diff mbox series

[1/1,SRU,OEM-5.13] rtw88: Disable PCIe ASPM while doing NAPI poll on 8821CE

Message ID 20211223092456.1544132-1-acelan.kao@canonical.com
State New
Headers show
Series [1/1,SRU,OEM-5.13] rtw88: Disable PCIe ASPM while doing NAPI poll on 8821CE | expand

Commit Message

AceLan Kao Dec. 23, 2021, 9:24 a.m. UTC 
From: Kai-Heng Feng <kai.heng.feng@canonical.com>

BugLink: https://bugs.launchpad.net/bugs/1927808

Many Intel based platforms face system random freeze after commit
9e2fd29864c5 ("rtw88: add napi support").

The commit itself shouldn't be the culprit. My guess is that the 8821CE
only leaves ASPM L1 for a short period when IRQ is raised. Since IRQ is
masked during NAPI polling, the PCIe link stays at L1 and makes RX DMA
extremely slow. Eventually the RX ring becomes messed up:
[ 1133.194697] rtw_8821ce 0000:02:00.0: pci bus timeout, check dma status

Since the 8821CE hardware may fail to leave ASPM L1, manually do it in
the driver to resolve the issue.

Fixes: 9e2fd29864c5 ("rtw88: add napi support")
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=215131
BugLink: https://bugs.launchpad.net/bugs/1927808
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Acked-by: Jian-Hong Pan <jhp@endlessos.org>
(backported from commit 24f5e38a13b5ae2b6105cda8bb47c19108e62a9a linux-next)
Signed-off-by: Chia-Lin Kao (AceLan) <acelan.kao@canonical.com>
---
 drivers/net/wireless/realtek/rtw88/pci.c | 52 +++++++++---------------
 drivers/net/wireless/realtek/rtw88/pci.h |  2 +
 2 files changed, 21 insertions(+), 33 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/wireless/realtek/rtw88/pci.c b/drivers/net/wireless/realtek/rtw88/pci.c
index e7d17ab8f113b..029bd7de9db2a 100644
--- a/drivers/net/wireless/realtek/rtw88/pci.c
+++ b/drivers/net/wireless/realtek/rtw88/pci.c
@@ -2,7 +2,6 @@ 
 /* Copyright(c) 2018-2019  Realtek Corporation
  */
 
-#include <linux/dmi.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 #include "main.h"
@@ -1395,7 +1394,11 @@  static void rtw_pci_link_ps(struct rtw_dev *rtwdev, bool enter)
 	 * throughput. This is probably because the ASPM behavior slightly
 	 * varies from different SOC.
 	 */
-	if (rtwpci->link_ctrl & PCI_EXP_LNKCTL_ASPM_L1)
+	if (!(rtwpci->link_ctrl & PCI_EXP_LNKCTL_ASPM_L1))
+		return;
+
+	if ((enter && atomic_dec_if_positive(&rtwpci->link_usage) == 0) ||
+	    (!enter && atomic_inc_return(&rtwpci->link_usage) == 1))
 		rtw_pci_aspm_set(rtwdev, enter);
 }
 
@@ -1630,6 +1633,9 @@  static int rtw_pci_napi_poll(struct napi_struct *napi, int budget)
 					      priv);
 	int work_done = 0;
 
+	if (rtwpci->rx_no_aspm)
+		rtw_pci_link_ps(rtwdev, false);
+
 	while (work_done < budget) {
 		u32 work_done_once;
 
@@ -1653,6 +1659,8 @@  static int rtw_pci_napi_poll(struct napi_struct *napi, int budget)
 		if (rtw_pci_get_hw_rx_ring_nr(rtwdev, rtwpci))
 			napi_schedule(napi);
 	}
+	if (rtwpci->rx_no_aspm)
+		rtw_pci_link_ps(rtwdev, true);
 
 	return work_done;
 }
@@ -1674,41 +1682,13 @@  static void rtw_pci_napi_deinit(struct rtw_dev *rtwdev)
 	netif_napi_del(&rtwpci->napi);
 }
 
-enum rtw88_quirk_dis_pci_caps {
-	QUIRK_DIS_PCI_CAP_MSI,
-	QUIRK_DIS_PCI_CAP_ASPM,
-};
-
-static int disable_pci_caps(const struct dmi_system_id *dmi)
-{
-	uintptr_t dis_caps = (uintptr_t)dmi->driver_data;
-
-	if (dis_caps & BIT(QUIRK_DIS_PCI_CAP_MSI))
-		rtw_disable_msi = true;
-	if (dis_caps & BIT(QUIRK_DIS_PCI_CAP_ASPM))
-		rtw_pci_disable_aspm = true;
-
-	return 1;
-}
-
-static const struct dmi_system_id rtw88_pci_quirks[] = {
-	{
-		.callback = disable_pci_caps,
-		.ident = "Protempo Ltd L116HTN6SPW",
-		.matches = {
-			DMI_MATCH(DMI_SYS_VENDOR, "Protempo Ltd"),
-			DMI_MATCH(DMI_PRODUCT_NAME, "L116HTN6SPW"),
-		},
-		.driver_data = (void *)BIT(QUIRK_DIS_PCI_CAP_ASPM),
-	},
-	{}
-};
-
 int rtw_pci_probe(struct pci_dev *pdev,
 		  const struct pci_device_id *id)
 {
+	struct pci_dev *bridge = pci_upstream_bridge(pdev);
 	struct ieee80211_hw *hw;
 	struct rtw_dev *rtwdev;
+	struct rtw_pci *rtwpci;
 	int drv_data_size;
 	int ret;
 
@@ -1726,6 +1706,9 @@  int rtw_pci_probe(struct pci_dev *pdev,
 	rtwdev->hci.ops = &rtw_pci_ops;
 	rtwdev->hci.type = RTW_HCI_TYPE_PCIE;
 
+	rtwpci = (struct rtw_pci *)rtwdev->priv;
+	atomic_set(&rtwpci->link_usage, 1);
+
 	ret = rtw_core_init(rtwdev);
 	if (ret)
 		goto err_release_hw;
@@ -1754,7 +1737,10 @@  int rtw_pci_probe(struct pci_dev *pdev,
 		goto err_destroy_pci;
 	}
 
-	dmi_check_system(rtw88_pci_quirks);
+	/* Disable PCIe ASPM L1 while doing NAPI poll for 8821CE */
+	if (pdev->device == 0xc821 && bridge->vendor == PCI_VENDOR_ID_INTEL)
+		rtwpci->rx_no_aspm = true;
+
 	rtw_pci_phy_cfg(rtwdev);
 
 	ret = rtw_register_hw(rtwdev, hw);
diff --git a/drivers/net/wireless/realtek/rtw88/pci.h b/drivers/net/wireless/realtek/rtw88/pci.h
index 0ffae887527a2..cbbae130e620b 100644
--- a/drivers/net/wireless/realtek/rtw88/pci.h
+++ b/drivers/net/wireless/realtek/rtw88/pci.h
@@ -222,6 +222,8 @@  struct rtw_pci {
 	struct rtw_pci_tx_ring tx_rings[RTK_MAX_TX_QUEUE_NUM];
 	struct rtw_pci_rx_ring rx_rings[RTK_MAX_RX_QUEUE_NUM];
 	u16 link_ctrl;
+	atomic_t link_usage;
+	bool rx_no_aspm;
 	DECLARE_BITMAP(flags, NUM_OF_RTW_PCI_FLAGS);
 
 	void __iomem *mmap;