On 1/29/21 4:18 AM, 谢华伟(此时此刻） wrote:

|From: "huawei.xhw" [off-list ref] With IO BAR, we get
PIO(programmed IO) address. With MMIO BAR, we get mapped virtual
address. We distinguish PIO(Programmed IO) and MMIO(memory mapped IO) by
their address like how kernel does. ioread/write8/16/32 is provided to
access PIO/MMIO. By the way, for virtio on arch other than x86, BAR flag
indicates PIO but is mapped. Signed-off-by: huawei xie
[off-list ref] Reviewed-by: Maxime Coquelin
[off-list ref] --- drivers/bus/pci/linux/pci.c | 4 --
drivers/bus/pci/linux/pci_uio.c | 124
++++++++++++++++++++++++++-------------- 2 files changed, 81
insertions(+), 47 deletions(-)|

Reviewed-by: Maxime Coquelin <redacted>

Thanks,
Maxime