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432019d644
Use correct name in kernel-doc of tb_switch_find_by_uuid(). Signed-off-by: Radion Mirchevsky <radion.mirchevsky@intel.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
1558 lines
36 KiB
C
1558 lines
36 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Thunderbolt Cactus Ridge driver - switch/port utility functions
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*
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* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
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*/
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#include <linux/delay.h>
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#include <linux/idr.h>
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#include <linux/nvmem-provider.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include "tb.h"
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/* Switch authorization from userspace is serialized by this lock */
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static DEFINE_MUTEX(switch_lock);
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/* Switch NVM support */
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#define NVM_DEVID 0x05
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#define NVM_VERSION 0x08
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#define NVM_CSS 0x10
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#define NVM_FLASH_SIZE 0x45
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#define NVM_MIN_SIZE SZ_32K
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#define NVM_MAX_SIZE SZ_512K
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static DEFINE_IDA(nvm_ida);
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struct nvm_auth_status {
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struct list_head list;
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uuid_t uuid;
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u32 status;
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};
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/*
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* Hold NVM authentication failure status per switch This information
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* needs to stay around even when the switch gets power cycled so we
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* keep it separately.
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*/
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static LIST_HEAD(nvm_auth_status_cache);
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static DEFINE_MUTEX(nvm_auth_status_lock);
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static struct nvm_auth_status *__nvm_get_auth_status(const struct tb_switch *sw)
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{
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struct nvm_auth_status *st;
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list_for_each_entry(st, &nvm_auth_status_cache, list) {
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if (uuid_equal(&st->uuid, sw->uuid))
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return st;
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}
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return NULL;
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}
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static void nvm_get_auth_status(const struct tb_switch *sw, u32 *status)
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{
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struct nvm_auth_status *st;
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mutex_lock(&nvm_auth_status_lock);
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st = __nvm_get_auth_status(sw);
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mutex_unlock(&nvm_auth_status_lock);
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*status = st ? st->status : 0;
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}
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static void nvm_set_auth_status(const struct tb_switch *sw, u32 status)
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{
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struct nvm_auth_status *st;
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if (WARN_ON(!sw->uuid))
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return;
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mutex_lock(&nvm_auth_status_lock);
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st = __nvm_get_auth_status(sw);
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if (!st) {
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st = kzalloc(sizeof(*st), GFP_KERNEL);
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if (!st)
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goto unlock;
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memcpy(&st->uuid, sw->uuid, sizeof(st->uuid));
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INIT_LIST_HEAD(&st->list);
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list_add_tail(&st->list, &nvm_auth_status_cache);
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}
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st->status = status;
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unlock:
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mutex_unlock(&nvm_auth_status_lock);
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}
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static void nvm_clear_auth_status(const struct tb_switch *sw)
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{
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struct nvm_auth_status *st;
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mutex_lock(&nvm_auth_status_lock);
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st = __nvm_get_auth_status(sw);
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if (st) {
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list_del(&st->list);
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kfree(st);
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}
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mutex_unlock(&nvm_auth_status_lock);
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}
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static int nvm_validate_and_write(struct tb_switch *sw)
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{
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unsigned int image_size, hdr_size;
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const u8 *buf = sw->nvm->buf;
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u16 ds_size;
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int ret;
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if (!buf)
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return -EINVAL;
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image_size = sw->nvm->buf_data_size;
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if (image_size < NVM_MIN_SIZE || image_size > NVM_MAX_SIZE)
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return -EINVAL;
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/*
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* FARB pointer must point inside the image and must at least
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* contain parts of the digital section we will be reading here.
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*/
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hdr_size = (*(u32 *)buf) & 0xffffff;
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if (hdr_size + NVM_DEVID + 2 >= image_size)
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return -EINVAL;
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/* Digital section start should be aligned to 4k page */
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if (!IS_ALIGNED(hdr_size, SZ_4K))
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return -EINVAL;
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/*
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* Read digital section size and check that it also fits inside
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* the image.
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*/
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ds_size = *(u16 *)(buf + hdr_size);
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if (ds_size >= image_size)
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return -EINVAL;
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if (!sw->safe_mode) {
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u16 device_id;
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/*
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* Make sure the device ID in the image matches the one
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* we read from the switch config space.
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*/
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device_id = *(u16 *)(buf + hdr_size + NVM_DEVID);
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if (device_id != sw->config.device_id)
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return -EINVAL;
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if (sw->generation < 3) {
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/* Write CSS headers first */
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ret = dma_port_flash_write(sw->dma_port,
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DMA_PORT_CSS_ADDRESS, buf + NVM_CSS,
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DMA_PORT_CSS_MAX_SIZE);
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if (ret)
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return ret;
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}
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/* Skip headers in the image */
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buf += hdr_size;
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image_size -= hdr_size;
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}
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return dma_port_flash_write(sw->dma_port, 0, buf, image_size);
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}
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static int nvm_authenticate_host(struct tb_switch *sw)
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{
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int ret;
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/*
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* Root switch NVM upgrade requires that we disconnect the
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* existing paths first (in case it is not in safe mode
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* already).
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*/
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if (!sw->safe_mode) {
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ret = tb_domain_disconnect_all_paths(sw->tb);
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if (ret)
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return ret;
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/*
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* The host controller goes away pretty soon after this if
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* everything goes well so getting timeout is expected.
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*/
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ret = dma_port_flash_update_auth(sw->dma_port);
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return ret == -ETIMEDOUT ? 0 : ret;
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}
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/*
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* From safe mode we can get out by just power cycling the
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* switch.
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*/
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dma_port_power_cycle(sw->dma_port);
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return 0;
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}
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static int nvm_authenticate_device(struct tb_switch *sw)
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{
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int ret, retries = 10;
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ret = dma_port_flash_update_auth(sw->dma_port);
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if (ret && ret != -ETIMEDOUT)
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return ret;
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/*
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* Poll here for the authentication status. It takes some time
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* for the device to respond (we get timeout for a while). Once
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* we get response the device needs to be power cycled in order
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* to the new NVM to be taken into use.
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*/
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do {
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u32 status;
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ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
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if (ret < 0 && ret != -ETIMEDOUT)
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return ret;
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if (ret > 0) {
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if (status) {
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tb_sw_warn(sw, "failed to authenticate NVM\n");
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nvm_set_auth_status(sw, status);
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}
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tb_sw_info(sw, "power cycling the switch now\n");
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dma_port_power_cycle(sw->dma_port);
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return 0;
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}
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msleep(500);
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} while (--retries);
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return -ETIMEDOUT;
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}
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static int tb_switch_nvm_read(void *priv, unsigned int offset, void *val,
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size_t bytes)
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{
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struct tb_switch *sw = priv;
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return dma_port_flash_read(sw->dma_port, offset, val, bytes);
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}
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static int tb_switch_nvm_write(void *priv, unsigned int offset, void *val,
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size_t bytes)
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{
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struct tb_switch *sw = priv;
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int ret = 0;
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if (mutex_lock_interruptible(&switch_lock))
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return -ERESTARTSYS;
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/*
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* Since writing the NVM image might require some special steps,
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* for example when CSS headers are written, we cache the image
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* locally here and handle the special cases when the user asks
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* us to authenticate the image.
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*/
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if (!sw->nvm->buf) {
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sw->nvm->buf = vmalloc(NVM_MAX_SIZE);
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if (!sw->nvm->buf) {
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ret = -ENOMEM;
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goto unlock;
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}
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}
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sw->nvm->buf_data_size = offset + bytes;
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memcpy(sw->nvm->buf + offset, val, bytes);
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unlock:
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mutex_unlock(&switch_lock);
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return ret;
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}
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static struct nvmem_device *register_nvmem(struct tb_switch *sw, int id,
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size_t size, bool active)
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{
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struct nvmem_config config;
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memset(&config, 0, sizeof(config));
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if (active) {
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config.name = "nvm_active";
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config.reg_read = tb_switch_nvm_read;
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config.read_only = true;
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} else {
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config.name = "nvm_non_active";
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config.reg_write = tb_switch_nvm_write;
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config.root_only = true;
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}
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config.id = id;
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config.stride = 4;
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config.word_size = 4;
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config.size = size;
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config.dev = &sw->dev;
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config.owner = THIS_MODULE;
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config.priv = sw;
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return nvmem_register(&config);
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}
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static int tb_switch_nvm_add(struct tb_switch *sw)
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{
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struct nvmem_device *nvm_dev;
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struct tb_switch_nvm *nvm;
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u32 val;
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int ret;
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if (!sw->dma_port)
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return 0;
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nvm = kzalloc(sizeof(*nvm), GFP_KERNEL);
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if (!nvm)
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return -ENOMEM;
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nvm->id = ida_simple_get(&nvm_ida, 0, 0, GFP_KERNEL);
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/*
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* If the switch is in safe-mode the only accessible portion of
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* the NVM is the non-active one where userspace is expected to
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* write new functional NVM.
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*/
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if (!sw->safe_mode) {
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u32 nvm_size, hdr_size;
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ret = dma_port_flash_read(sw->dma_port, NVM_FLASH_SIZE, &val,
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sizeof(val));
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if (ret)
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goto err_ida;
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hdr_size = sw->generation < 3 ? SZ_8K : SZ_16K;
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nvm_size = (SZ_1M << (val & 7)) / 8;
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nvm_size = (nvm_size - hdr_size) / 2;
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ret = dma_port_flash_read(sw->dma_port, NVM_VERSION, &val,
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sizeof(val));
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if (ret)
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goto err_ida;
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nvm->major = val >> 16;
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nvm->minor = val >> 8;
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nvm_dev = register_nvmem(sw, nvm->id, nvm_size, true);
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if (IS_ERR(nvm_dev)) {
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ret = PTR_ERR(nvm_dev);
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goto err_ida;
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}
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nvm->active = nvm_dev;
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}
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nvm_dev = register_nvmem(sw, nvm->id, NVM_MAX_SIZE, false);
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if (IS_ERR(nvm_dev)) {
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ret = PTR_ERR(nvm_dev);
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goto err_nvm_active;
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}
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nvm->non_active = nvm_dev;
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mutex_lock(&switch_lock);
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sw->nvm = nvm;
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mutex_unlock(&switch_lock);
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return 0;
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err_nvm_active:
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if (nvm->active)
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nvmem_unregister(nvm->active);
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err_ida:
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ida_simple_remove(&nvm_ida, nvm->id);
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kfree(nvm);
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return ret;
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}
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static void tb_switch_nvm_remove(struct tb_switch *sw)
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{
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struct tb_switch_nvm *nvm;
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mutex_lock(&switch_lock);
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nvm = sw->nvm;
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sw->nvm = NULL;
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mutex_unlock(&switch_lock);
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if (!nvm)
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return;
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/* Remove authentication status in case the switch is unplugged */
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if (!nvm->authenticating)
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nvm_clear_auth_status(sw);
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nvmem_unregister(nvm->non_active);
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if (nvm->active)
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nvmem_unregister(nvm->active);
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ida_simple_remove(&nvm_ida, nvm->id);
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vfree(nvm->buf);
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kfree(nvm);
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}
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/* port utility functions */
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static const char *tb_port_type(struct tb_regs_port_header *port)
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{
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switch (port->type >> 16) {
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case 0:
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switch ((u8) port->type) {
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case 0:
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return "Inactive";
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case 1:
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return "Port";
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case 2:
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return "NHI";
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default:
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return "unknown";
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}
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case 0x2:
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return "Ethernet";
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case 0x8:
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return "SATA";
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case 0xe:
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return "DP/HDMI";
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case 0x10:
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return "PCIe";
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case 0x20:
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return "USB";
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default:
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return "unknown";
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}
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}
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static void tb_dump_port(struct tb *tb, struct tb_regs_port_header *port)
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{
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tb_info(tb,
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" Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
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port->port_number, port->vendor_id, port->device_id,
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port->revision, port->thunderbolt_version, tb_port_type(port),
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port->type);
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tb_info(tb, " Max hop id (in/out): %d/%d\n",
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port->max_in_hop_id, port->max_out_hop_id);
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tb_info(tb, " Max counters: %d\n", port->max_counters);
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tb_info(tb, " NFC Credits: %#x\n", port->nfc_credits);
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}
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/**
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* tb_port_state() - get connectedness state of a port
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*
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* The port must have a TB_CAP_PHY (i.e. it should be a real port).
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*
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* Return: Returns an enum tb_port_state on success or an error code on failure.
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*/
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static int tb_port_state(struct tb_port *port)
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{
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struct tb_cap_phy phy;
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int res;
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if (port->cap_phy == 0) {
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tb_port_WARN(port, "does not have a PHY\n");
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return -EINVAL;
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}
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res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);
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if (res)
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return res;
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return phy.state;
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}
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/**
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* tb_wait_for_port() - wait for a port to become ready
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*
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* Wait up to 1 second for a port to reach state TB_PORT_UP. If
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* wait_if_unplugged is set then we also wait if the port is in state
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* TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
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* switch resume). Otherwise we only wait if a device is registered but the link
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* has not yet been established.
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*
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* Return: Returns an error code on failure. Returns 0 if the port is not
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* connected or failed to reach state TB_PORT_UP within one second. Returns 1
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* if the port is connected and in state TB_PORT_UP.
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*/
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int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
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{
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int retries = 10;
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int state;
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if (!port->cap_phy) {
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tb_port_WARN(port, "does not have PHY\n");
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return -EINVAL;
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}
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if (tb_is_upstream_port(port)) {
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tb_port_WARN(port, "is the upstream port\n");
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return -EINVAL;
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}
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while (retries--) {
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state = tb_port_state(port);
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if (state < 0)
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return state;
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if (state == TB_PORT_DISABLED) {
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tb_port_info(port, "is disabled (state: 0)\n");
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return 0;
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}
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if (state == TB_PORT_UNPLUGGED) {
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if (wait_if_unplugged) {
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/* used during resume */
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tb_port_info(port,
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"is unplugged (state: 7), retrying...\n");
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msleep(100);
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continue;
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}
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tb_port_info(port, "is unplugged (state: 7)\n");
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return 0;
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}
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if (state == TB_PORT_UP) {
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tb_port_info(port,
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"is connected, link is up (state: 2)\n");
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return 1;
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}
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/*
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* After plug-in the state is TB_PORT_CONNECTING. Give it some
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* time.
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*/
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tb_port_info(port,
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"is connected, link is not up (state: %d), retrying...\n",
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state);
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msleep(100);
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}
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tb_port_warn(port,
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"failed to reach state TB_PORT_UP. Ignoring port...\n");
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return 0;
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}
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/**
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* tb_port_add_nfc_credits() - add/remove non flow controlled credits to port
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*
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* Change the number of NFC credits allocated to @port by @credits. To remove
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* NFC credits pass a negative amount of credits.
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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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int tb_port_add_nfc_credits(struct tb_port *port, int credits)
|
|
{
|
|
if (credits == 0)
|
|
return 0;
|
|
tb_port_info(port,
|
|
"adding %#x NFC credits (%#x -> %#x)",
|
|
credits,
|
|
port->config.nfc_credits,
|
|
port->config.nfc_credits + credits);
|
|
port->config.nfc_credits += credits;
|
|
return tb_port_write(port, &port->config.nfc_credits,
|
|
TB_CFG_PORT, 4, 1);
|
|
}
|
|
|
|
/**
|
|
* tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
|
|
*
|
|
* Return: Returns 0 on success or an error code on failure.
|
|
*/
|
|
int tb_port_clear_counter(struct tb_port *port, int counter)
|
|
{
|
|
u32 zero[3] = { 0, 0, 0 };
|
|
tb_port_info(port, "clearing counter %d\n", counter);
|
|
return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);
|
|
}
|
|
|
|
/**
|
|
* tb_init_port() - initialize a port
|
|
*
|
|
* This is a helper method for tb_switch_alloc. Does not check or initialize
|
|
* any downstream switches.
|
|
*
|
|
* Return: Returns 0 on success or an error code on failure.
|
|
*/
|
|
static int tb_init_port(struct tb_port *port)
|
|
{
|
|
int res;
|
|
int cap;
|
|
|
|
res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
|
|
if (res)
|
|
return res;
|
|
|
|
/* Port 0 is the switch itself and has no PHY. */
|
|
if (port->config.type == TB_TYPE_PORT && port->port != 0) {
|
|
cap = tb_port_find_cap(port, TB_PORT_CAP_PHY);
|
|
|
|
if (cap > 0)
|
|
port->cap_phy = cap;
|
|
else
|
|
tb_port_WARN(port, "non switch port without a PHY\n");
|
|
}
|
|
|
|
tb_dump_port(port->sw->tb, &port->config);
|
|
|
|
/* TODO: Read dual link port, DP port and more from EEPROM. */
|
|
return 0;
|
|
|
|
}
|
|
|
|
/* switch utility functions */
|
|
|
|
static void tb_dump_switch(struct tb *tb, struct tb_regs_switch_header *sw)
|
|
{
|
|
tb_info(tb,
|
|
" Switch: %x:%x (Revision: %d, TB Version: %d)\n",
|
|
sw->vendor_id, sw->device_id, sw->revision,
|
|
sw->thunderbolt_version);
|
|
tb_info(tb, " Max Port Number: %d\n", sw->max_port_number);
|
|
tb_info(tb, " Config:\n");
|
|
tb_info(tb,
|
|
" Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
|
|
sw->upstream_port_number, sw->depth,
|
|
(((u64) sw->route_hi) << 32) | sw->route_lo,
|
|
sw->enabled, sw->plug_events_delay);
|
|
tb_info(tb,
|
|
" unknown1: %#x unknown4: %#x\n",
|
|
sw->__unknown1, sw->__unknown4);
|
|
}
|
|
|
|
/**
|
|
* reset_switch() - reconfigure route, enable and send TB_CFG_PKG_RESET
|
|
*
|
|
* Return: Returns 0 on success or an error code on failure.
|
|
*/
|
|
int tb_switch_reset(struct tb *tb, u64 route)
|
|
{
|
|
struct tb_cfg_result res;
|
|
struct tb_regs_switch_header header = {
|
|
header.route_hi = route >> 32,
|
|
header.route_lo = route,
|
|
header.enabled = true,
|
|
};
|
|
tb_info(tb, "resetting switch at %llx\n", route);
|
|
res.err = tb_cfg_write(tb->ctl, ((u32 *) &header) + 2, route,
|
|
0, 2, 2, 2);
|
|
if (res.err)
|
|
return res.err;
|
|
res = tb_cfg_reset(tb->ctl, route, TB_CFG_DEFAULT_TIMEOUT);
|
|
if (res.err > 0)
|
|
return -EIO;
|
|
return res.err;
|
|
}
|
|
|
|
struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route)
|
|
{
|
|
u8 next_port = route; /*
|
|
* Routes use a stride of 8 bits,
|
|
* eventhough a port index has 6 bits at most.
|
|
* */
|
|
if (route == 0)
|
|
return sw;
|
|
if (next_port > sw->config.max_port_number)
|
|
return NULL;
|
|
if (tb_is_upstream_port(&sw->ports[next_port]))
|
|
return NULL;
|
|
if (!sw->ports[next_port].remote)
|
|
return NULL;
|
|
return get_switch_at_route(sw->ports[next_port].remote->sw,
|
|
route >> TB_ROUTE_SHIFT);
|
|
}
|
|
|
|
/**
|
|
* tb_plug_events_active() - enable/disable plug events on a switch
|
|
*
|
|
* Also configures a sane plug_events_delay of 255ms.
|
|
*
|
|
* Return: Returns 0 on success or an error code on failure.
|
|
*/
|
|
static int tb_plug_events_active(struct tb_switch *sw, bool active)
|
|
{
|
|
u32 data;
|
|
int res;
|
|
|
|
if (!sw->config.enabled)
|
|
return 0;
|
|
|
|
sw->config.plug_events_delay = 0xff;
|
|
res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
|
|
if (res)
|
|
return res;
|
|
|
|
res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
|
|
if (res)
|
|
return res;
|
|
|
|
if (active) {
|
|
data = data & 0xFFFFFF83;
|
|
switch (sw->config.device_id) {
|
|
case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
|
|
case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
|
|
case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
|
|
break;
|
|
default:
|
|
data |= 4;
|
|
}
|
|
} else {
|
|
data = data | 0x7c;
|
|
}
|
|
return tb_sw_write(sw, &data, TB_CFG_SWITCH,
|
|
sw->cap_plug_events + 1, 1);
|
|
}
|
|
|
|
static ssize_t authorized_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct tb_switch *sw = tb_to_switch(dev);
|
|
|
|
return sprintf(buf, "%u\n", sw->authorized);
|
|
}
|
|
|
|
static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (mutex_lock_interruptible(&switch_lock))
|
|
return -ERESTARTSYS;
|
|
|
|
if (sw->authorized)
|
|
goto unlock;
|
|
|
|
/*
|
|
* Make sure there is no PCIe rescan ongoing when a new PCIe
|
|
* tunnel is created. Otherwise the PCIe rescan code might find
|
|
* the new tunnel too early.
|
|
*/
|
|
pci_lock_rescan_remove();
|
|
|
|
switch (val) {
|
|
/* Approve switch */
|
|
case 1:
|
|
if (sw->key)
|
|
ret = tb_domain_approve_switch_key(sw->tb, sw);
|
|
else
|
|
ret = tb_domain_approve_switch(sw->tb, sw);
|
|
break;
|
|
|
|
/* Challenge switch */
|
|
case 2:
|
|
if (sw->key)
|
|
ret = tb_domain_challenge_switch_key(sw->tb, sw);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
pci_unlock_rescan_remove();
|
|
|
|
if (!ret) {
|
|
sw->authorized = val;
|
|
/* Notify status change to the userspace */
|
|
kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
|
|
}
|
|
|
|
unlock:
|
|
mutex_unlock(&switch_lock);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t authorized_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct tb_switch *sw = tb_to_switch(dev);
|
|
unsigned int val;
|
|
ssize_t ret;
|
|
|
|
ret = kstrtouint(buf, 0, &val);
|
|
if (ret)
|
|
return ret;
|
|
if (val > 2)
|
|
return -EINVAL;
|
|
|
|
ret = tb_switch_set_authorized(sw, val);
|
|
|
|
return ret ? ret : count;
|
|
}
|
|
static DEVICE_ATTR_RW(authorized);
|
|
|
|
static ssize_t device_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct tb_switch *sw = tb_to_switch(dev);
|
|
|
|
return sprintf(buf, "%#x\n", sw->device);
|
|
}
|
|
static DEVICE_ATTR_RO(device);
|
|
|
|
static ssize_t
|
|
device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct tb_switch *sw = tb_to_switch(dev);
|
|
|
|
return sprintf(buf, "%s\n", sw->device_name ? sw->device_name : "");
|
|
}
|
|
static DEVICE_ATTR_RO(device_name);
|
|
|
|
static ssize_t key_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct tb_switch *sw = tb_to_switch(dev);
|
|
ssize_t ret;
|
|
|
|
if (mutex_lock_interruptible(&switch_lock))
|
|
return -ERESTARTSYS;
|
|
|
|
if (sw->key)
|
|
ret = sprintf(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key);
|
|
else
|
|
ret = sprintf(buf, "\n");
|
|
|
|
mutex_unlock(&switch_lock);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t key_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct tb_switch *sw = tb_to_switch(dev);
|
|
u8 key[TB_SWITCH_KEY_SIZE];
|
|
ssize_t ret = count;
|
|
bool clear = false;
|
|
|
|
if (!strcmp(buf, "\n"))
|
|
clear = true;
|
|
else if (hex2bin(key, buf, sizeof(key)))
|
|
return -EINVAL;
|
|
|
|
if (mutex_lock_interruptible(&switch_lock))
|
|
return -ERESTARTSYS;
|
|
|
|
if (sw->authorized) {
|
|
ret = -EBUSY;
|
|
} else {
|
|
kfree(sw->key);
|
|
if (clear) {
|
|
sw->key = NULL;
|
|
} else {
|
|
sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
|
|
if (!sw->key)
|
|
ret = -ENOMEM;
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&switch_lock);
|
|
return ret;
|
|
}
|
|
static DEVICE_ATTR(key, 0600, key_show, key_store);
|
|
|
|
static ssize_t nvm_authenticate_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct tb_switch *sw = tb_to_switch(dev);
|
|
u32 status;
|
|
|
|
nvm_get_auth_status(sw, &status);
|
|
return sprintf(buf, "%#x\n", status);
|
|
}
|
|
|
|
static ssize_t nvm_authenticate_store(struct device *dev,
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct tb_switch *sw = tb_to_switch(dev);
|
|
bool val;
|
|
int ret;
|
|
|
|
if (mutex_lock_interruptible(&switch_lock))
|
|
return -ERESTARTSYS;
|
|
|
|
/* If NVMem devices are not yet added */
|
|
if (!sw->nvm) {
|
|
ret = -EAGAIN;
|
|
goto exit_unlock;
|
|
}
|
|
|
|
ret = kstrtobool(buf, &val);
|
|
if (ret)
|
|
goto exit_unlock;
|
|
|
|
/* Always clear the authentication status */
|
|
nvm_clear_auth_status(sw);
|
|
|
|
if (val) {
|
|
ret = nvm_validate_and_write(sw);
|
|
if (ret)
|
|
goto exit_unlock;
|
|
|
|
sw->nvm->authenticating = true;
|
|
|
|
if (!tb_route(sw))
|
|
ret = nvm_authenticate_host(sw);
|
|
else
|
|
ret = nvm_authenticate_device(sw);
|
|
}
|
|
|
|
exit_unlock:
|
|
mutex_unlock(&switch_lock);
|
|
|
|
if (ret)
|
|
return ret;
|
|
return count;
|
|
}
|
|
static DEVICE_ATTR_RW(nvm_authenticate);
|
|
|
|
static ssize_t nvm_version_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct tb_switch *sw = tb_to_switch(dev);
|
|
int ret;
|
|
|
|
if (mutex_lock_interruptible(&switch_lock))
|
|
return -ERESTARTSYS;
|
|
|
|
if (sw->safe_mode)
|
|
ret = -ENODATA;
|
|
else if (!sw->nvm)
|
|
ret = -EAGAIN;
|
|
else
|
|
ret = sprintf(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor);
|
|
|
|
mutex_unlock(&switch_lock);
|
|
|
|
return ret;
|
|
}
|
|
static DEVICE_ATTR_RO(nvm_version);
|
|
|
|
static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct tb_switch *sw = tb_to_switch(dev);
|
|
|
|
return sprintf(buf, "%#x\n", sw->vendor);
|
|
}
|
|
static DEVICE_ATTR_RO(vendor);
|
|
|
|
static ssize_t
|
|
vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct tb_switch *sw = tb_to_switch(dev);
|
|
|
|
return sprintf(buf, "%s\n", sw->vendor_name ? sw->vendor_name : "");
|
|
}
|
|
static DEVICE_ATTR_RO(vendor_name);
|
|
|
|
static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct tb_switch *sw = tb_to_switch(dev);
|
|
|
|
return sprintf(buf, "%pUb\n", sw->uuid);
|
|
}
|
|
static DEVICE_ATTR_RO(unique_id);
|
|
|
|
static struct attribute *switch_attrs[] = {
|
|
&dev_attr_authorized.attr,
|
|
&dev_attr_device.attr,
|
|
&dev_attr_device_name.attr,
|
|
&dev_attr_key.attr,
|
|
&dev_attr_nvm_authenticate.attr,
|
|
&dev_attr_nvm_version.attr,
|
|
&dev_attr_vendor.attr,
|
|
&dev_attr_vendor_name.attr,
|
|
&dev_attr_unique_id.attr,
|
|
NULL,
|
|
};
|
|
|
|
static umode_t switch_attr_is_visible(struct kobject *kobj,
|
|
struct attribute *attr, int n)
|
|
{
|
|
struct device *dev = container_of(kobj, struct device, kobj);
|
|
struct tb_switch *sw = tb_to_switch(dev);
|
|
|
|
if (attr == &dev_attr_key.attr) {
|
|
if (tb_route(sw) &&
|
|
sw->tb->security_level == TB_SECURITY_SECURE &&
|
|
sw->security_level == TB_SECURITY_SECURE)
|
|
return attr->mode;
|
|
return 0;
|
|
} else if (attr == &dev_attr_nvm_authenticate.attr ||
|
|
attr == &dev_attr_nvm_version.attr) {
|
|
if (sw->dma_port)
|
|
return attr->mode;
|
|
return 0;
|
|
}
|
|
|
|
return sw->safe_mode ? 0 : attr->mode;
|
|
}
|
|
|
|
static struct attribute_group switch_group = {
|
|
.is_visible = switch_attr_is_visible,
|
|
.attrs = switch_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *switch_groups[] = {
|
|
&switch_group,
|
|
NULL,
|
|
};
|
|
|
|
static void tb_switch_release(struct device *dev)
|
|
{
|
|
struct tb_switch *sw = tb_to_switch(dev);
|
|
|
|
dma_port_free(sw->dma_port);
|
|
|
|
kfree(sw->uuid);
|
|
kfree(sw->device_name);
|
|
kfree(sw->vendor_name);
|
|
kfree(sw->ports);
|
|
kfree(sw->drom);
|
|
kfree(sw->key);
|
|
kfree(sw);
|
|
}
|
|
|
|
struct device_type tb_switch_type = {
|
|
.name = "thunderbolt_device",
|
|
.release = tb_switch_release,
|
|
};
|
|
|
|
static int tb_switch_get_generation(struct tb_switch *sw)
|
|
{
|
|
switch (sw->config.device_id) {
|
|
case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
|
|
case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
|
|
case PCI_DEVICE_ID_INTEL_LIGHT_PEAK:
|
|
case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
|
|
case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
|
|
case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
|
|
case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE:
|
|
case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE:
|
|
return 1;
|
|
|
|
case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE:
|
|
case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
|
|
case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
|
|
return 2;
|
|
|
|
case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:
|
|
case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:
|
|
case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE:
|
|
case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:
|
|
case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:
|
|
return 3;
|
|
|
|
default:
|
|
/*
|
|
* For unknown switches assume generation to be 1 to be
|
|
* on the safe side.
|
|
*/
|
|
tb_sw_warn(sw, "unsupported switch device id %#x\n",
|
|
sw->config.device_id);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* tb_switch_alloc() - allocate a switch
|
|
* @tb: Pointer to the owning domain
|
|
* @parent: Parent device for this switch
|
|
* @route: Route string for this switch
|
|
*
|
|
* Allocates and initializes a switch. Will not upload configuration to
|
|
* the switch. For that you need to call tb_switch_configure()
|
|
* separately. The returned switch should be released by calling
|
|
* tb_switch_put().
|
|
*
|
|
* Return: Pointer to the allocated switch or %NULL in case of failure
|
|
*/
|
|
struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
|
|
u64 route)
|
|
{
|
|
int i;
|
|
int cap;
|
|
struct tb_switch *sw;
|
|
int upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
|
|
if (upstream_port < 0)
|
|
return NULL;
|
|
|
|
sw = kzalloc(sizeof(*sw), GFP_KERNEL);
|
|
if (!sw)
|
|
return NULL;
|
|
|
|
sw->tb = tb;
|
|
if (tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5))
|
|
goto err_free_sw_ports;
|
|
|
|
tb_info(tb, "current switch config:\n");
|
|
tb_dump_switch(tb, &sw->config);
|
|
|
|
/* configure switch */
|
|
sw->config.upstream_port_number = upstream_port;
|
|
sw->config.depth = tb_route_length(route);
|
|
sw->config.route_lo = route;
|
|
sw->config.route_hi = route >> 32;
|
|
sw->config.enabled = 0;
|
|
|
|
/* initialize ports */
|
|
sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
|
|
GFP_KERNEL);
|
|
if (!sw->ports)
|
|
goto err_free_sw_ports;
|
|
|
|
for (i = 0; i <= sw->config.max_port_number; i++) {
|
|
/* minimum setup for tb_find_cap and tb_drom_read to work */
|
|
sw->ports[i].sw = sw;
|
|
sw->ports[i].port = i;
|
|
}
|
|
|
|
sw->generation = tb_switch_get_generation(sw);
|
|
|
|
cap = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);
|
|
if (cap < 0) {
|
|
tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n");
|
|
goto err_free_sw_ports;
|
|
}
|
|
sw->cap_plug_events = cap;
|
|
|
|
/* Root switch is always authorized */
|
|
if (!route)
|
|
sw->authorized = true;
|
|
|
|
device_initialize(&sw->dev);
|
|
sw->dev.parent = parent;
|
|
sw->dev.bus = &tb_bus_type;
|
|
sw->dev.type = &tb_switch_type;
|
|
sw->dev.groups = switch_groups;
|
|
dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
|
|
|
|
return sw;
|
|
|
|
err_free_sw_ports:
|
|
kfree(sw->ports);
|
|
kfree(sw);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode
|
|
* @tb: Pointer to the owning domain
|
|
* @parent: Parent device for this switch
|
|
* @route: Route string for this switch
|
|
*
|
|
* This creates a switch in safe mode. This means the switch pretty much
|
|
* lacks all capabilities except DMA configuration port before it is
|
|
* flashed with a valid NVM firmware.
|
|
*
|
|
* The returned switch must be released by calling tb_switch_put().
|
|
*
|
|
* Return: Pointer to the allocated switch or %NULL in case of failure
|
|
*/
|
|
struct tb_switch *
|
|
tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route)
|
|
{
|
|
struct tb_switch *sw;
|
|
|
|
sw = kzalloc(sizeof(*sw), GFP_KERNEL);
|
|
if (!sw)
|
|
return NULL;
|
|
|
|
sw->tb = tb;
|
|
sw->config.depth = tb_route_length(route);
|
|
sw->config.route_hi = upper_32_bits(route);
|
|
sw->config.route_lo = lower_32_bits(route);
|
|
sw->safe_mode = true;
|
|
|
|
device_initialize(&sw->dev);
|
|
sw->dev.parent = parent;
|
|
sw->dev.bus = &tb_bus_type;
|
|
sw->dev.type = &tb_switch_type;
|
|
sw->dev.groups = switch_groups;
|
|
dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
|
|
|
|
return sw;
|
|
}
|
|
|
|
/**
|
|
* tb_switch_configure() - Uploads configuration to the switch
|
|
* @sw: Switch to configure
|
|
*
|
|
* Call this function before the switch is added to the system. It will
|
|
* upload configuration to the switch and makes it available for the
|
|
* connection manager to use.
|
|
*
|
|
* Return: %0 in case of success and negative errno in case of failure
|
|
*/
|
|
int tb_switch_configure(struct tb_switch *sw)
|
|
{
|
|
struct tb *tb = sw->tb;
|
|
u64 route;
|
|
int ret;
|
|
|
|
route = tb_route(sw);
|
|
tb_info(tb,
|
|
"initializing Switch at %#llx (depth: %d, up port: %d)\n",
|
|
route, tb_route_length(route), sw->config.upstream_port_number);
|
|
|
|
if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL)
|
|
tb_sw_warn(sw, "unknown switch vendor id %#x\n",
|
|
sw->config.vendor_id);
|
|
|
|
sw->config.enabled = 1;
|
|
|
|
/* upload configuration */
|
|
ret = tb_sw_write(sw, 1 + (u32 *)&sw->config, TB_CFG_SWITCH, 1, 3);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return tb_plug_events_active(sw, true);
|
|
}
|
|
|
|
static void tb_switch_set_uuid(struct tb_switch *sw)
|
|
{
|
|
u32 uuid[4];
|
|
int cap;
|
|
|
|
if (sw->uuid)
|
|
return;
|
|
|
|
/*
|
|
* The newer controllers include fused UUID as part of link
|
|
* controller specific registers
|
|
*/
|
|
cap = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER);
|
|
if (cap > 0) {
|
|
tb_sw_read(sw, uuid, TB_CFG_SWITCH, cap + 3, 4);
|
|
} else {
|
|
/*
|
|
* ICM generates UUID based on UID and fills the upper
|
|
* two words with ones. This is not strictly following
|
|
* UUID format but we want to be compatible with it so
|
|
* we do the same here.
|
|
*/
|
|
uuid[0] = sw->uid & 0xffffffff;
|
|
uuid[1] = (sw->uid >> 32) & 0xffffffff;
|
|
uuid[2] = 0xffffffff;
|
|
uuid[3] = 0xffffffff;
|
|
}
|
|
|
|
sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
|
|
}
|
|
|
|
static int tb_switch_add_dma_port(struct tb_switch *sw)
|
|
{
|
|
u32 status;
|
|
int ret;
|
|
|
|
switch (sw->generation) {
|
|
case 3:
|
|
break;
|
|
|
|
case 2:
|
|
/* Only root switch can be upgraded */
|
|
if (tb_route(sw))
|
|
return 0;
|
|
break;
|
|
|
|
default:
|
|
/*
|
|
* DMA port is the only thing available when the switch
|
|
* is in safe mode.
|
|
*/
|
|
if (!sw->safe_mode)
|
|
return 0;
|
|
break;
|
|
}
|
|
|
|
if (sw->no_nvm_upgrade)
|
|
return 0;
|
|
|
|
sw->dma_port = dma_port_alloc(sw);
|
|
if (!sw->dma_port)
|
|
return 0;
|
|
|
|
/*
|
|
* Check status of the previous flash authentication. If there
|
|
* is one we need to power cycle the switch in any case to make
|
|
* it functional again.
|
|
*/
|
|
ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
|
|
if (ret <= 0)
|
|
return ret;
|
|
|
|
if (status) {
|
|
tb_sw_info(sw, "switch flash authentication failed\n");
|
|
tb_switch_set_uuid(sw);
|
|
nvm_set_auth_status(sw, status);
|
|
}
|
|
|
|
tb_sw_info(sw, "power cycling the switch now\n");
|
|
dma_port_power_cycle(sw->dma_port);
|
|
|
|
/*
|
|
* We return error here which causes the switch adding failure.
|
|
* It should appear back after power cycle is complete.
|
|
*/
|
|
return -ESHUTDOWN;
|
|
}
|
|
|
|
/**
|
|
* tb_switch_add() - Add a switch to the domain
|
|
* @sw: Switch to add
|
|
*
|
|
* This is the last step in adding switch to the domain. It will read
|
|
* identification information from DROM and initializes ports so that
|
|
* they can be used to connect other switches. The switch will be
|
|
* exposed to the userspace when this function successfully returns. To
|
|
* remove and release the switch, call tb_switch_remove().
|
|
*
|
|
* Return: %0 in case of success and negative errno in case of failure
|
|
*/
|
|
int tb_switch_add(struct tb_switch *sw)
|
|
{
|
|
int i, ret;
|
|
|
|
/*
|
|
* Initialize DMA control port now before we read DROM. Recent
|
|
* host controllers have more complete DROM on NVM that includes
|
|
* vendor and model identification strings which we then expose
|
|
* to the userspace. NVM can be accessed through DMA
|
|
* configuration based mailbox.
|
|
*/
|
|
ret = tb_switch_add_dma_port(sw);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!sw->safe_mode) {
|
|
/* read drom */
|
|
ret = tb_drom_read(sw);
|
|
if (ret) {
|
|
tb_sw_warn(sw, "tb_eeprom_read_rom failed\n");
|
|
return ret;
|
|
}
|
|
tb_sw_info(sw, "uid: %#llx\n", sw->uid);
|
|
|
|
tb_switch_set_uuid(sw);
|
|
|
|
for (i = 0; i <= sw->config.max_port_number; i++) {
|
|
if (sw->ports[i].disabled) {
|
|
tb_port_info(&sw->ports[i], "disabled by eeprom\n");
|
|
continue;
|
|
}
|
|
ret = tb_init_port(&sw->ports[i]);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
ret = device_add(&sw->dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = tb_switch_nvm_add(sw);
|
|
if (ret)
|
|
device_del(&sw->dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* tb_switch_remove() - Remove and release a switch
|
|
* @sw: Switch to remove
|
|
*
|
|
* This will remove the switch from the domain and release it after last
|
|
* reference count drops to zero. If there are switches connected below
|
|
* this switch, they will be removed as well.
|
|
*/
|
|
void tb_switch_remove(struct tb_switch *sw)
|
|
{
|
|
int i;
|
|
|
|
/* port 0 is the switch itself and never has a remote */
|
|
for (i = 1; i <= sw->config.max_port_number; i++) {
|
|
if (tb_is_upstream_port(&sw->ports[i]))
|
|
continue;
|
|
if (sw->ports[i].remote)
|
|
tb_switch_remove(sw->ports[i].remote->sw);
|
|
sw->ports[i].remote = NULL;
|
|
if (sw->ports[i].xdomain)
|
|
tb_xdomain_remove(sw->ports[i].xdomain);
|
|
sw->ports[i].xdomain = NULL;
|
|
}
|
|
|
|
if (!sw->is_unplugged)
|
|
tb_plug_events_active(sw, false);
|
|
|
|
tb_switch_nvm_remove(sw);
|
|
device_unregister(&sw->dev);
|
|
}
|
|
|
|
/**
|
|
* tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
|
|
*/
|
|
void tb_sw_set_unplugged(struct tb_switch *sw)
|
|
{
|
|
int i;
|
|
if (sw == sw->tb->root_switch) {
|
|
tb_sw_WARN(sw, "cannot unplug root switch\n");
|
|
return;
|
|
}
|
|
if (sw->is_unplugged) {
|
|
tb_sw_WARN(sw, "is_unplugged already set\n");
|
|
return;
|
|
}
|
|
sw->is_unplugged = true;
|
|
for (i = 0; i <= sw->config.max_port_number; i++) {
|
|
if (!tb_is_upstream_port(&sw->ports[i]) && sw->ports[i].remote)
|
|
tb_sw_set_unplugged(sw->ports[i].remote->sw);
|
|
}
|
|
}
|
|
|
|
int tb_switch_resume(struct tb_switch *sw)
|
|
{
|
|
int i, err;
|
|
tb_sw_info(sw, "resuming switch\n");
|
|
|
|
/*
|
|
* Check for UID of the connected switches except for root
|
|
* switch which we assume cannot be removed.
|
|
*/
|
|
if (tb_route(sw)) {
|
|
u64 uid;
|
|
|
|
err = tb_drom_read_uid_only(sw, &uid);
|
|
if (err) {
|
|
tb_sw_warn(sw, "uid read failed\n");
|
|
return err;
|
|
}
|
|
if (sw->uid != uid) {
|
|
tb_sw_info(sw,
|
|
"changed while suspended (uid %#llx -> %#llx)\n",
|
|
sw->uid, uid);
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
|
|
/* upload configuration */
|
|
err = tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3);
|
|
if (err)
|
|
return err;
|
|
|
|
err = tb_plug_events_active(sw, true);
|
|
if (err)
|
|
return err;
|
|
|
|
/* check for surviving downstream switches */
|
|
for (i = 1; i <= sw->config.max_port_number; i++) {
|
|
struct tb_port *port = &sw->ports[i];
|
|
if (tb_is_upstream_port(port))
|
|
continue;
|
|
if (!port->remote)
|
|
continue;
|
|
if (tb_wait_for_port(port, true) <= 0
|
|
|| tb_switch_resume(port->remote->sw)) {
|
|
tb_port_warn(port,
|
|
"lost during suspend, disconnecting\n");
|
|
tb_sw_set_unplugged(port->remote->sw);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void tb_switch_suspend(struct tb_switch *sw)
|
|
{
|
|
int i, err;
|
|
err = tb_plug_events_active(sw, false);
|
|
if (err)
|
|
return;
|
|
|
|
for (i = 1; i <= sw->config.max_port_number; i++) {
|
|
if (!tb_is_upstream_port(&sw->ports[i]) && sw->ports[i].remote)
|
|
tb_switch_suspend(sw->ports[i].remote->sw);
|
|
}
|
|
/*
|
|
* TODO: invoke tb_cfg_prepare_to_sleep here? does not seem to have any
|
|
* effect?
|
|
*/
|
|
}
|
|
|
|
struct tb_sw_lookup {
|
|
struct tb *tb;
|
|
u8 link;
|
|
u8 depth;
|
|
const uuid_t *uuid;
|
|
};
|
|
|
|
static int tb_switch_match(struct device *dev, void *data)
|
|
{
|
|
struct tb_switch *sw = tb_to_switch(dev);
|
|
struct tb_sw_lookup *lookup = data;
|
|
|
|
if (!sw)
|
|
return 0;
|
|
if (sw->tb != lookup->tb)
|
|
return 0;
|
|
|
|
if (lookup->uuid)
|
|
return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid));
|
|
|
|
/* Root switch is matched only by depth */
|
|
if (!lookup->depth)
|
|
return !sw->depth;
|
|
|
|
return sw->link == lookup->link && sw->depth == lookup->depth;
|
|
}
|
|
|
|
/**
|
|
* tb_switch_find_by_link_depth() - Find switch by link and depth
|
|
* @tb: Domain the switch belongs
|
|
* @link: Link number the switch is connected
|
|
* @depth: Depth of the switch in link
|
|
*
|
|
* Returned switch has reference count increased so the caller needs to
|
|
* call tb_switch_put() when done with the switch.
|
|
*/
|
|
struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth)
|
|
{
|
|
struct tb_sw_lookup lookup;
|
|
struct device *dev;
|
|
|
|
memset(&lookup, 0, sizeof(lookup));
|
|
lookup.tb = tb;
|
|
lookup.link = link;
|
|
lookup.depth = depth;
|
|
|
|
dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
|
|
if (dev)
|
|
return tb_to_switch(dev);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* tb_switch_find_by_uuid() - Find switch by UUID
|
|
* @tb: Domain the switch belongs
|
|
* @uuid: UUID to look for
|
|
*
|
|
* Returned switch has reference count increased so the caller needs to
|
|
* call tb_switch_put() when done with the switch.
|
|
*/
|
|
struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid)
|
|
{
|
|
struct tb_sw_lookup lookup;
|
|
struct device *dev;
|
|
|
|
memset(&lookup, 0, sizeof(lookup));
|
|
lookup.tb = tb;
|
|
lookup.uuid = uuid;
|
|
|
|
dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
|
|
if (dev)
|
|
return tb_to_switch(dev);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void tb_switch_exit(void)
|
|
{
|
|
ida_destroy(&nvm_ida);
|
|
}
|