diff options
| author |   Gary R Hook <gary.hook@amd.com> | 2017-05-09 09:33:17 -0500 |
|---|---|---|
| committer |   Jon Mason <jdmason@kudzu.us> | 2017-07-06 11:30:07 -0400 |
| commit | e9410ff810f330d41dd69aecdd46fd7d4bb9c983 (patch) | |
| tree | b88cfddffbf99d101e29f21386c7b4ac5f9a9a38 /drivers/ntb/test | |
| parent | NTB: Add IDT 89HPESxNTx PCIe-switches support (diff) | |
| download | linux-dev-e9410ff810f330d41dd69aecdd46fd7d4bb9c983.tar.xz linux-dev-e9410ff810f330d41dd69aecdd46fd7d4bb9c983.zip | |
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>
Diffstat (limited to 'drivers/ntb/test')
| -rw-r--r-- | drivers/ntb/test/ntb_perf.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c index 42756a98a728..0ec9f56f6999 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; |