From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:50270 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730854AbgIJPAR (ORCPT ); Thu, 10 Sep 2020 11:00:17 -0400 From: Matthew Rosato Subject: [PATCH v5 1/3] PCI/IOV: Mark VFs as not implementing PCI_COMMAND_MEMORY Date: Thu, 10 Sep 2020 10:59:55 -0400 Message-Id: <1599749997-30489-2-git-send-email-mjrosato@linux.ibm.com> In-Reply-To: <1599749997-30489-1-git-send-email-mjrosato@linux.ibm.com> References: <1599749997-30489-1-git-send-email-mjrosato@linux.ibm.com> Sender: linux-s390-owner@vger.kernel.org List-ID: To: alex.williamson@redhat.com, bhelgaas@google.com Cc: schnelle@linux.ibm.com, pmorel@linux.ibm.com, mpe@ellerman.id.au, oohall@gmail.com, cohuck@redhat.com, kevin.tian@intel.com, hca@linux.ibm.com, gor@linux.ibm.com, borntraeger@de.ibm.com, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-pci@vger.kernel.org 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 --- 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