[PATCH] powerpc: hvc_console updates
These are some updates from both Ryan and Arnd for the hvc_console driver: The main point is to enable the inclusion of a console driver for rtas, which is currrently needed for the cell platform. Also shuffle around some data-type declarations and moves some functions out of include/asm-ppc64/hvconsole.h and into a new drivers/char/hvc_console.h file. Signed-off-by: "Ryan S. Arnold" <rsa@us.ibm.com> Signed-off-by: Arnd Bergmann <abergman@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Ryan S. Arnold
Paul Mackerras
parent
11089f08d9
commit
45d607ed92
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@ -62,6 +62,11 @@ int hvc_put_chars(uint32_t vtermno, const char *buf, int count)
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unsigned long *lbuf = (unsigned long *) buf;
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long ret;
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/* hcall will ret H_PARAMETER if 'count' exceeds firmware max.*/
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if (count > MAX_VIO_PUT_CHARS)
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count = MAX_VIO_PUT_CHARS;
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ret = plpar_hcall_norets(H_PUT_TERM_CHAR, vtermno, count, lbuf[0],
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lbuf[1]);
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if (ret == H_Success)
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@ -561,9 +561,19 @@ config TIPAR
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If unsure, say N.
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config HVC_DRIVER
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bool
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help
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Users of pSeries machines that want to utilize the hvc console front-end
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module for their backend console driver should select this option.
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It will automatically be selected if one of the back-end console drivers
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is selected.
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config HVC_CONSOLE
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bool "pSeries Hypervisor Virtual Console support"
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depends on PPC_PSERIES
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select HVC_DRIVER
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help
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pSeries machines when partitioned support a hypervisor virtual
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console. This driver allows each pSeries partition to have a console
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@ -41,7 +41,8 @@ obj-$(CONFIG_N_HDLC) += n_hdlc.o
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obj-$(CONFIG_AMIGA_BUILTIN_SERIAL) += amiserial.o
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obj-$(CONFIG_SX) += sx.o generic_serial.o
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obj-$(CONFIG_RIO) += rio/ generic_serial.o
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obj-$(CONFIG_HVC_CONSOLE) += hvc_console.o hvc_vio.o hvsi.o
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obj-$(CONFIG_HVC_DRIVER) += hvc_console.o
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obj-$(CONFIG_HVC_CONSOLE) += hvc_vio.o hvsi.o
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obj-$(CONFIG_RAW_DRIVER) += raw.o
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obj-$(CONFIG_SGI_SNSC) += snsc.o snsc_event.o
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obj-$(CONFIG_MMTIMER) += mmtimer.o
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@ -39,8 +39,10 @@
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <linux/delay.h>
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#include <asm/uaccess.h>
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#include <asm/hvconsole.h>
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#include "hvc_console.h"
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#define HVC_MAJOR 229
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#define HVC_MINOR 0
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@ -54,17 +56,14 @@
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#define HVC_CLOSE_WAIT (HZ/100) /* 1/10 of a second */
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/*
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* The Linux TTY code does not support dynamic addition of tty derived devices
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* so we need to know how many tty devices we might need when space is allocated
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* for the tty device. Since this driver supports hotplug of vty adapters we
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* need to make sure we have enough allocated.
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* These sizes are most efficient for vio, because they are the
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* native transfer size. We could make them selectable in the
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* future to better deal with backends that want other buffer sizes.
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*/
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#define HVC_ALLOC_TTY_ADAPTERS 8
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#define N_OUTBUF 16
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#define N_INBUF 16
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#define __ALIGNED__ __attribute__((__aligned__(8)))
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#define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
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static struct tty_driver *hvc_driver;
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static struct task_struct *hvc_task;
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@ -154,7 +153,7 @@ static uint32_t vtermnos[MAX_NR_HVC_CONSOLES] =
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void hvc_console_print(struct console *co, const char *b, unsigned count)
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{
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char c[16] __ALIGNED__;
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char c[N_OUTBUF] __ALIGNED__;
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unsigned i = 0, n = 0;
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int r, donecr = 0, index = co->index;
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@ -473,8 +472,10 @@ static void hvc_push(struct hvc_struct *hp)
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n = hp->ops->put_chars(hp->vtermno, hp->outbuf, hp->n_outbuf);
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if (n <= 0) {
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if (n == 0)
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if (n == 0) {
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hp->do_wakeup = 1;
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return;
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}
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/* throw away output on error; this happens when
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there is no session connected to the vterm. */
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hp->n_outbuf = 0;
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@ -486,12 +487,19 @@ static void hvc_push(struct hvc_struct *hp)
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hp->do_wakeup = 1;
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}
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static inline int __hvc_write_kernel(struct hvc_struct *hp,
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const unsigned char *buf, int count)
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static int hvc_write(struct tty_struct *tty, const unsigned char *buf, int count)
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{
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struct hvc_struct *hp = tty->driver_data;
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unsigned long flags;
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int rsize, written = 0;
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/* This write was probably executed during a tty close. */
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if (!hp)
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return -EPIPE;
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if (hp->count <= 0)
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return -EIO;
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spin_lock_irqsave(&hp->lock, flags);
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/* Push pending writes */
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@ -510,26 +518,8 @@ static inline int __hvc_write_kernel(struct hvc_struct *hp,
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}
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spin_unlock_irqrestore(&hp->lock, flags);
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return written;
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}
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static int hvc_write(struct tty_struct *tty, const unsigned char *buf, int count)
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{
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struct hvc_struct *hp = tty->driver_data;
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int written;
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/* This write was probably executed during a tty close. */
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if (!hp)
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return -EPIPE;
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if (hp->count <= 0)
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return -EIO;
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written = __hvc_write_kernel(hp, buf, count);
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/*
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* Racy, but harmless, kick thread if there is still pending data.
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* There really is nothing wrong with kicking the thread, even if there
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* is no buffered data.
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*/
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if (hp->n_outbuf)
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hvc_kick();
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@ -614,6 +604,13 @@ static int hvc_poll(struct hvc_struct *hp)
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spin_unlock_irqrestore(&hp->lock, flags);
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tty_hangup(tty);
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spin_lock_irqsave(&hp->lock, flags);
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} else if ( n == -EAGAIN ) {
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/*
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* Some back-ends can only ensure a certain min
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* num of bytes read, which may be > 'count'.
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* Let the tty clear the flip buff to make room.
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*/
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poll_mask |= HVC_POLL_READ;
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}
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break;
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}
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@ -635,16 +632,7 @@ static int hvc_poll(struct hvc_struct *hp)
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tty_insert_flip_char(tty, buf[i], 0);
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}
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/*
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* Account for the total amount read in one loop, and if above
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* 64 bytes, we do a quick schedule loop to let the tty grok
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* the data and eventually throttle us.
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*/
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read_total += n;
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if (read_total >= 64) {
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poll_mask |= HVC_POLL_QUICK;
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break;
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}
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}
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throttled:
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/* Wakeup write queue if necessary */
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@ -767,7 +755,8 @@ struct hvc_struct __devinit *hvc_alloc(uint32_t vtermno, int irq,
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* see if this vterm id matches one registered for console.
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*/
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for (i=0; i < MAX_NR_HVC_CONSOLES; i++)
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if (vtermnos[i] == hp->vtermno)
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if (vtermnos[i] == hp->vtermno &&
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cons_ops[i] == hp->ops)
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break;
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/* no matching slot, just use a counter */
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@ -0,0 +1,63 @@
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/*
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* hvc_console.h
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* Copyright (C) 2005 IBM Corporation
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*
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* Author(s):
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* Ryan S. Arnold <rsa@us.ibm.com>
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*
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* hvc_console header information:
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* moved here from include/asm-powerpc/hvconsole.h
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* and drivers/char/hvc_console.c
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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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#ifndef HVC_CONSOLE_H
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#define HVC_CONSOLE_H
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/*
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* This is the max number of console adapters that can/will be found as
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* console devices on first stage console init. Any number beyond this range
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* can't be used as a console device but is still a valid tty device.
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*/
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#define MAX_NR_HVC_CONSOLES 16
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/*
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* The Linux TTY code does not support dynamic addition of tty derived devices
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* so we need to know how many tty devices we might need when space is allocated
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* for the tty device. Since this driver supports hotplug of vty adapters we
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* need to make sure we have enough allocated.
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*/
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#define HVC_ALLOC_TTY_ADAPTERS 8
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/* implemented by a low level driver */
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struct hv_ops {
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int (*get_chars)(uint32_t vtermno, char *buf, int count);
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int (*put_chars)(uint32_t vtermno, const char *buf, int count);
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};
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struct hvc_struct;
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/* Register a vterm and a slot index for use as a console (console_init) */
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extern int hvc_instantiate(uint32_t vtermno, int index, struct hv_ops *ops);
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/* register a vterm for hvc tty operation (module_init or hotplug add) */
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extern struct hvc_struct * __devinit hvc_alloc(uint32_t vtermno, int irq,
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struct hv_ops *ops);
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/* remove a vterm from hvc tty operation (modele_exit or hotplug remove) */
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extern int __devexit hvc_remove(struct hvc_struct *hp);
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#endif // HVC_CONSOLE_H
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@ -31,10 +31,13 @@
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#include <linux/types.h>
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#include <linux/init.h>
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#include <asm/hvconsole.h>
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#include <asm/vio.h>
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#include <asm/prom.h>
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#include "hvc_console.h"
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char hvc_driver_name[] = "hvc_console";
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static struct vio_device_id hvc_driver_table[] __devinitdata = {
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@ -48,6 +51,14 @@ static int filtered_get_chars(uint32_t vtermno, char *buf, int count)
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unsigned long got;
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int i;
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/*
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* Vio firmware will read up to SIZE_VIO_GET_CHARS at its own discretion
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* so we play safe and avoid the situation where got > count which could
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* overload the flip buffer.
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*/
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if (count < SIZE_VIO_GET_CHARS)
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return -EAGAIN;
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got = hvc_get_chars(vtermno, buf, count);
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/*
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@ -24,28 +24,18 @@
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#ifdef __KERNEL__
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/*
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* This is the max number of console adapters that can/will be found as
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* console devices on first stage console init. Any number beyond this range
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* can't be used as a console device but is still a valid tty device.
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* PSeries firmware will only send/recv up to 16 bytes of character data per
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* hcall.
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*/
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#define MAX_NR_HVC_CONSOLES 16
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#define MAX_VIO_PUT_CHARS 16
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#define SIZE_VIO_GET_CHARS 16
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/* implemented by a low level driver */
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struct hv_ops {
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int (*get_chars)(uint32_t vtermno, char *buf, int count);
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int (*put_chars)(uint32_t vtermno, const char *buf, int count);
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};
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/*
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* Vio firmware always attempts to fetch MAX_VIO_GET_CHARS chars. The 'count'
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* parm is included to conform to put_chars() function pointer template
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*/
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extern int hvc_get_chars(uint32_t vtermno, char *buf, int count);
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extern int hvc_put_chars(uint32_t vtermno, const char *buf, int count);
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struct hvc_struct;
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/* Register a vterm and a slot index for use as a console (console_init) */
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extern int hvc_instantiate(uint32_t vtermno, int index, struct hv_ops *ops);
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/* register a vterm for hvc tty operation (module_init or hotplug add) */
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extern struct hvc_struct * __devinit hvc_alloc(uint32_t vtermno, int irq,
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struct hv_ops *ops);
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/* remove a vterm from hvc tty operation (modele_exit or hotplug remove) */
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extern int __devexit hvc_remove(struct hvc_struct *hp);
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#endif /* __KERNEL__ */
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#endif /* _PPC64_HVCONSOLE_H */
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