[PATCH v2 01/12] wil6210: run-time PM when interface down

[Maya Erez <qca_merez@qca.qualcomm.com>]

From: Lazar Alexei <qca_ailizaro@qca.qualcomm.com>

Allow run-time suspend when interface is down, keep card alive when
interface is up.
If driver is in wmi only or debug_fw mode run-time PM won't suspend.

Signed-off-by: Lazar Alexei <qca_ailizaro@qca.qualcomm.com>
Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
---
 drivers/net/wireless/ath/wil6210/debugfs.c  | 96 ++++++++++++++++++++++++++---
 drivers/net/wireless/ath/wil6210/ethtool.c  | 15 +++++
 drivers/net/wireless/ath/wil6210/netdev.c   | 18 +++++-
 drivers/net/wireless/ath/wil6210/pcie_bus.c | 36 ++++++++++-
 drivers/net/wireless/ath/wil6210/pm.c       | 62 +++++++++++++++++++
 drivers/net/wireless/ath/wil6210/wil6210.h  | 16 +++++
 6 files changed, 231 insertions(+), 12 deletions(-)

diff --git a/drivers/net/wireless/ath/wil6210/debugfs.c b/drivers/net/wireless/ath/wil6210/debugfs.c
index e58dc6d..06b9c56 100644
--- a/drivers/net/wireless/ath/wil6210/debugfs.c
+++ b/drivers/net/wireless/ath/wil6210/debugfs.c
@@ -242,12 +242,19 @@ static void wil_print_ring(struct seq_file *s, const char *prefix,
 static int wil_mbox_debugfs_show(struct seq_file *s, void *data)
 {
 	struct wil6210_priv *wil = s->private;
+	int ret;
+
+	ret = wil_pm_runtime_get(wil);
+	if (ret < 0)
+		return ret;
 
 	wil_print_ring(s, "tx", wil->csr + HOST_MBOX +
 		       offsetof(struct wil6210_mbox_ctl, tx));
 	wil_print_ring(s, "rx", wil->csr + HOST_MBOX +
 		       offsetof(struct wil6210_mbox_ctl, rx));
 
+	wil_pm_runtime_put(wil);
+
 	return 0;
 }
 
@@ -265,15 +272,37 @@ static int wil_mbox_seq_open(struct inode *inode, struct file *file)
 
 static int wil_debugfs_iomem_x32_set(void *data, u64 val)
 {
-	writel(val, (void __iomem *)data);
+	struct wil_debugfs_iomem_data *d = (struct
+					    wil_debugfs_iomem_data *)data;
+	struct wil6210_priv *wil = d->wil;
+	int ret;
+
+	ret = wil_pm_runtime_get(wil);
+	if (ret < 0)
+		return ret;
+
+	writel(val, (void __iomem *)d->offset);
 	wmb(); /* make sure write propagated to HW */
 
+	wil_pm_runtime_put(wil);
+
 	return 0;
 }
 
 static int wil_debugfs_iomem_x32_get(void *data, u64 *val)
 {
-	*val = readl((void __iomem *)data);
+	struct wil_debugfs_iomem_data *d = (struct
+					    wil_debugfs_iomem_data *)data;
+	struct wil6210_priv *wil = d->wil;
+	int ret;
+
+	ret = wil_pm_runtime_get(wil);
+	if (ret < 0)
+		return ret;
+
+	*val = readl((void __iomem *)d->offset);
+
+	wil_pm_runtime_put(wil);
 
 	return 0;
 }
@@ -284,10 +313,21 @@ static int wil_debugfs_iomem_x32_get(void *data, u64 *val)
 static struct dentry *wil_debugfs_create_iomem_x32(const char *name,
 						   umode_t mode,
 						   struct dentry *parent,
-						   void *value)
+						   void *value,
+						   struct wil6210_priv *wil)
 {
-	return debugfs_create_file(name, mode, parent, value,
-				   &fops_iomem_x32);
+	struct dentry *file;
+	struct wil_debugfs_iomem_data *data = &wil->dbg_data.data_arr[
+					      wil->dbg_data.iomem_data_count];
+
+	data->wil = wil;
+	data->offset = value;
+
+	file = debugfs_create_file(name, mode, parent, data, &fops_iomem_x32);
+	if (!IS_ERR_OR_NULL(file))
+		wil->dbg_data.iomem_data_count++;
+
+	return file;
 }
 
 static int wil_debugfs_ulong_set(void *data, u64 val)
@@ -346,7 +386,8 @@ static void wil6210_debugfs_init_offset(struct wil6210_priv *wil,
 		case doff_io32:
 			f = wil_debugfs_create_iomem_x32(tbl[i].name,
 							 tbl[i].mode, dbg,
-							 base + tbl[i].off);
+							 base + tbl[i].off,
+							 wil);
 			break;
 		case doff_u8:
 			f = debugfs_create_u8(tbl[i].name, tbl[i].mode, dbg,
@@ -475,13 +516,22 @@ static int wil6210_debugfs_create_ITR_CNT(struct wil6210_priv *wil,
 static int wil_memread_debugfs_show(struct seq_file *s, void *data)
 {
 	struct wil6210_priv *wil = s->private;
-	void __iomem *a = wmi_buffer(wil, cpu_to_le32(mem_addr));
+	void __iomem *a;
+	int ret;
+
+	ret = wil_pm_runtime_get(wil);
+	if (ret < 0)
+		return ret;
+
+	a = wmi_buffer(wil, cpu_to_le32(mem_addr));
 
 	if (a)
 		seq_printf(s, "[0x%08x] = 0x%08x\n", mem_addr, readl(a));
 	else
 		seq_printf(s, "[0x%08x] = INVALID\n", mem_addr);
 
+	wil_pm_runtime_put(wil);
+
 	return 0;
 }
 
@@ -502,10 +552,12 @@ static ssize_t wil_read_file_ioblob(struct file *file, char __user *user_buf,
 {
 	enum { max_count = 4096 };
 	struct wil_blob_wrapper *wil_blob = file->private_data;
+	struct wil6210_priv *wil = wil_blob->wil;
 	loff_t pos = *ppos;
 	size_t available = wil_blob->blob.size;
 	void *buf;
 	size_t ret;
+	int rc;
 
 	if (test_bit(wil_status_suspending, wil_blob->wil->status) ||
 	    test_bit(wil_status_suspended, wil_blob->wil->status))
@@ -526,10 +578,19 @@ static ssize_t wil_read_file_ioblob(struct file *file, char __user *user_buf,
 	if (!buf)
 		return -ENOMEM;
 
+	rc = wil_pm_runtime_get(wil);
+	if (rc < 0) {
+		kfree(buf);
+		return rc;
+	}
+
 	wil_memcpy_fromio_32(buf, (const void __iomem *)
 			     wil_blob->blob.data + pos, count);
 
 	ret = copy_to_user(user_buf, buf, count);
+
+	wil_pm_runtime_put(wil);
+
 	kfree(buf);
 	if (ret == count)
 		return -EFAULT;
@@ -1736,14 +1797,31 @@ static void wil6210_debugfs_init_isr(struct wil6210_priv *wil,
 	{},
 };
 
+static const int dbg_off_count = 4 * (ARRAY_SIZE(isr_off) - 1) +
+				ARRAY_SIZE(dbg_wil_regs) - 1 +
+				ARRAY_SIZE(pseudo_isr_off) - 1 +
+				ARRAY_SIZE(lgc_itr_cnt_off) - 1 +
+				ARRAY_SIZE(tx_itr_cnt_off) - 1 +
+				ARRAY_SIZE(rx_itr_cnt_off) - 1;
+
 int wil6210_debugfs_init(struct wil6210_priv *wil)
 {
 	struct dentry *dbg = wil->debug = debugfs_create_dir(WIL_NAME,
 			wil_to_wiphy(wil)->debugfsdir);
-
 	if (IS_ERR_OR_NULL(dbg))
 		return -ENODEV;
 
+	wil->dbg_data.data_arr = kcalloc(dbg_off_count,
+					 sizeof(struct wil_debugfs_iomem_data),
+					 GFP_KERNEL);
+	if (!wil->dbg_data.data_arr) {
+		debugfs_remove_recursive(dbg);
+		wil->debug = NULL;
+		return -ENOMEM;
+	}
+
+	wil->dbg_data.iomem_data_count = 0;
+
 	wil_pmc_init(wil);
 
 	wil6210_debugfs_init_files(wil, dbg);
@@ -1768,6 +1846,8 @@ void wil6210_debugfs_remove(struct wil6210_priv *wil)
 	debugfs_remove_recursive(wil->debug);
 	wil->debug = NULL;
 
+	kfree(wil->dbg_data.data_arr);
+
 	/* free pmc memory without sending command to fw, as it will
 	 * be reset on the way down anyway
 	 */
diff --git a/drivers/net/wireless/ath/wil6210/ethtool.c b/drivers/net/wireless/ath/wil6210/ethtool.c
index adcfef4..66200f6 100644
--- a/drivers/net/wireless/ath/wil6210/ethtool.c
+++ b/drivers/net/wireless/ath/wil6210/ethtool.c
@@ -47,9 +47,14 @@ static int wil_ethtoolops_get_coalesce(struct net_device *ndev,
 	struct wil6210_priv *wil = ndev_to_wil(ndev);
 	u32 tx_itr_en, tx_itr_val = 0;
 	u32 rx_itr_en, rx_itr_val = 0;
+	int ret;
 
 	wil_dbg_misc(wil, "ethtoolops_get_coalesce\n");
 
+	ret = wil_pm_runtime_get(wil);
+	if (ret < 0)
+		return ret;
+
 	tx_itr_en = wil_r(wil, RGF_DMA_ITR_TX_CNT_CTL);
 	if (tx_itr_en & BIT_DMA_ITR_TX_CNT_CTL_EN)
 		tx_itr_val = wil_r(wil, RGF_DMA_ITR_TX_CNT_TRSH);
@@ -58,6 +63,8 @@ static int wil_ethtoolops_get_coalesce(struct net_device *ndev,
 	if (rx_itr_en & BIT_DMA_ITR_RX_CNT_CTL_EN)
 		rx_itr_val = wil_r(wil, RGF_DMA_ITR_RX_CNT_TRSH);
 
+	wil_pm_runtime_put(wil);
+
 	cp->tx_coalesce_usecs = tx_itr_val;
 	cp->rx_coalesce_usecs = rx_itr_val;
 	return 0;
@@ -67,6 +74,7 @@ static int wil_ethtoolops_set_coalesce(struct net_device *ndev,
 				       struct ethtool_coalesce *cp)
 {
 	struct wil6210_priv *wil = ndev_to_wil(ndev);
+	int ret;
 
 	wil_dbg_misc(wil, "ethtoolops_set_coalesce: rx %d usec, tx %d usec\n",
 		     cp->rx_coalesce_usecs, cp->tx_coalesce_usecs);
@@ -86,8 +94,15 @@ static int wil_ethtoolops_set_coalesce(struct net_device *ndev,
 
 	wil->tx_max_burst_duration = cp->tx_coalesce_usecs;
 	wil->rx_max_burst_duration = cp->rx_coalesce_usecs;
+
+	ret = wil_pm_runtime_get(wil);
+	if (ret < 0)
+		return ret;
+
 	wil_configure_interrupt_moderation(wil);
 
+	wil_pm_runtime_put(wil);
+
 	return 0;
 
 out_bad:
diff --git a/drivers/net/wireless/ath/wil6210/netdev.c b/drivers/net/wireless/ath/wil6210/netdev.c
index 4a6ab2d..b641ac1 100644
--- a/drivers/net/wireless/ath/wil6210/netdev.c
+++ b/drivers/net/wireless/ath/wil6210/netdev.c
@@ -21,6 +21,7 @@
 static int wil_open(struct net_device *ndev)
 {
 	struct wil6210_priv *wil = ndev_to_wil(ndev);
+	int rc;
 
 	wil_dbg_misc(wil, "open\n");
 
@@ -30,16 +31,29 @@ static int wil_open(struct net_device *ndev)
 		return -EINVAL;
 	}
 
-	return wil_up(wil);
+	rc = wil_pm_runtime_get(wil);
+	if (rc < 0)
+		return rc;
+
+	rc = wil_up(wil);
+	if (rc)
+		wil_pm_runtime_put(wil);
+
+	return rc;
 }
 
 static int wil_stop(struct net_device *ndev)
 {
 	struct wil6210_priv *wil = ndev_to_wil(ndev);
+	int rc;
 
 	wil_dbg_misc(wil, "stop\n");
 
-	return wil_down(wil);
+	rc = wil_down(wil);
+	if (!rc)
+		wil_pm_runtime_put(wil);
+
+	return rc;
 }
 
 static const struct net_device_ops wil_netdev_ops = {
diff --git a/drivers/net/wireless/ath/wil6210/pcie_bus.c b/drivers/net/wireless/ath/wil6210/pcie_bus.c
index 6a3ab4b..ba35b32 100644
--- a/drivers/net/wireless/ath/wil6210/pcie_bus.c
+++ b/drivers/net/wireless/ath/wil6210/pcie_bus.c
@@ -21,6 +21,7 @@
 #include <linux/suspend.h>
 #include "wil6210.h"
 #include <linux/rtnetlink.h>
+#include <linux/pm_runtime.h>
 
 static bool use_msi = true;
 module_param(use_msi, bool, 0444);
@@ -333,6 +334,7 @@ static int wil_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	wil6210_debugfs_init(wil);
 
+	wil_pm_runtime_allow(wil);
 
 	return 0;
 
@@ -365,6 +367,8 @@ static void wil_pcie_remove(struct pci_dev *pdev)
 #endif /* CONFIG_PM_SLEEP */
 #endif /* CONFIG_PM */
 
+	wil_pm_runtime_forbid(wil);
+
 	wil6210_debugfs_remove(wil);
 	rtnl_lock();
 	wil_p2p_wdev_free(wil);
@@ -386,7 +390,6 @@ static void wil_pcie_remove(struct pci_dev *pdev)
 MODULE_DEVICE_TABLE(pci, wil6210_pcie_ids);
 
 #ifdef CONFIG_PM
-#ifdef CONFIG_PM_SLEEP
 
 static int wil6210_suspend(struct device *dev, bool is_runtime)
 {
@@ -490,12 +493,41 @@ static int wil6210_pm_resume(struct device *dev)
 {
 	return wil6210_resume(dev, false);
 }
-#endif /* CONFIG_PM_SLEEP */
 
+static int wil6210_pm_runtime_idle(struct device *dev)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct wil6210_priv *wil = pci_get_drvdata(pdev);
+
+	wil_dbg_pm(wil, "Runtime idle\n");
+
+	return wil_can_suspend(wil, true);
+}
+
+static int wil6210_pm_runtime_resume(struct device *dev)
+{
+	return wil6210_resume(dev, true);
+}
+
+static int wil6210_pm_runtime_suspend(struct device *dev)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct wil6210_priv *wil = pci_get_drvdata(pdev);
+
+	if (test_bit(wil_status_suspended, wil->status)) {
+		wil_dbg_pm(wil, "trying to suspend while suspended\n");
+		return 1;
+	}
+
+	return wil6210_suspend(dev, true);
+}
 #endif /* CONFIG_PM */
 
 static const struct dev_pm_ops wil6210_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(wil6210_pm_suspend, wil6210_pm_resume)
+	SET_RUNTIME_PM_OPS(wil6210_pm_runtime_suspend,
+			   wil6210_pm_runtime_resume,
+			   wil6210_pm_runtime_idle)
 };
 
 static struct pci_driver wil6210_driver = {
diff --git a/drivers/net/wireless/ath/wil6210/pm.c b/drivers/net/wireless/ath/wil6210/pm.c
index 8f5d1b44..2ef2f34 100644
--- a/drivers/net/wireless/ath/wil6210/pm.c
+++ b/drivers/net/wireless/ath/wil6210/pm.c
@@ -16,15 +16,26 @@
 
 #include "wil6210.h"
 #include <linux/jiffies.h>
+#include <linux/pm_runtime.h>
+
+#define WIL6210_AUTOSUSPEND_DELAY_MS (1000)
 
 int wil_can_suspend(struct wil6210_priv *wil, bool is_runtime)
 {
 	int rc = 0;
 	struct wireless_dev *wdev = wil->wdev;
 	struct net_device *ndev = wil_to_ndev(wil);
+	bool wmi_only = test_bit(WMI_FW_CAPABILITY_WMI_ONLY,
+				 wil->fw_capabilities);
 
 	wil_dbg_pm(wil, "can_suspend: %s\n", is_runtime ? "runtime" : "system");
 
+	if (wmi_only || debug_fw) {
+		wil_dbg_pm(wil, "Deny any suspend - %s mode\n",
+			   wmi_only ? "wmi_only" : "debug_fw");
+		rc = -EPERM;
+		goto out;
+	}
 	if (!(ndev->flags & IFF_UP)) {
 		/* can always sleep when down */
 		wil_dbg_pm(wil, "Interface is down\n");
@@ -44,6 +55,10 @@ int wil_can_suspend(struct wil6210_priv *wil, bool is_runtime)
 	/* interface is running */
 	switch (wdev->iftype) {
 	case NL80211_IFTYPE_MONITOR:
+		wil_dbg_pm(wil, "Sniffer\n");
+		rc = -EBUSY;
+		goto out;
+	/* for STA-like interface, don't runtime suspend */
 	case NL80211_IFTYPE_STATION:
 	case NL80211_IFTYPE_P2P_CLIENT:
 		if (test_bit(wil_status_fwconnecting, wil->status)) {
@@ -51,6 +66,12 @@ int wil_can_suspend(struct wil6210_priv *wil, bool is_runtime)
 			rc = -EBUSY;
 			goto out;
 		}
+		/* Runtime pm not supported in case the interface is up */
+		if (is_runtime) {
+			wil_dbg_pm(wil, "STA-like interface\n");
+			rc = -EBUSY;
+			goto out;
+		}
 		break;
 	/* AP-like interface - can't suspend */
 	default:
@@ -348,3 +369,44 @@ int wil_resume(struct wil6210_priv *wil, bool is_runtime)
 		   is_runtime ? "runtime" : "system", rc, suspend_time_usec);
 	return rc;
 }
+
+void wil_pm_runtime_allow(struct wil6210_priv *wil)
+{
+	struct device *dev = wil_to_dev(wil);
+
+	pm_runtime_put_noidle(dev);
+	pm_runtime_set_autosuspend_delay(dev, WIL6210_AUTOSUSPEND_DELAY_MS);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_allow(dev);
+}
+
+void wil_pm_runtime_forbid(struct wil6210_priv *wil)
+{
+	struct device *dev = wil_to_dev(wil);
+
+	pm_runtime_forbid(dev);
+	pm_runtime_get_noresume(dev);
+}
+
+int wil_pm_runtime_get(struct wil6210_priv *wil)
+{
+	int rc;
+	struct device *dev = wil_to_dev(wil);
+
+	rc = pm_runtime_get_sync(dev);
+	if (rc < 0) {
+		wil_err(wil, "pm_runtime_get_sync() failed, rc = %d\n", rc);
+		pm_runtime_put_noidle(dev);
+		return rc;
+	}
+
+	return 0;
+}
+
+void wil_pm_runtime_put(struct wil6210_priv *wil)
+{
+	struct device *dev = wil_to_dev(wil);
+
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
+}
diff --git a/drivers/net/wireless/ath/wil6210/wil6210.h b/drivers/net/wireless/ath/wil6210/wil6210.h
index 1e340d0..90dbdcb 100644
--- a/drivers/net/wireless/ath/wil6210/wil6210.h
+++ b/drivers/net/wireless/ath/wil6210/wil6210.h
@@ -616,6 +616,16 @@ struct blink_on_off_time {
 	u32 off_ms;
 };
 
+struct wil_debugfs_iomem_data {
+	void *offset;
+	struct wil6210_priv *wil;
+};
+
+struct wil_debugfs_data {
+	struct wil_debugfs_iomem_data *data_arr;
+	int iomem_data_count;
+};
+
 extern struct blink_on_off_time led_blink_time[WIL_LED_TIME_LAST];
 extern u8 led_id;
 extern u8 led_polarity;
@@ -708,6 +718,7 @@ struct wil6210_priv {
 	u8 abft_len;
 	u8 wakeup_trigger;
 	struct wil_suspend_stats suspend_stats;
+	struct wil_debugfs_data dbg_data;
 
 	void *platform_handle;
 	struct wil_platform_ops platform_ops;
@@ -999,6 +1010,11 @@ int wil_request_firmware(struct wil6210_priv *wil, const char *name,
 			 bool load);
 bool wil_fw_verify_file_exists(struct wil6210_priv *wil, const char *name);
 
+void wil_pm_runtime_allow(struct wil6210_priv *wil);
+void wil_pm_runtime_forbid(struct wil6210_priv *wil);
+int wil_pm_runtime_get(struct wil6210_priv *wil);
+void wil_pm_runtime_put(struct wil6210_priv *wil);
+
 int wil_can_suspend(struct wil6210_priv *wil, bool is_runtime);
 int wil_suspend(struct wil6210_priv *wil, bool is_runtime);
 int wil_resume(struct wil6210_priv *wil, bool is_runtime);
-- 
1.9.1