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| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2017-04-13 10:05:27 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-04-28 14:26:54 +0300 |
| commit | e49a6a2173346d316c0e65d054a3cda89d57cb53 (patch) | |
| tree | e40d092f9292260039f1bf52231cf6e3a7550ad3 /arch/powerpc/platforms/powernv/pci-ioda.c | |
| parent | 82eae1afbbdcaf2d716f88025736dc2d6f7afbf0 (diff) | |
| download | linux-e49a6a2173346d316c0e65d054a3cda89d57cb53.tar.xz | |
powerpc/powernv: Fix iommu table size calculation hook for small tables
When the userspace requests a small TCE table (which takes less than
the system page size) and more than 1 TCE level, the existing code
returns a single page size which is a bug as each additional TCE level
requires at least one page and this is what
pnv_pci_ioda2_table_alloc_pages() does. And we end up seeing
WARN_ON(!ret && ((*ptbl)->it_allocated_size != table_size))
in drivers/vfio/vfio_iommu_spapr_tce.c.
This replaces incorrect _ALIGN_UP() (which aligns zero up to zero) with
max_t() to fix the bug.
Besides removing WARN_ON(), there should be no other changes in
behaviour.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/platforms/powernv/pci-ioda.c')
| -rw-r--r-- | arch/powerpc/platforms/powernv/pci-ioda.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index bc5466d447e7..16fd322b2eea 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -2440,7 +2440,8 @@ static unsigned long pnv_pci_ioda2_get_table_size(__u32 page_shift, tce_table_size /= direct_table_size; tce_table_size <<= 3; - tce_table_size = _ALIGN_UP(tce_table_size, direct_table_size); + tce_table_size = max_t(unsigned long, + tce_table_size, direct_table_size); } return bytes; |