Merge tag 'char-misc-7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull misc driver updates from Greg KH:
 "Here is the big set of char, misc, iio, fpga, and other small driver
  subsystems changes for 7.2-rc1.

  Lots of little stuff in here, the majority being of course the IIO
  driver updates, as a list they are:

   - IIO driver updates and additions

   - GPIB driver bugfixes and cleanups

   - Android binder driver updates (rust and C version)

   - counter driver updates

   - MHI driver updates

   - mei driver updates

   - w1 driver updates

   - interconnect driver updates

   - Comedi driver fixes and updates

   - some obsolete char drivers removed (applicom and dtlk)

   - hwtracing driver updates

   - other tiny driver updates

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'char-misc-7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (406 commits)
  w1: ds2482: Use named initializers for arrays of i2c_device_data
  firmware: stratix10-svc: Add support to query Arm Trusted Firmware (ATF) version
  firmware: stratix10-rsu: avoid blocking reboot_image sysfs when busy
  coresight: ultrasoc-smb: Fix OOB write in smb_sync_perf_buffer()
  iio: adc: nxp-sar-adc: harden buffer ISR against per-channel read failure
  iio: chemical: scd30: Replace manual locking with RAII locking
  iio: light: tsl2591: remove unneeded tsl2591_compatible_als_persist_cycle()
  iio: dac: ad5686: create bus ops struct
  iio: dac: ad5686: cleanup doc header of local structs
  iio: dac: ad5686: add control_sync() for single-channel devices
  iio: dac: ad5686: add helpers to handle powerdown masks
  iio: dac: ad5686: add of_match table to the spi driver
  iio: dac: ad5686: drop enum id
  iio: dac: ad5686: remove redundant register definition
  iio: dac: ad5686: refactor include headers
  iio: adc: ad4080: fix AD4880 chip ID
  iio: light: veml3328: add support for new device
  dt-bindings: iio: light: veml6030: add veml3328
  fpga: microchip-spi: fix zero header_size OOB read in mpf_ops_parse_header()
  fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region()
  ...

2 files changed, 124 insertions, 59 deletions

diff --git a/drivers/firmware/stratix10-rsu.c b/drivers/firmware/stratix10-rsu.c
index 2a7a0f774389..daddb5224794 100644
--- a/drivers/firmware/stratix10-rsu.c
+++ b/drivers/firmware/stratix10-rsu.c
@@ -244,27 +244,26 @@ static void rsu_async_get_spt_table_callback(struct device *dev,
 }
 
 /**
- * rsu_send_msg() - send a message to Intel service layer
+ * __rsu_send_msg_locked() - send a message to Intel service layer
  * @priv: pointer to rsu private data
  * @command: RSU status or update command
  * @arg: the request argument, the bitstream address or notify status
  * @callback: function pointer for the callback (status or update)
  *
- * Start an Intel service layer transaction to perform the SMC call that
- * is necessary to get RSU boot log or set the address of bitstream to
- * boot after reboot.
+ * Perform the actual SMC transaction. The caller must hold @priv->lock.
  *
- * Returns 0 on success or -ETIMEDOUT on error.
+ * Returns 0 on success or a negative errno on failure.
  */
-static int rsu_send_msg(struct stratix10_rsu_priv *priv,
-			enum stratix10_svc_command_code command,
-			unsigned long arg,
-			rsu_callback callback)
+static int __rsu_send_msg_locked(struct stratix10_rsu_priv *priv,
+				 enum stratix10_svc_command_code command,
+				 unsigned long arg,
+				 rsu_callback callback)
 {
 	struct stratix10_svc_client_msg msg;
 	int ret;
 
-	mutex_lock(&priv->lock);
+	lockdep_assert_held(&priv->lock);
+
 	reinit_completion(&priv->completion);
 	priv->client.receive_cb = callback;
 
@@ -293,6 +292,59 @@ static int rsu_send_msg(struct stratix10_rsu_priv *priv,
 
 status_done:
 	stratix10_svc_done(priv->chan);
+	return ret;
+}
+
+/**
+ * rsu_send_msg() - send a message to Intel service layer
+ * @priv: pointer to rsu private data
+ * @command: RSU status or update command
+ * @arg: the request argument, the bitstream address or notify status
+ * @callback: function pointer for the callback (status or update)
+ *
+ * Start an Intel service layer transaction to perform the SMC call that
+ * is necessary to get RSU boot log or set the address of bitstream to
+ * boot after reboot. This call will block until the RSU lock can be
+ * acquired.
+ *
+ * Returns 0 on success or a negative errno on failure.
+ */
+static int rsu_send_msg(struct stratix10_rsu_priv *priv,
+			enum stratix10_svc_command_code command,
+			unsigned long arg,
+			rsu_callback callback)
+{
+	int ret;
+
+	mutex_lock(&priv->lock);
+	ret = __rsu_send_msg_locked(priv, command, arg, callback);
+	mutex_unlock(&priv->lock);
+	return ret;
+}
+
+/**
+ * rsu_try_send_msg() - non-blocking variant of rsu_send_msg()
+ * @priv: pointer to rsu private data
+ * @command: RSU status or update command
+ * @arg: the request argument, the bitstream address or notify status
+ * @callback: function pointer for the callback (status or update)
+ *
+ * Same as rsu_send_msg() but returns -EBUSY immediately when another
+ * RSU operation is already in flight, instead of waiting for the lock.
+ *
+ * Returns 0 on success, -EBUSY if the RSU is busy, or another negative
+ * errno on failure.
+ */
+static int rsu_try_send_msg(struct stratix10_rsu_priv *priv,
+			    enum stratix10_svc_command_code command,
+			    unsigned long arg,
+			    rsu_callback callback)
+{
+	int ret;
+
+	if (!mutex_trylock(&priv->lock))
+		return -EBUSY;
+	ret = __rsu_send_msg_locked(priv, command, arg, callback);
 	mutex_unlock(&priv->lock);
 	return ret;
 }
@@ -595,8 +647,17 @@ static ssize_t reboot_image_store(struct device *dev,
 	if (ret)
 		return ret;
 
-	ret = rsu_send_msg(priv, COMMAND_RSU_UPDATE,
-			   address, rsu_command_callback);
+	/*
+	 * Use the non-blocking variant so a write to this sysfs attribute
+	 * does not stall the caller while another RSU operation is in
+	 * flight. Userspace can retry on -EBUSY.
+	 */
+	ret = rsu_try_send_msg(priv, COMMAND_RSU_UPDATE,
+			       address, rsu_command_callback);
+	if (ret == -EBUSY) {
+		dev_dbg(dev, "RSU busy, reboot_image write rejected\n");
+		return ret;
+	}
 	if (ret) {
 		dev_err(dev, "Error, RSU update returned %i\n", ret);
 		return ret;
diff --git a/drivers/firmware/stratix10-svc.c b/drivers/firmware/stratix10-svc.c
index 39eb78f5905b..c24ca5823078 100644
--- a/drivers/firmware/stratix10-svc.c
+++ b/drivers/firmware/stratix10-svc.c
@@ -243,9 +243,33 @@ struct stratix10_async_ctrl {
 };
 
 /**
+ * struct stratix10_svc_chan - service communication channel
+ * @ctrl: pointer to service controller which is the provider of this channel
+ * @scl: pointer to service client which owns the channel
+ * @name: service client name associated with the channel
+ * @task: pointer to the thread task which handles SMC or HVC call
+ * @svc_fifo: a queue for storing service message data (separate fifo for every channel)
+ * @svc_fifo_lock: protect access to service message data queue (locking pending fifo)
+ * @lock: protect access to the channel
+ * @async_chan: reference to asynchronous channel object for this channel
+ *
+ * This struct is used by service client to communicate with service layer.
+ * Each service client has its own channel created by service controller.
+ */
+struct stratix10_svc_chan {
+	struct stratix10_svc_controller *ctrl;
+	struct stratix10_svc_client *scl;
+	char *name;
+	struct task_struct *task;
+	struct kfifo svc_fifo;
+	spinlock_t svc_fifo_lock;
+	spinlock_t lock;
+	struct stratix10_async_chan *async_chan;
+};
+
+/**
  * struct stratix10_svc_controller - service controller
  * @dev: device
- * @chans: array of service channels
  * @num_chans: number of channels in 'chans' array
  * @num_active_client: number of active service client
  * @node: list management
@@ -255,13 +279,13 @@ struct stratix10_async_ctrl {
  * @svc: manages the list of client svc drivers
  * @sdm_lock: only allows a single command single response to SDM
  * @actrl: async control structure
+ * @chans: array of service channels
  *
  * This struct is used to create communication channels for service clients, to
  * handle secure monitor or hypervisor call.
  */
 struct stratix10_svc_controller {
 	struct device *dev;
-	struct stratix10_svc_chan *chans;
 	int num_chans;
 	int num_active_client;
 	struct list_head node;
@@ -271,31 +295,7 @@ struct stratix10_svc_controller {
 	struct stratix10_svc *svc;
 	struct mutex sdm_lock;
 	struct stratix10_async_ctrl actrl;
-};
-
-/**
- * struct stratix10_svc_chan - service communication channel
- * @ctrl: pointer to service controller which is the provider of this channel
- * @scl: pointer to service client which owns the channel
- * @name: service client name associated with the channel
- * @task: pointer to the thread task which handles SMC or HVC call
- * @svc_fifo: a queue for storing service message data (separate fifo for every channel)
- * @svc_fifo_lock: protect access to service message data queue (locking pending fifo)
- * @lock: protect access to the channel
- * @async_chan: reference to asynchronous channel object for this channel
- *
- * This struct is used by service client to communicate with service layer.
- * Each service client has its own channel created by service controller.
- */
-struct stratix10_svc_chan {
-	struct stratix10_svc_controller *ctrl;
-	struct stratix10_svc_client *scl;
-	char *name;
-	struct task_struct *task;
-	struct kfifo svc_fifo;
-	spinlock_t svc_fifo_lock;
-	spinlock_t lock;
-	struct stratix10_async_chan *async_chan;
+	struct stratix10_svc_chan chans[] __counted_by(num_chans);
 };
 
 static LIST_HEAD(svc_ctrl);
@@ -465,6 +465,7 @@ static void svc_thread_recv_status_ok(struct stratix10_svc_data *p_data,
 	case COMMAND_FCS_SEND_CERTIFICATE:
 	case COMMAND_FCS_DATA_ENCRYPTION:
 	case COMMAND_FCS_DATA_DECRYPTION:
+	case COMMAND_FCS_GET_PROVISION_DATA:
 		cb_data->status = BIT(SVC_STATUS_OK);
 		break;
 	case COMMAND_RECONFIG_DATA_SUBMIT:
@@ -487,13 +488,18 @@ static void svc_thread_recv_status_ok(struct stratix10_svc_data *p_data,
 		cb_data->kaddr1 = &res.a1;
 		cb_data->kaddr2 = &res.a2;
 		break;
+	case COMMAND_SMC_ATF_BUILD_VER:
+		cb_data->status = BIT(SVC_STATUS_OK);
+		cb_data->kaddr1 = &res.a1;
+		cb_data->kaddr2 = &res.a2;
+		cb_data->kaddr3 = &res.a3;
+		break;
 	case COMMAND_RSU_DCMF_VERSION:
 		cb_data->status = BIT(SVC_STATUS_OK);
 		cb_data->kaddr1 = &res.a1;
 		cb_data->kaddr2 = &res.a2;
 		break;
 	case COMMAND_FCS_RANDOM_NUMBER_GEN:
-	case COMMAND_FCS_GET_PROVISION_DATA:
 	case COMMAND_POLL_SERVICE_STATUS:
 		cb_data->status = BIT(SVC_STATUS_OK);
 		cb_data->kaddr1 = &res.a1;
@@ -676,7 +682,7 @@ static int svc_normal_to_secure_thread(void *data)
 			break;
 		case COMMAND_FCS_GET_PROVISION_DATA:
 			a0 = INTEL_SIP_SMC_FCS_GET_PROVISION_DATA;
-			a1 = (unsigned long)pdata->paddr;
+			a1 = 0;
 			a2 = 0;
 			break;
 		/* for HWMON */
@@ -706,6 +712,12 @@ static int svc_normal_to_secure_thread(void *data)
 			a1 = 0;
 			a2 = 0;
 			break;
+		case COMMAND_SMC_ATF_BUILD_VER:
+			a0 = INTEL_SIP_SMC_ATF_BUILD_VER;
+			a1 = 0;
+			a2 = 0;
+			a3 = 0;
+			break;
 		case COMMAND_MBOX_SEND_CMD:
 			a0 = INTEL_SIP_SMC_MBOX_SEND_CMD;
 			a1 = pdata->arg[0];
@@ -1910,7 +1922,6 @@ static int stratix10_svc_drv_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct stratix10_svc_controller *controller;
-	struct stratix10_svc_chan *chans;
 	struct gen_pool *genpool;
 	struct stratix10_svc_sh_memory *sh_memory;
 	struct stratix10_svc *svc = NULL;
@@ -1938,23 +1949,16 @@ static int stratix10_svc_drv_probe(struct platform_device *pdev)
 		return PTR_ERR(genpool);
 
 	/* allocate service controller and supporting channel */
-	controller = devm_kzalloc(dev, sizeof(*controller), GFP_KERNEL);
+	controller = devm_kzalloc(dev, struct_size(controller, chans, SVC_NUM_CHANNEL),
+				GFP_KERNEL);
 	if (!controller) {
 		ret = -ENOMEM;
 		goto err_destroy_pool;
 	}
 
-	chans = devm_kmalloc_array(dev, SVC_NUM_CHANNEL,
-				   sizeof(*chans), GFP_KERNEL | __GFP_ZERO);
-	if (!chans) {
-		ret = -ENOMEM;
-		goto err_destroy_pool;
-	}
-
-	controller->dev = dev;
 	controller->num_chans = SVC_NUM_CHANNEL;
+	controller->dev = dev;
 	controller->num_active_client = 0;
-	controller->chans = chans;
 	controller->genpool = genpool;
 	controller->invoke_fn = invoke_fn;
 	INIT_LIST_HEAD(&controller->node);
@@ -1975,16 +1979,16 @@ static int stratix10_svc_drv_probe(struct platform_device *pdev)
 	mutex_init(&controller->sdm_lock);
 
 	for (i = 0; i < SVC_NUM_CHANNEL; i++) {
-		chans[i].scl = NULL;
-		chans[i].ctrl = controller;
-		chans[i].name = (char *)chan_names[i];
-		spin_lock_init(&chans[i].lock);
-		ret = kfifo_alloc(&chans[i].svc_fifo, fifo_size, GFP_KERNEL);
+		controller->chans[i].scl = NULL;
+		controller->chans[i].ctrl = controller;
+		controller->chans[i].name = (char *)chan_names[i];
+		spin_lock_init(&controller->chans[i].lock);
+		ret = kfifo_alloc(&controller->chans[i].svc_fifo, fifo_size, GFP_KERNEL);
 		if (ret) {
 			dev_err(dev, "failed to allocate FIFO %d\n", i);
 			goto err_free_fifos;
 		}
-		spin_lock_init(&chans[i].svc_fifo_lock);
+		spin_lock_init(&controller->chans[i].svc_fifo_lock);
 	}
 
 	list_add_tail(&controller->node, &svc_ctrl);
@@ -2028,7 +2032,7 @@ err_free_fifos:
 		list_del(&controller->node);
 	/* free only the FIFOs that were successfully allocated */
 	while (i--)
-		kfifo_free(&chans[i].svc_fifo);
+		kfifo_free(&controller->chans[i].svc_fifo);
 	stratix10_svc_async_exit(controller);
 err_destroy_pool:
 	gen_pool_destroy(genpool);