dma_terminate_all maybe called in interrupt context which means
WARN_ON() will be triggered as below when bd memory freed. Allocat
bd memory from dma pool instead.
[ 29.161079] WARNING: CPU: 1 PID: 533 at ./include/linux/dma-mapping.h:541 sdma_free_bd+0xa4/0xb4
[ 29.169883] Modules linked in:
[ 29.172990] CPU: 1 PID: 533 Comm: mpegaudioparse0 Not tainted 4.18.0-rc1-next-20180618-00009-gf79f22c #20
[ 29.182597] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[ 29.189163] Backtrace:
[ 29.191685] [<c010d1e0>] (dump_backtrace) from [<c010d4a0>] (show_stack+0x18/0x1c)
[ 29.199306] r7:00000000 r6:600f0093 r5:00000000 r4:c107db7c
[ 29.205029] [<c010d488>] (show_stack) from [<c0a5bba0>] (dump_stack+0xb4/0xe8)
[ 29.212312] [<c0a5baec>] (dump_stack) from [<c012703c>] (__warn+0x104/0x130)
[ 29.219411] r9:ec3e817c r8:0000021d r7:00000009 r6:c0d1d440 r5:00000000 r4:00000000
[ 29.227204] [<c0126f38>] (__warn) from [<c0127180>] (warn_slowpath_null+0x44/0x50)
[ 29.234821] r8:ed129dc4 r7:c0b01978 r6:c04d4e90 r5:0000021d r4:c0d1d440
[ 29.241574] [<c012713c>] (warn_slowpath_null) from [<c04d4e90>] (sdma_free_bd+0xa4/0xb4)
[ 29.249706] r6:4c001000 r5:f082e000 r4:00000024
[ 29.254376] [<c04d4dec>] (sdma_free_bd) from [<c04d4eb4>] (sdma_desc_free+0x14/0x20)
[ 29.262163] r7:ec3e8110 r6:00000100 r5:00000200 r4:ecf89a00
[ 29.267873] [<c04d4ea0>] (sdma_desc_free) from [<c04d229c>] (vchan_dma_desc_free_list+0xa4/0xac)
[ 29.276697] r5:00000200 r4:ed129d9c
[ 29.280326] [<c04d21f8>] (vchan_dma_desc_free_list) from [<c04d482c>] (sdma_disable_channel_with_delay+0x14c/0x188)
[ 29.290808] r9:ecae560c r8:ec3e815c r7:00000000 r6:c1008908 r5:ed129dc4 r4:ec3e8110
[ 29.298605] [<c04d46e0>] (sdma_disable_channel_with_delay) from [<c07c5c84>] (snd_dmaengine_pcm_trigger+0x90/0x1b0)
[ 29.309087] r8:ecae5000 r7:ec940800 r6:ed31bd80 r5:ecadb200 r4:ec26a700
[ 29.315855] [<c07c5bf4>] (snd_dmaengine_pcm_trigger) from [<c07dd800>] (soc_pcm_trigger+0xb4/0x130)
[ 29.324953] r8:ecae5000 r7:ec940800 r6:00000000 r5:ecadb200 r4:ec26a700
[ 29.331716] [<c07dd74c>] (soc_pcm_trigger) from [<c07bc008>] (snd_pcm_do_stop+0x58/0x5c)
[ 29.339859] r9:ecaed5a8 r8:ed31bdc0 r7:00000000 r6:00000001 r5:ecadb200 r4:c0b9c4d0
[ 29.347652] [<c07bbfb0>] (snd_pcm_do_stop) from [<c07bbde8>] (snd_pcm_action_single+0x40/0x80)
[ 29.356315] [<c07bbda8>] (snd_pcm_action_single) from [<c07bbf1c>] (snd_pcm_action+0xf4/0xfc)
[ 29.364883] r7:00000001 r6:c0b9c4d0 r5:ecadb2d4 r4:ecadb200
[ 29.370593] [<c07bbe28>] (snd_pcm_action) from [<c07bc8dc>] (snd_pcm_drop+0x58/0x9c)
Signed-off-by: Robin Gong <yibin.gong@xxxxxxx>
---
drivers/dma/imx-sdma.c | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index f8becaf..7dab7e9 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -24,6 +24,7 @@
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
#include <linux/firmware.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
@@ -343,6 +344,7 @@ struct sdma_channel {
u32 shp_addr, per_addr;
enum dma_status status;
struct imx_dma_data data;
+ struct dma_pool *bd_pool;
};
#define IMX_DMA_SG_LOOP BIT(0)
@@ -1153,11 +1155,10 @@ static int sdma_request_channel0(struct sdma_engine *sdma)
static int sdma_alloc_bd(struct sdma_desc *desc)
{
- u32 bd_size = desc->num_bd * sizeof(struct sdma_buffer_descriptor);
int ret = 0;
- desc->bd = dma_zalloc_coherent(NULL, bd_size, &desc->bd_phys,
- GFP_ATOMIC);
+ desc->bd = dma_pool_alloc(desc->sdmac->bd_pool, GFP_ATOMIC,
+ &desc->bd_phys);
if (!desc->bd) {
ret = -ENOMEM;
goto out;
@@ -1168,9 +1169,7 @@ static int sdma_alloc_bd(struct sdma_desc *desc)
static void sdma_free_bd(struct sdma_desc *desc)
{
- u32 bd_size = desc->num_bd * sizeof(struct sdma_buffer_descriptor);
-
- dma_free_coherent(NULL, bd_size, desc->bd, desc->bd_phys);
+ dma_pool_free(desc->sdmac->bd_pool, desc->bd, desc->bd_phys);
}
static void sdma_desc_free(struct virt_dma_desc *vd)
@@ -1218,6 +1217,10 @@ static int sdma_alloc_chan_resources(struct dma_chan *chan)
if (ret)
goto disable_clk_ahb;
+ sdmac->bd_pool = dma_pool_create("bd_pool", chan->device->dev,
+ sizeof(struct sdma_buffer_descriptor),
+ 32, 0);
+
return 0;
disable_clk_ahb:
@@ -1246,6 +1249,9 @@ static void sdma_free_chan_resources(struct dma_chan *chan)
clk_disable(sdma->clk_ipg);
clk_disable(sdma->clk_ahb);
+
+ dma_pool_destroy(sdmac->bd_pool);
+ sdmac->bd_pool = NULL;
}
static struct sdma_desc *sdma_transfer_init(struct sdma_channel *sdmac,
--
2.7.4
--
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