Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Michal Schmidt | 412 | 98.80% | 2 | 50.00% |
Anirudh Venkataramanan | 5 | 1.20% | 2 | 50.00% |
Total | 417 | 4 |
// SPDX-License-Identifier: GPL-2.0-only // SPDX-FileCopyrightText: Copyright Red Hat #include <linux/bitfield.h> #include <linux/cleanup.h> #include <linux/mutex.h> #include <linux/pci.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/xarray.h> #include "ice_adapter.h" static DEFINE_XARRAY(ice_adapters); /* PCI bus number is 8 bits. Slot is 5 bits. Domain can have the rest. */ #define INDEX_FIELD_DOMAIN GENMASK(BITS_PER_LONG - 1, 13) #define INDEX_FIELD_BUS GENMASK(12, 5) #define INDEX_FIELD_SLOT GENMASK(4, 0) static unsigned long ice_adapter_index(const struct pci_dev *pdev) { unsigned int domain = pci_domain_nr(pdev->bus); WARN_ON(domain > FIELD_MAX(INDEX_FIELD_DOMAIN)); return FIELD_PREP(INDEX_FIELD_DOMAIN, domain) | FIELD_PREP(INDEX_FIELD_BUS, pdev->bus->number) | FIELD_PREP(INDEX_FIELD_SLOT, PCI_SLOT(pdev->devfn)); } static struct ice_adapter *ice_adapter_new(void) { struct ice_adapter *adapter; adapter = kzalloc(sizeof(*adapter), GFP_KERNEL); if (!adapter) return NULL; spin_lock_init(&adapter->ptp_gltsyn_time_lock); refcount_set(&adapter->refcount, 1); return adapter; } static void ice_adapter_free(struct ice_adapter *adapter) { kfree(adapter); } DEFINE_FREE(ice_adapter_free, struct ice_adapter*, if (_T) ice_adapter_free(_T)) /** * ice_adapter_get - Get a shared ice_adapter structure. * @pdev: Pointer to the pci_dev whose driver is getting the ice_adapter. * * Gets a pointer to a shared ice_adapter structure. Physical functions (PFs) * of the same multi-function PCI device share one ice_adapter structure. * The ice_adapter is reference-counted. The PF driver must use ice_adapter_put * to release its reference. * * Context: Process, may sleep. * Return: Pointer to ice_adapter on success. * ERR_PTR() on error. -ENOMEM is the only possible error. */ struct ice_adapter *ice_adapter_get(const struct pci_dev *pdev) { struct ice_adapter *ret, __free(ice_adapter_free) *adapter = NULL; unsigned long index = ice_adapter_index(pdev); adapter = ice_adapter_new(); if (!adapter) return ERR_PTR(-ENOMEM); xa_lock(&ice_adapters); ret = __xa_cmpxchg(&ice_adapters, index, NULL, adapter, GFP_KERNEL); if (xa_is_err(ret)) { ret = ERR_PTR(xa_err(ret)); goto unlock; } if (ret) { refcount_inc(&ret->refcount); goto unlock; } ret = no_free_ptr(adapter); unlock: xa_unlock(&ice_adapters); return ret; } /** * ice_adapter_put - Release a reference to the shared ice_adapter structure. * @pdev: Pointer to the pci_dev whose driver is releasing the ice_adapter. * * Releases the reference to ice_adapter previously obtained with * ice_adapter_get. * * Context: Any. */ void ice_adapter_put(const struct pci_dev *pdev) { unsigned long index = ice_adapter_index(pdev); struct ice_adapter *adapter; xa_lock(&ice_adapters); adapter = xa_load(&ice_adapters, index); if (WARN_ON(!adapter)) goto unlock; if (!refcount_dec_and_test(&adapter->refcount)) goto unlock; WARN_ON(__xa_erase(&ice_adapters, index) != adapter); ice_adapter_free(adapter); unlock: xa_unlock(&ice_adapters); }
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with Cregit http://github.com/cregit/cregit
Version 2.0-RC1