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ntb_perf: Allow limiting the size of the memory windows

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On my system, dma_alloc_coherent won't produce memory anywhere
near the size of the BAR. So I needed a way to limit this.

It's pretty much copied straight from ntb_transport.

Signed-off-by: Logan Gunthorpe <[email protected]>
Acked-by: Dave Jiang <[email protected]>
Signed-off-by: Jon Mason <[email protected]>
This commit is contained in:
Logan Gunthorpe 2016-06-03 14:50:31 -06:00 • committed by Jon Mason
commit 4aae977721
1 changed files with 8 additions and 0 deletions
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8
drivers/ntb/test/ntb_perf.c
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@ -83,6 +83,10 @@ MODULE_DESCRIPTION(DRIVER_DESCRIPTION);
static struct dentry *perf_debugfs_dir;
static unsigned long max_mw_size;
module_param(max_mw_size, ulong, 0644);
MODULE_PARM_DESC(max_mw_size, "Limit size of large memory windows");
static unsigned int seg_order = 19; /* 512K */
module_param(seg_order, uint, 0644);
MODULE_PARM_DESC(seg_order, "size order [n^2] of buffer segment for testing");
@ -472,6 +476,10 @@ static void perf_link_work(struct work_struct *work)
dev_dbg(&perf->ntb->pdev->dev, "%s called\n", __func__);
size = perf->mw.phys_size;
if (max_mw_size && size > max_mw_size)
size = max_mw_size;
ntb_peer_spad_write(ndev, MW_SZ_HIGH, upper_32_bits(size));
ntb_peer_spad_write(ndev, MW_SZ_LOW, lower_32_bits(size));
ntb_peer_spad_write(ndev, VERSION, PERF_VERSION);