2014-10-02 02:54:15 +00:00
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/*
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* Greybus operations
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*
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* Copyright 2014 Google Inc.
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*
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* Released under the GPLv2 only.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/workqueue.h>
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#include "greybus.h"
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2014-10-16 11:35:31 +00:00
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/*
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* The top bit of the type in an operation message header indicates
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* whether the message is a request (bit clear) or response (bit set)
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*/
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#define GB_OPERATION_TYPE_RESPONSE 0x80
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2014-10-16 11:35:33 +00:00
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/*
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* XXX This needs to be coordinated with host driver parameters
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*/
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#define GB_OPERATION_MESSAGE_SIZE_MAX 4096
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2014-10-16 11:35:34 +00:00
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/* Workqueue to handle Greybus operation completions. */
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static struct workqueue_struct *gb_operation_recv_workqueue;
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2014-10-02 02:54:15 +00:00
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/*
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* All operation messages (both requests and responses) begin with
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* a common header that encodes the size of the data (header
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* included). This header also contains a unique identifier, which
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* is used to keep track of in-flight operations. Finally, the
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* header contains a operation type field, whose interpretation is
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* dependent on what type of device lies on the other end of the
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* connection. Response messages are distinguished from request
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* messages by setting the high bit (0x80) in the operation type
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* value.
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*
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* The wire format for all numeric fields in the header is little
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* endian. Any operation-specific data begins immediately after the
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* header, and is 64-bit aligned.
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*/
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struct gb_operation_msg_hdr {
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__le16 size; /* Size in bytes of header + payload */
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__le16 id; /* Operation unique id */
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__u8 type; /* E.g GB_I2C_TYPE_* or GB_GPIO_TYPE_* */
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/* 3 bytes pad, must be zero (ignore when read) */
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} __aligned(sizeof(u64));
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/* XXX Could be per-host device, per-module, or even per-connection */
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static DEFINE_SPINLOCK(gb_operations_lock);
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2014-10-16 11:35:32 +00:00
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static void gb_operation_insert(struct gb_operation *operation)
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{
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struct gb_connection *connection = operation->connection;
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struct rb_root *root = &connection->pending;
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struct rb_node *node = &operation->node;
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struct rb_node **link = &root->rb_node;
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struct rb_node *above = NULL;
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struct gb_operation_msg_hdr *header;
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__le16 wire_id;
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/*
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* Assign the operation's id, and store it in the header of
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* both request and response message headers.
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*/
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operation->id = gb_connection_operation_id(connection);
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wire_id = cpu_to_le16(operation->id);
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header = operation->request->transfer_buffer;
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header->id = wire_id;
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/* OK, insert the operation into its connection's tree */
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spin_lock_irq(&gb_operations_lock);
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while (*link) {
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struct gb_operation *other;
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above = *link;
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other = rb_entry(above, struct gb_operation, node);
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header = other->request->transfer_buffer;
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if (other->id > operation->id)
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link = &above->rb_left;
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else if (other->id < operation->id)
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link = &above->rb_right;
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}
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rb_link_node(node, above, link);
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rb_insert_color(node, root);
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spin_unlock_irq(&gb_operations_lock);
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}
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static void gb_operation_remove(struct gb_operation *operation)
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{
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spin_lock_irq(&gb_operations_lock);
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rb_erase(&operation->node, &operation->connection->pending);
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spin_unlock_irq(&gb_operations_lock);
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}
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static struct gb_operation *
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gb_operation_find(struct gb_connection *connection, u16 id)
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{
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2014-10-16 11:35:33 +00:00
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struct gb_operation *operation = NULL;
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2014-10-16 11:35:32 +00:00
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struct rb_node *node;
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bool found = false;
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spin_lock_irq(&gb_operations_lock);
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node = connection->pending.rb_node;
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while (node && !found) {
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operation = rb_entry(node, struct gb_operation, node);
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if (operation->id > id)
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node = node->rb_left;
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else if (operation->id < id)
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node = node->rb_right;
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else
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found = true;
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}
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spin_unlock_irq(&gb_operations_lock);
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return found ? operation : NULL;
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}
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2014-10-02 02:54:15 +00:00
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/*
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* An operations's response message has arrived. If no callback was
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* supplied it was submitted for asynchronous completion, so we notify
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* any waiters. Otherwise we assume calling the completion is enough
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* and nobody else will be waiting.
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*/
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void gb_operation_complete(struct gb_operation *operation)
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{
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if (operation->callback)
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operation->callback(operation);
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else
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complete_all(&operation->completion);
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}
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2014-10-16 11:35:34 +00:00
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/* Wait for a submitted operation to complete */
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2014-10-02 02:54:15 +00:00
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int gb_operation_wait(struct gb_operation *operation)
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{
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int ret;
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ret = wait_for_completion_interruptible(&operation->completion);
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/* If interrupted, cancel the in-flight buffer */
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if (ret < 0)
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2014-10-16 11:35:31 +00:00
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ret = greybus_kill_gbuf(operation->request);
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2014-10-02 02:54:15 +00:00
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return ret;
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}
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2014-10-16 11:35:38 +00:00
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/*
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* This handler is used if no operation response messages are ever
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* expected for a given protocol.
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*/
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static void gb_operation_recv_none(struct gb_operation *operation)
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{
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/* Nothing to do! */
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}
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2014-10-16 11:35:34 +00:00
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typedef void (*gb_operation_recv_handler)(struct gb_operation *operation);
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static gb_operation_recv_handler gb_operation_recv_handlers[] = {
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[GREYBUS_PROTOCOL_CONTROL] = NULL,
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[GREYBUS_PROTOCOL_AP] = NULL,
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[GREYBUS_PROTOCOL_GPIO] = NULL,
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2014-10-16 11:35:38 +00:00
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[GREYBUS_PROTOCOL_I2C] = gb_operation_recv_none,
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2014-10-16 11:35:34 +00:00
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[GREYBUS_PROTOCOL_UART] = NULL,
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[GREYBUS_PROTOCOL_HID] = NULL,
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2014-10-20 07:24:57 +00:00
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[GREYBUS_PROTOCOL_BATTERY] = gb_operation_recv_none,
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2014-10-20 08:02:56 +00:00
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[GREYBUS_PROTOCOL_LED] = NULL,
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2014-10-16 11:35:34 +00:00
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[GREYBUS_PROTOCOL_VENDOR] = NULL,
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};
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static void gb_operation_request_handle(struct gb_operation *operation)
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{
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u8 protocol = operation->connection->protocol;
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/* Subtract one from array size to stay within u8 range */
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if (protocol <= (u8)(ARRAY_SIZE(gb_operation_recv_handlers) - 1)) {
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gb_operation_recv_handler handler;
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handler = gb_operation_recv_handlers[protocol];
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if (handler) {
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handler(operation); /* Handle the request */
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return;
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}
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}
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gb_connection_err(operation->connection, "unrecognized protocol %u\n",
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(unsigned int)protocol);
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operation->result = GB_OP_PROTOCOL_BAD;
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gb_operation_complete(operation);
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}
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2014-10-02 02:54:15 +00:00
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/*
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2014-10-16 11:35:34 +00:00
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* Either this operation contains an incoming request, or its
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* response has arrived. An incoming request will have a null
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* response buffer pointer (it is the responsibility of the request
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* handler to allocate and fill in the response buffer).
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2014-10-02 02:54:15 +00:00
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*/
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2014-10-16 11:35:34 +00:00
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static void gb_operation_recv_work(struct work_struct *recv_work)
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2014-10-02 02:54:15 +00:00
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{
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2014-10-16 11:35:32 +00:00
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struct gb_operation *operation;
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2014-10-16 11:35:34 +00:00
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bool incoming_request;
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2014-10-16 11:35:32 +00:00
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2014-10-16 11:35:34 +00:00
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operation = container_of(recv_work, struct gb_operation, recv_work);
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incoming_request = operation->response == NULL;
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if (incoming_request)
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gb_operation_request_handle(operation);
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gb_operation_complete(operation);
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/* We're finished with the buffer we read into */
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if (incoming_request)
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greybus_gbuf_finished(operation->request);
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2014-10-16 11:35:32 +00:00
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else
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2014-10-16 11:35:34 +00:00
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greybus_gbuf_finished(operation->response);
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}
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/*
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* Buffer completion function. We get notified whenever any buffer
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* completes. For outbound messages, this tells us that the message
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* has been sent. For inbound messages, it means the data has
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* landed in the buffer and is ready to be processed.
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*
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* Either way, we don't do anything. We don't really care when an
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* outbound message has been sent, and for incoming messages we
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* we'll be done with everything we need to do before we mark it
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* finished.
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*
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2014-10-18 02:03:49 +00:00
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* XXX We may want to record that a request is (or is no longer) in flight.
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2014-10-16 11:35:34 +00:00
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*/
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static void gb_operation_gbuf_complete(struct gbuf *gbuf)
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{
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2014-10-18 02:03:49 +00:00
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if (gbuf->status) {
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struct gb_operation *operation = gbuf->context;
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struct gb_operation_msg_hdr *header;
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int id;
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int type;
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if (gbuf == operation->request)
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header = operation->request_payload;
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else if (gbuf == operation->response)
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header = operation->response_payload;
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else
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header = NULL;
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id = header ? (int)header->id : -1;
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type = header ? (int)header->type : -1;
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gb_connection_err(operation->connection,
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"operation %d type %d gbuf error %d",
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id, type, gbuf->status);
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}
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2014-10-16 11:35:34 +00:00
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return;
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2014-10-02 02:54:15 +00:00
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}
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/*
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2014-10-16 11:35:31 +00:00
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* Allocate a buffer to be used for an operation request or response
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2014-10-16 11:35:34 +00:00
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* message. For outgoing messages, both types of message contain a
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* common header, which is filled in here. Incoming requests or
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* responses also contain the same header, but there's no need to
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* initialize it here (it'll be overwritten by the incoming
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* message).
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2014-10-16 11:35:31 +00:00
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*/
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struct gbuf *gb_operation_gbuf_create(struct gb_operation *operation,
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2014-10-16 11:35:34 +00:00
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u8 type, size_t size, bool data_out)
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2014-10-16 11:35:31 +00:00
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{
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struct gb_connection *connection = operation->connection;
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struct gb_operation_msg_hdr *header;
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struct gbuf *gbuf;
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2014-10-16 11:35:34 +00:00
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gfp_t gfp_flags = data_out ? GFP_KERNEL : GFP_ATOMIC;
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2014-10-16 11:35:31 +00:00
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size += sizeof(*header);
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gbuf = greybus_alloc_gbuf(connection, gb_operation_gbuf_complete,
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2014-10-16 11:35:34 +00:00
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size, data_out, gfp_flags, operation);
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2014-10-16 11:35:31 +00:00
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if (!gbuf)
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return NULL;
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/* Fill in the header structure */
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header = (struct gb_operation_msg_hdr *)gbuf->transfer_buffer;
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header->size = cpu_to_le16(size);
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header->id = 0; /* Filled in when submitted */
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header->type = type;
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return gbuf;
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}
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/*
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* Create a Greybus operation to be sent over the given connection.
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* The request buffer will big enough for a payload of the given
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* size. Outgoing requests must specify the size of the response
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* buffer size, which must be sufficient to hold all expected
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* response data.
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*
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* Incoming requests will supply a response size of 0, and in that
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* case no response buffer is allocated. (A response always
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* includes a status byte, so 0 is not a valid size.) Whatever
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* handles the operation request is responsible for allocating the
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* response buffer.
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2014-10-02 02:54:15 +00:00
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*
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2014-10-16 11:35:31 +00:00
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* Returns a pointer to the new operation or a null pointer if an
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* error occurs.
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2014-10-02 02:54:15 +00:00
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*/
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struct gb_operation *gb_operation_create(struct gb_connection *connection,
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2014-10-16 11:35:31 +00:00
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u8 type, size_t request_size,
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size_t response_size)
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2014-10-02 02:54:15 +00:00
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{
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struct gb_operation *operation;
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2014-10-16 11:35:31 +00:00
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gfp_t gfp_flags = response_size ? GFP_KERNEL : GFP_ATOMIC;
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2014-10-16 11:35:34 +00:00
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bool outgoing = response_size != 0;
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2014-10-02 02:54:15 +00:00
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/* XXX Use a slab cache */
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2014-10-16 11:35:31 +00:00
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operation = kzalloc(sizeof(*operation), gfp_flags);
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2014-10-02 02:54:15 +00:00
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if (!operation)
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return NULL;
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2014-10-16 11:35:31 +00:00
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operation->connection = connection; /* XXX refcount? */
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2014-10-02 02:54:15 +00:00
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2014-10-16 11:35:31 +00:00
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operation->request = gb_operation_gbuf_create(operation, type,
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2014-10-16 11:35:34 +00:00
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request_size,
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outgoing);
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2014-10-16 11:35:31 +00:00
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if (!operation->request) {
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2014-10-02 02:54:15 +00:00
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kfree(operation);
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return NULL;
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}
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2014-10-16 11:35:31 +00:00
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operation->request_payload = operation->request->transfer_buffer +
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sizeof(struct gb_operation_msg_hdr);
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/* We always use the full request buffer */
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operation->request->actual_length = request_size;
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2014-10-16 11:35:34 +00:00
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if (outgoing) {
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2014-10-16 11:35:31 +00:00
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type |= GB_OPERATION_TYPE_RESPONSE;
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|
|
operation->response = gb_operation_gbuf_create(operation,
|
2014-10-16 11:35:34 +00:00
|
|
|
type, response_size,
|
|
|
|
false);
|
2014-10-16 11:35:31 +00:00
|
|
|
if (!operation->response) {
|
|
|
|
greybus_free_gbuf(operation->request);
|
|
|
|
kfree(operation);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
operation->response_payload =
|
|
|
|
operation->response->transfer_buffer +
|
|
|
|
sizeof(struct gb_operation_msg_hdr);
|
|
|
|
}
|
2014-10-02 02:54:15 +00:00
|
|
|
|
2014-10-16 11:35:34 +00:00
|
|
|
INIT_WORK(&operation->recv_work, gb_operation_recv_work);
|
2014-10-02 02:54:15 +00:00
|
|
|
operation->callback = NULL; /* set at submit time */
|
|
|
|
init_completion(&operation->completion);
|
|
|
|
|
|
|
|
spin_lock_irq(&gb_operations_lock);
|
|
|
|
list_add_tail(&operation->links, &connection->operations);
|
|
|
|
spin_unlock_irq(&gb_operations_lock);
|
|
|
|
|
|
|
|
return operation;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Destroy a previously created operation.
|
|
|
|
*/
|
|
|
|
void gb_operation_destroy(struct gb_operation *operation)
|
|
|
|
{
|
|
|
|
if (WARN_ON(!operation))
|
|
|
|
return;
|
|
|
|
|
|
|
|
/* XXX Make sure it's not in flight */
|
|
|
|
spin_lock_irq(&gb_operations_lock);
|
|
|
|
list_del(&operation->links);
|
|
|
|
spin_unlock_irq(&gb_operations_lock);
|
|
|
|
|
2014-10-16 11:35:31 +00:00
|
|
|
greybus_free_gbuf(operation->response);
|
|
|
|
greybus_free_gbuf(operation->request);
|
2014-10-02 02:54:15 +00:00
|
|
|
|
|
|
|
kfree(operation);
|
|
|
|
}
|
2014-10-16 11:35:33 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Send an operation request message. The caller has filled in
|
|
|
|
* any payload so the request message is ready to go. If non-null,
|
|
|
|
* the callback function supplied will be called when the response
|
|
|
|
* message has arrived indicating the operation is complete. A null
|
|
|
|
* callback function is used for a synchronous request; return from
|
|
|
|
* this function won't occur until the operation is complete (or an
|
|
|
|
* interrupt occurs).
|
|
|
|
*/
|
|
|
|
int gb_operation_request_send(struct gb_operation *operation,
|
|
|
|
gb_operation_callback callback)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* XXX
|
|
|
|
* I think the order of operations is going to be
|
|
|
|
* significant, and if so, we may need a mutex to surround
|
|
|
|
* setting the operation id and submitting the gbuf.
|
|
|
|
*/
|
|
|
|
operation->callback = callback;
|
|
|
|
gb_operation_insert(operation);
|
|
|
|
ret = greybus_submit_gbuf(operation->request, GFP_KERNEL);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
if (!callback)
|
|
|
|
ret = gb_operation_wait(operation);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Send a response for an incoming operation request.
|
|
|
|
*/
|
|
|
|
int gb_operation_response_send(struct gb_operation *operation)
|
|
|
|
{
|
|
|
|
/* XXX
|
|
|
|
* Caller needs to have set operation->response->actual_length
|
|
|
|
*/
|
|
|
|
gb_operation_remove(operation);
|
|
|
|
gb_operation_destroy(operation);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2014-10-16 11:35:34 +00:00
|
|
|
/*
|
|
|
|
* Handle data arriving on a connection. This is called in
|
|
|
|
* interrupt context, so just copy the incoming data into a buffer
|
|
|
|
* and do remaining handling via a work queue.
|
|
|
|
*/
|
2014-10-16 11:35:33 +00:00
|
|
|
void gb_connection_operation_recv(struct gb_connection *connection,
|
|
|
|
void *data, size_t size)
|
|
|
|
{
|
|
|
|
struct gb_operation_msg_hdr *header;
|
|
|
|
struct gb_operation *operation;
|
|
|
|
struct gbuf *gbuf;
|
|
|
|
u16 msg_size;
|
|
|
|
|
|
|
|
if (size > GB_OPERATION_MESSAGE_SIZE_MAX) {
|
|
|
|
gb_connection_err(connection, "message too big");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
header = data;
|
|
|
|
msg_size = le16_to_cpu(header->size);
|
|
|
|
if (header->type & GB_OPERATION_TYPE_RESPONSE) {
|
|
|
|
u16 id = le16_to_cpu(header->id);
|
|
|
|
|
|
|
|
operation = gb_operation_find(connection, id);
|
|
|
|
if (!operation) {
|
|
|
|
gb_connection_err(connection, "operation not found");
|
2014-10-16 11:35:34 +00:00
|
|
|
return;
|
2014-10-16 11:35:33 +00:00
|
|
|
}
|
|
|
|
gb_operation_remove(operation);
|
|
|
|
gbuf = operation->response;
|
2014-10-17 10:18:22 +00:00
|
|
|
gbuf->status = GB_OP_SUCCESS; /* If we got here we're good */
|
2014-10-16 11:35:33 +00:00
|
|
|
if (size > gbuf->transfer_buffer_length) {
|
|
|
|
gb_connection_err(connection, "recv buffer too small");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
WARN_ON(msg_size != size);
|
|
|
|
operation = gb_operation_create(connection, header->type,
|
|
|
|
msg_size, 0);
|
|
|
|
if (!operation) {
|
|
|
|
gb_connection_err(connection, "can't create operation");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
gbuf = operation->request;
|
|
|
|
}
|
|
|
|
|
|
|
|
memcpy(gbuf->transfer_buffer, data, msg_size);
|
|
|
|
gbuf->actual_length = msg_size;
|
|
|
|
|
2014-10-16 11:35:34 +00:00
|
|
|
/* The rest will be handled in work queue context */
|
|
|
|
queue_work(gb_operation_recv_workqueue, &operation->recv_work);
|
|
|
|
}
|
|
|
|
|
|
|
|
int gb_operation_init(void)
|
|
|
|
{
|
|
|
|
gb_operation_recv_workqueue = alloc_workqueue("greybus_recv", 0, 1);
|
|
|
|
if (!gb_operation_recv_workqueue)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
void gb_operation_exit(void)
|
|
|
|
{
|
|
|
|
destroy_workqueue(gb_operation_recv_workqueue);
|
2014-10-16 11:35:33 +00:00
|
|
|
}
|