s390x/pci: Add routine to get the vfio dma available count
Create new files for separating out vfio-specific work for s390 pci. Add the first such routine, which issues VFIO_IOMMU_GET_INFO ioctl to collect the current dma available count. Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> [aw: Fix non-Linux build with CONFIG_LINUX] Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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@ -27,6 +27,7 @@ s390x_ss.add(when: 'CONFIG_KVM', if_true: files(
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))
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))
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s390x_ss.add(when: 'CONFIG_S390_CCW_VIRTIO', if_true: files('s390-virtio-ccw.c'))
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s390x_ss.add(when: 'CONFIG_S390_CCW_VIRTIO', if_true: files('s390-virtio-ccw.c'))
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s390x_ss.add(when: 'CONFIG_TERMINAL3270', if_true: files('3270-ccw.c'))
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s390x_ss.add(when: 'CONFIG_TERMINAL3270', if_true: files('3270-ccw.c'))
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s390x_ss.add(when: 'CONFIG_LINUX', if_true: files('s390-pci-vfio.c'))
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virtio_ss = ss.source_set()
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virtio_ss = ss.source_set()
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virtio_ss.add(files('virtio-ccw.c'))
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virtio_ss.add(files('virtio-ccw.c'))
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54
hw/s390x/s390-pci-vfio.c
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54
hw/s390x/s390-pci-vfio.c
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@ -0,0 +1,54 @@
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/*
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* s390 vfio-pci interfaces
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*
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* Copyright 2020 IBM Corp.
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* Author(s): Matthew Rosato <mjrosato@linux.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#include <sys/ioctl.h>
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#include "qemu/osdep.h"
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#include "hw/s390x/s390-pci-vfio.h"
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#include "hw/vfio/vfio-common.h"
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/*
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* Get the current DMA available count from vfio. Returns true if vfio is
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* limiting DMA requests, false otherwise. The current available count read
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* from vfio is returned in avail.
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*/
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bool s390_pci_update_dma_avail(int fd, unsigned int *avail)
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{
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g_autofree struct vfio_iommu_type1_info *info;
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uint32_t argsz;
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assert(avail);
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argsz = sizeof(struct vfio_iommu_type1_info);
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info = g_malloc0(argsz);
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/*
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* If the specified argsz is not large enough to contain all capabilities
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* it will be updated upon return from the ioctl. Retry until we have
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* a big enough buffer to hold the entire capability chain.
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*/
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retry:
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info->argsz = argsz;
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if (ioctl(fd, VFIO_IOMMU_GET_INFO, info)) {
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return false;
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}
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if (info->argsz > argsz) {
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argsz = info->argsz;
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info = g_realloc(info, argsz);
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goto retry;
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}
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/* If the capability exists, update with the current value */
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return vfio_get_info_dma_avail(info, avail);
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}
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24
include/hw/s390x/s390-pci-vfio.h
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24
include/hw/s390x/s390-pci-vfio.h
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/*
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* s390 vfio-pci interfaces
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*
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* Copyright 2020 IBM Corp.
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* Author(s): Matthew Rosato <mjrosato@linux.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#ifndef HW_S390_PCI_VFIO_H
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#define HW_S390_PCI_VFIO_H
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#ifdef CONFIG_LINUX
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bool s390_pci_update_dma_avail(int fd, unsigned int *avail);
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#else
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static inline bool s390_pci_update_dma_avail(int fd, unsigned int *avail)
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{
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return false;
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}
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#endif
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#endif
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