From: Bjorn Helgaas <helgaas@kernel.org>
To: Kai-Heng Feng <kai.heng.feng@canonical.com>,
Rajvi Jingar <rajvi.jingar@linux.intel.com>,
"Rafael J . Wysocki" <rafael@kernel.org>
Cc: Koba Ko <koba.ko@canonical.com>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
"David E . Box" <david.e.box@linux.intel.com>,
Sathyanarayanan Kuppuswamy
<sathyanarayanan.kuppuswamy@linux.intel.com>,
linux-pci@vger.kernel.org, linux-pm@vger.kernel.org,
linux-kernel@vger.kernel.org, Bjorn Helgaas <bhelgaas@google.com>
Subject: [PATCH v3 05/10] PCI/PTM: Add pci_disable_ptm() wrapper
Date: Tue, 6 Sep 2022 17:23:46 -0500 [thread overview]
Message-ID: <20220906222351.64760-6-helgaas@kernel.org> (raw)
In-Reply-To: <20220906222351.64760-1-helgaas@kernel.org>
From: Bjorn Helgaas <bhelgaas@google.com>
Implement pci_disable_ptm() as a wrapper around an internal
__pci_disable_ptm() that we can use during suspend to disable PTM without
clearing dev->ptm_enabled. A future commit will re-enable PTM during
resume when dev->ptm_enabled is set.
Export pci_disable_ptm(), which *does* clear dev->ptm_enabled, for use by
drivers that want to disable PTM.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
drivers/pci/pci.h | 2 --
drivers/pci/pcie/ptm.c | 9 ++++++++-
include/linux/pci.h | 2 ++
3 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 785f31086313..91a465460d0f 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -507,11 +507,9 @@ static inline int pci_iov_bus_range(struct pci_bus *bus)
#ifdef CONFIG_PCIE_PTM
void pci_save_ptm_state(struct pci_dev *dev);
void pci_restore_ptm_state(struct pci_dev *dev);
-void pci_disable_ptm(struct pci_dev *dev);
#else
static inline void pci_save_ptm_state(struct pci_dev *dev) { }
static inline void pci_restore_ptm_state(struct pci_dev *dev) { }
-static inline void pci_disable_ptm(struct pci_dev *dev) { }
#endif
unsigned long pci_cardbus_resource_alignment(struct resource *);
diff --git a/drivers/pci/pcie/ptm.c b/drivers/pci/pcie/ptm.c
index ac51cd84793f..762299984469 100644
--- a/drivers/pci/pcie/ptm.c
+++ b/drivers/pci/pcie/ptm.c
@@ -29,7 +29,7 @@ static void pci_ptm_info(struct pci_dev *dev)
dev->ptm_root ? " (root)" : "", clock_desc);
}
-void pci_disable_ptm(struct pci_dev *dev)
+static void __pci_disable_ptm(struct pci_dev *dev)
{
int ptm = dev->ptm_cap;
u16 ctrl;
@@ -42,6 +42,13 @@ void pci_disable_ptm(struct pci_dev *dev)
pci_write_config_word(dev, ptm + PCI_PTM_CTRL, ctrl);
}
+void pci_disable_ptm(struct pci_dev *dev)
+{
+ __pci_disable_ptm(dev);
+ dev->ptm_enabled = 0;
+}
+EXPORT_SYMBOL(pci_disable_ptm);
+
void pci_save_ptm_state(struct pci_dev *dev)
{
int ptm = dev->ptm_cap;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 54be939023a3..cb5f796e3319 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1678,10 +1678,12 @@ bool pci_ats_disabled(void);
#ifdef CONFIG_PCIE_PTM
int pci_enable_ptm(struct pci_dev *dev, u8 *granularity);
+void pci_disable_ptm(struct pci_dev *dev);
bool pcie_ptm_enabled(struct pci_dev *dev);
#else
static inline int pci_enable_ptm(struct pci_dev *dev, u8 *granularity)
{ return -EINVAL; }
+static inline void pci_disable_ptm(struct pci_dev *dev) { }
static inline bool pcie_ptm_enabled(struct pci_dev *dev)
{ return false; }
#endif
--
2.25.1
next prev parent reply other threads:[~2022-09-06 22:24 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-06 22:23 [PATCH v3 00/10] PCI/PM: Always disable PTM for all devices during suspend Bjorn Helgaas
2022-09-06 22:23 ` [PATCH v3 01/10] PCI/PTM: Preserve PTM Root Select Bjorn Helgaas
2022-09-06 22:23 ` [PATCH v3 02/10] PCI/PTM: Cache PTM Capability offset Bjorn Helgaas
2022-09-06 23:18 ` Sathyanarayanan Kuppuswamy
2022-09-07 15:49 ` Bjorn Helgaas
2022-09-06 22:23 ` [PATCH v3 03/10] PCI/PTM: Add pci_upstream_ptm() helper Bjorn Helgaas
2022-09-06 22:23 ` [PATCH v3 04/10] PCI/PTM: Separate configuration and enable Bjorn Helgaas
2022-09-07 5:25 ` Mika Westerberg
2022-09-06 22:23 ` Bjorn Helgaas [this message]
2022-09-07 5:28 ` [PATCH v3 05/10] PCI/PTM: Add pci_disable_ptm() wrapper Mika Westerberg
2022-09-07 21:12 ` Bjorn Helgaas
2022-09-06 22:23 ` [PATCH v3 06/10] PCI/PTM: Add pci_enable_ptm() wrapper Bjorn Helgaas
2022-09-07 5:29 ` Mika Westerberg
2022-09-08 20:18 ` Sathyanarayanan Kuppuswamy
2022-09-06 22:23 ` [PATCH v3 07/10] PCI/PTM: Add suspend/resume Bjorn Helgaas
2022-09-07 5:30 ` Mika Westerberg
2022-09-07 16:44 ` Bjorn Helgaas
2022-09-06 22:23 ` [PATCH v3 08/10] PCI/PTM: Move pci_ptm_info() body into its only caller Bjorn Helgaas
2022-09-06 22:23 ` [PATCH v3 09/10] PCI/PTM: Reorder functions in logical order Bjorn Helgaas
2022-09-08 20:15 ` Sathyanarayanan Kuppuswamy
2022-09-08 20:58 ` Bjorn Helgaas
2022-09-06 22:23 ` [PATCH v3 10/10] PCI/PM: Always disable PTM for all devices during suspend Bjorn Helgaas
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