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authorGuennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>2019-05-24 19:09:23 (GMT)
committerMark Brown <broonie@kernel.org>2019-05-28 14:48:47 (GMT)
commit1183e9a634db06825da7faba566bce50afde4357 (patch)
treed7c016ba144feacc1c5602e165eb9f0a47c725df /sound
parent5661ad9490ee4abdb27295880e524acc656c89e7 (diff)
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ASoC: SOF: ipc: fix a race, leading to IPC timeouts
Currently on all supported platforms the IPC IRQ thread first signals the sender when an IPC response is received from the DSP, then unmasks the IPC interrupt. Those actions are performed without holding any locks, so the thread can be interrupted between them. IPC timeouts have been observed in such scenarios: if the sender is woken up and it proceeds with sending the next message without unmasking the IPC interrupt, it can miss the next response. This patch takes a spin-lock to prevent the IRQ thread from being preempted at that point. It also makes sure, that the next IPC transmission by the host cannot take place before the IRQ thread has finished updating all the required IPC registers. Fixes: 53e0c72d98b ("ASoC: SOF: Add support for IPC IO between DSP and Host") Reviewed-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/sof/intel/bdw.c9
-rw-r--r--sound/soc/sof/intel/byt.c10
-rw-r--r--sound/soc/sof/intel/cnl.c4
-rw-r--r--sound/soc/sof/intel/hda-ipc.c17
-rw-r--r--sound/soc/sof/ipc.c13
5 files changed, 27 insertions, 26 deletions
diff --git a/sound/soc/sof/intel/bdw.c b/sound/soc/sof/intel/bdw.c
index 065cb86..8ff3ee5 100644
--- a/sound/soc/sof/intel/bdw.c
+++ b/sound/soc/sof/intel/bdw.c
@@ -283,6 +283,8 @@ static irqreturn_t bdw_irq_thread(int irq, void *context)
SHIM_IMRX, SHIM_IMRX_DONE,
SHIM_IMRX_DONE);
+ spin_lock_irq(&sdev->ipc_lock);
+
/*
* handle immediate reply from DSP core. If the msg is
* found, set done bit in cmd_done which is called at the
@@ -294,6 +296,8 @@ static irqreturn_t bdw_irq_thread(int irq, void *context)
snd_sof_ipc_reply(sdev, ipcx);
bdw_dsp_done(sdev);
+
+ spin_unlock_irq(&sdev->ipc_lock);
}
ipcd = snd_sof_dsp_read(sdev, BDW_DSP_BAR, SHIM_IPCD);
@@ -485,7 +489,6 @@ static void bdw_get_reply(struct snd_sof_dev *sdev)
{
struct snd_sof_ipc_msg *msg = sdev->msg;
struct sof_ipc_reply reply;
- unsigned long flags;
int ret = 0;
/*
@@ -501,8 +504,6 @@ static void bdw_get_reply(struct snd_sof_dev *sdev)
/* get reply */
sof_mailbox_read(sdev, sdev->host_box.offset, &reply, sizeof(reply));
- spin_lock_irqsave(&sdev->ipc_lock, flags);
-
if (reply.error < 0) {
memcpy(msg->reply_data, &reply, sizeof(reply));
ret = reply.error;
@@ -521,8 +522,6 @@ static void bdw_get_reply(struct snd_sof_dev *sdev)
}
msg->reply_error = ret;
-
- spin_unlock_irqrestore(&sdev->ipc_lock, flags);
}
static void bdw_host_done(struct snd_sof_dev *sdev)
diff --git a/sound/soc/sof/intel/byt.c b/sound/soc/sof/intel/byt.c
index 7bf9143..9e4c07e 100644
--- a/sound/soc/sof/intel/byt.c
+++ b/sound/soc/sof/intel/byt.c
@@ -329,6 +329,9 @@ static irqreturn_t byt_irq_thread(int irq, void *context)
SHIM_IMRX,
SHIM_IMRX_DONE,
SHIM_IMRX_DONE);
+
+ spin_lock_irq(&sdev->ipc_lock);
+
/*
* handle immediate reply from DSP core. If the msg is
* found, set done bit in cmd_done which is called at the
@@ -340,6 +343,8 @@ static irqreturn_t byt_irq_thread(int irq, void *context)
snd_sof_ipc_reply(sdev, ipcx);
byt_dsp_done(sdev);
+
+ spin_unlock_irq(&sdev->ipc_lock);
}
/* new message from DSP */
@@ -383,7 +388,6 @@ static void byt_get_reply(struct snd_sof_dev *sdev)
{
struct snd_sof_ipc_msg *msg = sdev->msg;
struct sof_ipc_reply reply;
- unsigned long flags;
int ret = 0;
/*
@@ -399,8 +403,6 @@ static void byt_get_reply(struct snd_sof_dev *sdev)
/* get reply */
sof_mailbox_read(sdev, sdev->host_box.offset, &reply, sizeof(reply));
- spin_lock_irqsave(&sdev->ipc_lock, flags);
-
if (reply.error < 0) {
memcpy(msg->reply_data, &reply, sizeof(reply));
ret = reply.error;
@@ -419,8 +421,6 @@ static void byt_get_reply(struct snd_sof_dev *sdev)
}
msg->reply_error = ret;
-
- spin_unlock_irqrestore(&sdev->ipc_lock, flags);
}
static void byt_host_done(struct snd_sof_dev *sdev)
diff --git a/sound/soc/sof/intel/cnl.c b/sound/soc/sof/intel/cnl.c
index 08a1a3d..b2eba7a 100644
--- a/sound/soc/sof/intel/cnl.c
+++ b/sound/soc/sof/intel/cnl.c
@@ -64,6 +64,8 @@ static irqreturn_t cnl_ipc_irq_thread(int irq, void *context)
CNL_DSP_REG_HIPCCTL,
CNL_DSP_REG_HIPCCTL_DONE, 0);
+ spin_lock_irq(&sdev->ipc_lock);
+
/* handle immediate reply from DSP core */
hda_dsp_ipc_get_reply(sdev);
snd_sof_ipc_reply(sdev, msg);
@@ -75,6 +77,8 @@ static irqreturn_t cnl_ipc_irq_thread(int irq, void *context)
cnl_ipc_dsp_done(sdev);
+ spin_unlock_irq(&sdev->ipc_lock);
+
ret = IRQ_HANDLED;
}
diff --git a/sound/soc/sof/intel/hda-ipc.c b/sound/soc/sof/intel/hda-ipc.c
index 73ead70..51b2851 100644
--- a/sound/soc/sof/intel/hda-ipc.c
+++ b/sound/soc/sof/intel/hda-ipc.c
@@ -72,7 +72,6 @@ void hda_dsp_ipc_get_reply(struct snd_sof_dev *sdev)
struct snd_sof_ipc_msg *msg = sdev->msg;
struct sof_ipc_reply reply;
struct sof_ipc_cmd_hdr *hdr;
- unsigned long flags;
int ret = 0;
/*
@@ -84,7 +83,6 @@ void hda_dsp_ipc_get_reply(struct snd_sof_dev *sdev)
dev_warn(sdev->dev, "unexpected ipc interrupt raised!\n");
return;
}
- spin_lock_irqsave(&sdev->ipc_lock, flags);
hdr = msg->msg_data;
if (hdr->cmd == (SOF_IPC_GLB_PM_MSG | SOF_IPC_PM_CTX_SAVE)) {
@@ -123,7 +121,6 @@ void hda_dsp_ipc_get_reply(struct snd_sof_dev *sdev)
out:
msg->reply_error = ret;
- spin_unlock_irqrestore(&sdev->ipc_lock, flags);
}
static bool hda_dsp_ipc_is_sof(uint32_t msg)
@@ -172,6 +169,18 @@ irqreturn_t hda_dsp_ipc_irq_thread(int irq, void *context)
HDA_DSP_REG_HIPCCTL,
HDA_DSP_REG_HIPCCTL_DONE, 0);
+ /*
+ * Make sure the interrupt thread cannot be preempted between
+ * waking up the sender and re-enabling the interrupt. Also
+ * protect against a theoretical race with sof_ipc_tx_message():
+ * if the DSP is fast enough to receive an IPC message, reply to
+ * it, and the host interrupt processing calls this function on
+ * a different core from the one, where the sending is taking
+ * place, the message might not yet be marked as expecting a
+ * reply.
+ */
+ spin_lock_irq(&sdev->ipc_lock);
+
/* handle immediate reply from DSP core - ignore ROM messages */
if (hda_dsp_ipc_is_sof(msg)) {
hda_dsp_ipc_get_reply(sdev);
@@ -187,6 +196,8 @@ irqreturn_t hda_dsp_ipc_irq_thread(int irq, void *context)
/* set the done bit */
hda_dsp_ipc_dsp_done(sdev);
+ spin_unlock_irq(&sdev->ipc_lock);
+
ret = IRQ_HANDLED;
}
diff --git a/sound/soc/sof/ipc.c b/sound/soc/sof/ipc.c
index 894e68c..10304a9 100644
--- a/sound/soc/sof/ipc.c
+++ b/sound/soc/sof/ipc.c
@@ -308,19 +308,8 @@ EXPORT_SYMBOL(sof_ipc_tx_message);
int snd_sof_ipc_reply(struct snd_sof_dev *sdev, u32 msg_id)
{
struct snd_sof_ipc_msg *msg = &sdev->ipc->msg;
- unsigned long flags;
-
- /*
- * Protect against a theoretical race with sof_ipc_tx_message(): if the
- * DSP is fast enough to receive an IPC message, reply to it, and the
- * host interrupt processing calls this function on a different core
- * from the one, where the sending is taking place, the message might
- * not yet be marked as expecting a reply.
- */
- spin_lock_irqsave(&sdev->ipc_lock, flags);
if (msg->ipc_complete) {
- spin_unlock_irqrestore(&sdev->ipc_lock, flags);
dev_err(sdev->dev, "error: no reply expected, received 0x%x",
msg_id);
return -EINVAL;
@@ -330,8 +319,6 @@ int snd_sof_ipc_reply(struct snd_sof_dev *sdev, u32 msg_id)
msg->ipc_complete = true;
wake_up(&msg->waitq);
- spin_unlock_irqrestore(&sdev->ipc_lock, flags);
-
return 0;
}
EXPORT_SYMBOL(snd_sof_ipc_reply);