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dmarc=pass (p=none dis=none) header.from=canonical.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=canonical.com Received: from localhost.localdomain (unknown [10.101.196.174]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-canonical-1.canonical.com (Postfix) with ESMTPSA id 656BC3F0FA; Tue, 16 Apr 2024 04:33:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1713242003; bh=EIqb3ZhtP6vTc/Ol0BEJS2EDfRh93Z4lytIAwmN5HBw=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=NKOtAfue4ui49NMuPLL0XAKGEFXav6o4C68s62FY4mxrjwrfM4IlFO/o2T99SB7h1 E9GAlvpSYHu6NAZtGms4ab9wfWZ9jAovmt+67i/pQuMRuWXWKL2+rkLy9MJxJPaF+s KEIUrUBacCuEPfQK6v3CfSFewEZ5Wy8L2kuC6LwlzrA3xyzo89DEDkJCNJRKNCO6wR Q68K9/AN2CaAUfc5//i/czP84EqEosxaTqfRNf4uLUWVg6etOiZW1UigHHln3r1eMj StHCFMAMxZL78xsjzt4zV6Cm/poJOsXEvB65i2FW7B7WNkqzX1AGEd1eff45PPOhfu m27lNjrJFS3Eg== From: Kai-Heng Feng To: bhelgaas@google.com Cc: mahesh@linux.ibm.com, oohall@gmail.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, bagasdotme@gmail.com, regressions@lists.linux.dev, linux-nvme@lists.infradead.org, kch@nvidia.com, hch@lst.de, gloriouseggroll@gmail.com, kbusch@kernel.org, sagi@grimberg.me, hare@suse.de, Kai-Heng Feng Subject: [PATCH v8 1/3] PCI: Add helper to check if any of ancestor device support D3cold Date: Tue, 16 Apr 2024 12:32:23 +0800 Message-Id: <20240416043225.1462548-1-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In addition to nearest upstream bridge, driver may want to know if the entire hierarchy can be powered off to perform different action. So walk higher up the hierarchy to find out if any device has valid _PR3. The user will be introduced in next patch. Signed-off-by: Kai-Heng Feng --- v8: - No change. drivers/pci/pci.c | 16 ++++++++++++++++ include/linux/pci.h | 2 ++ 2 files changed, 18 insertions(+) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index e5f243dd4288..7a5662f116b8 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -6225,6 +6225,22 @@ bool pci_pr3_present(struct pci_dev *pdev) acpi_has_method(adev->handle, "_PR3"); } EXPORT_SYMBOL_GPL(pci_pr3_present); + +bool pci_ancestor_pr3_present(struct pci_dev *pdev) +{ + struct pci_dev *parent = pdev; + + if (acpi_disabled) + return false; + + while ((parent = pci_upstream_bridge(parent))) { + if (pci_pr3_present(pdev)) + return true; + } + + return false; +} +EXPORT_SYMBOL_GPL(pci_ancestor_pr3_present); #endif /** diff --git a/include/linux/pci.h b/include/linux/pci.h index 16493426a04f..cd71ebfd0f89 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -2620,10 +2620,12 @@ struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus); void pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device *)); bool pci_pr3_present(struct pci_dev *pdev); +bool pci_ancestor_pr3_present(struct pci_dev *pdev); #else static inline struct irq_domain * pci_host_bridge_acpi_msi_domain(struct pci_bus *bus) { return NULL; } static inline bool pci_pr3_present(struct pci_dev *pdev) { return false; } +static inline bool pci_ancestor_pr3_present(struct pci_dev *pdev) { return false; } #endif #ifdef CONFIG_EEH