[PATCH v2] powerpc/powernv/pci-ioda: fix kdump with non-power-of-2 crashkernel=

[Nishanth Aravamudan <nacc@linux.vnet.ibm.com>]

The 32-bit TCE table initialization relies on the DMA window having a
size equal to a power of 2 (and checks for it explicitly). But
crashkernel= has no constraint that requires a power-of-2 be specified.
This causes the kdump kernel to fail to boot as none of the PCI devices
(including the disk controller) are successfully initialized.

After this change, the PCI devices successfully set up the 32-bit TCE
table and kdump succeeds.

Fixes: aca6913f5551 ("powerpc/powernv/ioda2: Introduce helpers to allocate TCE pages")
Signed-off-by: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org # 4.2

---

Michael, I kept this as a follow-on patch to my previous one. If you'd
rather I made a v3 of that patch with the two fixes combined, I can
resend. Also, I fixed up the context on my end to be u64, but not sure
if that will match your tree (next doesn't have my prior patch applied
yet, that I can see).

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index f1c74c28e564..d5e635f2c3aa 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -2078,12 +2078,18 @@ static long pnv_pci_ioda2_setup_default_config(struct pnv_ioda_pe *pe)
 	struct iommu_table *tbl = NULL;
 	long rc;
 	/*
+	 * crashkernel= specifies the kdump kernel's maximum memory at
+	 * some offset and there is no guaranteed the result is a power
+	 * of 2, which will cause errors later.
+	 */
+	const u64 max_memory = __rounddown_pow_of_two(memory_hotplug_max());
+	/*
 	 * In memory constrained environments, e.g. kdump kernel, the
 	 * DMA window can be larger than available memory, which will
 	 * cause errors later.
 	 */
 	const u64 window_size =
-		min((u64)pe->table_group.tce32_size, memory_hotplug_max());
+		min((u64)pe->table_group.tce32_size, max_memory);
 
 	rc = pnv_pci_ioda2_create_table(&pe->table_group, 0,
 			iommu_page_shift_4k,