[PATCH v4 4/5] PCI: Handle Enhanced Allocation (EA) capability for SRIOV devices.
From: David Daney <hidden>
Date: 2015-10-02 22:39:25
Also in:
linux-pci, lkml
Subsystem:
pci subsystem, the rest · Maintainers:
Bjorn Helgaas, Linus Torvalds
From: David Daney <redacted> SRIOV BARs can be specified via EA entries. Extend the EA parser to extract the SRIOV BAR resources, and modify sriov_init() to use resources previously obtained via EA. Signed-off-by: David Daney <redacted> --- drivers/pci/iov.c | 11 +++++++++-- drivers/pci/pci.c | 5 +++++ 2 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index ee0ebff..c789e68 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c@@ -436,8 +436,15 @@ found: nres = 0; for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { res = &dev->resource[i + PCI_IOV_RESOURCES]; - bar64 = __pci_read_base(dev, pci_bar_unknown, res, - pos + PCI_SRIOV_BAR + i * 4); + /* + * If it is already FIXED, don't change it, something + * (perhaps EA or header fixups) wants it this way. + */ + if (res->flags & IORESOURCE_PCI_FIXED) + bar64 = (res->flags & IORESOURCE_MEM_64) ? 1 : 0; + else + bar64 = __pci_read_base(dev, pci_bar_unknown, res, + pos + PCI_SRIOV_BAR + i * 4); if (!res->flags) continue; if (resource_size(res) & (PAGE_SIZE - 1)) {
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 54a0a98..6750edf 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c@@ -2178,6 +2178,11 @@ static struct resource *pci_ea_get_resource(struct pci_dev *dev, u8 bei, u8 prop { if (bei <= PCI_EA_BEI_BAR5 && prop <= PCI_EA_P_IO) return &dev->resource[bei]; +#ifdef CONFIG_PCI_IOV + else if (bei >= PCI_EA_BEI_VF_BAR0 && bei <= PCI_EA_BEI_VF_BAR5 && + (prop == PCI_EA_P_VIRT_MEM || prop == PCI_EA_P_VIRT_MEM_PREFETCH)) + return &dev->resource[PCI_IOV_RESOURCES + bei - PCI_EA_BEI_VF_BAR0]; +#endif else if (bei == PCI_EA_BEI_ROM) return &dev->resource[PCI_ROM_RESOURCE]; else
--
1.9.1