thunderbolt: Read port configuration from eeprom. (cd22e73b) · Commits · 戴 / test

drivers/thunderbolt/eeprom.c

+262 −4

Original line number	Diff line number	Diff line
		@@ -4,6 +4,7 @@
		* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
		*/

		#include <linux/crc32.h>
		#include "tb.h"

		/**
		@@ -152,9 +153,86 @@ static int tb_eeprom_read_n(struct tb_switch sw, u16 offset, u8 val,
		return tb_eeprom_active(sw, false);
		}

		int tb_eeprom_read_uid(struct tb_switch sw, u64 uid)
		static u8 tb_crc8(u8 *data, int len)
		{
		int i, j;
		u8 val = 0xff;
		for (i = 0; i < len; i++) {
		val ^= data[i];
		for (j = 0; j < 8; j++)
		val = (val << 1) ^ ((val & 0x80) ? 7 : 0);
		}
		return val;
		}

		static u32 tb_crc32(void *data, size_t len)
		{
		return ~__crc32c_le(~0, data, len);
		}

		#define TB_DROM_DATA_START 13
		struct tb_drom_header {
		/* BYTE 0 */
		u8 uid_crc8; /* checksum for uid */
		/* BYTES 1-8 */
		u64 uid;
		/* BYTES 9-12 */
		u32 data_crc32; /* checksum for data_len bytes starting at byte 13 */
		/* BYTE 13 */
		u8 device_rom_revision; /* should be <= 1 */
		u16 data_len:10;
		u8 __unknown1:6;
		/* BYTES 16-21 */
		u16 vendor_id;
		u16 model_id;
		u8 model_rev;
		u8 eeprom_rev;
		} __packed;

		enum tb_drom_entry_type {
		TB_DROM_ENTRY_GENERIC,
		TB_DROM_ENTRY_PORT,
		};

		struct tb_drom_entry_header {
		u8 len;
		u8 index:6;
		bool port_disabled:1; /* only valid if type is TB_DROM_ENTRY_PORT */
		enum tb_drom_entry_type type:1;
		} __packed;

		struct tb_drom_entry_port {
		/* BYTES 0-1 */
		struct tb_drom_entry_header header;
		/* BYTE 2 */
		u8 dual_link_port_rid:4;
		u8 link_nr:1;
		u8 unknown1:2;
		bool has_dual_link_port:1;

		/* BYTE 3 */
		u8 dual_link_port_nr:6;
		u8 unknown2:2;

		/* BYTES 4 - 5 TODO decode */
		u8 micro2:4;
		u8 micro1:4;
		u8 micro3;

		/* BYTES 5-6, TODO: verify (find hardware that has these set) */
		u8 peer_port_rid:4;
		u8 unknown3:3;
		bool has_peer_port:1;
		u8 peer_port_nr:6;
		u8 unknown4:2;
		} __packed;


		/**
		* tb_eeprom_get_drom_offset - get drom offset within eeprom
		*/
		int tb_eeprom_get_drom_offset(struct tb_switch sw, u16 offset)
		{
		u8 data[9];
		struct tb_cap_plug_events cap;
		int res;
		if (!sw->cap_plug_events) {
		@@ -165,6 +243,7 @@ int tb_eeprom_read_uid(struct tb_switch sw, u64 uid)
		sizeof(cap) / 4);
		if (res)
		return res;

		if (!cap.eeprom_ctl.present \|\| cap.eeprom_ctl.not_present) {
		tb_sw_warn(sw, "no NVM\n");
		return -ENOSYS;
		@@ -175,15 +254,194 @@ int tb_eeprom_read_uid(struct tb_switch sw, u64 uid)
		cap.drom_offset);
		return -ENXIO;
		}
		*offset = cap.drom_offset;
		return 0;
		}

		/**
		* tb_drom_read_uid_only - read uid directly from drom
		*
		* Does not use the cached copy in sw->drom. Used during resume to check switch
		* identity.
		*/
		int tb_drom_read_uid_only(struct tb_switch sw, u64 uid)
		{
		u8 data[9];
		u16 drom_offset;
		u8 crc;
		int res = tb_eeprom_get_drom_offset(sw, &drom_offset);
		if (res)
		return res;

		/* read uid */
		res = tb_eeprom_read_n(sw, cap.drom_offset, data, 9);
		res = tb_eeprom_read_n(sw, drom_offset, data, 9);
		if (res)
		return res;
		/* TODO: check checksum in data[0] */

		crc = tb_crc8(data + 1, 8);
		if (crc != data[0]) {
		tb_sw_warn(sw, "uid crc8 missmatch (expected: %#x, got: %#x)\n",
		data[0], crc);
		return -EIO;
		}

		uid = (u64 *)(data+1);
		return 0;
		}

		static void tb_drom_parse_port_entry(struct tb_port *port,
		struct tb_drom_entry_port *entry)
		{
		port->link_nr = entry->link_nr;
		if (entry->has_dual_link_port)
		port->dual_link_port =
		&port->sw->ports[entry->dual_link_port_nr];
		}

		static int tb_drom_parse_entry(struct tb_switch *sw,
		struct tb_drom_entry_header *header)
		{
		struct tb_port *port;
		int res;
		enum tb_port_type type;

		if (header->type != TB_DROM_ENTRY_PORT)
		return 0;

		port = &sw->ports[header->index];
		port->disabled = header->port_disabled;
		if (port->disabled)
		return 0;

		res = tb_port_read(port, &type, TB_CFG_PORT, 2, 1);
		if (res)
		return res;
		type &= 0xffffff;

		if (type == TB_TYPE_PORT) {
		struct tb_drom_entry_port entry = (void ) header;
		if (header->len != sizeof(*entry)) {
		tb_sw_warn(sw,
		"port entry has size %#x (expected %#lx)\n",
		header->len, sizeof(struct tb_drom_entry_port));
		return -EIO;
		}
		tb_drom_parse_port_entry(port, entry);
		}
		return 0;
		}

		/**
		* tb_drom_parse_entries - parse the linked list of drom entries
		*
		* Drom must have been copied to sw->drom.
		*/
		static int tb_drom_parse_entries(struct tb_switch *sw)
		{
		struct tb_drom_header header = (void ) sw->drom;
		u16 pos = sizeof(*header);
		u16 drom_size = header->data_len + TB_DROM_DATA_START;

		while (pos < drom_size) {
		struct tb_drom_entry_header entry = (void ) (sw->drom + pos);
		if (pos + 1 == drom_size \|\| pos + entry->len > drom_size
		\|\| !entry->len) {
		tb_sw_warn(sw, "drom buffer overrun, aborting\n");
		return -EIO;
		}

		tb_drom_parse_entry(sw, entry);

		pos += entry->len;
		}
		return 0;
		}

		/**
		* tb_drom_read - copy drom to sw->drom and parse it
		*/
		int tb_drom_read(struct tb_switch *sw)
		{
		u16 drom_offset;
		u16 size;
		u32 crc;
		struct tb_drom_header *header;
		int res;
		if (sw->drom)
		return 0;

		if (tb_route(sw) == 0) {
		/*
		* The root switch contains only a dummy drom (header only,
		* no entries). Hardcode the configuration here.
		*/
		tb_drom_read_uid_only(sw, &sw->uid);

		sw->ports[1].link_nr = 0;
		sw->ports[2].link_nr = 1;
		sw->ports[1].dual_link_port = &sw->ports[2];
		sw->ports[2].dual_link_port = &sw->ports[1];

		sw->ports[3].link_nr = 0;
		sw->ports[4].link_nr = 1;
		sw->ports[3].dual_link_port = &sw->ports[4];
		sw->ports[4].dual_link_port = &sw->ports[3];
		return 0;
		}

		res = tb_eeprom_get_drom_offset(sw, &drom_offset);
		if (res)
		return res;

		res = tb_eeprom_read_n(sw, drom_offset + 14, (u8 *) &size, 2);
		if (res)
		return res;
		size &= 0x3ff;
		size += TB_DROM_DATA_START;
		tb_sw_info(sw, "reading drom (length: %#x)\n", size);
		if (size < sizeof(*header)) {
		tb_sw_warn(sw, "drom too small, aborting\n");
		return -EIO;
		}

		sw->drom = kzalloc(size, GFP_KERNEL);
		if (!sw->drom)
		return -ENOMEM;
		res = tb_eeprom_read_n(sw, drom_offset, sw->drom, size);
		if (res)
		goto err;

		header = (void *) sw->drom;

		if (header->data_len + TB_DROM_DATA_START != size) {
		tb_sw_warn(sw, "drom size mismatch, aborting\n");
		goto err;
		}

		crc = tb_crc8((u8 *) &header->uid, 8);
		if (crc != header->uid_crc8) {
		tb_sw_warn(sw,
		"drom uid crc8 mismatch (expected: %#x, got: %#x), aborting\n",
		header->uid_crc8, crc);
		goto err;
		}
		sw->uid = header->uid;

		crc = tb_crc32(sw->drom + TB_DROM_DATA_START, header->data_len);
		if (crc != header->data_crc32) {
		tb_sw_warn(sw,
		"drom data crc32 mismatch (expected: %#x, got: %#x), aborting\n",
		header->data_crc32, crc);
		goto err;
		}

		if (header->device_rom_revision > 1)
		tb_sw_warn(sw, "drom device_rom_revision %#x unknown\n",
		header->device_rom_revision);

		return tb_drom_parse_entries(sw);
		err:
		kfree(sw->drom);
		return -EIO;

		}

drivers/thunderbolt/switch.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -400,7 +400,7 @@ struct tb_switch tb_switch_alloc(struct tb tb, u64 route)
		}
		sw->cap_plug_events = cap;

		if (tb_eeprom_read_uid(sw, &sw->uid))
		if (tb_drom_read_uid_only(sw, &sw->uid))
		tb_sw_warn(sw, "could not read uid from eeprom\n");
		else
		tb_sw_info(sw, "uid: %#llx\n", sw->uid);
		@@ -442,7 +442,7 @@ int tb_switch_resume(struct tb_switch *sw)
		u64 uid;
		tb_sw_info(sw, "resuming switch\n");

		err = tb_eeprom_read_uid(sw, &uid);
		err = tb_drom_read_uid_only(sw, &uid);
		if (err) {
		tb_sw_warn(sw, "uid read failed\n");
		return err;

drivers/thunderbolt/tb.h

+6 −1

Original line number	Diff line number	Diff line
		@@ -22,6 +22,7 @@ struct tb_switch {
		u64 uid;
		int cap_plug_events; /* offset, zero if not found */
		bool is_unplugged; /* unplugged, will go away */
		u8 *drom;
		};

		/**
		@@ -33,6 +34,9 @@ struct tb_port {
		struct tb_port remote; / remote port, NULL if not connected */
		int cap_phy; /* offset, zero if not found */
		u8 port; /* port number on switch */
		bool disabled; /* disabled by eeprom */
		struct tb_port *dual_link_port;
		u8 link_nr:1;
		};

		/**
		@@ -237,7 +241,8 @@ int tb_path_activate(struct tb_path *path);
		void tb_path_deactivate(struct tb_path *path);
		bool tb_path_is_invalid(struct tb_path *path);

		int tb_eeprom_read_uid(struct tb_switch sw, u64 uid);
		int tb_drom_read(struct tb_switch *sw);
		int tb_drom_read_uid_only(struct tb_switch sw, u64 uid);


		static inline int tb_route_length(u64 route)

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