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 81AEC4778B; Mon, 1 Apr 2024 15:56:01 +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=1711986961; cv=none; b=GyXmYQXo/qxK+WxFGgtohvZTXalPvh1bpyxYpXPNybpp6zN8vqcKIjg/EaioRRHMZY/RH9CIbBatLsiphMFl07vz+wVMoMtRETVhdOOl9XaYP/FgWdxUfuZvMyPi/A5psVs/zwk0b/INZ9Q7u5uHW4B2EvwUGMYRzNuERO/YYl8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711986961; c=relaxed/simple; bh=xpDrgOFVPmzqoiunuNerFViOTwGD5gMysYsTpvAxTSs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=CqnRqHO9CXnyvYE/fA5UJ/ExYRq8oibhwOb9HswhhYLtqz2DExlfk8Bsnwi8K4uFNQxEJNuWQOi92O5c4M2uDheuGSgLRn73T2+4DtZoaG4RyI+qRuLBV4GLkOcRs2KvUNAbLVCYwR8A/eI7NcVbevzy/jDMX2ZkjUdixMe7em8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=nhoYi2Wr; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="nhoYi2Wr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0825BC433C7; Mon, 1 Apr 2024 15:56:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1711986961; bh=xpDrgOFVPmzqoiunuNerFViOTwGD5gMysYsTpvAxTSs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nhoYi2WrNUSt9l9mDB39SkiJ6vrFxmr+RrJKWZmsIkY0J50azaosyVSJ13IQucRpS WslFhGPNm77ri51/CniRk5I40OrT3oaJuCqjgPE46An5iihk2Wzji3rrzKqgd7FyIB eR4LKhYokL266rYmhogogVCj8Q9cnMUAXlJLMUjU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Niklas Cassel , =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= , Manivannan Sadhasivam , Sasha Levin Subject: [PATCH 6.8 141/399] PCI: dwc: endpoint: Fix advertised resizable BAR size Date: Mon, 1 Apr 2024 17:41:47 +0200 Message-ID: <20240401152553.399756246@linuxfoundation.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240401152549.131030308@linuxfoundation.org> References: <20240401152549.131030308@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.8-stable review patch. If anyone has any objections, please let me know. ------------------ From: Niklas Cassel [ Upstream commit 72e34b8593e08a0ee759b7a038e0b178418ea6f8 ] The commit message in commit fc9a77040b04 ("PCI: designware-ep: Configure Resizable BAR cap to advertise the smallest size") claims that it modifies the Resizable BAR capability to only advertise support for 1 MB size BARs. However, the commit writes all zeroes to PCI_REBAR_CAP (the register which contains the possible BAR sizes that a BAR be resized to). According to the spec, it is illegal to not have a bit set in PCI_REBAR_CAP, and 1 MB is the smallest size allowed. Set bit 4 in PCI_REBAR_CAP, so that we actually advertise support for a 1 MB BAR size. Before: Capabilities: [2e8 v1] Physical Resizable BAR BAR 0: current size: 1MB BAR 1: current size: 1MB BAR 2: current size: 1MB BAR 3: current size: 1MB BAR 4: current size: 1MB BAR 5: current size: 1MB After: Capabilities: [2e8 v1] Physical Resizable BAR BAR 0: current size: 1MB, supported: 1MB BAR 1: current size: 1MB, supported: 1MB BAR 2: current size: 1MB, supported: 1MB BAR 3: current size: 1MB, supported: 1MB BAR 4: current size: 1MB, supported: 1MB BAR 5: current size: 1MB, supported: 1MB Fixes: fc9a77040b04 ("PCI: designware-ep: Configure Resizable BAR cap to advertise the smallest size") Link: https://lore.kernel.org/linux-pci/20240307111520.3303774-1-cassel@kernel.org Signed-off-by: Niklas Cassel Signed-off-by: Krzysztof Wilczyński Reviewed-by: Manivannan Sadhasivam Cc: # 5.2 Signed-off-by: Sasha Levin --- drivers/pci/controller/dwc/pcie-designware-ep.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c index 9a437cfce073c..746a11dcb67f1 100644 --- a/drivers/pci/controller/dwc/pcie-designware-ep.c +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c @@ -629,8 +629,13 @@ int dw_pcie_ep_init_complete(struct dw_pcie_ep *ep) nbars = (reg & PCI_REBAR_CTRL_NBAR_MASK) >> PCI_REBAR_CTRL_NBAR_SHIFT; + /* + * PCIe r6.0, sec 7.8.6.2 require us to support at least one + * size in the range from 1 MB to 512 GB. Advertise support + * for 1 MB BAR size only. + */ for (i = 0; i < nbars; i++, offset += PCI_REBAR_CTRL) - dw_pcie_writel_dbi(pci, offset + PCI_REBAR_CAP, 0x0); + dw_pcie_writel_dbi(pci, offset + PCI_REBAR_CAP, BIT(4)); } /* -- 2.43.0