From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sinan Kaya Subject: [PATCH V7 5/5] PCI/ASPM: move link_state cleanup to bridge remove Date: Thu, 30 Mar 2017 09:30:36 -0400 Message-ID: <1490880636-30542-6-git-send-email-okaya@codeaurora.org> References: <1490880636-30542-1-git-send-email-okaya@codeaurora.org> Return-path: In-Reply-To: <1490880636-30542-1-git-send-email-okaya@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org To: linux-pci@vger.kernel.org, timur@codeaurora.org Cc: mayurkumar.patel@intel.com, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Sinan Kaya , Bjorn Helgaas , Rajat Jain , Yinghai Lu , Julia Lawall , David Daney , linux-kernel@vger.kernel.org List-Id: linux-arm-msm@vger.kernel.org For endpoints, change pcie_aspm_exit_link_state() so it cleans up the device's own state and disables ASPM if necessary, but doesn't remove the parent's link_state. For bridges, change pcie_aspm_exit_link_state() so it frees the bridge's own link_state. Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=194895 Signed-off-by: Sinan Kaya --- drivers/pci/pcie/aspm.c | 20 +++++++++++++++----- drivers/pci/remove.c | 3 +-- 2 files changed, 16 insertions(+), 7 deletions(-) diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index a38602a..e6fd297 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -960,6 +960,21 @@ void pcie_aspm_exit_link_state(struct pci_dev *pdev) struct pci_dev *parent = pdev->bus->self; struct pcie_link_state *link, *root, *parent_link; + if (pdev->has_secondary_link) { + link = pdev->link_state; + down_read(&pci_bus_sem); + mutex_lock(&aspm_lock); + + list_del(&link->sibling); + list_del(&link->link); + + /* Clock PM is for endpoint device */ + free_link_state(link); + mutex_unlock(&aspm_lock); + up_read(&pci_bus_sem); + return; + } + if (!parent || !parent->link_state) return; @@ -978,11 +993,6 @@ void pcie_aspm_exit_link_state(struct pci_dev *pdev) /* All functions are removed, so just disable ASPM for the link */ pcie_config_aspm_link(link, 0); - list_del(&link->sibling); - list_del(&link->link); - /* Clock PM is for endpoint device */ - free_link_state(link); - /* Recheck latencies and configure upstream links */ if (parent_link) { pcie_update_aspm_capable(root); diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c index 73a03d3..7e14ebd 100644 --- a/drivers/pci/remove.c +++ b/drivers/pci/remove.c @@ -25,8 +25,7 @@ static void pci_stop_dev(struct pci_dev *dev) dev->is_added = 0; } - if (dev->bus->self) - pcie_aspm_exit_link_state(dev); + pcie_aspm_exit_link_state(dev); } static void pci_destroy_dev(struct pci_dev *dev) -- 1.9.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: okaya@codeaurora.org (Sinan Kaya) Date: Thu, 30 Mar 2017 09:30:36 -0400 Subject: [PATCH V7 5/5] PCI/ASPM: move link_state cleanup to bridge remove In-Reply-To: <1490880636-30542-1-git-send-email-okaya@codeaurora.org> References: <1490880636-30542-1-git-send-email-okaya@codeaurora.org> Message-ID: <1490880636-30542-6-git-send-email-okaya@codeaurora.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org For endpoints, change pcie_aspm_exit_link_state() so it cleans up the device's own state and disables ASPM if necessary, but doesn't remove the parent's link_state. For bridges, change pcie_aspm_exit_link_state() so it frees the bridge's own link_state. Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=194895 Signed-off-by: Sinan Kaya --- drivers/pci/pcie/aspm.c | 20 +++++++++++++++----- drivers/pci/remove.c | 3 +-- 2 files changed, 16 insertions(+), 7 deletions(-) diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index a38602a..e6fd297 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -960,6 +960,21 @@ void pcie_aspm_exit_link_state(struct pci_dev *pdev) struct pci_dev *parent = pdev->bus->self; struct pcie_link_state *link, *root, *parent_link; + if (pdev->has_secondary_link) { + link = pdev->link_state; + down_read(&pci_bus_sem); + mutex_lock(&aspm_lock); + + list_del(&link->sibling); + list_del(&link->link); + + /* Clock PM is for endpoint device */ + free_link_state(link); + mutex_unlock(&aspm_lock); + up_read(&pci_bus_sem); + return; + } + if (!parent || !parent->link_state) return; @@ -978,11 +993,6 @@ void pcie_aspm_exit_link_state(struct pci_dev *pdev) /* All functions are removed, so just disable ASPM for the link */ pcie_config_aspm_link(link, 0); - list_del(&link->sibling); - list_del(&link->link); - /* Clock PM is for endpoint device */ - free_link_state(link); - /* Recheck latencies and configure upstream links */ if (parent_link) { pcie_update_aspm_capable(root); diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c index 73a03d3..7e14ebd 100644 --- a/drivers/pci/remove.c +++ b/drivers/pci/remove.c @@ -25,8 +25,7 @@ static void pci_stop_dev(struct pci_dev *dev) dev->is_added = 0; } - if (dev->bus->self) - pcie_aspm_exit_link_state(dev); + pcie_aspm_exit_link_state(dev); } static void pci_destroy_dev(struct pci_dev *dev) -- 1.9.1