int cxl_of_read_afu_properties()

in cxl/of.c [140:281]

• 111 lines of code
• 20 McCabe index (conditional complexity)

int cxl_of_read_afu_properties(struct cxl_afu *afu, struct device_node *np)
{
	int i, len, rc;
	char *p;
	const __be32 *prop;
	u16 device_id, vendor_id;
	u32 val = 0, class_code;

	/* Properties are read in the same order as listed in PAPR */

	if (cxl_verbose) {
		pr_info("Dump of the 'ibm,coherent-platform-function' node properties:\n");

		prop = of_get_property(np, "compatible", &len);
		i = 0;
		while (i < len) {
			p = (char *) prop + i;
			pr_info("compatible: %s\n", p);
			i += strlen(p) + 1;
		}
		read_prop_string(np, "name");
	}

	rc = read_phys_addr(np, "reg", afu);
	if (rc)
		return rc;

	rc = read_phys_addr(np, "assigned-addresses", afu);
	if (rc)
		return rc;

	if (afu->psn_phys == 0)
		afu->psa = false;
	else
		afu->psa = true;

	if (cxl_verbose) {
		read_prop_string(np, "ibm,loc-code");
		read_prop_string(np, "device_type");
	}

	read_prop_dword(np, "ibm,#processes", &afu->max_procs_virtualised);

	if (cxl_verbose) {
		read_prop_dword(np, "ibm,scratchpad-size", &val);
		read_prop_dword(np, "ibm,programmable", &val);
		read_prop_string(np, "ibm,phandle");
		read_vpd(NULL, afu);
	}

	read_prop_dword(np, "ibm,max-ints-per-process", &afu->guest->max_ints);
	afu->irqs_max = afu->guest->max_ints;

	prop = read_prop_dword(np, "ibm,min-ints-per-process", &afu->pp_irqs);
	if (prop) {
		/* One extra interrupt for the PSL interrupt is already
		 * included. Remove it now to keep only AFU interrupts and
		 * match the native case.
		 */
		afu->pp_irqs--;
	}

	if (cxl_verbose) {
		read_prop_dword(np, "ibm,max-ints", &val);
		read_prop_dword(np, "ibm,vpd-size", &val);
	}

	read_prop64_dword(np, "ibm,error-buffer-size", &afu->eb_len);
	afu->eb_offset = 0;

	if (cxl_verbose)
		read_prop_dword(np, "ibm,config-record-type", &val);

	read_prop64_dword(np, "ibm,config-record-size", &afu->crs_len);
	afu->crs_offset = 0;

	read_prop_dword(np, "ibm,#config-records", &afu->crs_num);

	if (cxl_verbose) {
		for (i = 0; i < afu->crs_num; i++) {
			rc = cxl_ops->afu_cr_read16(afu, i, PCI_DEVICE_ID,
						&device_id);
			if (!rc)
				pr_info("record %d - device-id: %#x\n",
					i, device_id);
			rc = cxl_ops->afu_cr_read16(afu, i, PCI_VENDOR_ID,
						&vendor_id);
			if (!rc)
				pr_info("record %d - vendor-id: %#x\n",
					i, vendor_id);
			rc = cxl_ops->afu_cr_read32(afu, i, PCI_CLASS_REVISION,
						&class_code);
			if (!rc) {
				class_code >>= 8;
				pr_info("record %d - class-code: %#x\n",
					i, class_code);
			}
		}

		read_prop_dword(np, "ibm,function-number", &val);
		read_prop_dword(np, "ibm,privileged-function", &val);
		read_prop_dword(np, "vendor-id", &val);
		read_prop_dword(np, "device-id", &val);
		read_prop_dword(np, "revision-id", &val);
		read_prop_dword(np, "class-code", &val);
		read_prop_dword(np, "subsystem-vendor-id", &val);
		read_prop_dword(np, "subsystem-id", &val);
	}
	/*
	 * if "ibm,process-mmio" doesn't exist then per-process mmio is
	 * not supported
	 */
	val = 0;
	prop = read_prop_dword(np, "ibm,process-mmio", &val);
	if (prop && val == 1)
		afu->pp_psa = true;
	else
		afu->pp_psa = false;

	if (cxl_verbose) {
		read_prop_dword(np, "ibm,supports-aur", &val);
		read_prop_dword(np, "ibm,supports-csrp", &val);
		read_prop_dword(np, "ibm,supports-prr", &val);
	}

	prop = read_prop_dword(np, "ibm,function-error-interrupt", &val);
	if (prop)
		afu->serr_hwirq = val;

	pr_devel("AFU handle: %#llx\n", afu->guest->handle);
	pr_devel("p2n_phys: %#llx (size %#llx)\n",
		afu->guest->p2n_phys, afu->guest->p2n_size);
	pr_devel("psn_phys: %#llx (size %#llx)\n",
		afu->psn_phys, afu->adapter->ps_size);
	pr_devel("Max number of processes virtualised=%i\n",
		afu->max_procs_virtualised);
	pr_devel("Per-process irqs min=%i, max=%i\n", afu->pp_irqs,
		 afu->irqs_max);
	pr_devel("Slice error interrupt=%#lx\n", afu->serr_hwirq);

	return 0;
}