wil6210: add 3-MSI support

Extend MSI support to 3-MSI in order to load balance the tx\rx
interrupts between different cores.
use_msi module parameter has changed to n_msi. Usage:
- Set n_msi to 0 for using INTx
- Set n_msi to 1 for using single MSI
- Set n_msi to 3 for using 3-MSI

In 3-MSI configuration MSI 0 is used for TX interrupts, MSI 1
is used for RX interrupts and MSI 2 is used for MISC interrupts.

Signed-off-by: Alexei Avshalom Lazar <ailizaro@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

1 files changed, 46 insertions, 14 deletions

diff --git a/drivers/net/wireless/ath/wil6210/pcie_bus.c b/drivers/net/wireless/ath/wil6210/pcie_bus.c
index 7192d9a91278..095c16fc5e8a 100644
--- a/drivers/net/wireless/ath/wil6210/pcie_bus.c
+++ b/drivers/net/wireless/ath/wil6210/pcie_bus.c
@@ -24,9 +24,9 @@
 #include <linux/rtnetlink.h>
 #include <linux/pm_runtime.h>
 
-static bool use_msi = true;
-module_param(use_msi, bool, 0444);
-MODULE_PARM_DESC(use_msi, " Use MSI interrupt, default - true");
+static int n_msi = 1;
+module_param(n_msi, int, 0444);
+MODULE_PARM_DESC(n_msi, " Use MSI interrupt: 0 - use INTx, 1 - (default) - single, or 3");
 
 static bool ftm_mode;
 module_param(ftm_mode, bool, 0444);
@@ -150,12 +150,24 @@ int wil_set_capabilities(struct wil6210_priv *wil)
 
 void wil_disable_irq(struct wil6210_priv *wil)
 {
-	disable_irq(wil->pdev->irq);
+	int irq = wil->pdev->irq;
+
+	disable_irq(irq);
+	if (wil->n_msi == 3) {
+		disable_irq(irq + 1);
+		disable_irq(irq + 2);
+	}
 }
 
 void wil_enable_irq(struct wil6210_priv *wil)
 {
-	enable_irq(wil->pdev->irq);
+	int irq = wil->pdev->irq;
+
+	enable_irq(irq);
+	if (wil->n_msi == 3) {
+		enable_irq(irq + 1);
+		enable_irq(irq + 2);
+	}
 }
 
 static void wil_remove_all_additional_vifs(struct wil6210_priv *wil)
@@ -182,28 +194,47 @@ static int wil_if_pcie_enable(struct wil6210_priv *wil)
 	 * and only MSI should be used
 	 */
 	int msi_only = pdev->msi_enabled;
-	bool _use_msi = use_msi;
 
 	wil_dbg_misc(wil, "if_pcie_enable\n");
 
 	pci_set_master(pdev);
 
-	wil_dbg_misc(wil, "Setup %s interrupt\n", use_msi ? "MSI" : "INTx");
+	/* how many MSI interrupts to request? */
+	switch (n_msi) {
+	case 3:
+	case 1:
+		wil_dbg_misc(wil, "Setup %d MSI interrupts\n", n_msi);
+		break;
+	case 0:
+		wil_dbg_misc(wil, "MSI interrupts disabled, use INTx\n");
+		break;
+	default:
+		wil_err(wil, "Invalid n_msi=%d, default to 1\n", n_msi);
+		n_msi = 1;
+	}
+
+	if (n_msi == 3 &&
+	    pci_alloc_irq_vectors(pdev, n_msi, n_msi, PCI_IRQ_MSI) < n_msi) {
+		wil_err(wil, "3 MSI mode failed, try 1 MSI\n");
+		n_msi = 1;
+	}
 
-	if (use_msi && pci_enable_msi(pdev)) {
+	if (n_msi == 1 && pci_enable_msi(pdev)) {
 		wil_err(wil, "pci_enable_msi failed, use INTx\n");
-		_use_msi = false;
+		n_msi = 0;
 	}
 
-	if (!_use_msi && msi_only) {
+	wil->n_msi = n_msi;
+
+	if (wil->n_msi == 0 && msi_only) {
 		wil_err(wil, "Interrupt pin not routed, unable to use INTx\n");
 		rc = -ENODEV;
 		goto stop_master;
 	}
 
-	rc = wil6210_init_irq(wil, pdev->irq, _use_msi);
+	rc = wil6210_init_irq(wil, pdev->irq);
 	if (rc)
-		goto stop_master;
+		goto release_vectors;
 
 	/* need reset here to obtain MAC */
 	mutex_lock(&wil->mutex);
@@ -216,8 +247,9 @@ static int wil_if_pcie_enable(struct wil6210_priv *wil)
 
  release_irq:
 	wil6210_fini_irq(wil, pdev->irq);
-	/* safe to call if no MSI */
-	pci_disable_msi(pdev);
+ release_vectors:
+	/* safe to call if no allocation */
+	pci_free_irq_vectors(pdev);
  stop_master:
 	pci_clear_master(pdev);
 	return rc;