diff options
Diffstat (limited to 'hw/s390x/s390-pci-vfio.c')
| -rw-r--r-- | hw/s390x/s390-pci-vfio.c | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/hw/s390x/s390-pci-vfio.c b/hw/s390x/s390-pci-vfio.c new file mode 100644 index 0000000000..d5c78063b5 --- /dev/null +++ b/hw/s390x/s390-pci-vfio.c @@ -0,0 +1,276 @@ +/* + * 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 <linux/vfio.h> +#include <linux/vfio_zdev.h> + +#include "qemu/osdep.h" +#include "trace.h" +#include "hw/s390x/s390-pci-bus.h" +#include "hw/s390x/s390-pci-clp.h" +#include "hw/s390x/s390-pci-vfio.h" +#include "hw/vfio/pci.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); +} + +S390PCIDMACount *s390_pci_start_dma_count(S390pciState *s, + S390PCIBusDevice *pbdev) +{ + S390PCIDMACount *cnt; + uint32_t avail; + VFIOPCIDevice *vpdev = container_of(pbdev->pdev, VFIOPCIDevice, pdev); + int id; + + assert(vpdev); + + id = vpdev->vbasedev.group->container->fd; + + if (!s390_pci_update_dma_avail(id, &avail)) { + return NULL; + } + + QTAILQ_FOREACH(cnt, &s->zpci_dma_limit, link) { + if (cnt->id == id) { + cnt->users++; + return cnt; + } + } + + cnt = g_new0(S390PCIDMACount, 1); + cnt->id = id; + cnt->users = 1; + cnt->avail = avail; + QTAILQ_INSERT_TAIL(&s->zpci_dma_limit, cnt, link); + return cnt; +} + +void s390_pci_end_dma_count(S390pciState *s, S390PCIDMACount *cnt) +{ + assert(cnt); + + cnt->users--; + if (cnt->users == 0) { + QTAILQ_REMOVE(&s->zpci_dma_limit, cnt, link); + } +} + +static void s390_pci_read_base(S390PCIBusDevice *pbdev, + struct vfio_device_info *info) +{ + struct vfio_info_cap_header *hdr; + struct vfio_device_info_cap_zpci_base *cap; + VFIOPCIDevice *vpci = container_of(pbdev->pdev, VFIOPCIDevice, pdev); + + hdr = vfio_get_device_info_cap(info, VFIO_DEVICE_INFO_CAP_ZPCI_BASE); + + /* If capability not provided, just leave the defaults in place */ + if (hdr == NULL) { + trace_s390_pci_clp_cap(vpci->vbasedev.name, + VFIO_DEVICE_INFO_CAP_ZPCI_BASE); + return; + } + cap = (void *) hdr; + + pbdev->zpci_fn.sdma = cap->start_dma; + pbdev->zpci_fn.edma = cap->end_dma; + pbdev->zpci_fn.pchid = cap->pchid; + pbdev->zpci_fn.vfn = cap->vfn; + pbdev->zpci_fn.pfgid = cap->gid; + /* The following values remain 0 until we support other FMB formats */ + pbdev->zpci_fn.fmbl = 0; + pbdev->zpci_fn.pft = 0; +} + +static void s390_pci_read_group(S390PCIBusDevice *pbdev, + struct vfio_device_info *info) +{ + struct vfio_info_cap_header *hdr; + struct vfio_device_info_cap_zpci_group *cap; + ClpRspQueryPciGrp *resgrp; + VFIOPCIDevice *vpci = container_of(pbdev->pdev, VFIOPCIDevice, pdev); + + hdr = vfio_get_device_info_cap(info, VFIO_DEVICE_INFO_CAP_ZPCI_GROUP); + + /* If capability not provided, just use the default group */ + if (hdr == NULL) { + trace_s390_pci_clp_cap(vpci->vbasedev.name, + VFIO_DEVICE_INFO_CAP_ZPCI_GROUP); + pbdev->zpci_fn.pfgid = ZPCI_DEFAULT_FN_GRP; + pbdev->pci_group = s390_group_find(ZPCI_DEFAULT_FN_GRP); + return; + } + cap = (void *) hdr; + + /* See if the PCI group is already defined, create if not */ + pbdev->pci_group = s390_group_find(pbdev->zpci_fn.pfgid); + + if (!pbdev->pci_group) { + pbdev->pci_group = s390_group_create(pbdev->zpci_fn.pfgid); + + resgrp = &pbdev->pci_group->zpci_group; + if (cap->flags & VFIO_DEVICE_INFO_ZPCI_FLAG_REFRESH) { + resgrp->fr = 1; + } + stq_p(&resgrp->dasm, cap->dasm); + stq_p(&resgrp->msia, cap->msi_addr); + stw_p(&resgrp->mui, cap->mui); + stw_p(&resgrp->i, cap->noi); + stw_p(&resgrp->maxstbl, cap->maxstbl); + stb_p(&resgrp->version, cap->version); + } +} + +static void s390_pci_read_util(S390PCIBusDevice *pbdev, + struct vfio_device_info *info) +{ + struct vfio_info_cap_header *hdr; + struct vfio_device_info_cap_zpci_util *cap; + VFIOPCIDevice *vpci = container_of(pbdev->pdev, VFIOPCIDevice, pdev); + + hdr = vfio_get_device_info_cap(info, VFIO_DEVICE_INFO_CAP_ZPCI_UTIL); + + /* If capability not provided, just leave the defaults in place */ + if (hdr == NULL) { + trace_s390_pci_clp_cap(vpci->vbasedev.name, + VFIO_DEVICE_INFO_CAP_ZPCI_UTIL); + return; + } + cap = (void *) hdr; + + if (cap->size > CLP_UTIL_STR_LEN) { + trace_s390_pci_clp_cap_size(vpci->vbasedev.name, cap->size, + VFIO_DEVICE_INFO_CAP_ZPCI_UTIL); + return; + } + + pbdev->zpci_fn.flags |= CLP_RSP_QPCI_MASK_UTIL; + memcpy(pbdev->zpci_fn.util_str, cap->util_str, CLP_UTIL_STR_LEN); +} + +static void s390_pci_read_pfip(S390PCIBusDevice *pbdev, + struct vfio_device_info *info) +{ + struct vfio_info_cap_header *hdr; + struct vfio_device_info_cap_zpci_pfip *cap; + VFIOPCIDevice *vpci = container_of(pbdev->pdev, VFIOPCIDevice, pdev); + + hdr = vfio_get_device_info_cap(info, VFIO_DEVICE_INFO_CAP_ZPCI_PFIP); + + /* If capability not provided, just leave the defaults in place */ + if (hdr == NULL) { + trace_s390_pci_clp_cap(vpci->vbasedev.name, + VFIO_DEVICE_INFO_CAP_ZPCI_PFIP); + return; + } + cap = (void *) hdr; + + if (cap->size > CLP_PFIP_NR_SEGMENTS) { + trace_s390_pci_clp_cap_size(vpci->vbasedev.name, cap->size, + VFIO_DEVICE_INFO_CAP_ZPCI_PFIP); + return; + } + + memcpy(pbdev->zpci_fn.pfip, cap->pfip, CLP_PFIP_NR_SEGMENTS); +} + +/* + * This function will issue the VFIO_DEVICE_GET_INFO ioctl and look for + * capabilities that contain information about CLP features provided by the + * underlying host. + * On entry, defaults have already been placed into the guest CLP response + * buffers. On exit, defaults will have been overwritten for any CLP features + * found in the capability chain; defaults will remain for any CLP features not + * found in the chain. + */ +void s390_pci_get_clp_info(S390PCIBusDevice *pbdev) +{ + g_autofree struct vfio_device_info *info; + VFIOPCIDevice *vfio_pci; + uint32_t argsz; + int fd; + + argsz = sizeof(*info); + info = g_malloc0(argsz); + + vfio_pci = container_of(pbdev->pdev, VFIOPCIDevice, pdev); + fd = vfio_pci->vbasedev.fd; + + /* + * 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. On error, + * just exit and rely on CLP defaults. + */ +retry: + info->argsz = argsz; + + if (ioctl(fd, VFIO_DEVICE_GET_INFO, info)) { + trace_s390_pci_clp_dev_info(vfio_pci->vbasedev.name); + return; + } + + if (info->argsz > argsz) { + argsz = info->argsz; + info = g_realloc(info, argsz); + goto retry; + } + + /* + * Find the CLP features provided and fill in the guest CLP responses. + * Always call s390_pci_read_base first as information from this could + * determine which function group is used in s390_pci_read_group. + * For any feature not found, the default values will remain in the CLP + * response. + */ + s390_pci_read_base(pbdev, info); + s390_pci_read_group(pbdev, info); + s390_pci_read_util(pbdev, info); + s390_pci_read_pfip(pbdev, info); + + return; +} |