From: rafael@kernel.org (Rafael J. Wysocki)
Subject: [PATCH v2 1/2] PCI: PCIe: ASPM: Introduce pcie_aspm_enabled_mask()
Date: Thu, 8 Aug 2019 16:48:42 +0200 [thread overview]
Message-ID: <CAJZ5v0gMzVYdC-xZYLWYmBZ-a3-R8LND=11YJFCXdzrtyyZW=Q@mail.gmail.com> (raw)
In-Reply-To: <20190808131536.GE151852@google.com>
On Thu, Aug 8, 2019@3:15 PM Bjorn Helgaas <helgaas@kernel.org> wrote:
>
> On Thu, Aug 08, 2019@12:06:52PM +0200, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
> >
> > Add a function returning the mask of currently enabled ASPM link
> > states for a given device.
> >
> > It will be used by the NVMe driver to decide how to handle the
> > device during system suspend.
> >
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
> > ---
> >
> > -> v2:
> > * Move the PCI/PCIe ASPM changes to a separate patch.
> > * Add the _mask suffix to the new function name.
> > * Add EXPORT_SYMBOL_GPL() to the new function.
> > * Avoid adding an unnecessary blank line.
> >
> > ---
> > drivers/pci/pcie/aspm.c | 20 ++++++++++++++++++++
> > include/linux/pci.h | 3 +++
> > 2 files changed, 23 insertions(+)
> >
> > Index: linux-pm/drivers/pci/pcie/aspm.c
> > ===================================================================
> > --- linux-pm.orig/drivers/pci/pcie/aspm.c
> > +++ linux-pm/drivers/pci/pcie/aspm.c
> > @@ -1170,6 +1170,26 @@ static int pcie_aspm_get_policy(char *bu
> > module_param_call(policy, pcie_aspm_set_policy, pcie_aspm_get_policy,
> > NULL, 0644);
> >
> > +/*
> > + * pcie_aspm_enabled_mask - Return the mask of enabled ASPM link states.
> > + * @pci_device: Target device.
> > + */
> > +u32 pcie_aspm_enabled_mask(struct pci_dev *pci_device)
> > +{
> > + struct pci_dev *bridge = pci_upstream_bridge(pci_device);
> > + u32 ret;
> > +
> > + if (!bridge)
> > + return 0;
> > +
> > + mutex_lock(&aspm_lock);
> > + ret = bridge->link_state ? bridge->link_state->aspm_enabled : 0;
>
> This returns the "aspm_enabled" mask, but the values of that mask are
> combinations of:
>
> ASPM_STATE_L0S_UP
> ASPM_STATE_L0S_DW
> ASPM_STATE_L1
> ...
>
> which are defined internally in drivers/pci/pcie/aspm.c and not
> visible to the caller of pcie_aspm_enabled_mask(). If there's no need
> for the actual mask (the current caller doesn't seem to use it), maybe
> this could be a boolean?
Yes, it can be a boolean.
>
> > + mutex_unlock(&aspm_lock);
> > +
> > + return ret;
> > +}
> > +EXPORT_SYMBOL_GPL(pcie_aspm_enabled_mask);
> > +
> > #ifdef CONFIG_PCIEASPM_DEBUG
> > static ssize_t link_state_show(struct device *dev,
> > struct device_attribute *attr,
> > Index: linux-pm/include/linux/pci.h
> > ===================================================================
> > --- linux-pm.orig/include/linux/pci.h
> > +++ linux-pm/include/linux/pci.h
> > @@ -1567,8 +1567,11 @@ extern bool pcie_ports_native;
> >
> > #ifdef CONFIG_PCIEASPM
> > bool pcie_aspm_support_enabled(void);
> > +u32 pcie_aspm_enabled_mask(struct pci_dev *pci_device);
> > #else
> > static inline bool pcie_aspm_support_enabled(void) { return false; }
> > +static inline u32 pcie_aspm_enabled_mask(struct pci_dev *pci_device)
> > +{ return 0; }
> > #endif
> >
> > #ifdef CONFIG_PCIEAER
> >
> >
> >
next prev parent reply other threads:[~2019-08-08 14:48 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-25 9:51 [Regression] Commit "nvme/pci: Use host managed power state for suspend" has problems Rafael J. Wysocki
2019-07-25 14:02 ` Kai-Heng Feng
2019-07-25 16:23 ` Mario.Limonciello
2019-07-25 17:03 ` Rafael J. Wysocki
2019-07-25 17:23 ` Mario.Limonciello
2019-07-25 18:20 ` Kai-Heng Feng
2019-07-25 19:09 ` Mario.Limonciello
2019-07-30 10:45 ` Rafael J. Wysocki
2019-07-30 14:41 ` Keith Busch
2019-07-30 17:14 ` Mario.Limonciello
2019-07-30 18:50 ` Kai-Heng Feng
2019-07-30 19:19 ` Keith Busch
2019-07-30 21:05 ` Mario.Limonciello
2019-07-30 21:31 ` Keith Busch
2019-07-31 21:25 ` Rafael J. Wysocki
2019-07-31 22:19 ` Keith Busch
2019-07-31 22:33 ` Rafael J. Wysocki
2019-08-01 9:05 ` Kai-Heng Feng
2019-08-01 17:29 ` Rafael J. Wysocki
2019-08-01 19:05 ` Mario.Limonciello
2019-08-01 22:26 ` Rafael J. Wysocki
2019-08-02 10:55 ` Kai-Heng Feng
2019-08-02 11:04 ` Rafael J. Wysocki
2019-08-05 19:13 ` Kai-Heng Feng
2019-08-05 21:28 ` Rafael J. Wysocki
2019-08-06 14:02 ` Mario.Limonciello
2019-08-06 15:00 ` Rafael J. Wysocki
2019-08-07 10:29 ` Rafael J. Wysocki
2019-08-01 20:22 ` Keith Busch
2019-08-07 9:48 ` Rafael J. Wysocki
2019-08-07 10:45 ` Christoph Hellwig
2019-08-07 10:54 ` Rafael J. Wysocki
2019-08-07 9:53 ` [PATCH] nvme-pci: Do not prevent PCI bus-level PM from being used Rafael J. Wysocki
2019-08-07 10:14 ` Rafael J. Wysocki
2019-08-07 10:43 ` Christoph Hellwig
2019-08-07 14:37 ` Keith Busch
2019-08-08 8:36 ` [PATCH] nvme-pci: Allow PCI bus-level PM to be used if ASPM is disabled Rafael J. Wysocki
2019-08-08 8:48 ` Christoph Hellwig
2019-08-08 9:06 ` Rafael J. Wysocki
2019-08-08 10:03 ` [PATCH v2 0/2] " Rafael J. Wysocki
2019-08-08 10:06 ` [PATCH v2 1/2] PCI: PCIe: ASPM: Introduce pcie_aspm_enabled_mask() Rafael J. Wysocki
2019-08-08 13:15 ` Bjorn Helgaas
2019-08-08 14:48 ` Rafael J. Wysocki [this message]
2019-08-08 10:10 ` [PATCH v2 2/2] nvme-pci: Allow PCI bus-level PM to be used if ASPM is disabled Rafael J. Wysocki
2019-08-08 13:43 ` Bjorn Helgaas
2019-08-08 14:47 ` Rafael J. Wysocki
2019-08-08 17:06 ` Rafael J. Wysocki
2019-08-08 18:39 ` Bjorn Helgaas
2019-08-08 20:01 ` Keith Busch
2019-08-08 20:05 ` Mario.Limonciello
2019-08-08 20:41 ` Rafael J. Wysocki
2019-08-09 4:47 ` Bjorn Helgaas
2019-08-09 8:04 ` Rafael J. Wysocki
2019-08-08 21:51 ` [PATCH v3 0/2] " Rafael J. Wysocki
2019-08-08 21:55 ` [PATCH v3 1/2] PCI: PCIe: ASPM: Introduce pcie_aspm_enabled() Rafael J. Wysocki
2019-08-09 4:50 ` Bjorn Helgaas
2019-08-09 8:00 ` Rafael J. Wysocki
2019-10-07 22:34 ` Bjorn Helgaas
2019-10-08 9:27 ` Rafael J. Wysocki
2019-10-08 21:16 ` Bjorn Helgaas
2019-10-08 22:54 ` Rafael J. Wysocki
2019-10-09 12:49 ` Bjorn Helgaas
2019-08-08 21:58 ` [PATCH v3 2/2] nvme-pci: Allow PCI bus-level PM to be used if ASPM is disabled Rafael J. Wysocki
2019-08-08 22:13 ` [PATCH v3 0/2] " Keith Busch
2019-08-09 8:05 ` Rafael J. Wysocki
2019-08-09 14:52 ` Keith Busch
2019-07-25 16:59 ` [Regression] Commit "nvme/pci: Use host managed power state for suspend" has problems Rafael J. Wysocki
2019-07-25 14:52 ` Keith Busch
2019-07-25 19:48 ` Rafael J. Wysocki
2019-07-25 19:52 ` Keith Busch
2019-07-25 20:02 ` Rafael J. Wysocki
2019-07-26 14:02 ` Kai-Heng Feng
2019-07-27 12:55 ` Rafael J. Wysocki
2019-07-29 15:51 ` Mario.Limonciello
2019-07-29 22:05 ` Rafael J. Wysocki
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