Merge remote-tracking branches 'asoc/fix/db1200', 'asoc/fix/dwc', 'asoc/fix/imx-ssi...

[linux-beck.git] / arch / powerpc / platforms / powernv / pci-ioda.c

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 2927cd5c830309fed2b5d2a696b5a83767f0f444..414fd1a00fda85b243dcb2839a4929b09be4a52c 100644 (file)
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -2049,9 +2049,23 @@ 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, max_memory);
+
        rc = pnv_pci_ioda2_create_table(&pe->table_group, 0,
                        IOMMU_PAGE_SHIFT_4K,
-                       pe->table_group.tce32_size,
+                       window_size,
                        POWERNV_IOMMU_DEFAULT_LEVELS, &tbl);
        if (rc) {
                pe_err(pe, "Failed to create 32-bit TCE table, err %ld",