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Date: Wed, 22 Sep 2021 23:30:58 +0200
From: Ferry Toth <fntoth@...il.com>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>,
Linux PCI <linux-pci@...r.kernel.org>
Cc: Linux ACPI <linux-acpi@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Bjorn Helgaas <helgaas@...nel.org>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: Re: [PATCH v2 2/7] PCI: ACPI: PM: Do not use pci_platform_pm_ops for
ACPI
Hi,
Op 20-09-2021 om 21:17 schreef Rafael J. Wysocki:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> Using struct pci_platform_pm_ops for ACPI adds unnecessary
> indirection to the interactions between the PCI core and ACPI PM,
> which is also subject to retpolines.
>
> Moreover, it is not particularly clear from the current code that,
> as far as PCI PM is concerned, "platform" really means just ACPI
> except for the special casess when Intel MID PCI PM is used or when
> ACPI support is disabled (through the kernel config or command line,
> or because there are no usable ACPI tables on the system).
>
> To address the above, rework the PCI PM code to invoke ACPI PM
> functions directly as needed and drop the acpi_pci_platform_pm
> object that is not necessary any more.
>
> Accordingly, update some of the ACPI PM functions in question to do
> extra checks in case the ACPI support is disabled (which previously
> was taken care of by avoiding to set the pci_platform_ops pointer
> in those cases).
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
>
> v1 -> v2:
> * Rebase on top of the new [1/7] and move dropping struct
> pci_platform_pm_ops to a separate patch.
I wanted to test this series on 5.15-rc2 but this patch 2/7 doesn't
apply (after 1/7 applied). Should I apply this on another tree?
> ---
> drivers/pci/pci-acpi.c | 42 ++++++++++++++++++++----------------------
> drivers/pci/pci.c | 22 +++++++++-------------
> drivers/pci/pci.h | 38 +++++++++++++++++++++++++++++++++++++-
> 3 files changed, 66 insertions(+), 36 deletions(-)
>
> Index: linux-pm/drivers/pci/pci-acpi.c
> ===================================================================
> --- linux-pm.orig/drivers/pci/pci-acpi.c
> +++ linux-pm/drivers/pci/pci-acpi.c
> @@ -906,10 +906,13 @@ acpi_status pci_acpi_add_pm_notifier(str
> * choose highest power _SxD or any lower power
> */
>
> -static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
> +pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
> {
> int acpi_state, d_max;
>
> + if (acpi_pci_disabled)
> + return PCI_POWER_ERROR;
> +
> if (pdev->no_d3cold)
> d_max = ACPI_STATE_D3_HOT;
> else
> @@ -965,7 +968,7 @@ int pci_dev_acpi_reset(struct pci_dev *d
> return 0;
> }
>
> -static bool acpi_pci_power_manageable(struct pci_dev *dev)
> +bool acpi_pci_power_manageable(struct pci_dev *dev)
> {
> struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
>
> @@ -974,13 +977,13 @@ static bool acpi_pci_power_manageable(st
> return acpi_device_power_manageable(adev);
> }
>
> -static bool acpi_pci_bridge_d3(struct pci_dev *dev)
> +bool acpi_pci_bridge_d3(struct pci_dev *dev)
> {
> const union acpi_object *obj;
> struct acpi_device *adev;
> struct pci_dev *rpdev;
>
> - if (!dev->is_hotplug_bridge)
> + if (acpi_pci_disabled || !dev->is_hotplug_bridge)
> return false;
>
> /* Assume D3 support if the bridge is power-manageable by ACPI. */
> @@ -1008,7 +1011,7 @@ static bool acpi_pci_bridge_d3(struct pc
> return obj->integer.value == 1;
> }
>
> -static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
> +int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
> {
> struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
> static const u8 state_conv[] = {
> @@ -1046,7 +1049,7 @@ static int acpi_pci_set_power_state(stru
> return error;
> }
>
> -static pci_power_t acpi_pci_get_power_state(struct pci_dev *dev)
> +pci_power_t acpi_pci_get_power_state(struct pci_dev *dev)
> {
> struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
> static const pci_power_t state_conv[] = {
> @@ -1068,7 +1071,7 @@ static pci_power_t acpi_pci_get_power_st
> return state_conv[state];
> }
>
> -static void acpi_pci_refresh_power_state(struct pci_dev *dev)
> +void acpi_pci_refresh_power_state(struct pci_dev *dev)
> {
> struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
>
> @@ -1093,17 +1096,23 @@ static int acpi_pci_propagate_wakeup(str
> return 0;
> }
>
> -static int acpi_pci_wakeup(struct pci_dev *dev, bool enable)
> +int acpi_pci_wakeup(struct pci_dev *dev, bool enable)
> {
> + if (acpi_pci_disabled)
> + return 0;
> +
> if (acpi_pm_device_can_wakeup(&dev->dev))
> return acpi_pm_set_device_wakeup(&dev->dev, enable);
>
> return acpi_pci_propagate_wakeup(dev->bus, enable);
> }
>
> -static bool acpi_pci_need_resume(struct pci_dev *dev)
> +bool acpi_pci_need_resume(struct pci_dev *dev)
> {
> - struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
> + struct acpi_device *adev;
> +
> + if (acpi_pci_disabled)
> + return false;
>
> /*
> * In some cases (eg. Samsung 305V4A) leaving a bridge in suspend over
> @@ -1118,6 +1127,7 @@ static bool acpi_pci_need_resume(struct
> if (!adev || !acpi_device_power_manageable(adev))
> return false;
>
> + adev = ACPI_COMPANION(&dev->dev);
> if (adev->wakeup.flags.valid &&
> device_may_wakeup(&dev->dev) != !!adev->wakeup.prepare_count)
> return true;
> @@ -1128,17 +1138,6 @@ static bool acpi_pci_need_resume(struct
> return !!adev->power.flags.dsw_present;
> }
>
> -static const struct pci_platform_pm_ops acpi_pci_platform_pm = {
> - .bridge_d3 = acpi_pci_bridge_d3,
> - .is_manageable = acpi_pci_power_manageable,
> - .set_state = acpi_pci_set_power_state,
> - .get_state = acpi_pci_get_power_state,
> - .refresh_state = acpi_pci_refresh_power_state,
> - .choose_state = acpi_pci_choose_state,
> - .set_wakeup = acpi_pci_wakeup,
> - .need_resume = acpi_pci_need_resume,
> -};
> -
> void acpi_pci_add_bus(struct pci_bus *bus)
> {
> union acpi_object *obj;
> @@ -1448,7 +1447,6 @@ static int __init acpi_pci_init(void)
> if (acpi_pci_disabled)
> return 0;
>
> - pci_set_platform_pm(&acpi_pci_platform_pm);
> acpi_pci_slot_init();
> acpiphp_init();
>
> Index: linux-pm/drivers/pci/pci.h
> ===================================================================
> --- linux-pm.orig/drivers/pci/pci.h
> +++ linux-pm/drivers/pci/pci.h
> @@ -725,17 +725,53 @@ int pci_acpi_program_hp_params(struct pc
> extern const struct attribute_group pci_dev_acpi_attr_group;
> void pci_set_acpi_fwnode(struct pci_dev *dev);
> int pci_dev_acpi_reset(struct pci_dev *dev, bool probe);
> +bool acpi_pci_power_manageable(struct pci_dev *dev);
> +bool acpi_pci_bridge_d3(struct pci_dev *dev);
> +int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state);
> +pci_power_t acpi_pci_get_power_state(struct pci_dev *dev);
> +void acpi_pci_refresh_power_state(struct pci_dev *dev);
> +int acpi_pci_wakeup(struct pci_dev *dev, bool enable);
> +bool acpi_pci_need_resume(struct pci_dev *dev);
> +pci_power_t acpi_pci_choose_state(struct pci_dev *pdev);
> #else
> static inline int pci_dev_acpi_reset(struct pci_dev *dev, bool probe)
> {
> return -ENOTTY;
> }
> -
> static inline void pci_set_acpi_fwnode(struct pci_dev *dev) {}
> static inline int pci_acpi_program_hp_params(struct pci_dev *dev)
> {
> return -ENODEV;
> }
> +static inline bool acpi_pci_power_manageable(struct pci_dev *dev)
> +{
> + return false;
> +}
> +static inline bool acpi_pci_bridge_d3(struct pci_dev *dev)
> +{
> + return false;
> +}
> +static inline int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
> +{
> + return -ENODEV;
> +}
> +static inline pci_power_t acpi_pci_get_power_state(struct pci_dev *dev)
> +{
> + return PCI_UNKNOWN;
> +}
> +static inline void acpi_pci_refresh_power_state(struct pci_dev *dev) {}
> +static inline int acpi_pci_wakeup(struct pci_dev *dev, bool enable)
> +{
> + return -ENODEV;
> +}
> +static inline bool acpi_pci_need_resume(struct pci_dev *dev)
> +{
> + return false;
> +}
> +static inline pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
> +{
> + return PCI_POWER_ERROR;
> +}
> #endif
>
> #ifdef CONFIG_PCIEASPM
> Index: linux-pm/drivers/pci/pci.c
> ===================================================================
> --- linux-pm.orig/drivers/pci/pci.c
> +++ linux-pm/drivers/pci/pci.c
> @@ -988,7 +988,7 @@ static inline bool platform_pci_power_ma
> if (pci_use_mid_pm())
> return true;
>
> - return pci_platform_pm ? pci_platform_pm->is_manageable(dev) : false;
> + return acpi_pci_power_manageable(dev);
> }
>
> static inline int platform_pci_set_power_state(struct pci_dev *dev,
> @@ -997,7 +997,7 @@ static inline int platform_pci_set_power
> if (pci_use_mid_pm())
> return mid_pci_set_power_state(dev, t);
>
> - return pci_platform_pm ? pci_platform_pm->set_state(dev, t) : -ENOSYS;
> + return acpi_pci_set_power_state(dev, t);
> }
>
> static inline pci_power_t platform_pci_get_power_state(struct pci_dev *dev)
> @@ -1005,13 +1005,13 @@ static inline pci_power_t platform_pci_g
> if (pci_use_mid_pm())
> return mid_pci_get_power_state(dev);
>
> - return pci_platform_pm ? pci_platform_pm->get_state(dev) : PCI_UNKNOWN;
> + return acpi_pci_get_power_state(dev);
> }
>
> static inline void platform_pci_refresh_power_state(struct pci_dev *dev)
> {
> - if (!pci_use_mid_pm() && pci_platform_pm && pci_platform_pm->refresh_state)
> - pci_platform_pm->refresh_state(dev);
> + if (!pci_use_mid_pm())
> + acpi_pci_refresh_power_state(dev);
> }
>
> static inline pci_power_t platform_pci_choose_state(struct pci_dev *dev)
> @@ -1019,8 +1019,7 @@ static inline pci_power_t platform_pci_c
> if (pci_use_mid_pm())
> return PCI_POWER_ERROR;
>
> - return pci_platform_pm ?
> - pci_platform_pm->choose_state(dev) : PCI_POWER_ERROR;
> + return acpi_pci_choose_state(dev);
> }
>
> static inline int platform_pci_set_wakeup(struct pci_dev *dev, bool enable)
> @@ -1028,8 +1027,7 @@ static inline int platform_pci_set_wakeu
> if (pci_use_mid_pm())
> return PCI_POWER_ERROR;
>
> - return pci_platform_pm ?
> - pci_platform_pm->set_wakeup(dev, enable) : -ENODEV;
> + return acpi_pci_wakeup(dev, enable);
> }
>
> static inline bool platform_pci_need_resume(struct pci_dev *dev)
> @@ -1037,7 +1035,7 @@ static inline bool platform_pci_need_res
> if (pci_use_mid_pm())
> return false;
>
> - return pci_platform_pm ? pci_platform_pm->need_resume(dev) : false;
> + return acpi_pci_need_resume(dev);
> }
>
> static inline bool platform_pci_bridge_d3(struct pci_dev *dev)
> @@ -1045,9 +1043,7 @@ static inline bool platform_pci_bridge_d
> if (pci_use_mid_pm())
> return false;
>
> - if (pci_platform_pm && pci_platform_pm->bridge_d3)
> - return pci_platform_pm->bridge_d3(dev);
> - return false;
> + return acpi_pci_bridge_d3(dev);
> }
>
> /**
>
>
>
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