static int cxl_parse_cfmws()

in acpi.c [80:133]

• 47 lines of code
• 6 McCabe index (conditional complexity)

static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg,
			   const unsigned long end)
{
	int target_map[CXL_DECODER_MAX_INTERLEAVE];
	struct cxl_cfmws_context *ctx = arg;
	struct cxl_port *root_port = ctx->root_port;
	struct device *dev = ctx->dev;
	struct acpi_cedt_cfmws *cfmws;
	struct cxl_decoder *cxld;
	int rc, i;

	cfmws = (struct acpi_cedt_cfmws *) header;

	rc = cxl_acpi_cfmws_verify(dev, cfmws);
	if (rc) {
		dev_err(dev, "CFMWS range %#llx-%#llx not registered\n",
			cfmws->base_hpa,
			cfmws->base_hpa + cfmws->window_size - 1);
		return 0;
	}

	for (i = 0; i < CFMWS_INTERLEAVE_WAYS(cfmws); i++)
		target_map[i] = cfmws->interleave_targets[i];

	cxld = cxl_decoder_alloc(root_port, CFMWS_INTERLEAVE_WAYS(cfmws));
	if (IS_ERR(cxld))
		return 0;

	cxld->flags = cfmws_to_decoder_flags(cfmws->restrictions);
	cxld->target_type = CXL_DECODER_EXPANDER;
	cxld->range = (struct range){
		.start = cfmws->base_hpa,
		.end = cfmws->base_hpa + cfmws->window_size - 1,
	};
	cxld->interleave_ways = CFMWS_INTERLEAVE_WAYS(cfmws);
	cxld->interleave_granularity = CFMWS_INTERLEAVE_GRANULARITY(cfmws);

	rc = cxl_decoder_add(cxld, target_map);
	if (rc)
		put_device(&cxld->dev);
	else
		rc = cxl_decoder_autoremove(dev, cxld);
	if (rc) {
		dev_err(dev, "Failed to add decoder for %#llx-%#llx\n",
			cfmws->base_hpa,
			cfmws->base_hpa + cfmws->window_size - 1);
		return 0;
	}
	dev_dbg(dev, "add: %s node: %d range %#llx-%#llx\n",
		dev_name(&cxld->dev), phys_to_target_node(cxld->range.start),
		cfmws->base_hpa, cfmws->base_hpa + cfmws->window_size - 1);

	return 0;
}