Re: [PATCH v7 06/48] nvme: refactor nvme_addr_read

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 4/15/20 7:50 AM, Klaus Jensen wrote:
> From: Klaus Jensen <k.jensen@samsung.com>
> 
> Pull the controller memory buffer check to its own function. The check
> will be used on its own in later patches.
> 
> Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
> Acked-by: Keith Busch <kbusch@kernel.org>
> ---
>   hw/block/nvme.c | 16 ++++++++++++----
>   1 file changed, 12 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/block/nvme.c b/hw/block/nvme.c
> index 622103c42d0a..02d3dde90842 100644
> --- a/hw/block/nvme.c
> +++ b/hw/block/nvme.c
> @@ -52,14 +52,22 @@
>   
>   static void nvme_process_sq(void *opaque);
>   
> +static inline bool nvme_addr_is_cmb(NvmeCtrl *n, hwaddr addr)

'inline' not really necessary here.

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

> +{
> +    hwaddr low = n->ctrl_mem.addr;
> +    hwaddr hi  = n->ctrl_mem.addr + int128_get64(n->ctrl_mem.size);
> +
> +    return addr >= low && addr < hi;
> +}
> +
>   static void nvme_addr_read(NvmeCtrl *n, hwaddr addr, void *buf, int size)
>   {
> -    if (n->cmbsz && addr >= n->ctrl_mem.addr &&
> -                addr < (n->ctrl_mem.addr + int128_get64(n->ctrl_mem.size))) {
> +    if (n->cmbsz && nvme_addr_is_cmb(n, addr)) {
>           memcpy(buf, (void *)&n->cmbuf[addr - n->ctrl_mem.addr], size);
> -    } else {
> -        pci_dma_read(&n->parent_obj, addr, buf, size);
> +        return;
>       }
> +
> +    pci_dma_read(&n->parent_obj, addr, buf, size);
>   }
>   
>   static int nvme_check_sqid(NvmeCtrl *n, uint16_t sqid)
>