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dmaengine: pl330: introduce debugfs interface

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This patch adds debugfs interface to show the relationship between
DMA threads (hardware resource for transferring data) and DMA
channel ID of DMA slave.

Typically, PL330 has many slaves than number of DMA threads.
So sometimes PL330 cannot allocate DMA threads for all slaves even
if a user specify DMA channel ID in devicetree. This interface will
be useful for checking that DMA threads are allocated or not.

Below is an output sample:

$ sudo cat /sys/kernel/debug/ff1f0000.dmac
PL330 physical channels:
THREAD:         CHANNEL:
--------        -----
0               8
1               9
2               11
3               12
4               14
5               15
6               10
7               --

Signed-off-by: Katsuhiro Suzuki <katsuhiro@katsuster.net>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Katsuhiro Suzuki 2019-03-17 19:03:06 +09:00 committed by Vinod Koul
parent 74fca241e6
commit b45aef3aef
1 changed files with 51 additions and 0 deletions
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51
drivers/dma/pl330.c
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@ -11,6 +11,7 @@
* (at your option) any later version.
*/
#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/init.h>
@ -2896,6 +2897,55 @@ static irqreturn_t pl330_irq_handler(int irq, void *data)
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)
#ifdef CONFIG_DEBUG_FS
static int pl330_debugfs_show(struct seq_file *s, void *data)
{
struct pl330_dmac *pl330 = s->private;
int chans, pchs, ch, pr;
chans = pl330->pcfg.num_chan;
pchs = pl330->num_peripherals;
seq_puts(s, "PL330 physical channels:\n");
seq_puts(s, "THREAD:\t\tCHANNEL:\n");
seq_puts(s, "--------\t-----\n");
for (ch = 0; ch < chans; ch++) {
struct pl330_thread *thrd = &pl330->channels[ch];
int found = -1;
for (pr = 0; pr < pchs; pr++) {
struct dma_pl330_chan *pch = &pl330->peripherals[pr];
if (!pch->thread || thrd->id != pch->thread->id)
continue;
found = pr;
}
seq_printf(s, "%d\t\t", thrd->id);
if (found == -1)
seq_puts(s, "--\n");
else
seq_printf(s, "%d\n", found);
}
return 0;
}
DEFINE_SHOW_ATTRIBUTE(pl330_debugfs);
static inline void init_pl330_debugfs(struct pl330_dmac *pl330)
{
debugfs_create_file(dev_name(pl330->ddma.dev),
S_IFREG | 0444, NULL, pl330,
&pl330_debugfs_fops);
}
#else
static inline void init_pl330_debugfs(struct pl330_dmac *pl330)
{
}
#endif
/*
* Runtime PM callbacks are provided by amba/bus.c driver.
*
@ -3082,6 +3132,7 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
dev_err(&adev->dev, "unable to set the seg size\n");
init_pl330_debugfs(pl330);
dev_info(&adev->dev,
"Loaded driver for PL330 DMAC-%x\n", adev->periphid);
dev_info(&adev->dev,