On Fri, Jun 3, 2016 at 5:03 PM, Jiang, Dave <[email protected]> wrote: > On Fri, 2016-06-03 at 14:50 -0600, Logan Gunthorpe wrote: >> 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]>
Applied to my ntb-next branch Thanks, Jon >> --- >> drivers/ntb/test/ntb_perf.c | 8 ++++++++ >> 1 file changed, 8 insertions(+) >> >> diff --git a/drivers/ntb/test/ntb_perf.c >> b/drivers/ntb/test/ntb_perf.c >> index 8dfce9c..30635c8 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); >> -- >> 2.1.4 >>
