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| author | Sam Bobroff <sbobroff@linux.ibm.com> | 2018-07-30 04:59:14 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-07-31 12:56:46 +0300 |
| commit | b87b9cf4935325c98522823caeddd333022a1c62 (patch) | |
| tree | 85881cddabc7986e3e103435c95f0f5f530a9f81 | |
| parent | e0da99123f3c80f679d1b40a4321c1478bef14f7 (diff) | |
| download | linux-b87b9cf4935325c98522823caeddd333022a1c62.tar.xz | |
powerpc/pseries: fix EEH recovery of some IOV devices
EEH recovery currently fails on pSeries for some IOV capable PCI
devices, if CONFIG_PCI_IOV is on and the hypervisor doesn't provide
certain device tree properties for the device. (Found on an IOV
capable device using the ipr driver.)
Recovery fails in pci_enable_resources() at the check on r->parent,
because r->flags is set and r->parent is not. This state is due to
sriov_init() setting the start, end and flags members of the IOV BARs
but the parent not being set later in
pseries_pci_fixup_iov_resources(), because the
"ibm,open-sriov-vf-bar-info" property is missing.
Correct this by zeroing the resource flags for IOV BARs when they
can't be configured (this is the same method used by sriov_init() and
__pci_read_base()).
VFs cleared this way can't be enabled later, because that requires
another device tree property, "ibm,number-of-configurable-vfs" as well
as support for the RTAS function "ibm_map_pes". These are all part of
hypervisor support for IOV and it seems unlikely that a hypervisor
would ever partially, but not fully, support it. (None are currently
provided by QEMU/KVM.)
Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com>
Reviewed-by: Bryant G. Ly <bryantly@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
| -rw-r--r-- | arch/powerpc/platforms/pseries/setup.c | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c index e14ccf32a97d..9948ad16f788 100644 --- a/arch/powerpc/platforms/pseries/setup.c +++ b/arch/powerpc/platforms/pseries/setup.c @@ -647,6 +647,15 @@ void of_pci_parse_iov_addrs(struct pci_dev *dev, const int *indexes) } } +static void pseries_disable_sriov_resources(struct pci_dev *pdev) +{ + int i; + + pci_warn(pdev, "No hypervisor support for SR-IOV on this device, IOV BARs disabled.\n"); + for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) + pdev->resource[i + PCI_IOV_RESOURCES].flags = 0; +} + static void pseries_pci_fixup_resources(struct pci_dev *pdev) { const int *indexes; @@ -654,10 +663,10 @@ static void pseries_pci_fixup_resources(struct pci_dev *pdev) /*Firmware must support open sriov otherwise dont configure*/ indexes = of_get_property(dn, "ibm,open-sriov-vf-bar-info", NULL); - if (!indexes) - return; - /* Assign the addresses from device tree*/ - of_pci_set_vf_bar_size(pdev, indexes); + if (indexes) + of_pci_set_vf_bar_size(pdev, indexes); + else + pseries_disable_sriov_resources(pdev); } static void pseries_pci_fixup_iov_resources(struct pci_dev *pdev) @@ -669,10 +678,10 @@ static void pseries_pci_fixup_iov_resources(struct pci_dev *pdev) return; /*Firmware must support open sriov otherwise dont configure*/ indexes = of_get_property(dn, "ibm,open-sriov-vf-bar-info", NULL); - if (!indexes) - return; - /* Assign the addresses from device tree*/ - of_pci_parse_iov_addrs(pdev, indexes); + if (indexes) + of_pci_parse_iov_addrs(pdev, indexes); + else + pseries_disable_sriov_resources(pdev); } static resource_size_t pseries_pci_iov_resource_alignment(struct pci_dev *pdev, |