We found some discrete AMD graphics devices hide funtion 0 and the whole is not supposed to be probed.
Since our original purpose is to allow integrated devices (on bus 0) to be probed without function 0, we can limit the islolated function probing only on bus 0.
Cc: stable@vger.kernel.org Fixes: a02fd05661d73a8 ("PCI: Extend isolated function probing to LoongArch") Signed-off-by: Huacai Chen chenhuacai@loongson.cn --- drivers/pci/probe.c | 2 +- include/linux/hypervisor.h | 8 +++++--- 2 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index c83e75a0ec12..da6a2aef823a 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -2883,7 +2883,7 @@ int pci_scan_slot(struct pci_bus *bus, int devfn) * a hypervisor that passes through individual PCI * functions. */ - if (!hypervisor_isolated_pci_functions()) + if (!hypervisor_isolated_pci_functions(bus->number)) break; } fn = next_fn(bus, dev, fn); diff --git a/include/linux/hypervisor.h b/include/linux/hypervisor.h index be5417303ecf..30ece04a16d9 100644 --- a/include/linux/hypervisor.h +++ b/include/linux/hypervisor.h @@ -32,13 +32,15 @@ static inline bool jailhouse_paravirt(void)
#endif /* !CONFIG_X86 */
-static inline bool hypervisor_isolated_pci_functions(void) +static inline bool hypervisor_isolated_pci_functions(int bus) { if (IS_ENABLED(CONFIG_S390)) return true;
- if (IS_ENABLED(CONFIG_LOONGARCH)) - return true; + if (IS_ENABLED(CONFIG_LOONGARCH)) { + if (bus == 0) + return true; + }
return jailhouse_paravirt(); }