tty: move hvc drivers to drivers/tty/hvc/
As requested by Arnd Bergmann, the hvc drivers are now moved to the drivers/tty/hvc/ directory. The virtio_console.c driver was also moved, as it required the hvc_console.h file to be able to be built, and it really is a hvc driver. Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman
271
drivers/tty/hvc/hvc_xen.c
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271
drivers/tty/hvc/hvc_xen.c
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/*
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* xen console driver interface to hvc_console.c
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*
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* (c) 2007 Gerd Hoffmann <kraxel@suse.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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/types.h>
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#include <asm/xen/hypervisor.h>
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#include <xen/xen.h>
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#include <xen/page.h>
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#include <xen/events.h>
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#include <xen/interface/io/console.h>
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#include <xen/hvc-console.h>
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#include "hvc_console.h"
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#define HVC_COOKIE 0x58656e /* "Xen" in hex */
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static struct hvc_struct *hvc;
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static int xencons_irq;
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/* ------------------------------------------------------------------ */
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static unsigned long console_pfn = ~0ul;
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static inline struct xencons_interface *xencons_interface(void)
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{
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if (console_pfn == ~0ul)
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return mfn_to_virt(xen_start_info->console.domU.mfn);
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else
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return __va(console_pfn << PAGE_SHIFT);
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}
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static inline void notify_daemon(void)
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{
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/* Use evtchn: this is called early, before irq is set up. */
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notify_remote_via_evtchn(xen_start_info->console.domU.evtchn);
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}
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static int __write_console(const char *data, int len)
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{
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struct xencons_interface *intf = xencons_interface();
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XENCONS_RING_IDX cons, prod;
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int sent = 0;
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cons = intf->out_cons;
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prod = intf->out_prod;
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mb(); /* update queue values before going on */
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BUG_ON((prod - cons) > sizeof(intf->out));
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while ((sent < len) && ((prod - cons) < sizeof(intf->out)))
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intf->out[MASK_XENCONS_IDX(prod++, intf->out)] = data[sent++];
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wmb(); /* write ring before updating pointer */
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intf->out_prod = prod;
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if (sent)
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notify_daemon();
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return sent;
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}
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static int domU_write_console(uint32_t vtermno, const char *data, int len)
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{
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int ret = len;
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/*
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* Make sure the whole buffer is emitted, polling if
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* necessary. We don't ever want to rely on the hvc daemon
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* because the most interesting console output is when the
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* kernel is crippled.
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*/
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while (len) {
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int sent = __write_console(data, len);
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data += sent;
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len -= sent;
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if (unlikely(len))
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HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
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}
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return ret;
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}
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static int domU_read_console(uint32_t vtermno, char *buf, int len)
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{
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struct xencons_interface *intf = xencons_interface();
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XENCONS_RING_IDX cons, prod;
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int recv = 0;
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cons = intf->in_cons;
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prod = intf->in_prod;
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mb(); /* get pointers before reading ring */
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BUG_ON((prod - cons) > sizeof(intf->in));
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while (cons != prod && recv < len)
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buf[recv++] = intf->in[MASK_XENCONS_IDX(cons++, intf->in)];
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mb(); /* read ring before consuming */
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intf->in_cons = cons;
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notify_daemon();
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return recv;
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}
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static struct hv_ops domU_hvc_ops = {
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.get_chars = domU_read_console,
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.put_chars = domU_write_console,
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.notifier_add = notifier_add_irq,
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.notifier_del = notifier_del_irq,
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.notifier_hangup = notifier_hangup_irq,
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};
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static int dom0_read_console(uint32_t vtermno, char *buf, int len)
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{
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return HYPERVISOR_console_io(CONSOLEIO_read, len, buf);
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}
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/*
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* Either for a dom0 to write to the system console, or a domU with a
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* debug version of Xen
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*/
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static int dom0_write_console(uint32_t vtermno, const char *str, int len)
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{
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int rc = HYPERVISOR_console_io(CONSOLEIO_write, len, (char *)str);
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if (rc < 0)
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return 0;
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return len;
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}
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static struct hv_ops dom0_hvc_ops = {
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.get_chars = dom0_read_console,
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.put_chars = dom0_write_console,
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.notifier_add = notifier_add_irq,
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.notifier_del = notifier_del_irq,
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.notifier_hangup = notifier_hangup_irq,
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};
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static int __init xen_hvc_init(void)
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{
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struct hvc_struct *hp;
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struct hv_ops *ops;
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if (!xen_pv_domain())
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return -ENODEV;
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if (xen_initial_domain()) {
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ops = &dom0_hvc_ops;
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xencons_irq = bind_virq_to_irq(VIRQ_CONSOLE, 0);
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} else {
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if (!xen_start_info->console.domU.evtchn)
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return -ENODEV;
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ops = &domU_hvc_ops;
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xencons_irq = bind_evtchn_to_irq(xen_start_info->console.domU.evtchn);
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}
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if (xencons_irq < 0)
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xencons_irq = 0; /* NO_IRQ */
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hp = hvc_alloc(HVC_COOKIE, xencons_irq, ops, 256);
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if (IS_ERR(hp))
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return PTR_ERR(hp);
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hvc = hp;
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console_pfn = mfn_to_pfn(xen_start_info->console.domU.mfn);
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return 0;
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}
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void xen_console_resume(void)
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{
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if (xencons_irq)
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rebind_evtchn_irq(xen_start_info->console.domU.evtchn, xencons_irq);
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}
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static void __exit xen_hvc_fini(void)
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{
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if (hvc)
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hvc_remove(hvc);
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}
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static int xen_cons_init(void)
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{
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struct hv_ops *ops;
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if (!xen_pv_domain())
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return 0;
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if (xen_initial_domain())
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ops = &dom0_hvc_ops;
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else
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ops = &domU_hvc_ops;
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hvc_instantiate(HVC_COOKIE, 0, ops);
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return 0;
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}
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module_init(xen_hvc_init);
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module_exit(xen_hvc_fini);
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console_initcall(xen_cons_init);
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#ifdef CONFIG_EARLY_PRINTK
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static void xenboot_write_console(struct console *console, const char *string,
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unsigned len)
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{
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unsigned int linelen, off = 0;
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const char *pos;
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dom0_write_console(0, string, len);
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if (xen_initial_domain())
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return;
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domU_write_console(0, "(early) ", 8);
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while (off < len && NULL != (pos = strchr(string+off, '\n'))) {
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linelen = pos-string+off;
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if (off + linelen > len)
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break;
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domU_write_console(0, string+off, linelen);
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domU_write_console(0, "\r\n", 2);
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off += linelen + 1;
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}
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if (off < len)
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domU_write_console(0, string+off, len-off);
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}
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struct console xenboot_console = {
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.name = "xenboot",
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.write = xenboot_write_console,
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.flags = CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME,
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};
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#endif /* CONFIG_EARLY_PRINTK */
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void xen_raw_console_write(const char *str)
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{
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dom0_write_console(0, str, strlen(str));
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}
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void xen_raw_printk(const char *fmt, ...)
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{
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static char buf[512];
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va_list ap;
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va_start(ap, fmt);
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vsnprintf(buf, sizeof(buf), fmt, ap);
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va_end(ap);
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xen_raw_console_write(buf);
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}
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