3));
                 free_page((unsigned long)&trapbase_cpu3);
@@ -292,6 +302,99 @@ void leon_irq_rotate(int cpu)
 {
 }
 
+struct leon_ipi_work {
+        int single;
+        int msk;
+        int resched;
+};
+
+static DEFINE_PER_CPU_SHARED_ALIGNED(struct leon_ipi_work, leon_ipi_work);
+
+/* Initialize IPIs on the LEON, in order to save IRQ resources only one IRQ
+ * is used for all three types of IPIs.
+ */
+static void __init leon_ipi_init(void)
+{
+        int cpu, len;
+        struct leon_ipi_work *work;
+        struct property *pp;
+        struct device_node *rootnp;
+        struct tt_entry *trap_table;
+        unsigned long flags;
+
+        /* Find IPI IRQ or stick with default value */
+        rootnp = of_find_node_by_path("/ambapp0");
+        if (rootnp) {
+                pp = of_find_property(rootnp, "ipi_num", &len);
+                if (pp && (*(int *)pp->value))
+                        leon_ipi_irq = *(int *)pp->value;
+        }
+        printk(KERN_INFO "leon: SMP IPIs at IRQ %d\n", leon_ipi_irq);
+
+        /* Adjust so that we jump directly to smpleon_ipi */
+        local_irq_save(flags);
+        trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_ipi_irq - 1)];
+        trap_table->inst_three += smpleon_ipi - real_irq_entry;
+        local_flush_cache_all();
+        local_irq_restore(flags);
+
+        for_each_possible_cpu(cpu) {
+                work = &per_cpu(leon_ipi_work, cpu);
+                work->single = work->msk = work->resched = 0;
+        }
+}
+
+static void leon_ipi_single(int cpu)
+{
+        struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
+
+        /* Mark work */
+        work->single = 1;
+
+        /* Generate IRQ on the CPU */
+        set_cpu_int(cpu, leon_ipi_irq);
+}
+
+static void leon_ipi_mask_one(int cpu)
+{
+        struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
+
+        /* Mark work */
+        work->msk = 1;
+
+        /* Generate IRQ on the CPU */
+        set_cpu_int(cpu, leon_ipi_irq);
+}
+
+static void leon_ipi_resched(int cpu)
+{
+        struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
+
+        /* Mark work */
+        work->resched = 1;
+
+        /* Generate IRQ on the CPU (any IRQ will cause resched) */
+        set_cpu_int(cpu, leon_ipi_irq);
+}
+
+void leonsmp_ipi_interrupt(void)
+{
+        struct leon_ipi_work *work = &__get_cpu_var(leon_ipi_work);
+
+        if (work->single) {
+                work->single = 0;
+                smp_call_function_single_interrupt();
+        }
+        if (work->msk) {
+                work->msk = 0;
+                smp_call_function_interrupt();
+        }
+        if (work->resched) {
+                work->resched = 0;
+                smp_resched_interrupt();
+        }
+}
+
 static struct smp_funcall {
         smpfunc_t func;
         unsigned long arg1;
@@ -337,10 +440,10 @@ static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
                 {
                         register int i;
 
-                        cpu_clear(smp_processor_id(), mask);
-                        cpus_and(mask, cpu_online_map, mask);
+                        cpumask_clear_cpu(smp_processor_id(), &mask);
+                        cpumask_and(&mask, cpu_online_mask, &mask);
                         for (i = 0; i <= high; i++) {
-                                if (cpu_isset(i, mask)) {
+                                if (cpumask_test_cpu(i, &mask)) {
                                         ccall_info.processors_in[i] = 0;
                                         ccall_info.processors_out[i] = 0;
                                         set_cpu_int(i, LEON3_IRQ_CROSS_CALL);
@@ -354,7 +457,7 @@ static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
 
                         i = 0;
                         do {
-                                if (!cpu_isset(i, mask))
+                                if (!cpumask_test_cpu(i, &mask))
                                         continue;
 
                                 while (!ccall_info.processors_in[i])
@@ -363,7 +466,7 @@ static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
 
                         i = 0;
                         do {
-                                if (!cpu_isset(i, mask))
+                                if (!cpumask_test_cpu(i, &mask))
                                         continue;
 
                                 while (!ccall_info.processors_out[i])
@@ -386,27 +489,23 @@ void leon_cross_call_irq(void)
         ccall_info.processors_out[i] = 1;
 }
 
-void leon_percpu_timer_interrupt(struct pt_regs *regs)
+irqreturn_t leon_percpu_timer_interrupt(int irq, void *unused)
 {
-        struct pt_regs *old_regs;
         int cpu = smp_processor_id();
 
-        old_regs = set_irq_regs(regs);
-
         leon_clear_profile_irq(cpu);
 
         profile_tick(CPU_PROFILING);
 
         if (!--prof_counter(cpu)) {
-                int user = user_mode(regs);
+                int user = user_mode(get_irq_regs());
 
-                irq_enter();
                 update_process_times(user);
-                irq_exit();
 
                 prof_counter(cpu) = prof_multiplier(cpu);
         }
-        set_irq_regs(old_regs);
+
+        return IRQ_HANDLED;
 }
 
 static void __init smp_setup_percpu_timer(void)
@@ -449,6 +548,9 @@ void __init leon_init_smp(void)
         BTFIXUPSET_CALL(smp_cross_call, leon_cross_call, BTFIXUPCALL_NORM);
         BTFIXUPSET_CALL(__hard_smp_processor_id, __leon_processor_id,
                         BTFIXUPCALL_NORM);
+        BTFIXUPSET_CALL(smp_ipi_resched, leon_ipi_resched, BTFIXUPCALL_NORM);
+        BTFIXUPSET_CALL(smp_ipi_single, leon_ipi_single, BTFIXUPCALL_NORM);
+        BTFIXUPSET_CALL(smp_ipi_mask_one, leon_ipi_mask_one, BTFIXUPCALL_NORM);
 }
 
 #endif /* CONFIG_SPARC_LEON */