[mirror_ubuntu-jammy-kernel.git] / drivers / pci / host-bridge.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Host bridge related code
 */

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/module.h>

#include "pci.h"

static struct pci_bus *find_pci_root_bus(struct pci_bus *bus)
{
	while (bus->parent)
		bus = bus->parent;

	return bus;
}

struct pci_host_bridge *pci_find_host_bridge(struct pci_bus *bus)
{
	struct pci_bus *root_bus = find_pci_root_bus(bus);

	return to_pci_host_bridge(root_bus->bridge);
}

struct device *pci_get_host_bridge_device(struct pci_dev *dev)
{
	struct pci_bus *root_bus = find_pci_root_bus(dev->bus);
	struct device *bridge = root_bus->bridge;

	kobject_get(&bridge->kobj);
	return bridge;
}

void  pci_put_host_bridge_device(struct device *dev)
{
	kobject_put(&dev->kobj);
}

void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
				 void (*release_fn)(struct pci_host_bridge *),
				 void *release_data)
{
	bridge->release_fn = release_fn;
	bridge->release_data = release_data;
}
EXPORT_SYMBOL_GPL(pci_set_host_bridge_release);

void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
			     struct resource *res)
{
	struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
	struct resource_entry *window;
	resource_size_t offset = 0;

	resource_list_for_each_entry(window, &bridge->windows) {
		if (resource_contains(window->res, res)) {
			offset = window->offset;
			break;
		}
	}

	region->start = res->start - offset;
	region->end = res->end - offset;
}
EXPORT_SYMBOL(pcibios_resource_to_bus);

static bool region_contains(struct pci_bus_region *region1,
			    struct pci_bus_region *region2)
{
	return region1->start <= region2->start && region1->end >= region2->end;
}

void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
			     struct pci_bus_region *region)
{
	struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
	struct resource_entry *window;
	resource_size_t offset = 0;

	resource_list_for_each_entry(window, &bridge->windows) {
		struct pci_bus_region bus_region;

		if (resource_type(res) != resource_type(window->res))
			continue;

		bus_region.start = window->res->start - window->offset;
		bus_region.end = window->res->end - window->offset;

		if (region_contains(&bus_region, region)) {
			offset = window->offset;
			break;
		}
	}

	res->start = region->start + offset;
	res->end = region->end + offset;
}
EXPORT_SYMBOL(pcibios_bus_to_resource);
Commit	Line	Data
7328c8f4	1	// SPDX-License-Identifier: GPL-2.0
610929e1	2	/*
df62ab5e	3	* Host bridge related code
610929e1 YL	4	*/
	5
	6	#include <linux/kernel.h>
610929e1 YL	7	#include <linux/pci.h>
	8	#include <linux/module.h>
	9
	10	#include "pci.h"
	11
fc279850	12	static struct pci_bus find_pci_root_bus(struct pci_bus bus)
610929e1	13	{
610929e1 YL	14	while (bus->parent)
	15	bus = bus->parent;
	16
459f58ce YL	17	return bus;
	18	}
	19
3390e085	20	struct pci_host_bridge pci_find_host_bridge(struct pci_bus bus)
459f58ce	21	{
fc279850	22	struct pci_bus *root_bus = find_pci_root_bus(bus);
610929e1	23
fc279850	24	return to_pci_host_bridge(root_bus->bridge);
610929e1 YL	25	}
610929e1 YL	26
6675a601 MK	27	struct device pci_get_host_bridge_device(struct pci_dev dev)
	28	{
	29	struct pci_bus *root_bus = find_pci_root_bus(dev->bus);
	30	struct device *bridge = root_bus->bridge;
	31
	32	kobject_get(&bridge->kobj);
	33	return bridge;
	34	}
	35
	36	void pci_put_host_bridge_device(struct device *dev)
	37	{
	38	kobject_put(&dev->kobj);
	39	}
	40
4fa2649a YL	41	void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
	42	void (release_fn)(struct pci_host_bridge ),
	43	void *release_data)
	44	{
	45	bridge->release_fn = release_fn;
	46	bridge->release_data = release_data;
	47	}
6f38a8b9	48	EXPORT_SYMBOL_GPL(pci_set_host_bridge_release);
4fa2649a	49
fc279850	50	void pcibios_resource_to_bus(struct pci_bus bus, struct pci_bus_region region,
610929e1 YL	51	struct resource *res)
610929e1 YL	52	{
3390e085	53	struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
14d76b68	54	struct resource_entry *window;
610929e1 YL	55	resource_size_t offset = 0;
610929e1 YL	56
14d76b68	57	resource_list_for_each_entry(window, &bridge->windows) {
610929e1 YL	58	if (resource_contains(window->res, res)) {
	59	offset = window->offset;
	60	break;
	61	}
	62	}
	63
	64	region->start = res->start - offset;
	65	region->end = res->end - offset;
	66	}
	67	EXPORT_SYMBOL(pcibios_resource_to_bus);
	68
	69	static bool region_contains(struct pci_bus_region *region1,
	70	struct pci_bus_region *region2)
	71	{
	72	return region1->start <= region2->start && region1->end >= region2->end;
	73	}
	74
fc279850	75	void pcibios_bus_to_resource(struct pci_bus bus, struct resource res,
610929e1 YL	76	struct pci_bus_region *region)
610929e1 YL	77	{
3390e085	78	struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
14d76b68	79	struct resource_entry *window;
610929e1 YL	80	resource_size_t offset = 0;
610929e1 YL	81
14d76b68	82	resource_list_for_each_entry(window, &bridge->windows) {
459f58ce YL	83	struct pci_bus_region bus_region;
459f58ce YL	84
610929e1 YL	85	if (resource_type(res) != resource_type(window->res))
	86	continue;
	87
	88	bus_region.start = window->res->start - window->offset;
	89	bus_region.end = window->res->end - window->offset;
	90
	91	if (region_contains(&bus_region, region)) {
	92	offset = window->offset;
	93	break;
	94	}
	95	}
	96
	97	res->start = region->start + offset;
	98	res->end = region->end + offset;
	99	}
	100	EXPORT_SYMBOL(pcibios_bus_to_resource);