static int sba_proc_info()

in sba_iommu.c [1776:1844]

• 57 lines of code
• 5 McCabe index (conditional complexity)

static int sba_proc_info(struct seq_file *m, void *p)
{
	struct sba_device *sba_dev = sba_list;
	struct ioc *ioc = &sba_dev->ioc[0];	/* FIXME: Multi-IOC support! */
	int total_pages = (int) (ioc->res_size << 3); /* 8 bits per byte */
#ifdef SBA_COLLECT_STATS
	unsigned long avg = 0, min, max;
#endif
	int i;

	seq_printf(m, "%s rev %d.%d\n",
		   sba_dev->name,
		   (sba_dev->hw_rev & 0x7) + 1,
		   (sba_dev->hw_rev & 0x18) >> 3);
	seq_printf(m, "IO PDIR size    : %d bytes (%d entries)\n",
		   (int)((ioc->res_size << 3) * sizeof(u64)), /* 8 bits/byte */
		   total_pages);

	seq_printf(m, "Resource bitmap : %d bytes (%d pages)\n",
		   ioc->res_size, ioc->res_size << 3);   /* 8 bits per byte */

	seq_printf(m, "LMMIO_BASE/MASK/ROUTE %08x %08x %08x\n",
		   READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_BASE),
		   READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_MASK),
		   READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_ROUTE));

	for (i=0; i<4; i++)
		seq_printf(m, "DIR%d_BASE/MASK/ROUTE %08x %08x %08x\n",
			   i,
			   READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_BASE  + i*0x18),
			   READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_MASK  + i*0x18),
			   READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_ROUTE + i*0x18));

#ifdef SBA_COLLECT_STATS
	seq_printf(m, "IO PDIR entries : %ld free  %ld used (%d%%)\n",
		   total_pages - ioc->used_pages, ioc->used_pages,
		   (int)(ioc->used_pages * 100 / total_pages));

	min = max = ioc->avg_search[0];
	for (i = 0; i < SBA_SEARCH_SAMPLE; i++) {
		avg += ioc->avg_search[i];
		if (ioc->avg_search[i] > max) max = ioc->avg_search[i];
		if (ioc->avg_search[i] < min) min = ioc->avg_search[i];
	}
	avg /= SBA_SEARCH_SAMPLE;
	seq_printf(m, "  Bitmap search : %ld/%ld/%ld (min/avg/max CPU Cycles)\n",
		   min, avg, max);

	seq_printf(m, "pci_map_single(): %12ld calls  %12ld pages (avg %d/1000)\n",
		   ioc->msingle_calls, ioc->msingle_pages,
		   (int)((ioc->msingle_pages * 1000)/ioc->msingle_calls));

	/* KLUGE - unmap_sg calls unmap_single for each mapped page */
	min = ioc->usingle_calls;
	max = ioc->usingle_pages - ioc->usg_pages;
	seq_printf(m, "pci_unmap_single: %12ld calls  %12ld pages (avg %d/1000)\n",
		   min, max, (int)((max * 1000)/min));

	seq_printf(m, "pci_map_sg()    : %12ld calls  %12ld pages (avg %d/1000)\n",
		   ioc->msg_calls, ioc->msg_pages,
		   (int)((ioc->msg_pages * 1000)/ioc->msg_calls));

	seq_printf(m, "pci_unmap_sg()  : %12ld calls  %12ld pages (avg %d/1000)\n",
		   ioc->usg_calls, ioc->usg_pages,
		   (int)((ioc->usg_pages * 1000)/ioc->usg_calls));
#endif

	return 0;
}