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PCI: mediatek: Clear interrupt status before dispatching handler

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[ Upstream commit 4e11c29873 ]

We found a failure when using the iperf tool during WiFi performance
testing, where some MSIs were received while clearing the interrupt
status, and these MSIs cannot be serviced.

The interrupt status can be cleared even if the MSI status remains pending.
As such, given the edge-triggered interrupt type, its status should be
cleared before being dispatched to the handler of the underling device.

[kwilczynski: commit log, code comment wording]
Link: https://lore.kernel.org/linux-pci/20231211094923.31967-1-jianjun.wang@mediatek.com
Fixes: 43e6409db6 ("PCI: mediatek: Add MSI support for MT2712 and MT7622")
Signed-off-by: qizhong cheng <qizhong.cheng@mediatek.com>
Signed-off-by: Jianjun Wang <jianjun.wang@mediatek.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
[bhelgaas: rewrap comment]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Cc:  <stable@vger.kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
qizhong cheng
2023-12-11 17:49:23 +08:00
committed by Greg Kroah-Hartman
parent b060cfd3f7
commit fd110f42e3
1 changed files with 8 additions and 2 deletions
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drivers/pci/controller/pcie-mediatek.c
+8 -2
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@@ -605,14 +605,20 @@ static void mtk_pcie_intr_handler(struct irq_desc *desc)
if (status & MSI_STATUS){
unsigned long imsi_status;
/*
* The interrupt status can be cleared even if the
* MSI status remains pending. As such, given the
* edge-triggered interrupt type, its status should
* be cleared before being dispatched to the
* handler of the underlying device.
*/
writel(MSI_STATUS, port->base + PCIE_INT_STATUS);
while ((imsi_status = readl(port->base + PCIE_IMSI_STATUS))) {
for_each_set_bit(bit, &imsi_status, MTK_MSI_IRQS_NUM) {
virq = irq_find_mapping(port->inner_domain, bit);
generic_handle_irq(virq);
}
}
/* Clear MSI interrupt status */
writel(MSI_STATUS, port->base + PCIE_INT_STATUS);
}
}