From patchwork Sat Nov 6 17:55:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Saheed O. 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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 v2 3/3] PCI/ASPM: Remove struct pcie_link_state.clkpm_enabled Date: Sat, 6 Nov 2021 18:55:46 +0100 Message-Id: <20211106175546.27785-4-refactormyself@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20211106175546.27785-1-refactormyself@gmail.com> References: <20211106175546.27785-1-refactormyself@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The clkpm_enabled member of the struct pcie_link_state stores the current Clock PM state for the device. However, when the state changes it is persisted and thus can be retieved directly. - move calculations into pcie_clkpm_enabled() - removes clkpm_enabled from the struct pcie_link_state - removes all instance where clkpm_enable is set - replaces references to clkpm_enabled with a call to pcie_get_clkpm_state() Signed-off-by: Saheed O. Bolarinwa --- drivers/pci/pcie/aspm.c | 43 +++++++++++++++++------------------------ 1 file changed, 18 insertions(+), 25 deletions(-) diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index c1f8f10b7a4c..9425d1e38c51 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -61,7 +61,6 @@ struct pcie_link_state { u32 aspm_disable:7; /* Disabled ASPM state */ /* Clock PM state */ - u32 clkpm_enabled:1; /* Current Clock PM state */ u32 clkpm_default:1; /* Default Clock PM state by BIOS */ u32 clkpm_disable:1; /* Clock PM disabled */ @@ -104,6 +103,21 @@ static const char *policy_str[] = { #define LINK_RETRAIN_TIMEOUT HZ +static int pcie_clkpm_enabled(struct pci_dev *pdev) +{ + struct pci_dev *child; + struct pci_bus *linkbus = pdev->subordinate; + u16 ctl; + + /* CLKREQ_EN is only applicable for Upstream Ports */ + list_for_each_entry(child, &linkbus->devices, bus_list) { + pcie_capability_read_word(child, PCI_EXP_LNKCTL, &ctl); + if (!(ctl & PCI_EXP_LNKCTL_CLKREQ_EN)) + return 0; + } + return 1; +} + static int pcie_clkpm_capable(struct pci_dev *pdev) { u32 cap; @@ -165,7 +179,7 @@ static void pcie_set_clkpm(struct pcie_link_state *link, int enable) if (!pcie_clkpm_capable(link->pdev) || link->clkpm_disable) enable = 0; /* Need nothing if the specified equals to current state */ - if (link->clkpm_enabled == enable) + if (pcie_clkpm_enabled(link->pdev) == enable) return; val = enable ? PCI_EXP_LNKCTL_CLKREQ_EN : 0; @@ -173,31 +187,11 @@ static void pcie_set_clkpm(struct pcie_link_state *link, int enable) pcie_capability_clear_and_set_word(child, PCI_EXP_LNKCTL, PCI_EXP_LNKCTL_CLKREQ_EN, val); - - link->clkpm_enabled = !!enable; } static void pcie_clkpm_cap_init(struct pcie_link_state *link, int blacklist) { - int enabled = 1; - u32 reg32; - u16 reg16; - struct pci_dev *child; - struct pci_bus *linkbus = link->pdev->subordinate; - - /* All functions should have the same cap and state, take the worst */ - list_for_each_entry(child, &linkbus->devices, bus_list) { - pcie_capability_read_dword(child, PCI_EXP_LNKCAP, ®32); - if (!(reg32 & PCI_EXP_LNKCAP_CLKPM)) { - enabled = 0; - break; - } - pcie_capability_read_word(child, PCI_EXP_LNKCTL, ®16); - if (!(reg16 & PCI_EXP_LNKCTL_CLKREQ_EN)) - enabled = 0; - } - link->clkpm_enabled = enabled; - link->clkpm_default = enabled; + link->clkpm_default = pcie_clkpm_enabled(link->pdev); link->clkpm_disable = blacklist ? 1 : 0; } @@ -1272,9 +1266,8 @@ static ssize_t clkpm_show(struct device *dev, struct device_attribute *attr, char *buf) { struct pci_dev *pdev = to_pci_dev(dev); - struct pcie_link_state *link = pcie_aspm_get_link(pdev); - return sysfs_emit(buf, "%d\n", link->clkpm_enabled); + return sysfs_emit(buf, "%d\n", pcie_clkpm_enabled(pdev)); } static ssize_t clkpm_store(struct device *dev,