Linux-libre 4.7.1-gnupck-4.7.1-gnu

5 files changed, 203 insertions, 74 deletions

diff --git a/drivers/soc/qcom/smd-rpm.c b/drivers/soc/qcom/smd-rpm.c
index 731fa066f..6609d7e0e 100644
--- a/drivers/soc/qcom/smd-rpm.c
+++ b/drivers/soc/qcom/smd-rpm.c
@@ -33,6 +33,7 @@
  */
 struct qcom_smd_rpm {
 	struct qcom_smd_channel *rpm_channel;
+	struct device *dev;
 
 	struct completion ack;
 	struct mutex lock;
@@ -149,14 +150,14 @@ out:
 }
 EXPORT_SYMBOL(qcom_rpm_smd_write);
 
-static int qcom_smd_rpm_callback(struct qcom_smd_device *qsdev,
+static int qcom_smd_rpm_callback(struct qcom_smd_channel *channel,
 				 const void *data,
 				 size_t count)
 {
 	const struct qcom_rpm_header *hdr = data;
 	size_t hdr_length = le32_to_cpu(hdr->length);
 	const struct qcom_rpm_message *msg;
-	struct qcom_smd_rpm *rpm = dev_get_drvdata(&qsdev->dev);
+	struct qcom_smd_rpm *rpm = qcom_smd_get_drvdata(channel);
 	const u8 *buf = data + sizeof(struct qcom_rpm_header);
 	const u8 *end = buf + hdr_length;
 	char msgbuf[32];
@@ -165,7 +166,7 @@ static int qcom_smd_rpm_callback(struct qcom_smd_device *qsdev,
 
 	if (le32_to_cpu(hdr->service_type) != RPM_SERVICE_TYPE_REQUEST ||
 	    hdr_length < sizeof(struct qcom_rpm_message)) {
-		dev_err(&qsdev->dev, "invalid request\n");
+		dev_err(rpm->dev, "invalid request\n");
 		return 0;
 	}
 
@@ -206,7 +207,9 @@ static int qcom_smd_rpm_probe(struct qcom_smd_device *sdev)
 	mutex_init(&rpm->lock);
 	init_completion(&rpm->ack);
 
+	rpm->dev = &sdev->dev;
 	rpm->rpm_channel = sdev->channel;
+	qcom_smd_set_drvdata(sdev->channel, rpm);
 
 	dev_set_drvdata(&sdev->dev, rpm);
 
diff --git a/drivers/soc/qcom/smd.c b/drivers/soc/qcom/smd.c
index 498fd0581..ac1957dfd 100644
--- a/drivers/soc/qcom/smd.c
+++ b/drivers/soc/qcom/smd.c
@@ -106,9 +106,9 @@ static const struct {
  * @channels:		list of all channels detected on this edge
  * @channels_lock:	guard for modifications of @channels
  * @allocated:		array of bitmaps representing already allocated channels
- * @need_rescan:	flag that the @work needs to scan smem for new channels
  * @smem_available:	last available amount of smem triggering a channel scan
- * @work:		work item for edge house keeping
+ * @scan_work:		work item for discovering new channels
+ * @state_work:		work item for edge state changes
  */
 struct qcom_smd_edge {
 	struct qcom_smd *smd;
@@ -127,10 +127,12 @@ struct qcom_smd_edge {
 
 	DECLARE_BITMAP(allocated[SMD_ALLOC_TBL_COUNT], SMD_ALLOC_TBL_SIZE);
 
-	bool need_rescan;
 	unsigned smem_available;
 
-	struct work_struct work;
+	wait_queue_head_t new_channel_event;
+
+	struct work_struct scan_work;
+	struct work_struct state_work;
 };
 
 /*
@@ -186,13 +188,16 @@ struct qcom_smd_channel {
 	int fifo_size;
 
 	void *bounce_buffer;
-	int (*cb)(struct qcom_smd_device *, const void *, size_t);
+	qcom_smd_cb_t cb;
 
 	spinlock_t recv_lock;
 
 	int pkt_size;
 
+	void *drvdata;
+
 	struct list_head list;
+	struct list_head dev_list;
 };
 
 /**
@@ -378,6 +383,19 @@ static void qcom_smd_channel_reset(struct qcom_smd_channel *channel)
 }
 
 /*
+ * Set the callback for a channel, with appropriate locking
+ */
+static void qcom_smd_channel_set_callback(struct qcom_smd_channel *channel,
+					  qcom_smd_cb_t cb)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&channel->recv_lock, flags);
+	channel->cb = cb;
+	spin_unlock_irqrestore(&channel->recv_lock, flags);
+};
+
+/*
  * Calculate the amount of data available in the rx fifo
  */
 static size_t qcom_smd_channel_get_rx_avail(struct qcom_smd_channel *channel)
@@ -497,7 +515,6 @@ static void qcom_smd_channel_advance(struct qcom_smd_channel *channel,
  */
 static int qcom_smd_channel_recv_single(struct qcom_smd_channel *channel)
 {
-	struct qcom_smd_device *qsdev = channel->qsdev;
 	unsigned tail;
 	size_t len;
 	void *ptr;
@@ -517,7 +534,7 @@ static int qcom_smd_channel_recv_single(struct qcom_smd_channel *channel)
 		len = channel->pkt_size;
 	}
 
-	ret = channel->cb(qsdev, ptr, len);
+	ret = channel->cb(channel, ptr, len);
 	if (ret < 0)
 		return ret;
 
@@ -601,7 +618,8 @@ static irqreturn_t qcom_smd_edge_intr(int irq, void *data)
 	struct qcom_smd_edge *edge = data;
 	struct qcom_smd_channel *channel;
 	unsigned available;
-	bool kick_worker = false;
+	bool kick_scanner = false;
+	bool kick_state = false;
 
 	/*
 	 * Handle state changes or data on each of the channels on this edge
@@ -609,7 +627,7 @@ static irqreturn_t qcom_smd_edge_intr(int irq, void *data)
 	spin_lock(&edge->channels_lock);
 	list_for_each_entry(channel, &edge->channels, list) {
 		spin_lock(&channel->recv_lock);
-		kick_worker |= qcom_smd_channel_intr(channel);
+		kick_state |= qcom_smd_channel_intr(channel);
 		spin_unlock(&channel->recv_lock);
 	}
 	spin_unlock(&edge->channels_lock);
@@ -622,12 +640,13 @@ static irqreturn_t qcom_smd_edge_intr(int irq, void *data)
 	available = qcom_smem_get_free_space(edge->remote_pid);
 	if (available != edge->smem_available) {
 		edge->smem_available = available;
-		edge->need_rescan = true;
-		kick_worker = true;
+		kick_scanner = true;
 	}
 
-	if (kick_worker)
-		schedule_work(&edge->work);
+	if (kick_scanner)
+		schedule_work(&edge->scan_work);
+	if (kick_state)
+		schedule_work(&edge->state_work);
 
 	return IRQ_HANDLED;
 }
@@ -793,18 +812,12 @@ static int qcom_smd_dev_match(struct device *dev, struct device_driver *drv)
 }
 
 /*
- * Probe the smd client.
- *
- * The remote side have indicated that it want the channel to be opened, so
- * complete the state handshake and probe our client driver.
+ * Helper for opening a channel
  */
-static int qcom_smd_dev_probe(struct device *dev)
+static int qcom_smd_channel_open(struct qcom_smd_channel *channel,
+				 qcom_smd_cb_t cb)
 {
-	struct qcom_smd_device *qsdev = to_smd_device(dev);
-	struct qcom_smd_driver *qsdrv = to_smd_driver(dev);
-	struct qcom_smd_channel *channel = qsdev->channel;
 	size_t bb_size;
-	int ret;
 
 	/*
 	 * Packets are maximum 4k, but reduce if the fifo is smaller
@@ -814,12 +827,44 @@ static int qcom_smd_dev_probe(struct device *dev)
 	if (!channel->bounce_buffer)
 		return -ENOMEM;
 
-	channel->cb = qsdrv->callback;
-
+	qcom_smd_channel_set_callback(channel, cb);
 	qcom_smd_channel_set_state(channel, SMD_CHANNEL_OPENING);
-
 	qcom_smd_channel_set_state(channel, SMD_CHANNEL_OPENED);
 
+	return 0;
+}
+
+/*
+ * Helper for closing and resetting a channel
+ */
+static void qcom_smd_channel_close(struct qcom_smd_channel *channel)
+{
+	qcom_smd_channel_set_callback(channel, NULL);
+
+	kfree(channel->bounce_buffer);
+	channel->bounce_buffer = NULL;
+
+	qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSED);
+	qcom_smd_channel_reset(channel);
+}
+
+/*
+ * Probe the smd client.
+ *
+ * The remote side have indicated that it want the channel to be opened, so
+ * complete the state handshake and probe our client driver.
+ */
+static int qcom_smd_dev_probe(struct device *dev)
+{
+	struct qcom_smd_device *qsdev = to_smd_device(dev);
+	struct qcom_smd_driver *qsdrv = to_smd_driver(dev);
+	struct qcom_smd_channel *channel = qsdev->channel;
+	int ret;
+
+	ret = qcom_smd_channel_open(channel, qsdrv->callback);
+	if (ret)
+		return ret;
+
 	ret = qsdrv->probe(qsdev);
 	if (ret)
 		goto err;
@@ -831,11 +876,7 @@ static int qcom_smd_dev_probe(struct device *dev)
 err:
 	dev_err(&qsdev->dev, "probe failed\n");
 
-	channel->cb = NULL;
-	kfree(channel->bounce_buffer);
-	channel->bounce_buffer = NULL;
-
-	qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSED);
+	qcom_smd_channel_close(channel);
 	return ret;
 }
 
@@ -850,16 +891,15 @@ static int qcom_smd_dev_remove(struct device *dev)
 	struct qcom_smd_device *qsdev = to_smd_device(dev);
 	struct qcom_smd_driver *qsdrv = to_smd_driver(dev);
 	struct qcom_smd_channel *channel = qsdev->channel;
-	unsigned long flags;
+	struct qcom_smd_channel *tmp;
+	struct qcom_smd_channel *ch;
 
 	qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSING);
 
 	/*
 	 * Make sure we don't race with the code receiving data.
 	 */
-	spin_lock_irqsave(&channel->recv_lock, flags);
-	channel->cb = NULL;
-	spin_unlock_irqrestore(&channel->recv_lock, flags);
+	qcom_smd_channel_set_callback(channel, NULL);
 
 	/* Wake up any sleepers in qcom_smd_send() */
 	wake_up_interruptible(&channel->fblockread_event);
@@ -872,15 +912,14 @@ static int qcom_smd_dev_remove(struct device *dev)
 		qsdrv->remove(qsdev);
 
 	/*
-	 * The client is now gone, cleanup and reset the channel state.
+	 * The client is now gone, close and release all channels associated
+	 * with this sdev
 	 */
-	channel->qsdev = NULL;
-	kfree(channel->bounce_buffer);
-	channel->bounce_buffer = NULL;
-
-	qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSED);
-
-	qcom_smd_channel_reset(channel);
+	list_for_each_entry_safe(ch, tmp, &channel->dev_list, dev_list) {
+		qcom_smd_channel_close(ch);
+		list_del(&ch->dev_list);
+		ch->qsdev = NULL;
+	}
 
 	return 0;
 }
@@ -996,6 +1035,18 @@ int qcom_smd_driver_register(struct qcom_smd_driver *qsdrv)
 }
 EXPORT_SYMBOL(qcom_smd_driver_register);
 
+void *qcom_smd_get_drvdata(struct qcom_smd_channel *channel)
+{
+	return channel->drvdata;
+}
+EXPORT_SYMBOL(qcom_smd_get_drvdata);
+
+void qcom_smd_set_drvdata(struct qcom_smd_channel *channel, void *data)
+{
+	channel->drvdata = data;
+}
+EXPORT_SYMBOL(qcom_smd_set_drvdata);
+
 /**
  * qcom_smd_driver_unregister - unregister a smd driver
  * @qsdrv:	qcom_smd_driver struct
@@ -1006,6 +1057,78 @@ void qcom_smd_driver_unregister(struct qcom_smd_driver *qsdrv)
 }
 EXPORT_SYMBOL(qcom_smd_driver_unregister);
 
+static struct qcom_smd_channel *
+qcom_smd_find_channel(struct qcom_smd_edge *edge, const char *name)
+{
+	struct qcom_smd_channel *channel;
+	struct qcom_smd_channel *ret = NULL;
+	unsigned long flags;
+	unsigned state;
+
+	spin_lock_irqsave(&edge->channels_lock, flags);
+	list_for_each_entry(channel, &edge->channels, list) {
+		if (strcmp(channel->name, name))
+			continue;
+
+		state = GET_RX_CHANNEL_INFO(channel, state);
+		if (state != SMD_CHANNEL_OPENING &&
+		    state != SMD_CHANNEL_OPENED)
+			continue;
+
+		ret = channel;
+		break;
+	}
+	spin_unlock_irqrestore(&edge->channels_lock, flags);
+
+	return ret;
+}
+
+/**
+ * qcom_smd_open_channel() - claim additional channels on the same edge
+ * @sdev:	smd_device handle
+ * @name:	channel name
+ * @cb:		callback method to use for incoming data
+ *
+ * Returns a channel handle on success, or -EPROBE_DEFER if the channel isn't
+ * ready.
+ */
+struct qcom_smd_channel *qcom_smd_open_channel(struct qcom_smd_channel *parent,
+					       const char *name,
+					       qcom_smd_cb_t cb)
+{
+	struct qcom_smd_channel *channel;
+	struct qcom_smd_device *sdev = parent->qsdev;
+	struct qcom_smd_edge *edge = parent->edge;
+	int ret;
+
+	/* Wait up to HZ for the channel to appear */
+	ret = wait_event_interruptible_timeout(edge->new_channel_event,
+			(channel = qcom_smd_find_channel(edge, name)) != NULL,
+			HZ);
+	if (!ret)
+		return ERR_PTR(-ETIMEDOUT);
+
+	if (channel->state != SMD_CHANNEL_CLOSED) {
+		dev_err(&sdev->dev, "channel %s is busy\n", channel->name);
+		return ERR_PTR(-EBUSY);
+	}
+
+	channel->qsdev = sdev;
+	ret = qcom_smd_channel_open(channel, cb);
+	if (ret) {
+		channel->qsdev = NULL;
+		return ERR_PTR(ret);
+	}
+
+	/*
+	 * Append the list of channel to the channels associated with the sdev
+	 */
+	list_add_tail(&channel->dev_list, &sdev->channel->dev_list);
+
+	return channel;
+}
+EXPORT_SYMBOL(qcom_smd_open_channel);
+
 /*
  * Allocate the qcom_smd_channel object for a newly found smd channel,
  * retrieving and validating the smem items involved.
@@ -1027,6 +1150,7 @@ static struct qcom_smd_channel *qcom_smd_create_channel(struct qcom_smd_edge *ed
 	if (!channel)
 		return ERR_PTR(-ENOMEM);
 
+	INIT_LIST_HEAD(&channel->dev_list);
 	channel->edge = edge;
 	channel->name = devm_kstrdup(smd->dev, name, GFP_KERNEL);
 	if (!channel->name)
@@ -1089,8 +1213,9 @@ free_name_and_channel:
  * qcom_smd_create_channel() to create representations of these and add
  * them to the edge's list of channels.
  */
-static void qcom_discover_channels(struct qcom_smd_edge *edge)
+static void qcom_channel_scan_worker(struct work_struct *work)
 {
+	struct qcom_smd_edge *edge = container_of(work, struct qcom_smd_edge, scan_work);
 	struct qcom_smd_alloc_entry *alloc_tbl;
 	struct qcom_smd_alloc_entry *entry;
 	struct qcom_smd_channel *channel;
@@ -1140,10 +1265,12 @@ static void qcom_discover_channels(struct qcom_smd_edge *edge)
 
 			dev_dbg(smd->dev, "new channel found: '%s'\n", channel->name);
 			set_bit(i, edge->allocated[tbl]);
+
+			wake_up_interruptible(&edge->new_channel_event);
 		}
 	}
 
-	schedule_work(&edge->work);
+	schedule_work(&edge->state_work);
 }
 
 /*
@@ -1151,29 +1278,23 @@ static void qcom_discover_channels(struct qcom_smd_edge *edge)
  * then scans all registered channels for state changes that should be handled
  * by creating or destroying smd client devices for the registered channels.
  *
- * LOCKING: edge->channels_lock is not needed to be held during the traversal
- * of the channels list as it's done synchronously with the only writer.
+ * LOCKING: edge->channels_lock only needs to cover the list operations, as the
+ * worker is killed before any channels are deallocated
  */
 static void qcom_channel_state_worker(struct work_struct *work)
 {
 	struct qcom_smd_channel *channel;
 	struct qcom_smd_edge *edge = container_of(work,
 						  struct qcom_smd_edge,
-						  work);
+						  state_work);
 	unsigned remote_state;
-
-	/*
-	 * Rescan smem if we have reason to belive that there are new channels.
-	 */
-	if (edge->need_rescan) {
-		edge->need_rescan = false;
-		qcom_discover_channels(edge);
-	}
+	unsigned long flags;
 
 	/*
 	 * Register a device for any closed channel where the remote processor
 	 * is showing interest in opening the channel.
 	 */
+	spin_lock_irqsave(&edge->channels_lock, flags);
 	list_for_each_entry(channel, &edge->channels, list) {
 		if (channel->state != SMD_CHANNEL_CLOSED)
 			continue;
@@ -1183,7 +1304,9 @@ static void qcom_channel_state_worker(struct work_struct *work)
 		    remote_state != SMD_CHANNEL_OPENED)
 			continue;
 
+		spin_unlock_irqrestore(&edge->channels_lock, flags);
 		qcom_smd_create_device(channel);
+		spin_lock_irqsave(&edge->channels_lock, flags);
 	}
 
 	/*
@@ -1200,8 +1323,11 @@ static void qcom_channel_state_worker(struct work_struct *work)
 		    remote_state == SMD_CHANNEL_OPENED)
 			continue;
 
+		spin_unlock_irqrestore(&edge->channels_lock, flags);
 		qcom_smd_destroy_device(channel);
+		spin_lock_irqsave(&edge->channels_lock, flags);
 	}
+	spin_unlock_irqrestore(&edge->channels_lock, flags);
 }
 
 /*
@@ -1219,7 +1345,8 @@ static int qcom_smd_parse_edge(struct device *dev,
 	INIT_LIST_HEAD(&edge->channels);
 	spin_lock_init(&edge->channels_lock);
 
-	INIT_WORK(&edge->work, qcom_channel_state_worker);
+	INIT_WORK(&edge->scan_work, qcom_channel_scan_worker);
+	INIT_WORK(&edge->state_work, qcom_channel_state_worker);
 
 	edge->of_node = of_node_get(node);
 
@@ -1303,13 +1430,13 @@ static int qcom_smd_probe(struct platform_device *pdev)
 	for_each_available_child_of_node(pdev->dev.of_node, node) {
 		edge = &smd->edges[i++];
 		edge->smd = smd;
+		init_waitqueue_head(&edge->new_channel_event);
 
 		ret = qcom_smd_parse_edge(&pdev->dev, node, edge);
 		if (ret)
 			continue;
 
-		edge->need_rescan = true;
-		schedule_work(&edge->work);
+		schedule_work(&edge->scan_work);
 	}
 
 	platform_set_drvdata(pdev, smd);
@@ -1332,8 +1459,10 @@ static int qcom_smd_remove(struct platform_device *pdev)
 		edge = &smd->edges[i];
 
 		disable_irq(edge->irq);
-		cancel_work_sync(&edge->work);
+		cancel_work_sync(&edge->scan_work);
+		cancel_work_sync(&edge->state_work);
 
+		/* No need to lock here, because the writer is gone */
 		list_for_each_entry(channel, &edge->channels, list) {
 			if (!channel->qsdev)
 				continue;
diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
index 19019aa09..2e1aa9f13 100644
--- a/drivers/soc/qcom/smem.c
+++ b/drivers/soc/qcom/smem.c
@@ -684,8 +684,7 @@ static int qcom_smem_map_memory(struct qcom_smem *smem, struct device *dev,
 
 	smem->regions[i].aux_base = (u32)r.start;
 	smem->regions[i].size = resource_size(&r);
-	smem->regions[i].virt_base = devm_ioremap_nocache(dev, r.start,
-							  resource_size(&r));
+	smem->regions[i].virt_base = devm_ioremap_wc(dev, r.start, resource_size(&r));
 	if (!smem->regions[i].virt_base)
 		return -ENOMEM;
 
diff --git a/drivers/soc/qcom/spm.c b/drivers/soc/qcom/spm.c
index 5548a31e1..f9d7a85b2 100644
--- a/drivers/soc/qcom/spm.c
+++ b/drivers/soc/qcom/spm.c
@@ -2,6 +2,8 @@
  * Copyright (c) 2011-2014, The Linux Foundation. All rights reserved.
  * Copyright (c) 2014,2015, Linaro Ltd.
  *
+ * SAW power controller driver
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
@@ -12,7 +14,6 @@
  * GNU General Public License for more details.
  */
 
-#include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/io.h>
@@ -274,7 +275,7 @@ check_spm:
 	return per_cpu(cpu_spm_drv, cpu) ? 0 : -ENXIO;
 }
 
-static struct cpuidle_ops qcom_cpuidle_ops __initdata = {
+static const struct cpuidle_ops qcom_cpuidle_ops __initconst = {
 	.suspend = qcom_idle_enter,
 	.init = qcom_cpuidle_init,
 };
@@ -378,8 +379,5 @@ static struct platform_driver spm_driver = {
 		.of_match_table = spm_match_table,
 	},
 };
-module_platform_driver(spm_driver);
 
-MODULE_LICENSE("GPL v2");
-MODULE_DESCRIPTION("SAW power controller driver");
-MODULE_ALIAS("platform:saw");
+builtin_platform_driver(spm_driver);
diff --git a/drivers/soc/qcom/wcnss_ctrl.c b/drivers/soc/qcom/wcnss_ctrl.c
index 4ca82a270..f633dcc96 100644
--- a/drivers/soc/qcom/wcnss_ctrl.c
+++ b/drivers/soc/qcom/wcnss_ctrl.c
@@ -100,17 +100,17 @@ struct wcnss_download_nv_resp {
 
 /**
  * wcnss_ctrl_smd_callback() - handler from SMD responses
- * @qsdev:	smd device handle
+ * @channel:	smd channel handle
  * @data:	pointer to the incoming data packet
  * @count:	size of the incoming data packet
  *
  * Handles any incoming packets from the remote WCNSS_CTRL service.
  */
-static int wcnss_ctrl_smd_callback(struct qcom_smd_device *qsdev,
+static int wcnss_ctrl_smd_callback(struct qcom_smd_channel *channel,
 				   const void *data,
 				   size_t count)
 {
-	struct wcnss_ctrl *wcnss = dev_get_drvdata(&qsdev->dev);
+	struct wcnss_ctrl *wcnss = qcom_smd_get_drvdata(channel);
 	const struct wcnss_download_nv_resp *nvresp;
 	const struct wcnss_version_resp *version;
 	const struct wcnss_msg_hdr *hdr = data;
@@ -246,7 +246,7 @@ static int wcnss_ctrl_probe(struct qcom_smd_device *sdev)
 	init_completion(&wcnss->ack);
 	INIT_WORK(&wcnss->download_nv_work, wcnss_download_nv);
 
-	dev_set_drvdata(&sdev->dev, wcnss);
+	qcom_smd_set_drvdata(sdev->channel, wcnss);
 
 	return wcnss_request_version(wcnss);
 }