| Message ID | 1599749997-30489-2-git-send-email-mjrosato@linux.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | vfio/pci: Restore MMIO access for s390 detached VFs | expand |
On Thu, Sep 10, 2020 at 10:59:55AM -0400, Matthew Rosato wrote: > For VFs, the Memory Space Enable bit in the Command Register is > hard-wired to 0. > > Add a new bit to signify devices where the Command Register Memory > Space Enable bit does not control the device's response to MMIO > accesses. > > Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> > --- > drivers/pci/iov.c | 1 + > include/linux/pci.h | 1 + > 2 files changed, 2 insertions(+) > > diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c > index b37e08c..4afd4ee 100644 > --- a/drivers/pci/iov.c > +++ b/drivers/pci/iov.c > @@ -180,6 +180,7 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id) > virtfn->device = iov->vf_device; > virtfn->is_virtfn = 1; > virtfn->physfn = pci_dev_get(dev); > + virtfn->no_command_memory = 1; > > if (id == 0) > pci_read_vf_config_common(virtfn); > diff --git a/include/linux/pci.h b/include/linux/pci.h > index 8355306..3ff72312 100644 > --- a/include/linux/pci.h > +++ b/include/linux/pci.h > @@ -445,6 +445,7 @@ struct pci_dev { > unsigned int is_probed:1; /* Device probing in progress */ > unsigned int link_active_reporting:1;/* Device capable of reporting link active */ > unsigned int no_vf_scan:1; /* Don't scan for VFs after IOV enablement */ > + unsigned int no_command_memory:1; /* No PCI_COMMAND_MEMORY */ > pci_dev_flags_t dev_flags; > atomic_t enable_cnt; /* pci_enable_device has been called */ > > -- > 1.8.3.1 >
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index b37e08c..4afd4ee 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -180,6 +180,7 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id) virtfn->device = iov->vf_device; virtfn->is_virtfn = 1; virtfn->physfn = pci_dev_get(dev); + virtfn->no_command_memory = 1; if (id == 0) pci_read_vf_config_common(virtfn); diff --git a/include/linux/pci.h b/include/linux/pci.h index 8355306..3ff72312 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -445,6 +445,7 @@ struct pci_dev { unsigned int is_probed:1; /* Device probing in progress */ unsigned int link_active_reporting:1;/* Device capable of reporting link active */ unsigned int no_vf_scan:1; /* Don't scan for VFs after IOV enablement */ + unsigned int no_command_memory:1; /* No PCI_COMMAND_MEMORY */ pci_dev_flags_t dev_flags; atomic_t enable_cnt; /* pci_enable_device has been called */
For VFs, the Memory Space Enable bit in the Command Register is hard-wired to 0. Add a new bit to signify devices where the Command Register Memory Space Enable bit does not control the device's response to MMIO accesses. Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com> --- drivers/pci/iov.c | 1 + include/linux/pci.h | 1 + 2 files changed, 2 insertions(+)