pci.c File Reference

PCI bus. More...

#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <ipxe/tables.h>
#include <ipxe/device.h>
#include <ipxe/pci.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
static void	pcibus_remove (struct root_device *rootdev)
	Remove PCI root bus. More...
static unsigned long	pci_bar (struct pci_device *pci, unsigned int reg)
	Read PCI BAR. More...
unsigned long	pci_bar_start (struct pci_device *pci, unsigned int reg)
	Find the start of a PCI BAR. More...
void	pci_bar_set (struct pci_device *pci, unsigned int reg, unsigned long start)
	Set the start of a PCI BAR. More...
unsigned long	pci_bar_size (struct pci_device *pci, unsigned int reg)
	Get the size of a PCI BAR. More...
static void	pci_read_bases (struct pci_device *pci)
	Read membase and ioaddr for a PCI device. More...
void	adjust_pci_device (struct pci_device *pci)
	Enable PCI device. More...
int	pci_read_config (struct pci_device *pci)
	Read PCI device configuration. More...
int	pci_find_next (struct pci_device *pci, uint32_t *busdevfn)
	Find next device on PCI bus. More...
int	pci_find_driver (struct pci_device *pci)
	Find driver for PCI device. More...
int	pci_probe (struct pci_device *pci)
	Probe a PCI device. More...
void	pci_remove (struct pci_device *pci)
	Remove a PCI device. More...
static int	pcibus_probe (struct root_device *rootdev)
	Probe PCI root bus. More...
	REQUIRING_SYMBOL (pcibus_probe)
	REQUIRE_OBJECT (config_pci)

Variables
static struct root_driver	pci_root_driver
	PCI bus root device driver. More...
struct root_device pci_root_device	__root_device
	PCI bus root device. More...

Detailed Description

PCI bus.

Definition in file pci.c.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

pcibus_remove()

static void pcibus_remove ( struct root_device *  rootdev )

static

Remove PCI root bus.

Parameters

rootdev

PCI bus root device

Definition at line 504 of file pci.c.

                                                          {
        struct pci_device *pci;
        struct pci_device *tmp;

        list_for_each_entry_safe ( pci, tmp, &rootdev->dev.children,
                                   dev.siblings ) {
                pci_remove ( pci );
                list_del ( &pci->dev.siblings );
                free ( pci );
        }
}

References device::children, root_device::dev, pci_device::dev, free, list_del, list_for_each_entry_safe, pci_remove(), device::siblings, and tmp.

Referenced by pcibus_probe().

pci_bar()

static unsigned long pci_bar ( struct pci_device *  pci, unsigned int  reg  )

static

Read PCI BAR.

Parameters

pci	PCI device
reg	PCI register number

Return values

bar	Base address register

Reads the specified PCI base address register, including the flags portion. 64-bit BARs will be handled automatically. If the value of the 64-bit BAR exceeds the size of an unsigned long (i.e. if the high dword is non-zero on a 32-bit platform), then the value returned will be zero plus the flags for a 64-bit BAR. Unreachable 64-bit BARs are therefore returned as uninitialised 64-bit BARs.

Definition at line 60 of file pci.c.

                                                                          {
        uint32_t low;
        uint32_t high;

        pci_read_config_dword ( pci, reg, &low );
        if ( ( low & (PCI_BASE_ADDRESS_SPACE_IO|PCI_BASE_ADDRESS_MEM_TYPE_MASK))
             == PCI_BASE_ADDRESS_MEM_TYPE_64 ) {
                pci_read_config_dword ( pci, reg + 4, &high );
                if ( high ) {
                        if ( sizeof ( unsigned long ) > sizeof ( uint32_t ) ) {
                                return ( ( ( uint64_t ) high << 32 ) | low );
                        } else {
                                DBGC ( pci, PCI_FMT " unhandled 64-bit BAR "
                                       "%08x%08x\n",
                                       PCI_ARGS ( pci ), high, low );
                                return PCI_BASE_ADDRESS_MEM_TYPE_64;
                        }
                }
        }
        return low;
}

References DBGC, high, low, PCI_ARGS, PCI_BASE_ADDRESS_MEM_TYPE_64, PCI_BASE_ADDRESS_MEM_TYPE_MASK, PCI_BASE_ADDRESS_SPACE_IO, PCI_FMT, pci_read_config_dword(), and reg.

Referenced by pci_bar_start(), and pci_read_bases().

pci_bar_start()

unsigned long pci_bar_start	(	struct pci_device *	pci,
		unsigned int	reg
	)

Find the start of a PCI BAR.

Parameters

pci	PCI device
reg	PCI register number

Return values

start

BAR start address

Reads the specified PCI base address register, and returns the address portion of the BAR (i.e. without the flags).

If the address exceeds the size of an unsigned long (i.e. if a 64-bit BAR has a non-zero high dword on a 32-bit machine), the return value will be zero.

Definition at line 96 of file pci.c.

                                                                         {
        unsigned long bar;

        bar = pci_bar ( pci, reg );
        if ( bar & PCI_BASE_ADDRESS_SPACE_IO ) {
                return ( bar & ~PCI_BASE_ADDRESS_IO_MASK );
        } else {
                return ( bar & ~PCI_BASE_ADDRESS_MEM_MASK );
        }
}

References pci_bar(), PCI_BASE_ADDRESS_IO_MASK, PCI_BASE_ADDRESS_MEM_MASK, PCI_BASE_ADDRESS_SPACE_IO, and reg.

Referenced by amd8111e_probe(), arbel_probe(), bnx2_init_board(), bnxt_pci_base(), dmfe_probe(), efab_probe(), efx_probe(), ehci_probe(), ena_membases(), exanic_probe(), flexboot_nodnic_alloc_uar(), forcedeth_map_regs(), golan_alloc_uar(), golan_pci_init(), gve_probe(), hermon_bofm_probe(), hermon_probe(), hvm_probe(), igbvf_probe(), mlx_pci_init_priv(), pci_bar_size(), pci_msix_ioremap(), phantom_map_crb(), skge_probe(), sky2_probe(), tg3_init_one(), undipci_find_rom(), virtio_pci_map_capability(), vmxnet3_probe(), vxge_probe(), and xhci_probe().

pci_bar_set()

void pci_bar_set	(	struct pci_device *	pci,
		unsigned int	reg,
		unsigned long	start
	)

Set the start of a PCI BAR.

Parameters

pci	PCI device
reg	PCI register number
start	BAR start address

Definition at line 114 of file pci.c.

                                         {
        unsigned int type;
        uint32_t low;
        uint32_t high;
        uint16_t cmd;

        /* Save the original command register and disable decoding */
        pci_read_config_word ( pci, PCI_COMMAND, &cmd );
        pci_write_config_word ( pci, PCI_COMMAND,
                                ( cmd & ~( PCI_COMMAND_MEM |
                                           PCI_COMMAND_IO ) ) );

        /* Check for a 64-bit BAR */
        pci_read_config_dword ( pci, reg, &low );
        type = ( low & ( PCI_BASE_ADDRESS_SPACE_IO |
                         PCI_BASE_ADDRESS_MEM_TYPE_MASK ) );

        /* Write low 32 bits */
        low = start;
        pci_write_config_dword ( pci, reg, low );

        /* Write high 32 bits, if applicable */
        if ( type == PCI_BASE_ADDRESS_MEM_TYPE_64 ) {
                if ( sizeof ( unsigned long ) > sizeof ( uint32_t ) ) {
                        high = ( ( ( uint64_t ) start ) >> 32 );
                } else {
                        high = 0;
                }
                pci_write_config_dword ( pci, reg + 4, high );
        }

        /* Restore the original command register */
        pci_write_config_word ( pci, PCI_COMMAND, cmd );
}

References cmd, high, low, PCI_BASE_ADDRESS_MEM_TYPE_64, PCI_BASE_ADDRESS_MEM_TYPE_MASK, PCI_BASE_ADDRESS_SPACE_IO, PCI_COMMAND, PCI_COMMAND_IO, PCI_COMMAND_MEM, pci_read_config_dword(), pci_read_config_word(), pci_write_config_dword(), pci_write_config_word(), reg, start, and type.

Referenced by ena_membases(), and pci_bar_size().

pci_bar_size()

unsigned long pci_bar_size	(	struct pci_device *	pci,
		unsigned int	reg
	)

Get the size of a PCI BAR.

Parameters

pci	PCI device
reg	PCI register number

Return values

size

BAR size

Most drivers should not need to call this function. It is not necessary to map the whole PCI BAR, only the portion that will be used for register access. Since register offsets are almost always fixed by hardware design, the length of the mapped portion will almost always be a compile-time constant.

Definition at line 163 of file pci.c.

                                                                        {
        unsigned long start;
        unsigned long size;
        uint16_t cmd;

        /* Save the original command register and disable decoding */
        pci_read_config_word ( pci, PCI_COMMAND, &cmd );
        pci_write_config_word ( pci, PCI_COMMAND,
                                ( cmd & ~( PCI_COMMAND_MEM |
                                           PCI_COMMAND_IO ) ) );

        /* Save the original start address */
        start = pci_bar_start ( pci, reg );

        /* Set all possible bits */
        pci_bar_set ( pci, reg, -1UL );

        /* Determine size by finding lowest set bit */
        size = pci_bar_start ( pci, reg );
        size &= ( -size );

        /* Restore the original start address */
        pci_bar_set ( pci, reg, start );

        /* Restore the original command register */
        pci_write_config_word ( pci, PCI_COMMAND, cmd );

        return size;
}

References cmd, pci_bar_set(), pci_bar_start(), PCI_COMMAND, PCI_COMMAND_IO, PCI_COMMAND_MEM, pci_read_config_word(), pci_write_config_word(), reg, size, and start.

Referenced by __vxge_hw_device_get_legacy_reg(), amd8111e_probe(), bnxt_pci_base(), efab_probe(), efx_probe(), ehci_probe(), ena_membases(), exanic_probe(), forcedeth_map_regs(), gve_probe(), hvm_probe(), igbvf_probe(), phantom_map_crb(), tg3_init_one(), virtio_pci_map_capability(), vxge_probe(), and xhci_probe().

pci_read_bases()

static void pci_read_bases ( struct pci_device *  pci )

static

Read membase and ioaddr for a PCI device.

Parameters

pci	PCI device

This scans through all PCI BARs on the specified device. The first valid memory BAR is recorded as pci_device::membase, and the first valid IO BAR is recorded as pci_device::ioaddr.

64-bit BARs are handled automatically. On a 32-bit platform, if a 64-bit BAR has a non-zero high dword, it will be regarded as invalid.

Definition at line 206 of file pci.c.

                                                      {
        unsigned long bar;
        int reg;

        /* Clear any existing base addresses */
        pci->ioaddr = 0;
        pci->membase = 0;

        /* Get first memory and I/O BAR addresses */
        for ( reg = PCI_BASE_ADDRESS_0; reg <= PCI_BASE_ADDRESS_5; reg += 4 ) {
                bar = pci_bar ( pci, reg );
                if ( bar & PCI_BASE_ADDRESS_SPACE_IO ) {
                        if ( ! pci->ioaddr )
                                pci->ioaddr = 
                                        ( bar & ~PCI_BASE_ADDRESS_IO_MASK );
                } else {
                        if ( ! pci->membase )
                                pci->membase =
                                        ( bar & ~PCI_BASE_ADDRESS_MEM_MASK );
                        /* Skip next BAR if 64-bit */
                        if ( bar & PCI_BASE_ADDRESS_MEM_TYPE_64 )
                                reg += 4;
                }
        }
}

References pci_device::ioaddr, pci_device::membase, pci_bar(), PCI_BASE_ADDRESS_0, PCI_BASE_ADDRESS_5, PCI_BASE_ADDRESS_IO_MASK, PCI_BASE_ADDRESS_MEM_MASK, PCI_BASE_ADDRESS_MEM_TYPE_64, PCI_BASE_ADDRESS_SPACE_IO, and reg.

Referenced by pci_read_config().

adjust_pci_device()

void adjust_pci_device

(

struct pci_device *

pci

)

Enable PCI device.

Parameters

pci	PCI device

Set device to be a busmaster in case BIOS neglected to do so. Also adjust PCI latency timer to a reasonable value, 32.

Definition at line 240 of file pci.c.

                                                  {
        unsigned short new_command, pci_command;
        unsigned char pci_latency;

        pci_read_config_word ( pci, PCI_COMMAND, &pci_command );
        new_command = ( pci_command | PCI_COMMAND_MASTER |
                        PCI_COMMAND_MEM | PCI_COMMAND_IO );
        if ( pci_command != new_command ) {
                DBGC ( pci, PCI_FMT " device not enabled by BIOS! Updating "
                       "PCI command %04x->%04x\n",
                       PCI_ARGS ( pci ), pci_command, new_command );
                pci_write_config_word ( pci, PCI_COMMAND, new_command );
        }

        pci_read_config_byte ( pci, PCI_LATENCY_TIMER, &pci_latency);
        if ( pci_latency < 32 ) {
                DBGC ( pci, PCI_FMT " latency timer is unreasonably low at "
                       "%d. Setting to 32.\n", PCI_ARGS ( pci ), pci_latency );
                pci_write_config_byte ( pci, PCI_LATENCY_TIMER, 32);
        }
}

References DBGC, PCI_ARGS, PCI_COMMAND, PCI_COMMAND_IO, PCI_COMMAND_MASTER, PCI_COMMAND_MEM, PCI_FMT, PCI_LATENCY_TIMER, pci_read_config_byte(), pci_read_config_word(), pci_write_config_byte(), and pci_write_config_word().

Referenced by a3c90x_probe(), amd8111e_probe(), arbel_probe(), ath5k_probe(), ath_pci_probe(), atl1e_probe(), atl_probe(), b44_probe(), bnx2_init_board(), bnxt_init_one(), dmfe_probe(), efab_probe(), efx_probe(), ehci_probe(), ena_probe(), exanic_probe(), forcedeth_probe(), golan_pci_init(), gve_probe(), hermon_bofm_probe(), hermon_probe(), hvm_probe(), ice_probe(), icplus_probe(), ifec_pci_probe(), igbvf_probe(), intel_probe(), intelx_probe(), intelxl_probe(), intelxlvf_probe(), intelxvf_probe(), jme_probe(), linda_probe(), mlx_pci_init_priv(), myri10ge_pci_probe(), myson_probe(), natsemi_probe(), pcnet32_probe(), phantom_probe(), pnic_probe(), qib7322_probe(), rdc_probe(), realtek_probe(), rhine_probe(), rtl818x_probe(), sis190_init_board(), sis900_probe(), skeleton_probe(), skge_probe(), sky2_probe(), sundance_probe(), tg3_init_one(), tlan_probe(), tulip_probe(), txnic_bgx_probe(), txnic_pf_probe(), uhci_probe(), velocity_probe(), virtnet_probe_legacy(), virtnet_probe_modern(), vmxnet3_probe(), vxge_probe(), w89c840_probe(), and xhci_probe().

pci_read_config()

int pci_read_config

(

struct pci_device *

pci

)

Read PCI device configuration.

Parameters

pci	PCI device

Return values

rc	Return status code

Definition at line 268 of file pci.c.

                                               {
        uint32_t busdevfn;
        uint8_t hdrtype;
        uint32_t tmp;

        /* Ignore all but the first function on non-multifunction devices */
        if ( PCI_FUNC ( pci->busdevfn ) != 0 ) {
                busdevfn = pci->busdevfn;
                pci->busdevfn = PCI_FIRST_FUNC ( pci->busdevfn );
                pci_read_config_byte ( pci, PCI_HEADER_TYPE, &hdrtype );
                pci->busdevfn = busdevfn;
                if ( ! ( hdrtype & PCI_HEADER_TYPE_MULTI ) )
                        return -ENODEV;
        }

        /* Check for physical device presence */
        pci_read_config_dword ( pci, PCI_VENDOR_ID, &tmp );
        if ( ( tmp == 0xffffffff ) || ( tmp == 0 ) )
                return -ENODEV;

        /* Populate struct pci_device */
        pci->vendor = ( tmp & 0xffff );
        pci->device = ( tmp >> 16 );
        pci_read_config_dword ( pci, PCI_REVISION, &tmp );
        pci->class = ( tmp >> 8 );
        pci_read_config_byte ( pci, PCI_INTERRUPT_LINE, &pci->irq );
        pci_read_config_byte ( pci, PCI_HEADER_TYPE, &pci->hdrtype );
        pci_read_bases ( pci );

        /* Initialise generic device component */
        snprintf ( pci->dev.name, sizeof ( pci->dev.name ), "%04x:%02x:%02x.%x",
                   PCI_SEG ( pci->busdevfn ), PCI_BUS ( pci->busdevfn ),
                   PCI_SLOT ( pci->busdevfn ), PCI_FUNC ( pci->busdevfn ) );
        pci->dev.desc.bus_type = BUS_TYPE_PCI;
        pci->dev.desc.location = pci->busdevfn;
        pci->dev.desc.vendor = pci->vendor;
        pci->dev.desc.device = pci->device;
        pci->dev.desc.class = pci->class;
        pci->dev.desc.ioaddr = pci->ioaddr;
        pci->dev.desc.irq = pci->irq;
        INIT_LIST_HEAD ( &pci->dev.siblings );
        INIT_LIST_HEAD ( &pci->dev.children );

        return 0;
}

References device_description::bus_type, BUS_TYPE_PCI, busdevfn, pci_device::busdevfn, device::children, device_description::class, pci_device::class, device::desc, pci_device::dev, device_description::device, pci_device::device, ENODEV, pci_device::hdrtype, INIT_LIST_HEAD, device_description::ioaddr, pci_device::ioaddr, device_description::irq, pci_device::irq, device_description::location, device::name, PCI_BUS, PCI_FIRST_FUNC, PCI_FUNC, PCI_HEADER_TYPE, PCI_HEADER_TYPE_MULTI, PCI_INTERRUPT_LINE, pci_read_bases(), pci_read_config_byte(), pci_read_config_dword(), PCI_REVISION, PCI_SEG, PCI_SLOT, PCI_VENDOR_ID, device::siblings, snprintf(), tmp, device_description::vendor, and pci_device::vendor.

Referenced by bofm_test_init(), efipci_info(), ehci_companion(), and pci_find_next().

pci_find_next()

int pci_find_next	(	struct pci_device *	pci,
		uint32_t *	busdevfn
	)

Find next device on PCI bus.

Parameters

pci	PCI device to fill in
busdevfn	Starting bus:dev.fn address

Return values

busdevfn	Bus:dev.fn address of next PCI device
rc	Return status code

Definition at line 322 of file pci.c.

                                                                 {
        static struct pci_range range;
        uint8_t hdrtype;
        uint8_t sub;
        uint32_t end;
        unsigned int count;
        int rc;

        /* Find next PCI device, if any */
        do {
                /* Find next PCI bus:dev.fn address range, if necessary */
                if ( ( *busdevfn - range.start ) >= range.count ) {
                        pci_discover ( *busdevfn, &range );
                        if ( *busdevfn < range.start )
                                *busdevfn = range.start;
                        if ( ( *busdevfn - range.start ) >= range.count )
                                break;
                }

                /* Check for PCI device existence */
                memset ( pci, 0, sizeof ( *pci ) );
                pci_init ( pci, *busdevfn );
                if ( ( rc = pci_read_config ( pci ) ) != 0 )
                        continue;

                /* If device is a bridge, expand the PCI bus:dev.fn
                 * address range as needed.
                 */
                pci_read_config_byte ( pci, PCI_HEADER_TYPE, &hdrtype );
                hdrtype &= PCI_HEADER_TYPE_MASK;
                if ( hdrtype == PCI_HEADER_TYPE_BRIDGE ) {
                        pci_read_config_byte ( pci, PCI_SUBORDINATE, &sub );
                        end = PCI_BUSDEVFN ( PCI_SEG ( *busdevfn ),
                                             ( sub + 1 ), 0, 0 );
                        count = ( end - range.start );
                        if ( count > range.count ) {
                                DBGC ( pci, PCI_FMT " found subordinate bus "
                                       "%#02x\n", PCI_ARGS ( pci ), sub );
                                range.count = count;
                        }
                }

                /* Return this device */
                return 0;

        } while ( ++(*busdevfn) );

        return -ENODEV;
}

References busdevfn, pci_range::count, count, DBGC, end, ENODEV, memset(), PCI_ARGS, PCI_BUSDEVFN, pci_discover(), PCI_FMT, PCI_HEADER_TYPE, PCI_HEADER_TYPE_BRIDGE, PCI_HEADER_TYPE_MASK, pci_init(), pci_read_config(), pci_read_config_byte(), PCI_SEG, PCI_SUBORDINATE, range, rc, and pci_range::start.

Referenced by pcibus_probe(), and pciscan_exec().

pci_find_driver()

int pci_find_driver

(

struct pci_device *

pci

)

Find driver for PCI device.

Parameters

pci	PCI device

Return values

rc	Return status code

Definition at line 378 of file pci.c.

                                               {
        struct pci_driver *driver;
        struct pci_device_id *id;
        unsigned int i;

        for_each_table_entry ( driver, PCI_DRIVERS ) {
                if ( ( driver->class.class ^ pci->class ) & driver->class.mask )
                        continue;
                for ( i = 0 ; i < driver->id_count ; i++ ) {
                        id = &driver->ids[i];
                        if ( ( id->vendor != PCI_ANY_ID ) &&
                             ( id->vendor != pci->vendor ) )
                                continue;
                        if ( ( id->device != PCI_ANY_ID ) &&
                             ( id->device != pci->device ) )
                                continue;
                        pci_set_driver ( pci, driver, id );
                        return 0;
                }
        }
        return -ENOENT;
}

References pci_class_id::class, pci_device::class, pci_driver::class, pci_device::device, ENOENT, for_each_table_entry, id, pci_driver::id_count, pci_driver::ids, pci_class_id::mask, PCI_ANY_ID, PCI_DRIVERS, pci_set_driver(), and pci_device::vendor.

Referenced by efipci_start(), efipci_supported(), and pcibus_probe().

pci_probe()

int pci_probe

(

struct pci_device *

pci

)

Probe a PCI device.

Parameters

pci	PCI device

Return values

rc	Return status code

Searches for a driver for the PCI device. If a driver is found, its probe() routine is called.

Definition at line 410 of file pci.c.

                                         {
        int rc;

        DBGC ( pci, PCI_FMT " (%04x:%04x) has driver \"%s\"\n",
               PCI_ARGS ( pci ), pci->vendor, pci->device, pci->id->name );
        DBGC ( pci, PCI_FMT " has mem %lx io %lx irq %d\n",
               PCI_ARGS ( pci ), pci->membase, pci->ioaddr, pci->irq );

        if ( ( rc = pci->driver->probe ( pci ) ) != 0 ) {
                DBGC ( pci, PCI_FMT " probe failed: %s\n",
                       PCI_ARGS ( pci ), strerror ( rc ) );
                return rc;
        }

        return 0;
}

References DBGC, pci_device::device, pci_device::driver, pci_device::id, pci_device::ioaddr, pci_device::irq, pci_device::membase, pci_device_id::name, PCI_ARGS, PCI_FMT, pci_driver::probe, rc, strerror(), and pci_device::vendor.

Referenced by bofm_probe(), efipci_start(), and pcibus_probe().

pci_remove()

void pci_remove

(

struct pci_device *

pci

)

Remove a PCI device.

Parameters

pci	PCI device

Definition at line 432 of file pci.c.

                                           {
        pci->driver->remove ( pci );
        DBGC ( pci, PCI_FMT " removed\n", PCI_ARGS ( pci ) );
}

References DBGC, pci_device::driver, PCI_ARGS, PCI_FMT, and pci_driver::remove.

Referenced by bofm_remove(), efipci_start(), efipci_stop(), and pcibus_remove().

pcibus_probe()

static int pcibus_probe ( struct root_device *  rootdev )

static

Probe PCI root bus.

Parameters

rootdev

PCI bus root device

Scans the PCI bus for devices and registers all devices it can find.

Definition at line 445 of file pci.c.

                                                        {
        struct pci_device *pci = NULL;
        uint32_t busdevfn = 0;
        int rc;

        do {
                /* Allocate struct pci_device */
                if ( ! pci )
                        pci = malloc ( sizeof ( *pci ) );
                if ( ! pci ) {
                        rc = -ENOMEM;
                        goto err;
                }

                /* Find next PCI device, if any */
                if ( ( rc = pci_find_next ( pci, &busdevfn ) ) != 0 )
                        break;

                /* Skip automatic probing if prohibited */
                if ( ! pci_can_probe ( pci ) )
                        continue;

                /* Look for a driver */
                if ( ( rc = pci_find_driver ( pci ) ) != 0 ) {
                        DBGC ( pci, PCI_FMT " (%04x:%04x class %06x) has no "
                               "driver\n", PCI_ARGS ( pci ), pci->vendor,
                               pci->device, pci->class );
                        continue;
                }

                /* Add to device hierarchy */
                pci->dev.parent = &rootdev->dev;
                list_add ( &pci->dev.siblings, &rootdev->dev.children );

                /* Look for a driver */
                if ( ( rc = pci_probe ( pci ) ) == 0 ) {
                        /* pcidev registered, we can drop our ref */
                        pci = NULL;
                } else {
                        /* Not registered; re-use struct pci_device */
                        list_del ( &pci->dev.siblings );
                }

        } while ( ++busdevfn );

        free ( pci );
        return 0;

 err:
        free ( pci );
        pcibus_remove ( rootdev );
        return rc;
}

References busdevfn, device::children, pci_device::class, DBGC, root_device::dev, pci_device::dev, pci_device::device, ENOMEM, free, list_add, list_del, malloc(), NULL, device::parent, PCI_ARGS, pci_can_probe(), pci_find_driver(), pci_find_next(), PCI_FMT, pci_probe(), pcibus_remove(), rc, device::siblings, and pci_device::vendor.

REQUIRING_SYMBOL()

REQUIRING_SYMBOL

(

pcibus_probe

)

REQUIRE_OBJECT()

REQUIRE_OBJECT

(

config_pci

)

Variable Documentation

pci_root_driver

struct root_driver pci_root_driver

static

Initial value:

= {
        .probe = pcibus_probe,
        .remove = pcibus_remove,
}

PCI bus root device driver.

Definition at line 517 of file pci.c.

__root_device

struct root_device pci_root_device __root_device

Initial value:

= {
        .dev = { .name = "PCI" },
        .driver = &pci_root_driver,
}

PCI bus root device.

Definition at line 523 of file pci.c.