From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7670934D4D9; Tue, 21 Oct 2025 17:23:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761067391; cv=none; b=H7UqmITucjMiAI3r2Iqtn6yuAxEz7FJmXmwGsRzPJhWMOeTlav02uXqkyy34s+J8w/FrNHz0hfuxJ040/3spVYp31RhNlWM6GdJrhqteqtlPq+dSe1+j4ZSNtFBOgtxuXNl9PusGjzSDdFfV83p0YWzP/nAVldz9BD89DhZ3o68= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761067391; c=relaxed/simple; bh=WtDAPjj2uGIdoRAWnE+iIkBURVgXeLBKvep422kdXHE=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition:In-Reply-To; b=NZa8lOsmwqyF6Uck6Mp2lYAxIlE+ok3ZX3t59upEMPHL4CJmyOU52stgNWyJz3ylNzWj6r6hjSB+cGI5XGyag8ukX0t6Aul4jdSpWkGlS/TaVkOLZe8bDXL0jKgY/o6NLxyV3K84sf6gdFCX3fcAvSFW6ZfCK0Z7AdIjbkF6zJ4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FZjJF+4r; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="FZjJF+4r" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A3E29C4CEF1; Tue, 21 Oct 2025 17:23:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761067390; bh=WtDAPjj2uGIdoRAWnE+iIkBURVgXeLBKvep422kdXHE=; h=Date:From:To:Cc:Subject:In-Reply-To:From; b=FZjJF+4r91jouTqR4ZCGqzgg0rVgTjnvGMOtExNJniwX5dWlP4jCwmBXfEbVJuqti 7IXt4pidP071Ogg9iGMBn38tmDXu75p9f2J92QJqiccOw/kxe0mEufMpxqK+n/b6dM JQAKYV8Ne/rBstqxIewQZaV49n8p7GNi8MD9GN0UDraKVCTlcY1S4/GjbsiBtM/wzp 46uYfybDE61g6tR53qeFxSYdNJeFgsV+m+ov7nVifWmTKiUzdoU5abyz9XKoCaj+2l zIsZH9Tdg/O/QqQ2UaxeiOqnNWBbkVyDpD702xmI0jgsENuk+XdJ+za6yM1daKa4Aa hOm1C5wxr6JfQ== Date: Tue, 21 Oct 2025 12:23:09 -0500 From: Bjorn Helgaas To: Ravi Kumar Bandi Cc: mani@kernel.org, thippeswamy.havalige@amd.com, lpieralisi@kernel.org, bhelgaas@google.com, linux-pci@vger.kernel.org, kwilczynski@kernel.org, robh@kernel.org, michal.simek@amd.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Stefan Roese , Sean Anderson Subject: Re: [PATCH v2] PCI: xilinx-xdma: Enable INTx interrupts Message-ID: <20251021172309.GA1198438@bhelgaas> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250920225232.18757-1-ravib@amazon.com> [+cc Stefan, Sean] On Sat, Sep 20, 2025 at 10:52:32PM +0000, Ravi Kumar Bandi wrote: > The pcie-xilinx-dma-pl driver does not enable INTx interrupts > after initializing the port, preventing INTx interrupts from > PCIe endpoints from flowing through the Xilinx XDMA root port > bridge. This issue affects kernel 6.6.0 and later versions. > > This patch allows INTx interrupts generated by PCIe endpoints > to flow through the root port. Tested the fix on a board with > two endpoints generating INTx interrupts. Interrupts are > properly detected and serviced. The /proc/interrupts output > shows: > > [...] > 32: 320 0 pl_dma:RC-Event 16 Level 400000000.axi-pcie, azdrv > 52: 470 0 pl_dma:RC-Event 16 Level 500000000.axi-pcie, azdrv > [...] > > Changes since v1:: > - Fixed commit message per reviewer's comments > > Fixes: 8d786149d78c ("PCI: xilinx-xdma: Add Xilinx XDMA Root Port driver") > Cc: stable@vger.kernel.org > Signed-off-by: Ravi Kumar Bandi Hi Ravi, obviously you tested this, but I don't know how to reconcile this with Stefan's INTx fix at https://lore.kernel.org/r/20251021154322.973640-1-stefan.roese@mailbox.org Does Stefan's fix need to be squashed into this patch? > --- > drivers/pci/controller/pcie-xilinx-dma-pl.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/pci/controller/pcie-xilinx-dma-pl.c b/drivers/pci/controller/pcie-xilinx-dma-pl.c > index b037c8f315e4..cc539292d10a 100644 > --- a/drivers/pci/controller/pcie-xilinx-dma-pl.c > +++ b/drivers/pci/controller/pcie-xilinx-dma-pl.c > @@ -659,6 +659,12 @@ static int xilinx_pl_dma_pcie_setup_irq(struct pl_dma_pcie *port) > return err; > } > > + /* Enable interrupts */ > + pcie_write(port, XILINX_PCIE_DMA_IMR_ALL_MASK, > + XILINX_PCIE_DMA_REG_IMR); > + pcie_write(port, XILINX_PCIE_DMA_IDRN_MASK, > + XILINX_PCIE_DMA_REG_IDRN_MASK); > + > return 0; > } > > -- > 2.47.3 >