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author | 2018-08-14 18:52:30 +0100 | |
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committer | 2018-08-14 18:53:17 +0100 | |
commit | b63264c8342e6a1b6971c79550d2af2024b6a4de (patch) | |
tree | 83114aac64286fe616506c0b3dfaec2ab86ef835 /drivers/bus/vmbus/vmbus_common.c | |
parent | ca33590b6af032bff57d9cc70455660466a654b2 (diff) |
New upstream version 18.08upstream/18.08
Change-Id: I32fdf5e5016556d9c0a6d88ddaf1fc468961790a
Signed-off-by: Luca Boccassi <luca.boccassi@gmail.com>
Diffstat (limited to 'drivers/bus/vmbus/vmbus_common.c')
-rw-r--r-- | drivers/bus/vmbus/vmbus_common.c | 286 |
1 files changed, 286 insertions, 0 deletions
diff --git a/drivers/bus/vmbus/vmbus_common.c b/drivers/bus/vmbus/vmbus_common.c new file mode 100644 index 00000000..c7165ad5 --- /dev/null +++ b/drivers/bus/vmbus/vmbus_common.c @@ -0,0 +1,286 @@ +/* SPDX-License-Identifier: BSD-3-Clause + * Copyright (c) 2018, Microsoft Corporation. + * All Rights Reserved. + */ + +#include <string.h> +#include <unistd.h> +#include <dirent.h> +#include <fcntl.h> +#include <sys/queue.h> +#include <sys/mman.h> + +#include <rte_log.h> +#include <rte_bus.h> +#include <rte_eal.h> +#include <rte_tailq.h> +#include <rte_devargs.h> +#include <rte_malloc.h> +#include <rte_errno.h> +#include <rte_memory.h> +#include <rte_bus_vmbus.h> + +#include "private.h" + +int vmbus_logtype_bus; +extern struct rte_vmbus_bus rte_vmbus_bus; + +/* map a particular resource from a file */ +void * +vmbus_map_resource(void *requested_addr, int fd, off_t offset, size_t size, + int flags) +{ + void *mapaddr; + + /* Map the memory resource of device */ + mapaddr = mmap(requested_addr, size, PROT_READ | PROT_WRITE, + MAP_SHARED | flags, fd, offset); + if (mapaddr == MAP_FAILED) { + VMBUS_LOG(ERR, + "mmap(%d, %p, %zu, %ld) failed: %s", + fd, requested_addr, size, (long)offset, + strerror(errno)); + } + return mapaddr; +} + +/* unmap a particular resource */ +void +vmbus_unmap_resource(void *requested_addr, size_t size) +{ + if (requested_addr == NULL) + return; + + /* Unmap the VMBUS memory resource of device */ + if (munmap(requested_addr, size)) { + VMBUS_LOG(ERR, "munmap(%p, 0x%lx) failed: %s", + requested_addr, (unsigned long)size, + strerror(errno)); + } else + VMBUS_LOG(DEBUG, " VMBUS memory unmapped at %p", + requested_addr); +} + +/** + * Match the VMBUS driver and device using UUID table + * + * @param drv + * VMBUS driver from which ID table would be extracted + * @param pci_dev + * VMBUS device to match against the driver + * @return + * true for successful match + * false for unsuccessful match + */ +static bool +vmbus_match(const struct rte_vmbus_driver *dr, + const struct rte_vmbus_device *dev) +{ + const rte_uuid_t *id_table; + + for (id_table = dr->id_table; !rte_uuid_is_null(*id_table); ++id_table) { + if (rte_uuid_compare(*id_table, dev->class_id) == 0) + return true; + } + + return false; +} + +/* + * If device ID match, call the devinit() function of the driver. + */ +static int +vmbus_probe_one_driver(struct rte_vmbus_driver *dr, + struct rte_vmbus_device *dev) +{ + char guid[RTE_UUID_STRLEN]; + int ret; + + if (!vmbus_match(dr, dev)) + return 1; /* not supported */ + + rte_uuid_unparse(dev->device_id, guid, sizeof(guid)); + VMBUS_LOG(INFO, "VMBUS device %s on NUMA socket %i", + guid, dev->device.numa_node); + + /* TODO add blacklisted */ + + /* map resources for device */ + ret = rte_vmbus_map_device(dev); + if (ret != 0) + return ret; + + /* reference driver structure */ + dev->driver = dr; + dev->device.driver = &dr->driver; + + if (dev->device.numa_node < 0) { + VMBUS_LOG(WARNING, " Invalid NUMA socket, default to 0"); + dev->device.numa_node = 0; + } + + /* call the driver probe() function */ + VMBUS_LOG(INFO, " probe driver: %s", dr->driver.name); + ret = dr->probe(dr, dev); + if (ret) { + dev->driver = NULL; + rte_vmbus_unmap_device(dev); + } + + return ret; +} + +/* + * IF device class GUID mathces, call the probe function of + * registere drivers for the vmbus device. + * Return -1 if initialization failed, + * and 1 if no driver found for this device. + */ +static int +vmbus_probe_all_drivers(struct rte_vmbus_device *dev) +{ + struct rte_vmbus_driver *dr; + int rc; + + /* Check if a driver is already loaded */ + if (dev->driver != NULL) { + VMBUS_LOG(DEBUG, "VMBUS driver already loaded"); + return 0; + } + + FOREACH_DRIVER_ON_VMBUS(dr) { + rc = vmbus_probe_one_driver(dr, dev); + if (rc < 0) /* negative is an error */ + return -1; + + if (rc > 0) /* positive driver doesn't support it */ + continue; + + return 0; + } + return 1; +} + +/* + * Scan the vmbus, and call the devinit() function for + * all registered drivers that have a matching entry in its id_table + * for discovered devices. + */ +int +rte_vmbus_probe(void) +{ + struct rte_vmbus_device *dev; + size_t probed = 0, failed = 0; + char ubuf[RTE_UUID_STRLEN]; + + FOREACH_DEVICE_ON_VMBUS(dev) { + probed++; + + rte_uuid_unparse(dev->device_id, ubuf, sizeof(ubuf)); + + /* TODO: add whitelist/blacklist */ + + if (vmbus_probe_all_drivers(dev) < 0) { + VMBUS_LOG(NOTICE, + "Requested device %s cannot be used", ubuf); + rte_errno = errno; + failed++; + } + } + + return (probed && probed == failed) ? -1 : 0; +} + +static int +vmbus_parse(const char *name, void *addr) +{ + rte_uuid_t guid; + int ret; + + ret = rte_uuid_parse(name, guid); + if (ret == 0 && addr) + memcpy(addr, &guid, sizeof(guid)); + + return ret; +} + +/* register vmbus driver */ +void +rte_vmbus_register(struct rte_vmbus_driver *driver) +{ + VMBUS_LOG(DEBUG, + "Registered driver %s", driver->driver.name); + + TAILQ_INSERT_TAIL(&rte_vmbus_bus.driver_list, driver, next); + driver->bus = &rte_vmbus_bus; +} + +/* unregister vmbus driver */ +void +rte_vmbus_unregister(struct rte_vmbus_driver *driver) +{ + TAILQ_REMOVE(&rte_vmbus_bus.driver_list, driver, next); + driver->bus = NULL; +} + +/* Add a device to VMBUS bus */ +void +vmbus_add_device(struct rte_vmbus_device *vmbus_dev) +{ + TAILQ_INSERT_TAIL(&rte_vmbus_bus.device_list, vmbus_dev, next); +} + +/* Insert a device into a predefined position in VMBUS bus */ +void +vmbus_insert_device(struct rte_vmbus_device *exist_vmbus_dev, + struct rte_vmbus_device *new_vmbus_dev) +{ + TAILQ_INSERT_BEFORE(exist_vmbus_dev, new_vmbus_dev, next); +} + +/* Remove a device from VMBUS bus */ +void +vmbus_remove_device(struct rte_vmbus_device *vmbus_dev) +{ + TAILQ_REMOVE(&rte_vmbus_bus.device_list, vmbus_dev, next); +} + +/* VMBUS doesn't support hotplug */ +static struct rte_device * +vmbus_find_device(const struct rte_device *start, rte_dev_cmp_t cmp, + const void *data) +{ + struct rte_vmbus_device *dev; + + FOREACH_DEVICE_ON_VMBUS(dev) { + if (start && &dev->device == start) { + start = NULL; + continue; + } + if (cmp(&dev->device, data) == 0) + return &dev->device; + } + + return NULL; +} + + +struct rte_vmbus_bus rte_vmbus_bus = { + .bus = { + .scan = rte_vmbus_scan, + .probe = rte_vmbus_probe, + .find_device = vmbus_find_device, + .parse = vmbus_parse, + }, + .device_list = TAILQ_HEAD_INITIALIZER(rte_vmbus_bus.device_list), + .driver_list = TAILQ_HEAD_INITIALIZER(rte_vmbus_bus.driver_list), +}; + +RTE_REGISTER_BUS(vmbus, rte_vmbus_bus.bus); + +RTE_INIT(vmbus_init_log) +{ + vmbus_logtype_bus = rte_log_register("bus.vmbus"); + if (vmbus_logtype_bus >= 0) + rte_log_set_level(vmbus_logtype_bus, RTE_LOG_NOTICE); +} |