Date: Sat, 20 Mar 2021 07:46:01 GMT From: Ka Ho Ng <khng@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: faf9a4e9142a - main - virtio_pci_legacy: Use the table BAR and PBA BAR from MSI-X cap Message-ID: <202103200746.12K7k16W092373@gitrepo.freebsd.org>
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The branch main has been updated by khng: URL: https://cgit.FreeBSD.org/src/commit/?id=faf9a4e9142a02c289ee543a6091bd4b925c6a63 commit faf9a4e9142a02c289ee543a6091bd4b925c6a63 Author: Ka Ho Ng <khng@FreeBSD.org> AuthorDate: 2021-03-20 07:40:52 +0000 Commit: Ka Ho Ng <khng@FreeBSD.org> CommitDate: 2021-03-20 07:45:34 +0000 virtio_pci_legacy: Use the table BAR and PBA BAR from MSI-X cap The MSI-X resource shouldn't be assumed to be always on BAR1. The Virtio v1.1 Spec did not specify that MSI-X table and PBA BAR has to be BAR1 either. Reported by: Yuan Rui <number201724@me.com> MFC after: 2 weeks Reviewed by: bryanv, jhb Approved by: philip (mentor) Differential Revision: https://reviews.freebsd.org/D28817 --- sys/dev/virtio/pci/virtio_pci_legacy.c | 74 +++++++++++++++++++++++++++------- 1 file changed, 60 insertions(+), 14 deletions(-) diff --git a/sys/dev/virtio/pci/virtio_pci_legacy.c b/sys/dev/virtio/pci/virtio_pci_legacy.c index 22e369097e2e..d74983099110 100644 --- a/sys/dev/virtio/pci/virtio_pci_legacy.c +++ b/sys/dev/virtio/pci/virtio_pci_legacy.c @@ -60,7 +60,8 @@ struct vtpci_legacy_softc { device_t vtpci_dev; struct vtpci_common vtpci_common; struct resource *vtpci_res; - struct resource *vtpci_msix_res; + struct resource *vtpci_msix_table_res; + struct resource *vtpci_msix_pba_res; }; static int vtpci_legacy_probe(device_t); @@ -97,6 +98,8 @@ static void vtpci_legacy_notify_vq(device_t, uint16_t, bus_size_t); static void vtpci_legacy_read_dev_config(device_t, bus_size_t, void *, int); static void vtpci_legacy_write_dev_config(device_t, bus_size_t, void *, int); +static bool vtpci_legacy_setup_msix(struct vtpci_legacy_softc *sc); +static void vtpci_legacy_teardown_msix(struct vtpci_legacy_softc *sc); static int vtpci_legacy_alloc_resources(struct vtpci_legacy_softc *); static void vtpci_legacy_free_resources(struct vtpci_legacy_softc *); @@ -232,6 +235,13 @@ vtpci_legacy_attach(device_t dev) return (error); } + if (vtpci_is_msix_available(&sc->vtpci_common) && + !vtpci_legacy_setup_msix(sc)) { + device_printf(dev, "cannot setup MSI-x resources\n"); + error = ENXIO; + goto fail; + } + vtpci_legacy_reset(sc); /* Tell the host we've noticed this device. */ @@ -265,6 +275,7 @@ vtpci_legacy_detach(device_t dev) return (error); vtpci_legacy_reset(sc); + vtpci_legacy_teardown_msix(sc); vtpci_legacy_free_resources(sc); return (0); @@ -539,6 +550,54 @@ vtpci_legacy_write_dev_config(device_t dev, bus_size_t offset, } } +static bool +vtpci_legacy_setup_msix(struct vtpci_legacy_softc *sc) +{ + device_t dev; + int rid, table_rid; + + dev = sc->vtpci_dev; + + rid = table_rid = pci_msix_table_bar(dev); + if (rid != PCIR_BAR(0)) { + sc->vtpci_msix_table_res = bus_alloc_resource_any( + dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); + if (sc->vtpci_msix_table_res == NULL) + return (false); + } + + rid = pci_msix_pba_bar(dev); + if (rid != table_rid && rid != PCIR_BAR(0)) { + sc->vtpci_msix_pba_res = bus_alloc_resource_any( + dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); + if (sc->vtpci_msix_pba_res == NULL) + return (false); + } + + return (true); +} + +static void +vtpci_legacy_teardown_msix(struct vtpci_legacy_softc *sc) +{ + device_t dev; + + dev = sc->vtpci_dev; + + if (sc->vtpci_msix_pba_res != NULL) { + bus_release_resource(dev, SYS_RES_MEMORY, + rman_get_rid(sc->vtpci_msix_pba_res), + sc->vtpci_msix_pba_res); + sc->vtpci_msix_pba_res = NULL; + } + if (sc->vtpci_msix_table_res != NULL) { + bus_release_resource(dev, SYS_RES_MEMORY, + rman_get_rid(sc->vtpci_msix_table_res), + sc->vtpci_msix_table_res); + sc->vtpci_msix_table_res = NULL; + } +} + static int vtpci_legacy_alloc_resources(struct vtpci_legacy_softc *sc) { @@ -552,13 +611,6 @@ vtpci_legacy_alloc_resources(struct vtpci_legacy_softc *sc) &rid, RF_ACTIVE)) == NULL) return (ENXIO); - if (vtpci_is_msix_available(&sc->vtpci_common)) { - rid = PCIR_BAR(1); - if ((sc->vtpci_msix_res = bus_alloc_resource_any(dev, - SYS_RES_MEMORY, &rid, RF_ACTIVE)) == NULL) - return (ENXIO); - } - return (0); } @@ -569,12 +621,6 @@ vtpci_legacy_free_resources(struct vtpci_legacy_softc *sc) dev = sc->vtpci_dev; - if (sc->vtpci_msix_res != NULL) { - bus_release_resource(dev, SYS_RES_MEMORY, PCIR_BAR(1), - sc->vtpci_msix_res); - sc->vtpci_msix_res = NULL; - } - if (sc->vtpci_res != NULL) { bus_release_resource(dev, SYS_RES_IOPORT, PCIR_BAR(0), sc->vtpci_res);
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