pci_routing_info.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <amdblocks/amd_pci_util.h>
#include <console/console.h>
#include <device/pci_def.h>
#include <fsp/util.h>
#include <FspGuids.h>
#include <types.h>
 
const struct pci_routing_info *get_pci_routing_table(size_t *entries)
{
        static const struct pci_routing_info *routing_table;
        static size_t routing_table_entries;
        size_t hob_size = 0;
        const struct {
                uint32_t num_of_entries;
                struct pci_routing_info routing_table[];
        } __packed *routing_hob;
 
        if (routing_table) {
                *entries = routing_table_entries;
                return routing_table;
        }
 
        routing_hob = fsp_find_extension_hob_by_guid(AMD_FSP_PCIE_DEVFUNC_REMAP_HOB_GUID.b,
                                                       &hob_size);
 
        if (routing_hob == NULL || hob_size == 0 || routing_hob->num_of_entries == 0) {
                printk(BIOS_ERR, "Couldn't find valid PCIe interrupt routing HOB.\n");
                return NULL;
        }
 
        routing_table = routing_hob->routing_table;
        routing_table_entries = routing_hob->num_of_entries;
 
        for (size_t i = 0; i < routing_table_entries; ++i) {
                printk(BIOS_DEBUG, "%02x.%x: group: %u, swizzle: %u, irq: %u\n",
                       PCI_SLOT(routing_table[i].devfn), PCI_FUNC(routing_table[i].devfn),
                       routing_table[i].group, routing_table[i].swizzle, routing_table[i].irq);
        }
 
        *entries = routing_table_entries;
 
        return routing_table;
}