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| author | Jason Gunthorpe <jgunthorpe@obsidianresearch.com> | 2014-04-18 14:19:51 +0200 |
|---|---|---|
| committer | Jason Cooper <jason@lakedaemon.net> | 2014-04-24 03:47:55 +0000 |
| commit | 09752a12f430f58523fb6f435f5e30e4048fcfb2 (patch) | |
| tree | bc4adfc62940cc8b809dfb6be008c7762d6d2c36 /drivers/bus | |
| parent | b6d07e0273d3296cfbdc88145b8a00ddbefb310a (diff) | |
| download | op-kernel-dev-09752a12f430f58523fb6f435f5e30e4048fcfb2.zip op-kernel-dev-09752a12f430f58523fb6f435f5e30e4048fcfb2.tar.gz | |
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')
| -rw-r--r-- | drivers/bus/mvebu-mbus.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/bus/mvebu-mbus.c b/drivers/bus/mvebu-mbus.c index 293e2e0..afee0f7 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); |
