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, 167 deletions

diff --git a/arch/tile/include/asm/thread_info.h b/arch/tile/include/asm/thread_info.h
deleted file mode 100644
index 2adcacd85749..000000000000
--- a/arch/tile/include/asm/thread_info.h
+++ /dev/null
@@ -1,167 +0,0 @@
-/*
- * Copyright (C) 2002  David Howells (dhowells@redhat.com)
- * 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.
- */
-
-#ifndef _ASM_TILE_THREAD_INFO_H
-#define _ASM_TILE_THREAD_INFO_H
-
-#include <asm/processor.h>
-#include <asm/page.h>
-#ifndef __ASSEMBLY__
-
-/*
- * Low level task data that assembly code needs immediate access to.
- * The structure is placed at the bottom of the supervisor stack.
- */
-struct thread_info {
-	struct task_struct	*task;		/* main task structure */
-	unsigned long		flags;		/* low level flags */
-	unsigned long		status;		/* thread-synchronous flags */
-	__u32			homecache_cpu;	/* CPU we are homecached on */
-	__u32			cpu;		/* current CPU */
-	int			preempt_count;	/* 0 => preemptable,
-						   <0 => BUG */
-
-	mm_segment_t		addr_limit;	/* thread address space
-						   (KERNEL_DS or USER_DS) */
-	struct single_step_state *step_state;	/* single step state
-						   (if non-zero) */
-	int			align_ctl;	/* controls unaligned access */
-#ifdef __tilegx__
-	unsigned long		unalign_jit_tmp[4]; /* temp r0..r3 storage */
-	void __user		*unalign_jit_base; /* unalign fixup JIT base */
-#endif
-	bool in_backtrace;			/* currently doing backtrace? */
-};
-
-/*
- * macros/functions for gaining access to the thread information structure.
- */
-#define INIT_THREAD_INFO(tsk)			\
-{						\
-	.task		= &tsk,			\
-	.flags		= 0,			\
-	.cpu		= 0,			\
-	.preempt_count	= INIT_PREEMPT_COUNT,	\
-	.addr_limit	= KERNEL_DS,		\
-	.step_state	= NULL,			\
-	.align_ctl	= 0,			\
-}
-
-#endif /* !__ASSEMBLY__ */
-
-#if PAGE_SIZE < 8192
-#define THREAD_SIZE_ORDER (13 - PAGE_SHIFT)
-#else
-#define THREAD_SIZE_ORDER (0)
-#endif
-#define THREAD_SIZE_PAGES (1 << THREAD_SIZE_ORDER)
-
-#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
-#define LOG2_THREAD_SIZE (PAGE_SHIFT + THREAD_SIZE_ORDER)
-
-#define STACK_WARN             (THREAD_SIZE/8)
-
-#ifndef __ASSEMBLY__
-
-void arch_release_thread_stack(unsigned long *stack);
-
-/* How to get the thread information struct from C. */
-register unsigned long stack_pointer __asm__("sp");
-
-#define current_thread_info() \
-  ((struct thread_info *)(stack_pointer & -THREAD_SIZE))
-
-/* Sit on a nap instruction until interrupted. */
-extern void smp_nap(void);
-
-/* Enable interrupts racelessly and nap forever: helper for arch_cpu_idle(). */
-extern void _cpu_idle(void);
-
-#else /* __ASSEMBLY__ */
-
-/*
- * How to get the thread information struct from assembly.
- * Note that we use different macros since different architectures
- * have different semantics in their "mm" instruction and we would
- * like to guarantee that the macro expands to exactly one instruction.
- */
-#ifdef __tilegx__
-#define EXTRACT_THREAD_INFO(reg) mm reg, zero, LOG2_THREAD_SIZE, 63
-#else
-#define GET_THREAD_INFO(reg) mm reg, sp, zero, LOG2_THREAD_SIZE, 31
-#endif
-
-#endif /* !__ASSEMBLY__ */
-
-/*
- * Thread information flags that various assembly files may need to access.
- * Keep flags accessed frequently in low bits, particular since it makes
- * it easier to build constants in assembly.
- */
-#define TIF_SIGPENDING		0	/* signal pending */
-#define TIF_NEED_RESCHED	1	/* rescheduling necessary */
-#define TIF_SINGLESTEP		2	/* restore singlestep on return to
-					   user mode */
-#define TIF_ASYNC_TLB		3	/* got an async TLB fault in kernel */
-#define TIF_SYSCALL_TRACE	4	/* syscall trace active */
-#define TIF_SYSCALL_AUDIT	5	/* syscall auditing active */
-#define TIF_SECCOMP		6	/* secure computing */
-#define TIF_MEMDIE		7	/* OOM killer at work */
-#define TIF_NOTIFY_RESUME	8	/* callback before returning to user */
-#define TIF_SYSCALL_TRACEPOINT	9	/* syscall tracepoint instrumentation */
-#define TIF_POLLING_NRFLAG	10	/* idle is polling for TIF_NEED_RESCHED */
-#define TIF_NOHZ		11	/* in adaptive nohz mode */
-
-#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
-#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
-#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
-#define _TIF_ASYNC_TLB		(1<<TIF_ASYNC_TLB)
-#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
-#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
-#define _TIF_SECCOMP		(1<<TIF_SECCOMP)
-#define _TIF_MEMDIE		(1<<TIF_MEMDIE)
-#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
-#define _TIF_SYSCALL_TRACEPOINT	(1<<TIF_SYSCALL_TRACEPOINT)
-#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
-#define _TIF_NOHZ		(1<<TIF_NOHZ)
-
-/* Work to do as we loop to exit to user space. */
-#define _TIF_WORK_MASK \
-	(_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
-	 _TIF_ASYNC_TLB | _TIF_NOTIFY_RESUME)
-
-/* Work to do on any return to user space. */
-#define _TIF_ALLWORK_MASK \
-	(_TIF_WORK_MASK | _TIF_SINGLESTEP | _TIF_NOHZ)
-
-/* Work to do at syscall entry. */
-#define _TIF_SYSCALL_ENTRY_WORK \
-	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_NOHZ)
-
-/* Work to do at syscall exit. */
-#define _TIF_SYSCALL_EXIT_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT)
-
-/*
- * Thread-synchronous status.
- *
- * This is different from the flags in that nobody else
- * ever touches our thread-synchronous status, so we don't
- * have to worry about atomic accesses.
- */
-#ifdef __tilegx__
-#define TS_COMPAT		0x0001	/* 32-bit compatibility mode */
-#endif
-
-#endif /* _ASM_TILE_THREAD_INFO_H */