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Bolarinwa" To: helgaas@kernel.org Cc: "Saheed O. Bolarinwa" , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v1 5/6] PCI/ASPM: Move pcie_aspm_sanity_check() upwards Date: Sat, 6 Nov 2021 18:53:52 +0100 Message-Id: <20211106175353.26248-6-refactormyself@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20211106175353.26248-1-refactormyself@gmail.com> References: <20211106175353.26248-1-refactormyself@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Move pcie_aspm_sanity_check() upwards to make more accessible. Signed-off-by: Saheed O. Bolarinwa --- drivers/pci/pcie/aspm.c | 70 ++++++++++++++++++++--------------------- 1 file changed, 35 insertions(+), 35 deletions(-) diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index 9aaae476ea31..05ca165380e1 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -447,6 +447,41 @@ static void pci_clear_and_set_dword(struct pci_dev *pdev, int pos, pci_write_config_dword(pdev, pos, val); } +static int pcie_aspm_sanity_check(struct pci_dev *pdev) +{ + struct pci_dev *child; + u32 reg32; + + /* + * Some functions in a slot might not all be PCIe functions, + * very strange. Disable ASPM for the whole slot + */ + list_for_each_entry(child, &pdev->subordinate->devices, bus_list) { + if (!pci_is_pcie(child)) + return -EINVAL; + + /* + * If ASPM is disabled then we're not going to change + * the BIOS state. It's safe to continue even if it's a + * pre-1.1 device + */ + + if (aspm_disabled) + continue; + + /* + * Disable ASPM for pre-1.1 PCIe device, we follow MS to use + * RBER bit to determine if a function is 1.1 version device + */ + pcie_capability_read_dword(child, PCI_EXP_DEVCAP, ®32); + if (!(reg32 & PCI_EXP_DEVCAP_RBER) && !aspm_force) { + pci_info(child, "disabling ASPM on pre-1.1 PCIe device. You can enable it with 'pcie_aspm=force'\n"); + return -EINVAL; + } + } + return 0; +} + /* Calculate L1.2 PM substate timing parameters */ static void aspm_calc_l1ss_info(struct pcie_link_state *link, u32 aspm_support, u32 parent_l1ss_cap, @@ -846,41 +881,6 @@ static void free_link_state(struct pcie_link_state *link) kfree(link); } -static int pcie_aspm_sanity_check(struct pci_dev *pdev) -{ - struct pci_dev *child; - u32 reg32; - - /* - * Some functions in a slot might not all be PCIe functions, - * very strange. Disable ASPM for the whole slot - */ - list_for_each_entry(child, &pdev->subordinate->devices, bus_list) { - if (!pci_is_pcie(child)) - return -EINVAL; - - /* - * If ASPM is disabled then we're not going to change - * the BIOS state. It's safe to continue even if it's a - * pre-1.1 device - */ - - if (aspm_disabled) - continue; - - /* - * Disable ASPM for pre-1.1 PCIe device, we follow MS to use - * RBER bit to determine if a function is 1.1 version device - */ - pcie_capability_read_dword(child, PCI_EXP_DEVCAP, ®32); - if (!(reg32 & PCI_EXP_DEVCAP_RBER) && !aspm_force) { - pci_info(child, "disabling ASPM on pre-1.1 PCIe device. You can enable it with 'pcie_aspm=force'\n"); - return -EINVAL; - } - } - return 0; -} - static struct pcie_link_state *alloc_pcie_link_state(struct pci_dev *pdev) { struct pcie_link_state *link; -- 2.20.1