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, 104 deletions

diff --git a/arch/tile/kernel/tlb.c b/arch/tile/kernel/tlb.c
deleted file mode 100644
index f23b53515671..000000000000
--- a/arch/tile/kernel/tlb.c
+++ /dev/null
@@ -1,104 +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.
- *
- */
-
-#include <linux/cpumask.h>
-#include <linux/module.h>
-#include <linux/hugetlb.h>
-#include <asm/tlbflush.h>
-#include <asm/homecache.h>
-#include <hv/hypervisor.h>
-
-/* From tlbflush.h */
-DEFINE_PER_CPU(int, current_asid);
-int min_asid, max_asid;
-
-/*
- * Note that we flush the L1I (for VM_EXEC pages) as well as the TLB
- * so that when we are unmapping an executable page, we also flush it.
- * Combined with flushing the L1I at context switch time, this means
- * we don't have to do any other icache flushes.
- */
-
-void flush_tlb_mm(struct mm_struct *mm)
-{
-	HV_Remote_ASID asids[NR_CPUS];
-	int i = 0, cpu;
-	for_each_cpu(cpu, mm_cpumask(mm)) {
-		HV_Remote_ASID *asid = &asids[i++];
-		asid->y = cpu / smp_topology.width;
-		asid->x = cpu % smp_topology.width;
-		asid->asid = per_cpu(current_asid, cpu);
-	}
-	flush_remote(0, HV_FLUSH_EVICT_L1I, mm_cpumask(mm),
-		     0, 0, 0, NULL, asids, i);
-}
-
-void flush_tlb_current_task(void)
-{
-	flush_tlb_mm(current->mm);
-}
-
-void flush_tlb_page_mm(struct vm_area_struct *vma, struct mm_struct *mm,
-		       unsigned long va)
-{
-	unsigned long size = vma_kernel_pagesize(vma);
-	int cache = (vma->vm_flags & VM_EXEC) ? HV_FLUSH_EVICT_L1I : 0;
-	flush_remote(0, cache, mm_cpumask(mm),
-		     va, size, size, mm_cpumask(mm), NULL, 0);
-}
-
-void flush_tlb_page(struct vm_area_struct *vma, unsigned long va)
-{
-	flush_tlb_page_mm(vma, vma->vm_mm, va);
-}
-EXPORT_SYMBOL(flush_tlb_page);
-
-void flush_tlb_range(struct vm_area_struct *vma,
-		     unsigned long start, unsigned long end)
-{
-	unsigned long size = vma_kernel_pagesize(vma);
-	struct mm_struct *mm = vma->vm_mm;
-	int cache = (vma->vm_flags & VM_EXEC) ? HV_FLUSH_EVICT_L1I : 0;
-	flush_remote(0, cache, mm_cpumask(mm), start, end - start, size,
-		     mm_cpumask(mm), NULL, 0);
-}
-
-void flush_tlb_all(void)
-{
-	int i;
-	for (i = 0; ; ++i) {
-		HV_VirtAddrRange r = hv_inquire_virtual(i);
-		if (r.size == 0)
-			break;
-		flush_remote(0, HV_FLUSH_EVICT_L1I, cpu_online_mask,
-			     r.start, r.size, PAGE_SIZE, cpu_online_mask,
-			     NULL, 0);
-		flush_remote(0, 0, NULL,
-			     r.start, r.size, HPAGE_SIZE, cpu_online_mask,
-			     NULL, 0);
-	}
-}
-
-/*
- * Callers need to flush the L1I themselves if necessary, e.g. for
- * kernel module unload.  Otherwise we assume callers are not using
- * executable pgprot_t's.  Using EVICT_L1I means that dataplane cpus
- * will get an unnecessary interrupt otherwise.
- */
-void flush_tlb_kernel_range(unsigned long start, unsigned long end)
-{
-	flush_remote(0, 0, NULL,
-		     start, end - start, PAGE_SIZE, cpu_online_mask, NULL, 0);
-}