Delete struct pci_cap_saved_state, struct pci_cap_saved_data, pci_dev.saved_cap_space and the helpers that managed them. Every capability now saves its registers in the offset-indexed capability store, so nothing is left to find, allocate or free.
Drop pci_free_cap_save_buffers() from pci_release_capabilities(); pci_saved_caps_release() already frees the one remaining allocation. pci_store_saved_state() and pci_load_saved_state() no longer have to append and consume the records of the capabilities that still had a buffer, so the blob they exchange is now just the saved DWORDs. Signed-off-by: David Matlack <[email protected]> --- drivers/pci/pci.c | 136 +------------------------------------------- drivers/pci/pci.h | 19 ------- drivers/pci/probe.c | 1 - include/linux/pci.h | 1 - 4 files changed, 1 insertion(+), 156 deletions(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index ab1e1d6847fc..d2a9718b6a65 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1802,28 +1802,6 @@ static const u16 pcie_saved_regs[] = { PCI_EXP_SLTCTL2, }; -static struct pci_cap_saved_state *_pci_find_saved_cap(struct pci_dev *pci_dev, - u16 cap, bool extended) -{ - struct pci_cap_saved_state *tmp; - - hlist_for_each_entry(tmp, &pci_dev->saved_cap_space, next) { - if (tmp->cap.cap_extended == extended && tmp->cap.cap_nr == cap) - return tmp; - } - return NULL; -} - -struct pci_cap_saved_state *pci_find_saved_cap(struct pci_dev *dev, char cap) -{ - return _pci_find_saved_cap(dev, cap, false); -} - -struct pci_cap_saved_state *pci_find_saved_ext_cap(struct pci_dev *dev, u16 cap) -{ - return _pci_find_saved_cap(dev, cap, true); -} - static void pci_reserve_pcie_state(struct pci_dev *dev) { unsigned int i; @@ -2017,32 +1995,12 @@ EXPORT_SYMBOL(pci_restore_state); * * Laid out so that the position of every value is described by the device's * configuration space rather than by the kernel. - * - * Capabilities that have not moved to the saved capability store yet keep - * their own buffer, and their records trail @dword_val until the last of - * those buffers goes away. Both areas vary in length and only one of them - * can be a flexible array member, so the records are reached with - * pci_saved_state_records() rather than declared here. */ struct pci_saved_state { unsigned long dword_map[BITS_TO_LONGS(PCI_CFG_SPACE_EXP_DWORDS)]; u32 dword_val[]; - /* struct pci_cap_saved_data cap[] follows dword_val */ }; -/* - * The records that follow the saved DWORDs, one per capability that still has - * its own save buffer, terminated by an empty record. - */ -static struct pci_cap_saved_data * -pci_saved_state_records(struct pci_saved_state *state) -{ - unsigned int nr_dwords = bitmap_weight(state->dword_map, - PCI_CFG_SPACE_EXP_DWORDS); - - return (struct pci_cap_saved_data *)&state->dword_val[nr_dwords]; -} - /** * pci_store_saved_state - Allocate and return an opaque struct containing * the device saved state. @@ -2054,11 +2012,8 @@ struct pci_saved_state *pci_store_saved_state(struct pci_dev *dev) { DECLARE_BITMAP(map, PCI_CFG_SPACE_EXP_DWORDS); struct pci_saved_caps *caps = &dev->saved_caps; - struct pci_cap_saved_state *tmp; - struct pci_cap_saved_data *cap; struct pci_saved_state *state; unsigned int dword, nr_dwords, i = 0; - size_t size; if (!dev->state_saved) return NULL; @@ -2070,14 +2025,7 @@ struct pci_saved_state *pci_store_saved_state(struct pci_dev *dev) nr_dwords = bitmap_weight(map, PCI_CFG_SPACE_EXP_DWORDS); - size = struct_size(state, dword_val, nr_dwords); - - /* Room for the buffers that are left, and for the terminator */ - size += sizeof(struct pci_cap_saved_data); - hlist_for_each_entry(tmp, &dev->saved_cap_space, next) - size += sizeof(struct pci_cap_saved_data) + tmp->cap.size; - - state = kzalloc(size, GFP_KERNEL); + state = kzalloc(struct_size(state, dword_val, nr_dwords), GFP_KERNEL); if (!state) return NULL; @@ -2092,15 +2040,6 @@ struct pci_saved_state *pci_store_saved_state(struct pci_dev *dev) pci_read_saved_cap_dword(dev, dword * sizeof(u32), val); } - cap = pci_saved_state_records(state); - hlist_for_each_entry(tmp, &dev->saved_cap_space, next) { - size_t len = sizeof(struct pci_cap_saved_data) + tmp->cap.size; - - memcpy(cap, &tmp->cap, len); - cap = (struct pci_cap_saved_data *)((u8 *)cap + len); - } - /* Empty record terminates the list */ - return state; } EXPORT_SYMBOL_GPL(pci_store_saved_state); @@ -2113,7 +2052,6 @@ EXPORT_SYMBOL_GPL(pci_store_saved_state); int pci_load_saved_state(struct pci_dev *dev, struct pci_saved_state *state) { - struct pci_cap_saved_data *cap; unsigned int dword, i = 0; dev->state_saved = false; @@ -2140,19 +2078,6 @@ int pci_load_saved_state(struct pci_dev *dev, pci_write_saved_cap_dword(dev, off, val); } - cap = pci_saved_state_records(state); - while (cap->size) { - struct pci_cap_saved_state *tmp; - - tmp = _pci_find_saved_cap(dev, cap->cap_nr, cap->cap_extended); - if (!tmp || tmp->cap.size != cap->size) - return -EINVAL; - - memcpy(tmp->cap.data, cap->data, tmp->cap.size); - cap = (struct pci_cap_saved_data *)((u8 *)cap + - sizeof(struct pci_cap_saved_data) + cap->size); - } - dev->state_saved = true; return 0; } @@ -3652,56 +3577,6 @@ void pci_ea_init(struct pci_dev *dev) offset = pci_ea_read(dev, offset); } -static void pci_add_saved_cap(struct pci_dev *pci_dev, - struct pci_cap_saved_state *new_cap) -{ - hlist_add_head(&new_cap->next, &pci_dev->saved_cap_space); -} - -/** - * _pci_add_cap_save_buffer - allocate buffer for saving given - * capability registers - * @dev: the PCI device - * @cap: the capability to allocate the buffer for - * @extended: Standard or Extended capability ID - * @size: requested size of the buffer - */ -static int _pci_add_cap_save_buffer(struct pci_dev *dev, u16 cap, - bool extended, unsigned int size) -{ - int pos; - struct pci_cap_saved_state *save_state; - - if (extended) - pos = pci_find_ext_capability(dev, cap); - else - pos = pci_find_capability(dev, cap); - - if (!pos) - return 0; - - save_state = kzalloc(sizeof(*save_state) + size, GFP_KERNEL); - if (!save_state) - return -ENOMEM; - - save_state->cap.cap_nr = cap; - save_state->cap.cap_extended = extended; - save_state->cap.size = size; - pci_add_saved_cap(dev, save_state); - - return 0; -} - -int pci_add_cap_save_buffer(struct pci_dev *dev, char cap, unsigned int size) -{ - return _pci_add_cap_save_buffer(dev, cap, false, size); -} - -int pci_add_ext_cap_save_buffer(struct pci_dev *dev, u16 cap, unsigned int size) -{ - return _pci_add_cap_save_buffer(dev, cap, true, size); -} - /** * pci_reserve_saved_caps - reserve room to save capability registers * @dev: the PCI device @@ -3715,15 +3590,6 @@ void pci_reserve_saved_caps(struct pci_dev *dev) pci_reserve_vc_state(dev); } -void pci_free_cap_save_buffers(struct pci_dev *dev) -{ - struct pci_cap_saved_state *tmp; - struct hlist_node *n; - - hlist_for_each_entry_safe(tmp, n, &dev->saved_cap_space, next) - kfree(tmp); -} - /** * pci_configure_ari - enable or disable ARI forwarding * @dev: the PCI device diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 5a03561515ee..bc92b037b9d1 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -237,26 +237,7 @@ int pci_bridge_secondary_bus_reset(struct pci_dev *dev); int pci_bus_error_reset(struct pci_dev *dev); int pci_try_reset_bridge(struct pci_dev *bridge); -struct pci_cap_saved_data { - u16 cap_nr; - bool cap_extended; - unsigned int size; - u32 data[]; -}; - -struct pci_cap_saved_state { - struct hlist_node next; - struct pci_cap_saved_data cap; -}; - void pci_reserve_saved_caps(struct pci_dev *dev); -void pci_free_cap_save_buffers(struct pci_dev *dev); -int pci_add_cap_save_buffer(struct pci_dev *dev, char cap, unsigned int size); -int pci_add_ext_cap_save_buffer(struct pci_dev *dev, - u16 cap, unsigned int size); -struct pci_cap_saved_state *pci_find_saved_cap(struct pci_dev *dev, char cap); -struct pci_cap_saved_state *pci_find_saved_ext_cap(struct pci_dev *dev, - u16 cap); /* DWORDs of the configuration space header, i.e. pci_dev.saved_config_space */ #define PCI_STD_HEADER_DWORDS (PCI_STD_HEADER_SIZEOF / sizeof(u32)) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index c04adf606ab9..0a86de920225 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -2475,7 +2475,6 @@ static void pci_release_capabilities(struct pci_dev *dev) pci_aer_exit(dev); pci_rcec_exit(dev); pci_iov_release(dev); - pci_free_cap_save_buffers(dev); pci_saved_caps_release(dev); } diff --git a/include/linux/pci.h b/include/linux/pci.h index 2c27124c81e5..6ba724e1f04e 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -549,7 +549,6 @@ struct pci_dev { spinlock_t pcie_cap_lock; /* Protects RMW ops in capability accessors */ u32 saved_config_space[16]; /* Config space saved at suspend time */ - struct hlist_head saved_cap_space; struct pci_saved_caps saved_caps; /* Saved capability registers */ #ifdef CONFIG_HOTPLUG_PCI_PCIE -- 2.56.0.455.g6c5a503b38-goog
