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qemu / seabios / 7e9db04923854b7f4edca33948f55abee22907b9 / . / src / fw / pciinit.c
blob: d25931bb0573c0c59e6d4328d21d1b81bdb94f22 [file] [log] [blame]
// Initialize PCI devices (on emulators)
//
// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2006 Fabrice Bellard
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "byteorder.h" // le64_to_cpu
#include "config.h" // CONFIG_*
#include "dev-q35.h" // Q35_HOST_BRIDGE_PCIEXBAR_ADDR
#include "dev-piix.h" // PIIX_*
#include "e820map.h" // e820_add
#include "hw/ata.h" // PORT_ATA1_CMD_BASE
#include "hw/pci.h" // pci_config_readl
#include "hw/pcidevice.h" // pci_probe_devices
#include "hw/pci_ids.h" // PCI_VENDOR_ID_INTEL
#include "hw/pci_regs.h" // PCI_COMMAND
#include "fw/dev-pci.h" // REDHAT_CAP_RESOURCE_RESERVE
#include "list.h" // struct hlist_node
#include "malloc.h" // free
#include "output.h" // dprintf
#include "paravirt.h" // RamSize
#include "romfile.h" // romfile_loadint
#include "string.h" // memset
#include "util.h" // pci_setup
#include "x86.h" // outb
#define PCI_DEVICE_MEM_MIN (1<<12) // 4k == page size
#define PCI_BRIDGE_MEM_MIN (1<<21) // 2M == hugepage size
#define PCI_BRIDGE_IO_MIN 0x1000 // mandated by pci bridge spec
#define PCI_ROM_SLOT 6
#define PCI_NUM_REGIONS 7
#define PCI_BRIDGE_NUM_REGIONS 2
enum pci_region_type {
PCI_REGION_TYPE_IO,
PCI_REGION_TYPE_MEM,
PCI_REGION_TYPE_PREFMEM,
PCI_REGION_TYPE_COUNT,
};
static const char *region_type_name[] = {
[ PCI_REGION_TYPE_IO ] = "io",
[ PCI_REGION_TYPE_MEM ] = "mem",
[ PCI_REGION_TYPE_PREFMEM ] = "prefmem",
};
u64 pcimem_start = BUILD_PCIMEM_START;
u64 pcimem_end = BUILD_PCIMEM_END;
u64 pcimem64_start = BUILD_PCIMEM64_START;
u64 pcimem64_end = BUILD_PCIMEM64_END;
u64 pci_io_low_end = 0xa000;
struct pci_region_entry {
struct pci_device *dev;
int bar;
u64 size;
u64 align;
int is64;
enum pci_region_type type;
struct hlist_node node;
};
struct pci_region {
/* pci region assignments */
u64 base;
struct hlist_head list;
};
struct pci_bus {
struct pci_region r[PCI_REGION_TYPE_COUNT];
struct pci_device *bus_dev;
};
static u32 pci_bar(struct pci_device *pci, int region_num)
{
if (region_num != PCI_ROM_SLOT) {
return PCI_BASE_ADDRESS_0 + region_num * 4;
}
#define PCI_HEADER_TYPE_MULTI_FUNCTION 0x80
u8 type = pci->header_type & ~PCI_HEADER_TYPE_MULTI_FUNCTION;
return type == PCI_HEADER_TYPE_BRIDGE ? PCI_ROM_ADDRESS1 : PCI_ROM_ADDRESS;
}
static void
pci_set_io_region_addr(struct pci_device *pci, int bar, u64 addr, int is64)
{
u32 ofs = pci_bar(pci, bar);
pci_config_writel(pci->bdf, ofs, addr);
if (is64)
pci_config_writel(pci->bdf, ofs + 4, addr >> 32);
}
/****************************************************************
* Misc. device init
****************************************************************/
/* host irqs corresponding to PCI irqs A-D */
const u8 pci_irqs[4] = {
10, 10, 11, 11
};
static int dummy_pci_slot_get_irq(struct pci_device *pci, int pin)
{
dprintf(1, "pci_slot_get_irq called with unknown routing\n");
return 0xff; /* PCI defined "unknown" or "no connection" for x86 */
}
static int (*pci_slot_get_irq)(struct pci_device *pci, int pin) =
dummy_pci_slot_get_irq;
// Return the global irq number corresponding to a host bus device irq pin.
static int piix_pci_slot_get_irq(struct pci_device *pci, int pin)
{
int slot_addend = 0;
while (pci->parent != NULL) {
slot_addend += pci_bdf_to_dev(pci->bdf);
pci = pci->parent;
}
slot_addend += pci_bdf_to_dev(pci->bdf) - 1;
return pci_irqs[(pin - 1 + slot_addend) & 3];
}
static int mch_pci_slot_get_irq(struct pci_device *pci, int pin)
{
int pin_addend = 0;
while (pci->parent != NULL) {
pin_addend += pci_bdf_to_dev(pci->bdf);
pci = pci->parent;
}
u8 slot = pci_bdf_to_dev(pci->bdf);
if (slot <= 24)
/* Slots 0-24 rotate slot:pin mapping similar to piix above, but
with a different starting index - see q35-acpi-dsdt.dsl */
return pci_irqs[(pin - 1 + pin_addend + slot) & 3];
/* Slots 25-31 all use LNKA mapping (or LNKE, but A:D = E:H) */
return pci_irqs[(pin - 1 + pin_addend) & 3];
}
/* PIIX3/PIIX4 PCI to ISA bridge */
static void piix_isa_bridge_setup(struct pci_device *pci, void *arg)
{
int i, irq;
u8 elcr[2];
elcr[0] = 0x00;
elcr[1] = 0x00;
for (i = 0; i < 4; i++) {
irq = pci_irqs[i];
/* set to trigger level */
elcr[irq >> 3] |= (1 << (irq & 7));
/* activate irq remapping in PIIX */
pci_config_writeb(pci->bdf, 0x60 + i, irq);
}
outb(elcr[0], PIIX_PORT_ELCR1);
outb(elcr[1], PIIX_PORT_ELCR2);
dprintf(1, "PIIX3/PIIX4 init: elcr=%02x %02x\n", elcr[0], elcr[1]);
}
static void mch_isa_lpc_setup(u16 bdf)
{
/* pm io base */
pci_config_writel(bdf, ICH9_LPC_PMBASE,
acpi_pm_base | ICH9_LPC_PMBASE_RTE);
/* acpi enable, SCI: IRQ9 000b = irq9*/
pci_config_writeb(bdf, ICH9_LPC_ACPI_CTRL, ICH9_LPC_ACPI_CTRL_ACPI_EN);
/* set root complex register block BAR */
pci_config_writel(bdf, ICH9_LPC_RCBA,
ICH9_LPC_RCBA_ADDR | ICH9_LPC_RCBA_EN);
}
static int ICH9LpcBDF = -1;
/* ICH9 LPC PCI to ISA bridge */
/* PCI_VENDOR_ID_INTEL && PCI_DEVICE_ID_INTEL_ICH9_LPC */
static void mch_isa_bridge_setup(struct pci_device *dev, void *arg)
{
u16 bdf = dev->bdf;
int i, irq;
u8 elcr[2];
elcr[0] = 0x00;
elcr[1] = 0x00;
for (i = 0; i < 4; i++) {
irq = pci_irqs[i];
/* set to trigger level */
elcr[irq >> 3] |= (1 << (irq & 7));
/* activate irq remapping in LPC */
/* PIRQ[A-D] routing */
pci_config_writeb(bdf, ICH9_LPC_PIRQA_ROUT + i, irq);
/* PIRQ[E-H] routing */
pci_config_writeb(bdf, ICH9_LPC_PIRQE_ROUT + i, irq);
}
outb(elcr[0], ICH9_LPC_PORT_ELCR1);
outb(elcr[1], ICH9_LPC_PORT_ELCR2);
dprintf(1, "Q35 LPC init: elcr=%02x %02x\n", elcr[0], elcr[1]);
ICH9LpcBDF = bdf;
mch_isa_lpc_setup(bdf);
e820_add(ICH9_LPC_RCBA_ADDR, 16*1024, E820_RESERVED);
acpi_pm1a_cnt = acpi_pm_base + 0x04;
pmtimer_setup(acpi_pm_base + 0x08);
}
static void storage_ide_setup(struct pci_device *pci, void *arg)
{
/* IDE: we map it as in ISA mode */
pci_set_io_region_addr(pci, 0, PORT_ATA1_CMD_BASE, 0);
pci_set_io_region_addr(pci, 1, PORT_ATA1_CTRL_BASE, 0);
pci_set_io_region_addr(pci, 2, PORT_ATA2_CMD_BASE, 0);
pci_set_io_region_addr(pci, 3, PORT_ATA2_CTRL_BASE, 0);
}
/* PIIX3/PIIX4 IDE */
static void piix_ide_setup(struct pci_device *pci, void *arg)
{
u16 bdf = pci->bdf;
pci_config_writew(bdf, 0x40, 0x8000); // enable IDE0
pci_config_writew(bdf, 0x42, 0x8000); // enable IDE1
}
static void pic_ibm_setup(struct pci_device *pci, void *arg)
{
/* PIC, IBM, MPIC & MPIC2 */
pci_set_io_region_addr(pci, 0, 0x80800000 + 0x00040000, 0);
}
static void apple_macio_setup(struct pci_device *pci, void *arg)
{
/* macio bridge */
pci_set_io_region_addr(pci, 0, 0x80800000, 0);
}
static void piix4_pm_config_setup(u16 bdf)
{
// acpi sci is hardwired to 9
pci_config_writeb(bdf, PCI_INTERRUPT_LINE, 9);
pci_config_writel(bdf, PIIX_PMBASE, acpi_pm_base | 1);
pci_config_writeb(bdf, PIIX_PMREGMISC, 0x01); /* enable PM io space */
pci_config_writel(bdf, PIIX_SMBHSTBASE, (acpi_pm_base + 0x100) | 1);
pci_config_writeb(bdf, PIIX_SMBHSTCFG, 0x09); /* enable SMBus io space */
}
static int PiixPmBDF = -1;
/* PIIX4 Power Management device (for ACPI) */
static void piix4_pm_setup(struct pci_device *pci, void *arg)
{
PiixPmBDF = pci->bdf;
piix4_pm_config_setup(pci->bdf);
acpi_pm1a_cnt = acpi_pm_base + 0x04;
pmtimer_setup(acpi_pm_base + 0x08);
}
static void ich9_smbus_enable(u16 bdf)
{
/* map smbus into io space */
pci_config_writel(bdf, ICH9_SMB_SMB_BASE,
(acpi_pm_base + 0x100) | PCI_BASE_ADDRESS_SPACE_IO);
/* enable SMBus */
pci_config_writeb(bdf, ICH9_SMB_HOSTC, ICH9_SMB_HOSTC_HST_EN);
}
static int ICH9SmbusBDF = -1;
/* ICH9 SMBUS */
/* PCI_VENDOR_ID_INTEL && PCI_DEVICE_ID_INTEL_ICH9_SMBUS */
static void ich9_smbus_setup(struct pci_device *dev, void *arg)
{
ICH9SmbusBDF = dev->bdf;
ich9_smbus_enable(dev->bdf);
}
static void intel_igd_setup(struct pci_device *dev, void *arg)
{
struct romfile_s *opregion = romfile_find("etc/igd-opregion");
u64 bdsm_size = le64_to_cpu(romfile_loadint("etc/igd-bdsm-size", 0));
/* Apply OpRegion to any Intel VGA device, more than one is undefined */
if (opregion && opregion->size) {
void *addr = memalign_high(PAGE_SIZE, opregion->size);
if (!addr) {
warn_noalloc();
return;
}
if (opregion->copy(opregion, addr, opregion->size) < 0) {
free(addr);
return;
}
pci_config_writel(dev->bdf, 0xFC, cpu_to_le32((u32)addr));
dprintf(1, "Intel IGD OpRegion enabled at 0x%08x, size %dKB, dev %pP\n"
, (u32)addr, opregion->size >> 10, dev);
}
/* Apply BDSM only to Intel VGA at 00:02.0 */
if (bdsm_size && (dev->bdf == pci_to_bdf(0, 2, 0))) {
void *addr = memalign_tmphigh(1024 * 1024, bdsm_size);
if (!addr) {
warn_noalloc();
return;
}
e820_add((u32)addr, bdsm_size, E820_RESERVED);
pci_config_writel(dev->bdf, 0x5C, cpu_to_le32((u32)addr));
dprintf(1, "Intel IGD BDSM enabled at 0x%08x, size %lldMB, dev %pP\n"
, (u32)addr, bdsm_size >> 20, dev);
}
}
static const struct pci_device_id pci_device_tbl[] = {
/* PIIX3/PIIX4 PCI to ISA bridge */
PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371SB_0,
piix_isa_bridge_setup),
PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_0,
piix_isa_bridge_setup),
PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH9_LPC,
mch_isa_bridge_setup),
/* STORAGE IDE */
PCI_DEVICE_CLASS(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371SB_1,
PCI_CLASS_STORAGE_IDE, piix_ide_setup),
PCI_DEVICE_CLASS(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB,
PCI_CLASS_STORAGE_IDE, piix_ide_setup),
PCI_DEVICE_CLASS(PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE,
storage_ide_setup),
/* PIC, IBM, MPIC & MPIC2 */
PCI_DEVICE_CLASS(PCI_VENDOR_ID_IBM, 0x0046, PCI_CLASS_SYSTEM_PIC,
pic_ibm_setup),
PCI_DEVICE_CLASS(PCI_VENDOR_ID_IBM, 0xFFFF, PCI_CLASS_SYSTEM_PIC,
pic_ibm_setup),
/* PIIX4 Power Management device (for ACPI) */
PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3,
piix4_pm_setup),
PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH9_SMBUS,
ich9_smbus_setup),
/* 0xff00 */
PCI_DEVICE_CLASS(PCI_VENDOR_ID_APPLE, 0x0017, 0xff00, apple_macio_setup),
PCI_DEVICE_CLASS(PCI_VENDOR_ID_APPLE, 0x0022, 0xff00, apple_macio_setup),
/* Intel IGD OpRegion setup */
PCI_DEVICE_CLASS(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA,
intel_igd_setup),
PCI_DEVICE_END,
};
static int MCHMmcfgBDF = -1;
static void mch_mmconfig_setup(u16 bdf);
void pci_resume(void)
{
if (!CONFIG_QEMU) {
return;
}
if (PiixPmBDF >= 0) {
piix4_pm_config_setup(PiixPmBDF);
}
if (ICH9LpcBDF >= 0) {
mch_isa_lpc_setup(ICH9LpcBDF);
}
if (ICH9SmbusBDF >= 0) {
ich9_smbus_enable(ICH9SmbusBDF);
}
if(MCHMmcfgBDF >= 0) {
mch_mmconfig_setup(MCHMmcfgBDF);
}
}
static void pci_bios_init_device(struct pci_device *pci)
{
dprintf(1, "PCI: init bdf=%pP id=%04x:%04x\n"
, pci, pci->vendor, pci->device);
/* map the interrupt */
u16 bdf = pci->bdf;
int pin = pci_config_readb(bdf, PCI_INTERRUPT_PIN);
if (pin != 0)
pci_config_writeb(bdf, PCI_INTERRUPT_LINE, pci_slot_get_irq(pci, pin));
pci_init_device(pci_device_tbl, pci, NULL);
/* enable memory mappings */
pci_config_maskw(bdf, PCI_COMMAND, 0,
PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_SERR);
/* enable SERR# for forwarding */
if (pci->header_type & PCI_HEADER_TYPE_BRIDGE)
pci_config_maskw(bdf, PCI_BRIDGE_CONTROL, 0,
PCI_BRIDGE_CTL_SERR);
}
static void pci_bios_init_devices(void)
{
struct pci_device *pci;
foreachpci(pci) {
pci_bios_init_device(pci);
}
}
static void pci_enable_default_vga(void)
{
struct pci_device *pci;
foreachpci(pci) {
if (is_pci_vga(pci)) {
dprintf(1, "PCI: Using %pP for primary VGA\n", pci);
return;
}
}
pci = pci_find_class(PCI_CLASS_DISPLAY_VGA);
if (!pci) {
dprintf(1, "PCI: No VGA devices found\n");
return;
}
dprintf(1, "PCI: Enabling %pP for primary VGA\n", pci);
pci_config_maskw(pci->bdf, PCI_COMMAND, 0,
PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
while (pci->parent) {
pci = pci->parent;
dprintf(1, "PCI: Setting VGA enable on bridge %pP\n", pci);
pci_config_maskw(pci->bdf, PCI_BRIDGE_CONTROL, 0, PCI_BRIDGE_CTL_VGA);
pci_config_maskw(pci->bdf, PCI_COMMAND, 0,
PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
}
}
/****************************************************************
* Platform device initialization
****************************************************************/
static void i440fx_mem_addr_setup(struct pci_device *dev, void *arg)
{
if (RamSize <= 0x80000000)
pcimem_start = 0x80000000;
else if (RamSize <= 0xc0000000)
pcimem_start = 0xc0000000;
pci_slot_get_irq = piix_pci_slot_get_irq;
}
static void mch_mmconfig_setup(u16 bdf)
{
u64 addr = Q35_HOST_BRIDGE_PCIEXBAR_ADDR;
u32 upper = addr >> 32;
u32 lower = (addr & 0xffffffff) | Q35_HOST_BRIDGE_PCIEXBAREN;
pci_config_writel(bdf, Q35_HOST_BRIDGE_PCIEXBAR, 0);
pci_config_writel(bdf, Q35_HOST_BRIDGE_PCIEXBAR + 4, upper);
pci_config_writel(bdf, Q35_HOST_BRIDGE_PCIEXBAR, lower);
pci_enable_mmconfig(Q35_HOST_BRIDGE_PCIEXBAR_ADDR, "q35");
}
static void mch_mem_addr_setup(struct pci_device *dev, void *arg)
{
u64 addr = Q35_HOST_BRIDGE_PCIEXBAR_ADDR;
u32 size = Q35_HOST_BRIDGE_PCIEXBAR_SIZE;
/* setup mmconfig */
MCHMmcfgBDF = dev->bdf;
mch_mmconfig_setup(dev->bdf);
e820_add(addr, size, E820_RESERVED);
/* setup pci i/o window (above mmconfig) */
pcimem_start = addr + size;
pci_slot_get_irq = mch_pci_slot_get_irq;
/* setup io address space */
if (acpi_pm_base < 0x1000)
pci_io_low_end = 0x10000;
else
pci_io_low_end = acpi_pm_base;
}
static const struct pci_device_id pci_platform_tbl[] = {
PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82441,
i440fx_mem_addr_setup),
PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_Q35_MCH,
mch_mem_addr_setup),
PCI_DEVICE_END
};
static void pci_bios_init_platform(void)
{
struct pci_device *pci;
foreachpci(pci) {
pci_init_device(pci_platform_tbl, pci, NULL);
}
}
static u8 pci_find_resource_reserve_capability(u16 bdf)
{
u16 device_id;
if (pci_config_readw(bdf, PCI_VENDOR_ID) != PCI_VENDOR_ID_REDHAT) {
dprintf(3, "PCI: This is non-QEMU bridge.\n");
return 0;
}
device_id = pci_config_readw(bdf, PCI_DEVICE_ID);
if (device_id != PCI_DEVICE_ID_REDHAT_ROOT_PORT &&
device_id != PCI_DEVICE_ID_REDHAT_BRIDGE) {
dprintf(1, "PCI: QEMU resource reserve cap device ID doesn't match.\n");
return 0;
}
u8 cap = 0;
do {
cap = pci_find_capability(bdf, PCI_CAP_ID_VNDR, cap);
} while (cap &&
pci_config_readb(bdf, cap + PCI_CAP_REDHAT_TYPE_OFFSET) !=
REDHAT_CAP_RESOURCE_RESERVE);
if (cap) {
u8 cap_len = pci_config_readb(bdf, cap + PCI_CAP_FLAGS);
if (cap_len < RES_RESERVE_CAP_SIZE) {
dprintf(1, "PCI: QEMU resource reserve cap length %d is invalid\n",
cap_len);
return 0;
}
} else {
dprintf(1, "PCI: QEMU resource reserve cap not found\n");
}
return cap;
}
/****************************************************************
* Bus initialization
****************************************************************/
static void
pci_bios_init_bus_rec(int bus, u8 *pci_bus)
{
int bdf;
u16 class;
dprintf(1, "PCI: %s bus = 0x%x\n", __func__, bus);
/* prevent accidental access to unintended devices */
foreachbdf(bdf, bus) {
class = pci_config_readw(bdf, PCI_CLASS_DEVICE);
if (class == PCI_CLASS_BRIDGE_PCI) {
pci_config_writeb(bdf, PCI_SECONDARY_BUS, 255);
pci_config_writeb(bdf, PCI_SUBORDINATE_BUS, 0);
}
}
foreachbdf(bdf, bus) {
class = pci_config_readw(bdf, PCI_CLASS_DEVICE);
if (class != PCI_CLASS_BRIDGE_PCI) {
continue;
}
dprintf(1, "PCI: %s bdf = 0x%x\n", __func__, bdf);
u8 pribus = pci_config_readb(bdf, PCI_PRIMARY_BUS);
if (pribus != bus) {
dprintf(1, "PCI: primary bus = 0x%x -> 0x%x\n", pribus, bus);
pci_config_writeb(bdf, PCI_PRIMARY_BUS, bus);
} else {
dprintf(1, "PCI: primary bus = 0x%x\n", pribus);
}
u8 secbus = pci_config_readb(bdf, PCI_SECONDARY_BUS);
(*pci_bus)++;
if (*pci_bus != secbus) {
dprintf(1, "PCI: secondary bus = 0x%x -> 0x%x\n",
secbus, *pci_bus);
secbus = *pci_bus;
pci_config_writeb(bdf, PCI_SECONDARY_BUS, secbus);
} else {
dprintf(1, "PCI: secondary bus = 0x%x\n", secbus);
}
/* set to max for access to all subordinate buses.
later set it to accurate value */
u8 subbus = pci_config_readb(bdf, PCI_SUBORDINATE_BUS);
pci_config_writeb(bdf, PCI_SUBORDINATE_BUS, 255);
pci_bios_init_bus_rec(secbus, pci_bus);
if (subbus != *pci_bus) {
u8 res_bus = *pci_bus;
u8 cap = pci_find_resource_reserve_capability(bdf);
if (cap) {
u32 tmp_res_bus = pci_config_readl(bdf,
cap + RES_RESERVE_BUS_RES);
if (tmp_res_bus != (u32)-1) {
res_bus = tmp_res_bus & 0xFF;
if ((u8)(res_bus + secbus) < secbus ||
(u8)(res_bus + secbus) < res_bus) {
dprintf(1, "PCI: bus_reserve value %d is invalid\n",
res_bus);
res_bus = 0;
}
if (secbus + res_bus > *pci_bus) {
dprintf(1, "PCI: QEMU resource reserve cap: bus = %u\n",
res_bus);
res_bus = secbus + res_bus;
}
}
}
dprintf(1, "PCI: subordinate bus = 0x%x -> 0x%x\n",
subbus, res_bus);
subbus = res_bus;
*pci_bus = res_bus;
} else {
dprintf(1, "PCI: subordinate bus = 0x%x\n", subbus);
}
pci_config_writeb(bdf, PCI_SUBORDINATE_BUS, subbus);
}
}
static void
pci_bios_init_bus(void)
{
u8 extraroots = romfile_loadint("etc/extra-pci-roots", 0);
u8 pci_bus = 0;
pci_bios_init_bus_rec(0 /* host bus */, &pci_bus);
if (extraroots) {
while (pci_bus < 0xff) {
pci_bus++;
pci_bios_init_bus_rec(pci_bus, &pci_bus);
}
}
}
/****************************************************************
* Bus sizing
****************************************************************/
static void
pci_bios_get_bar(struct pci_device *pci, int bar,
int *ptype, u64 *psize, int *pis64)
{
u32 ofs = pci_bar(pci, bar);
u16 bdf = pci->bdf;
u32 old = pci_config_readl(bdf, ofs);
int is64 = 0, type = PCI_REGION_TYPE_MEM;
u64 mask;
if (bar == PCI_ROM_SLOT) {
mask = PCI_ROM_ADDRESS_MASK;
pci_config_writel(bdf, ofs, mask);
} else {
if (old & PCI_BASE_ADDRESS_SPACE_IO) {
mask = PCI_BASE_ADDRESS_IO_MASK;
type = PCI_REGION_TYPE_IO;
} else {
mask = PCI_BASE_ADDRESS_MEM_MASK;
if (old & PCI_BASE_ADDRESS_MEM_PREFETCH)
type = PCI_REGION_TYPE_PREFMEM;
is64 = ((old & PCI_BASE_ADDRESS_MEM_TYPE_MASK)
== PCI_BASE_ADDRESS_MEM_TYPE_64);
}
pci_config_writel(bdf, ofs, ~0);
}
u64 val = pci_config_readl(bdf, ofs);
pci_config_writel(bdf, ofs, old);
if (is64) {
u32 hold = pci_config_readl(bdf, ofs + 4);
pci_config_writel(bdf, ofs + 4, ~0);
u32 high = pci_config_readl(bdf, ofs + 4);
pci_config_writel(bdf, ofs + 4, hold);
val |= ((u64)high << 32);
mask |= ((u64)0xffffffff << 32);
*psize = (~(val & mask)) + 1;
} else {
*psize = ((~(val & mask)) + 1) & 0xffffffff;
}
*ptype = type;
*pis64 = is64;
}
static int pci_bios_bridge_region_is64(struct pci_region *r,
struct pci_device *pci, int type)
{
if (type != PCI_REGION_TYPE_PREFMEM)
return 0;
u32 pmem = pci_config_readl(pci->bdf, PCI_PREF_MEMORY_BASE);
if (!pmem) {
pci_config_writel(pci->bdf, PCI_PREF_MEMORY_BASE, 0xfff0fff0);
pmem = pci_config_readl(pci->bdf, PCI_PREF_MEMORY_BASE);
pci_config_writel(pci->bdf, PCI_PREF_MEMORY_BASE, 0x0);
}
if ((pmem & PCI_PREF_RANGE_TYPE_MASK) != PCI_PREF_RANGE_TYPE_64)
return 0;
struct pci_region_entry *entry;
hlist_for_each_entry(entry, &r->list, node) {
if (!entry->is64)
return 0;
}
return 1;
}
static u64 pci_region_align(struct pci_region *r)
{
struct pci_region_entry *entry;
hlist_for_each_entry(entry, &r->list, node) {
// The first entry in the sorted list has the largest alignment
return entry->align;
}
return 1;
}
static u64 pci_region_sum(struct pci_region *r)
{
u64 sum = 0;
struct pci_region_entry *entry;
hlist_for_each_entry(entry, &r->list, node) {
sum += entry->size;
}
return sum;
}
static void pci_region_migrate_64bit_entries(struct pci_region *from,
struct pci_region *to)
{
struct hlist_node *n, **last = &to->list.first;
struct pci_region_entry *entry;
hlist_for_each_entry_safe(entry, n, &from->list, node) {
if (!entry->is64)
continue;
if (entry->dev->class == PCI_CLASS_SERIAL_USB)
continue;
// Move from source list to destination list.
hlist_del(&entry->node);
hlist_add(&entry->node, last);
last = &entry->node.next;
}
}
static struct pci_region_entry *
pci_region_create_entry(struct pci_bus *bus, struct pci_device *dev,
int bar, u64 size, u64 align, int type, int is64)
{
struct pci_region_entry *entry = malloc_tmp(sizeof(*entry));
if (!entry) {
warn_noalloc();
return NULL;
}
memset(entry, 0, sizeof(*entry));
entry->dev = dev;
entry->bar = bar;
entry->size = size;
entry->align = align;
entry->is64 = is64;
entry->type = type;
// Insert into list in sorted order.
struct hlist_node **pprev;
struct pci_region_entry *pos;
hlist_for_each_entry_pprev(pos, pprev, &bus->r[type].list, node) {
if (pos->align < align || (pos->align == align && pos->size < size))
break;
}
hlist_add(&entry->node, pprev);
return entry;
}
static int pci_bus_hotplug_support(struct pci_bus *bus, u8 pcie_cap)
{
u8 shpc_cap;
if (pcie_cap) {
u16 pcie_flags = pci_config_readw(bus->bus_dev->bdf,
pcie_cap + PCI_EXP_FLAGS);
u8 port_type = ((pcie_flags & PCI_EXP_FLAGS_TYPE) >>
(__builtin_ffs(PCI_EXP_FLAGS_TYPE) - 1));
u8 downstream_port = (port_type == PCI_EXP_TYPE_DOWNSTREAM) ||
(port_type == PCI_EXP_TYPE_ROOT_PORT);
/*
* PCI Express SPEC, 7.8.2:
* Slot Implemented – When Set, this bit indicates that the Link
* HwInit associated with this Port is connected to a slot (as
* compared to being connected to a system-integrated device or
* being disabled).
* This bit is valid for Downstream Ports. This bit is undefined
* for Upstream Ports.
*/
u16 slot_implemented = pcie_flags & PCI_EXP_FLAGS_SLOT;
return downstream_port && slot_implemented;
}
shpc_cap = pci_find_capability(bus->bus_dev->bdf, PCI_CAP_ID_SHPC, 0);
return !!shpc_cap;
}
/* Test whether bridge support forwarding of transactions
* of a specific type.
* Note: disables bridge's window registers as a side effect.
*/
static int pci_bridge_has_region(struct pci_device *pci,
enum pci_region_type region_type)
{
u8 base;
switch (region_type) {
case PCI_REGION_TYPE_IO:
base = PCI_IO_BASE;
break;
case PCI_REGION_TYPE_PREFMEM:
base = PCI_PREF_MEMORY_BASE;
break;
default:
/* Regular memory support is mandatory */
return 1;
}
pci_config_writeb(pci->bdf, base, 0xFF);
return pci_config_readb(pci->bdf, base) != 0;
}
static int pci_bios_check_devices(struct pci_bus *busses)
{
dprintf(1, "PCI: check devices\n");
// Calculate resources needed for regular (non-bus) devices.
struct pci_device *pci;
foreachpci(pci) {
if (pci->class == PCI_CLASS_BRIDGE_PCI)
busses[pci->secondary_bus].bus_dev = pci;
struct pci_bus *bus = &busses[pci_bdf_to_bus(pci->bdf)];
if (!bus->bus_dev)
/*
* Resources for all root busses go in busses[0]
*/
bus = &busses[0];
int i;
for (i = 0; i < PCI_NUM_REGIONS; i++) {
if ((pci->class == PCI_CLASS_BRIDGE_PCI) &&
(i >= PCI_BRIDGE_NUM_REGIONS && i < PCI_ROM_SLOT))
continue;
int type, is64;
u64 size;
pci_bios_get_bar(pci, i, &type, &size, &is64);
if (size == 0)
continue;
if (type != PCI_REGION_TYPE_IO && size < PCI_DEVICE_MEM_MIN)
size = PCI_DEVICE_MEM_MIN;
struct pci_region_entry *entry = pci_region_create_entry(
bus, pci, i, size, size, type, is64);
if (!entry)
return -1;
if (is64)
i++;
}
}
// Propagate required bus resources to parent busses.
int secondary_bus;
for (secondary_bus=MaxPCIBus; secondary_bus>0; secondary_bus--) {
struct pci_bus *s = &busses[secondary_bus];
if (!s->bus_dev)
continue;
struct pci_bus *parent = &busses[pci_bdf_to_bus(s->bus_dev->bdf)];
if (!parent->bus_dev)
/*
* Resources for all root busses go in busses[0]
*/
parent = &busses[0];
int type;
u16 bdf = s->bus_dev->bdf;
u8 pcie_cap = pci_find_capability(bdf, PCI_CAP_ID_EXP, 0);
u8 qemu_cap = pci_find_resource_reserve_capability(bdf);
int hotplug_support = pci_bus_hotplug_support(s, pcie_cap);
for (type = 0; type < PCI_REGION_TYPE_COUNT; type++) {
u64 align = (type == PCI_REGION_TYPE_IO) ?
PCI_BRIDGE_IO_MIN : PCI_BRIDGE_MEM_MIN;
if (!pci_bridge_has_region(s->bus_dev, type))
continue;
u64 size = 0;
if (qemu_cap) {
u32 tmp_size;
u64 tmp_size_64;
switch(type) {
case PCI_REGION_TYPE_IO:
tmp_size_64 = (pci_config_readl(bdf, qemu_cap + RES_RESERVE_IO) |
(u64)pci_config_readl(bdf, qemu_cap + RES_RESERVE_IO + 4) << 32);
if (tmp_size_64 != (u64)-1) {
size = tmp_size_64;
}
break;
case PCI_REGION_TYPE_MEM:
tmp_size = pci_config_readl(bdf, qemu_cap + RES_RESERVE_MEM);
if (tmp_size != (u32)-1) {
size = tmp_size;
}
break;
case PCI_REGION_TYPE_PREFMEM:
tmp_size = pci_config_readl(bdf, qemu_cap + RES_RESERVE_PREF_MEM_32);
tmp_size_64 = (pci_config_readl(bdf, qemu_cap + RES_RESERVE_PREF_MEM_64) |
(u64)pci_config_readl(bdf, qemu_cap + RES_RESERVE_PREF_MEM_64 + 4) << 32);
if (tmp_size != (u32)-1 && tmp_size_64 == (u64)-1) {
size = tmp_size;
} else if (tmp_size == (u32)-1 && tmp_size_64 != (u64)-1) {
size = tmp_size_64;
} else if (tmp_size != (u32)-1 && tmp_size_64 != (u64)-1) {
dprintf(1, "PCI: resource reserve cap PREF32 and PREF64"
" conflict\n");
}
break;
default:
break;
}
}
if (pci_region_align(&s->r[type]) > align)
align = pci_region_align(&s->r[type]);
u64 sum = pci_region_sum(&s->r[type]);
int resource_optional = pcie_cap && (type == PCI_REGION_TYPE_IO);
if (!sum && hotplug_support && !resource_optional)
sum = align; /* reserve min size for hot-plug */
if (size > sum) {
dprintf(1, "PCI: QEMU resource reserve cap: "
"size %08llx type %s\n",
size, region_type_name[type]);
if (type != PCI_REGION_TYPE_IO) {
size = ALIGN(size, align);
}
} else {
size = ALIGN(sum, align);
}
int is64 = pci_bios_bridge_region_is64(&s->r[type],
s->bus_dev, type);
// entry->bar is -1 if the entry represents a bridge region
struct pci_region_entry *entry = pci_region_create_entry(
parent, s->bus_dev, -1, size, align, type, is64);
if (!entry)
return -1;
dprintf(1, "PCI: secondary bus %d size %08llx type %s\n",
entry->dev->secondary_bus, size,
region_type_name[entry->type]);
}
}
return 0;
}
/****************************************************************
* BAR assignment
****************************************************************/
// Setup region bases (given the regions' size and alignment)
static int pci_bios_init_root_regions_io(struct pci_bus *bus)
{
/*
* QEMU I/O address space usage:
* 0000 - 0fff legacy isa, pci config, pci root bus, ...
* 1000 - 9fff free
* a000 - afff hotplug (cpu, pci via acpi, i440fx/piix only)
* b000 - bfff power management (PORT_ACPI_PM_BASE)
* [ qemu 1.4+ implements pci config registers
* properly so guests can place the registers
* where they want, on older versions its fixed ]
* c000 - ffff free, traditionally used for pci io
*/
struct pci_region *r_io = &bus->r[PCI_REGION_TYPE_IO];
u64 sum = pci_region_sum(r_io);
if (sum < 0x4000) {
/* traditional region is big enougth, use it */
r_io->base = 0xc000;
} else if (sum < pci_io_low_end - 0x1000) {
/* use the larger region at 0x1000 */
r_io->base = 0x1000;
} else {
/* not enouth io address space -> error out */
return -1;
}
dprintf(1, "PCI: IO: %4llx - %4llx\n", r_io->base, r_io->base + sum - 1);
return 0;
}
static int pci_bios_init_root_regions_mem(struct pci_bus *bus)
{
struct pci_region *r_end = &bus->r[PCI_REGION_TYPE_PREFMEM];
struct pci_region *r_start = &bus->r[PCI_REGION_TYPE_MEM];
if (pci_region_align(r_start) < pci_region_align(r_end)) {
// Swap regions to improve alignment.
r_end = r_start;
r_start = &bus->r[PCI_REGION_TYPE_PREFMEM];
}
u64 sum = pci_region_sum(r_end);
u64 align = pci_region_align(r_end);
r_end->base = ALIGN_DOWN((pcimem_end - sum), align);
sum = pci_region_sum(r_start);
align = pci_region_align(r_start);
r_start->base = ALIGN_DOWN((r_end->base - sum), align);
if ((r_start->base < pcimem_start) ||
(r_start->base > pcimem_end))
// Memory range requested is larger than available.
return -1;
return 0;
}
#define PCI_IO_SHIFT 8
#define PCI_MEMORY_SHIFT 16
#define PCI_PREF_MEMORY_SHIFT 16
static void
pci_region_map_one_entry(struct pci_region_entry *entry, u64 addr)
{
if (entry->bar >= 0) {
dprintf(1, "PCI: map device bdf=%pP"
" bar %d, addr %08llx, size %08llx [%s]\n",
entry->dev,
entry->bar, addr, entry->size, region_type_name[entry->type]);
pci_set_io_region_addr(entry->dev, entry->bar, addr, entry->is64);
return;
}
u16 bdf = entry->dev->bdf;
u64 limit = addr + entry->size - 1;
if (entry->type == PCI_REGION_TYPE_IO) {
pci_config_writeb(bdf, PCI_IO_BASE, addr >> PCI_IO_SHIFT);
pci_config_writew(bdf, PCI_IO_BASE_UPPER16, 0);
pci_config_writeb(bdf, PCI_IO_LIMIT, limit >> PCI_IO_SHIFT);
pci_config_writew(bdf, PCI_IO_LIMIT_UPPER16, 0);
}
if (entry->type == PCI_REGION_TYPE_MEM) {
pci_config_writew(bdf, PCI_MEMORY_BASE, addr >> PCI_MEMORY_SHIFT);
pci_config_writew(bdf, PCI_MEMORY_LIMIT, limit >> PCI_MEMORY_SHIFT);
}
if (entry->type == PCI_REGION_TYPE_PREFMEM) {
pci_config_writew(bdf, PCI_PREF_MEMORY_BASE, addr >> PCI_PREF_MEMORY_SHIFT);
pci_config_writew(bdf, PCI_PREF_MEMORY_LIMIT, limit >> PCI_PREF_MEMORY_SHIFT);
pci_config_writel(bdf, PCI_PREF_BASE_UPPER32, addr >> 32);
pci_config_writel(bdf, PCI_PREF_LIMIT_UPPER32, limit >> 32);
}
}
static void pci_region_map_entries(struct pci_bus *busses, struct pci_region *r)
{
struct hlist_node *n;
struct pci_region_entry *entry;
hlist_for_each_entry_safe(entry, n, &r->list, node) {
u64 addr = r->base;
r->base += entry->size;
if (entry->bar == -1)
// Update bus base address if entry is a bridge region
busses[entry->dev->secondary_bus].r[entry->type].base = addr;
pci_region_map_one_entry(entry, addr);
hlist_del(&entry->node);
free(entry);
}
}
static void pci_bios_map_devices(struct pci_bus *busses)
{
if (pci_bios_init_root_regions_io(busses))
panic("PCI: out of I/O address space\n");
dprintf(1, "PCI: 32: %016llx - %016llx\n", pcimem_start, pcimem_end);
if (pci_bios_init_root_regions_mem(busses)) {
struct pci_region r64_mem, r64_pref;
r64_mem.list.first = NULL;
r64_pref.list.first = NULL;
pci_region_migrate_64bit_entries(&busses[0].r[PCI_REGION_TYPE_MEM],
&r64_mem);
pci_region_migrate_64bit_entries(&busses[0].r[PCI_REGION_TYPE_PREFMEM],
&r64_pref);
if (pci_bios_init_root_regions_mem(busses))
panic("PCI: out of 32bit address space\n");
u64 sum_mem = pci_region_sum(&r64_mem);
u64 sum_pref = pci_region_sum(&r64_pref);
u64 align_mem = pci_region_align(&r64_mem);
u64 align_pref = pci_region_align(&r64_pref);
r64_mem.base = le64_to_cpu(romfile_loadint("etc/reserved-memory-end", 0));
if (r64_mem.base < 0x100000000LL + RamSizeOver4G)
r64_mem.base = 0x100000000LL + RamSizeOver4G;
r64_mem.base = ALIGN(r64_mem.base, align_mem);
r64_mem.base = ALIGN(r64_mem.base, (1LL<<30)); // 1G hugepage
r64_pref.base = r64_mem.base + sum_mem;
r64_pref.base = ALIGN(r64_pref.base, align_pref);
r64_pref.base = ALIGN(r64_pref.base, (1LL<<30)); // 1G hugepage
pcimem64_start = r64_mem.base;
pcimem64_end = r64_pref.base + sum_pref;
pcimem64_end = ALIGN(pcimem64_end, (1LL<<30)); // 1G hugepage
dprintf(1, "PCI: 64: %016llx - %016llx\n", pcimem64_start, pcimem64_end);
pci_region_map_entries(busses, &r64_mem);
pci_region_map_entries(busses, &r64_pref);
} else {
// no bars mapped high -> drop 64bit window (see dsdt)
pcimem64_start = 0;
}
// Map regions on each device.
int bus;
for (bus = 0; bus<=MaxPCIBus; bus++) {
int type;
for (type = 0; type < PCI_REGION_TYPE_COUNT; type++)
pci_region_map_entries(busses, &busses[bus].r[type]);
}
}
/****************************************************************
* Main setup code
****************************************************************/
void
pci_setup(void)
{
if (!CONFIG_QEMU)
return;
dprintf(3, "pci setup\n");
dprintf(1, "=== PCI bus & bridge init ===\n");
if (pci_probe_host() != 0) {
return;
}
pci_bios_init_bus();
dprintf(1, "=== PCI device probing ===\n");
pci_probe_devices();
pcimem_start = RamSize;
pci_bios_init_platform();
dprintf(1, "=== PCI new allocation pass #1 ===\n");
struct pci_bus *busses = malloc_tmp(sizeof(*busses) * (MaxPCIBus + 1));
if (!busses) {
warn_noalloc();
return;
}
memset(busses, 0, sizeof(*busses) * (MaxPCIBus + 1));
if (pci_bios_check_devices(busses))
return;
dprintf(1, "=== PCI new allocation pass #2 ===\n");
pci_bios_map_devices(busses);
pci_bios_init_devices();
free(busses);
pci_enable_default_vga();
}