Merge "mhi: core: Add support for host triggered device ram dump"

5 files changed, 198 insertions, 32 deletions

diff --git a/drivers/platform/msm/mhi/mhi_bhi.c b/drivers/platform/msm/mhi/mhi_bhi.c
index e1c50e1273ac..4354b2600472 100644
--- a/drivers/platform/msm/mhi/mhi_bhi.c
+++ b/drivers/platform/msm/mhi/mhi_bhi.c
@@ -249,6 +249,13 @@ int bhi_rddm(struct mhi_device_ctxt *mhi_dev_ctxt, bool in_panic)
 {
 	struct bhi_ctxt_t *bhi_ctxt = &mhi_dev_ctxt->bhi_ctxt;
 	struct bhie_vec_table *rddm_table = &bhi_ctxt->rddm_table;
+	struct bhie_mem_info *bhie_mem_info;
+	u32 rx_sequence, val, current_seq;
+	u32 timeout = (bhi_ctxt->poll_timeout * 1000) / BHIE_RDDM_DELAY_TIME_US;
+	int i;
+	u32 cur_exec, prev_exec = 0;
+	u32 state, prev_state = 0;
+	u32 rx_status, prev_status = 0;
 
 	if (!rddm_table->bhie_mem_info) {
 		mhi_log(mhi_dev_ctxt, MHI_MSG_INFO, "RDDM table == NULL\n");
@@ -258,9 +265,93 @@ int bhi_rddm(struct mhi_device_ctxt *mhi_dev_ctxt, bool in_panic)
 	if (!in_panic)
 		return bhi_rddm_graceful(mhi_dev_ctxt);
 
-	mhi_log(mhi_dev_ctxt, MHI_MSG_ERROR,
-		"RDDM collection in panic not yet supported\n");
-	return -EINVAL;
+	/*
+	 * Below code should only be executed during kernel panic,
+	 * we expect other cores to be shutting down while we're
+	 * executing rddm transfer. After returning from this function,
+	 * we expect device to reset.
+	 */
+
+	/* Trigger device into RDDM */
+	mhi_log(mhi_dev_ctxt, MHI_MSG_INFO, "pm_state:0x%x mhi_state:%s\n",
+		mhi_dev_ctxt->mhi_pm_state,
+		TO_MHI_STATE_STR(mhi_dev_ctxt->mhi_state));
+	if (!MHI_REG_ACCESS_VALID(mhi_dev_ctxt->mhi_pm_state)) {
+		mhi_log(mhi_dev_ctxt, MHI_MSG_ERROR,
+			"Register access not allowed\n");
+		return -EIO;
+	}
+
+	/*
+	 * Normally we only set mhi_pm_state after grabbing pm_xfer_lock as a
+	 * write, by function mhi_tryset_pm_state. Since we're in a kernel
+	 * panic, we will set pm state w/o grabbing xfer lock. We're setting
+	 * pm_state to LD as a safety precautions. If another core in middle
+	 * of register access this should deter it. However, there is no
+	 * no gurantee change will take effect.
+	 */
+	mhi_dev_ctxt->mhi_pm_state = MHI_PM_LD_ERR_FATAL_DETECT;
+	/* change should take effect immediately */
+	smp_wmb();
+
+	bhie_mem_info = &rddm_table->
+		bhie_mem_info[rddm_table->segment_count - 1];
+	rx_sequence = rddm_table->sequence++;
+
+	/* program the vector table */
+	mhi_log(mhi_dev_ctxt, MHI_MSG_INFO, "Programming RXVEC table\n");
+	val = HIGH_WORD(bhie_mem_info->phys_addr);
+	mhi_reg_write(mhi_dev_ctxt, bhi_ctxt->bhi_base,
+		      BHIE_RXVECADDR_HIGH_OFFS, val);
+	val = LOW_WORD(bhie_mem_info->phys_addr);
+	mhi_reg_write(mhi_dev_ctxt, bhi_ctxt->bhi_base, BHIE_RXVECADDR_LOW_OFFS,
+		      val);
+	val = (u32)bhie_mem_info->size;
+	mhi_reg_write(mhi_dev_ctxt, bhi_ctxt->bhi_base, BHIE_RXVECSIZE_OFFS,
+		      val);
+	mhi_reg_write_field(mhi_dev_ctxt, bhi_ctxt->bhi_base, BHIE_RXVECDB_OFFS,
+			    BHIE_TXVECDB_SEQNUM_BMSK, BHIE_TXVECDB_SEQNUM_SHFT,
+			    rx_sequence);
+
+	/* trigger device into rddm */
+	mhi_log(mhi_dev_ctxt, MHI_MSG_INFO,
+		"Triggering Device into RDDM mode\n");
+	mhi_set_m_state(mhi_dev_ctxt, MHI_STATE_SYS_ERR);
+	i = 0;
+
+	while (timeout--) {
+		cur_exec = mhi_reg_read(bhi_ctxt->bhi_base, BHI_EXECENV);
+		state = mhi_get_m_state(mhi_dev_ctxt);
+		rx_status = mhi_reg_read(bhi_ctxt->bhi_base,
+					 BHIE_RXVECSTATUS_OFFS);
+		/* if reg. values changed or each sec (udelay(1000)) log it */
+		if (cur_exec != prev_exec || state != prev_state ||
+		    rx_status != prev_status || !(i & (SZ_1K - 1))) {
+			mhi_log(mhi_dev_ctxt, MHI_MSG_INFO,
+				"EXECENV:0x%x MHISTATE:0x%x RXSTATUS:0x%x\n",
+				cur_exec, state, rx_status);
+			prev_exec = cur_exec;
+			prev_state = state;
+			prev_status = rx_status;
+		};
+		current_seq = (rx_status & BHIE_TXVECSTATUS_SEQNUM_BMSK) >>
+			BHIE_TXVECSTATUS_SEQNUM_SHFT;
+		rx_status = (rx_status & BHIE_TXVECSTATUS_STATUS_BMSK) >>
+			BHIE_TXVECSTATUS_STATUS_SHFT;
+
+		if ((rx_status == BHIE_TXVECSTATUS_STATUS_XFER_COMPL) &&
+		    (current_seq == rx_sequence)) {
+			mhi_log(mhi_dev_ctxt, MHI_MSG_INFO,
+				"rddm transfer completed\n");
+			return 0;
+		}
+		udelay(BHIE_RDDM_DELAY_TIME_US);
+		i++;
+	}
+
+	mhi_log(mhi_dev_ctxt, MHI_MSG_ERROR, "rddm transfer timeout\n");
+
+	return -EIO;
 }
 
 static int bhi_load_firmware(struct mhi_device_ctxt *mhi_dev_ctxt,
@@ -439,7 +530,6 @@ void bhi_firmware_download(struct work_struct *work)
 	struct bhi_ctxt_t *bhi_ctxt;
 	struct bhie_mem_info mem_info;
 	int ret;
-	long timeout;
 
 	mhi_dev_ctxt = container_of(work, struct mhi_device_ctxt,
 				    bhi_ctxt.fw_load_work);
@@ -448,7 +538,14 @@ void bhi_firmware_download(struct work_struct *work)
 	mhi_log(mhi_dev_ctxt, MHI_MSG_INFO, "Enter\n");
 
 	wait_event_interruptible(*mhi_dev_ctxt->mhi_ev_wq.bhi_event,
-			mhi_dev_ctxt->mhi_state == MHI_STATE_BHI);
+		mhi_dev_ctxt->mhi_state == MHI_STATE_BHI ||
+		mhi_dev_ctxt->mhi_pm_state == MHI_PM_LD_ERR_FATAL_DETECT);
+	if (mhi_dev_ctxt->mhi_pm_state == MHI_PM_LD_ERR_FATAL_DETECT ||
+	    mhi_dev_ctxt->mhi_state != MHI_STATE_BHI) {
+		mhi_log(mhi_dev_ctxt, MHI_MSG_ERROR,
+			"MHI is not in valid state for firmware download\n");
+		return;
+	}
 
 	/* PBL image is the first segment in firmware vector table */
 	mem_info = *bhi_ctxt->fw_table.bhie_mem_info;
@@ -462,10 +559,12 @@ void bhi_firmware_download(struct work_struct *work)
 	mhi_init_state_transition(mhi_dev_ctxt,
 				  STATE_TRANSITION_RESET);
 
-	timeout = wait_event_timeout(*mhi_dev_ctxt->mhi_ev_wq.bhi_event,
-				mhi_dev_ctxt->dev_exec_env == MHI_EXEC_ENV_BHIE,
-				msecs_to_jiffies(bhi_ctxt->poll_timeout));
-	if (!timeout) {
+	wait_event_timeout(*mhi_dev_ctxt->mhi_ev_wq.bhi_event,
+		mhi_dev_ctxt->dev_exec_env == MHI_EXEC_ENV_BHIE ||
+		mhi_dev_ctxt->mhi_pm_state == MHI_PM_LD_ERR_FATAL_DETECT,
+		msecs_to_jiffies(bhi_ctxt->poll_timeout));
+	if (mhi_dev_ctxt->mhi_pm_state == MHI_PM_LD_ERR_FATAL_DETECT ||
+	    mhi_dev_ctxt->dev_exec_env != MHI_EXEC_ENV_BHIE) {
 		mhi_log(mhi_dev_ctxt, MHI_MSG_ERROR,
 			"Failed to Enter EXEC_ENV_BHIE\n");
 		return;
diff --git a/drivers/platform/msm/mhi/mhi_bhi.h b/drivers/platform/msm/mhi/mhi_bhi.h
index 8f7b3d69347c..8f9bc52bbbe0 100644
--- a/drivers/platform/msm/mhi/mhi_bhi.h
+++ b/drivers/platform/msm/mhi/mhi_bhi.h
@@ -87,6 +87,7 @@
 
 #define BHI_POLL_SLEEP_TIME_MS 100
 #define BHI_POLL_TIMEOUT_MS 2000
+#define BHIE_RDDM_DELAY_TIME_US (1000)
 
 int bhi_probe(struct mhi_device_ctxt *mhi_dev_ctxt);
 void bhi_firmware_download(struct work_struct *work);
diff --git a/drivers/platform/msm/mhi/mhi_pm.c b/drivers/platform/msm/mhi/mhi_pm.c
index caa34eadf8ea..ad9a6fd6b278 100644
--- a/drivers/platform/msm/mhi/mhi_pm.c
+++ b/drivers/platform/msm/mhi/mhi_pm.c
@@ -22,6 +22,22 @@
 #include "mhi_hwio.h"
 #include "mhi_bhi.h"
 
+static const char *const mhi_dev_ctrl_str[MHI_DEV_CTRL_MAXCMD] = {
+	[MHI_DEV_CTRL_INIT] = "INIT",
+	[MHI_DEV_CTRL_DE_INIT] = "DE-INIT",
+	[MHI_DEV_CTRL_SUSPEND] = "SUSPEND",
+	[MHI_DEV_CTRL_RESUME] = "RESUME",
+	[MHI_DEV_CTRL_POWER_OFF] = "OFF",
+	[MHI_DEV_CTRL_POWER_ON] = "ON",
+	[MHI_DEV_CTRL_TRIGGER_RDDM] = "TRIGGER RDDM",
+	[MHI_DEV_CTRL_RDDM] = "RDDM",
+	[MHI_DEV_CTRL_RDDM_KERNEL_PANIC] = "RDDM IN PANIC",
+	[MHI_DEV_CTRL_NOTIFY_LINK_ERROR] = "LD",
+};
+
+#define TO_MHI_DEV_CTRL_STR(cmd) ((cmd >= MHI_DEV_CTRL_MAXCMD) ? "INVALID" : \
+				  mhi_dev_ctrl_str[cmd])
+
 /* Write only sysfs attributes */
 static DEVICE_ATTR(MHI_M0, S_IWUSR, NULL, sysfs_init_m0);
 static DEVICE_ATTR(MHI_M3, S_IWUSR, NULL, sysfs_init_m3);
@@ -97,12 +113,14 @@ static int mhi_pm_initiate_m3(struct mhi_device_ctxt *mhi_dev_ctxt,
 	mhi_dev_ctxt->assert_wake(mhi_dev_ctxt, false);
 	read_unlock_bh(&mhi_dev_ctxt->pm_xfer_lock);
 	r = wait_event_timeout(*mhi_dev_ctxt->mhi_ev_wq.m0_event,
-			       mhi_dev_ctxt->mhi_state == MHI_STATE_M0 ||
-			       mhi_dev_ctxt->mhi_state == MHI_STATE_M1,
-			       msecs_to_jiffies(MHI_MAX_RESUME_TIMEOUT));
-	if (!r) {
+		mhi_dev_ctxt->mhi_state == MHI_STATE_M0 ||
+		mhi_dev_ctxt->mhi_state == MHI_STATE_M1 ||
+		mhi_dev_ctxt->mhi_pm_state == MHI_PM_LD_ERR_FATAL_DETECT,
+		msecs_to_jiffies(MHI_MAX_RESUME_TIMEOUT));
+	if (!r || mhi_dev_ctxt->mhi_pm_state == MHI_PM_LD_ERR_FATAL_DETECT) {
 		mhi_log(mhi_dev_ctxt, MHI_MSG_ERROR,
-			"Failed to get M0||M1 event, timeout, current state:%s\n",
+			"Failed to get M0||M1 event or LD pm_state:0x%x state:%s\n",
+			mhi_dev_ctxt->mhi_pm_state,
 			TO_MHI_STATE_STR(mhi_dev_ctxt->mhi_state));
 		return -EIO;
 	}
@@ -122,9 +140,10 @@ static int mhi_pm_initiate_m3(struct mhi_device_ctxt *mhi_dev_ctxt,
 	write_unlock_irq(&mhi_dev_ctxt->pm_xfer_lock);
 	mhi_log(mhi_dev_ctxt, MHI_MSG_INFO, "Waiting for M3 completion.\n");
 	r = wait_event_timeout(*mhi_dev_ctxt->mhi_ev_wq.m3_event,
-			       mhi_dev_ctxt->mhi_state == MHI_STATE_M3,
-			       msecs_to_jiffies(MHI_MAX_SUSPEND_TIMEOUT));
-	if (!r) {
+		mhi_dev_ctxt->mhi_state == MHI_STATE_M3 ||
+		mhi_dev_ctxt->mhi_pm_state == MHI_PM_LD_ERR_FATAL_DETECT,
+		msecs_to_jiffies(MHI_MAX_SUSPEND_TIMEOUT));
+	if (!r || mhi_dev_ctxt->mhi_pm_state == MHI_PM_LD_ERR_FATAL_DETECT) {
 		mhi_log(mhi_dev_ctxt, MHI_MSG_ERROR,
 			"Failed to get M3 event, timeout, current state:%s\n",
 			TO_MHI_STATE_STR(mhi_dev_ctxt->mhi_state));
@@ -158,12 +177,13 @@ static int mhi_pm_initiate_m0(struct mhi_device_ctxt *mhi_dev_ctxt)
 	mhi_set_m_state(mhi_dev_ctxt, MHI_STATE_M0);
 	write_unlock_irq(&mhi_dev_ctxt->pm_xfer_lock);
 	r = wait_event_timeout(*mhi_dev_ctxt->mhi_ev_wq.m0_event,
-			       mhi_dev_ctxt->mhi_state == MHI_STATE_M0 ||
-			       mhi_dev_ctxt->mhi_state == MHI_STATE_M1,
-			       msecs_to_jiffies(MHI_MAX_RESUME_TIMEOUT));
-	if (!r) {
+		mhi_dev_ctxt->mhi_state == MHI_STATE_M0 ||
+		mhi_dev_ctxt->mhi_state == MHI_STATE_M1 ||
+		mhi_dev_ctxt->mhi_pm_state == MHI_PM_LD_ERR_FATAL_DETECT,
+		msecs_to_jiffies(MHI_MAX_RESUME_TIMEOUT));
+	if (!r || mhi_dev_ctxt->mhi_pm_state == MHI_PM_LD_ERR_FATAL_DETECT) {
 		mhi_log(mhi_dev_ctxt, MHI_MSG_ERROR,
-			"Failed to get M0 event, timeout\n");
+			"Failed to get M0 event, timeout or LD\n");
 		r = -EIO;
 	} else
 		r = 0;
@@ -295,13 +315,16 @@ static int mhi_pm_slave_mode_power_on(struct mhi_device_ctxt *mhi_dev_ctxt)
 	mhi_dev_ctxt->assert_wake(mhi_dev_ctxt, false);
 	read_unlock_irq(&mhi_dev_ctxt->pm_xfer_lock);
 
-	ret_val = wait_for_completion_timeout(&mhi_dev_ctxt->cmd_complete,
-					      msecs_to_jiffies(timeout));
-	if (!ret_val || mhi_dev_ctxt->dev_exec_env != MHI_EXEC_ENV_AMSS)
+	wait_for_completion_timeout(&mhi_dev_ctxt->cmd_complete,
+				    msecs_to_jiffies(timeout));
+	if (mhi_dev_ctxt->dev_exec_env != MHI_EXEC_ENV_AMSS)
 		ret_val = -EIO;
 	else
 		ret_val = 0;
 
+	/* wait for firmware download to complete */
+	flush_work(&mhi_dev_ctxt->bhi_ctxt.fw_load_work);
+
 	if (ret_val) {
 		read_lock_irq(&mhi_dev_ctxt->pm_xfer_lock);
 		mhi_dev_ctxt->deassert_wake(mhi_dev_ctxt);
@@ -537,16 +560,16 @@ void mhi_link_state_cb(struct msm_pcie_notify *notify)
 	}
 }
 
-int mhi_pm_control_device(struct mhi_device *mhi_device,
-		       enum mhi_dev_ctrl ctrl)
+int mhi_pm_control_device(struct mhi_device *mhi_device, enum mhi_dev_ctrl ctrl)
 {
 	struct mhi_device_ctxt *mhi_dev_ctxt = mhi_device->mhi_dev_ctxt;
+	unsigned long flags;
 
 	if (!mhi_dev_ctxt)
 		return -EINVAL;
 
-	mhi_log(mhi_dev_ctxt, MHI_MSG_INFO,
-		"Entered with cmd:%d\n", ctrl);
+	mhi_log(mhi_dev_ctxt, MHI_MSG_INFO, "Entered with cmd:%s\n",
+		TO_MHI_DEV_CTRL_STR(ctrl));
 
 	switch (ctrl) {
 	case MHI_DEV_CTRL_INIT:
@@ -560,12 +583,46 @@ int mhi_pm_control_device(struct mhi_device *mhi_device,
 	case MHI_DEV_CTRL_POWER_OFF:
 		mhi_pm_slave_mode_power_off(mhi_dev_ctxt);
 		break;
+	case MHI_DEV_CTRL_TRIGGER_RDDM:
+		write_lock_irqsave(&mhi_dev_ctxt->pm_xfer_lock, flags);
+		if (!MHI_REG_ACCESS_VALID(mhi_dev_ctxt->mhi_pm_state)) {
+			write_unlock_irqrestore(&mhi_dev_ctxt->pm_xfer_lock,
+						flags);
+			mhi_log(mhi_dev_ctxt, MHI_MSG_INFO,
+				"failed to trigger rddm, no register access in state:0x%x\n",
+				mhi_dev_ctxt->mhi_pm_state);
+			return -EIO;
+		}
+		mhi_set_m_state(mhi_dev_ctxt, MHI_STATE_SYS_ERR);
+		write_unlock_irqrestore(&mhi_dev_ctxt->pm_xfer_lock, flags);
+		break;
 	case MHI_DEV_CTRL_RDDM:
 		return bhi_rddm(mhi_dev_ctxt, false);
+	case MHI_DEV_CTRL_RDDM_KERNEL_PANIC:
+		return bhi_rddm(mhi_dev_ctxt, true);
 	case MHI_DEV_CTRL_DE_INIT:
-		if (mhi_dev_ctxt->mhi_pm_state != MHI_PM_DISABLE)
+		if (mhi_dev_ctxt->mhi_pm_state != MHI_PM_DISABLE) {
+			enum MHI_PM_STATE cur_state;
+			/*
+			 * If bus master calls DE_INIT before calling POWER_OFF
+			 * means a critical failure occurred during POWER_ON
+			 * state transition and external PCIe device may not
+			 * respond to host.  Force PM state to PCIe linkdown
+			 * state prior to starting shutdown process to avoid
+			 * accessing PCIe link.
+			 */
+			write_lock_irq(&mhi_dev_ctxt->pm_xfer_lock);
+			cur_state = mhi_tryset_pm_state(mhi_dev_ctxt,
+						MHI_PM_LD_ERR_FATAL_DETECT);
+			write_unlock_irq(&mhi_dev_ctxt->pm_xfer_lock);
+			if (unlikely(cur_state != MHI_PM_LD_ERR_FATAL_DETECT)) {
+				mhi_log(mhi_dev_ctxt, MHI_MSG_ERROR,
+					"Failed to transition to state 0x%x from 0x%x\n",
+					MHI_PM_LD_ERR_FATAL_DETECT, cur_state);
+			}
 			process_disable_transition(MHI_PM_SHUTDOWN_PROCESS,
 						   mhi_dev_ctxt);
+		}
 		bhi_exit(mhi_dev_ctxt);
 		break;
 	case MHI_DEV_CTRL_NOTIFY_LINK_ERROR:
@@ -580,6 +637,12 @@ int mhi_pm_control_device(struct mhi_device *mhi_device,
 			mhi_log(mhi_dev_ctxt, MHI_MSG_INFO,
 				"Failed to transition to state 0x%x from 0x%x\n",
 				MHI_PM_LD_ERR_FATAL_DETECT, cur_state);
+
+		/* wake up all threads that's waiting for state change events */
+		complete(&mhi_dev_ctxt->cmd_complete);
+		wake_up_interruptible(mhi_dev_ctxt->mhi_ev_wq.bhi_event);
+		wake_up(mhi_dev_ctxt->mhi_ev_wq.m0_event);
+		wake_up(mhi_dev_ctxt->mhi_ev_wq.m3_event);
 		break;
 	}
 	default:
diff --git a/drivers/platform/msm/mhi/mhi_states.c b/drivers/platform/msm/mhi/mhi_states.c
index 2906393cbd5c..ea2a91bd2d06 100644
--- a/drivers/platform/msm/mhi/mhi_states.c
+++ b/drivers/platform/msm/mhi/mhi_states.c
@@ -147,7 +147,8 @@ void mhi_set_m_state(struct mhi_device_ctxt *mhi_dev_ctxt,
  *     M1 -> M3_ENTER --> M3
  * L1: SYS_ERR_DETECT -> SYS_ERR_PROCESS --> POR
  * L2: SHUTDOWN_PROCESS -> DISABLE -> SSR_PENDING (via SSR Notification only)
- * L3: LD_ERR_FATAL_DETECT -> SHUTDOWN_PROCESS
+ * L3: LD_ERR_FATAL_DETECT <--> LD_ERR_FATAL_DETECT
+ *     LD_ERR_FATAL_DETECT -> SHUTDOWN_PROCESS
  */
 static const struct mhi_pm_transitions const mhi_state_transitions[] = {
 	/* L0 States */
@@ -216,7 +217,7 @@ static const struct mhi_pm_transitions const mhi_state_transitions[] = {
 	/* L3 States */
 	{
 		MHI_PM_LD_ERR_FATAL_DETECT,
-		MHI_PM_SHUTDOWN_PROCESS
+		MHI_PM_LD_ERR_FATAL_DETECT | MHI_PM_SHUTDOWN_PROCESS
 	},
 	/* From SSR notification only */
 	{
diff --git a/include/linux/msm_mhi.h b/include/linux/msm_mhi.h
index 01fe2e78b9d5..1704cb93e6a3 100644
--- a/include/linux/msm_mhi.h
+++ b/include/linux/msm_mhi.h
@@ -160,9 +160,11 @@ enum mhi_dev_ctrl {
 	MHI_DEV_CTRL_RESUME,
 	MHI_DEV_CTRL_POWER_OFF,
 	MHI_DEV_CTRL_POWER_ON,
+	MHI_DEV_CTRL_TRIGGER_RDDM,
 	MHI_DEV_CTRL_RDDM,
 	MHI_DEV_CTRL_RDDM_KERNEL_PANIC,
 	MHI_DEV_CTRL_NOTIFY_LINK_ERROR,
+	MHI_DEV_CTRL_MAXCMD,
 };
 
 enum mhi_rddm_segment {