diff options
| author | Logan Gunthorpe <logang@deltatee.com> | 2016-06-03 22:50:31 +0200 |
|---|---|---|
| committer | Jon Mason <jdmason@kudzu.us> | 2016-08-05 16:21:06 +0200 |
| commit | 4aae977721f0367809cdc94584b6945073d9fe10 (patch) | |
| tree | 2ed434a025160326c1bfc04b61269ad867b5cc51 /drivers | |
| parent | NTB: allocate number transport entries depending on size of ring size (diff) | |
| download | linux-4aae977721f0367809cdc94584b6945073d9fe10.tar.xz linux-4aae977721f0367809cdc94584b6945073d9fe10.zip | |
ntb_perf: Allow limiting the size of the memory windows
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 <logang@deltatee.com>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/ntb/test/ntb_perf.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c index 8dfce9c9aad0..30635c89320c 100644 --- a/drivers/ntb/test/ntb_perf.c +++ b/drivers/ntb/test/ntb_perf.c @@ -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); |