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authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>2015-07-08 16:28:19 +0200
committerVinod Koul <vinod.koul@intel.com>2015-08-19 22:32:14 +0530
commit777572911a732c0d3e6dbc514f9a1206606ffd0b (patch)
tree816a6957ab3eff8929166f4889879ed43538bba2 /drivers/dma
parent6d8f7abd235c1a38629cdada49cc53992f4ad42e (diff)
downloadlinux-777572911a732c0d3e6dbc514f9a1206606ffd0b.tar.bz2
dmaengine: mv_xor: optimize performance by using a subset of the XOR channels
Due to how async_tx behaves internally, having more XOR channels than CPUs is actually hurting performance more than it improves it, because memcpy requests get scheduled on a different channel than the XOR requests, but async_tx will still wait for the completion of the memcpy requests before scheduling the XOR requests. It is in fact more efficient to have at most one channel per CPU, which this patch implements by limiting the number of channels per engine, and the number of engines registered depending on the number of availables CPUs. Marvell platforms are currently available in one CPU, two CPUs and four CPUs configurations: - in the configurations with one CPU, only one channel from one engine is used. - in the configurations with two CPUs, only one channel from each engine is used (they are two XOR engines) - in the configurations with four CPUs, both channels of both engines are used. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/mv_xor.c24
1 files changed, 23 insertions, 1 deletions
diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c
index b165e0b31a48..a0e118725ae3 100644
--- a/drivers/dma/mv_xor.c
+++ b/drivers/dma/mv_xor.c
@@ -26,6 +26,7 @@
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/irqdomain.h>
+#include <linux/cpumask.h>
#include <linux/platform_data/dma-mv_xor.h>
#include "dmaengine.h"
@@ -1127,12 +1128,15 @@ static const struct of_device_id mv_xor_dt_ids[] = {
};
MODULE_DEVICE_TABLE(of, mv_xor_dt_ids);
+static unsigned int mv_xor_engine_count;
+
static int mv_xor_probe(struct platform_device *pdev)
{
const struct mbus_dram_target_info *dram;
struct mv_xor_device *xordev;
struct mv_xor_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct resource *res;
+ unsigned int max_engines, max_channels;
int i, ret;
int op_in_desc;
@@ -1176,6 +1180,21 @@ static int mv_xor_probe(struct platform_device *pdev)
if (!IS_ERR(xordev->clk))
clk_prepare_enable(xordev->clk);
+ /*
+ * We don't want to have more than one channel per CPU in
+ * order for async_tx to perform well. So we limit the number
+ * of engines and channels so that we take into account this
+ * constraint. Note that we also want to use channels from
+ * separate engines when possible.
+ */
+ max_engines = num_present_cpus();
+ max_channels = min_t(unsigned int,
+ MV_XOR_MAX_CHANNELS,
+ DIV_ROUND_UP(num_present_cpus(), 2));
+
+ if (mv_xor_engine_count >= max_engines)
+ return 0;
+
if (pdev->dev.of_node) {
struct device_node *np;
int i = 0;
@@ -1189,6 +1208,9 @@ static int mv_xor_probe(struct platform_device *pdev)
int irq;
op_in_desc = (int)of_id->data;
+ if (i >= max_channels)
+ continue;
+
dma_cap_zero(cap_mask);
dma_cap_set(DMA_MEMCPY, cap_mask);
dma_cap_set(DMA_XOR, cap_mask);
@@ -1212,7 +1234,7 @@ static int mv_xor_probe(struct platform_device *pdev)
i++;
}
} else if (pdata && pdata->channels) {
- for (i = 0; i < MV_XOR_MAX_CHANNELS; i++) {
+ for (i = 0; i < max_channels; i++) {
struct mv_xor_channel_data *cd;
struct mv_xor_chan *chan;
int irq;