Re: [PATCH v4 -tip 3/3] AHCI: Support multiple MSIs

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



* Alexander Gordeev <agordeev@xxxxxxxxxx> wrote:

> Take advantage of multiple MSIs implementation on x86 - on systems with
> IRQ remapping AHCI ports not only get assigned separate MSI vectors -
> but also separate IRQs. As result, interrupts generated by different
> ports could be serviced on different CPUs rather than on a single one.
> 
> In cases when number of allocated MSIs is less than requested the Sharing
> Last MSI mode does not get used, no matter implemented in hardware or not.
> Instead, the driver assumes the advantage of multiple MSIs is negated and
> falls back to the single MSI mode as if MRSM bit was set (some Intel chips
> implement this strategy anyway - MRSM bit gets set even if the number of
> allocated MSIs exceeds the number of implemented ports).
> 
> Signed-off-by: Alexander Gordeev <agordeev@xxxxxxxxxx>
> ---
>  drivers/ata/ahci.c    |   93 +++++++++++++++++++++++++++++++++++++--
>  drivers/ata/ahci.h    |    6 +++
>  drivers/ata/libahci.c |  118 ++++++++++++++++++++++++++++++++++++++++++++++---
>  3 files changed, 207 insertions(+), 10 deletions(-)

Has Jeff acked this patch?

Thanks,

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-pci" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [DMA Engine]     [Linux Coverity]     [Linux USB]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Greybus]

  Powered by Linux