static int knl_mci_bind_devs()

in sb_edac.c [2812:2935]

• 93 lines of code
• 25 McCabe index (conditional complexity)

static int knl_mci_bind_devs(struct mem_ctl_info *mci,
			struct sbridge_dev *sbridge_dev)
{
	struct sbridge_pvt *pvt = mci->pvt_info;
	struct pci_dev *pdev;
	int dev, func;

	int i;
	int devidx;

	for (i = 0; i < sbridge_dev->n_devs; i++) {
		pdev = sbridge_dev->pdev[i];
		if (!pdev)
			continue;

		/* Extract PCI device and function. */
		dev = (pdev->devfn >> 3) & 0x1f;
		func = pdev->devfn & 0x7;

		switch (pdev->device) {
		case PCI_DEVICE_ID_INTEL_KNL_IMC_MC:
			if (dev == 8)
				pvt->knl.pci_mc0 = pdev;
			else if (dev == 9)
				pvt->knl.pci_mc1 = pdev;
			else {
				sbridge_printk(KERN_ERR,
					"Memory controller in unexpected place! (dev %d, fn %d)\n",
					dev, func);
				continue;
			}
			break;

		case PCI_DEVICE_ID_INTEL_KNL_IMC_SAD0:
			pvt->pci_sad0 = pdev;
			break;

		case PCI_DEVICE_ID_INTEL_KNL_IMC_SAD1:
			pvt->pci_sad1 = pdev;
			break;

		case PCI_DEVICE_ID_INTEL_KNL_IMC_CHA:
			/* There are one of these per tile, and range from
			 * 1.14.0 to 1.18.5.
			 */
			devidx = ((dev-14)*8)+func;

			if (devidx < 0 || devidx >= KNL_MAX_CHAS) {
				sbridge_printk(KERN_ERR,
					"Caching and Home Agent in unexpected place! (dev %d, fn %d)\n",
					dev, func);
				continue;
			}

			WARN_ON(pvt->knl.pci_cha[devidx] != NULL);

			pvt->knl.pci_cha[devidx] = pdev;
			break;

		case PCI_DEVICE_ID_INTEL_KNL_IMC_CHAN:
			devidx = -1;

			/*
			 *  MC0 channels 0-2 are device 9 function 2-4,
			 *  MC1 channels 3-5 are device 8 function 2-4.
			 */

			if (dev == 9)
				devidx = func-2;
			else if (dev == 8)
				devidx = 3 + (func-2);

			if (devidx < 0 || devidx >= KNL_MAX_CHANNELS) {
				sbridge_printk(KERN_ERR,
					"DRAM Channel Registers in unexpected place! (dev %d, fn %d)\n",
					dev, func);
				continue;
			}

			WARN_ON(pvt->knl.pci_channel[devidx] != NULL);
			pvt->knl.pci_channel[devidx] = pdev;
			break;

		case PCI_DEVICE_ID_INTEL_KNL_IMC_TOLHM:
			pvt->knl.pci_mc_info = pdev;
			break;

		case PCI_DEVICE_ID_INTEL_KNL_IMC_TA:
			pvt->pci_ta = pdev;
			break;

		default:
			sbridge_printk(KERN_ERR, "Unexpected device %d\n",
				pdev->device);
			break;
		}
	}

	if (!pvt->knl.pci_mc0  || !pvt->knl.pci_mc1 ||
	    !pvt->pci_sad0     || !pvt->pci_sad1    ||
	    !pvt->pci_ta) {
		goto enodev;
	}

	for (i = 0; i < KNL_MAX_CHANNELS; i++) {
		if (!pvt->knl.pci_channel[i]) {
			sbridge_printk(KERN_ERR, "Missing channel %d\n", i);
			goto enodev;
		}
	}

	for (i = 0; i < KNL_MAX_CHAS; i++) {
		if (!pvt->knl.pci_cha[i]) {
			sbridge_printk(KERN_ERR, "Missing CHA %d\n", i);
			goto enodev;
		}
	}

	return 0;

enodev:
	sbridge_printk(KERN_ERR, "Some needed devices are missing\n");
	return -ENODEV;
}