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From b6a8c4f1ada2c7d31bdd2438163f11026a0a0711 Mon Sep 17 00:00:00 2001
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From: Alex Williamson <alex.williamson@redhat.com>
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Date: Fri, 17 Jul 2015 20:46:43 +0200
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Subject: [PATCH 2/5] vfio/pci : Add pba_offset PCI quirk for Chelsio T5
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devices
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Message-id: <20150717203953.606.815.stgit@gimli.home>
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Patchwork-id: 67057
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O-Subject: [RHEL7.2 qemu-kvm PATCH] vfio/pci : Add pba_offset PCI quirk for Chelsio T5 devices
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Bugzilla: 1244347
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Bandan Das <bsd@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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From: Gabriel Laupre <glaupre@chelsio.com>
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Upstream: 43302969966bc3a95470bfc300289a83068ef5d9
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Fix pba_offset initialization value for Chelsio T5 Virtual Function
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device. The T5 hardware has a bug in it where it reports a Pending Interrupt
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Bit Array Offset of 0x8000 for its SR-IOV Virtual Functions instead
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of the 0x1000 that the hardware actually uses internally. As the hardware
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doesn't return the correct pba_offset value, add a quirk to instead
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return a hardcoded value of 0x1000 when a Chelsio T5 VF device is
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detected.
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This bug has been fixed in the Chelsio's next chip series T6 but there are
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no plans to respin the T5 ASIC for this bug. It is just documented in the
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T5 Errata and left it at that.
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Signed-off-by: Gabriel Laupre <glaupre@chelsio.com>
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Reviewed-by: Bandan Das <bsd@redhat.com>
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Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/misc/vfio.c | 27 +++++++++++++++++++++++++++
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include/hw/pci/pci_ids.h | 2 ++
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2 files changed, 29 insertions(+)
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diff --git a/hw/misc/vfio.c b/hw/misc/vfio.c
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index 118489c..36b9832 100644
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--- a/hw/misc/vfio.c
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+++ b/hw/misc/vfio.c
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@@ -2466,6 +2466,33 @@ static int vfio_early_setup_msix(VFIODevice *vdev)
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vdev->host.function, pos, vdev->msix->table_bar,
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vdev->msix->table_offset, vdev->msix->entries);
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+ /*
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+ * Test the size of the pba_offset variable and catch if it extends outside
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+ * of the specified BAR. If it is the case, we need to apply a hardware
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+ * specific quirk if the device is known or we have a broken configuration.
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+ */
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+ if (vdev->msix->pba_offset >=
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+ vdev->bars[vdev->msix->pba_bar].size) {
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+
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+ PCIDevice *pdev = &vdev->pdev;
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+ uint16_t vendor = pci_get_word(pdev->config + PCI_VENDOR_ID);
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+ uint16_t device = pci_get_word(pdev->config + PCI_DEVICE_ID);
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+
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+ /*
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+ * Chelsio T5 Virtual Function devices are encoded as 0x58xx for T5
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+ * adapters. The T5 hardware returns an incorrect value of 0x8000 for
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+ * the VF PBA offset while the BAR itself is only 8k. The correct value
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+ * is 0x1000, so we hard code that here.
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+ */
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+ if (vendor == PCI_VENDOR_ID_CHELSIO && (device & 0xff00) == 0x5800) {
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+ vdev->msix->pba_offset = 0x1000;
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+ } else {
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+ error_report("vfio: Hardware reports invalid configuration, "
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+ "MSIX PBA outside of specified BAR");
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+ return -EINVAL;
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+ }
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+ }
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+
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return 0;
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}
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diff --git a/include/hw/pci/pci_ids.h b/include/hw/pci/pci_ids.h
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index d8dc2f1..3792255 100644
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--- a/include/hw/pci/pci_ids.h
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+++ b/include/hw/pci/pci_ids.h
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@@ -102,6 +102,8 @@
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#define PCI_VENDOR_ID_ENSONIQ 0x1274
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#define PCI_DEVICE_ID_ENSONIQ_ES1370 0x5000
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+#define PCI_VENDOR_ID_CHELSIO 0x1425
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+
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#define PCI_VENDOR_ID_FREESCALE 0x1957
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#define PCI_DEVICE_ID_MPC8533E 0x0030
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--
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1.8.3.1
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