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, 231 deletions

diff --git a/arch/tile/kernel/module.c b/arch/tile/kernel/module.c
deleted file mode 100644
index 09233fbe7801..000000000000
--- a/arch/tile/kernel/module.c
+++ /dev/null
@@ -1,231 +0,0 @@
-/*
- * Copyright 2010 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.
- *
- * Based on i386 version, copyright (C) 2001 Rusty Russell.
- */
-
-#include <linux/moduleloader.h>
-#include <linux/elf.h>
-#include <linux/vmalloc.h>
-#include <linux/fs.h>
-#include <linux/string.h>
-#include <linux/kernel.h>
-#include <asm/pgtable.h>
-#include <asm/homecache.h>
-#include <arch/opcode.h>
-
-#ifdef MODULE_DEBUG
-#define DEBUGP printk
-#else
-#define DEBUGP(fmt...)
-#endif
-
-/*
- * Allocate some address space in the range MEM_MODULE_START to
- * MEM_MODULE_END and populate it with memory.
- */
-void *module_alloc(unsigned long size)
-{
-	struct page **pages;
-	pgprot_t prot_rwx = __pgprot(_PAGE_KERNEL | _PAGE_KERNEL_EXEC);
-	struct vm_struct *area;
-	int i = 0;
-	int npages;
-
-	npages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
-	pages = kmalloc_array(npages, sizeof(*pages), GFP_KERNEL);
-	if (pages == NULL)
-		return NULL;
-	for (; i < npages; ++i) {
-		pages[i] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
-		if (!pages[i])
-			goto free_pages;
-	}
-
-	area = __get_vm_area(size, VM_ALLOC, MEM_MODULE_START, MEM_MODULE_END);
-	if (!area)
-		goto free_pages;
-	area->nr_pages = npages;
-	area->pages = pages;
-
-	if (map_vm_area(area, prot_rwx, pages)) {
-		vunmap(area->addr);
-		goto free_pages;
-	}
-
-	return area->addr;
- free_pages:
-	while (--i >= 0)
-		__free_page(pages[i]);
-	kfree(pages);
-	return NULL;
-}
-
-
-/* Free memory returned from module_alloc */
-void module_memfree(void *module_region)
-{
-	vfree(module_region);
-
-	/* Globally flush the L1 icache. */
-	flush_remote(0, HV_FLUSH_EVICT_L1I, cpu_online_mask,
-		     0, 0, 0, NULL, NULL, 0);
-
-	/*
-	 * FIXME: Add module_arch_freeing_init to trim exception
-	 * table entries.
-	 */
-}
-
-#ifdef __tilegx__
-/*
- * Validate that the high 16 bits of "value" is just the sign-extension of
- * the low 48 bits.
- */
-static int validate_hw2_last(long value, struct module *me)
-{
-	if (((value << 16) >> 16) != value) {
-		pr_warn("module %s: Out of range HW2_LAST value %#lx\n",
-			me->name, value);
-		return 0;
-	}
-	return 1;
-}
-
-/*
- * Validate that "value" isn't too big to hold in a JumpOff relocation.
- */
-static int validate_jumpoff(long value)
-{
-	/* Determine size of jump offset. */
-	int shift = __builtin_clzl(get_JumpOff_X1(create_JumpOff_X1(-1)));
-
-	/* Check to see if it fits into the relocation slot. */
-	long f = get_JumpOff_X1(create_JumpOff_X1(value));
-	f = (f << shift) >> shift;
-
-	return f == value;
-}
-#endif
-
-int apply_relocate_add(Elf_Shdr *sechdrs,
-		       const char *strtab,
-		       unsigned int symindex,
-		       unsigned int relsec,
-		       struct module *me)
-{
-	unsigned int i;
-	Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
-	Elf_Sym *sym;
-	u64 *location;
-	unsigned long value;
-
-	DEBUGP("Applying relocate section %u to %u\n", relsec,
-	       sechdrs[relsec].sh_info);
-	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
-		/* This is where to make the change */
-		location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
-			+ rel[i].r_offset;
-		/*
-		 * This is the symbol it is referring to.
-		 * Note that all undefined symbols have been resolved.
-		 */
-		sym = (Elf_Sym *)sechdrs[symindex].sh_addr
-			+ ELF_R_SYM(rel[i].r_info);
-		value = sym->st_value + rel[i].r_addend;
-
-		switch (ELF_R_TYPE(rel[i].r_info)) {
-
-#ifdef __LITTLE_ENDIAN
-# define MUNGE(func) \
-	(*location = ((*location & ~func(-1)) | func(value)))
-#else
-/*
- * Instructions are always little-endian, so when we read them as data,
- * we have to swap them around before and after modifying them.
- */
-# define MUNGE(func) \
-	(*location = swab64((swab64(*location) & ~func(-1)) | func(value)))
-#endif
-
-#ifndef __tilegx__
-		case R_TILE_32:
-			*(uint32_t *)location = value;
-			break;
-		case R_TILE_IMM16_X0_HA:
-			value = (value + 0x8000) >> 16;
-			/*FALLTHROUGH*/
-		case R_TILE_IMM16_X0_LO:
-			MUNGE(create_Imm16_X0);
-			break;
-		case R_TILE_IMM16_X1_HA:
-			value = (value + 0x8000) >> 16;
-			/*FALLTHROUGH*/
-		case R_TILE_IMM16_X1_LO:
-			MUNGE(create_Imm16_X1);
-			break;
-		case R_TILE_JOFFLONG_X1:
-			value -= (unsigned long) location;  /* pc-relative */
-			value = (long) value >> 3;     /* count by instrs */
-			MUNGE(create_JOffLong_X1);
-			break;
-#else
-		case R_TILEGX_64:
-			*location = value;
-			break;
-		case R_TILEGX_IMM16_X0_HW2_LAST:
-			if (!validate_hw2_last(value, me))
-				return -ENOEXEC;
-			value >>= 16;
-			/*FALLTHROUGH*/
-		case R_TILEGX_IMM16_X0_HW1:
-			value >>= 16;
-			/*FALLTHROUGH*/
-		case R_TILEGX_IMM16_X0_HW0:
-			MUNGE(create_Imm16_X0);
-			break;
-		case R_TILEGX_IMM16_X1_HW2_LAST:
-			if (!validate_hw2_last(value, me))
-				return -ENOEXEC;
-			value >>= 16;
-			/*FALLTHROUGH*/
-		case R_TILEGX_IMM16_X1_HW1:
-			value >>= 16;
-			/*FALLTHROUGH*/
-		case R_TILEGX_IMM16_X1_HW0:
-			MUNGE(create_Imm16_X1);
-			break;
-		case R_TILEGX_JUMPOFF_X1:
-			value -= (unsigned long) location;  /* pc-relative */
-			value = (long) value >> 3;     /* count by instrs */
-			if (!validate_jumpoff(value)) {
-				pr_warn("module %s: Out of range jump to %#llx at %#llx (%p)\n",
-					me->name,
-					sym->st_value + rel[i].r_addend,
-					rel[i].r_offset, location);
-				return -ENOEXEC;
-			}
-			MUNGE(create_JumpOff_X1);
-			break;
-#endif
-
-#undef MUNGE
-
-		default:
-			pr_err("module %s: Unknown relocation: %d\n",
-			       me->name, (int) ELF_R_TYPE(rel[i].r_info));
-			return -ENOEXEC;
-		}
-	}
-	return 0;
-}