From 7f3a4257159dea8e7ef66d1a539dc6df708b8ed3 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 7 Aug 2024 15:17:46 +0200 Subject: Adding upstream version 6.10.3. Signed-off-by: Daniel Baumann --- drivers/firmware/arm_scmi/driver.c | 269 ++++++++++++++++++++++++++++++++----- 1 file changed, 239 insertions(+), 30 deletions(-) (limited to 'drivers/firmware/arm_scmi/driver.c') diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c index 2709598f30..6b6957f474 100644 --- a/drivers/firmware/arm_scmi/driver.c +++ b/drivers/firmware/arm_scmi/driver.c @@ -33,6 +33,7 @@ #include #include #include +#include #include "common.h" #include "notify.h" @@ -44,8 +45,7 @@ static DEFINE_IDA(scmi_id); -static DEFINE_IDR(scmi_protocols); -static DEFINE_SPINLOCK(protocol_lock); +static DEFINE_XARRAY(scmi_protocols); /* List of all SCMI devices active in system */ static LIST_HEAD(scmi_list); @@ -194,11 +194,94 @@ struct scmi_info { #define bus_nb_to_scmi_info(nb) container_of(nb, struct scmi_info, bus_nb) #define req_nb_to_scmi_info(nb) container_of(nb, struct scmi_info, dev_req_nb) -static const struct scmi_protocol *scmi_protocol_get(int protocol_id) +static unsigned long +scmi_vendor_protocol_signature(unsigned int protocol_id, char *vendor_id, + char *sub_vendor_id, u32 impl_ver) { - const struct scmi_protocol *proto; + char *signature, *p; + unsigned long hash = 0; - proto = idr_find(&scmi_protocols, protocol_id); + /* vendor_id/sub_vendor_id guaranteed <= SCMI_SHORT_NAME_MAX_SIZE */ + signature = kasprintf(GFP_KERNEL, "%02X|%s|%s|0x%08X", protocol_id, + vendor_id ?: "", sub_vendor_id ?: "", impl_ver); + if (!signature) + return 0; + + p = signature; + while (*p) + hash = partial_name_hash(tolower(*p++), hash); + hash = end_name_hash(hash); + + kfree(signature); + + return hash; +} + +static unsigned long +scmi_protocol_key_calculate(int protocol_id, char *vendor_id, + char *sub_vendor_id, u32 impl_ver) +{ + if (protocol_id < SCMI_PROTOCOL_VENDOR_BASE) + return protocol_id; + else + return scmi_vendor_protocol_signature(protocol_id, vendor_id, + sub_vendor_id, impl_ver); +} + +static const struct scmi_protocol * +__scmi_vendor_protocol_lookup(int protocol_id, char *vendor_id, + char *sub_vendor_id, u32 impl_ver) +{ + unsigned long key; + struct scmi_protocol *proto = NULL; + + key = scmi_protocol_key_calculate(protocol_id, vendor_id, + sub_vendor_id, impl_ver); + if (key) + proto = xa_load(&scmi_protocols, key); + + return proto; +} + +static const struct scmi_protocol * +scmi_vendor_protocol_lookup(int protocol_id, char *vendor_id, + char *sub_vendor_id, u32 impl_ver) +{ + const struct scmi_protocol *proto = NULL; + + /* Searching for closest match ...*/ + proto = __scmi_vendor_protocol_lookup(protocol_id, vendor_id, + sub_vendor_id, impl_ver); + if (proto) + return proto; + + /* Any match just on vendor/sub_vendor ? */ + if (impl_ver) { + proto = __scmi_vendor_protocol_lookup(protocol_id, vendor_id, + sub_vendor_id, 0); + if (proto) + return proto; + } + + /* Any match just on the vendor ? */ + if (sub_vendor_id) + proto = __scmi_vendor_protocol_lookup(protocol_id, vendor_id, + NULL, 0); + return proto; +} + +static const struct scmi_protocol * +scmi_protocol_get(int protocol_id, struct scmi_revision_info *version) +{ + const struct scmi_protocol *proto = NULL; + + if (protocol_id < SCMI_PROTOCOL_VENDOR_BASE) + proto = xa_load(&scmi_protocols, protocol_id); + else + proto = scmi_vendor_protocol_lookup(protocol_id, + version->vendor_id, + version->sub_vendor_id, + version->impl_ver); if (!proto || !try_module_get(proto->owner)) { pr_warn("SCMI Protocol 0x%x not found!\n", protocol_id); return NULL; @@ -206,21 +289,46 @@ static const struct scmi_protocol *scmi_protocol_get(int protocol_id) pr_debug("Found SCMI Protocol 0x%x\n", protocol_id); + if (protocol_id >= SCMI_PROTOCOL_VENDOR_BASE) + pr_info("Loaded SCMI Vendor Protocol 0x%x - %s %s %X\n", + protocol_id, proto->vendor_id ?: "", + proto->sub_vendor_id ?: "", proto->impl_ver); + return proto; } -static void scmi_protocol_put(int protocol_id) +static void scmi_protocol_put(const struct scmi_protocol *proto) { - const struct scmi_protocol *proto; - - proto = idr_find(&scmi_protocols, protocol_id); if (proto) module_put(proto->owner); } +static int scmi_vendor_protocol_check(const struct scmi_protocol *proto) +{ + if (!proto->vendor_id) { + pr_err("missing vendor_id for protocol 0x%x\n", proto->id); + return -EINVAL; + } + + if (strlen(proto->vendor_id) >= SCMI_SHORT_NAME_MAX_SIZE) { + pr_err("malformed vendor_id for protocol 0x%x\n", proto->id); + return -EINVAL; + } + + if (proto->sub_vendor_id && + strlen(proto->sub_vendor_id) >= SCMI_SHORT_NAME_MAX_SIZE) { + pr_err("malformed sub_vendor_id for protocol 0x%x\n", + proto->id); + return -EINVAL; + } + + return 0; +} + int scmi_protocol_register(const struct scmi_protocol *proto) { int ret; + unsigned long key; if (!proto) { pr_err("invalid protocol\n"); @@ -232,12 +340,23 @@ int scmi_protocol_register(const struct scmi_protocol *proto) return -EINVAL; } - spin_lock(&protocol_lock); - ret = idr_alloc(&scmi_protocols, (void *)proto, - proto->id, proto->id + 1, GFP_ATOMIC); - spin_unlock(&protocol_lock); - if (ret != proto->id) { - pr_err("unable to allocate SCMI idr slot for 0x%x - err %d\n", + if (proto->id >= SCMI_PROTOCOL_VENDOR_BASE && + scmi_vendor_protocol_check(proto)) + return -EINVAL; + + /* + * Calculate a protocol key to register this protocol with the core; + * key value 0 is considered invalid. + */ + key = scmi_protocol_key_calculate(proto->id, proto->vendor_id, + proto->sub_vendor_id, + proto->impl_ver); + if (!key) + return -EINVAL; + + ret = xa_insert(&scmi_protocols, key, (void *)proto, GFP_KERNEL); + if (ret) { + pr_err("unable to allocate SCMI protocol slot for 0x%x - err %d\n", proto->id, ret); return ret; } @@ -250,9 +369,15 @@ EXPORT_SYMBOL_GPL(scmi_protocol_register); void scmi_protocol_unregister(const struct scmi_protocol *proto) { - spin_lock(&protocol_lock); - idr_remove(&scmi_protocols, proto->id); - spin_unlock(&protocol_lock); + unsigned long key; + + key = scmi_protocol_key_calculate(proto->id, proto->vendor_id, + proto->sub_vendor_id, + proto->impl_ver); + if (!key) + return; + + xa_erase(&scmi_protocols, key); pr_debug("Unregistered SCMI Protocol 0x%x\n", proto->id); } @@ -696,6 +821,45 @@ scmi_xfer_lookup_unlocked(struct scmi_xfers_info *minfo, u16 xfer_id) return xfer ?: ERR_PTR(-EINVAL); } +/** + * scmi_bad_message_trace - A helper to trace weird messages + * + * @cinfo: A reference to the channel descriptor on which the message was + * received + * @msg_hdr: Message header to track + * @err: A specific error code used as a status value in traces. + * + * This helper can be used to trace any kind of weird, incomplete, unexpected, + * timed-out message that arrives and as such, can be traced only referring to + * the header content, since the payload is missing/unreliable. + */ +void scmi_bad_message_trace(struct scmi_chan_info *cinfo, u32 msg_hdr, + enum scmi_bad_msg err) +{ + char *tag; + struct scmi_info *info = handle_to_scmi_info(cinfo->handle); + + switch (MSG_XTRACT_TYPE(msg_hdr)) { + case MSG_TYPE_COMMAND: + tag = "!RESP"; + break; + case MSG_TYPE_DELAYED_RESP: + tag = "!DLYD"; + break; + case MSG_TYPE_NOTIFICATION: + tag = "!NOTI"; + break; + default: + tag = "!UNKN"; + break; + } + + trace_scmi_msg_dump(info->id, cinfo->id, + MSG_XTRACT_PROT_ID(msg_hdr), + MSG_XTRACT_ID(msg_hdr), tag, + MSG_XTRACT_TOKEN(msg_hdr), err, NULL, 0); +} + /** * scmi_msg_response_validate - Validate message type against state of related * xfer @@ -822,6 +986,9 @@ scmi_xfer_command_acquire(struct scmi_chan_info *cinfo, u32 msg_hdr) "Message for %d type %d is not expected!\n", xfer_id, msg_type); spin_unlock_irqrestore(&minfo->xfer_lock, flags); + + scmi_bad_message_trace(cinfo, msg_hdr, MSG_UNEXPECTED); + return xfer; } refcount_inc(&xfer->users); @@ -846,6 +1013,9 @@ scmi_xfer_command_acquire(struct scmi_chan_info *cinfo, u32 msg_hdr) dev_err(cinfo->dev, "Invalid message type:%d for %d - HDR:0x%X state:%d\n", msg_type, xfer_id, msg_hdr, xfer->state); + + scmi_bad_message_trace(cinfo, msg_hdr, MSG_INVALID); + /* On error the refcount incremented above has to be dropped */ __scmi_xfer_put(minfo, xfer); xfer = ERR_PTR(-EINVAL); @@ -882,6 +1052,9 @@ static void scmi_handle_notification(struct scmi_chan_info *cinfo, if (IS_ERR(xfer)) { dev_err(dev, "failed to get free message slot (%ld)\n", PTR_ERR(xfer)); + + scmi_bad_message_trace(cinfo, msg_hdr, MSG_NOMEM); + scmi_clear_channel(info, cinfo); return; } @@ -1001,6 +1174,7 @@ void scmi_rx_callback(struct scmi_chan_info *cinfo, u32 msg_hdr, void *priv) break; default: WARN_ONCE(1, "received unknown msg_type:%d\n", msg_type); + scmi_bad_message_trace(cinfo, msg_hdr, MSG_UNKNOWN); break; } } @@ -1488,6 +1662,20 @@ out: return ret; } +/** + * scmi_common_get_max_msg_size - Get maximum message size + * @ph: A protocol handle reference. + * + * Return: Maximum message size for the current protocol. + */ +static int scmi_common_get_max_msg_size(const struct scmi_protocol_handle *ph) +{ + const struct scmi_protocol_instance *pi = ph_to_pi(ph); + struct scmi_info *info = handle_to_scmi_info(pi->handle); + + return info->desc->max_msg_size; +} + /** * struct scmi_iterator - Iterator descriptor * @msg: A reference to the message TX buffer; filled by @prepare_message with @@ -1799,6 +1987,7 @@ static int scmi_protocol_msg_check(const struct scmi_protocol_handle *ph, static const struct scmi_proto_helpers_ops helpers_ops = { .extended_name_get = scmi_common_extended_name_get, + .get_max_msg_size = scmi_common_get_max_msg_size, .iter_response_init = scmi_iterator_init, .iter_response_run = scmi_iterator_run, .protocol_msg_check = scmi_protocol_msg_check, @@ -1891,7 +2080,7 @@ scmi_alloc_init_protocol_instance(struct scmi_info *info, /* Protocol specific devres group */ gid = devres_open_group(handle->dev, NULL, GFP_KERNEL); if (!gid) { - scmi_protocol_put(proto->id); + scmi_protocol_put(proto); goto out; } @@ -1955,7 +2144,7 @@ scmi_alloc_init_protocol_instance(struct scmi_info *info, clean: /* Take care to put the protocol module's owner before releasing all */ - scmi_protocol_put(proto->id); + scmi_protocol_put(proto); devres_release_group(handle->dev, gid); out: return ERR_PTR(ret); @@ -1989,7 +2178,7 @@ scmi_get_protocol_instance(const struct scmi_handle *handle, u8 protocol_id) const struct scmi_protocol *proto; /* Fails if protocol not registered on bus */ - proto = scmi_protocol_get(protocol_id); + proto = scmi_protocol_get(protocol_id, &info->version); if (proto) pi = scmi_alloc_init_protocol_instance(info, proto); else @@ -2044,7 +2233,7 @@ void scmi_protocol_release(const struct scmi_handle *handle, u8 protocol_id) idr_remove(&info->protocols, protocol_id); - scmi_protocol_put(protocol_id); + scmi_protocol_put(pi->proto); devres_release_group(handle->dev, gid); dev_dbg(handle->dev, "De-Initialized protocol: 0x%X\n", @@ -2491,6 +2680,10 @@ scmi_txrx_setup(struct scmi_info *info, struct device_node *of_node, ret = 0; } + if (ret) + dev_err(info->dev, + "failed to setup channel for protocol:0x%X\n", prot_id); + return ret; } @@ -2760,6 +2953,7 @@ static int scmi_debugfs_raw_mode_setup(struct scmi_info *info) static int scmi_probe(struct platform_device *pdev) { int ret; + char *err_str = "probe failure\n"; struct scmi_handle *handle; const struct scmi_desc *desc; struct scmi_info *info; @@ -2810,27 +3004,37 @@ static int scmi_probe(struct platform_device *pdev) if (desc->ops->link_supplier) { ret = desc->ops->link_supplier(dev); - if (ret) + if (ret) { + err_str = "transport not ready\n"; goto clear_ida; + } } /* Setup all channels described in the DT at first */ ret = scmi_channels_setup(info); - if (ret) + if (ret) { + err_str = "failed to setup channels\n"; goto clear_ida; + } ret = bus_register_notifier(&scmi_bus_type, &info->bus_nb); - if (ret) + if (ret) { + err_str = "failed to register bus notifier\n"; goto clear_txrx_setup; + } ret = blocking_notifier_chain_register(&scmi_requested_devices_nh, &info->dev_req_nb); - if (ret) + if (ret) { + err_str = "failed to register device notifier\n"; goto clear_bus_notifier; + } ret = scmi_xfer_info_init(info); - if (ret) + if (ret) { + err_str = "failed to init xfers pool\n"; goto clear_dev_req_notifier; + } if (scmi_top_dentry) { info->dbg = scmi_debugfs_common_setup(info); @@ -2867,9 +3071,11 @@ static int scmi_probe(struct platform_device *pdev) */ ret = scmi_protocol_acquire(handle, SCMI_PROTOCOL_BASE); if (ret) { - dev_err(dev, "unable to communicate with SCMI\n"); - if (coex) + err_str = "unable to communicate with SCMI\n"; + if (coex) { + dev_err(dev, "%s", err_str); return 0; + } goto notification_exit; } @@ -2923,7 +3129,8 @@ clear_txrx_setup: scmi_cleanup_txrx_channels(info); clear_ida: ida_free(&scmi_id, info->id); - return ret; + + return dev_err_probe(dev, ret, "%s", err_str); } static void scmi_remove(struct platform_device *pdev) @@ -3127,6 +3334,7 @@ static int __init scmi_driver_init(void) scmi_voltage_register(); scmi_system_register(); scmi_powercap_register(); + scmi_pinctrl_register(); return platform_driver_register(&scmi_driver); } @@ -3144,6 +3352,7 @@ static void __exit scmi_driver_exit(void) scmi_voltage_unregister(); scmi_system_unregister(); scmi_powercap_unregister(); + scmi_pinctrl_unregister(); scmi_transports_exit(); -- cgit v1.2.3