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s390/pci: define kernel parameters for PCI multifunction

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Using PCI multifunctions in S390 is a new feature we may want
to ignore to continue provide the same topology as in the past
to userland even if the configuration supports exposing the
topology of a multi-Function device.

A new boolean parameters allows to overwrite the kernel
pci configuration:

- pci=norid when on, disallow the use a new firmware field,
  RID, which provides the PCI <bus>:<device>.<function> part
  of the PCI address.

To be used in the following patches and satisfy the checkpatch.pl
the variable is exposed in pci.h

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Pierre Morel 2020-02-07 13:35:08 +01:00 committed by Vasily Gorbik
parent d08d6f5d75
commit 6cf17f9a67
2 changed files with 7 additions and 0 deletions
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1
arch/s390/include/asm/pci.h
View File

@ -168,6 +168,7 @@ static inline bool zdev_enabled(struct zpci_dev *zdev)
extern const struct attribute_group *zpci_attr_groups[];
extern unsigned int s390_pci_force_floating __initdata;
extern unsigned int s390_pci_no_rid;
/* -----------------------------------------------------------------------------
Prototypes

6
arch/s390/pci/pci.c
View File

@ -48,6 +48,8 @@ static unsigned int zpci_num_domains_allocated;
min(((unsigned long) ZPCI_NR_DEVICES * PCI_STD_NUM_BARS / 2), \
ZPCI_IOMAP_MAX_ENTRIES)
unsigned int s390_pci_no_rid;
static DEFINE_SPINLOCK(zpci_iomap_lock);
static unsigned long *zpci_iomap_bitmap;
struct zpci_iomap_entry *zpci_iomap_start;
@ -844,6 +846,10 @@ char * __init pcibios_setup(char *str)
s390_pci_force_floating = 1;
return NULL;
}
if (!strcmp(str, "norid")) {
s390_pci_no_rid = 1;
return NULL;
}
return str;
}