sparc64: Provide oprofile pseudo-NMI on Niagara.
David S. Miller [Fri, 28 Nov 2008 10:27:42 +0000 (02:27 -0800)]
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/oprofile/init.c

index e979dcd..d6e170c 100644 (file)
 #include <linux/init.h>
  
 #ifdef CONFIG_SPARC64
+#include <asm/hypervisor.h>
 #include <asm/spitfire.h>
 #include <asm/cpudata.h>
 #include <asm/irq.h>
 
 static int nmi_enabled;
 
+struct pcr_ops {
+       u64 (*read)(void);
+       void (*write)(u64);
+};
+static const struct pcr_ops *pcr_ops;
+
+static u64 direct_pcr_read(void)
+{
+       u64 val;
+
+       read_pcr(val);
+       return val;
+}
+
+static void direct_pcr_write(u64 val)
+{
+       write_pcr(val);
+}
+
+static const struct pcr_ops direct_pcr_ops = {
+       .read   = direct_pcr_read,
+       .write  = direct_pcr_write,
+};
+
+static void n2_pcr_write(u64 val)
+{
+       unsigned long ret;
+
+       ret = sun4v_niagara2_setperf(HV_N2_PERF_SPARC_CTL, val);
+       if (val != HV_EOK)
+               write_pcr(val);
+}
+
+static const struct pcr_ops n2_pcr_ops = {
+       .read   = direct_pcr_read,
+       .write  = n2_pcr_write,
+};
+
+/* In order to commonize as much of the implementation as
+ * possible, we use PICH as our counter.  Mostly this is
+ * to accomodate Niagara-1 which can only count insn cycles
+ * in PICH.
+ */
 static u64 picl_value(void)
 {
        u32 delta = local_cpu_data().clock_tick / HZ;
 
-       return (0 - delta) & 0xffffffff;
+       return ((u64)((0 - delta) & 0xffffffff)) << 32;
 }
 
-#define PCR_PIC_PRIV   0x1 /* PIC access is privileged */
-#define PCR_STRACE     0x2 /* Trace supervisor events  */
-#define PCR_UTRACE     0x4 /* Trace user events        */
+#define PCR_PIC_PRIV           0x00000001 /* PIC access is privileged */
+#define PCR_STRACE             0x00000002 /* Trace supervisor events  */
+#define PCR_UTRACE             0x00000004 /* Trace user events        */
+#define PCR_N2_HTRACE          0x00000008 /* Trace hypervisor events  */
+#define PCR_N2_TOE_OV0         0x00000010 /* Trap if PIC 0 overflows  */
+#define PCR_N2_TOE_OV1         0x00000020 /* Trap if PIC 1 overflows  */
+#define PCR_N2_MASK0           0x00003fc0
+#define PCR_N2_MASK0_SHIFT     6
+#define PCR_N2_SL0             0x0003c000
+#define PCR_N2_SL0_SHIFT       14
+#define PCR_N2_OV0             0x00040000
+#define PCR_N2_MASK1           0x07f80000
+#define PCR_N2_MASK1_SHIFT     19
+#define PCR_N2_SL1             0x78000000
+#define PCR_N2_SL1_SHIFT       27
+#define PCR_N2_OV1             0x80000000
+
+#define PCR_SUN4U_ENABLE       (PCR_PIC_PRIV | PCR_STRACE | PCR_UTRACE)
+#define PCR_N2_ENABLE          (PCR_PIC_PRIV | PCR_STRACE | PCR_UTRACE | \
+                                PCR_N2_TOE_OV1 | \
+                                (2 << PCR_N2_SL1_SHIFT) | \
+                                (0xff << PCR_N2_MASK1_SHIFT))
+
+static u64 pcr_enable = PCR_SUN4U_ENABLE;
 
 static void nmi_handler(struct pt_regs *regs)
 {
-       write_pcr(PCR_PIC_PRIV);
+       pcr_ops->write(PCR_PIC_PRIV);
 
        if (nmi_enabled) {
                oprofile_add_sample(regs, 0);
 
                write_pic(picl_value());
-               write_pcr(PCR_PIC_PRIV | PCR_STRACE | PCR_UTRACE);
+               pcr_ops->write(pcr_enable);
        }
 }
 
@@ -48,21 +113,15 @@ static void nmi_handler(struct pt_regs *regs)
  */
 static void cpu_nmi_start(void *_unused)
 {
-       write_pcr(PCR_PIC_PRIV);
+       pcr_ops->write(PCR_PIC_PRIV);
        write_pic(picl_value());
 
-       /* Bit 0: PIC access is privileged
-        * Bit 1: Supervisor Trace
-        * Bit 2: User Trace
-        *
-        * And the event selection code for cpu cycles is zero.
-        */
-       write_pcr(PCR_PIC_PRIV | PCR_STRACE | PCR_UTRACE);
+       pcr_ops->write(pcr_enable);
 }
 
 static void cpu_nmi_stop(void *_unused)
 {
-       write_pcr(PCR_PIC_PRIV);
+       pcr_ops->write(PCR_PIC_PRIV);
 }
 
 static int nmi_start(void)
@@ -94,10 +153,67 @@ static void nmi_stop(void)
        synchronize_sched();
 }
 
+static unsigned long perf_hsvc_group;
+static unsigned long perf_hsvc_major;
+static unsigned long perf_hsvc_minor;
+
+static int __init register_perf_hsvc(void)
+{
+       if (tlb_type == hypervisor) {
+               switch (sun4v_chip_type) {
+               case SUN4V_CHIP_NIAGARA1:
+                       perf_hsvc_group = HV_GRP_NIAG_PERF;
+                       break;
+
+               case SUN4V_CHIP_NIAGARA2:
+                       perf_hsvc_group = HV_GRP_N2_CPU;
+                       break;
+
+               default:
+                       return -ENODEV;
+               }
+
+
+               perf_hsvc_major = 1;
+               perf_hsvc_minor = 0;
+               if (sun4v_hvapi_register(perf_hsvc_group,
+                                        perf_hsvc_major,
+                                        &perf_hsvc_minor)) {
+                       printk("perfmon: Could not register N2 hvapi.\n");
+                       return -ENODEV;
+               }
+       }
+       return 0;
+}
+
+static void unregister_perf_hsvc(void)
+{
+       if (tlb_type != hypervisor)
+               return;
+       sun4v_hvapi_unregister(perf_hsvc_group);
+}
+
 static int oprofile_nmi_init(struct oprofile_operations *ops)
 {
-       if (tlb_type != cheetah && tlb_type != cheetah_plus)
+       int err = register_perf_hsvc();
+
+       if (err)
+               return err;
+
+       switch (tlb_type) {
+       case hypervisor:
+               pcr_ops = &n2_pcr_ops;
+               pcr_enable = PCR_N2_ENABLE;
+               break;
+
+       case cheetah:
+       case cheetah_plus:
+               pcr_ops = &direct_pcr_ops;
+               break;
+
+       default:
                return -ENODEV;
+       }
 
        ops->create_files = NULL;
        ops->setup = NULL;
@@ -128,4 +244,7 @@ int __init oprofile_arch_init(struct oprofile_operations *ops)
 
 void oprofile_arch_exit(void)
 {
+#ifdef CONFIG_SPARC64
+       unregister_perf_hsvc();
+#endif
 }