5a37a60a62
FreeBSD supports lazy allocation of PCI BAR, that is, when a device driver's attach method is invoked, even if the device's PCI BAR address wasn't initialized, the invocation of bus_alloc_resource_any() (the call chain: pci_alloc_resource() -> pci_alloc_multi_resource() -> pci_reserve_map() -> pci_write_bar()) would allocate a proper address for the PCI BAR and write this 'lazy allocated' address into the PCI BAR. This model works fine for native FreeBSD device drivers, but _not_ for device drivers shared with Linux (e.g. dev/mlx5/mlx5_core/mlx5_main.c and ofed/drivers/net/mlx4/main.c. Both of them use pci_request_regions(), which doesn't work properly with the PCI BAR lazy allocation, because pci_resource_type() -> _pci_get_rle() always returns NULL, so pci_request_regions() doesn't have the opportunity to invoke bus_alloc_resource_any(). We now use pci_find_bar() in pci_resource_type(), which is able to locate all available PCI BARs even if some of them will be lazy allocated. Submitted by: Dexuan Cui <decui microsoft com> Reviewed by: hps MFC after: 1 week Sponsored by: Microsoft Differential Revision: https://reviews.freebsd.org/D8071 |
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| cloudabi | ||
| cloudabi32 | ||
| cloudabi64 | ||
| freebsd32 | ||
| ia32 | ||
| linprocfs | ||
| linsysfs | ||
| linux | ||
| linuxkpi/common | ||
| ndis | ||
| netbsd | ||
| svr4 | ||
| x86bios | ||