+++ /dev/null
-/*
- * iSeries vio driver interface to hvc_console.c
- *
- * This code is based heavily on hvc_vio.c and viocons.c
- *
- * Copyright (C) 2006 Stephen Rothwell, IBM Corporation
- *
- * 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; either version 2 of the License, or
- * (at your option) any later version.
- *
- * 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. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-#include <stdarg.h>
-#include <linux/types.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/spinlock.h>
-#include <linux/console.h>
-
-#include <asm/hvconsole.h>
-#include <asm/vio.h>
-#include <asm/prom.h>
-#include <asm/firmware.h>
-#include <asm/iseries/vio.h>
-#include <asm/iseries/hv_call.h>
-#include <asm/iseries/hv_lp_config.h>
-#include <asm/iseries/hv_lp_event.h>
-
-#include "hvc_console.h"
-
-#define VTTY_PORTS 10
-
-static DEFINE_SPINLOCK(consolelock);
-static DEFINE_SPINLOCK(consoleloglock);
-
-static const char hvc_driver_name[] = "hvc_console";
-
-#define IN_BUF_SIZE 200
-
-/*
- * Our port information.
- */
-static struct port_info {
- HvLpIndex lp;
- u64 seq; /* sequence number of last HV send */
- u64 ack; /* last ack from HV */
- struct hvc_struct *hp;
- int in_start;
- int in_end;
- unsigned char in_buf[IN_BUF_SIZE];
-} port_info[VTTY_PORTS] = {
- [ 0 ... VTTY_PORTS - 1 ] = {
- .lp = HvLpIndexInvalid
- }
-};
-
-#define viochar_is_console(pi) ((pi) == &port_info[0])
-
-static struct vio_device_id hvc_driver_table[] __devinitdata = {
- {"serial", "IBM,iSeries-vty"},
- { "", "" }
-};
-MODULE_DEVICE_TABLE(vio, hvc_driver_table);
-
-static void hvlog(char *fmt, ...)
-{
- int i;
- unsigned long flags;
- va_list args;
- static char buf[256];
-
- spin_lock_irqsave(&consoleloglock, flags);
- va_start(args, fmt);
- i = vscnprintf(buf, sizeof(buf) - 1, fmt, args);
- va_end(args);
- buf[i++] = '\r';
- HvCall_writeLogBuffer(buf, i);
- spin_unlock_irqrestore(&consoleloglock, flags);
-}
-
-/*
- * Initialize the common fields in a charLpEvent
- */
-static void init_data_event(struct viocharlpevent *viochar, HvLpIndex lp)
-{
- struct HvLpEvent *hev = &viochar->event;
-
- memset(viochar, 0, sizeof(struct viocharlpevent));
-
- hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DEFERRED_ACK |
- HV_LP_EVENT_INT;
- hev->xType = HvLpEvent_Type_VirtualIo;
- hev->xSubtype = viomajorsubtype_chario | viochardata;
- hev->xSourceLp = HvLpConfig_getLpIndex();
- hev->xTargetLp = lp;
- hev->xSizeMinus1 = sizeof(struct viocharlpevent);
- hev->xSourceInstanceId = viopath_sourceinst(lp);
- hev->xTargetInstanceId = viopath_targetinst(lp);
-}
-
-static int get_chars(uint32_t vtermno, char *buf, int count)
-{
- struct port_info *pi;
- int n = 0;
- unsigned long flags;
-
- if (vtermno >= VTTY_PORTS)
- return -EINVAL;
- if (count == 0)
- return 0;
-
- pi = &port_info[vtermno];
- spin_lock_irqsave(&consolelock, flags);
-
- if (pi->in_end == 0)
- goto done;
-
- n = pi->in_end - pi->in_start;
- if (n > count)
- n = count;
- memcpy(buf, &pi->in_buf[pi->in_start], n);
- pi->in_start += n;
- if (pi->in_start == pi->in_end) {
- pi->in_start = 0;
- pi->in_end = 0;
- }
-done:
- spin_unlock_irqrestore(&consolelock, flags);
- return n;
-}
-
-static int put_chars(uint32_t vtermno, const char *buf, int count)
-{
- struct viocharlpevent *viochar;
- struct port_info *pi;
- HvLpEvent_Rc hvrc;
- unsigned long flags;
- int sent = 0;
-
- if (vtermno >= VTTY_PORTS)
- return -EINVAL;
-
- pi = &port_info[vtermno];
-
- spin_lock_irqsave(&consolelock, flags);
-
- if (viochar_is_console(pi) && !viopath_isactive(pi->lp)) {
- HvCall_writeLogBuffer(buf, count);
- sent = count;
- goto done;
- }
-
- viochar = vio_get_event_buffer(viomajorsubtype_chario);
- if (viochar == NULL) {
- hvlog("\n\rviocons: Can't get viochar buffer.");
- goto done;
- }
-
- while ((count > 0) && ((pi->seq - pi->ack) < VIOCHAR_WINDOW)) {
- int len;
-
- len = (count > VIOCHAR_MAX_DATA) ? VIOCHAR_MAX_DATA : count;
-
- if (viochar_is_console(pi))
- HvCall_writeLogBuffer(buf, len);
-
- init_data_event(viochar, pi->lp);
-
- viochar->len = len;
- viochar->event.xCorrelationToken = pi->seq++;
- viochar->event.xSizeMinus1 =
- offsetof(struct viocharlpevent, data) + len;
-
- memcpy(viochar->data, buf, len);
-
- hvrc = HvCallEvent_signalLpEvent(&viochar->event);
- if (hvrc)
- hvlog("\n\rerror sending event! return code %d\n\r",
- (int)hvrc);
- sent += len;
- count -= len;
- buf += len;
- }
-
- vio_free_event_buffer(viomajorsubtype_chario, viochar);
-done:
- spin_unlock_irqrestore(&consolelock, flags);
- return sent;
-}
-
-static const struct hv_ops hvc_get_put_ops = {
- .get_chars = get_chars,
- .put_chars = put_chars,
- .notifier_add = notifier_add_irq,
- .notifier_del = notifier_del_irq,
- .notifier_hangup = notifier_hangup_irq,
-};
-
-static int __devinit hvc_vio_probe(struct vio_dev *vdev,
- const struct vio_device_id *id)
-{
- struct hvc_struct *hp;
- struct port_info *pi;
-
- /* probed with invalid parameters. */
- if (!vdev || !id)
- return -EPERM;
-
- if (vdev->unit_address >= VTTY_PORTS)
- return -ENODEV;
-
- pi = &port_info[vdev->unit_address];
-
- hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops,
- VIOCHAR_MAX_DATA);
- if (IS_ERR(hp))
- return PTR_ERR(hp);
- pi->hp = hp;
- dev_set_drvdata(&vdev->dev, pi);
-
- return 0;
-}
-
-static int __devexit hvc_vio_remove(struct vio_dev *vdev)
-{
- struct port_info *pi = dev_get_drvdata(&vdev->dev);
- struct hvc_struct *hp = pi->hp;
-
- return hvc_remove(hp);
-}
-
-static struct vio_driver hvc_vio_driver = {
- .id_table = hvc_driver_table,
- .probe = hvc_vio_probe,
- .remove = __devexit_p(hvc_vio_remove),
- .driver = {
- .name = hvc_driver_name,
- .owner = THIS_MODULE,
- }
-};
-
-static void hvc_open_event(struct HvLpEvent *event)
-{
- unsigned long flags;
- struct viocharlpevent *cevent = (struct viocharlpevent *)event;
- u8 port = cevent->virtual_device;
- struct port_info *pi;
- int reject = 0;
-
- if (hvlpevent_is_ack(event)) {
- if (port >= VTTY_PORTS)
- return;
-
- spin_lock_irqsave(&consolelock, flags);
-
- pi = &port_info[port];
- if (event->xRc == HvLpEvent_Rc_Good) {
- pi->seq = pi->ack = 0;
- /*
- * This line allows connections from the primary
- * partition but once one is connected from the
- * primary partition nothing short of a reboot
- * of linux will allow access from the hosting
- * partition again without a required iSeries fix.
- */
- pi->lp = event->xTargetLp;
- }
-
- spin_unlock_irqrestore(&consolelock, flags);
- if (event->xRc != HvLpEvent_Rc_Good)
- printk(KERN_WARNING
- "hvc: handle_open_event: event->xRc == (%d).\n",
- event->xRc);
-
- if (event->xCorrelationToken != 0) {
- atomic_t *aptr= (atomic_t *)event->xCorrelationToken;
- atomic_set(aptr, 1);
- } else
- printk(KERN_WARNING
- "hvc: weird...got open ack without atomic\n");
- return;
- }
-
- /* This had better require an ack, otherwise complain */
- if (!hvlpevent_need_ack(event)) {
- printk(KERN_WARNING "hvc: viocharopen without ack bit!\n");
- return;
- }
-
- spin_lock_irqsave(&consolelock, flags);
-
- /* Make sure this is a good virtual tty */
- if (port >= VTTY_PORTS) {
- event->xRc = HvLpEvent_Rc_SubtypeError;
- cevent->subtype_result_code = viorc_openRejected;
- /*
- * Flag state here since we can't printk while holding
- * the consolelock spinlock.
- */
- reject = 1;
- } else {
- pi = &port_info[port];
- if ((pi->lp != HvLpIndexInvalid) &&
- (pi->lp != event->xSourceLp)) {
- /*
- * If this is tty is already connected to a different
- * partition, fail.
- */
- event->xRc = HvLpEvent_Rc_SubtypeError;
- cevent->subtype_result_code = viorc_openRejected;
- reject = 2;
- } else {
- pi->lp = event->xSourceLp;
- event->xRc = HvLpEvent_Rc_Good;
- cevent->subtype_result_code = viorc_good;
- pi->seq = pi->ack = 0;
- }
- }
-
- spin_unlock_irqrestore(&consolelock, flags);
-
- if (reject == 1)
- printk(KERN_WARNING "hvc: open rejected: bad virtual tty.\n");
- else if (reject == 2)
- printk(KERN_WARNING "hvc: open rejected: console in exclusive "
- "use by another partition.\n");
-
- /* Return the acknowledgement */
- HvCallEvent_ackLpEvent(event);
-}
-
-/*
- * Handle a close charLpEvent. This should ONLY be an Interrupt because the
- * virtual console should never actually issue a close event to the hypervisor
- * because the virtual console never goes away. A close event coming from the
- * hypervisor simply means that there are no client consoles connected to the
- * virtual console.
- */
-static void hvc_close_event(struct HvLpEvent *event)
-{
- unsigned long flags;
- struct viocharlpevent *cevent = (struct viocharlpevent *)event;
- u8 port = cevent->virtual_device;
-
- if (!hvlpevent_is_int(event)) {
- printk(KERN_WARNING
- "hvc: got unexpected close acknowledgement\n");
- return;
- }
-
- if (port >= VTTY_PORTS) {
- printk(KERN_WARNING
- "hvc: close message from invalid virtual device.\n");
- return;
- }
-
- /* For closes, just mark the console partition invalid */
- spin_lock_irqsave(&consolelock, flags);
-
- if (port_info[port].lp == event->xSourceLp)
- port_info[port].lp = HvLpIndexInvalid;
-
- spin_unlock_irqrestore(&consolelock, flags);
-}
-
-static void hvc_data_event(struct HvLpEvent *event)
-{
- unsigned long flags;
- struct viocharlpevent *cevent = (struct viocharlpevent *)event;
- struct port_info *pi;
- int n;
- u8 port = cevent->virtual_device;
-
- if (port >= VTTY_PORTS) {
- printk(KERN_WARNING "hvc: data on invalid virtual device %d\n",
- port);
- return;
- }
- if (cevent->len == 0)
- return;
-
- /*
- * Change 05/01/2003 - Ryan Arnold: If a partition other than
- * the current exclusive partition tries to send us data
- * events then just drop them on the floor because we don't
- * want his stinking data. He isn't authorized to receive
- * data because he wasn't the first one to get the console,
- * therefore he shouldn't be allowed to send data either.
- * This will work without an iSeries fix.
- */
- pi = &port_info[port];
- if (pi->lp != event->xSourceLp)
- return;
-
- spin_lock_irqsave(&consolelock, flags);
-
- n = IN_BUF_SIZE - pi->in_end;
- if (n > cevent->len)
- n = cevent->len;
- if (n > 0) {
- memcpy(&pi->in_buf[pi->in_end], cevent->data, n);
- pi->in_end += n;
- }
- spin_unlock_irqrestore(&consolelock, flags);
- if (n == 0)
- printk(KERN_WARNING "hvc: input buffer overflow\n");
-}
-
-static void hvc_ack_event(struct HvLpEvent *event)
-{
- struct viocharlpevent *cevent = (struct viocharlpevent *)event;
- unsigned long flags;
- u8 port = cevent->virtual_device;
-
- if (port >= VTTY_PORTS) {
- printk(KERN_WARNING "hvc: data on invalid virtual device\n");
- return;
- }
-
- spin_lock_irqsave(&consolelock, flags);
- port_info[port].ack = event->xCorrelationToken;
- spin_unlock_irqrestore(&consolelock, flags);
-}
-
-static void hvc_config_event(struct HvLpEvent *event)
-{
- struct viocharlpevent *cevent = (struct viocharlpevent *)event;
-
- if (cevent->data[0] == 0x01)
- printk(KERN_INFO "hvc: window resized to %d: %d: %d: %d\n",
- cevent->data[1], cevent->data[2],
- cevent->data[3], cevent->data[4]);
- else
- printk(KERN_WARNING "hvc: unknown config event\n");
-}
-
-static void hvc_handle_event(struct HvLpEvent *event)
-{
- int charminor;
-
- if (event == NULL)
- return;
-
- charminor = event->xSubtype & VIOMINOR_SUBTYPE_MASK;
- switch (charminor) {
- case viocharopen:
- hvc_open_event(event);
- break;
- case viocharclose:
- hvc_close_event(event);
- break;
- case viochardata:
- hvc_data_event(event);
- break;
- case viocharack:
- hvc_ack_event(event);
- break;
- case viocharconfig:
- hvc_config_event(event);
- break;
- default:
- if (hvlpevent_is_int(event) && hvlpevent_need_ack(event)) {
- event->xRc = HvLpEvent_Rc_InvalidSubtype;
- HvCallEvent_ackLpEvent(event);
- }
- }
-}
-
-static int __init send_open(HvLpIndex remoteLp, void *sem)
-{
- return HvCallEvent_signalLpEventFast(remoteLp,
- HvLpEvent_Type_VirtualIo,
- viomajorsubtype_chario | viocharopen,
- HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
- viopath_sourceinst(remoteLp),
- viopath_targetinst(remoteLp),
- (u64)(unsigned long)sem, VIOVERSION << 16,
- 0, 0, 0, 0);
-}
-
-static int __init hvc_vio_init(void)
-{
- atomic_t wait_flag;
- int rc;
-
- if (!firmware_has_feature(FW_FEATURE_ISERIES))
- return -EIO;
-
- /* +2 for fudge */
- rc = viopath_open(HvLpConfig_getPrimaryLpIndex(),
- viomajorsubtype_chario, VIOCHAR_WINDOW + 2);
- if (rc)
- printk(KERN_WARNING "hvc: error opening to primary %d\n", rc);
-
- if (viopath_hostLp == HvLpIndexInvalid)
- vio_set_hostlp();
-
- /*
- * And if the primary is not the same as the hosting LP, open to the
- * hosting lp
- */
- if ((viopath_hostLp != HvLpIndexInvalid) &&
- (viopath_hostLp != HvLpConfig_getPrimaryLpIndex())) {
- printk(KERN_INFO "hvc: open path to hosting (%d)\n",
- viopath_hostLp);
- rc = viopath_open(viopath_hostLp, viomajorsubtype_chario,
- VIOCHAR_WINDOW + 2); /* +2 for fudge */
- if (rc)
- printk(KERN_WARNING
- "error opening to partition %d: %d\n",
- viopath_hostLp, rc);
- }
-
- if (vio_setHandler(viomajorsubtype_chario, hvc_handle_event) < 0)
- printk(KERN_WARNING
- "hvc: error seting handler for console events!\n");
-
- /*
- * First, try to open the console to the hosting lp.
- * Wait on a semaphore for the response.
- */
- atomic_set(&wait_flag, 0);
- if ((viopath_isactive(viopath_hostLp)) &&
- (send_open(viopath_hostLp, &wait_flag) == 0)) {
- printk(KERN_INFO "hvc: hosting partition %d\n", viopath_hostLp);
- while (atomic_read(&wait_flag) == 0)
- mb();
- atomic_set(&wait_flag, 0);
- }
-
- /*
- * If we don't have an active console, try the primary
- */
- if ((!viopath_isactive(port_info[0].lp)) &&
- (viopath_isactive(HvLpConfig_getPrimaryLpIndex())) &&
- (send_open(HvLpConfig_getPrimaryLpIndex(), &wait_flag) == 0)) {
- printk(KERN_INFO "hvc: opening console to primary partition\n");
- while (atomic_read(&wait_flag) == 0)
- mb();
- }
-
- /* Register as a vio device to receive callbacks */
- rc = vio_register_driver(&hvc_vio_driver);
-
- return rc;
-}
-module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */
-
-static void __exit hvc_vio_exit(void)
-{
- vio_unregister_driver(&hvc_vio_driver);
-}
-module_exit(hvc_vio_exit);
-
-/* the device tree order defines our numbering */
-static int __init hvc_find_vtys(void)
-{
- struct device_node *vty;
- int num_found = 0;
-
- for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL;
- vty = of_find_node_by_name(vty, "vty")) {
- const uint32_t *vtermno;
-
- /* We have statically defined space for only a certain number
- * of console adapters.
- */
- if ((num_found >= MAX_NR_HVC_CONSOLES) ||
- (num_found >= VTTY_PORTS)) {
- of_node_put(vty);
- break;
- }
-
- vtermno = of_get_property(vty, "reg", NULL);
- if (!vtermno)
- continue;
-
- if (!of_device_is_compatible(vty, "IBM,iSeries-vty"))
- continue;
-
- if (num_found == 0)
- add_preferred_console("hvc", 0, NULL);
- hvc_instantiate(*vtermno, num_found, &hvc_get_put_ops);
- ++num_found;
- }
-
- return num_found;
-}
-console_initcall(hvc_find_vtys);
projects / GitHub / LineageOS / android_kernel_samsung_universal7580.git / commitdiff