| Message ID | 20201026105504.4023620-17-philmd@redhat.com |
|---|---|
| State | New |
| Headers | show |
| Series | util/vfio-helpers: Allow using multiple MSIX IRQs | expand |
Hi Philippe, On 10/26/20 11:55 AM, Philippe Mathieu-Daudé wrote: > qemu_vfio_pci_init_irq() allows us to initialize any type of IRQ, > but only one. Introduce qemu_vfio_pci_msix_init_irqs() which is > specific to MSIX IRQ type, and allow us to use multiple IRQs > (thus passing multiple eventfd notifiers). > All eventfd notifiers are initialized with the special '-1' value > meaning "un-assigned". > > Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> > Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> > --- > include/qemu/vfio-helpers.h | 6 +++- > util/vfio-helpers.c | 65 ++++++++++++++++++++++++++++++++++++- > util/trace-events | 1 + > 3 files changed, 70 insertions(+), 2 deletions(-) > > diff --git a/include/qemu/vfio-helpers.h b/include/qemu/vfio-helpers.h > index 4b97a904e93..492072cba2f 100644 > --- a/include/qemu/vfio-helpers.h > +++ b/include/qemu/vfio-helpers.h > @@ -1,11 +1,13 @@ > /* > * QEMU VFIO helpers > * > - * Copyright 2016 - 2018 Red Hat, Inc. > + * Copyright 2016 - 2020 Red Hat, Inc. > * > * Authors: > * Fam Zheng <famz@redhat.com> > + * Philippe Mathieu-Daudé <philmd@redhat.com> > * > + * SPDX-License-Identifier: GPL-2.0-or-later > * This work is licensed under the terms of the GNU GPL, version 2 or later. > * See the COPYING file in the top-level directory. > */ > @@ -29,5 +31,7 @@ void qemu_vfio_pci_unmap_bar(QEMUVFIOState *s, int index, void *bar, > uint64_t offset, uint64_t size); > int qemu_vfio_pci_init_irq(QEMUVFIOState *s, EventNotifier *e, > int irq_type, Error **errp); > +int qemu_vfio_pci_msix_init_irqs(QEMUVFIOState *s, > + unsigned *irq_count, Error **errp); > > #endif > diff --git a/util/vfio-helpers.c b/util/vfio-helpers.c > index 874d76c2a2a..d88e2c7dc1f 100644 > --- a/util/vfio-helpers.c > +++ b/util/vfio-helpers.c > @@ -1,11 +1,13 @@ > /* > * VFIO utility > * > - * Copyright 2016 - 2018 Red Hat, Inc. > + * Copyright 2016 - 2020 Red Hat, Inc. > * > * Authors: > * Fam Zheng <famz@redhat.com> > + * Philippe Mathieu-Daudé <philmd@redhat.com> > * > + * SPDX-License-Identifier: GPL-2.0-or-later > * This work is licensed under the terms of the GNU GPL, version 2 or later. > * See the COPYING file in the top-level directory. > */ > @@ -230,6 +232,67 @@ int qemu_vfio_pci_init_irq(QEMUVFIOState *s, EventNotifier *e, > return 0; > } > > +/** > + * Initialize device MSIX IRQs and register event notifiers. > + * @irq_count: pointer to number of MSIX IRQs to initialize > + * > + * If the number of IRQs requested exceeds the available on the device, > + * store the number of available IRQs in @irq_count and return -EOVERFLOW. > + */ > +int qemu_vfio_pci_msix_init_irqs(QEMUVFIOState *s, > + unsigned *irq_count, Error **errp) > +{ > + int r; > + size_t irq_set_size; > + struct vfio_irq_set *irq_set; > + struct vfio_irq_info irq_info = { > + .argsz = sizeof(irq_info), > + .index = VFIO_PCI_MSIX_IRQ_INDEX > + }; > + > + if (ioctl(s->device, VFIO_DEVICE_GET_IRQ_INFO, &irq_info)) { > + error_setg_errno(errp, errno, "Failed to get device interrupt info"); > + return -errno; > + } > + trace_qemu_vfio_msix_info_irqs(irq_info.count, *irq_count); > + if (irq_info.count < *irq_count) { > + error_setg(errp, "Not enough device interrupts available"); > + *irq_count = irq_info.count; > + return -EOVERFLOW; > + } > + if (!(irq_info.flags & VFIO_IRQ_INFO_EVENTFD)) { > + error_setg(errp, "Device interrupt doesn't support eventfd"); > + return -EINVAL; > + } > + > + irq_set_size = sizeof(*irq_set) + *irq_count * sizeof(int32_t); > + irq_set = g_malloc0(irq_set_size); > + > + /* Get to a known IRQ state */ > + *irq_set = (struct vfio_irq_set) { > + .argsz = irq_set_size, > + .flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER, > + .index = VFIO_PCI_MSIX_IRQ_INDEX, > + .start = 0, > + .count = *irq_count, > + }; > + > + for (unsigned i = 0; i < *irq_count; i++) { > + ((int32_t *)&irq_set->data)[i] = -1; /* un-assigned: skip */ > + } > + r = ioctl(s->device, VFIO_DEVICE_SET_IRQS, irq_set); > + g_free(irq_set); > + if (r < 0) { > + error_setg_errno(errp, errno, "Failed to setup device interrupts"); > + return -errno; > + } else if (r > 0) { Can it happen? Thanks Eric > + error_setg(errp, "Not enough device interrupts available"); > + *irq_count = r; > + return -EOVERFLOW; > + } > + return 0; > +} > + > static int qemu_vfio_pci_read_config(QEMUVFIOState *s, void *buf, > int size, int ofs) > { > diff --git a/util/trace-events b/util/trace-events > index 3c36def9f30..ec93578b125 100644 > --- a/util/trace-events > +++ b/util/trace-events > @@ -87,6 +87,7 @@ qemu_vfio_do_mapping(void *s, void *host, uint64_t iova, size_t size) "s %p host > qemu_vfio_dma_map(void *s, void *host, size_t size, bool temporary, uint64_t *iova) "s %p host %p size 0x%zx temporary %d &iova %p" > qemu_vfio_dma_mapped(void *s, void *host, uint64_t iova, size_t size) "s %p host %p <-> iova 0x%"PRIx64" size 0x%zx" > qemu_vfio_dma_unmap(void *s, void *host) "s %p host %p" > +qemu_vfio_msix_info_irqs(uint32_t count, unsigned asked) "msix irqs %"PRIu32" (asked: %u)" > qemu_vfio_iommu_iova_pgsizes(uint64_t iova_pgsizes) "iommu page size bitmask: 0x%08"PRIx64 > qemu_vfio_pci_read_config(void *buf, int ofs, int size, uint64_t region_ofs, uint64_t region_size) "read cfg ptr %p ofs 0x%x size %d (region ofs 0x%"PRIx64" size %"PRId64")" > qemu_vfio_pci_write_config(void *buf, int ofs, int size, uint64_t region_ofs, uint64_t region_size) "write cfg ptr %p ofs 0x%x size %d (region ofs 0x%"PRIx64" size %"PRId64")" >
diff --git a/include/qemu/vfio-helpers.h b/include/qemu/vfio-helpers.h index 4b97a904e93..492072cba2f 100644 --- a/include/qemu/vfio-helpers.h +++ b/include/qemu/vfio-helpers.h @@ -1,11 +1,13 @@ /* * QEMU VFIO helpers * - * Copyright 2016 - 2018 Red Hat, Inc. + * Copyright 2016 - 2020 Red Hat, Inc. * * Authors: * Fam Zheng <famz@redhat.com> + * Philippe Mathieu-Daudé <philmd@redhat.com> * + * SPDX-License-Identifier: GPL-2.0-or-later * This work is licensed under the terms of the GNU GPL, version 2 or later. * See the COPYING file in the top-level directory. */ @@ -29,5 +31,7 @@ void qemu_vfio_pci_unmap_bar(QEMUVFIOState *s, int index, void *bar, uint64_t offset, uint64_t size); int qemu_vfio_pci_init_irq(QEMUVFIOState *s, EventNotifier *e, int irq_type, Error **errp); +int qemu_vfio_pci_msix_init_irqs(QEMUVFIOState *s, + unsigned *irq_count, Error **errp); #endif diff --git a/util/vfio-helpers.c b/util/vfio-helpers.c index 874d76c2a2a..d88e2c7dc1f 100644 --- a/util/vfio-helpers.c +++ b/util/vfio-helpers.c @@ -1,11 +1,13 @@ /* * VFIO utility * - * Copyright 2016 - 2018 Red Hat, Inc. + * Copyright 2016 - 2020 Red Hat, Inc. * * Authors: * Fam Zheng <famz@redhat.com> + * Philippe Mathieu-Daudé <philmd@redhat.com> * + * SPDX-License-Identifier: GPL-2.0-or-later * This work is licensed under the terms of the GNU GPL, version 2 or later. * See the COPYING file in the top-level directory. */ @@ -230,6 +232,67 @@ int qemu_vfio_pci_init_irq(QEMUVFIOState *s, EventNotifier *e, return 0; } +/** + * Initialize device MSIX IRQs and register event notifiers. + * @irq_count: pointer to number of MSIX IRQs to initialize + * + * If the number of IRQs requested exceeds the available on the device, + * store the number of available IRQs in @irq_count and return -EOVERFLOW. + */ +int qemu_vfio_pci_msix_init_irqs(QEMUVFIOState *s, + unsigned *irq_count, Error **errp) +{ + int r; + size_t irq_set_size; + struct vfio_irq_set *irq_set; + struct vfio_irq_info irq_info = { + .argsz = sizeof(irq_info), + .index = VFIO_PCI_MSIX_IRQ_INDEX + }; + + if (ioctl(s->device, VFIO_DEVICE_GET_IRQ_INFO, &irq_info)) { + error_setg_errno(errp, errno, "Failed to get device interrupt info"); + return -errno; + } + trace_qemu_vfio_msix_info_irqs(irq_info.count, *irq_count); + if (irq_info.count < *irq_count) { + error_setg(errp, "Not enough device interrupts available"); + *irq_count = irq_info.count; + return -EOVERFLOW; + } + if (!(irq_info.flags & VFIO_IRQ_INFO_EVENTFD)) { + error_setg(errp, "Device interrupt doesn't support eventfd"); + return -EINVAL; + } + + irq_set_size = sizeof(*irq_set) + *irq_count * sizeof(int32_t); + irq_set = g_malloc0(irq_set_size); + + /* Get to a known IRQ state */ + *irq_set = (struct vfio_irq_set) { + .argsz = irq_set_size, + .flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER, + .index = VFIO_PCI_MSIX_IRQ_INDEX, + .start = 0, + .count = *irq_count, + }; + + for (unsigned i = 0; i < *irq_count; i++) { + ((int32_t *)&irq_set->data)[i] = -1; /* un-assigned: skip */ + } + r = ioctl(s->device, VFIO_DEVICE_SET_IRQS, irq_set); + g_free(irq_set); + if (r < 0) { + error_setg_errno(errp, errno, "Failed to setup device interrupts"); + return -errno; + } else if (r > 0) { + error_setg(errp, "Not enough device interrupts available"); + *irq_count = r; + return -EOVERFLOW; + } + return 0; +} + static int qemu_vfio_pci_read_config(QEMUVFIOState *s, void *buf, int size, int ofs) { diff --git a/util/trace-events b/util/trace-events index 3c36def9f30..ec93578b125 100644 --- a/util/trace-events +++ b/util/trace-events @@ -87,6 +87,7 @@ qemu_vfio_do_mapping(void *s, void *host, uint64_t iova, size_t size) "s %p host qemu_vfio_dma_map(void *s, void *host, size_t size, bool temporary, uint64_t *iova) "s %p host %p size 0x%zx temporary %d &iova %p" qemu_vfio_dma_mapped(void *s, void *host, uint64_t iova, size_t size) "s %p host %p <-> iova 0x%"PRIx64" size 0x%zx" qemu_vfio_dma_unmap(void *s, void *host) "s %p host %p" +qemu_vfio_msix_info_irqs(uint32_t count, unsigned asked) "msix irqs %"PRIu32" (asked: %u)" qemu_vfio_iommu_iova_pgsizes(uint64_t iova_pgsizes) "iommu page size bitmask: 0x%08"PRIx64 qemu_vfio_pci_read_config(void *buf, int ofs, int size, uint64_t region_ofs, uint64_t region_size) "read cfg ptr %p ofs 0x%x size %d (region ofs 0x%"PRIx64" size %"PRId64")" qemu_vfio_pci_write_config(void *buf, int ofs, int size, uint64_t region_ofs, uint64_t region_size) "write cfg ptr %p ofs 0x%x size %d (region ofs 0x%"PRIx64" size %"PRId64")"