From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Cooper Subject: Re: [Xen-devel] [PATCH v2 08/16] xen/hvm/params: Add a new delivery type for event-channel in HVM_PARAM_CALLBACK_IRQ Date: Mon, 18 Jan 2016 12:52:28 +0000 Message-ID: <569CE00C.5050406@citrix.com> References: <1452840929-19612-1-git-send-email-zhaoshenglong@huawei.com> <1452840929-19612-9-git-send-email-zhaoshenglong@huawei.com> <569CDDB7.9030103@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Stefano Stabellini Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, stefano.stabellini-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org, david.vrabel-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, catalin.marinas-5wv7dgnIgG8@public.gmane.org, will.deacon-5wv7dgnIgG8@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, xen-devel-GuqFBffKawuEi8DpZVb4nw@public.gmane.org, julien.grall-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org, shannon.zhao-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, peter.huangpeng-hv44wF8Li93QT0dZR+AlfA@public.gmane.org, zhaoshenglong-hv44wF8Li93QT0dZR+AlfA@public.gmane.org List-Id: devicetree@vger.kernel.org On 18/01/16 12:46, Stefano Stabellini wrote: > On Mon, 18 Jan 2016, Andrew Cooper wrote: >> On 18/01/16 12:38, Stefano Stabellini wrote: >>> On Fri, 15 Jan 2016, Shannon Zhao wrote: >>>> From: Shannon Zhao >>>> >>>> Add a new delivery type: >>>> val[63:56] == 3: val[15:8] is flag: val[7:0] is a PPI. >>>> To the flag, bit 0 stands the interrupt mode is edge(1) or level(0) and >>>> bit 1 stands the interrupt polarity is active low(1) or high(0). >>>> >>>> Signed-off-by: Shannon Zhao >>>> --- >>>> include/xen/interface/hvm/params.h | 5 +++++ >>>> 1 file changed, 5 insertions(+) >>>> >>>> diff --git a/include/xen/interface/hvm/params.h b/include/xen/interface/hvm/params.h >>>> index a6c7991..550688a 100644 >>>> --- a/include/xen/interface/hvm/params.h >>>> +++ b/include/xen/interface/hvm/params.h >>>> @@ -34,6 +34,11 @@ >>>> * Domain = val[47:32], Bus = val[31:16], >>>> * DevFn = val[15: 8], IntX = val[ 1: 0] >>>> * val[63:56] == 2: val[7:0] is a vector number. >>>> + * val[63:56] == 3: val[15:8] is flag of event-channel interrupt: >>>> + * bit 0: interrupt is edge(1) or level(0) triggered >>>> + * bit 1: interrupt is active low(1) or high(0) >>>> + * val[7:0] is PPI number used by event-channel. >>>> + * This is only used by ARM/ARM64. >>>> * If val == 0 then CPU0 event-channel notifications are not delivered. >>>> */ >>>> #define HVM_PARAM_CALLBACK_IRQ 0 >>> Andrew, I think that this patch is correct. Looking back at your >>> previous comment (http://marc.info/?l=devicetree&m=144804014214262&w=2), >>> is it possible that you were confused by enum callback_via_type, which >>> is internal to Xen and offset'ed by 1 compared to the described values >>> in xen/include/public/hvm/params.h? >>> >>> If not, and indeed somebody introduced one more field but failed to >>> document it, then I suggest she sends a patch to fix the issue as soon >>> as possible. >> I was indeed confused - the ABI is utterly mad. > All right. In that case, Shannon, you can add my > > Reviewed-by: Stefano Stabellini > > >> However, this change does need rebasing over c/s ca5c54b, which was the >> result of the original discussion. > c/s ca5c54b is for Xen, while this is a Linux patch (Linux has its own > set of Xen headers). All ABI changes need to happen in the Xen public headers first. This patch cannot be accepted yet. ~Andrew -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html