From 39850ed51062f89cd46214a16aaafba5ca49fd6c Mon Sep 17 00:00:00 2001 From: "David E. Box" Date: Mon, 7 Dec 2020 14:39:50 -0800 Subject: [PATCH] PCI/PTM: Save/restore Precision Time Measurement Capability for suspend/resume The PCI subsystem does not currently save and restore the configuration space for the Precision Time Measurement (PTM) Extended Capability leading to the possibility of the feature returning disabled on S3 resume. This has been observed on Intel Coffee Lake desktops. Add save/restore of the PTM control register. This saves the PTM Enable, Root Select, and Effective Granularity bits. Suggested-by: Rafael J. Wysocki Link: https://lore.kernel.org/r/20201207223951.19667-1-david.e.box@linux.intel.com Signed-off-by: David E. Box Signed-off-by: Bjorn Helgaas --- drivers/pci/pci.c | 2 ++ drivers/pci/pci.h | 8 ++++++++ drivers/pci/pcie/ptm.c | 43 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 53 insertions(+) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index e578d34095e9..12ba6351c05b 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1566,6 +1566,7 @@ int pci_save_state(struct pci_dev *dev) pci_save_ltr_state(dev); pci_save_dpc_state(dev); pci_save_aer_state(dev); + pci_save_ptm_state(dev); return pci_save_vc_state(dev); } EXPORT_SYMBOL(pci_save_state); @@ -1677,6 +1678,7 @@ void pci_restore_state(struct pci_dev *dev) pci_restore_vc_state(dev); pci_restore_rebar_state(dev); pci_restore_dpc_state(dev); + pci_restore_ptm_state(dev); pci_aer_clear_status(dev); pci_restore_aer_state(dev); diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index f86cae9aa1f4..e0f9e7259e47 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -516,6 +516,14 @@ static inline int pci_iov_bus_range(struct pci_bus *bus) #endif /* CONFIG_PCI_IOV */ +#ifdef CONFIG_PCIE_PTM +void pci_save_ptm_state(struct pci_dev *dev); +void pci_restore_ptm_state(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) { } +#endif + unsigned long pci_cardbus_resource_alignment(struct resource *); static inline resource_size_t pci_resource_alignment(struct pci_dev *dev, diff --git a/drivers/pci/pcie/ptm.c b/drivers/pci/pcie/ptm.c index 357a454cafa0..6b24a1c9327a 100644 --- a/drivers/pci/pcie/ptm.c +++ b/drivers/pci/pcie/ptm.c @@ -29,6 +29,47 @@ static void pci_ptm_info(struct pci_dev *dev) dev->ptm_root ? " (root)" : "", clock_desc); } +void pci_save_ptm_state(struct pci_dev *dev) +{ + int ptm; + struct pci_cap_saved_state *save_state; + u16 *cap; + + if (!pci_is_pcie(dev)) + return; + + ptm = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_PTM); + if (!ptm) + return; + + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_PTM); + if (!save_state) { + pci_err(dev, "no suspend buffer for PTM\n"); + return; + } + + cap = (u16 *)&save_state->cap.data[0]; + pci_read_config_word(dev, ptm + PCI_PTM_CTRL, cap); +} + +void pci_restore_ptm_state(struct pci_dev *dev) +{ + struct pci_cap_saved_state *save_state; + int ptm; + u16 *cap; + + if (!pci_is_pcie(dev)) + return; + + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_PTM); + ptm = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_PTM); + if (!save_state || !ptm) + return; + + cap = (u16 *)&save_state->cap.data[0]; + pci_write_config_word(dev, ptm + PCI_PTM_CTRL, *cap); +} + void pci_ptm_init(struct pci_dev *dev) { int pos; @@ -65,6 +106,8 @@ void pci_ptm_init(struct pci_dev *dev) if (!pos) return; + pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_PTM, sizeof(u16)); + pci_read_config_dword(dev, pos + PCI_PTM_CAP, &cap); local_clock = (cap & PCI_PTM_GRANULARITY_MASK) >> 8;