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 <log...@deltatee.com> Acked-by: Dave Jiang <dave.ji...@intel.com>
> --- > 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 >
