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NTB: Improve index handling in B2B MW workaround

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Check that b2b_mw_idx is in range of the number of memory windows when
initializing the device.  The workaround is considered to be in effect
only if the device b2b_idx is exactly UINT_MAX, instead of any index
past the last memory window.

Only print B2B MW workaround information in debugfs if the workaround is
in effect.

Signed-off-by: Allen Hubbe <Allen.Hubbe@emc.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Allen Hubbe 2015-08-31 09:30:59 -04:00 committed by Jon Mason
parent 86663c9186
commit 2aa2a77a48
1 changed files with 16 additions and 6 deletions
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22
drivers/ntb/hw/intel/ntb_hw_intel.c
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@ -575,10 +575,13 @@ static ssize_t ndev_debugfs_read(struct file *filp, char __user *ubuf,
"Connection Topology -\t%s\n",
ntb_topo_string(ndev->ntb.topo));
off += scnprintf(buf + off, buf_size - off,
"B2B Offset -\t\t%#lx\n", ndev->b2b_off);
off += scnprintf(buf + off, buf_size - off,
"B2B MW Idx -\t\t%d\n", ndev->b2b_idx);
if (ndev->b2b_idx != UINT_MAX) {
off += scnprintf(buf + off, buf_size - off,
"B2B MW Idx -\t\t%u\n", ndev->b2b_idx);
off += scnprintf(buf + off, buf_size - off,
"B2B Offset -\t\t%#lx\n", ndev->b2b_off);
}
off += scnprintf(buf + off, buf_size - off,
"BAR4 Split -\t\t%s\n",
ndev->bar4_split ? "yes" : "no");
@ -1487,7 +1490,7 @@ static int xeon_setup_b2b_mw(struct intel_ntb_dev *ndev,
pdev = ndev_pdev(ndev);
mmio = ndev->self_mmio;
if (ndev->b2b_idx >= ndev->mw_count) {
if (ndev->b2b_idx == UINT_MAX) {
dev_dbg(ndev_dev(ndev), "not using b2b mw\n");
b2b_bar = 0;
ndev->b2b_off = 0;
@ -1779,6 +1782,13 @@ static int xeon_init_ntb(struct intel_ntb_dev *ndev)
else
ndev->b2b_idx = b2b_mw_idx;
if (ndev->b2b_idx >= ndev->mw_count) {
dev_dbg(ndev_dev(ndev),
"b2b_mw_idx %d invalid for mw_count %u\n",
b2b_mw_idx, ndev->mw_count);
return -EINVAL;
}
dev_dbg(ndev_dev(ndev),
"setting up b2b mw idx %d means %d\n",
b2b_mw_idx, ndev->b2b_idx);
@ -2008,7 +2018,7 @@ static inline void ndev_init_struct(struct intel_ntb_dev *ndev,
ndev->ntb.ops = &intel_ntb_ops;
ndev->b2b_off = 0;
ndev->b2b_idx = INT_MAX;
ndev->b2b_idx = UINT_MAX;
ndev->bar4_split = 0;