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bda0f5bad8
This change improves and cleans up the tile console. - We enable HVC_IRQ support on tilegx, with the addition of a new Tilera hypervisor API for tilegx to allow a console IPI. If IPI support is not available we fall back to the previous polling mode. - We simplify the earlyprintk code to use CON_BOOT and eliminate some of the other supporting earlyprintk code. - A new tile_console_write() primitive is used to send output to the console and is factored out of the hvc_tile driver. This lets us support a "sim_console" boot argument to allow using simulator hooks to send output to the "console" as a slightly faster alternative to emulating the hardware more directly. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
206 lines
4.6 KiB
C
206 lines
4.6 KiB
C
/*
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* Copyright 2010 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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* Tilera TILE Processor hypervisor console
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*/
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#include <linux/console.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/moduleparam.h>
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#include <linux/platform_device.h>
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#include <linux/types.h>
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#include <asm/setup.h>
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#include <arch/sim_def.h>
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#include <hv/hypervisor.h>
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#include "hvc_console.h"
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static int use_sim_console;
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static int __init sim_console(char *str)
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{
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use_sim_console = 1;
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return 0;
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}
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early_param("sim_console", sim_console);
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int tile_console_write(const char *buf, int count)
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{
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if (unlikely(use_sim_console)) {
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int i;
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for (i = 0; i < count; ++i)
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__insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_PUTC |
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(buf[i] << _SIM_CONTROL_OPERATOR_BITS));
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__insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_PUTC |
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(SIM_PUTC_FLUSH_BINARY <<
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_SIM_CONTROL_OPERATOR_BITS));
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return 0;
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} else {
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return hv_console_write((HV_VirtAddr)buf, count);
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}
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}
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static int hvc_tile_put_chars(uint32_t vt, const char *buf, int count)
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{
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return tile_console_write(buf, count);
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}
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static int hvc_tile_get_chars(uint32_t vt, char *buf, int count)
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{
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int i, c;
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for (i = 0; i < count; ++i) {
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c = hv_console_read_if_ready();
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if (c < 0)
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break;
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buf[i] = c;
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}
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return i;
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}
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#ifdef __tilegx__
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/*
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* IRQ based callbacks.
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*/
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static int hvc_tile_notifier_add_irq(struct hvc_struct *hp, int irq)
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{
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int rc;
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int cpu = raw_smp_processor_id(); /* Choose an arbitrary cpu */
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HV_Coord coord = { .x = cpu_x(cpu), .y = cpu_y(cpu) };
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rc = notifier_add_irq(hp, irq);
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if (rc)
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return rc;
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/*
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* Request that the hypervisor start sending us interrupts.
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* If the hypervisor returns an error, we still return 0, so that
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* we can fall back to polling.
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*/
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if (hv_console_set_ipi(KERNEL_PL, irq, coord) < 0)
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notifier_del_irq(hp, irq);
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return 0;
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}
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static void hvc_tile_notifier_del_irq(struct hvc_struct *hp, int irq)
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{
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HV_Coord coord = { 0, 0 };
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/* Tell the hypervisor to stop sending us interrupts. */
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hv_console_set_ipi(KERNEL_PL, -1, coord);
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notifier_del_irq(hp, irq);
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}
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static void hvc_tile_notifier_hangup_irq(struct hvc_struct *hp, int irq)
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{
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hvc_tile_notifier_del_irq(hp, irq);
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}
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#endif
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static const struct hv_ops hvc_tile_get_put_ops = {
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.get_chars = hvc_tile_get_chars,
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.put_chars = hvc_tile_put_chars,
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#ifdef __tilegx__
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.notifier_add = hvc_tile_notifier_add_irq,
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.notifier_del = hvc_tile_notifier_del_irq,
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.notifier_hangup = hvc_tile_notifier_hangup_irq,
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#endif
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};
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#ifdef __tilegx__
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static int hvc_tile_probe(struct platform_device *pdev)
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{
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struct hvc_struct *hp;
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int tile_hvc_irq;
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/* Create our IRQ and register it. */
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tile_hvc_irq = create_irq();
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if (tile_hvc_irq < 0)
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return -ENXIO;
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tile_irq_activate(tile_hvc_irq, TILE_IRQ_PERCPU);
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hp = hvc_alloc(0, tile_hvc_irq, &hvc_tile_get_put_ops, 128);
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if (IS_ERR(hp)) {
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destroy_irq(tile_hvc_irq);
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return PTR_ERR(hp);
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}
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dev_set_drvdata(&pdev->dev, hp);
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return 0;
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}
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static int hvc_tile_remove(struct platform_device *pdev)
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{
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int rc;
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struct hvc_struct *hp = dev_get_drvdata(&pdev->dev);
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rc = hvc_remove(hp);
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if (rc == 0)
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destroy_irq(hp->data);
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return rc;
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}
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static void hvc_tile_shutdown(struct platform_device *pdev)
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{
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struct hvc_struct *hp = dev_get_drvdata(&pdev->dev);
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hvc_tile_notifier_del_irq(hp, hp->data);
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}
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static struct platform_device hvc_tile_pdev = {
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.name = "hvc-tile",
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.id = 0,
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};
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static struct platform_driver hvc_tile_driver = {
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.probe = hvc_tile_probe,
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.remove = hvc_tile_remove,
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.shutdown = hvc_tile_shutdown,
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.driver = {
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.name = "hvc-tile",
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.owner = THIS_MODULE,
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}
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};
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#endif
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static int __init hvc_tile_console_init(void)
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{
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hvc_instantiate(0, 0, &hvc_tile_get_put_ops);
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add_preferred_console("hvc", 0, NULL);
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return 0;
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}
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console_initcall(hvc_tile_console_init);
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static int __init hvc_tile_init(void)
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{
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#ifndef __tilegx__
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struct hvc_struct *hp;
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hp = hvc_alloc(0, 0, &hvc_tile_get_put_ops, 128);
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return IS_ERR(hp) ? PTR_ERR(hp) : 0;
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#else
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platform_device_register(&hvc_tile_pdev);
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return platform_driver_register(&hvc_tile_driver);
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#endif
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}
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device_initcall(hvc_tile_init);
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