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68b91293c8
This helps to point out which switch config read/write triggered the timeout. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
1023 lines
25 KiB
C
1023 lines
25 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Thunderbolt driver - control channel and configuration commands
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*
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* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
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* Copyright (C) 2018, Intel Corporation
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*/
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#include <linux/crc32.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/pci.h>
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#include <linux/dmapool.h>
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#include <linux/workqueue.h>
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#include "ctl.h"
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#define TB_CTL_RX_PKG_COUNT 10
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#define TB_CTL_RETRIES 4
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/**
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* struct tb_cfg - thunderbolt control channel
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*/
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struct tb_ctl {
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struct tb_nhi *nhi;
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struct tb_ring *tx;
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struct tb_ring *rx;
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struct dma_pool *frame_pool;
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struct ctl_pkg *rx_packets[TB_CTL_RX_PKG_COUNT];
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struct mutex request_queue_lock;
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struct list_head request_queue;
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bool running;
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event_cb callback;
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void *callback_data;
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};
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#define tb_ctl_WARN(ctl, format, arg...) \
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dev_WARN(&(ctl)->nhi->pdev->dev, format, ## arg)
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#define tb_ctl_err(ctl, format, arg...) \
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dev_err(&(ctl)->nhi->pdev->dev, format, ## arg)
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#define tb_ctl_warn(ctl, format, arg...) \
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dev_warn(&(ctl)->nhi->pdev->dev, format, ## arg)
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#define tb_ctl_info(ctl, format, arg...) \
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dev_info(&(ctl)->nhi->pdev->dev, format, ## arg)
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#define tb_ctl_dbg(ctl, format, arg...) \
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dev_dbg(&(ctl)->nhi->pdev->dev, format, ## arg)
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static DECLARE_WAIT_QUEUE_HEAD(tb_cfg_request_cancel_queue);
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/* Serializes access to request kref_get/put */
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static DEFINE_MUTEX(tb_cfg_request_lock);
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/**
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* tb_cfg_request_alloc() - Allocates a new config request
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*
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* This is refcounted object so when you are done with this, call
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* tb_cfg_request_put() to it.
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*/
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struct tb_cfg_request *tb_cfg_request_alloc(void)
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{
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struct tb_cfg_request *req;
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req = kzalloc(sizeof(*req), GFP_KERNEL);
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if (!req)
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return NULL;
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kref_init(&req->kref);
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return req;
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}
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/**
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* tb_cfg_request_get() - Increase refcount of a request
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* @req: Request whose refcount is increased
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*/
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void tb_cfg_request_get(struct tb_cfg_request *req)
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{
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mutex_lock(&tb_cfg_request_lock);
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kref_get(&req->kref);
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mutex_unlock(&tb_cfg_request_lock);
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}
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static void tb_cfg_request_destroy(struct kref *kref)
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{
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struct tb_cfg_request *req = container_of(kref, typeof(*req), kref);
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kfree(req);
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}
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/**
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* tb_cfg_request_put() - Decrease refcount and possibly release the request
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* @req: Request whose refcount is decreased
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*
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* Call this function when you are done with the request. When refcount
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* goes to %0 the object is released.
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*/
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void tb_cfg_request_put(struct tb_cfg_request *req)
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{
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mutex_lock(&tb_cfg_request_lock);
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kref_put(&req->kref, tb_cfg_request_destroy);
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mutex_unlock(&tb_cfg_request_lock);
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}
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static int tb_cfg_request_enqueue(struct tb_ctl *ctl,
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struct tb_cfg_request *req)
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{
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WARN_ON(test_bit(TB_CFG_REQUEST_ACTIVE, &req->flags));
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WARN_ON(req->ctl);
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mutex_lock(&ctl->request_queue_lock);
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if (!ctl->running) {
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mutex_unlock(&ctl->request_queue_lock);
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return -ENOTCONN;
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}
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req->ctl = ctl;
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list_add_tail(&req->list, &ctl->request_queue);
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set_bit(TB_CFG_REQUEST_ACTIVE, &req->flags);
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mutex_unlock(&ctl->request_queue_lock);
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return 0;
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}
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static void tb_cfg_request_dequeue(struct tb_cfg_request *req)
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{
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struct tb_ctl *ctl = req->ctl;
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mutex_lock(&ctl->request_queue_lock);
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list_del(&req->list);
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clear_bit(TB_CFG_REQUEST_ACTIVE, &req->flags);
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if (test_bit(TB_CFG_REQUEST_CANCELED, &req->flags))
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wake_up(&tb_cfg_request_cancel_queue);
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mutex_unlock(&ctl->request_queue_lock);
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}
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static bool tb_cfg_request_is_active(struct tb_cfg_request *req)
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{
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return test_bit(TB_CFG_REQUEST_ACTIVE, &req->flags);
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}
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static struct tb_cfg_request *
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tb_cfg_request_find(struct tb_ctl *ctl, struct ctl_pkg *pkg)
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{
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struct tb_cfg_request *req;
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bool found = false;
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mutex_lock(&pkg->ctl->request_queue_lock);
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list_for_each_entry(req, &pkg->ctl->request_queue, list) {
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tb_cfg_request_get(req);
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if (req->match(req, pkg)) {
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found = true;
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break;
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}
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tb_cfg_request_put(req);
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}
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mutex_unlock(&pkg->ctl->request_queue_lock);
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return found ? req : NULL;
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}
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/* utility functions */
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static int check_header(const struct ctl_pkg *pkg, u32 len,
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enum tb_cfg_pkg_type type, u64 route)
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{
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struct tb_cfg_header *header = pkg->buffer;
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/* check frame, TODO: frame flags */
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if (WARN(len != pkg->frame.size,
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"wrong framesize (expected %#x, got %#x)\n",
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len, pkg->frame.size))
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return -EIO;
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if (WARN(type != pkg->frame.eof, "wrong eof (expected %#x, got %#x)\n",
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type, pkg->frame.eof))
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return -EIO;
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if (WARN(pkg->frame.sof, "wrong sof (expected 0x0, got %#x)\n",
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pkg->frame.sof))
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return -EIO;
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/* check header */
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if (WARN(header->unknown != 1 << 9,
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"header->unknown is %#x\n", header->unknown))
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return -EIO;
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if (WARN(route != tb_cfg_get_route(header),
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"wrong route (expected %llx, got %llx)",
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route, tb_cfg_get_route(header)))
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return -EIO;
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return 0;
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}
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static int check_config_address(struct tb_cfg_address addr,
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enum tb_cfg_space space, u32 offset,
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u32 length)
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{
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if (WARN(addr.zero, "addr.zero is %#x\n", addr.zero))
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return -EIO;
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if (WARN(space != addr.space, "wrong space (expected %x, got %x\n)",
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space, addr.space))
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return -EIO;
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if (WARN(offset != addr.offset, "wrong offset (expected %x, got %x\n)",
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offset, addr.offset))
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return -EIO;
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if (WARN(length != addr.length, "wrong space (expected %x, got %x\n)",
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length, addr.length))
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return -EIO;
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/*
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* We cannot check addr->port as it is set to the upstream port of the
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* sender.
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*/
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return 0;
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}
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static struct tb_cfg_result decode_error(const struct ctl_pkg *response)
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{
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struct cfg_error_pkg *pkg = response->buffer;
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struct tb_cfg_result res = { 0 };
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res.response_route = tb_cfg_get_route(&pkg->header);
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res.response_port = 0;
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res.err = check_header(response, sizeof(*pkg), TB_CFG_PKG_ERROR,
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tb_cfg_get_route(&pkg->header));
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if (res.err)
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return res;
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WARN(pkg->zero1, "pkg->zero1 is %#x\n", pkg->zero1);
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WARN(pkg->zero2, "pkg->zero1 is %#x\n", pkg->zero1);
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WARN(pkg->zero3, "pkg->zero1 is %#x\n", pkg->zero1);
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res.err = 1;
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res.tb_error = pkg->error;
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res.response_port = pkg->port;
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return res;
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}
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static struct tb_cfg_result parse_header(const struct ctl_pkg *pkg, u32 len,
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enum tb_cfg_pkg_type type, u64 route)
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{
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struct tb_cfg_header *header = pkg->buffer;
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struct tb_cfg_result res = { 0 };
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if (pkg->frame.eof == TB_CFG_PKG_ERROR)
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return decode_error(pkg);
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res.response_port = 0; /* will be updated later for cfg_read/write */
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res.response_route = tb_cfg_get_route(header);
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res.err = check_header(pkg, len, type, route);
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return res;
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}
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static void tb_cfg_print_error(struct tb_ctl *ctl,
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const struct tb_cfg_result *res)
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{
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WARN_ON(res->err != 1);
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switch (res->tb_error) {
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case TB_CFG_ERROR_PORT_NOT_CONNECTED:
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/* Port is not connected. This can happen during surprise
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* removal. Do not warn. */
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return;
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case TB_CFG_ERROR_INVALID_CONFIG_SPACE:
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/*
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* Invalid cfg_space/offset/length combination in
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* cfg_read/cfg_write.
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*/
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tb_ctl_WARN(ctl,
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"CFG_ERROR(%llx:%x): Invalid config space or offset\n",
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res->response_route, res->response_port);
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return;
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case TB_CFG_ERROR_NO_SUCH_PORT:
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/*
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* - The route contains a non-existent port.
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* - The route contains a non-PHY port (e.g. PCIe).
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* - The port in cfg_read/cfg_write does not exist.
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*/
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tb_ctl_WARN(ctl, "CFG_ERROR(%llx:%x): Invalid port\n",
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res->response_route, res->response_port);
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return;
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case TB_CFG_ERROR_LOOP:
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tb_ctl_WARN(ctl, "CFG_ERROR(%llx:%x): Route contains a loop\n",
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res->response_route, res->response_port);
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return;
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default:
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/* 5,6,7,9 and 11 are also valid error codes */
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tb_ctl_WARN(ctl, "CFG_ERROR(%llx:%x): Unknown error\n",
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res->response_route, res->response_port);
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return;
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}
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}
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static __be32 tb_crc(const void *data, size_t len)
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{
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return cpu_to_be32(~__crc32c_le(~0, data, len));
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}
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static void tb_ctl_pkg_free(struct ctl_pkg *pkg)
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{
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if (pkg) {
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dma_pool_free(pkg->ctl->frame_pool,
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pkg->buffer, pkg->frame.buffer_phy);
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kfree(pkg);
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}
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}
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static struct ctl_pkg *tb_ctl_pkg_alloc(struct tb_ctl *ctl)
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{
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struct ctl_pkg *pkg = kzalloc(sizeof(*pkg), GFP_KERNEL);
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if (!pkg)
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return NULL;
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pkg->ctl = ctl;
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pkg->buffer = dma_pool_alloc(ctl->frame_pool, GFP_KERNEL,
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&pkg->frame.buffer_phy);
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if (!pkg->buffer) {
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kfree(pkg);
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return NULL;
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}
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return pkg;
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}
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/* RX/TX handling */
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static void tb_ctl_tx_callback(struct tb_ring *ring, struct ring_frame *frame,
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bool canceled)
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{
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struct ctl_pkg *pkg = container_of(frame, typeof(*pkg), frame);
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tb_ctl_pkg_free(pkg);
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}
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/**
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* tb_cfg_tx() - transmit a packet on the control channel
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*
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* len must be a multiple of four.
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*
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* Return: Returns 0 on success or an error code on failure.
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*/
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static int tb_ctl_tx(struct tb_ctl *ctl, const void *data, size_t len,
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enum tb_cfg_pkg_type type)
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{
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int res;
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struct ctl_pkg *pkg;
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if (len % 4 != 0) { /* required for le->be conversion */
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tb_ctl_WARN(ctl, "TX: invalid size: %zu\n", len);
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return -EINVAL;
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}
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if (len > TB_FRAME_SIZE - 4) { /* checksum is 4 bytes */
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tb_ctl_WARN(ctl, "TX: packet too large: %zu/%d\n",
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len, TB_FRAME_SIZE - 4);
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return -EINVAL;
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}
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pkg = tb_ctl_pkg_alloc(ctl);
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if (!pkg)
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return -ENOMEM;
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pkg->frame.callback = tb_ctl_tx_callback;
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pkg->frame.size = len + 4;
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pkg->frame.sof = type;
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pkg->frame.eof = type;
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cpu_to_be32_array(pkg->buffer, data, len / 4);
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*(__be32 *) (pkg->buffer + len) = tb_crc(pkg->buffer, len);
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res = tb_ring_tx(ctl->tx, &pkg->frame);
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if (res) /* ring is stopped */
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tb_ctl_pkg_free(pkg);
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return res;
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}
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/**
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* tb_ctl_handle_event() - acknowledge a plug event, invoke ctl->callback
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*/
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static bool tb_ctl_handle_event(struct tb_ctl *ctl, enum tb_cfg_pkg_type type,
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struct ctl_pkg *pkg, size_t size)
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{
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return ctl->callback(ctl->callback_data, type, pkg->buffer, size);
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}
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static void tb_ctl_rx_submit(struct ctl_pkg *pkg)
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{
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tb_ring_rx(pkg->ctl->rx, &pkg->frame); /*
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* We ignore failures during stop.
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* All rx packets are referenced
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* from ctl->rx_packets, so we do
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* not loose them.
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*/
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}
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static int tb_async_error(const struct ctl_pkg *pkg)
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{
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const struct cfg_error_pkg *error = (const struct cfg_error_pkg *)pkg;
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if (pkg->frame.eof != TB_CFG_PKG_ERROR)
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return false;
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switch (error->error) {
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case TB_CFG_ERROR_LINK_ERROR:
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case TB_CFG_ERROR_HEC_ERROR_DETECTED:
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case TB_CFG_ERROR_FLOW_CONTROL_ERROR:
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return true;
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default:
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return false;
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}
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}
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static void tb_ctl_rx_callback(struct tb_ring *ring, struct ring_frame *frame,
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bool canceled)
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{
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struct ctl_pkg *pkg = container_of(frame, typeof(*pkg), frame);
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struct tb_cfg_request *req;
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__be32 crc32;
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if (canceled)
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return; /*
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* ring is stopped, packet is referenced from
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* ctl->rx_packets.
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*/
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if (frame->size < 4 || frame->size % 4 != 0) {
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tb_ctl_err(pkg->ctl, "RX: invalid size %#x, dropping packet\n",
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frame->size);
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goto rx;
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}
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frame->size -= 4; /* remove checksum */
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crc32 = tb_crc(pkg->buffer, frame->size);
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be32_to_cpu_array(pkg->buffer, pkg->buffer, frame->size / 4);
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switch (frame->eof) {
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case TB_CFG_PKG_READ:
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case TB_CFG_PKG_WRITE:
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case TB_CFG_PKG_ERROR:
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case TB_CFG_PKG_OVERRIDE:
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case TB_CFG_PKG_RESET:
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if (*(__be32 *)(pkg->buffer + frame->size) != crc32) {
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tb_ctl_err(pkg->ctl,
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"RX: checksum mismatch, dropping packet\n");
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goto rx;
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}
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if (tb_async_error(pkg)) {
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tb_ctl_handle_event(pkg->ctl, frame->eof,
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pkg, frame->size);
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goto rx;
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}
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break;
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case TB_CFG_PKG_EVENT:
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case TB_CFG_PKG_XDOMAIN_RESP:
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case TB_CFG_PKG_XDOMAIN_REQ:
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if (*(__be32 *)(pkg->buffer + frame->size) != crc32) {
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tb_ctl_err(pkg->ctl,
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"RX: checksum mismatch, dropping packet\n");
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goto rx;
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}
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/* Fall through */
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case TB_CFG_PKG_ICM_EVENT:
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if (tb_ctl_handle_event(pkg->ctl, frame->eof, pkg, frame->size))
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goto rx;
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break;
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default:
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break;
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}
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/*
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* The received packet will be processed only if there is an
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* active request and that the packet is what is expected. This
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* prevents packets such as replies coming after timeout has
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* triggered from messing with the active requests.
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*/
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req = tb_cfg_request_find(pkg->ctl, pkg);
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if (req) {
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if (req->copy(req, pkg))
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schedule_work(&req->work);
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tb_cfg_request_put(req);
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}
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rx:
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tb_ctl_rx_submit(pkg);
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}
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static void tb_cfg_request_work(struct work_struct *work)
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{
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struct tb_cfg_request *req = container_of(work, typeof(*req), work);
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if (!test_bit(TB_CFG_REQUEST_CANCELED, &req->flags))
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req->callback(req->callback_data);
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tb_cfg_request_dequeue(req);
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tb_cfg_request_put(req);
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}
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|
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/**
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* tb_cfg_request() - Start control request not waiting for it to complete
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* @ctl: Control channel to use
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* @req: Request to start
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* @callback: Callback called when the request is completed
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* @callback_data: Data to be passed to @callback
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*
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* This queues @req on the given control channel without waiting for it
|
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* to complete. When the request completes @callback is called.
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*/
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int tb_cfg_request(struct tb_ctl *ctl, struct tb_cfg_request *req,
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void (*callback)(void *), void *callback_data)
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|
{
|
|
int ret;
|
|
|
|
req->flags = 0;
|
|
req->callback = callback;
|
|
req->callback_data = callback_data;
|
|
INIT_WORK(&req->work, tb_cfg_request_work);
|
|
INIT_LIST_HEAD(&req->list);
|
|
|
|
tb_cfg_request_get(req);
|
|
ret = tb_cfg_request_enqueue(ctl, req);
|
|
if (ret)
|
|
goto err_put;
|
|
|
|
ret = tb_ctl_tx(ctl, req->request, req->request_size,
|
|
req->request_type);
|
|
if (ret)
|
|
goto err_dequeue;
|
|
|
|
if (!req->response)
|
|
schedule_work(&req->work);
|
|
|
|
return 0;
|
|
|
|
err_dequeue:
|
|
tb_cfg_request_dequeue(req);
|
|
err_put:
|
|
tb_cfg_request_put(req);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* tb_cfg_request_cancel() - Cancel a control request
|
|
* @req: Request to cancel
|
|
* @err: Error to assign to the request
|
|
*
|
|
* This function can be used to cancel ongoing request. It will wait
|
|
* until the request is not active anymore.
|
|
*/
|
|
void tb_cfg_request_cancel(struct tb_cfg_request *req, int err)
|
|
{
|
|
set_bit(TB_CFG_REQUEST_CANCELED, &req->flags);
|
|
schedule_work(&req->work);
|
|
wait_event(tb_cfg_request_cancel_queue, !tb_cfg_request_is_active(req));
|
|
req->result.err = err;
|
|
}
|
|
|
|
static void tb_cfg_request_complete(void *data)
|
|
{
|
|
complete(data);
|
|
}
|
|
|
|
/**
|
|
* tb_cfg_request_sync() - Start control request and wait until it completes
|
|
* @ctl: Control channel to use
|
|
* @req: Request to start
|
|
* @timeout_msec: Timeout how long to wait @req to complete
|
|
*
|
|
* Starts a control request and waits until it completes. If timeout
|
|
* triggers the request is canceled before function returns. Note the
|
|
* caller needs to make sure only one message for given switch is active
|
|
* at a time.
|
|
*/
|
|
struct tb_cfg_result tb_cfg_request_sync(struct tb_ctl *ctl,
|
|
struct tb_cfg_request *req,
|
|
int timeout_msec)
|
|
{
|
|
unsigned long timeout = msecs_to_jiffies(timeout_msec);
|
|
struct tb_cfg_result res = { 0 };
|
|
DECLARE_COMPLETION_ONSTACK(done);
|
|
int ret;
|
|
|
|
ret = tb_cfg_request(ctl, req, tb_cfg_request_complete, &done);
|
|
if (ret) {
|
|
res.err = ret;
|
|
return res;
|
|
}
|
|
|
|
if (!wait_for_completion_timeout(&done, timeout))
|
|
tb_cfg_request_cancel(req, -ETIMEDOUT);
|
|
|
|
flush_work(&req->work);
|
|
|
|
return req->result;
|
|
}
|
|
|
|
/* public interface, alloc/start/stop/free */
|
|
|
|
/**
|
|
* tb_ctl_alloc() - allocate a control channel
|
|
*
|
|
* cb will be invoked once for every hot plug event.
|
|
*
|
|
* Return: Returns a pointer on success or NULL on failure.
|
|
*/
|
|
struct tb_ctl *tb_ctl_alloc(struct tb_nhi *nhi, event_cb cb, void *cb_data)
|
|
{
|
|
int i;
|
|
struct tb_ctl *ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
|
|
if (!ctl)
|
|
return NULL;
|
|
ctl->nhi = nhi;
|
|
ctl->callback = cb;
|
|
ctl->callback_data = cb_data;
|
|
|
|
mutex_init(&ctl->request_queue_lock);
|
|
INIT_LIST_HEAD(&ctl->request_queue);
|
|
ctl->frame_pool = dma_pool_create("thunderbolt_ctl", &nhi->pdev->dev,
|
|
TB_FRAME_SIZE, 4, 0);
|
|
if (!ctl->frame_pool)
|
|
goto err;
|
|
|
|
ctl->tx = tb_ring_alloc_tx(nhi, 0, 10, RING_FLAG_NO_SUSPEND);
|
|
if (!ctl->tx)
|
|
goto err;
|
|
|
|
ctl->rx = tb_ring_alloc_rx(nhi, 0, 10, RING_FLAG_NO_SUSPEND, 0xffff,
|
|
0xffff, NULL, NULL);
|
|
if (!ctl->rx)
|
|
goto err;
|
|
|
|
for (i = 0; i < TB_CTL_RX_PKG_COUNT; i++) {
|
|
ctl->rx_packets[i] = tb_ctl_pkg_alloc(ctl);
|
|
if (!ctl->rx_packets[i])
|
|
goto err;
|
|
ctl->rx_packets[i]->frame.callback = tb_ctl_rx_callback;
|
|
}
|
|
|
|
tb_ctl_dbg(ctl, "control channel created\n");
|
|
return ctl;
|
|
err:
|
|
tb_ctl_free(ctl);
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* tb_ctl_free() - free a control channel
|
|
*
|
|
* Must be called after tb_ctl_stop.
|
|
*
|
|
* Must NOT be called from ctl->callback.
|
|
*/
|
|
void tb_ctl_free(struct tb_ctl *ctl)
|
|
{
|
|
int i;
|
|
|
|
if (!ctl)
|
|
return;
|
|
|
|
if (ctl->rx)
|
|
tb_ring_free(ctl->rx);
|
|
if (ctl->tx)
|
|
tb_ring_free(ctl->tx);
|
|
|
|
/* free RX packets */
|
|
for (i = 0; i < TB_CTL_RX_PKG_COUNT; i++)
|
|
tb_ctl_pkg_free(ctl->rx_packets[i]);
|
|
|
|
|
|
dma_pool_destroy(ctl->frame_pool);
|
|
kfree(ctl);
|
|
}
|
|
|
|
/**
|
|
* tb_cfg_start() - start/resume the control channel
|
|
*/
|
|
void tb_ctl_start(struct tb_ctl *ctl)
|
|
{
|
|
int i;
|
|
tb_ctl_dbg(ctl, "control channel starting...\n");
|
|
tb_ring_start(ctl->tx); /* is used to ack hotplug packets, start first */
|
|
tb_ring_start(ctl->rx);
|
|
for (i = 0; i < TB_CTL_RX_PKG_COUNT; i++)
|
|
tb_ctl_rx_submit(ctl->rx_packets[i]);
|
|
|
|
ctl->running = true;
|
|
}
|
|
|
|
/**
|
|
* control() - pause the control channel
|
|
*
|
|
* All invocations of ctl->callback will have finished after this method
|
|
* returns.
|
|
*
|
|
* Must NOT be called from ctl->callback.
|
|
*/
|
|
void tb_ctl_stop(struct tb_ctl *ctl)
|
|
{
|
|
mutex_lock(&ctl->request_queue_lock);
|
|
ctl->running = false;
|
|
mutex_unlock(&ctl->request_queue_lock);
|
|
|
|
tb_ring_stop(ctl->rx);
|
|
tb_ring_stop(ctl->tx);
|
|
|
|
if (!list_empty(&ctl->request_queue))
|
|
tb_ctl_WARN(ctl, "dangling request in request_queue\n");
|
|
INIT_LIST_HEAD(&ctl->request_queue);
|
|
tb_ctl_dbg(ctl, "control channel stopped\n");
|
|
}
|
|
|
|
/* public interface, commands */
|
|
|
|
/**
|
|
* tb_cfg_error() - send error packet
|
|
*
|
|
* Return: Returns 0 on success or an error code on failure.
|
|
*/
|
|
int tb_cfg_error(struct tb_ctl *ctl, u64 route, u32 port,
|
|
enum tb_cfg_error error)
|
|
{
|
|
struct cfg_error_pkg pkg = {
|
|
.header = tb_cfg_make_header(route),
|
|
.port = port,
|
|
.error = error,
|
|
};
|
|
tb_ctl_dbg(ctl, "resetting error on %llx:%x.\n", route, port);
|
|
return tb_ctl_tx(ctl, &pkg, sizeof(pkg), TB_CFG_PKG_ERROR);
|
|
}
|
|
|
|
static bool tb_cfg_match(const struct tb_cfg_request *req,
|
|
const struct ctl_pkg *pkg)
|
|
{
|
|
u64 route = tb_cfg_get_route(pkg->buffer) & ~BIT_ULL(63);
|
|
|
|
if (pkg->frame.eof == TB_CFG_PKG_ERROR)
|
|
return true;
|
|
|
|
if (pkg->frame.eof != req->response_type)
|
|
return false;
|
|
if (route != tb_cfg_get_route(req->request))
|
|
return false;
|
|
if (pkg->frame.size != req->response_size)
|
|
return false;
|
|
|
|
if (pkg->frame.eof == TB_CFG_PKG_READ ||
|
|
pkg->frame.eof == TB_CFG_PKG_WRITE) {
|
|
const struct cfg_read_pkg *req_hdr = req->request;
|
|
const struct cfg_read_pkg *res_hdr = pkg->buffer;
|
|
|
|
if (req_hdr->addr.seq != res_hdr->addr.seq)
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool tb_cfg_copy(struct tb_cfg_request *req, const struct ctl_pkg *pkg)
|
|
{
|
|
struct tb_cfg_result res;
|
|
|
|
/* Now make sure it is in expected format */
|
|
res = parse_header(pkg, req->response_size, req->response_type,
|
|
tb_cfg_get_route(req->request));
|
|
if (!res.err)
|
|
memcpy(req->response, pkg->buffer, req->response_size);
|
|
|
|
req->result = res;
|
|
|
|
/* Always complete when first response is received */
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* tb_cfg_reset() - send a reset packet and wait for a response
|
|
*
|
|
* If the switch at route is incorrectly configured then we will not receive a
|
|
* reply (even though the switch will reset). The caller should check for
|
|
* -ETIMEDOUT and attempt to reconfigure the switch.
|
|
*/
|
|
struct tb_cfg_result tb_cfg_reset(struct tb_ctl *ctl, u64 route,
|
|
int timeout_msec)
|
|
{
|
|
struct cfg_reset_pkg request = { .header = tb_cfg_make_header(route) };
|
|
struct tb_cfg_result res = { 0 };
|
|
struct tb_cfg_header reply;
|
|
struct tb_cfg_request *req;
|
|
|
|
req = tb_cfg_request_alloc();
|
|
if (!req) {
|
|
res.err = -ENOMEM;
|
|
return res;
|
|
}
|
|
|
|
req->match = tb_cfg_match;
|
|
req->copy = tb_cfg_copy;
|
|
req->request = &request;
|
|
req->request_size = sizeof(request);
|
|
req->request_type = TB_CFG_PKG_RESET;
|
|
req->response = &reply;
|
|
req->response_size = sizeof(reply);
|
|
req->response_type = TB_CFG_PKG_RESET;
|
|
|
|
res = tb_cfg_request_sync(ctl, req, timeout_msec);
|
|
|
|
tb_cfg_request_put(req);
|
|
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* tb_cfg_read() - read from config space into buffer
|
|
*
|
|
* Offset and length are in dwords.
|
|
*/
|
|
struct tb_cfg_result tb_cfg_read_raw(struct tb_ctl *ctl, void *buffer,
|
|
u64 route, u32 port, enum tb_cfg_space space,
|
|
u32 offset, u32 length, int timeout_msec)
|
|
{
|
|
struct tb_cfg_result res = { 0 };
|
|
struct cfg_read_pkg request = {
|
|
.header = tb_cfg_make_header(route),
|
|
.addr = {
|
|
.port = port,
|
|
.space = space,
|
|
.offset = offset,
|
|
.length = length,
|
|
},
|
|
};
|
|
struct cfg_write_pkg reply;
|
|
int retries = 0;
|
|
|
|
while (retries < TB_CTL_RETRIES) {
|
|
struct tb_cfg_request *req;
|
|
|
|
req = tb_cfg_request_alloc();
|
|
if (!req) {
|
|
res.err = -ENOMEM;
|
|
return res;
|
|
}
|
|
|
|
request.addr.seq = retries++;
|
|
|
|
req->match = tb_cfg_match;
|
|
req->copy = tb_cfg_copy;
|
|
req->request = &request;
|
|
req->request_size = sizeof(request);
|
|
req->request_type = TB_CFG_PKG_READ;
|
|
req->response = &reply;
|
|
req->response_size = 12 + 4 * length;
|
|
req->response_type = TB_CFG_PKG_READ;
|
|
|
|
res = tb_cfg_request_sync(ctl, req, timeout_msec);
|
|
|
|
tb_cfg_request_put(req);
|
|
|
|
if (res.err != -ETIMEDOUT)
|
|
break;
|
|
|
|
/* Wait a bit (arbitrary time) until we send a retry */
|
|
usleep_range(10, 100);
|
|
}
|
|
|
|
if (res.err)
|
|
return res;
|
|
|
|
res.response_port = reply.addr.port;
|
|
res.err = check_config_address(reply.addr, space, offset, length);
|
|
if (!res.err)
|
|
memcpy(buffer, &reply.data, 4 * length);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* tb_cfg_write() - write from buffer into config space
|
|
*
|
|
* Offset and length are in dwords.
|
|
*/
|
|
struct tb_cfg_result tb_cfg_write_raw(struct tb_ctl *ctl, const void *buffer,
|
|
u64 route, u32 port, enum tb_cfg_space space,
|
|
u32 offset, u32 length, int timeout_msec)
|
|
{
|
|
struct tb_cfg_result res = { 0 };
|
|
struct cfg_write_pkg request = {
|
|
.header = tb_cfg_make_header(route),
|
|
.addr = {
|
|
.port = port,
|
|
.space = space,
|
|
.offset = offset,
|
|
.length = length,
|
|
},
|
|
};
|
|
struct cfg_read_pkg reply;
|
|
int retries = 0;
|
|
|
|
memcpy(&request.data, buffer, length * 4);
|
|
|
|
while (retries < TB_CTL_RETRIES) {
|
|
struct tb_cfg_request *req;
|
|
|
|
req = tb_cfg_request_alloc();
|
|
if (!req) {
|
|
res.err = -ENOMEM;
|
|
return res;
|
|
}
|
|
|
|
request.addr.seq = retries++;
|
|
|
|
req->match = tb_cfg_match;
|
|
req->copy = tb_cfg_copy;
|
|
req->request = &request;
|
|
req->request_size = 12 + 4 * length;
|
|
req->request_type = TB_CFG_PKG_WRITE;
|
|
req->response = &reply;
|
|
req->response_size = sizeof(reply);
|
|
req->response_type = TB_CFG_PKG_WRITE;
|
|
|
|
res = tb_cfg_request_sync(ctl, req, timeout_msec);
|
|
|
|
tb_cfg_request_put(req);
|
|
|
|
if (res.err != -ETIMEDOUT)
|
|
break;
|
|
|
|
/* Wait a bit (arbitrary time) until we send a retry */
|
|
usleep_range(10, 100);
|
|
}
|
|
|
|
if (res.err)
|
|
return res;
|
|
|
|
res.response_port = reply.addr.port;
|
|
res.err = check_config_address(reply.addr, space, offset, length);
|
|
return res;
|
|
}
|
|
|
|
static int tb_cfg_get_error(struct tb_ctl *ctl, enum tb_cfg_space space,
|
|
const struct tb_cfg_result *res)
|
|
{
|
|
/*
|
|
* For unimplemented ports access to port config space may return
|
|
* TB_CFG_ERROR_INVALID_CONFIG_SPACE (alternatively their type is
|
|
* set to TB_TYPE_INACTIVE). In the former case return -ENODEV so
|
|
* that the caller can mark the port as disabled.
|
|
*/
|
|
if (space == TB_CFG_PORT &&
|
|
res->tb_error == TB_CFG_ERROR_INVALID_CONFIG_SPACE)
|
|
return -ENODEV;
|
|
|
|
tb_cfg_print_error(ctl, res);
|
|
return -EIO;
|
|
}
|
|
|
|
int tb_cfg_read(struct tb_ctl *ctl, void *buffer, u64 route, u32 port,
|
|
enum tb_cfg_space space, u32 offset, u32 length)
|
|
{
|
|
struct tb_cfg_result res = tb_cfg_read_raw(ctl, buffer, route, port,
|
|
space, offset, length, TB_CFG_DEFAULT_TIMEOUT);
|
|
switch (res.err) {
|
|
case 0:
|
|
/* Success */
|
|
break;
|
|
|
|
case 1:
|
|
/* Thunderbolt error, tb_error holds the actual number */
|
|
return tb_cfg_get_error(ctl, space, &res);
|
|
|
|
case -ETIMEDOUT:
|
|
tb_ctl_warn(ctl, "%llx: timeout reading config space %u from %#x\n",
|
|
route, space, offset);
|
|
break;
|
|
|
|
default:
|
|
WARN(1, "tb_cfg_read: %d\n", res.err);
|
|
break;
|
|
}
|
|
return res.err;
|
|
}
|
|
|
|
int tb_cfg_write(struct tb_ctl *ctl, const void *buffer, u64 route, u32 port,
|
|
enum tb_cfg_space space, u32 offset, u32 length)
|
|
{
|
|
struct tb_cfg_result res = tb_cfg_write_raw(ctl, buffer, route, port,
|
|
space, offset, length, TB_CFG_DEFAULT_TIMEOUT);
|
|
switch (res.err) {
|
|
case 0:
|
|
/* Success */
|
|
break;
|
|
|
|
case 1:
|
|
/* Thunderbolt error, tb_error holds the actual number */
|
|
return tb_cfg_get_error(ctl, space, &res);
|
|
|
|
case -ETIMEDOUT:
|
|
tb_ctl_warn(ctl, "%llx: timeout writing config space %u to %#x\n",
|
|
route, space, offset);
|
|
break;
|
|
|
|
default:
|
|
WARN(1, "tb_cfg_write: %d\n", res.err);
|
|
break;
|
|
}
|
|
return res.err;
|
|
}
|
|
|
|
/**
|
|
* tb_cfg_get_upstream_port() - get upstream port number of switch at route
|
|
*
|
|
* Reads the first dword from the switches TB_CFG_SWITCH config area and
|
|
* returns the port number from which the reply originated.
|
|
*
|
|
* Return: Returns the upstream port number on success or an error code on
|
|
* failure.
|
|
*/
|
|
int tb_cfg_get_upstream_port(struct tb_ctl *ctl, u64 route)
|
|
{
|
|
u32 dummy;
|
|
struct tb_cfg_result res = tb_cfg_read_raw(ctl, &dummy, route, 0,
|
|
TB_CFG_SWITCH, 0, 1,
|
|
TB_CFG_DEFAULT_TIMEOUT);
|
|
if (res.err == 1)
|
|
return -EIO;
|
|
if (res.err)
|
|
return res.err;
|
|
return res.response_port;
|
|
}
|