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>
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 @@
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 @@
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);