ntb: Add a module option to control affinity of DMA channels
The DMA channel(s)/memory used to transfer data to an NTB device
may not be required to be on the same node as the device. Add a
module parameter that allows any candidate channel (aside from
node assocation) and allocated memory to be used.
Signed-off-by: Gary R Hook <gary.hook@amd.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 42756a9..0ec9f56 100644
--- a/drivers/ntb/test/ntb_perf.c
+++ b/drivers/ntb/test/ntb_perf.c
@@ -101,6 +101,10 @@ static bool use_dma; /* default to 0 */
module_param(use_dma, bool, 0644);
MODULE_PARM_DESC(use_dma, "Using DMA engine to measure performance");
+static bool on_node = true; /* default to 1 */
+module_param(on_node, bool, 0644);
+MODULE_PARM_DESC(on_node, "Run threads only on NTB device node (default: true)");
+
struct perf_mw {
phys_addr_t phys_addr;
resource_size_t phys_size;
@@ -345,6 +349,10 @@ static int perf_move_data(struct pthr_ctx *pctx, char __iomem *dst, char *src,
static bool perf_dma_filter_fn(struct dma_chan *chan, void *node)
{
+ /* Is the channel required to be on the same node as the device? */
+ if (!on_node)
+ return true;
+
return dev_to_node(&chan->dev->device) == (int)(unsigned long)node;
}
@@ -362,7 +370,7 @@ static int ntb_perf_thread(void *data)
pr_debug("kthread %s starting...\n", current->comm);
- node = dev_to_node(&pdev->dev);
+ node = on_node ? dev_to_node(&pdev->dev) : NUMA_NO_NODE;
if (use_dma && !pctx->dma_chan) {
dma_cap_mask_t dma_mask;
@@ -682,7 +690,8 @@ static ssize_t debugfs_run_write(struct file *filp, const char __user *ubuf,
pr_info("Fix run_order to %u\n", run_order);
}
- node = dev_to_node(&perf->ntb->pdev->dev);
+ node = on_node ? dev_to_node(&perf->ntb->pdev->dev)
+ : NUMA_NO_NODE;
atomic_set(&perf->tdone, 0);
/* launch kernel thread */
@@ -779,8 +788,7 @@ static int perf_probe(struct ntb_client *client, struct ntb_dev *ntb)
if (ntb_peer_port_count(ntb) != NTB_DEF_PEER_CNT)
dev_warn(&ntb->dev, "Multi-port NTB devices unsupported\n");
- node = dev_to_node(&pdev->dev);
-
+ node = on_node ? dev_to_node(&pdev->dev) : NUMA_NO_NODE;
perf = kzalloc_node(sizeof(*perf), GFP_KERNEL, node);
if (!perf) {
rc = -ENOMEM;