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[PULL v2 22/32] vfio: Find DMA available capability
From: |
Alex Williamson |
Subject: |
[PULL v2 22/32] vfio: Find DMA available capability |
Date: |
Wed, 28 Oct 2020 10:42:45 -0600 |
User-agent: |
StGit/0.21-dirty |
From: Matthew Rosato <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>
[aw: vfio_get_info_dma_avail moved inside CONFIG_LINUX]
Signed-off-by: Alex Williamson <alex.williamson@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 d135a564317a..b9780ba6e9e1 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -1149,6 +1149,37 @@ 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 24e299d97425..1d14946a9d66 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -214,6 +214,8 @@ int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t
type,
bool vfio_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_type);
struct vfio_info_cap_header *
vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id);
+bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
+ unsigned int *avail);
#endif
extern const MemoryListener vfio_prereg_listener;
- [PULL v2 12/32] vfio: Add function to start and stop dirty pages tracking, (continued)
- [PULL v2 12/32] vfio: Add function to start and stop dirty pages tracking, Alex Williamson, 2020/10/28
- [PULL v2 13/32] vfio: Add vfio_listener_log_sync to mark dirty pages, Alex Williamson, 2020/10/28
- [PULL v2 14/32] vfio: Dirty page tracking when vIOMMU is enabled, Alex Williamson, 2020/10/28
- [PULL v2 15/32] vfio: Add ioctl to get dirty pages bitmap during dma unmap, Alex Williamson, 2020/10/28
- [PULL v2 16/32] vfio: Make vfio-pci device migration capable, Alex Williamson, 2020/10/28
- [PULL v2 17/32] qapi: Add VFIO devices migration stats in Migration stats, Alex Williamson, 2020/10/28
- [PULL v2 18/32] update-linux-headers: Add vfio_zdev.h, Alex Williamson, 2020/10/28
- [PULL v2 19/32] linux-headers: update against 5.10-rc1, Alex Williamson, 2020/10/28
- [PULL v2 20/32] s390x/pci: Move header files to include/hw/s390x, Alex Williamson, 2020/10/28
- [PULL v2 21/32] vfio: Create shared routine for scanning info capabilities, Alex Williamson, 2020/10/28
- [PULL v2 22/32] vfio: Find DMA available capability,
Alex Williamson <=
- [PULL v2 23/32] s390x/pci: Add routine to get the vfio dma available count, Alex Williamson, 2020/10/28
- [PULL v2 24/32] s390x/pci: Honor DMA limits set by vfio, Alex Williamson, 2020/10/28
- [PULL v2 25/32] s390x/pci: create a header dedicated to PCI CLP, Alex Williamson, 2020/10/28
- [PULL v2 26/32] s390x/pci: use a PCI Group structure, Alex Williamson, 2020/10/28
- [PULL v2 27/32] s390x/pci: clean up s390 PCI groups, Alex Williamson, 2020/10/28
- [PULL v2 28/32] s390x/pci: use a PCI Function structure, Alex Williamson, 2020/10/28
- [PULL v2 29/32] vfio: Add routine for finding VFIO_DEVICE_GET_INFO capabilities, Alex Williamson, 2020/10/28
- [PULL v2 30/32] s390x/pci: get zPCI function info from host, Alex Williamson, 2020/10/28
- [PULL v2 31/32] hw/vfio: Use lock guard macros, Alex Williamson, 2020/10/28
- [PULL v2 32/32] vfio: fix incorrect print type, Alex Williamson, 2020/10/28