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/*
* Copyright (C) 2016, Semihalf
* Author: Tomasz Nowicki <tn@semihalf.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* This file implements early detection/parsing of I/O mapping
* reported to OS through firmware via I/O Remapping Table (IORT)
* IORT document number: ARM DEN 0049A
*/
#define pr_fmt(fmt) "ACPI: IORT: " fmt
#include <linux/acpi_iort.h>
#include <linux/kernel.h>
#include <linux/pci.h>
typedef acpi_status (*iort_find_node_callback)
(struct acpi_iort_node *node, void *context);
/* Root pointer to the mapped IORT table */
static struct acpi_table_header *iort_table;
static LIST_HEAD(iort_msi_chip_list);
static DEFINE_SPINLOCK(iort_msi_chip_lock);
static struct acpi_iort_node *iort_scan_node(enum acpi_iort_node_type type,
iort_find_node_callback callback,
void *context)
{
struct acpi_iort_node *iort_node, *iort_end;
struct acpi_table_iort *iort;
int i;
if (!iort_table)
return NULL;
/* Get the first IORT node */
iort = (struct acpi_table_iort *)iort_table;
iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort,
iort->node_offset);
iort_end = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
iort_table->length);
for (i = 0; i < iort->node_count; i++) {
if (WARN_TAINT(iort_node >= iort_end, TAINT_FIRMWARE_WORKAROUND,
"IORT node pointer overflows, bad table!\n"))
return NULL;
if (iort_node->type == type &&
ACPI_SUCCESS(callback(iort_node, context)))
return iort_node;
iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort_node,
iort_node->length);
}
return NULL;
}
static acpi_status iort_match_node_callback(struct acpi_iort_node *node,
void *context)
{
struct device *dev = context;
acpi_status status;
if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT) {
struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_device *adev = to_acpi_device_node(dev->fwnode);
struct acpi_iort_named_component *ncomp;
if (!adev) {
status = AE_NOT_FOUND;
goto out;
}
status = acpi_get_name(adev->handle, ACPI_FULL_PATHNAME, &buf);
if (ACPI_FAILURE(status)) {
dev_warn(dev, "Can't get device full path name\n");
goto out;
}
ncomp = (struct acpi_iort_named_component *)node->node_data;
status = !strcmp(ncomp->device_name, buf.pointer) ?
AE_OK : AE_NOT_FOUND;
acpi_os_free(buf.pointer);
} else if (node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
struct acpi_iort_root_complex *pci_rc;
struct pci_bus *bus;
bus = to_pci_bus(dev);
pci_rc = (struct acpi_iort_root_complex *)node->node_data;
/*
* It is assumed that PCI segment numbers maps one-to-one
* with root complexes. Each segment number can represent only
* one root complex.
*/
status = pci_rc->pci_segment_number == pci_domain_nr(bus) ?
AE_OK : AE_NOT_FOUND;
} else {
status = AE_NOT_FOUND;
}
out:
return status;
}
static int iort_id_map(struct acpi_iort_id_mapping *map, u8 type, u32 rid_in,
u32 *rid_out)
{
/* Single mapping does not care for input id */
if (map->flags & ACPI_IORT_ID_SINGLE_MAPPING) {
if (type == ACPI_IORT_NODE_NAMED_COMPONENT ||
type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
*rid_out = map->output_base;
return 0;
}
pr_warn(FW_BUG "[map %p] SINGLE MAPPING flag not allowed for node type %d, skipping ID map\n",
map, type);
return -ENXIO;
}
if (rid_in < map->input_base ||
(rid_in >= map->input_base + map->id_count))
return -ENXIO;
*rid_out = map->output_base + (rid_in - map->input_base);
return 0;
}
static struct acpi_iort_node *iort_node_map_rid(struct acpi_iort_node *node,
u32 rid_in, u32 *rid_out,
u8 type)
{
u32 rid = rid_in;
/* Parse the ID mapping tree to find specified node type */
while (node) {
struct acpi_iort_id_mapping *map;
int i;
if (node->type == type) {
if (rid_out)
*rid_out = rid;
return node;
}
if (!node->mapping_offset || !node->mapping_count)
goto fail_map;
map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,
node->mapping_offset);
/* Firmware bug! */
if (!map->output_reference) {
pr_err(FW_BUG "[node %p type %d] ID map has NULL parent reference\n",
node, node->type);
goto fail_map;
}
/* Do the RID translation */
for (i = 0; i < node->mapping_count; i++, map++) {
if (!iort_id_map(map, node->type, rid, &rid))
break;
}
if (i == node->mapping_count)
goto fail_map;
node = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
map->output_reference);
}
fail_map:
/* Map input RID to output RID unchanged on mapping failure*/
if (rid_out)
*rid_out = rid_in;
return NULL;
}
static struct acpi_iort_node *iort_find_dev_node(struct device *dev)
{
struct pci_bus *pbus;
if (!dev_is_pci(dev))
return iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
iort_match_node_callback, dev);
/* Find a PCI root bus */
pbus = to_pci_dev(dev)->bus;
while (!pci_is_root_bus(pbus))
pbus = pbus->parent;
return iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
iort_match_node_callback, &pbus->dev);
}
void __init acpi_iort_init(void)
{
acpi_status status;
status = acpi_get_table(ACPI_SIG_IORT, 0, &iort_table);
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
const char *msg = acpi_format_exception(status);
pr_err("Failed to get table, %s\n", msg);
}
}
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