IB/ehca: Fix driver on relocatable kernel

the eHCA driver registers a MR for all of kernel memory, but makes the
assumption that valid memory exists at KERNELBASE.  This assumption
may not be true in the case of a relocatable kernel, so use KERNELBASE
+ PHYSICAL_START to get the true beginning of usable kernel memory.

cc: Joachim Fenkes <fenkes@de.ibm.com>
cc: Christoph Raisch <raisch@de.ibm.com>
cc: Hoan-Ham Hguyen <hnguyen@de.ibm.com>
Signed-off-by: Sonny Rao <sonnyrao@us.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/ehca/ehca_mrmw.c b/drivers/infiniband/hw/ehca/ehca_mrmw.c
index 53f4cd4..43cae84 100644 (file)
--- a/drivers/infiniband/hw/ehca/ehca_mrmw.c
+++ b/drivers/infiniband/hw/ehca/ehca_mrmw.c
@@ -171,7 +171,7 @@ struct ib_mr *ehca_get_dma_mr(struct ib_pd *pd, int mr_access_flags)
                }
 
                ret = ehca_reg_maxmr(shca, e_maxmr,
-                                    (void *)ehca_map_vaddr((void *)KERNELBASE),
+                                    (void *)ehca_map_vaddr((void *)(KERNELBASE + PHYSICAL_START)),
                                     mr_access_flags, e_pd,
                                     &e_maxmr->ib.ib_mr.lkey,
                                     &e_maxmr->ib.ib_mr.rkey);
@@ -1636,7 +1636,7 @@ int ehca_reg_internal_maxmr(
 
        /* register internal max-MR on HCA */
        size_maxmr = ehca_mr_len;
-       iova_start = (u64 *)ehca_map_vaddr((void *)KERNELBASE);
+       iova_start = (u64 *)ehca_map_vaddr((void *)(KERNELBASE + PHYSICAL_START));
        ib_pbuf.addr = 0;
        ib_pbuf.size = size_maxmr;
        num_kpages = NUM_CHUNKS(((u64)iova_start % PAGE_SIZE) + size_maxmr,
@@ -2209,7 +2209,7 @@ int ehca_mr_is_maxmr(u64 size,
 {
        /* a MR is treated as max-MR only if it fits following: */
        if ((size == ehca_mr_len) &&
-           (iova_start == (void *)ehca_map_vaddr((void *)KERNELBASE))) {
+           (iova_start == (void *)ehca_map_vaddr((void *)(KERNELBASE + PHYSICAL_START)))) {
                ehca_gen_dbg("this is a max-MR");
                return 1;
        } else