Re: [PATCH 2/3] pci: Let pci_dma_read() propagate MemTxResult

[Li Qiang <liq3ea@gmail.com>]

Philippe Mathieu-Daudé <philmd@redhat.com> 于2020年9月5日周六 上午12:27写道：
>
> pci_dma_rw() returns a MemTxResult type.
> Do not discard it, return it to the caller.
>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>

Reviewed-by: Li Qiang <liq3ea@gmail.com>

> ---
>  include/hw/pci/pci.h | 16 ++++++++++++++--
>  1 file changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
> index a85b0bc3c44..bb57525dffd 100644
> --- a/include/hw/pci/pci.h
> +++ b/include/hw/pci/pci.h
> @@ -806,8 +806,20 @@ static inline MemTxResult pci_dma_rw(PCIDevice *dev, dma_addr_t addr,
>                           dir, MEMTXATTRS_UNSPECIFIED);
>  }
>
> -static inline int pci_dma_read(PCIDevice *dev, dma_addr_t addr,
> -                               void *buf, dma_addr_t len)
> +/**
> + * pci_dma_read: Read from an address space from PCI device.
> + *
> + * Return a MemTxResult indicating whether the operation succeeded
> + * or failed (eg unassigned memory, device rejected the transaction,
> + * IOMMU fault).  Called within RCU critical section.
> + *
> + * @dev: #PCIDevice doing the memory access
> + * @addr: address within the #PCIDevice address space
> + * @buf: buffer with the data transferred
> + * @len: length of the data transferred
> + */
> +static inline MemTxResult pci_dma_read(PCIDevice *dev, dma_addr_t addr,
> +                                       void *buf, dma_addr_t len)
>  {
>      return pci_dma_rw(dev, addr, buf, len, DMA_DIRECTION_TO_DEVICE);
>  }
> --
> 2.26.2
>
>