From: Alex Williamson <alex.williamson@redhat.com>
To: qemu-devel@nongnu.org
Cc: Cornelia Huck <cohuck@redhat.com>,
Matthew Rosato <mjrosato@linux.ibm.com>
Subject: [PULL 23/32] s390x/pci: Add routine to get the vfio dma available count
Date: Mon, 26 Oct 2020 13:35:45 -0600 [thread overview]
Message-ID: <160374094492.22414.1057050065406633805.stgit@gimli.home> (raw)
In-Reply-To: <160374054442.22414.10832953989449611268.stgit@gimli.home>
From: Matthew Rosato <mjrosato@linux.ibm.com>
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>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
hw/s390x/meson.build | 1 +
hw/s390x/s390-pci-vfio.c | 54 ++++++++++++++++++++++++++++++++++++++
include/hw/s390x/s390-pci-vfio.h | 17 ++++++++++++
3 files changed, 72 insertions(+)
create mode 100644 hw/s390x/s390-pci-vfio.c
create mode 100644 include/hw/s390x/s390-pci-vfio.h
diff --git a/hw/s390x/meson.build b/hw/s390x/meson.build
index 948ceae7a7b3..3ee4594760ac 100644
--- a/hw/s390x/meson.build
+++ b/hw/s390x/meson.build
@@ -10,6 +10,7 @@ s390x_ss.add(files(
's390-ccw.c',
's390-pci-bus.c',
's390-pci-inst.c',
+ 's390-pci-vfio.c',
's390-skeys.c',
's390-stattrib.c',
's390-virtio-hcall.c',
diff --git a/hw/s390x/s390-pci-vfio.c b/hw/s390x/s390-pci-vfio.c
new file mode 100644
index 000000000000..cb3f4d98adf8
--- /dev/null
+++ b/hw/s390x/s390-pci-vfio.c
@@ -0,0 +1,54 @@
+/*
+ * s390 vfio-pci interfaces
+ *
+ * Copyright 2020 IBM Corp.
+ * Author(s): Matthew Rosato <mjrosato@linux.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at
+ * your option) any later version. See the COPYING file in the top-level
+ * directory.
+ */
+
+#include <sys/ioctl.h>
+
+#include "qemu/osdep.h"
+#include "hw/s390x/s390-pci-vfio.h"
+#include "hw/vfio/vfio-common.h"
+
+/*
+ * Get the current DMA available count from vfio. Returns true if vfio is
+ * limiting DMA requests, false otherwise. The current available count read
+ * from vfio is returned in avail.
+ */
+bool s390_pci_update_dma_avail(int fd, unsigned int *avail)
+{
+ g_autofree struct vfio_iommu_type1_info *info;
+ uint32_t argsz;
+
+ assert(avail);
+
+ argsz = sizeof(struct vfio_iommu_type1_info);
+ info = g_malloc0(argsz);
+
+ /*
+ * If the specified argsz is not large enough to contain all capabilities
+ * it will be updated upon return from the ioctl. Retry until we have
+ * a big enough buffer to hold the entire capability chain.
+ */
+retry:
+ info->argsz = argsz;
+
+ if (ioctl(fd, VFIO_IOMMU_GET_INFO, info)) {
+ return false;
+ }
+
+ if (info->argsz > argsz) {
+ argsz = info->argsz;
+ info = g_realloc(info, argsz);
+ goto retry;
+ }
+
+ /* If the capability exists, update with the current value */
+ return vfio_get_info_dma_avail(info, avail);
+}
+
diff --git a/include/hw/s390x/s390-pci-vfio.h b/include/hw/s390x/s390-pci-vfio.h
new file mode 100644
index 000000000000..2a5a261cc9b1
--- /dev/null
+++ b/include/hw/s390x/s390-pci-vfio.h
@@ -0,0 +1,17 @@
+/*
+ * s390 vfio-pci interfaces
+ *
+ * Copyright 2020 IBM Corp.
+ * Author(s): Matthew Rosato <mjrosato@linux.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at
+ * your option) any later version. See the COPYING file in the top-level
+ * directory.
+ */
+
+#ifndef HW_S390_PCI_VFIO_H
+#define HW_S390_PCI_VFIO_H
+
+bool s390_pci_update_dma_avail(int fd, unsigned int *avail);
+
+#endif
next prev parent reply other threads:[~2020-10-26 20:08 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-26 19:32 [PULL 00/32] VFIO updates 2020-10-26 (for QEMU 5.2 soft-freeze) Alex Williamson
2020-10-26 19:32 ` [PULL 01/32] vfio: Add function to unmap VFIO region Alex Williamson
2020-10-26 19:32 ` [PULL 02/32] vfio: Add vfio_get_object callback to VFIODeviceOps Alex Williamson
2020-10-26 19:32 ` [PULL 03/32] vfio: Add save and load functions for VFIO PCI devices Alex Williamson
2020-10-26 19:32 ` [PULL 04/32] vfio: Add migration region initialization and finalize function Alex Williamson
2020-10-26 19:33 ` [PULL 05/32] vfio: Add VM state change handler to know state of VM Alex Williamson
2020-10-26 19:33 ` [PULL 06/32] vfio: Add migration state change notifier Alex Williamson
2020-10-26 19:33 ` [PULL 07/32] vfio: Register SaveVMHandlers for VFIO device Alex Williamson
2020-10-26 19:33 ` [PULL 08/32] vfio: Add save state functions to SaveVMHandlers Alex Williamson
2020-10-26 19:33 ` [PULL 09/32] vfio: Add load " Alex Williamson
2020-10-26 19:33 ` [PULL 10/32] memory: Set DIRTY_MEMORY_MIGRATION when IOMMU is enabled Alex Williamson
2020-10-26 19:34 ` [PULL 11/32] vfio: Get migration capability flags for container Alex Williamson
2020-10-26 19:34 ` [PULL 12/32] vfio: Add function to start and stop dirty pages tracking Alex Williamson
2020-10-26 19:34 ` [PULL 13/32] vfio: Add vfio_listener_log_sync to mark dirty pages Alex Williamson
2020-10-26 19:34 ` [PULL 14/32] vfio: Dirty page tracking when vIOMMU is enabled Alex Williamson
2020-10-26 19:34 ` [PULL 15/32] vfio: Add ioctl to get dirty pages bitmap during dma unmap Alex Williamson
2020-10-26 19:34 ` [PULL 16/32] vfio: Make vfio-pci device migration capable Alex Williamson
2020-10-26 19:34 ` [PULL 17/32] qapi: Add VFIO devices migration stats in Migration stats Alex Williamson
2020-10-26 19:35 ` [PULL 18/32] update-linux-headers: Add vfio_zdev.h Alex Williamson
2020-10-26 19:35 ` [PULL 19/32] linux-headers: update against 5.10-rc1 Alex Williamson
2020-10-26 19:35 ` [PULL 20/32] s390x/pci: Move header files to include/hw/s390x Alex Williamson
2020-10-26 19:35 ` [PULL 21/32] vfio: Create shared routine for scanning info capabilities Alex Williamson
2020-10-26 19:35 ` [PULL 22/32] vfio: Find DMA available capability Alex Williamson
2020-10-26 19:35 ` Alex Williamson [this message]
2020-10-26 19:35 ` [PULL 24/32] s390x/pci: Honor DMA limits set by vfio Alex Williamson
2020-10-26 19:35 ` [PULL 25/32] s390x/pci: create a header dedicated to PCI CLP Alex Williamson
2020-10-26 19:36 ` [PULL 26/32] s390x/pci: use a PCI Group structure Alex Williamson
2020-10-26 19:36 ` [PULL 27/32] s390x/pci: clean up s390 PCI groups Alex Williamson
2020-10-26 19:36 ` [PULL 28/32] s390x/pci: use a PCI Function structure Alex Williamson
2020-10-26 19:36 ` [PULL 29/32] vfio: Add routine for finding VFIO_DEVICE_GET_INFO capabilities Alex Williamson
2020-10-26 19:36 ` [PULL 30/32] s390x/pci: get zPCI function info from host Alex Williamson
2020-10-26 19:36 ` [PULL 31/32] hw/vfio: Use lock guard macros Alex Williamson
2020-10-26 19:36 ` [PULL 32/32] vfio: fix incorrect print type Alex Williamson
2020-10-27 23:42 ` [PULL 00/32] VFIO updates 2020-10-26 (for QEMU 5.2 soft-freeze) Peter Maydell
2020-10-28 2:00 ` Alex Williamson
2020-10-28 9:18 ` Dr. David Alan Gilbert
2020-10-28 15:23 ` Miklos Szeredi
2020-10-28 9:21 ` Max Reitz
2020-10-28 8:11 ` Cornelia Huck
2020-10-28 9:28 ` Max Reitz
2020-10-28 9:41 ` Max Reitz
2020-10-28 10:12 ` Cornelia Huck
2020-10-28 15:07 ` Peter Maydell
2020-10-28 15:20 ` Matthew Rosato
2020-10-28 15:41 ` Alex Williamson
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=160374094492.22414.1057050065406633805.stgit@gimli.home \
--to=alex.williamson@redhat.com \
--cc=cohuck@redhat.com \
--cc=mjrosato@linux.ibm.com \
--cc=qemu-devel@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).