From: Russell Currey <ruscur@russell.cc>
To: linuxppc-dev@lists.ozlabs.org
Cc: benh@kernel.crashing.org, aik@ozlabs.ru,
Russell Currey <ruscur@russell.cc>
Subject: [PATCH] powernv/pci: Fix m64 checks for SR-IOV and window alignment
Date: Wed, 14 Sep 2016 16:37:17 +1000 [thread overview]
Message-ID: <20160914063717.2673-1-ruscur@russell.cc> (raw)
Commit 5958d19a143e checks for prefetchable m64 BARs by comparing the
addresses instead of using resource flags. This broke SR-IOV as the m64
check in pnv_pci_ioda_fixup_iov_resources() fails.
The condition in pnv_pci_window_alignment() also changed to checking
only IORESOURCE_MEM_64 instead of both IORESOURCE_MEM_64 and
IORESOURCE_PREFETCH.
Revert these cases to the previous behaviour, adding a new helper function
to do so. This is named pnv_pci_is_m64_flags() to make it clear this
function is only looking at resource flags and should not be relied on for
non-SRIOV resources.
Fixes: 5958d19a143e ("Fix incorrect PE reservation attempt on some 64-bit BARs")
Reported-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Russell Currey <ruscur@russell.cc>
---
arch/powerpc/platforms/powernv/pci-ioda.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index c16d790..2f25622 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -124,6 +124,13 @@ static inline bool pnv_pci_is_m64(struct pnv_phb *phb, struct resource *r)
r->start < (phb->ioda.m64_base + phb->ioda.m64_size));
}
+static inline bool pnv_pci_is_m64_flags(unsigned long resource_flags)
+{
+ unsigned long flags = (IORESOURCE_MEM_64 | IORESOURCE_PREFETCH);
+
+ return (resource_flags & flags) == flags;
+}
+
static struct pnv_ioda_pe *pnv_ioda_init_pe(struct pnv_phb *phb, int pe_no)
{
phb->ioda.pe_array[pe_no].phb = phb;
@@ -2871,7 +2878,7 @@ static void pnv_pci_ioda_fixup_iov_resources(struct pci_dev *pdev)
res = &pdev->resource[i + PCI_IOV_RESOURCES];
if (!res->flags || res->parent)
continue;
- if (!pnv_pci_is_m64(phb, res)) {
+ if (!pnv_pci_is_m64_flags(res->flags)) {
dev_warn(&pdev->dev, "Don't support SR-IOV with"
" non M64 VF BAR%d: %pR. \n",
i, res);
@@ -3096,7 +3103,7 @@ static resource_size_t pnv_pci_window_alignment(struct pci_bus *bus,
* alignment for any 64-bit resource, PCIe doesn't care and
* bridges only do 64-bit prefetchable anyway.
*/
- if (phb->ioda.m64_segsize && (type & IORESOURCE_MEM_64))
+ if (phb->ioda.m64_segsize && pnv_pci_is_m64_flags(type))
return phb->ioda.m64_segsize;
if (type & IORESOURCE_MEM)
return phb->ioda.m32_segsize;
--
2.9.3
next reply other threads:[~2016-09-14 6:37 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-14 6:37 Russell Currey [this message]
2016-09-14 7:27 ` [PATCH] powernv/pci: Fix m64 checks for SR-IOV and window alignment Alexey Kardashevskiy
2016-09-14 7:51 ` Benjamin Herrenschmidt
2016-09-14 11:30 ` Gavin Shan
2016-09-19 6:37 ` Russell Currey
2016-09-19 10:45 ` Benjamin Herrenschmidt
2016-09-25 3:33 ` Michael Ellerman
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