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authorJason Gunthorpe <jgunthorpe@obsidianresearch.com>2014-04-18 16:19:51 +0400
committerJason Cooper <jason@lakedaemon.net>2014-04-24 07:47:55 +0400
commit09752a12f430f58523fb6f435f5e30e4048fcfb2 (patch)
treebc4adfc62940cc8b809dfb6be008c7762d6d2c36 /drivers/bus/mvebu-mbus.c
parentb6d07e0273d3296cfbdc88145b8a00ddbefb310a (diff)
downloadlinux-09752a12f430f58523fb6f435f5e30e4048fcfb2.tar.xz
bus: mvebu-mbus: Avoid setting an undefined window size
The mbus hardware requires a power of two size, and size aligned base. Currently, if a non-power of two is passed in to the low level routines they configure the register in a way that results in undefined behaviour. Call WARN and return EINVAL instead. Also, update the debugfs routines to show a message if there is an invalid register setting. All together this makes the recent problems with silent failure of PCI very obvious, noisy and debuggable. Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Link: https://lkml.kernel.org/r/1397823593-1932-6-git-send-email-thomas.petazzoni@free-electrons.com Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Diffstat (limited to 'drivers/bus/mvebu-mbus.c')
-rw-r--r--drivers/bus/mvebu-mbus.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/bus/mvebu-mbus.c b/drivers/bus/mvebu-mbus.c
index 293e2e0a0a87..afee0f731111 100644
--- a/drivers/bus/mvebu-mbus.c
+++ b/drivers/bus/mvebu-mbus.c
@@ -56,6 +56,7 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/debugfs.h>
+#include <linux/log2.h>
/*
* DDR target is the same on all platforms.
@@ -266,6 +267,17 @@ static int mvebu_mbus_setup_window(struct mvebu_mbus_state *mbus,
mbus->soc->win_cfg_offset(win);
u32 ctrl, remap_addr;
+ if (!is_power_of_2(size)) {
+ WARN(true, "Invalid MBus window size: 0x%zx\n", size);
+ return -EINVAL;
+ }
+
+ if ((base & (phys_addr_t)(size - 1)) != 0) {
+ WARN(true, "Invalid MBus base/size: %pa len 0x%zx\n", &base,
+ size);
+ return -EINVAL;
+ }
+
ctrl = ((size - 1) & WIN_CTRL_SIZE_MASK) |
(attr << WIN_CTRL_ATTR_SHIFT) |
(target << WIN_CTRL_TGT_SHIFT) |
@@ -413,6 +425,10 @@ static int mvebu_devs_debug_show(struct seq_file *seq, void *v)
win, (unsigned long long)wbase,
(unsigned long long)(wbase + wsize), wtarget, wattr);
+ if (!is_power_of_2(wsize) ||
+ ((wbase & (u64)(wsize - 1)) != 0))
+ seq_puts(seq, " (Invalid base/size!!)");
+
if (win < mbus->soc->num_remappable_wins) {
seq_printf(seq, " (remap %016llx)\n",
(unsigned long long)wremap);