arch/powerpc/platforms/pseries/hvCall_inst.c

Source file repositories/reference/linux-study-clean/arch/powerpc/platforms/pseries/hvCall_inst.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/platforms/pseries/hvCall_inst.c
Extension
.c
Size
3297 bytes
Lines
141
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct hcall_stats {
	unsigned long	num_calls;	/* number of calls (on this CPU) */
	unsigned long	tb_total;	/* total wall time (mftb) of calls. */
	unsigned long	purr_total;	/* total cpu time (PURR) of calls. */
	unsigned long	tb_start;
	unsigned long	purr_start;
};
#define HCALL_STAT_ARRAY_SIZE	((MAX_HCALL_OPCODE >> 2) + 1)

static DEFINE_PER_CPU(struct hcall_stats[HCALL_STAT_ARRAY_SIZE], hcall_stats);

/*
 * Routines for displaying the statistics in debugfs
 */
static void *hc_start(struct seq_file *m, loff_t *pos)
{
	if ((int)*pos < (HCALL_STAT_ARRAY_SIZE-1))
		return (void *)(unsigned long)(*pos + 1);

	return NULL;
}

static void *hc_next(struct seq_file *m, void *p, loff_t * pos)
{
	++*pos;

	return hc_start(m, pos);
}

static void hc_stop(struct seq_file *m, void *p)
{
}

static int hc_show(struct seq_file *m, void *p)
{
	unsigned long h_num = (unsigned long)p;
	struct hcall_stats *hs = m->private;

	if (hs[h_num].num_calls) {
		if (cpu_has_feature(CPU_FTR_PURR))
			seq_printf(m, "%lu %lu %lu %lu\n", h_num<<2,
				   hs[h_num].num_calls,
				   hs[h_num].tb_total,
				   hs[h_num].purr_total);
		else
			seq_printf(m, "%lu %lu %lu\n", h_num<<2,
				   hs[h_num].num_calls,
				   hs[h_num].tb_total);
	}

	return 0;
}

static const struct seq_operations hcall_inst_sops = {
        .start = hc_start,
        .next  = hc_next,
        .stop  = hc_stop,
        .show  = hc_show
};

DEFINE_SEQ_ATTRIBUTE(hcall_inst);

#define	HCALL_ROOT_DIR		"hcall_inst"
#define CPU_NAME_BUF_SIZE	32


static void probe_hcall_entry(void *ignored, unsigned long opcode, unsigned long *args)
{
	struct hcall_stats *h;

	if (opcode > MAX_HCALL_OPCODE)
		return;

	h = this_cpu_ptr(&hcall_stats[opcode / 4]);
	h->tb_start = mftb();
	h->purr_start = mfspr(SPRN_PURR);
}

static void probe_hcall_exit(void *ignored, unsigned long opcode, long retval,
			     unsigned long *retbuf)
{
	struct hcall_stats *h;

	if (opcode > MAX_HCALL_OPCODE)
		return;

	h = this_cpu_ptr(&hcall_stats[opcode / 4]);
	h->num_calls++;
	h->tb_total += mftb() - h->tb_start;
	h->purr_total += mfspr(SPRN_PURR) - h->purr_start;

Annotation

Implementation Notes