4.18-stable review patch. If anyone has any objections, please let me know.
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From: Jian-Hong Pan jian-hong@endlessm.com
[ Upstream commit d49c88d7677ba737e9d2759a87db0402d5ab2607 ]
Originally, we have an issue where r8169 MSI-X interrupt is broken after S3 suspend/resume on RTL8106e of ASUS X441UAR.
02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller [10ec:8136] (rev 07) Subsystem: ASUSTeK Computer Inc. RTL810xE PCI Express Fast Ethernet controller [1043:200f] Flags: bus master, fast devsel, latency 0, IRQ 16 I/O ports at e000 [size=256] Memory at ef100000 (64-bit, non-prefetchable) [size=4K] Memory at e0000000 (64-bit, prefetchable) [size=16K] Capabilities: [40] Power Management version 3 Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+ Capabilities: [70] Express Endpoint, MSI 01 Capabilities: [b0] MSI-X: Enable+ Count=4 Masked- Capabilities: [d0] Vital Product Data Capabilities: [100] Advanced Error Reporting Capabilities: [140] Virtual Channel Capabilities: [160] Device Serial Number 01-00-00-00-36-4c-e0-00 Capabilities: [170] Latency Tolerance Reporting Kernel driver in use: r8169 Kernel modules: r8169
We found the all of the values in PCI BAR=4 of the ethernet adapter become 0xFF after system resumes. That breaks the MSI-X interrupt. Therefore, we can only fall back to MSI interrupt to fix the issue at that time.
However, there is a commit which resolves the drivers getting nothing in PCI BAR=4 after system resumes. It is 04cb3ae895d7 "PCI: Reprogram bridge prefetch registers on resume" by Daniel Drake.
After apply the patch, the ethernet adapter works fine before suspend and after resume. So, we can revert the workaround after the commit "PCI: Reprogram bridge prefetch registers on resume" is merged into main tree.
This patch reverts commit 7bb05b85bc2d1a1b647b91424b2ed4a18e6ecd81 "r8169: don't use MSI-X on RTL8106e".
Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=201181 Fixes: 7bb05b85bc2d ("r8169: don't use MSI-X on RTL8106e") Signed-off-by: Jian-Hong Pan jian-hong@endlessm.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/realtek/r8169.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-)
--- a/drivers/net/ethernet/realtek/r8169.c +++ b/drivers/net/ethernet/realtek/r8169.c @@ -7539,20 +7539,17 @@ static int rtl_alloc_irq(struct rtl8169_ { unsigned int flags;
- switch (tp->mac_version) { - case RTL_GIGA_MAC_VER_01 ... RTL_GIGA_MAC_VER_06: + if (tp->mac_version <= RTL_GIGA_MAC_VER_06) { RTL_W8(tp, Cfg9346, Cfg9346_Unlock); RTL_W8(tp, Config2, RTL_R8(tp, Config2) & ~MSIEnable); RTL_W8(tp, Cfg9346, Cfg9346_Lock); flags = PCI_IRQ_LEGACY; - break; - case RTL_GIGA_MAC_VER_39 ... RTL_GIGA_MAC_VER_40: + } else if (tp->mac_version == RTL_GIGA_MAC_VER_40) { /* This version was reported to have issues with resume * from suspend when using MSI-X */ flags = PCI_IRQ_LEGACY | PCI_IRQ_MSI; - break; - default: + } else { flags = PCI_IRQ_ALL_TYPES; }