From: Matthew Rosato <mjrosato@linux.ibm.com>
To: cohuck@redhat.com, thuth@redhat.com
Cc: pmorel@linux.ibm.com, schnelle@linux.ibm.com, rth@twiddle.net,
david@redhat.com, pasic@linux.ibm.com, borntraeger@de.ibm.com,
mst@redhat.com, pbonzini@redhat.com, alex.williamson@redhat.com,
philmd@redhat.com, qemu-s390x@nongnu.org, qemu-devel@nongnu.org,
kvm@vger.kernel.org
Subject: [PATCH 05/13] vfio: Find DMA available capability
Date: Mon, 26 Oct 2020 11:34:33 -0400 [thread overview]
Message-ID: <1603726481-31824-6-git-send-email-mjrosato@linux.ibm.com> (raw)
In-Reply-To: <1603726481-31824-1-git-send-email-mjrosato@linux.ibm.com>
The underlying host may be limiting the number of outstanding DMA
requests for type 1 IOMMU. Add helper functions to check for the
DMA available capability and retrieve the current number of DMA
mappings allowed.
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
---
hw/vfio/common.c | 31 +++++++++++++++++++++++++++++++
include/hw/vfio/vfio-common.h | 2 ++
2 files changed, 33 insertions(+)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index e47a4d7..20914bf 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -849,6 +849,37 @@ vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
return vfio_get_cap((void *)info, info->cap_offset, id);
}
+static struct vfio_info_cap_header *
+vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
+{
+ if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
+ return NULL;
+ }
+
+ return vfio_get_cap((void *)info, info->cap_offset, id);
+}
+
+bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
+ unsigned int *avail)
+{
+ struct vfio_info_cap_header *hdr;
+ struct vfio_iommu_type1_info_dma_avail *cap;
+
+ /* If the capability cannot be found, assume no DMA limiting */
+ hdr = vfio_get_iommu_type1_info_cap(info,
+ VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL);
+ if (hdr == NULL) {
+ return false;
+ }
+
+ if (avail != NULL) {
+ cap = (void *) hdr;
+ *avail = cap->avail;
+ }
+
+ return true;
+}
+
static int vfio_setup_region_sparse_mmaps(VFIORegion *region,
struct vfio_region_info *info)
{
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index c78f3ff..661a380 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -178,6 +178,8 @@ VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp);
void vfio_put_group(VFIOGroup *group);
int vfio_get_device(VFIOGroup *group, const char *name,
VFIODevice *vbasedev, Error **errp);
+bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
+ unsigned int *avail);
extern const MemoryRegionOps vfio_region_ops;
typedef QLIST_HEAD(VFIOGroupList, VFIOGroup) VFIOGroupList;
--
1.8.3.1
next prev parent reply other threads:[~2020-10-26 15:35 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-26 15:34 [PATCH 00/13] s390x/pci: s390-pci updates for kernel 5.10-rc1 Matthew Rosato
2020-10-26 15:34 ` [PATCH 01/13] update-linux-headers: Add vfio_zdev.h Matthew Rosato
2020-10-26 15:34 ` [PATCH 02/13] linux-headers: update against 5.10-rc1 Matthew Rosato
2020-10-26 17:37 ` Alex Williamson
2020-10-26 17:40 ` Matthew Rosato
2020-10-26 15:34 ` [PATCH 03/13] s390x/pci: Move header files to include/hw/s390x Matthew Rosato
2020-10-26 15:34 ` [PATCH 04/13] vfio: Create shared routine for scanning info capabilities Matthew Rosato
2020-10-26 15:34 ` Matthew Rosato [this message]
2020-10-26 15:34 ` [PATCH 06/13] s390x/pci: Add routine to get the vfio dma available count Matthew Rosato
2020-10-26 15:34 ` [PATCH 07/13] s390x/pci: Honor DMA limits set by vfio Matthew Rosato
2020-10-26 15:34 ` [PATCH 08/13] s390x/pci: create a header dedicated to PCI CLP Matthew Rosato
2020-10-26 15:34 ` [PATCH 09/13] s390x/pci: use a PCI Group structure Matthew Rosato
2020-10-26 15:34 ` [PATCH 10/13] s390x/pci: clean up s390 PCI groups Matthew Rosato
2020-10-26 15:34 ` [PATCH 11/13] s390x/pci: use a PCI Function structure Matthew Rosato
2020-10-26 15:34 ` [PATCH 12/13] vfio: Add routine for finding VFIO_DEVICE_GET_INFO capabilities Matthew Rosato
2020-10-26 15:34 ` [PATCH 13/13] s390x/pci: get zPCI function info from host Matthew Rosato
2020-10-26 16:38 ` Cornelia Huck
2020-10-26 16:19 ` [PATCH 00/13] s390x/pci: s390-pci updates for kernel 5.10-rc1 Cornelia Huck
2020-10-26 16:38 ` Matthew Rosato
2020-10-26 16:44 ` Cornelia Huck
2020-10-26 16:41 ` Cornelia Huck
2020-10-26 16:53 ` Alex Williamson
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