276 lines
8.3 KiB
C
276 lines
8.3 KiB
C
/*
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* s390 vfio-pci interfaces
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*
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* Copyright 2020 IBM Corp.
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* Author(s): Matthew Rosato <mjrosato@linux.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#include "qemu/osdep.h"
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#include <sys/ioctl.h>
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#include <linux/vfio.h>
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#include <linux/vfio_zdev.h>
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#include "trace.h"
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#include "hw/s390x/s390-pci-bus.h"
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#include "hw/s390x/s390-pci-clp.h"
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#include "hw/s390x/s390-pci-vfio.h"
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#include "hw/vfio/pci.h"
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#include "hw/vfio/vfio-common.h"
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/*
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* Get the current DMA available count from vfio. Returns true if vfio is
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* limiting DMA requests, false otherwise. The current available count read
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* from vfio is returned in avail.
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*/
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bool s390_pci_update_dma_avail(int fd, unsigned int *avail)
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{
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uint32_t argsz = sizeof(struct vfio_iommu_type1_info);
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g_autofree struct vfio_iommu_type1_info *info = g_malloc0(argsz);
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assert(avail);
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/*
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* If the specified argsz is not large enough to contain all capabilities
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* it will be updated upon return from the ioctl. Retry until we have
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* a big enough buffer to hold the entire capability chain.
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*/
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retry:
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info->argsz = argsz;
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if (ioctl(fd, VFIO_IOMMU_GET_INFO, info)) {
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return false;
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}
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if (info->argsz > argsz) {
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argsz = info->argsz;
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info = g_realloc(info, argsz);
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goto retry;
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}
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/* If the capability exists, update with the current value */
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return vfio_get_info_dma_avail(info, avail);
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}
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S390PCIDMACount *s390_pci_start_dma_count(S390pciState *s,
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S390PCIBusDevice *pbdev)
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{
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S390PCIDMACount *cnt;
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uint32_t avail;
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VFIOPCIDevice *vpdev = container_of(pbdev->pdev, VFIOPCIDevice, pdev);
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int id;
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assert(vpdev);
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id = vpdev->vbasedev.group->container->fd;
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if (!s390_pci_update_dma_avail(id, &avail)) {
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return NULL;
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}
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QTAILQ_FOREACH(cnt, &s->zpci_dma_limit, link) {
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if (cnt->id == id) {
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cnt->users++;
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return cnt;
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}
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}
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cnt = g_new0(S390PCIDMACount, 1);
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cnt->id = id;
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cnt->users = 1;
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cnt->avail = avail;
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QTAILQ_INSERT_TAIL(&s->zpci_dma_limit, cnt, link);
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return cnt;
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}
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void s390_pci_end_dma_count(S390pciState *s, S390PCIDMACount *cnt)
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{
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assert(cnt);
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cnt->users--;
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if (cnt->users == 0) {
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QTAILQ_REMOVE(&s->zpci_dma_limit, cnt, link);
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}
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}
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static void s390_pci_read_base(S390PCIBusDevice *pbdev,
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struct vfio_device_info *info)
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{
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struct vfio_info_cap_header *hdr;
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struct vfio_device_info_cap_zpci_base *cap;
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VFIOPCIDevice *vpci = container_of(pbdev->pdev, VFIOPCIDevice, pdev);
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hdr = vfio_get_device_info_cap(info, VFIO_DEVICE_INFO_CAP_ZPCI_BASE);
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/* If capability not provided, just leave the defaults in place */
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if (hdr == NULL) {
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trace_s390_pci_clp_cap(vpci->vbasedev.name,
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VFIO_DEVICE_INFO_CAP_ZPCI_BASE);
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return;
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}
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cap = (void *) hdr;
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pbdev->zpci_fn.sdma = cap->start_dma;
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pbdev->zpci_fn.edma = cap->end_dma;
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pbdev->zpci_fn.pchid = cap->pchid;
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pbdev->zpci_fn.vfn = cap->vfn;
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pbdev->zpci_fn.pfgid = cap->gid;
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/* The following values remain 0 until we support other FMB formats */
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pbdev->zpci_fn.fmbl = 0;
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pbdev->zpci_fn.pft = 0;
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}
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static void s390_pci_read_group(S390PCIBusDevice *pbdev,
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struct vfio_device_info *info)
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{
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struct vfio_info_cap_header *hdr;
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struct vfio_device_info_cap_zpci_group *cap;
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ClpRspQueryPciGrp *resgrp;
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VFIOPCIDevice *vpci = container_of(pbdev->pdev, VFIOPCIDevice, pdev);
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hdr = vfio_get_device_info_cap(info, VFIO_DEVICE_INFO_CAP_ZPCI_GROUP);
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/* If capability not provided, just use the default group */
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if (hdr == NULL) {
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trace_s390_pci_clp_cap(vpci->vbasedev.name,
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VFIO_DEVICE_INFO_CAP_ZPCI_GROUP);
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pbdev->zpci_fn.pfgid = ZPCI_DEFAULT_FN_GRP;
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pbdev->pci_group = s390_group_find(ZPCI_DEFAULT_FN_GRP);
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return;
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}
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cap = (void *) hdr;
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/* See if the PCI group is already defined, create if not */
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pbdev->pci_group = s390_group_find(pbdev->zpci_fn.pfgid);
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if (!pbdev->pci_group) {
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pbdev->pci_group = s390_group_create(pbdev->zpci_fn.pfgid);
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resgrp = &pbdev->pci_group->zpci_group;
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if (cap->flags & VFIO_DEVICE_INFO_ZPCI_FLAG_REFRESH) {
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resgrp->fr = 1;
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}
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resgrp->dasm = cap->dasm;
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resgrp->msia = cap->msi_addr;
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resgrp->mui = cap->mui;
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resgrp->i = cap->noi;
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resgrp->maxstbl = cap->maxstbl;
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resgrp->version = cap->version;
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resgrp->dtsm = ZPCI_DTSM;
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}
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}
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static void s390_pci_read_util(S390PCIBusDevice *pbdev,
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struct vfio_device_info *info)
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{
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struct vfio_info_cap_header *hdr;
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struct vfio_device_info_cap_zpci_util *cap;
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VFIOPCIDevice *vpci = container_of(pbdev->pdev, VFIOPCIDevice, pdev);
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hdr = vfio_get_device_info_cap(info, VFIO_DEVICE_INFO_CAP_ZPCI_UTIL);
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/* If capability not provided, just leave the defaults in place */
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if (hdr == NULL) {
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trace_s390_pci_clp_cap(vpci->vbasedev.name,
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VFIO_DEVICE_INFO_CAP_ZPCI_UTIL);
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return;
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}
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cap = (void *) hdr;
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if (cap->size > CLP_UTIL_STR_LEN) {
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trace_s390_pci_clp_cap_size(vpci->vbasedev.name, cap->size,
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VFIO_DEVICE_INFO_CAP_ZPCI_UTIL);
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return;
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}
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pbdev->zpci_fn.flags |= CLP_RSP_QPCI_MASK_UTIL;
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memcpy(pbdev->zpci_fn.util_str, cap->util_str, CLP_UTIL_STR_LEN);
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}
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static void s390_pci_read_pfip(S390PCIBusDevice *pbdev,
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struct vfio_device_info *info)
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{
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struct vfio_info_cap_header *hdr;
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struct vfio_device_info_cap_zpci_pfip *cap;
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VFIOPCIDevice *vpci = container_of(pbdev->pdev, VFIOPCIDevice, pdev);
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hdr = vfio_get_device_info_cap(info, VFIO_DEVICE_INFO_CAP_ZPCI_PFIP);
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/* If capability not provided, just leave the defaults in place */
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if (hdr == NULL) {
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trace_s390_pci_clp_cap(vpci->vbasedev.name,
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VFIO_DEVICE_INFO_CAP_ZPCI_PFIP);
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return;
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}
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cap = (void *) hdr;
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if (cap->size > CLP_PFIP_NR_SEGMENTS) {
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trace_s390_pci_clp_cap_size(vpci->vbasedev.name, cap->size,
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VFIO_DEVICE_INFO_CAP_ZPCI_PFIP);
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return;
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}
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memcpy(pbdev->zpci_fn.pfip, cap->pfip, CLP_PFIP_NR_SEGMENTS);
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}
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/*
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* This function will issue the VFIO_DEVICE_GET_INFO ioctl and look for
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* capabilities that contain information about CLP features provided by the
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* underlying host.
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* On entry, defaults have already been placed into the guest CLP response
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* buffers. On exit, defaults will have been overwritten for any CLP features
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* found in the capability chain; defaults will remain for any CLP features not
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* found in the chain.
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*/
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void s390_pci_get_clp_info(S390PCIBusDevice *pbdev)
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{
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g_autofree struct vfio_device_info *info = NULL;
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VFIOPCIDevice *vfio_pci;
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uint32_t argsz;
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int fd;
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argsz = sizeof(*info);
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info = g_malloc0(argsz);
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vfio_pci = container_of(pbdev->pdev, VFIOPCIDevice, pdev);
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fd = vfio_pci->vbasedev.fd;
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/*
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* If the specified argsz is not large enough to contain all capabilities
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* it will be updated upon return from the ioctl. Retry until we have
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* a big enough buffer to hold the entire capability chain. On error,
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* just exit and rely on CLP defaults.
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*/
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retry:
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info->argsz = argsz;
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if (ioctl(fd, VFIO_DEVICE_GET_INFO, info)) {
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trace_s390_pci_clp_dev_info(vfio_pci->vbasedev.name);
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return;
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}
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if (info->argsz > argsz) {
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argsz = info->argsz;
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info = g_realloc(info, argsz);
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goto retry;
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}
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/*
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* Find the CLP features provided and fill in the guest CLP responses.
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* Always call s390_pci_read_base first as information from this could
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* determine which function group is used in s390_pci_read_group.
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* For any feature not found, the default values will remain in the CLP
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* response.
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*/
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s390_pci_read_base(pbdev, info);
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s390_pci_read_group(pbdev, info);
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s390_pci_read_util(pbdev, info);
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s390_pci_read_pfip(pbdev, info);
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return;
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}
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