From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:61966 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729548AbhASUDY (ORCPT ); Tue, 19 Jan 2021 15:03:24 -0500 From: Matthew Rosato Subject: [PATCH 2/4] vfio-pci/zdev: Pass the relaxed alignment flag Date: Tue, 19 Jan 2021 15:02:28 -0500 Message-Id: <1611086550-32765-3-git-send-email-mjrosato@linux.ibm.com> In-Reply-To: <1611086550-32765-1-git-send-email-mjrosato@linux.ibm.com> References: <1611086550-32765-1-git-send-email-mjrosato@linux.ibm.com> List-ID: To: alex.williamson@redhat.com, cohuck@redhat.com, schnelle@linux.ibm.com Cc: pmorel@linux.ibm.com, borntraeger@de.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, gerald.schaefer@linux.ibm.com, linux-s390@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Use an additional bit of the VFIO_DEVICE_INFO_CAP_ZPCI_GROUP flags field to pass whether or not the associated device supports relaxed length and alignment for some I/O operations. Signed-off-by: Matthew Rosato Acked-by: Niklas Schnelle Reviewed-by: Pierre Morel --- drivers/vfio/pci/vfio_pci_zdev.c | 2 ++ include/uapi/linux/vfio_zdev.h | 1 + 2 files changed, 3 insertions(+) diff --git a/drivers/vfio/pci/vfio_pci_zdev.c b/drivers/vfio/pci/vfio_pci_zdev.c index 2296856..57e19ff 100644 --- a/drivers/vfio/pci/vfio_pci_zdev.c +++ b/drivers/vfio/pci/vfio_pci_zdev.c @@ -60,6 +60,8 @@ static int zpci_group_cap(struct zpci_dev *zdev, struct vfio_pci_device *vdev, .version = zdev->version }; + if (zdev->relaxed_align) + cap.flags |= VFIO_DEVICE_INFO_ZPCI_FLAG_RELAXED; return vfio_info_add_capability(caps, &cap.header, sizeof(cap)); } diff --git a/include/uapi/linux/vfio_zdev.h b/include/uapi/linux/vfio_zdev.h index b430939..b0b6596 100644 --- a/include/uapi/linux/vfio_zdev.h +++ b/include/uapi/linux/vfio_zdev.h @@ -43,6 +43,7 @@ struct vfio_device_info_cap_zpci_group { __u64 msi_addr; /* MSI address */ __u64 flags; #define VFIO_DEVICE_INFO_ZPCI_FLAG_REFRESH 1 /* Program-specified TLB refresh */ +#define VFIO_DEVICE_INFO_ZPCI_FLAG_RELAXED 2 /* Relaxed Length and Alignment */ __u16 mui; /* Measurement Block Update Interval */ __u16 noi; /* Maximum number of MSIs */ __u16 maxstbl; /* Maximum Store Block Length */ -- 1.8.3.1