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From 3927f54a56e29003b84e0e3726d3a0170681128b Mon Sep 17 00:00:00 2001
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From: Cornelia Huck <cohuck@redhat.com>
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Date: Tue, 19 Jan 2021 12:50:44 -0500
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Subject: [PATCH 5/7] s390x/pci: Add routine to get the vfio dma available
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count
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RH-Author: Cornelia Huck <cohuck@redhat.com>
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Message-id: <20210119125046.472811-6-cohuck@redhat.com>
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Patchwork-id: 100679
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O-Subject: [RHEL-8.4.0 qemu-kvm PATCH 5/7] s390x/pci: Add routine to get the vfio dma available count
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Bugzilla: 1905391
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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RH-Acked-by: Auger Eric <eric.auger@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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From: Matthew Rosato <mjrosato@linux.ibm.com>
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Create new files for separating out vfio-specific work for s390
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pci. Add the first such routine, which issues VFIO_IOMMU_GET_INFO
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ioctl to collect the current dma available count.
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Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
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Reviewed-by: Cornelia Huck <cohuck@redhat.com>
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[aw: Fix non-Linux build with CONFIG_LINUX]
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Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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(cherry picked from commit cd7498d07fbb20fa04790ff7ee168a8a8d01cb30)
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Signed-off-by: Cornelia Huck <cohuck@redhat.com>
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Conflicts:
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hw/s390x/meson.build
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--> added the file in hw/s390x/Makefile.objs instead,
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since we do not use Meson yet
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hw/s390x/s390-pci-vfio.c
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--> NULL-initialize "info" to avoid a downstream-only
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compiler warning
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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hw/s390x/Makefile.objs | 1 +
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hw/s390x/s390-pci-vfio.c | 54 ++++++++++++++++++++++++++++++++
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include/hw/s390x/s390-pci-vfio.h | 24 ++++++++++++++
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3 files changed, 79 insertions(+)
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create mode 100644 hw/s390x/s390-pci-vfio.c
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create mode 100644 include/hw/s390x/s390-pci-vfio.h
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diff --git a/hw/s390x/Makefile.objs b/hw/s390x/Makefile.objs
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index c4086ec3171..43756c9437d 100644
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--- a/hw/s390x/Makefile.objs
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+++ b/hw/s390x/Makefile.objs
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@@ -7,6 +7,7 @@ obj-y += ipl.o
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obj-y += css.o
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obj-$(CONFIG_S390_CCW_VIRTIO) += s390-virtio-ccw.o
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obj-$(CONFIG_TERMINAL3270) += 3270-ccw.o
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+obj-$(CONFIG_LINUX) += s390-pci-vfio.o
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ifeq ($(CONFIG_VIRTIO_CCW),y)
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obj-y += virtio-ccw.o
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obj-$(CONFIG_VIRTIO_SERIAL) += virtio-ccw-serial.o
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diff --git a/hw/s390x/s390-pci-vfio.c b/hw/s390x/s390-pci-vfio.c
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new file mode 100644
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index 00000000000..0eb22ffec4c
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--- /dev/null
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+++ b/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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+
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+#include <sys/ioctl.h>
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+
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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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+/*
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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 = NULL;
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+ uint32_t argsz;
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+
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+ assert(avail);
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+
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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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+ /*
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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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+
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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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+
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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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+
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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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+
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diff --git a/include/hw/s390x/s390-pci-vfio.h b/include/hw/s390x/s390-pci-vfio.h
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new file mode 100644
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index 00000000000..1727292e9b5
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--- /dev/null
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+++ b/include/hw/s390x/s390-pci-vfio.h
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@@ -0,0 +1,24 @@
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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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+
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+#ifndef HW_S390_PCI_VFIO_H
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+#define HW_S390_PCI_VFIO_H
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+
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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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+
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+#endif
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--
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2.27.0
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