Hello,
> The current code uses writel()/readl(), which has an implicit memory
> barrier for every single readl()/writel().
>
> Additionally, reading 4 bytes at a time over the PCI bus is not really
> optimal, considering that this code is running in an ioctl handler.
>
> Use memcpy_toio()/memcpy_fromio() for BAR tests.
>
> Before patch with a 4MB BAR:
> $ time /usr/bin/pcitest -b 1
> BAR1: OKAY
> real 0m 1.56s
>
> After patch with a 4MB BAR:
> $ time /usr/bin/pcitest -b 1
> BAR1: OKAY
> real 0m 0.54s
Applied to misc, thank you!
[1/1] misc: pci_endpoint_test: Use memcpy_toio()/memcpy_fromio() for BAR tests
https://git.kernel.org/pci/pci/c/9ff0a8cdf12e
Krzysztof
