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authorLinus Torvalds <torvalds@linux-foundation.org>2018-02-05 10:05:40 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-02-05 10:05:40 -0800
commit67fb3b92b0f92a161e25370d437ae4ba08089e75 (patch)
treeb48d6720d4af5e0282af9d1ecb404909515c7fc5 /drivers/rpmsg
parentae77c9583f424d8af0caf635a83dd0c267cb1052 (diff)
parentc3388a075c8ac568f892c40bec919ba8ac4077f0 (diff)
Merge tag 'rpmsg-v4.16' of git://github.com/andersson/remoteproc
Pull rpmsg updates from Bjorn Andersson: "This fixes a few issues found in the SMD and GLINK drivers and corrects the handling of SMD channels that are found in an (previously) unexpected state" * tag 'rpmsg-v4.16' of git://github.com/andersson/remoteproc: rpmsg: smd: Fix double unlock in __qcom_smd_send() rpmsg: glink: Fix missing mutex_init() in qcom_glink_alloc_channel() rpmsg: smd: Don't hold the tx lock during wait rpmsg: smd: Fail send on a closed channel rpmsg: smd: Wake up all waiters rpmsg: smd: Create device for all channels rpmsg: smd: Perform handshake during open rpmsg: glink: smem: Ensure ordering during tx drivers: rpmsg: remove duplicate includes remoteproc: qcom: Use PTR_ERR_OR_ZERO() in glink prob
Diffstat (limited to 'drivers/rpmsg')
-rw-r--r--drivers/rpmsg/qcom_glink_native.c1
-rw-r--r--drivers/rpmsg/qcom_glink_smem.c5
-rw-r--r--drivers/rpmsg/qcom_smd.c66
3 files changed, 54 insertions, 18 deletions
diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
index 40d76d2a5eff..e0f31ed096a5 100644
--- a/drivers/rpmsg/qcom_glink_native.c
+++ b/drivers/rpmsg/qcom_glink_native.c
@@ -221,6 +221,7 @@ static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink,
/* Setup glink internal glink_channel data */
spin_lock_init(&channel->recv_lock);
spin_lock_init(&channel->intent_lock);
+ mutex_init(&channel->intent_req_lock);
channel->glink = glink;
channel->name = kstrdup(name, GFP_KERNEL);
diff --git a/drivers/rpmsg/qcom_glink_smem.c b/drivers/rpmsg/qcom_glink_smem.c
index 5cdaa5f8fb61..892f2b92a4d8 100644
--- a/drivers/rpmsg/qcom_glink_smem.c
+++ b/drivers/rpmsg/qcom_glink_smem.c
@@ -29,8 +29,6 @@
#include <linux/workqueue.h>
#include <linux/list.h>
-#include <linux/delay.h>
-#include <linux/rpmsg.h>
#include <linux/rpmsg/qcom_glink.h>
#include "qcom_glink_native.h"
@@ -185,6 +183,9 @@ static void glink_smem_tx_write(struct qcom_glink_pipe *glink_pipe,
if (head >= pipe->native.length)
head -= pipe->native.length;
+ /* Ensure ordering of fifo and head update */
+ wmb();
+
*pipe->head = cpu_to_le32(head);
}
diff --git a/drivers/rpmsg/qcom_smd.c b/drivers/rpmsg/qcom_smd.c
index e540ca362d08..8428eba8cb73 100644
--- a/drivers/rpmsg/qcom_smd.c
+++ b/drivers/rpmsg/qcom_smd.c
@@ -200,6 +200,7 @@ struct qcom_smd_channel {
char *name;
enum smd_channel_state state;
enum smd_channel_state remote_state;
+ wait_queue_head_t state_change_event;
struct smd_channel_info_pair *info;
struct smd_channel_info_word_pair *info_word;
@@ -570,13 +571,15 @@ static bool qcom_smd_channel_intr(struct qcom_smd_channel *channel)
if (remote_state != channel->remote_state) {
channel->remote_state = remote_state;
need_state_scan = true;
+
+ wake_up_interruptible_all(&channel->state_change_event);
}
/* Indicate that we have seen any state change */
SET_RX_CHANNEL_FLAG(channel, fSTATE, 0);
/* Signal waiting qcom_smd_send() about the interrupt */
if (!GET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR))
- wake_up_interruptible(&channel->fblockread_event);
+ wake_up_interruptible_all(&channel->fblockread_event);
/* Don't consume any data until we've opened the channel */
if (channel->state != SMD_CHANNEL_OPENED)
@@ -740,28 +743,37 @@ static int __qcom_smd_send(struct qcom_smd_channel *channel, const void *data,
if (ret)
return ret;
- while (qcom_smd_get_tx_avail(channel) < tlen) {
+ while (qcom_smd_get_tx_avail(channel) < tlen &&
+ channel->state == SMD_CHANNEL_OPENED) {
if (!wait) {
ret = -EAGAIN;
- goto out;
- }
-
- if (channel->state != SMD_CHANNEL_OPENED) {
- ret = -EPIPE;
- goto out;
+ goto out_unlock;
}
SET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR, 0);
+ /* Wait without holding the tx_lock */
+ mutex_unlock(&channel->tx_lock);
+
ret = wait_event_interruptible(channel->fblockread_event,
qcom_smd_get_tx_avail(channel) >= tlen ||
channel->state != SMD_CHANNEL_OPENED);
if (ret)
- goto out;
+ return ret;
+
+ ret = mutex_lock_interruptible(&channel->tx_lock);
+ if (ret)
+ return ret;
SET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR, 1);
}
+ /* Fail if the channel was closed */
+ if (channel->state != SMD_CHANNEL_OPENED) {
+ ret = -EPIPE;
+ goto out_unlock;
+ }
+
SET_TX_CHANNEL_FLAG(channel, fTAIL, 0);
qcom_smd_write_fifo(channel, hdr, sizeof(hdr));
@@ -774,7 +786,7 @@ static int __qcom_smd_send(struct qcom_smd_channel *channel, const void *data,
qcom_smd_signal_channel(channel);
-out:
+out_unlock:
mutex_unlock(&channel->tx_lock);
return ret;
@@ -786,7 +798,9 @@ out:
static int qcom_smd_channel_open(struct qcom_smd_channel *channel,
rpmsg_rx_cb_t cb)
{
+ struct qcom_smd_edge *edge = channel->edge;
size_t bb_size;
+ int ret;
/*
* Packets are maximum 4k, but reduce if the fifo is smaller
@@ -798,9 +812,33 @@ static int qcom_smd_channel_open(struct qcom_smd_channel *channel,
qcom_smd_channel_set_callback(channel, cb);
qcom_smd_channel_set_state(channel, SMD_CHANNEL_OPENING);
+
+ /* Wait for remote to enter opening or opened */
+ ret = wait_event_interruptible_timeout(channel->state_change_event,
+ channel->remote_state == SMD_CHANNEL_OPENING ||
+ channel->remote_state == SMD_CHANNEL_OPENED,
+ HZ);
+ if (!ret) {
+ dev_err(&edge->dev, "remote side did not enter opening state\n");
+ goto out_close_timeout;
+ }
+
qcom_smd_channel_set_state(channel, SMD_CHANNEL_OPENED);
+ /* Wait for remote to enter opened */
+ ret = wait_event_interruptible_timeout(channel->state_change_event,
+ channel->remote_state == SMD_CHANNEL_OPENED,
+ HZ);
+ if (!ret) {
+ dev_err(&edge->dev, "remote side did not enter open state\n");
+ goto out_close_timeout;
+ }
+
return 0;
+
+out_close_timeout:
+ qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSED);
+ return -ETIMEDOUT;
}
/*
@@ -1055,6 +1093,7 @@ static struct qcom_smd_channel *qcom_smd_create_channel(struct qcom_smd_edge *ed
mutex_init(&channel->tx_lock);
spin_lock_init(&channel->recv_lock);
init_waitqueue_head(&channel->fblockread_event);
+ init_waitqueue_head(&channel->state_change_event);
info = qcom_smem_get(edge->remote_pid, smem_info_item, &info_size);
if (IS_ERR(info)) {
@@ -1161,7 +1200,7 @@ static void qcom_channel_scan_worker(struct work_struct *work)
dev_dbg(&edge->dev, "new channel found: '%s'\n", channel->name);
set_bit(i, edge->allocated[tbl]);
- wake_up_interruptible(&edge->new_channel_event);
+ wake_up_interruptible_all(&edge->new_channel_event);
}
}
@@ -1195,11 +1234,6 @@ static void qcom_channel_state_worker(struct work_struct *work)
if (channel->state != SMD_CHANNEL_CLOSED)
continue;
- remote_state = GET_RX_CHANNEL_INFO(channel, state);
- if (remote_state != SMD_CHANNEL_OPENING &&
- remote_state != SMD_CHANNEL_OPENED)
- continue;
-
if (channel->registered)
continue;

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