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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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65a792e84f
Add the arch-specific code to support jump label for TILE-Gx. This code shares NOP instruction with ftrace, so we move it to a common header file. Reviewed-by: Chris Metcalf <cmetcalf@ezchip.com> Signed-off-by: Zhigang Lu <zlu@ezchip.com> Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/*
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* Copyright 2015 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*
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* jump label TILE-Gx support
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*/
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#include <linux/jump_label.h>
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#include <linux/memory.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/cpu.h>
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#include <asm/cacheflush.h>
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#include <asm/insn.h>
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#ifdef HAVE_JUMP_LABEL
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static void __jump_label_transform(struct jump_entry *e,
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enum jump_label_type type)
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{
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tilegx_bundle_bits opcode;
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/* Operate on writable kernel text mapping. */
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unsigned long pc_wr = ktext_writable_addr(e->code);
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if (type == JUMP_LABEL_JMP)
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opcode = tilegx_gen_branch(e->code, e->target, false);
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else
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opcode = NOP();
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*(tilegx_bundle_bits *)pc_wr = opcode;
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/* Make sure that above mem writes were issued towards the memory. */
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smp_wmb();
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}
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void arch_jump_label_transform(struct jump_entry *e,
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enum jump_label_type type)
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{
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get_online_cpus();
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mutex_lock(&text_mutex);
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__jump_label_transform(e, type);
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flush_icache_range(e->code, e->code + sizeof(tilegx_bundle_bits));
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mutex_unlock(&text_mutex);
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put_online_cpus();
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}
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__init_or_module void arch_jump_label_transform_static(struct jump_entry *e,
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enum jump_label_type type)
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{
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__jump_label_transform(e, type);
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}
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#endif /* HAVE_JUMP_LABEL */
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