arch: remove tile port

The Tile architecture port was added by Chris Metcalf in 2010, and
maintained until early 2018 when he orphaned it due to his departure
from Mellanox, and nobody else stepped up to maintain it. The product
line is still around in the form of the BlueField SoC, but no longer
uses the Tile architecture.

There are also still products for sale with Tile-GX SoCs, notably the
Mikrotik CCR router family. The products all use old (linux-3.3) kernels
with lots of patches and won't be upgraded by their manufacturers. There
have been efforts to port both OpenWRT and Debian to these, but both
projects have stalled and are very unlikely to be continued in the future.

Given that we are reasonably sure that nobody is still using the port
with an upstream kernel any more, it seems better to remove it now while
the port is in a good shape than to let it bitrot for a few years first.

Cc: Chris Metcalf <chris.d.metcalf@gmail.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Link: http://www.mellanox.com/page/npu_multicore_overview
Link: https://jenkins.debian.net/view/rebootstrap/job/rebootstrap_tilegx_gcc7/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 266 deletions

diff --git a/arch/tile/kernel/sysfs.c b/arch/tile/kernel/sysfs.c
deleted file mode 100644
index b09456a3d77a..000000000000
--- a/arch/tile/kernel/sysfs.c
+++ /dev/null
@@ -1,266 +0,0 @@
-/*
- * Copyright 2011 Tilera Corporation. All Rights Reserved.
- *
- *   This program is free software; you can redistribute it and/or
- *   modify it under the terms of the GNU General Public License
- *   as published by the Free Software Foundation, version 2.
- *
- *   This program is distributed in the hope that it will be useful, but
- *   WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- *   NON INFRINGEMENT.  See the GNU General Public License for
- *   more details.
- *
- * /sys entry support.
- */
-
-#include <linux/device.h>
-#include <linux/cpu.h>
-#include <linux/slab.h>
-#include <linux/smp.h>
-#include <linux/stat.h>
-#include <hv/hypervisor.h>
-
-/* Return a string queried from the hypervisor, truncated to page size. */
-static ssize_t get_hv_confstr(char *page, int query)
-{
-	ssize_t n = hv_confstr(query, (unsigned long)page, PAGE_SIZE - 1);
-	n = n < 0 ? 0 : min(n, (ssize_t)PAGE_SIZE - 1) - 1;
-	if (n)
-		page[n++] = '\n';
-	page[n] = '\0';
-	return n;
-}
-
-static ssize_t chip_width_show(struct device *dev,
-			       struct device_attribute *attr,
-			       char *page)
-{
-	return sprintf(page, "%u\n", smp_width);
-}
-static DEVICE_ATTR_RO(chip_width);
-
-static ssize_t chip_height_show(struct device *dev,
-				struct device_attribute *attr,
-				char *page)
-{
-	return sprintf(page, "%u\n", smp_height);
-}
-static DEVICE_ATTR_RO(chip_height);
-
-static ssize_t chip_serial_show(struct device *dev,
-				struct device_attribute *attr,
-				char *page)
-{
-	return get_hv_confstr(page, HV_CONFSTR_CHIP_SERIAL_NUM);
-}
-static DEVICE_ATTR_RO(chip_serial);
-
-static ssize_t chip_revision_show(struct device *dev,
-				  struct device_attribute *attr,
-				  char *page)
-{
-	return get_hv_confstr(page, HV_CONFSTR_CHIP_REV);
-}
-static DEVICE_ATTR_RO(chip_revision);
-
-
-static ssize_t type_show(struct device *dev,
-			    struct device_attribute *attr,
-			    char *page)
-{
-	return sprintf(page, "tilera\n");
-}
-static DEVICE_ATTR_RO(type);
-
-#define HV_CONF_ATTR(name, conf)					\
-	static ssize_t name ## _show(struct device *dev,		\
-				     struct device_attribute *attr, \
-				     char *page)			\
-	{								\
-		return get_hv_confstr(page, conf);			\
-	}								\
-	static DEVICE_ATTR(name, 0444, name ## _show, NULL);
-
-HV_CONF_ATTR(version,		HV_CONFSTR_HV_SW_VER)
-HV_CONF_ATTR(config_version,	HV_CONFSTR_HV_CONFIG_VER)
-
-HV_CONF_ATTR(board_part,	HV_CONFSTR_BOARD_PART_NUM)
-HV_CONF_ATTR(board_serial,	HV_CONFSTR_BOARD_SERIAL_NUM)
-HV_CONF_ATTR(board_revision,	HV_CONFSTR_BOARD_REV)
-HV_CONF_ATTR(board_description,	HV_CONFSTR_BOARD_DESC)
-HV_CONF_ATTR(mezz_part,		HV_CONFSTR_MEZZ_PART_NUM)
-HV_CONF_ATTR(mezz_serial,	HV_CONFSTR_MEZZ_SERIAL_NUM)
-HV_CONF_ATTR(mezz_revision,	HV_CONFSTR_MEZZ_REV)
-HV_CONF_ATTR(mezz_description,	HV_CONFSTR_MEZZ_DESC)
-HV_CONF_ATTR(cpumod_part,	HV_CONFSTR_CPUMOD_PART_NUM)
-HV_CONF_ATTR(cpumod_serial,	HV_CONFSTR_CPUMOD_SERIAL_NUM)
-HV_CONF_ATTR(cpumod_revision,	HV_CONFSTR_CPUMOD_REV)
-HV_CONF_ATTR(cpumod_description,HV_CONFSTR_CPUMOD_DESC)
-HV_CONF_ATTR(switch_control,	HV_CONFSTR_SWITCH_CONTROL)
-
-static struct attribute *board_attrs[] = {
-	&dev_attr_board_part.attr,
-	&dev_attr_board_serial.attr,
-	&dev_attr_board_revision.attr,
-	&dev_attr_board_description.attr,
-	&dev_attr_mezz_part.attr,
-	&dev_attr_mezz_serial.attr,
-	&dev_attr_mezz_revision.attr,
-	&dev_attr_mezz_description.attr,
-	&dev_attr_cpumod_part.attr,
-	&dev_attr_cpumod_serial.attr,
-	&dev_attr_cpumod_revision.attr,
-	&dev_attr_cpumod_description.attr,
-	&dev_attr_switch_control.attr,
-	NULL
-};
-
-static struct attribute_group board_attr_group = {
-	.name   = "board",
-	.attrs  = board_attrs,
-};
-
-
-static struct bin_attribute hvconfig_bin;
-
-static ssize_t
-hvconfig_bin_read(struct file *filp, struct kobject *kobj,
-		  struct bin_attribute *bin_attr,
-		  char *buf, loff_t off, size_t count)
-{
-	static size_t size;
-
-	/* Lazily learn the true size (minus the trailing NUL). */
-	if (size == 0)
-		size = hv_confstr(HV_CONFSTR_HV_CONFIG, 0, 0) - 1;
-
-	/* Check and adjust input parameters. */
-	if (off > size)
-		return -EINVAL;
-	if (count > size - off)
-		count = size - off;
-
-	if (count) {
-		/* Get a copy of the hvc and copy out the relevant portion. */
-		char *hvc;
-
-		size = off + count;
-		hvc = kmalloc(size, GFP_KERNEL);
-		if (hvc == NULL)
-			return -ENOMEM;
-		hv_confstr(HV_CONFSTR_HV_CONFIG, (unsigned long)hvc, size);
-		memcpy(buf, hvc + off, count);
-		kfree(hvc);
-	}
-
-	return count;
-}
-
-static ssize_t hv_stats_show(struct device *dev,
-			     struct device_attribute *attr,
-			     char *page)
-{
-	int cpu = dev->id;
-	long lotar = HV_XY_TO_LOTAR(cpu_x(cpu), cpu_y(cpu));
-
-	ssize_t n = hv_confstr(HV_CONFSTR_HV_STATS,
-			       (unsigned long)page, PAGE_SIZE - 1,
-			       lotar, 0);
-	n = n < 0 ? 0 : min(n, (ssize_t)PAGE_SIZE - 1);
-	page[n] = '\0';
-	return n;
-}
-
-static ssize_t hv_stats_store(struct device *dev,
-			      struct device_attribute *attr,
-			      const char *page,
-			      size_t count)
-{
-	int cpu = dev->id;
-	long lotar = HV_XY_TO_LOTAR(cpu_x(cpu), cpu_y(cpu));
-
-	ssize_t n = hv_confstr(HV_CONFSTR_HV_STATS, 0, 0, lotar, 1);
-	return n < 0 ? n : count;
-}
-
-static DEVICE_ATTR_RW(hv_stats);
-
-static int hv_stats_device_add(struct device *dev, struct subsys_interface *sif)
-{
-	int err, cpu = dev->id;
-
-	if (!cpu_online(cpu))
-		return 0;
-
-	err = sysfs_create_file(&dev->kobj, &dev_attr_hv_stats.attr);
-
-	return err;
-}
-
-static void hv_stats_device_remove(struct device *dev,
-				   struct subsys_interface *sif)
-{
-	int cpu = dev->id;
-
-	if (cpu_online(cpu))
-		sysfs_remove_file(&dev->kobj, &dev_attr_hv_stats.attr);
-}
-
-
-static struct subsys_interface hv_stats_interface = {
-	.name			= "hv_stats",
-	.subsys			= &cpu_subsys,
-	.add_dev		= hv_stats_device_add,
-	.remove_dev		= hv_stats_device_remove,
-};
-
-static int __init create_sysfs_entries(void)
-{
-	int err = 0;
-
-#define create_cpu_attr(name)						\
-	if (!err)							\
-		err = device_create_file(cpu_subsys.dev_root, &dev_attr_##name);
-	create_cpu_attr(chip_width);
-	create_cpu_attr(chip_height);
-	create_cpu_attr(chip_serial);
-	create_cpu_attr(chip_revision);
-
-#define create_hv_attr(name)						\
-	if (!err)							\
-		err = sysfs_create_file(hypervisor_kobj, &dev_attr_##name.attr);
-	create_hv_attr(type);
-	create_hv_attr(version);
-	create_hv_attr(config_version);
-
-	if (!err)
-		err = sysfs_create_group(hypervisor_kobj, &board_attr_group);
-
-	if (!err) {
-		sysfs_bin_attr_init(&hvconfig_bin);
-		hvconfig_bin.attr.name = "hvconfig";
-		hvconfig_bin.attr.mode = S_IRUGO;
-		hvconfig_bin.read = hvconfig_bin_read;
-		hvconfig_bin.size = PAGE_SIZE;
-		err = sysfs_create_bin_file(hypervisor_kobj, &hvconfig_bin);
-	}
-
-	if (!err) {
-		/*
-		 * Don't bother adding the hv_stats files on each CPU if
-		 * our hypervisor doesn't supply statistics.
-		 */
-		int cpu = raw_smp_processor_id();
-		long lotar = HV_XY_TO_LOTAR(cpu_x(cpu), cpu_y(cpu));
-		char dummy;
-		ssize_t n = hv_confstr(HV_CONFSTR_HV_STATS,
-				       (unsigned long) &dummy, 1,
-				       lotar, 0);
-		if (n >= 0)
-			err = subsys_interface_register(&hv_stats_interface);
-	}
-
-	return err;
-}
-subsys_initcall(create_sysfs_entries);