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qemu/hw/piix_pci.c
Avi Kivity 72124c01c6 piix_pci: wrap memory update in a transaction 
The code will remap all PAMs, even if just one is updated, resulting
in reduced performance.  Wrap in a transaction to detect that those
other PAMs have not changed.

Reviewed-by: Richard Henderson  <rth@twiddle.net>
Signed-off-by: Avi Kivity <avi@redhat.com>
2011-09-04 17:46:51 +03:00

569 lines
18 KiB
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/*
* QEMU i440FX/PIIX3 PCI Bridge Emulation
*
* Copyright (c) 2006 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 deal
* 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.
*/
#include "hw.h"
#include "pc.h"
#include "pci.h"
#include "pci_host.h"
#include "isa.h"
#include "sysbus.h"
#include "range.h"
#include "xen.h"
/*
* I440FX chipset data sheet.
* http://download.intel.com/design/chipsets/datashts/29054901.pdf
*/
typedef PCIHostState I440FXState;
#define PIIX_NUM_PIC_IRQS 16 /* i8259 * 2 */
#define PIIX_NUM_PIRQS 4ULL /* PIRQ[A-D] */
#define XEN_PIIX_NUM_PIRQS 128ULL
#define PIIX_PIRQC 0x60
typedef struct PIIX3State {
PCIDevice dev;
/*
* bitmap to track pic levels.
* The pic level is the logical OR of all the PCI irqs mapped to it
* So one PIC level is tracked by PIIX_NUM_PIRQS bits.
*
* PIRQ is mapped to PIC pins, we track it by
* PIIX_NUM_PIRQS * PIIX_NUM_PIC_IRQS = 64 bits with
* pic_irq * PIIX_NUM_PIRQS + pirq
*/
#if PIIX_NUM_PIC_IRQS * PIIX_NUM_PIRQS > 64
#error "unable to encode pic state in 64bit in pic_levels."
#endif
uint64_t pic_levels;
qemu_irq *pic;
/* This member isn't used. Just for save/load compatibility */
int32_t pci_irq_levels_vmstate[PIIX_NUM_PIRQS];
} PIIX3State;
typedef struct PAMMemoryRegion {
MemoryRegion mem;
bool initialized;
} PAMMemoryRegion;
struct PCII440FXState {
PCIDevice dev;
MemoryRegion *system_memory;
MemoryRegion *pci_address_space;
MemoryRegion *ram_memory;
MemoryRegion pci_hole;
MemoryRegion pci_hole_64bit;
PAMMemoryRegion pam_regions[13];
MemoryRegion smram_region;
uint8_t smm_enabled;
bool smram_enabled;
PIIX3State *piix3;
};
#define I440FX_PAM 0x59
#define I440FX_PAM_SIZE 7
#define I440FX_SMRAM 0x72
static void piix3_set_irq(void *opaque, int pirq, int level);
static void piix3_write_config_xen(PCIDevice *dev,
uint32_t address, uint32_t val, int len);
/* return the global irq number corresponding to a given device irq
pin. We could also use the bus number to have a more precise
mapping. */
static int pci_slot_get_pirq(PCIDevice *pci_dev, int pci_intx)
{
int slot_addend;
slot_addend = (pci_dev->devfn >> 3) - 1;
return (pci_intx + slot_addend) & 3;
}
static void update_pam(PCII440FXState *d, uint32_t start, uint32_t end, int r,
PAMMemoryRegion *mem)
{
if (mem->initialized) {
memory_region_del_subregion(d->system_memory, &mem->mem);
memory_region_destroy(&mem->mem);
}
// printf("ISA mapping %08x-0x%08x: %d\n", start, end, r);
switch(r) {
case 3:
/* RAM */
memory_region_init_alias(&mem->mem, "pam-ram", d->ram_memory,
start, end - start);
break;
case 1:
/* ROM (XXX: not quite correct) */
memory_region_init_alias(&mem->mem, "pam-rom", d->ram_memory,
start, end - start);
memory_region_set_readonly(&mem->mem, true);
break;
case 2:
case 0:
/* XXX: should distinguish read/write cases */
memory_region_init_alias(&mem->mem, "pam-pci", d->pci_address_space,
start, end - start);
break;
}
memory_region_add_subregion_overlap(d->system_memory,
start, &mem->mem, 1);
mem->initialized = true;
}
static void i440fx_update_memory_mappings(PCII440FXState *d)
{
int i, r;
uint32_t smram;
memory_region_transaction_begin();
update_pam(d, 0xf0000, 0x100000, (d->dev.config[I440FX_PAM] >> 4) & 3,
&d->pam_regions[0]);
for(i = 0; i < 12; i++) {
r = (d->dev.config[(i >> 1) + (I440FX_PAM + 1)] >> ((i & 1) * 4)) & 3;
update_pam(d, 0xc0000 + 0x4000 * i, 0xc0000 + 0x4000 * (i + 1), r,
&d->pam_regions[i+1]);
}
smram = d->dev.config[I440FX_SMRAM];
if ((d->smm_enabled && (smram & 0x08)) || (smram & 0x40)) {
if (!d->smram_enabled) {
memory_region_del_subregion(d->system_memory, &d->smram_region);
d->smram_enabled = true;
}
} else {
if (d->smram_enabled) {
memory_region_add_subregion_overlap(d->system_memory, 0xa0000,
&d->smram_region, 1);
d->smram_enabled = false;
}
}
memory_region_transaction_commit();
}
static void i440fx_set_smm(int val, void *arg)
{
PCII440FXState *d = arg;
val = (val != 0);
if (d->smm_enabled != val) {
d->smm_enabled = val;
i440fx_update_memory_mappings(d);
}
}
static void i440fx_write_config(PCIDevice *dev,
uint32_t address, uint32_t val, int len)
{
PCII440FXState *d = DO_UPCAST(PCII440FXState, dev, dev);
/* XXX: implement SMRAM.D_LOCK */
pci_default_write_config(dev, address, val, len);
if (ranges_overlap(address, len, I440FX_PAM, I440FX_PAM_SIZE) ||
range_covers_byte(address, len, I440FX_SMRAM)) {
i440fx_update_memory_mappings(d);
}
}
static int i440fx_load_old(QEMUFile* f, void *opaque, int version_id)
{
PCII440FXState *d = opaque;
int ret, i;
ret = pci_device_load(&d->dev, f);
if (ret < 0)
return ret;
i440fx_update_memory_mappings(d);
qemu_get_8s(f, &d->smm_enabled);
if (version_id == 2) {
for (i = 0; i < PIIX_NUM_PIRQS; i++) {
qemu_get_be32(f); /* dummy load for compatibility */
}
}
return 0;
}
static int i440fx_post_load(void *opaque, int version_id)
{
PCII440FXState *d = opaque;
i440fx_update_memory_mappings(d);
return 0;
}
static const VMStateDescription vmstate_i440fx = {
.name = "I440FX",
.version_id = 3,
.minimum_version_id = 3,
.minimum_version_id_old = 1,
.load_state_old = i440fx_load_old,
.post_load = i440fx_post_load,
.fields = (VMStateField []) {
VMSTATE_PCI_DEVICE(dev, PCII440FXState),
VMSTATE_UINT8(smm_enabled, PCII440FXState),
VMSTATE_END_OF_LIST()
}
};
static int i440fx_pcihost_initfn(SysBusDevice *dev)
{
I440FXState *s = FROM_SYSBUS(I440FXState, dev);
memory_region_init_io(&s->conf_mem, &pci_host_conf_le_ops, s,
"pci-conf-idx", 4);
sysbus_add_io(dev, 0xcf8, &s->conf_mem);
sysbus_init_ioports(&s->busdev, 0xcf8, 4);
memory_region_init_io(&s->data_mem, &pci_host_data_le_ops, s,
"pci-conf-data", 4);
sysbus_add_io(dev, 0xcfc, &s->data_mem);
sysbus_init_ioports(&s->busdev, 0xcfc, 4);
return 0;
}
static int i440fx_initfn(PCIDevice *dev)
{
PCII440FXState *d = DO_UPCAST(PCII440FXState, dev, dev);
d->dev.config[I440FX_SMRAM] = 0x02;
cpu_smm_register(&i440fx_set_smm, d);
return 0;
}
static PCIBus *i440fx_common_init(const char *device_name,
PCII440FXState **pi440fx_state,
int *piix3_devfn,
qemu_irq *pic,
MemoryRegion *address_space_mem,
MemoryRegion *address_space_io,
ram_addr_t ram_size,
target_phys_addr_t pci_hole_start,
target_phys_addr_t pci_hole_size,
target_phys_addr_t pci_hole64_start,
target_phys_addr_t pci_hole64_size,
MemoryRegion *pci_address_space,
MemoryRegion *ram_memory)
{
DeviceState *dev;
PCIBus *b;
PCIDevice *d;
I440FXState *s;
PIIX3State *piix3;
PCII440FXState *f;
dev = qdev_create(NULL, "i440FX-pcihost");
s = FROM_SYSBUS(I440FXState, sysbus_from_qdev(dev));
s->address_space = address_space_mem;
b = pci_bus_new(&s->busdev.qdev, NULL, pci_address_space,
address_space_io, 0);
s->bus = b;
qdev_init_nofail(dev);
d = pci_create_simple(b, 0, device_name);
*pi440fx_state = DO_UPCAST(PCII440FXState, dev, d);
f = *pi440fx_state;
f->system_memory = address_space_mem;
f->pci_address_space = pci_address_space;
f->ram_memory = ram_memory;
memory_region_init_alias(&f->pci_hole, "pci-hole", f->pci_address_space,
pci_hole_start, pci_hole_size);
memory_region_add_subregion(f->system_memory, pci_hole_start, &f->pci_hole);
memory_region_init_alias(&f->pci_hole_64bit, "pci-hole64",
f->pci_address_space,
pci_hole64_start, pci_hole64_size);
if (pci_hole64_size) {
memory_region_add_subregion(f->system_memory, pci_hole64_start,
&f->pci_hole_64bit);
}
memory_region_init_alias(&f->smram_region, "smram-region",
f->pci_address_space, 0xa0000, 0x20000);
f->smram_enabled = true;
/* Xen supports additional interrupt routes from the PCI devices to
* the IOAPIC: the four pins of each PCI device on the bus are also
* connected to the IOAPIC directly.
* These additional routes can be discovered through ACPI. */
if (xen_enabled()) {
piix3 = DO_UPCAST(PIIX3State, dev,
pci_create_simple_multifunction(b, -1, true, "PIIX3-xen"));
pci_bus_irqs(b, xen_piix3_set_irq, xen_pci_slot_get_pirq,
piix3, XEN_PIIX_NUM_PIRQS);
} else {
piix3 = DO_UPCAST(PIIX3State, dev,
pci_create_simple_multifunction(b, -1, true, "PIIX3"));
pci_bus_irqs(b, piix3_set_irq, pci_slot_get_pirq, piix3,
PIIX_NUM_PIRQS);
}
piix3->pic = pic;
(*pi440fx_state)->piix3 = piix3;
*piix3_devfn = piix3->dev.devfn;
ram_size = ram_size / 8 / 1024 / 1024;
if (ram_size > 255)
ram_size = 255;
(*pi440fx_state)->dev.config[0x57]=ram_size;
i440fx_update_memory_mappings(f);
return b;
}
PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix3_devfn,
qemu_irq *pic,
MemoryRegion *address_space_mem,
MemoryRegion *address_space_io,
ram_addr_t ram_size,
target_phys_addr_t pci_hole_start,
target_phys_addr_t pci_hole_size,
target_phys_addr_t pci_hole64_start,
target_phys_addr_t pci_hole64_size,
MemoryRegion *pci_memory, MemoryRegion *ram_memory)
{
PCIBus *b;
b = i440fx_common_init("i440FX", pi440fx_state, piix3_devfn, pic,
address_space_mem, address_space_io, ram_size,
pci_hole_start, pci_hole_size,
pci_hole64_size, pci_hole64_size,
pci_memory, ram_memory);
return b;
}
/* PIIX3 PCI to ISA bridge */
static void piix3_set_irq_pic(PIIX3State *piix3, int pic_irq)
{
qemu_set_irq(piix3->pic[pic_irq],
!!(piix3->pic_levels &
(((1ULL << PIIX_NUM_PIRQS) - 1) <<
(pic_irq * PIIX_NUM_PIRQS))));
}
static void piix3_set_irq_level(PIIX3State *piix3, int pirq, int level)
{
int pic_irq;
uint64_t mask;
pic_irq = piix3->dev.config[PIIX_PIRQC + pirq];
if (pic_irq >= PIIX_NUM_PIC_IRQS) {
return;
}
mask = 1ULL << ((pic_irq * PIIX_NUM_PIRQS) + pirq);
piix3->pic_levels &= ~mask;
piix3->pic_levels |= mask * !!level;
piix3_set_irq_pic(piix3, pic_irq);
}
static void piix3_set_irq(void *opaque, int pirq, int level)
{
PIIX3State *piix3 = opaque;
piix3_set_irq_level(piix3, pirq, level);
}
/* irq routing is changed. so rebuild bitmap */
static void piix3_update_irq_levels(PIIX3State *piix3)
{
int pirq;
piix3->pic_levels = 0;
for (pirq = 0; pirq < PIIX_NUM_PIRQS; pirq++) {
piix3_set_irq_level(piix3, pirq,
pci_bus_get_irq_level(piix3->dev.bus, pirq));
}
}
static void piix3_write_config(PCIDevice *dev,
uint32_t address, uint32_t val, int len)
{
pci_default_write_config(dev, address, val, len);
if (ranges_overlap(address, len, PIIX_PIRQC, 4)) {
PIIX3State *piix3 = DO_UPCAST(PIIX3State, dev, dev);
int pic_irq;
piix3_update_irq_levels(piix3);
for (pic_irq = 0; pic_irq < PIIX_NUM_PIC_IRQS; pic_irq++) {
piix3_set_irq_pic(piix3, pic_irq);
}
}
}
static void piix3_write_config_xen(PCIDevice *dev,
uint32_t address, uint32_t val, int len)
{
xen_piix_pci_write_config_client(address, val, len);
piix3_write_config(dev, address, val, len);
}
static void piix3_reset(void *opaque)
{
PIIX3State *d = opaque;
uint8_t *pci_conf = d->dev.config;
pci_conf[0x04] = 0x07; // master, memory and I/O
pci_conf[0x05] = 0x00;
pci_conf[0x06] = 0x00;
pci_conf[0x07] = 0x02; // PCI_status_devsel_medium
pci_conf[0x4c] = 0x4d;
pci_conf[0x4e] = 0x03;
pci_conf[0x4f] = 0x00;
pci_conf[0x60] = 0x80;
pci_conf[0x61] = 0x80;
pci_conf[0x62] = 0x80;
pci_conf[0x63] = 0x80;
pci_conf[0x69] = 0x02;
pci_conf[0x70] = 0x80;
pci_conf[0x76] = 0x0c;
pci_conf[0x77] = 0x0c;
pci_conf[0x78] = 0x02;
pci_conf[0x79] = 0x00;
pci_conf[0x80] = 0x00;
pci_conf[0x82] = 0x00;
pci_conf[0xa0] = 0x08;
pci_conf[0xa2] = 0x00;
pci_conf[0xa3] = 0x00;
pci_conf[0xa4] = 0x00;
pci_conf[0xa5] = 0x00;
pci_conf[0xa6] = 0x00;
pci_conf[0xa7] = 0x00;
pci_conf[0xa8] = 0x0f;
pci_conf[0xaa] = 0x00;
pci_conf[0xab] = 0x00;
pci_conf[0xac] = 0x00;
pci_conf[0xae] = 0x00;
d->pic_levels = 0;
}
static int piix3_post_load(void *opaque, int version_id)
{
PIIX3State *piix3 = opaque;
piix3_update_irq_levels(piix3);
return 0;
}
static void piix3_pre_save(void *opaque)
{
int i;
PIIX3State *piix3 = opaque;
for (i = 0; i < ARRAY_SIZE(piix3->pci_irq_levels_vmstate); i++) {
piix3->pci_irq_levels_vmstate[i] =
pci_bus_get_irq_level(piix3->dev.bus, i);
}
}
static const VMStateDescription vmstate_piix3 = {
.name = "PIIX3",
.version_id = 3,
.minimum_version_id = 2,
.minimum_version_id_old = 2,
.post_load = piix3_post_load,
.pre_save = piix3_pre_save,
.fields = (VMStateField []) {
VMSTATE_PCI_DEVICE(dev, PIIX3State),
VMSTATE_INT32_ARRAY_V(pci_irq_levels_vmstate, PIIX3State,
PIIX_NUM_PIRQS, 3),
VMSTATE_END_OF_LIST()
}
};
static int piix3_initfn(PCIDevice *dev)
{
PIIX3State *d = DO_UPCAST(PIIX3State, dev, dev);
isa_bus_new(&d->dev.qdev);
qemu_register_reset(piix3_reset, d);
return 0;
}
static PCIDeviceInfo i440fx_info[] = {
{
.qdev.name = "i440FX",
.qdev.desc = "Host bridge",
.qdev.size = sizeof(PCII440FXState),
.qdev.vmsd = &vmstate_i440fx,
.qdev.no_user = 1,
.no_hotplug = 1,
.init = i440fx_initfn,
.config_write = i440fx_write_config,
.vendor_id = PCI_VENDOR_ID_INTEL,
.device_id = PCI_DEVICE_ID_INTEL_82441,
.revision = 0x02,
.class_id = PCI_CLASS_BRIDGE_HOST,
},{
.qdev.name = "PIIX3",
.qdev.desc = "ISA bridge",
.qdev.size = sizeof(PIIX3State),
.qdev.vmsd = &vmstate_piix3,
.qdev.no_user = 1,
.no_hotplug = 1,
.init = piix3_initfn,
.config_write = piix3_write_config,
.vendor_id = PCI_VENDOR_ID_INTEL,
.device_id = PCI_DEVICE_ID_INTEL_82371SB_0, // 82371SB PIIX3 PCI-to-ISA bridge (Step A1)
.class_id = PCI_CLASS_BRIDGE_ISA,
},{
.qdev.name = "PIIX3-xen",
.qdev.desc = "ISA bridge",
.qdev.size = sizeof(PIIX3State),
.qdev.vmsd = &vmstate_piix3,
.qdev.no_user = 1,
.no_hotplug = 1,
.init = piix3_initfn,
.config_write = piix3_write_config_xen,
.vendor_id = PCI_VENDOR_ID_INTEL,
.device_id = PCI_DEVICE_ID_INTEL_82371SB_0, // 82371SB PIIX3 PCI-to-ISA bridge (Step A1)
.class_id = PCI_CLASS_BRIDGE_ISA,
},{
/* end of list */
}
};
static SysBusDeviceInfo i440fx_pcihost_info = {
.init = i440fx_pcihost_initfn,
.qdev.name = "i440FX-pcihost",
.qdev.fw_name = "pci",
.qdev.size = sizeof(I440FXState),
.qdev.no_user = 1,
};
static void i440fx_register(void)
{
sysbus_register_withprop(&i440fx_pcihost_info);
pci_qdev_register_many(i440fx_info);
}
device_init(i440fx_register);
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