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[pci] Generalise pci_num_bus() to pci_discover() 

Allow pci_find_next() to discover devices beyond the first PCI
segment, by generalising pci_num_bus() (which implicitly assumes that
there is only a single PCI segment) with pci_discover() (which has the
ability to return an arbitrary contiguous chunk of PCI bus:dev.fn
address space).

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/583/merge
Michael Brown 2022-09-15 16:47:04 +01:00
parent 56b30364c5
commit ff228f745c
10 changed files with 78 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/arch/x86/core/pcidirect.c
View File

@ -45,7 +45,7 @@ void pcidirect_prepare ( struct pci_device *pci, int where ) {
PCIDIRECT_CONFIG_ADDRESS );
}
PROVIDE_PCIAPI_INLINE ( direct, pci_num_bus );
PROVIDE_PCIAPI_INLINE ( direct, pci_discover );
PROVIDE_PCIAPI_INLINE ( direct, pci_read_config_byte );
PROVIDE_PCIAPI_INLINE ( direct, pci_read_config_word );
PROVIDE_PCIAPI_INLINE ( direct, pci_read_config_dword );

14
src/arch/x86/include/ipxe/pcidirect.h
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@ -26,14 +26,18 @@ struct pci_device;
extern void pcidirect_prepare ( struct pci_device *pci, int where );
/**
* Determine number of PCI buses within system
* Find next PCI bus:dev.fn address range in system
*
* @ret num_bus Number of buses
* @v busdevfn Starting PCI bus:dev.fn address
* @v range PCI bus:dev.fn address range to fill in
*/
static inline __always_inline int
PCIAPI_INLINE ( direct, pci_num_bus ) ( void ) {
static inline __always_inline void
PCIAPI_INLINE ( direct, pci_discover ) ( uint32_t busdevfn __unused,
struct pci_range *range ) {
/* Scan first bus and rely on bridge detection to find higher buses */
return 1;
range->start = PCI_BUSDEVFN ( 0, 0, 0, 0 );
range->count = PCI_BUSDEVFN ( 0, 1, 0, 0 );
}
/**

14
src/arch/x86/interface/pcbios/pcibios.c
View File

@ -34,11 +34,13 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
*/
/**
* Determine number of PCI buses within system
* Find next PCI bus:dev.fn address range in system
*
* @ret num_bus Number of buses
* @v busdevfn Starting PCI bus:dev.fn address
* @v range PCI bus:dev.fn address range to fill in
*/
static int pcibios_num_bus ( void ) {
static void pcibios_discover ( uint32_t busdevfn __unused,
struct pci_range *range ) {
int discard_a, discard_D;
uint8_t max_bus;
@ -57,7 +59,9 @@ static int pcibios_num_bus ( void ) {
"D" ( 0 )
: "ebx", "edx" );
return ( max_bus + 1 );
/* Populate range */
range->start = PCI_BUSDEVFN ( 0, 0, 0, 0 );
range->count = PCI_BUSDEVFN ( 0, ( max_bus + 1 ), 0, 0 );
}
/**
@ -114,7 +118,7 @@ int pcibios_write ( struct pci_device *pci, uint32_t command, uint32_t value ){
return ( status >> 8 );
}
PROVIDE_PCIAPI ( pcbios, pci_num_bus, pcibios_num_bus );
PROVIDE_PCIAPI ( pcbios, pci_discover, pcibios_discover );
PROVIDE_PCIAPI_INLINE ( pcbios, pci_read_config_byte );
PROVIDE_PCIAPI_INLINE ( pcbios, pci_read_config_word );
PROVIDE_PCIAPI_INLINE ( pcbios, pci_read_config_dword );

34
src/drivers/bus/pci.c
View File

@ -233,18 +233,23 @@ int pci_read_config ( struct pci_device *pci ) {
* @ret rc Return status code
*/
int pci_find_next ( struct pci_device *pci, uint32_t *busdevfn ) {
static unsigned int end;
unsigned int sub_end;
static struct pci_range range;
uint8_t hdrtype;
uint8_t sub;
uint32_t end;
unsigned int count;
int rc;
/* Determine number of PCI buses */
if ( ! end )
end = PCI_BUSDEVFN ( 0, pci_num_bus(), 0, 0 );
/* Find next PCI device, if any */
for ( ; *busdevfn < end ; (*busdevfn)++ ) {
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 ) );
@ -252,24 +257,27 @@ int pci_find_next ( struct pci_device *pci, uint32_t *busdevfn ) {
if ( ( rc = pci_read_config ( pci ) ) != 0 )
continue;
/* If device is a bridge, expand the number of PCI
* buses as needed.
/* 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 );
sub_end = PCI_BUSDEVFN ( 0, ( sub + 1 ), 0, 0 );
if ( end < sub_end ) {
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 );
end = sub_end;
range.count = count;
}
}
/* Return this device */
return 0;
}
} while ( ++(*busdevfn) );
return -ENODEV;
}

13
src/include/ipxe/efi/efi_pci_api.h
View File

@ -33,14 +33,17 @@ extern int efipci_write ( struct pci_device *pci, unsigned long location,
unsigned long value );
/**
* Determine number of PCI buses within system
* Find next PCI bus:dev.fn address range in system
*
* @ret num_bus Number of buses
* @v busdevfn Starting PCI bus:dev.fn address
* @v range PCI bus:dev.fn address range to fill in
*/
static inline __always_inline int
PCIAPI_INLINE ( efi, pci_num_bus ) ( void ) {
static inline __always_inline void
PCIAPI_INLINE ( efi, pci_discover ) ( uint32_t busdevfn __unused,
struct pci_range *range ) {
/* EFI does not want us to scan the PCI bus ourselves */
return 0;
range->count = 0;
}
/**

16
src/include/ipxe/linux/linux_pci.h
View File

@ -23,14 +23,18 @@ extern int linux_pci_write ( struct pci_device *pci, unsigned long where,
unsigned long value, size_t len );
/**
* Determine number of PCI buses within system
* Find next PCI bus:dev.fn address range in system
*
* @ret num_bus Number of buses
* @v busdevfn Starting PCI bus:dev.fn address
* @v range PCI bus:dev.fn address range to fill in
*/
static inline __always_inline int
PCIAPI_INLINE ( linux, pci_num_bus ) ( void ) {
/* Assume all buses may exist */
return 0x100;
static inline __always_inline void
PCIAPI_INLINE ( linux, pci_discover ) ( uint32_t busdevfn __unused,
struct pci_range *range ) {
/* Assume all buses in segment 0 may exist */
range->start = PCI_BUSDEVFN ( 0, 0, 0, 0 );
range->count = PCI_BUSDEVFN ( 1, 0, 0, 0 );
}
/**

3
src/include/ipxe/pci.h
View File

@ -262,9 +262,6 @@ struct pci_driver {
#define PCI_BUS( busdevfn ) ( ( (busdevfn) >> 8 ) & 0xff )
#define PCI_SLOT( busdevfn ) ( ( (busdevfn) >> 3 ) & 0x1f )
#define PCI_FUNC( busdevfn ) ( ( (busdevfn) >> 0 ) & 0x07 )
#define PCI_BUSDEVFN( segment, bus, slot, func ) \
( ( (segment) << 16 ) | ( (bus) << 8 ) | \
( (slot) << 3 ) | ( (func) << 0 ) )
#define PCI_FIRST_FUNC( busdevfn ) ( (busdevfn) & ~0x07 )
#define PCI_LAST_FUNC( busdevfn ) ( (busdevfn) | 0x07 )

21
src/include/ipxe/pci_io.h
View File

@ -14,6 +14,20 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <ipxe/iomap.h>
#include <config/ioapi.h>
struct pci_device;
/** A PCI bus:dev.fn address range */
struct pci_range {
/** Starting bus:dev.fn address */
uint32_t start;
/** Number of bus:dev.fn addresses within this range */
unsigned int count;
};
#define PCI_BUSDEVFN( segment, bus, slot, func ) \
( ( (segment) << 16 ) | ( (bus) << 8 ) | \
( (slot) << 3 ) | ( (func) << 0 ) )
/**
* Calculate static inline PCI I/O API function name
*
@ -51,11 +65,12 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <bits/pci_io.h>
/**
* Determine number of PCI buses within system
* Find next PCI bus:dev.fn address range in system
*
* @ret num_bus Number of buses
* @v busdevfn Starting PCI bus:dev.fn address
* @v range PCI bus:dev.fn address range to fill in
*/
int pci_num_bus ( void );
void pci_discover ( uint32_t busdevfn, struct pci_range *range );
/**
* Read byte from PCI configuration space

2
src/interface/efi/efi_pci.c
View File

@ -362,7 +362,7 @@ void * efipci_ioremap ( struct pci_device *pci, unsigned long bus_addr,
return ioremap ( bus_addr, len );
}
PROVIDE_PCIAPI_INLINE ( efi, pci_num_bus );
PROVIDE_PCIAPI_INLINE ( efi, pci_discover );
PROVIDE_PCIAPI_INLINE ( efi, pci_read_config_byte );
PROVIDE_PCIAPI_INLINE ( efi, pci_read_config_word );
PROVIDE_PCIAPI_INLINE ( efi, pci_read_config_dword );

2
src/interface/linux/linux_pci.c
View File

@ -188,7 +188,7 @@ int linux_pci_write ( struct pci_device *pci, unsigned long where,
return rc;
}
PROVIDE_PCIAPI_INLINE ( linux, pci_num_bus );
PROVIDE_PCIAPI_INLINE ( linux, pci_discover );
PROVIDE_PCIAPI_INLINE ( linux, pci_read_config_byte );
PROVIDE_PCIAPI_INLINE ( linux, pci_read_config_word );
PROVIDE_PCIAPI_INLINE ( linux, pci_read_config_dword );