[qemu.git] / hw / pci / pci_bridge.c

/*
 * QEMU PCI bus manager
 *
 * Copyright (c) 2004 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to dea

 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
/*
 * split out from pci.c
 * Copyright (c) 2010 Isaku Yamahata <yamahata at valinux co jp>
 *                    VA Linux Systems Japan K.K.
 */

#include "hw/pci/pci_bridge.h"
#include "hw/pci/pci_bus.h"
#include "qemu/range.h"

/* PCI bridge subsystem vendor ID helper functions */
#define PCI_SSVID_SIZEOF        8
#define PCI_SSVID_SVID          4
#define PCI_SSVID_SSID          6

int pci_bridge_ssvid_init(PCIDevice *dev, uint8_t offset,
                          uint16_t svid, uint16_t ssid)
{
    int pos;
    pos = pci_add_capability(dev, PCI_CAP_ID_SSVID, offset, PCI_SSVID_SIZEOF);
    if (pos < 0) {
        return pos;
    }

    pci_set_word(dev->config + pos + PCI_SSVID_SVID, svid);
    pci_set_word(dev->config + pos + PCI_SSVID_SSID, ssid);
    return pos;
}

/* Accessor function to get parent bridge device from pci bus. */
PCIDevice *pci_bridge_get_device(PCIBus *bus)
{
    return bus->parent_dev;
}

/* Accessor function to get secondary bus from pci-to-pci bridge device */
PCIBus *pci_bridge_get_sec_bus(PCIBridge *br)
{
    return &br->sec_bus;
}

static uint32_t pci_config_get_io_base(const PCIDevice *d,
                                       uint32_t base, uint32_t base_upper16)
{
    uint32_t val;

    val = ((uint32_t)d->config[base] & PCI_IO_RANGE_MASK) << 8;
    if (d->config[base] & PCI_IO_RANGE_TYPE_32) {
        val |= (uint32_t)pci_get_word(d->config + base_upper16) << 16;
    }
    return val;
}

static pcibus_t pci_config_get_memory_base(const PCIDevice *d, uint32_t base)
{
    return ((pcibus_t)pci_get_word(d->config + base) & PCI_MEMORY_RANGE_MASK)
        << 16;
}

static pcibus_t pci_config_get_pref_base(const PCIDevice *d,
                                         uint32_t base, uint32_t upper)
{
    pcibus_t tmp;
    pcibus_t val;

    tmp = (pcibus_t)pci_get_word(d->config + base);
    val = (tmp & PCI_PREF_RANGE_MASK) << 16;
    if (tmp & PCI_PREF_RANGE_TYPE_64) {
        val |= (pcibus_t)pci_get_long(d->config + upper) << 32;
    }
    return val;
}

/* accessor function to get bridge filtering base address */
pcibus_t pci_bridge_get_base(const PCIDevice *bridge, uint8_t type)
{
    pcibus_t base;
    if (type & PCI_BASE_ADDRESS_SPACE_IO) {
        base = pci_config_get_io_base(bridge,
                                      PCI_IO_BASE, PCI_IO_BASE_UPPER16);
    } else {
        if (type & PCI_BASE_ADDRESS_MEM_PREFETCH) {
            base = pci_config_get_pref_base(
                bridge, PCI_PREF_MEMORY_BASE, PCI_PREF_BASE_UPPER32);
        } else {
            base = pci_config_get_memory_base(bridge, PCI_MEMORY_BASE);
        }
    }

    return base;
}

/* accessor funciton to get bridge filtering limit */
pcibus_t pci_bridge_get_limit(const PCIDevice *bridge, uint8_t type)
{
    pcibus_t limit;
    if (type & PCI_BASE_ADDRESS_SPACE_IO) {
        limit = pci_config_get_io_base(bridge,
                                      PCI_IO_LIMIT, PCI_IO_LIMIT_UPPER16);
        limit |= 0xfff;         /* PCI bridge spec 3.2.5.6. */
    } else {
        if (type & PCI_BASE_ADDRESS_MEM_PREFETCH) {
            limit = pci_config_get_pref_base(
                bridge, PCI_PREF_MEMORY_LIMIT, PCI_PREF_LIMIT_UPPER32);
        } else {
            limit = pci_config_get_memory_base(bridge, PCI_MEMORY_LIMIT);
        }
        limit |= 0xfffff;       /* PCI bridge spec 3.2.5.{1, 8}. */
    }
    return limit;
}

static void pci_bridge_init_alias(PCIBridge *bridge, MemoryRegion *alias,
                                  uint8_t type, const char *name,
                                  MemoryRegion *space,
                                  MemoryRegion *parent_space,
                                  bool enabled)
{
    PCIDevice *bridge_dev = PCI_DEVICE(bridge);
    pcibus_t base = pci_bridge_get_base(bridge_dev, type);
    pcibus_t limit = pci_bridge_get_limit(bridge_dev, type);
    /* TODO: this doesn't handle base = 0 limit = 2^64 - 1 correctly.
     * Apparently no way to do this with existing memory APIs. */
    pcibus_t size = enabled && limit >= base ? limit + 1 - base : 0;

    memory_region_init_alias(alias, OBJECT(bridge), name, space, base, size);
    memory_region_add_subregion_overlap(parent_space, base, alias, 1);
}

static void pci_bridge_init_vga_aliases(PCIBridge *br, PCIBus *parent,
                                        MemoryRegion *alias_vga)
{
    PCIDevice *pd = PCI_DEVICE(br);
    uint16_t brctl = pci_get_word(pd->config + PCI_BRIDGE_CONTROL);

    memory_region_init_alias(&alias_vga[QEMU_PCI_VGA_IO_LO], OBJECT(br),
                             "pci_bridge_vga_io_lo", &br->address_space_io,
                             QEMU_PCI_VGA_IO_LO_BASE, QEMU_PCI_VGA_IO_LO_SIZE);
    memory_region_init_alias(&alias_vga[QEMU_PCI_VGA_IO_HI], OBJECT(br),
                             "pci_bridge_vga_io_hi", &br->address_space_io,
                             QEMU_PCI_VGA_IO_HI_BASE, QEMU_PCI_VGA_IO_HI_SIZE);
    memory_region_init_alias(&alias_vga[QEMU_PCI_VGA_MEM], OBJECT(br),
                             "pci_bridge_vga_mem", &br->address_space_mem,
                             QEMU_PCI_VGA_MEM_BASE, QEMU_PCI_VGA_MEM_SIZE);

    if (brctl & PCI_BRIDGE_CTL_VGA) {
        pci_register_vga(pd, &alias_vga[QEMU_PCI_VGA_MEM],
                         &alias_vga[QEMU_PCI_VGA_IO_LO],
                         &alias_vga[QEMU_PCI_VGA_IO_HI]);
    }
}

static PCIBridgeWindows *pci_bridge_region_init(PCIBridge *br)
{
    PCIDevice *pd = PCI_DEVICE(br);
    PCIBus *parent = pd->bus;
    PCIBridgeWindows *w = g_new(PCIBridgeWindows, 1);
    uint16_t cmd = pci_get_word(pd->config + PCI_COMMAND);

    pci_bridge_init_alias(br, &w->alias_pref_mem,
                          PCI_BASE_ADDRESS_MEM_PREFETCH,
                          "pci_bridge_pref_mem",
                          &br->address_space_mem,
                          parent->address_space_mem,
                          cmd & PCI_COMMAND_MEMORY);
    pci_bridge_init_alias(br, &w->alias_mem,
                          PCI_BASE_ADDRESS_SPACE_MEMORY,
                          "pci_bridge_mem",
                          &br->address_space_mem,
                          parent->address_space_mem,
                          cmd & PCI_COMMAND_MEMORY);
    pci_bridge_init_alias(br, &w->alias_io,
                          PCI_BASE_ADDRESS_SPACE_IO,
                          "pci_bridge_io",
                          &br->address_space_io,
                          parent->address_space_io,
                          cmd & PCI_COMMAND_IO);

    pci_bridge_init_vga_aliases(br, parent, w->alias_vga);

    return w;
}

static void pci_bridge_region_del(PCIBridge *br, PCIBridgeWindows *w)
{
    PCIDevice *pd = PCI_DEVICE(br);
    PCIBus *parent = pd->bus;

    memory_region_del_subregion(parent->address_space_io, &w->alias_io);
    memory_region_del_subregion(parent->address_space_mem, &w->alias_mem);
    memory_region_del_subregion(parent->address_space_mem, &w->alias_pref_mem);
    pci_unregister_vga(pd);
}

static void pci_bridge_region_cleanup(PCIBridge *br, PCIBridgeWindows *w)
{
    memory_region_destroy(&w->alias_io);
    memory_region_destroy(&w->alias_mem);
    memory_region_destroy(&w->alias_pref_mem);
    memory_region_destroy(&w->alias_vga[QEMU_PCI_VGA_IO_LO]);
    memory_region_destroy(&w->alias_vga[QEMU_PCI_VGA_IO_HI]);
    memory_region_destroy(&w->alias_vga[QEMU_PCI_VGA_MEM]);
    g_free(w);
}

void pci_bridge_update_mappings(PCIBridge *br)
{
    PCIBridgeWindows *w = br->windows;

    /* Make updates atomic to: handle the case of one VCPU updating the bridge
     * while another accesses an unaffected region. */
    memory_region_transaction_begin();
    pci_bridge_region_del(br, br->windows);
    br->windows = pci_bridge_region_init(br);
    memory_region_transaction_commit();
    pci_bridge_region_cleanup(br, w);
}

/* default write_config function for PCI-to-PCI bridge */
void pci_bridge_write_config(PCIDevice *d,
                             uint32_t address, uint32_t val, int len)
{
    PCIBridge *s = PCI_BRIDGE(d);
    uint16_t oldctl = pci_get_word(d->config + PCI_BRIDGE_CONTROL);
    uint16_t newctl;

    pci_default_write_config(d, address, val, len);

    if (ranges_overlap(address, len, PCI_COMMAND, 2) ||

        /* io base/limit */
        ranges_overlap(address, len, PCI_IO_BASE, 2) ||

        /* memory base/limit, prefetchable base/limit and
           io base/limit upper 16 */
        ranges_overlap(address, len, PCI_MEMORY_BASE, 20) ||

        /* vga enable */
        ranges_overlap(address, len, PCI_BRIDGE_CONTROL, 2)) {
        pci_bridge_update_mappings(s);
    }

    newctl = pci_get_word(d->config + PCI_BRIDGE_CONTROL);
    if (~oldctl & newctl & PCI_BRIDGE_CTL_BUS_RESET) {
        /* Trigger hot reset on 0->1 transition. */
        qbus_reset_all(&s->sec_bus.qbus);
    }
}

void pci_bridge_disable_base_limit(PCIDevice *dev)
{
    uint8_t *conf = dev->config;

    pci_byte_test_and_set_mask(conf + PCI_IO_BASE,
                               PCI_IO_RANGE_MASK & 0xff);
    pci_byte_test_and_clear_mask(conf + PCI_IO_LIMIT,
                                 PCI_IO_RANGE_MASK & 0xff);
    pci_word_test_and_set_mask(conf + PCI_MEMORY_BASE,
                               PCI_MEMORY_RANGE_MASK & 0xffff);
    pci_word_test_and_clear_mask(conf + PCI_MEMORY_LIMIT,
                                 PCI_MEMORY_RANGE_MASK & 0xffff);
    pci_word_test_and_set_mask(conf + PCI_PREF_MEMORY_BASE,
                               PCI_PREF_RANGE_MASK & 0xffff);
    pci_word_test_and_clear_mask(conf + PCI_PREF_MEMORY_LIMIT,
                                 PCI_PREF_RANGE_MASK & 0xffff);
    pci_set_long(conf + PCI_PREF_BASE_UPPER32, 0);
    pci_set_long(conf + PCI_PREF_LIMIT_UPPER32, 0);
}

/* reset bridge specific configuration registers */
void pci_bridge_reset(DeviceState *qdev)
{
    PCIDevice *dev = PCI_DEVICE(qdev);
    uint8_t *conf = dev->config;

    conf[PCI_PRIMARY_BUS] = 0;
    conf[PCI_SECONDARY_BUS] = 0;
    conf[PCI_SUBORDINATE_BUS] = 0;
    conf[PCI_SEC_LATENCY_TIMER] = 0;

    /*
     * the default values for base/limit registers aren't specified
     * in the PCI-to-PCI-bridge spec. So we don't thouch them here.
     * Each implementation can override it.
     * typical implementation does
     * zero base/limit registers or
     * disable forwarding: pci_bridge_disable_base_limit()
     * If disable forwarding is wanted, call pci_bridge_disable_base_limit()
     * after this function.
     */
    pci_byte_test_and_clear_mask(conf + PCI_IO_BASE,
                                 PCI_IO_RANGE_MASK & 0xff);
    pci_byte_test_and_clear_mask(conf + PCI_IO_LIMIT,
                                 PCI_IO_RANGE_MASK & 0xff);
    pci_word_test_and_clear_mask(conf + PCI_MEMORY_BASE,
                                 PCI_MEMORY_RANGE_MASK & 0xffff);
    pci_word_test_and_clear_mask(conf + PCI_MEMORY_LIMIT,
                                 PCI_MEMORY_RANGE_MASK & 0xffff);
    pci_word_test_and_clear_mask(conf + PCI_PREF_MEMORY_BASE,
                                 PCI_PREF_RANGE_MASK & 0xffff);
    pci_word_test_and_clear_mask(conf + PCI_PREF_MEMORY_LIMIT,
                                 PCI_PREF_RANGE_MASK & 0xffff);
    pci_set_long(conf + PCI_PREF_BASE_UPPER32, 0);
    pci_set_long(conf + PCI_PREF_LIMIT_UPPER32, 0);

    pci_set_word(conf + PCI_BRIDGE_CONTROL, 0);
}

/* default qdev initialization function for PCI-to-PCI bridge */
int pci_bridge_initfn(PCIDevice *dev, const char *typename)
{
    PCIBus *parent = dev->bus;
    PCIBridge *br = PCI_BRIDGE(dev);
    PCIBus *sec_bus = &br->sec_bus;

    pci_word_test_and_set_mask(dev->config + PCI_STATUS,
                               PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK);

    /*
     * TODO: We implement VGA Enable in the Bridge Control Register
     * therefore per the PCI to PCI bridge spec we must also implement
     * VGA Palette Snooping.  When done, set this bit writable:
     *
     * pci_word_test_and_set_mask(dev->wmask + PCI_COMMAND,
     *                            PCI_COMMAND_VGA_PALETTE);
     */

    pci_config_set_class(dev->config, PCI_CLASS_BRIDGE_PCI);
    dev->config[PCI_HEADER_TYPE] =
        (dev->config[PCI_HEADER_TYPE] & PCI_HEADER_TYPE_MULTI_FUNCTION) |
        PCI_HEADER_TYPE_BRIDGE;
    pci_set_word(dev->config + PCI_SEC_STATUS,
                 PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK);

    /*
     * If we don't specify the name, the bus will be addressed as <id>.0, where
     * id is the device id.
     * Since PCI Bridge devices have a single bus each, we don't need the index:
     * let users address the bus using the device name.
     */
    if (!br->bus_name && dev->qdev.id && *dev->qdev.id) {
	    br->bus_name = dev->qdev.id;
    }

    qbus_create_inplace(sec_bus, sizeof(br->sec_bus), typename, DEVICE(dev),
                        br->bus_name);
    sec_bus->parent_dev = dev;
    sec_bus->map_irq = br->map_irq ? br->map_irq : pci_swizzle_map_irq_fn;
    sec_bus->address_space_mem = &br->address_space_mem;
    memory_region_init(&br->address_space_mem, OBJECT(br), "pci_bridge_pci", UINT64_MAX);
    sec_bus->address_space_io = &br->address_space_io;
    memory_region_init(&br->address_space_io, OBJECT(br), "pci_bridge_io", 65536);
    br->windows = pci_bridge_region_init(br);
    QLIST_INIT(&sec_bus->child);
    QLIST_INSERT_HEAD(&parent->child, sec_bus, sibling);
    return 0;
}

/* default qdev clean up function for PCI-to-PCI bridge */
void pci_bridge_exitfn(PCIDevice *pci_dev)
{
    PCIBridge *s = PCI_BRIDGE(pci_dev);
    assert(QLIST_EMPTY(&s->sec_bus.child));
    QLIST_REMOVE(&s->sec_bus, sibling);
    pci_bridge_region_del(s, s->windows);
    pci_bridge_region_cleanup(s, s->windows);
    memory_region_destroy(&s->address_space_mem);
    memory_region_destroy(&s->address_space_io);
    /* object_unparent() is called automatically during device deletion */
}

/*
 * before qdev initialization(qdev_init()), this function sets bus_name and
 * map_irq callback which are necessry for pci_bridge_initfn() to
 * initialize bus.
 */
void pci_bridge_map_irq(PCIBridge *br, const char* bus_name,
                        pci_map_irq_fn map_irq)
{
    br->map_irq = map_irq;
    br->bus_name = bus_name;
}

static const TypeInfo pci_bridge_type_info = {
    .name = TYPE_PCI_BRIDGE,
    .parent = TYPE_PCI_DEVICE,
    .instance_size = sizeof(PCIBridge),
    .abstract = true,
};

static void pci_bridge_register_types(void)
{
    type_register_static(&pci_bridge_type_info);
}

type_init(pci_bridge_register_types)
Commit	Line	Data
783753fd IY	1	/*
	2	* QEMU PCI bus manager
	3	*
	4	* Copyright (c) 2004 Fabrice Bellard
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a copy
	7	* of this software and associated documentation files (the "Software"), to dea
	8
	9	* in the Software without restriction, including without limitation the rights
	10	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	11	* copies of the Software, and to permit persons to whom the Software is
	12	* furnished to do so, subject to the following conditions:
	13	*
	14	* The above copyright notice and this permission notice shall be included in
	15	* all copies or substantial portions of the Software.
	16	*
	17	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	18	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	19	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	20	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	21	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM
	22
	23	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	24	* THE SOFTWARE.
	25	*/
	26	/*
	27	* split out from pci.c
	28	* Copyright (c) 2010 Isaku Yamahata <yamahata at valinux co jp>
	29	* VA Linux Systems Japan K.K.
	30	*/
	31
c759b24f	32	#include "hw/pci/pci_bridge.h"
06aac7bd	33	#include "hw/pci/pci_bus.h"
1de7afc9	34	#include "qemu/range.h"
783753fd	35
f4c817e0 IY	36	/* PCI bridge subsystem vendor ID helper functions */
	37	#define PCI_SSVID_SIZEOF 8
	38	#define PCI_SSVID_SVID 4
	39	#define PCI_SSVID_SSID 6
	40
	41	int pci_bridge_ssvid_init(PCIDevice *dev, uint8_t offset,
	42	uint16_t svid, uint16_t ssid)
	43	{
	44	int pos;
	45	pos = pci_add_capability(dev, PCI_CAP_ID_SSVID, offset, PCI_SSVID_SIZEOF);
	46	if (pos < 0) {
	47	return pos;
	48	}
	49
	50	pci_set_word(dev->config + pos + PCI_SSVID_SVID, svid);
	51	pci_set_word(dev->config + pos + PCI_SSVID_SSID, ssid);
	52	return pos;
	53	}
	54
68f79994	55	/* Accessor function to get parent bridge device from pci bus. */
783753fd IY	56	PCIDevice pci_bridge_get_device(PCIBus bus)
	57	{
	58	return bus->parent_dev;
	59	}
	60
68f79994 IY	61	/* Accessor function to get secondary bus from pci-to-pci bridge device */
	62	PCIBus pci_bridge_get_sec_bus(PCIBridge br)
	63	{
	64	return &br->sec_bus;
	65	}
	66
	67	static uint32_t pci_config_get_io_base(const PCIDevice *d,
783753fd IY	68	uint32_t base, uint32_t base_upper16)
	69	{
	70	uint32_t val;
	71
	72	val = ((uint32_t)d->config[base] & PCI_IO_RANGE_MASK) << 8;
	73	if (d->config[base] & PCI_IO_RANGE_TYPE_32) {
	74	val \|= (uint32_t)pci_get_word(d->config + base_upper16) << 16;
	75	}
	76	return val;
	77	}
	78
68f79994	79	static pcibus_t pci_config_get_memory_base(const PCIDevice *d, uint32_t base)
783753fd IY	80	{
	81	return ((pcibus_t)pci_get_word(d->config + base) & PCI_MEMORY_RANGE_MASK)
	82	<< 16;
	83	}
	84
68f79994	85	static pcibus_t pci_config_get_pref_base(const PCIDevice *d,
783753fd IY	86	uint32_t base, uint32_t upper)
	87	{
	88	pcibus_t tmp;
	89	pcibus_t val;
	90
	91	tmp = (pcibus_t)pci_get_word(d->config + base);
	92	val = (tmp & PCI_PREF_RANGE_MASK) << 16;
	93	if (tmp & PCI_PREF_RANGE_TYPE_64) {
	94	val \|= (pcibus_t)pci_get_long(d->config + upper) << 32;
	95	}
	96	return val;
	97	}
	98
68f79994 IY	99	/* accessor function to get bridge filtering base address */
68f79994 IY	100	pcibus_t pci_bridge_get_base(const PCIDevice *bridge, uint8_t type)
783753fd IY	101	{
	102	pcibus_t base;
	103	if (type & PCI_BASE_ADDRESS_SPACE_IO) {
	104	base = pci_config_get_io_base(bridge,
	105	PCI_IO_BASE, PCI_IO_BASE_UPPER16);
	106	} else {
	107	if (type & PCI_BASE_ADDRESS_MEM_PREFETCH) {
	108	base = pci_config_get_pref_base(
	109	bridge, PCI_PREF_MEMORY_BASE, PCI_PREF_BASE_UPPER32);
	110	} else {
	111	base = pci_config_get_memory_base(bridge, PCI_MEMORY_BASE);
	112	}
	113	}
	114
	115	return base;
	116	}
	117
68f79994 IY	118	/* accessor funciton to get bridge filtering limit */
68f79994 IY	119	pcibus_t pci_bridge_get_limit(const PCIDevice *bridge, uint8_t type)
783753fd IY	120	{
	121	pcibus_t limit;
	122	if (type & PCI_BASE_ADDRESS_SPACE_IO) {
	123	limit = pci_config_get_io_base(bridge,
	124	PCI_IO_LIMIT, PCI_IO_LIMIT_UPPER16);
	125	limit \|= 0xfff; /* PCI bridge spec 3.2.5.6. */
	126	} else {
	127	if (type & PCI_BASE_ADDRESS_MEM_PREFETCH) {
	128	limit = pci_config_get_pref_base(
	129	bridge, PCI_PREF_MEMORY_LIMIT, PCI_PREF_LIMIT_UPPER32);
	130	} else {
	131	limit = pci_config_get_memory_base(bridge, PCI_MEMORY_LIMIT);
	132	}
	133	limit \|= 0xfffff; /* PCI bridge spec 3.2.5.{1, 8}. */
	134	}
	135	return limit;
	136	}
	137
7df32ca0 MT	138	static void pci_bridge_init_alias(PCIBridge bridge, MemoryRegion alias,
	139	uint8_t type, const char *name,
	140	MemoryRegion *space,
	141	MemoryRegion *parent_space,
	142	bool enabled)
	143	{
f055e96b AF	144	PCIDevice *bridge_dev = PCI_DEVICE(bridge);
	145	pcibus_t base = pci_bridge_get_base(bridge_dev, type);
	146	pcibus_t limit = pci_bridge_get_limit(bridge_dev, type);
7df32ca0 MT	147	/* TODO: this doesn't handle base = 0 limit = 2^64 - 1 correctly.
	148	* Apparently no way to do this with existing memory APIs. */
	149	pcibus_t size = enabled && limit >= base ? limit + 1 - base : 0;
	150
40c5dce9	151	memory_region_init_alias(alias, OBJECT(bridge), name, space, base, size);
7df32ca0 MT	152	memory_region_add_subregion_overlap(parent_space, base, alias, 1);
	153	}
	154
ba7d8515 AW	155	static void pci_bridge_init_vga_aliases(PCIBridge br, PCIBus parent,
	156	MemoryRegion *alias_vga)
	157	{
f055e96b AF	158	PCIDevice *pd = PCI_DEVICE(br);
f055e96b AF	159	uint16_t brctl = pci_get_word(pd->config + PCI_BRIDGE_CONTROL);
ba7d8515	160
40c5dce9	161	memory_region_init_alias(&alias_vga[QEMU_PCI_VGA_IO_LO], OBJECT(br),
ba7d8515 AW	162	"pci_bridge_vga_io_lo", &br->address_space_io,
ba7d8515 AW	163	QEMU_PCI_VGA_IO_LO_BASE, QEMU_PCI_VGA_IO_LO_SIZE);
40c5dce9	164	memory_region_init_alias(&alias_vga[QEMU_PCI_VGA_IO_HI], OBJECT(br),
ba7d8515 AW	165	"pci_bridge_vga_io_hi", &br->address_space_io,
ba7d8515 AW	166	QEMU_PCI_VGA_IO_HI_BASE, QEMU_PCI_VGA_IO_HI_SIZE);
40c5dce9	167	memory_region_init_alias(&alias_vga[QEMU_PCI_VGA_MEM], OBJECT(br),
ba7d8515 AW	168	"pci_bridge_vga_mem", &br->address_space_mem,
	169	QEMU_PCI_VGA_MEM_BASE, QEMU_PCI_VGA_MEM_SIZE);
	170
	171	if (brctl & PCI_BRIDGE_CTL_VGA) {
f055e96b	172	pci_register_vga(pd, &alias_vga[QEMU_PCI_VGA_MEM],
ba7d8515 AW	173	&alias_vga[QEMU_PCI_VGA_IO_LO],
	174	&alias_vga[QEMU_PCI_VGA_IO_HI]);
	175	}
	176	}
	177
b308c82c	178	static PCIBridgeWindows pci_bridge_region_init(PCIBridge br)
7df32ca0	179	{
f055e96b AF	180	PCIDevice *pd = PCI_DEVICE(br);
f055e96b AF	181	PCIBus *parent = pd->bus;
b308c82c	182	PCIBridgeWindows *w = g_new(PCIBridgeWindows, 1);
f055e96b	183	uint16_t cmd = pci_get_word(pd->config + PCI_COMMAND);
7df32ca0	184
b308c82c	185	pci_bridge_init_alias(br, &w->alias_pref_mem,
7df32ca0 MT	186	PCI_BASE_ADDRESS_MEM_PREFETCH,
7df32ca0 MT	187	"pci_bridge_pref_mem",
336411ca	188	&br->address_space_mem,
7df32ca0 MT	189	parent->address_space_mem,
7df32ca0 MT	190	cmd & PCI_COMMAND_MEMORY);
b308c82c	191	pci_bridge_init_alias(br, &w->alias_mem,
7df32ca0 MT	192	PCI_BASE_ADDRESS_SPACE_MEMORY,
7df32ca0 MT	193	"pci_bridge_mem",
336411ca	194	&br->address_space_mem,
7df32ca0 MT	195	parent->address_space_mem,
7df32ca0 MT	196	cmd & PCI_COMMAND_MEMORY);
b308c82c	197	pci_bridge_init_alias(br, &w->alias_io,
7df32ca0 MT	198	PCI_BASE_ADDRESS_SPACE_IO,
7df32ca0 MT	199	"pci_bridge_io",
336411ca	200	&br->address_space_io,
7df32ca0 MT	201	parent->address_space_io,
7df32ca0 MT	202	cmd & PCI_COMMAND_IO);
ba7d8515 AW	203
ba7d8515 AW	204	pci_bridge_init_vga_aliases(br, parent, w->alias_vga);
b308c82c AK	205
b308c82c AK	206	return w;
7df32ca0 MT	207	}
7df32ca0 MT	208
b308c82c	209	static void pci_bridge_region_del(PCIBridge br, PCIBridgeWindows w)
7df32ca0	210	{
f055e96b AF	211	PCIDevice *pd = PCI_DEVICE(br);
f055e96b AF	212	PCIBus *parent = pd->bus;
b308c82c AK	213
	214	memory_region_del_subregion(parent->address_space_io, &w->alias_io);
	215	memory_region_del_subregion(parent->address_space_mem, &w->alias_mem);
	216	memory_region_del_subregion(parent->address_space_mem, &w->alias_pref_mem);
f055e96b	217	pci_unregister_vga(pd);
b308c82c AK	218	}
	219
	220	static void pci_bridge_region_cleanup(PCIBridge br, PCIBridgeWindows w)
	221	{
	222	memory_region_destroy(&w->alias_io);
	223	memory_region_destroy(&w->alias_mem);
	224	memory_region_destroy(&w->alias_pref_mem);
ba7d8515 AW	225	memory_region_destroy(&w->alias_vga[QEMU_PCI_VGA_IO_LO]);
	226	memory_region_destroy(&w->alias_vga[QEMU_PCI_VGA_IO_HI]);
	227	memory_region_destroy(&w->alias_vga[QEMU_PCI_VGA_MEM]);
b308c82c	228	g_free(w);
7df32ca0 MT	229	}
7df32ca0 MT	230
e78e9ae4	231	void pci_bridge_update_mappings(PCIBridge *br)
7df32ca0	232	{
b308c82c AK	233	PCIBridgeWindows *w = br->windows;
b308c82c AK	234
7df32ca0 MT	235	/* Make updates atomic to: handle the case of one VCPU updating the bridge
	236	* while another accesses an unaffected region. */
	237	memory_region_transaction_begin();
b308c82c AK	238	pci_bridge_region_del(br, br->windows);
b308c82c AK	239	br->windows = pci_bridge_region_init(br);
7df32ca0	240	memory_region_transaction_commit();
b308c82c	241	pci_bridge_region_cleanup(br, w);
7df32ca0 MT	242	}
7df32ca0 MT	243
68f79994 IY	244	/* default write_config function for PCI-to-PCI bridge */
68f79994 IY	245	void pci_bridge_write_config(PCIDevice *d,
783753fd IY	246	uint32_t address, uint32_t val, int len)
783753fd IY	247	{
f055e96b	248	PCIBridge *s = PCI_BRIDGE(d);
a5fce077 IY	249	uint16_t oldctl = pci_get_word(d->config + PCI_BRIDGE_CONTROL);
	250	uint16_t newctl;
	251
783753fd IY	252	pci_default_write_config(d, address, val, len);
783753fd IY	253
7df32ca0 MT	254	if (ranges_overlap(address, len, PCI_COMMAND, 2) \|\|
	255
	256	/* io base/limit */
783753fd IY	257	ranges_overlap(address, len, PCI_IO_BASE, 2) \|\|
	258
	259	/* memory base/limit, prefetchable base/limit and
	260	io base/limit upper 16 */
ba7d8515 AW	261	ranges_overlap(address, len, PCI_MEMORY_BASE, 20) \|\|
	262
	263	/* vga enable */
	264	ranges_overlap(address, len, PCI_BRIDGE_CONTROL, 2)) {
7df32ca0	265	pci_bridge_update_mappings(s);
783753fd	266	}
a5fce077 IY	267
	268	newctl = pci_get_word(d->config + PCI_BRIDGE_CONTROL);
	269	if (~oldctl & newctl & PCI_BRIDGE_CTL_BUS_RESET) {
	270	/* Trigger hot reset on 0->1 transition. */
81e3e75b	271	qbus_reset_all(&s->sec_bus.qbus);
a5fce077	272	}
783753fd IY	273	}
783753fd IY	274
0208def1 IY	275	void pci_bridge_disable_base_limit(PCIDevice *dev)
	276	{
	277	uint8_t *conf = dev->config;
	278
	279	pci_byte_test_and_set_mask(conf + PCI_IO_BASE,
	280	PCI_IO_RANGE_MASK & 0xff);
	281	pci_byte_test_and_clear_mask(conf + PCI_IO_LIMIT,
	282	PCI_IO_RANGE_MASK & 0xff);
	283	pci_word_test_and_set_mask(conf + PCI_MEMORY_BASE,
	284	PCI_MEMORY_RANGE_MASK & 0xffff);
	285	pci_word_test_and_clear_mask(conf + PCI_MEMORY_LIMIT,
	286	PCI_MEMORY_RANGE_MASK & 0xffff);
	287	pci_word_test_and_set_mask(conf + PCI_PREF_MEMORY_BASE,
	288	PCI_PREF_RANGE_MASK & 0xffff);
	289	pci_word_test_and_clear_mask(conf + PCI_PREF_MEMORY_LIMIT,
	290	PCI_PREF_RANGE_MASK & 0xffff);
cd7898f7 MT	291	pci_set_long(conf + PCI_PREF_BASE_UPPER32, 0);
cd7898f7 MT	292	pci_set_long(conf + PCI_PREF_LIMIT_UPPER32, 0);
0208def1 IY	293	}
0208def1 IY	294
68f79994	295	/* reset bridge specific configuration registers */
cbd2d434	296	void pci_bridge_reset(DeviceState *qdev)
68f79994	297	{
cbd2d434	298	PCIDevice *dev = PCI_DEVICE(qdev);
68f79994 IY	299	uint8_t *conf = dev->config;
	300
	301	conf[PCI_PRIMARY_BUS] = 0;
	302	conf[PCI_SECONDARY_BUS] = 0;
	303	conf[PCI_SUBORDINATE_BUS] = 0;
	304	conf[PCI_SEC_LATENCY_TIMER] = 0;
	305
0208def1 IY	306	/*
	307	* the default values for base/limit registers aren't specified
	308	* in the PCI-to-PCI-bridge spec. So we don't thouch them here.
	309	* Each implementation can override it.
	310	* typical implementation does
	311	* zero base/limit registers or
	312	* disable forwarding: pci_bridge_disable_base_limit()
	313	* If disable forwarding is wanted, call pci_bridge_disable_base_limit()
	314	* after this function.
	315	*/
	316	pci_byte_test_and_clear_mask(conf + PCI_IO_BASE,
	317	PCI_IO_RANGE_MASK & 0xff);
	318	pci_byte_test_and_clear_mask(conf + PCI_IO_LIMIT,
	319	PCI_IO_RANGE_MASK & 0xff);
	320	pci_word_test_and_clear_mask(conf + PCI_MEMORY_BASE,
	321	PCI_MEMORY_RANGE_MASK & 0xffff);
	322	pci_word_test_and_clear_mask(conf + PCI_MEMORY_LIMIT,
	323	PCI_MEMORY_RANGE_MASK & 0xffff);
	324	pci_word_test_and_clear_mask(conf + PCI_PREF_MEMORY_BASE,
	325	PCI_PREF_RANGE_MASK & 0xffff);
	326	pci_word_test_and_clear_mask(conf + PCI_PREF_MEMORY_LIMIT,
	327	PCI_PREF_RANGE_MASK & 0xffff);
cd7898f7 MT	328	pci_set_long(conf + PCI_PREF_BASE_UPPER32, 0);
cd7898f7 MT	329	pci_set_long(conf + PCI_PREF_LIMIT_UPPER32, 0);
68f79994 IY	330
	331	pci_set_word(conf + PCI_BRIDGE_CONTROL, 0);
	332	}
	333
68f79994	334	/* default qdev initialization function for PCI-to-PCI bridge */
60a0e443	335	int pci_bridge_initfn(PCIDevice dev, const char typename)
68f79994 IY	336	{
68f79994 IY	337	PCIBus *parent = dev->bus;
f055e96b	338	PCIBridge *br = PCI_BRIDGE(dev);
68f79994	339	PCIBus *sec_bus = &br->sec_bus;
783753fd	340
95be1196 MT	341	pci_word_test_and_set_mask(dev->config + PCI_STATUS,
95be1196 MT	342	PCI_STATUS_66MHZ \| PCI_STATUS_FAST_BACK);
ba7d8515 AW	343
	344	/*
	345	* TODO: We implement VGA Enable in the Bridge Control Register
	346	* therefore per the PCI to PCI bridge spec we must also implement
	347	* VGA Palette Snooping. When done, set this bit writable:
	348	*
	349	* pci_word_test_and_set_mask(dev->wmask + PCI_COMMAND,
	350	* PCI_COMMAND_VGA_PALETTE);
	351	*/
	352
783753fd IY	353	pci_config_set_class(dev->config, PCI_CLASS_BRIDGE_PCI);
	354	dev->config[PCI_HEADER_TYPE] =
	355	(dev->config[PCI_HEADER_TYPE] & PCI_HEADER_TYPE_MULTI_FUNCTION) \|
	356	PCI_HEADER_TYPE_BRIDGE;
	357	pci_set_word(dev->config + PCI_SEC_STATUS,
	358	PCI_STATUS_66MHZ \| PCI_STATUS_FAST_BACK);
68f79994	359
8a3d80fa MT	360	/*
	361	* If we don't specify the name, the bus will be addressed as <id>.0, where
	362	* id is the device id.
	363	* Since PCI Bridge devices have a single bus each, we don't need the index:
	364	* let users address the bus using the device name.
	365	*/
	366	if (!br->bus_name && dev->qdev.id && *dev->qdev.id) {
	367	br->bus_name = dev->qdev.id;
	368	}
	369
fb17dfe0 AF	370	qbus_create_inplace(sec_bus, sizeof(br->sec_bus), typename, DEVICE(dev),
fb17dfe0 AF	371	br->bus_name);
68f79994	372	sec_bus->parent_dev = dev;
659fefee	373	sec_bus->map_irq = br->map_irq ? br->map_irq : pci_swizzle_map_irq_fn;
336411ca	374	sec_bus->address_space_mem = &br->address_space_mem;
cf252e51	375	memory_region_init(&br->address_space_mem, OBJECT(br), "pci_bridge_pci", UINT64_MAX);
336411ca	376	sec_bus->address_space_io = &br->address_space_io;
40c5dce9	377	memory_region_init(&br->address_space_io, OBJECT(br), "pci_bridge_io", 65536);
b308c82c	378	br->windows = pci_bridge_region_init(br);
68f79994 IY	379	QLIST_INIT(&sec_bus->child);
68f79994 IY	380	QLIST_INSERT_HEAD(&parent->child, sec_bus, sibling);
783753fd IY	381	return 0;
	382	}
	383
68f79994	384	/* default qdev clean up function for PCI-to-PCI bridge */
f90c2bcd	385	void pci_bridge_exitfn(PCIDevice *pci_dev)
783753fd	386	{
f055e96b	387	PCIBridge *s = PCI_BRIDGE(pci_dev);
51a92333 IY	388	assert(QLIST_EMPTY(&s->sec_bus.child));
51a92333 IY	389	QLIST_REMOVE(&s->sec_bus, sibling);
b308c82c AK	390	pci_bridge_region_del(s, s->windows);
b308c82c AK	391	pci_bridge_region_cleanup(s, s->windows);
336411ca MT	392	memory_region_destroy(&s->address_space_mem);
336411ca MT	393	memory_region_destroy(&s->address_space_io);
6780a22c	394	/* object_unparent() is called automatically during device deletion */
783753fd IY	395	}
783753fd IY	396
68f79994 IY	397	/*
	398	* before qdev initialization(qdev_init()), this function sets bus_name and
	399	* map_irq callback which are necessry for pci_bridge_initfn() to
	400	* initialize bus.
	401	*/
	402	void pci_bridge_map_irq(PCIBridge br, const char bus_name,
	403	pci_map_irq_fn map_irq)
783753fd	404	{
68f79994 IY	405	br->map_irq = map_irq;
68f79994 IY	406	br->bus_name = bus_name;
783753fd	407	}
f055e96b AF	408
	409	static const TypeInfo pci_bridge_type_info = {
	410	.name = TYPE_PCI_BRIDGE,
	411	.parent = TYPE_PCI_DEVICE,
	412	.instance_size = sizeof(PCIBridge),
	413	.abstract = true,
	414	};
	415
	416	static void pci_bridge_register_types(void)
	417	{
	418	type_register_static(&pci_bridge_type_info);
	419	}
	420
	421	type_init(pci_bridge_register_types)