From d544d75ac96aa1b0a8a378826626a0fbd8ce4380 Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Fri, 17 Jul 2015 15:15:19 -0500 Subject: [PATCH] PCI: Embed ATS info directly into struct pci_dev The pci_ats struct is small and will get smaller, so I don't think it's worth allocating it separately from the pci_dev struct. Embed the ATS fields directly into struct pci_dev. Signed-off-by: Bjorn Helgaas Reviewed-by: Joerg Roedel --- drivers/pci/ats.c | 61 +++++++++++++++++-------------------------------- drivers/pci/remove.c | 1 - include/linux/pci-ats.h | 10 +------- include/linux/pci.h | 8 ++++--- 4 files changed, 27 insertions(+), 53 deletions(-) diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c index 2026f53..690ae6e 100644 --- a/drivers/pci/ats.c +++ b/drivers/pci/ats.c @@ -21,29 +21,15 @@ static void ats_alloc_one(struct pci_dev *dev) { int pos; u16 cap; - struct pci_ats *ats; pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ATS); if (!pos) return; - ats = kzalloc(sizeof(*ats), GFP_KERNEL); - if (!ats) { - dev_warn(&dev->dev, "can't allocate space for ATS state\n"); - return; - } - - ats->pos = pos; - pci_read_config_word(dev, pos + PCI_ATS_CAP, &cap); - ats->qdep = PCI_ATS_CAP_QDEP(cap) ? PCI_ATS_CAP_QDEP(cap) : + dev->ats_cap = pos; + pci_read_config_word(dev, dev->ats_cap + PCI_ATS_CAP, &cap); + dev->ats_qdep = PCI_ATS_CAP_QDEP(cap) ? PCI_ATS_CAP_QDEP(cap) : PCI_ATS_MAX_QDEP; - dev->ats = ats; -} - -static void ats_free_one(struct pci_dev *dev) -{ - kfree(dev->ats); - dev->ats = NULL; } void pci_ats_init(struct pci_dev *dev) @@ -51,11 +37,6 @@ void pci_ats_init(struct pci_dev *dev) ats_alloc_one(dev); } -void pci_ats_free(struct pci_dev *dev) -{ - ats_free_one(dev); -} - /** * pci_enable_ats - enable the ATS capability * @dev: the PCI device @@ -67,9 +48,9 @@ int pci_enable_ats(struct pci_dev *dev, int ps) { u16 ctrl; - BUG_ON(dev->ats && dev->ats->is_enabled); + BUG_ON(dev->ats_cap && dev->ats_enabled); - if (!dev->ats) + if (!dev->ats_cap) return -EINVAL; if (ps < PCI_ATS_MIN_STU) @@ -83,17 +64,17 @@ int pci_enable_ats(struct pci_dev *dev, int ps) if (dev->is_virtfn) { struct pci_dev *pdev = dev->physfn; - if (pdev->ats->stu != ps) + if (pdev->ats_stu != ps) return -EINVAL; - atomic_inc(&pdev->ats->ref_cnt); /* count enabled VFs */ + atomic_inc(&pdev->ats_ref_cnt); /* count enabled VFs */ } else { - dev->ats->stu = ps; - ctrl |= PCI_ATS_CTRL_STU(dev->ats->stu - PCI_ATS_MIN_STU); + dev->ats_stu = ps; + ctrl |= PCI_ATS_CTRL_STU(dev->ats_stu - PCI_ATS_MIN_STU); } - pci_write_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, ctrl); + pci_write_config_word(dev, dev->ats_cap + PCI_ATS_CTRL, ctrl); - dev->ats->is_enabled = 1; + dev->ats_enabled = 1; return 0; } EXPORT_SYMBOL_GPL(pci_enable_ats); @@ -106,22 +87,22 @@ void pci_disable_ats(struct pci_dev *dev) { u16 ctrl; - BUG_ON(!dev->ats || !dev->ats->is_enabled); + BUG_ON(!dev->ats_cap || !dev->ats_enabled); - if (atomic_read(&dev->ats->ref_cnt)) + if (atomic_read(&dev->ats_ref_cnt)) return; /* VFs still enabled */ if (dev->is_virtfn) { struct pci_dev *pdev = dev->physfn; - atomic_dec(&pdev->ats->ref_cnt); + atomic_dec(&pdev->ats_ref_cnt); } - pci_read_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, &ctrl); + pci_read_config_word(dev, dev->ats_cap + PCI_ATS_CTRL, &ctrl); ctrl &= ~PCI_ATS_CTRL_ENABLE; - pci_write_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, ctrl); + pci_write_config_word(dev, dev->ats_cap + PCI_ATS_CTRL, ctrl); - dev->ats->is_enabled = 0; + dev->ats_enabled = 0; } EXPORT_SYMBOL_GPL(pci_disable_ats); @@ -136,8 +117,8 @@ void pci_restore_ats_state(struct pci_dev *dev) ctrl = PCI_ATS_CTRL_ENABLE; if (!dev->is_virtfn) - ctrl |= PCI_ATS_CTRL_STU(dev->ats->stu - PCI_ATS_MIN_STU); - pci_write_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, ctrl); + ctrl |= PCI_ATS_CTRL_STU(dev->ats_stu - PCI_ATS_MIN_STU); + pci_write_config_word(dev, dev->ats_cap + PCI_ATS_CTRL, ctrl); } EXPORT_SYMBOL_GPL(pci_restore_ats_state); @@ -158,8 +139,8 @@ int pci_ats_queue_depth(struct pci_dev *dev) if (dev->is_virtfn) return 0; - if (dev->ats) - return dev->ats->qdep; + if (dev->ats_cap) + return dev->ats_qdep; return -ENODEV; } diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c index 27617b8..8a280e9 100644 --- a/drivers/pci/remove.c +++ b/drivers/pci/remove.c @@ -26,7 +26,6 @@ static void pci_stop_dev(struct pci_dev *dev) dev->is_added = 0; } - pci_ats_free(dev); if (dev->bus->self) pcie_aspm_exit_link_state(dev); } diff --git a/include/linux/pci-ats.h b/include/linux/pci-ats.h index e2dcc2f..5d81d47 100644 --- a/include/linux/pci-ats.h +++ b/include/linux/pci-ats.h @@ -4,14 +4,6 @@ #include /* Address Translation Service */ -struct pci_ats { - int pos; /* capability position */ - int stu; /* Smallest Translation Unit */ - int qdep; /* Invalidate Queue Depth */ - atomic_t ref_cnt; /* number of VFs with ATS enabled */ - unsigned int is_enabled:1; /* Enable bit is set */ -}; - #ifdef CONFIG_PCI_ATS int pci_enable_ats(struct pci_dev *dev, int ps); @@ -26,7 +18,7 @@ int pci_ats_queue_depth(struct pci_dev *dev); */ static inline int pci_ats_enabled(struct pci_dev *dev) { - return dev->ats && dev->ats->is_enabled; + return dev->ats_cap && dev->ats_enabled; } #else /* CONFIG_PCI_ATS */ diff --git a/include/linux/pci.h b/include/linux/pci.h index 1817819..8bc16b5 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -343,6 +343,7 @@ struct pci_dev { unsigned int msi_enabled:1; unsigned int msix_enabled:1; unsigned int ari_enabled:1; /* ARI forwarding */ + unsigned int ats_enabled:1; /* Address Translation Service */ unsigned int is_managed:1; unsigned int needs_freset:1; /* Dev requires fundamental reset */ unsigned int state_saved:1; @@ -375,7 +376,10 @@ struct pci_dev { struct pci_sriov *sriov; /* SR-IOV capability related */ struct pci_dev *physfn; /* the PF this VF is associated with */ }; - struct pci_ats *ats; /* Address Translation Service */ + int ats_cap; /* ATS Capability offset */ + int ats_stu; /* ATS Smallest Translation Unit */ + int ats_qdep; /* ATS Invalidate Queue Depth */ + atomic_t ats_ref_cnt; /* number of VFs with ATS enabled */ #endif phys_addr_t rom; /* Physical address of ROM if it's not from the BAR */ size_t romlen; /* Length of ROM if it's not from the BAR */ @@ -1297,10 +1301,8 @@ void ht_destroy_irq(unsigned int irq); #ifdef CONFIG_PCI_ATS /* Address Translation Service */ void pci_ats_init(struct pci_dev *dev); -void pci_ats_free(struct pci_dev *dev); #else static inline void pci_ats_init(struct pci_dev *dev) { } -static inline void pci_ats_free(struct pci_dev *dev) { } #endif void pci_cfg_access_lock(struct pci_dev *dev); -- 2.7.4