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, 298 deletions

diff --git a/arch/tile/kernel/machine_kexec.c b/arch/tile/kernel/machine_kexec.c
deleted file mode 100644
index 008aa2faef55..000000000000
--- a/arch/tile/kernel/machine_kexec.c
+++ /dev/null
@@ -1,298 +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 machine_kexec.c from other architectures in linux-2.6.18
- */
-
-#include <linux/mm.h>
-#include <linux/kexec.h>
-#include <linux/delay.h>
-#include <linux/reboot.h>
-#include <linux/errno.h>
-#include <linux/vmalloc.h>
-#include <linux/cpumask.h>
-#include <linux/kernel.h>
-#include <linux/elf.h>
-#include <linux/highmem.h>
-#include <linux/mmu_context.h>
-#include <linux/io.h>
-#include <linux/timex.h>
-#include <asm/pgtable.h>
-#include <asm/pgalloc.h>
-#include <asm/cacheflush.h>
-#include <asm/checksum.h>
-#include <asm/tlbflush.h>
-#include <asm/homecache.h>
-#include <hv/hypervisor.h>
-
-
-/*
- * This stuff is not in elf.h and is not in any other kernel include.
- * This stuff is needed below in the little boot notes parser to
- * extract the command line so we can pass it to the hypervisor.
- */
-struct Elf32_Bhdr {
-	Elf32_Word b_signature;
-	Elf32_Word b_size;
-	Elf32_Half b_checksum;
-	Elf32_Half b_records;
-};
-#define ELF_BOOT_MAGIC		0x0E1FB007
-#define EBN_COMMAND_LINE	0x00000004
-#define roundupsz(X) (((X) + 3) & ~3)
-
-/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
-
-
-void machine_shutdown(void)
-{
-	/*
-	 * Normally we would stop all the other processors here, but
-	 * the check in machine_kexec_prepare below ensures we'll only
-	 * get this far if we've been booted with "nosmp" on the
-	 * command line or without CONFIG_SMP so there's nothing to do
-	 * here (for now).
-	 */
-}
-
-void machine_crash_shutdown(struct pt_regs *regs)
-{
-	/*
-	 * Cannot happen.  This type of kexec is disabled on this
-	 * architecture (and enforced in machine_kexec_prepare below).
-	 */
-}
-
-
-int machine_kexec_prepare(struct kimage *image)
-{
-	if (num_online_cpus() > 1) {
-		pr_warn("%s: detected attempt to kexec with num_online_cpus() > 1\n",
-			__func__);
-		return -ENOSYS;
-	}
-	if (image->type != KEXEC_TYPE_DEFAULT) {
-		pr_warn("%s: detected attempt to kexec with unsupported type: %d\n",
-			__func__, image->type);
-		return -ENOSYS;
-	}
-	return 0;
-}
-
-void machine_kexec_cleanup(struct kimage *image)
-{
-	/*
-	 * We did nothing in machine_kexec_prepare,
-	 * so we have nothing to do here.
-	 */
-}
-
-/*
- * If we can find elf boot notes on this page, return the command
- * line.  Otherwise, silently return null.  Somewhat kludgy, but no
- * good way to do this without significantly rearchitecting the
- * architecture-independent kexec code.
- */
-
-static unsigned char *kexec_bn2cl(void *pg)
-{
-	struct Elf32_Bhdr *bhdrp;
-	Elf32_Nhdr *nhdrp;
-	unsigned char *desc;
-	unsigned char *command_line;
-	__sum16 csum;
-
-	bhdrp = (struct Elf32_Bhdr *) pg;
-
-	/*
-	 * This routine is invoked for every source page, so make
-	 * sure to quietly ignore every impossible page.
-	 */
-	if (bhdrp->b_signature != ELF_BOOT_MAGIC ||
-	    bhdrp->b_size > PAGE_SIZE)
-		return 0;
-
-	/*
-	 * If we get a checksum mismatch, warn with the checksum
-	 * so we can diagnose better.
-	 */
-	csum = ip_compute_csum(pg, bhdrp->b_size);
-	if (csum != 0) {
-		pr_warn("%s: bad checksum %#x (size %d)\n",
-			__func__, csum, bhdrp->b_size);
-		return 0;
-	}
-
-	nhdrp = (Elf32_Nhdr *) (bhdrp + 1);
-
-	while (nhdrp->n_type != EBN_COMMAND_LINE) {
-
-		desc = (unsigned char *) (nhdrp + 1);
-		desc += roundupsz(nhdrp->n_descsz);
-
-		nhdrp = (Elf32_Nhdr *) desc;
-
-		/* still in bounds? */
-		if ((unsigned char *) (nhdrp + 1) >
-		    ((unsigned char *) pg) + bhdrp->b_size) {
-
-			pr_info("%s: out of bounds\n", __func__);
-			return 0;
-		}
-	}
-
-	command_line = (unsigned char *) (nhdrp + 1);
-	desc = command_line;
-
-	while (*desc != '\0') {
-		desc++;
-		if (((unsigned long)desc & PAGE_MASK) != (unsigned long)pg) {
-			pr_info("%s: ran off end of page\n", __func__);
-			return 0;
-		}
-	}
-
-	return command_line;
-}
-
-static void kexec_find_and_set_command_line(struct kimage *image)
-{
-	kimage_entry_t *ptr, entry;
-
-	unsigned char *command_line = 0;
-	unsigned char *r;
-	HV_Errno hverr;
-
-	for (ptr = &image->head;
-	     (entry = *ptr) && !(entry & IND_DONE);
-	     ptr = (entry & IND_INDIRECTION) ?
-		     phys_to_virt((entry & PAGE_MASK)) : ptr + 1) {
-
-		if ((entry & IND_SOURCE)) {
-			void *va =
-				kmap_atomic_pfn(entry >> PAGE_SHIFT);
-			r = kexec_bn2cl(va);
-			if (r) {
-				command_line = r;
-				break;
-			}
-			kunmap_atomic(va);
-		}
-	}
-
-	if (command_line != 0) {
-		pr_info("setting new command line to \"%s\"\n", command_line);
-
-		hverr = hv_set_command_line(
-			(HV_VirtAddr) command_line, strlen(command_line));
-		kunmap_atomic(command_line);
-	} else {
-		pr_info("%s: no command line found; making empty\n", __func__);
-		hverr = hv_set_command_line((HV_VirtAddr) command_line, 0);
-	}
-	if (hverr)
-		pr_warn("%s: hv_set_command_line returned error: %d\n",
-			__func__, hverr);
-}
-
-/*
- * The kexec code range-checks all its PAs, so to avoid having it run
- * amok and allocate memory and then sequester it from every other
- * controller, we force it to come from controller zero.  We also
- * disable the oom-killer since if we do end up running out of memory,
- * that almost certainly won't help.
- */
-struct page *kimage_alloc_pages_arch(gfp_t gfp_mask, unsigned int order)
-{
-	gfp_mask |= __GFP_THISNODE | __GFP_NORETRY;
-	return alloc_pages_node(0, gfp_mask, order);
-}
-
-/*
- * Address range in which pa=va mapping is set in setup_quasi_va_is_pa().
- * For tilepro, PAGE_OFFSET is used since this is the largest possbile value
- * for tilepro, while for tilegx, we limit it to entire middle level page
- * table which we assume has been allocated and is undoubtedly large enough.
- */
-#ifndef __tilegx__
-#define	QUASI_VA_IS_PA_ADDR_RANGE PAGE_OFFSET
-#else
-#define	QUASI_VA_IS_PA_ADDR_RANGE PGDIR_SIZE
-#endif
-
-static void setup_quasi_va_is_pa(void)
-{
-	HV_PTE pte;
-	unsigned long i;
-
-	/*
-	 * Flush our TLB to prevent conflicts between the previous contents
-	 * and the new stuff we're about to add.
-	 */
-	local_flush_tlb_all();
-
-	/*
-	 * setup VA is PA, at least up to QUASI_VA_IS_PA_ADDR_RANGE.
-	 * Note here we assume that level-1 page table is defined by
-	 * HPAGE_SIZE.
-	 */
-	pte = hv_pte(_PAGE_KERNEL | _PAGE_HUGE_PAGE);
-	pte = hv_pte_set_mode(pte, HV_PTE_MODE_CACHE_NO_L3);
-	for (i = 0; i < (QUASI_VA_IS_PA_ADDR_RANGE >> HPAGE_SHIFT); i++) {
-		unsigned long vaddr = i << HPAGE_SHIFT;
-		pgd_t *pgd = pgd_offset(current->mm, vaddr);
-		pud_t *pud = pud_offset(pgd, vaddr);
-		pte_t *ptep = (pte_t *) pmd_offset(pud, vaddr);
-		unsigned long pfn = i << (HPAGE_SHIFT - PAGE_SHIFT);
-
-		if (pfn_valid(pfn))
-			__set_pte(ptep, pfn_pte(pfn, pte));
-	}
-}
-
-
-void machine_kexec(struct kimage *image)
-{
-	void *reboot_code_buffer;
-	pte_t *ptep;
-	void (*rnk)(unsigned long, void *, unsigned long)
-		__noreturn;
-
-	/* Mask all interrupts before starting to reboot. */
-	interrupt_mask_set_mask(~0ULL);
-
-	kexec_find_and_set_command_line(image);
-
-	/*
-	 * Adjust the home caching of the control page to be cached on
-	 * this cpu, and copy the assembly helper into the control
-	 * code page, which we map in the vmalloc area.
-	 */
-	homecache_change_page_home(image->control_code_page, 0,
-				   smp_processor_id());
-	reboot_code_buffer = page_address(image->control_code_page);
-	BUG_ON(reboot_code_buffer == NULL);
-	ptep = virt_to_pte(NULL, (unsigned long)reboot_code_buffer);
-	__set_pte(ptep, pte_mkexec(*ptep));
-	memcpy(reboot_code_buffer, relocate_new_kernel,
-	       relocate_new_kernel_size);
-	__flush_icache_range(
-		(unsigned long) reboot_code_buffer,
-		(unsigned long) reboot_code_buffer + relocate_new_kernel_size);
-
-	setup_quasi_va_is_pa();
-
-	/* now call it */
-	rnk = reboot_code_buffer;
-	(*rnk)(image->head, reboot_code_buffer, image->start);
-}