From: Sonny Rao <sonnyrao@us•ibm.com>
To: linux-ppc@lists•ozlabs.org
Cc: linux-rdma@vger•kernel.org, fenkes@de•ibm.com, raisch@de•ibm.com
Subject: [PATCH 2/2]: Powerpc: Fix EHCA driver on relocatable kernel
Date: Thu, 19 Aug 2010 23:10:19 -0500 [thread overview]
Message-ID: <20100820041019.GT16505@us.ibm.com> (raw)
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.
This patch depends on the earlier patch which exports the necessary
symbol for PHYSICAL_START in a relocatable kernel.
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>
Index: linux-2.6/drivers/infiniband/hw/ehca/ehca_mrmw.c
===================================================================
--- linux-2.6.orig/drivers/infiniband/hw/ehca/ehca_mrmw.c 2010-08-09 22:16:57.688652613 -0500
+++ linux-2.6/drivers/infiniband/hw/ehca/ehca_mrmw.c 2010-08-19 22:53:03.451507146 -0500
@@ -171,7 +171,7 @@
}
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 @@
/* 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 @@
{
/* 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
reply other threads:[~2010-08-20 4:54 UTC|newest]
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