| /* -*- linux-c -*- |
| * |
| * iSeries Virtual I/O Message Path code |
| * |
| * Authors: Dave Boutcher <boutcher@us.ibm.com> |
| * Ryan Arnold <ryanarn@us.ibm.com> |
| * Colin Devilbiss <devilbis@us.ibm.com> |
| * |
| * (C) Copyright 2000-2005 IBM Corporation |
| * |
| * This code is used by the iSeries virtual disk, cd, |
| * tape, and console to communicate with OS/400 in another |
| * partition. |
| * |
| * 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) anyu 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 <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/vmalloc.h> |
| #include <linux/string.h> |
| #include <linux/proc_fs.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/wait.h> |
| #include <linux/seq_file.h> |
| #include <linux/smp_lock.h> |
| #include <linux/interrupt.h> |
| |
| #include <asm/system.h> |
| #include <asm/uaccess.h> |
| #include <asm/prom.h> |
| #include <asm/iseries/hv_types.h> |
| #include <asm/iseries/hv_lp_event.h> |
| #include <asm/iseries/hv_lp_config.h> |
| #include <asm/iseries/mf.h> |
| #include <asm/iseries/vio.h> |
| |
| /* Status of the path to each other partition in the system. |
| * This is overkill, since we will only ever establish connections |
| * to our hosting partition and the primary partition on the system. |
| * But this allows for other support in the future. |
| */ |
| static struct viopathStatus { |
| int isOpen; /* Did we open the path? */ |
| int isActive; /* Do we have a mon msg outstanding */ |
| int users[VIO_MAX_SUBTYPES]; |
| HvLpInstanceId mSourceInst; |
| HvLpInstanceId mTargetInst; |
| int numberAllocated; |
| } viopathStatus[HVMAXARCHITECTEDLPS]; |
| |
| static DEFINE_SPINLOCK(statuslock); |
| |
| /* |
| * For each kind of event we allocate a buffer that is |
| * guaranteed not to cross a page boundary |
| */ |
| static unsigned char event_buffer[VIO_MAX_SUBTYPES * 256] |
| __attribute__((__aligned__(4096))); |
| static atomic_t event_buffer_available[VIO_MAX_SUBTYPES]; |
| static int event_buffer_initialised; |
| |
| static void handleMonitorEvent(struct HvLpEvent *event); |
| |
| /* |
| * We use this structure to handle asynchronous responses. The caller |
| * blocks on the semaphore and the handler posts the semaphore. However, |
| * if system_state is not SYSTEM_RUNNING, then wait_atomic is used ... |
| */ |
| struct alloc_parms { |
| struct semaphore sem; |
| int number; |
| atomic_t wait_atomic; |
| int used_wait_atomic; |
| }; |
| |
| /* Put a sequence number in each mon msg. The value is not |
| * important. Start at something other than 0 just for |
| * readability. wrapping this is ok. |
| */ |
| static u8 viomonseq = 22; |
| |
| /* Our hosting logical partition. We get this at startup |
| * time, and different modules access this variable directly. |
| */ |
| HvLpIndex viopath_hostLp = HvLpIndexInvalid; |
| EXPORT_SYMBOL(viopath_hostLp); |
| HvLpIndex viopath_ourLp = HvLpIndexInvalid; |
| EXPORT_SYMBOL(viopath_ourLp); |
| |
| /* For each kind of incoming event we set a pointer to a |
| * routine to call. |
| */ |
| static vio_event_handler_t *vio_handler[VIO_MAX_SUBTYPES]; |
| |
| #define VIOPATH_KERN_WARN KERN_WARNING "viopath: " |
| #define VIOPATH_KERN_INFO KERN_INFO "viopath: " |
| |
| static int proc_viopath_show(struct seq_file *m, void *v) |
| { |
| char *buf; |
| u16 vlanMap; |
| dma_addr_t handle; |
| HvLpEvent_Rc hvrc; |
| DECLARE_MUTEX_LOCKED(Semaphore); |
| struct device_node *node; |
| const char *sysid; |
| |
| buf = kzalloc(HW_PAGE_SIZE, GFP_KERNEL); |
| if (!buf) |
| return 0; |
| |
| handle = dma_map_single(iSeries_vio_dev, buf, HW_PAGE_SIZE, |
| DMA_FROM_DEVICE); |
| |
| hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, |
| HvLpEvent_Type_VirtualIo, |
| viomajorsubtype_config | vioconfigget, |
| HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck, |
| viopath_sourceinst(viopath_hostLp), |
| viopath_targetinst(viopath_hostLp), |
| (u64)(unsigned long)&Semaphore, VIOVERSION << 16, |
| ((u64)handle) << 32, HW_PAGE_SIZE, 0, 0); |
| |
| if (hvrc != HvLpEvent_Rc_Good) |
| printk(VIOPATH_KERN_WARN "hv error on op %d\n", (int)hvrc); |
| |
| down(&Semaphore); |
| |
| vlanMap = HvLpConfig_getVirtualLanIndexMap(); |
| |
| buf[HW_PAGE_SIZE-1] = '\0'; |
| seq_printf(m, "%s", buf); |
| |
| dma_unmap_single(iSeries_vio_dev, handle, HW_PAGE_SIZE, |
| DMA_FROM_DEVICE); |
| kfree(buf); |
| |
| seq_printf(m, "AVAILABLE_VETH=%x\n", vlanMap); |
| |
| node = of_find_node_by_path("/"); |
| sysid = NULL; |
| if (node != NULL) |
| sysid = get_property(node, "system-id", NULL); |
| |
| if (sysid == NULL) |
| seq_printf(m, "SRLNBR=<UNKNOWN>\n"); |
| else |
| /* Skip "IBM," on front of serial number, see dt.c */ |
| seq_printf(m, "SRLNBR=%s\n", sysid + 4); |
| |
| of_node_put(node); |
| |
| return 0; |
| } |
| |
| static int proc_viopath_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, proc_viopath_show, NULL); |
| } |
| |
| static struct file_operations proc_viopath_operations = { |
| .open = proc_viopath_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| static int __init vio_proc_init(void) |
| { |
| struct proc_dir_entry *e; |
| |
| e = create_proc_entry("iSeries/config", 0, NULL); |
| if (e) |
| e->proc_fops = &proc_viopath_operations; |
| |
| return 0; |
| } |
| __initcall(vio_proc_init); |
| |
| /* See if a given LP is active. Allow for invalid lps to be passed in |
| * and just return invalid |
| */ |
| int viopath_isactive(HvLpIndex lp) |
| { |
| if (lp == HvLpIndexInvalid) |
| return 0; |
| if (lp < HVMAXARCHITECTEDLPS) |
| return viopathStatus[lp].isActive; |
| else |
| return 0; |
| } |
| EXPORT_SYMBOL(viopath_isactive); |
| |
| /* |
| * We cache the source and target instance ids for each |
| * partition. |
| */ |
| HvLpInstanceId viopath_sourceinst(HvLpIndex lp) |
| { |
| return viopathStatus[lp].mSourceInst; |
| } |
| EXPORT_SYMBOL(viopath_sourceinst); |
| |
| HvLpInstanceId viopath_targetinst(HvLpIndex lp) |
| { |
| return viopathStatus[lp].mTargetInst; |
| } |
| EXPORT_SYMBOL(viopath_targetinst); |
| |
| /* |
| * Send a monitor message. This is a message with the acknowledge |
| * bit on that the other side will NOT explicitly acknowledge. When |
| * the other side goes down, the hypervisor will acknowledge any |
| * outstanding messages....so we will know when the other side dies. |
| */ |
| static void sendMonMsg(HvLpIndex remoteLp) |
| { |
| HvLpEvent_Rc hvrc; |
| |
| viopathStatus[remoteLp].mSourceInst = |
| HvCallEvent_getSourceLpInstanceId(remoteLp, |
| HvLpEvent_Type_VirtualIo); |
| viopathStatus[remoteLp].mTargetInst = |
| HvCallEvent_getTargetLpInstanceId(remoteLp, |
| HvLpEvent_Type_VirtualIo); |
| |
| /* |
| * Deliberately ignore the return code here. if we call this |
| * more than once, we don't care. |
| */ |
| vio_setHandler(viomajorsubtype_monitor, handleMonitorEvent); |
| |
| hvrc = HvCallEvent_signalLpEventFast(remoteLp, HvLpEvent_Type_VirtualIo, |
| viomajorsubtype_monitor, HvLpEvent_AckInd_DoAck, |
| HvLpEvent_AckType_DeferredAck, |
| viopathStatus[remoteLp].mSourceInst, |
| viopathStatus[remoteLp].mTargetInst, |
| viomonseq++, 0, 0, 0, 0, 0); |
| |
| if (hvrc == HvLpEvent_Rc_Good) |
| viopathStatus[remoteLp].isActive = 1; |
| else { |
| printk(VIOPATH_KERN_WARN "could not connect to partition %d\n", |
| remoteLp); |
| viopathStatus[remoteLp].isActive = 0; |
| } |
| } |
| |
| static void handleMonitorEvent(struct HvLpEvent *event) |
| { |
| HvLpIndex remoteLp; |
| int i; |
| |
| /* |
| * This handler is _also_ called as part of the loop |
| * at the end of this routine, so it must be able to |
| * ignore NULL events... |
| */ |
| if (!event) |
| return; |
| |
| /* |
| * First see if this is just a normal monitor message from the |
| * other partition |
| */ |
| if (hvlpevent_is_int(event)) { |
| remoteLp = event->xSourceLp; |
| if (!viopathStatus[remoteLp].isActive) |
| sendMonMsg(remoteLp); |
| return; |
| } |
| |
| /* |
| * This path is for an acknowledgement; the other partition |
| * died |
| */ |
| remoteLp = event->xTargetLp; |
| if ((event->xSourceInstanceId != viopathStatus[remoteLp].mSourceInst) || |
| (event->xTargetInstanceId != viopathStatus[remoteLp].mTargetInst)) { |
| printk(VIOPATH_KERN_WARN "ignoring ack....mismatched instances\n"); |
| return; |
| } |
| |
| printk(VIOPATH_KERN_WARN "partition %d ended\n", remoteLp); |
| |
| viopathStatus[remoteLp].isActive = 0; |
| |
| /* |
| * For each active handler, pass them a NULL |
| * message to indicate that the other partition |
| * died |
| */ |
| for (i = 0; i < VIO_MAX_SUBTYPES; i++) { |
| if (vio_handler[i] != NULL) |
| (*vio_handler[i])(NULL); |
| } |
| } |
| |
| int vio_setHandler(int subtype, vio_event_handler_t *beh) |
| { |
| subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; |
| if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) |
| return -EINVAL; |
| if (vio_handler[subtype] != NULL) |
| return -EBUSY; |
| vio_handler[subtype] = beh; |
| return 0; |
| } |
| EXPORT_SYMBOL(vio_setHandler); |
| |
| int vio_clearHandler(int subtype) |
| { |
| subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; |
| if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) |
| return -EINVAL; |
| if (vio_handler[subtype] == NULL) |
| return -EAGAIN; |
| vio_handler[subtype] = NULL; |
| return 0; |
| } |
| EXPORT_SYMBOL(vio_clearHandler); |
| |
| static void handleConfig(struct HvLpEvent *event) |
| { |
| if (!event) |
| return; |
| if (hvlpevent_is_int(event)) { |
| printk(VIOPATH_KERN_WARN |
| "unexpected config request from partition %d", |
| event->xSourceLp); |
| |
| if (hvlpevent_need_ack(event)) { |
| event->xRc = HvLpEvent_Rc_InvalidSubtype; |
| HvCallEvent_ackLpEvent(event); |
| } |
| return; |
| } |
| |
| up((struct semaphore *)event->xCorrelationToken); |
| } |
| |
| /* |
| * Initialization of the hosting partition |
| */ |
| void vio_set_hostlp(void) |
| { |
| /* |
| * If this has already been set then we DON'T want to either change |
| * it or re-register the proc file system |
| */ |
| if (viopath_hostLp != HvLpIndexInvalid) |
| return; |
| |
| /* |
| * Figure out our hosting partition. This isn't allowed to change |
| * while we're active |
| */ |
| viopath_ourLp = HvLpConfig_getLpIndex(); |
| viopath_hostLp = HvLpConfig_getHostingLpIndex(viopath_ourLp); |
| |
| if (viopath_hostLp != HvLpIndexInvalid) |
| vio_setHandler(viomajorsubtype_config, handleConfig); |
| } |
| EXPORT_SYMBOL(vio_set_hostlp); |
| |
| static void vio_handleEvent(struct HvLpEvent *event) |
| { |
| HvLpIndex remoteLp; |
| int subtype = (event->xSubtype & VIOMAJOR_SUBTYPE_MASK) |
| >> VIOMAJOR_SUBTYPE_SHIFT; |
| |
| if (hvlpevent_is_int(event)) { |
| remoteLp = event->xSourceLp; |
| /* |
| * The isActive is checked because if the hosting partition |
| * went down and came back up it would not be active but it |
| * would have different source and target instances, in which |
| * case we'd want to reset them. This case really protects |
| * against an unauthorized active partition sending interrupts |
| * or acks to this linux partition. |
| */ |
| if (viopathStatus[remoteLp].isActive |
| && (event->xSourceInstanceId != |
| viopathStatus[remoteLp].mTargetInst)) { |
| printk(VIOPATH_KERN_WARN |
| "message from invalid partition. " |
| "int msg rcvd, source inst (%d) doesnt match (%d)\n", |
| viopathStatus[remoteLp].mTargetInst, |
| event->xSourceInstanceId); |
| return; |
| } |
| |
| if (viopathStatus[remoteLp].isActive |
| && (event->xTargetInstanceId != |
| viopathStatus[remoteLp].mSourceInst)) { |
| printk(VIOPATH_KERN_WARN |
| "message from invalid partition. " |
| "int msg rcvd, target inst (%d) doesnt match (%d)\n", |
| viopathStatus[remoteLp].mSourceInst, |
| event->xTargetInstanceId); |
| return; |
| } |
| } else { |
| remoteLp = event->xTargetLp; |
| if (event->xSourceInstanceId != |
| viopathStatus[remoteLp].mSourceInst) { |
| printk(VIOPATH_KERN_WARN |
| "message from invalid partition. " |
| "ack msg rcvd, source inst (%d) doesnt match (%d)\n", |
| viopathStatus[remoteLp].mSourceInst, |
| event->xSourceInstanceId); |
| return; |
| } |
| |
| if (event->xTargetInstanceId != |
| viopathStatus[remoteLp].mTargetInst) { |
| printk(VIOPATH_KERN_WARN |
| "message from invalid partition. " |
| "viopath: ack msg rcvd, target inst (%d) doesnt match (%d)\n", |
| viopathStatus[remoteLp].mTargetInst, |
| event->xTargetInstanceId); |
| return; |
| } |
| } |
| |
| if (vio_handler[subtype] == NULL) { |
| printk(VIOPATH_KERN_WARN |
| "unexpected virtual io event subtype %d from partition %d\n", |
| event->xSubtype, remoteLp); |
| /* No handler. Ack if necessary */ |
| if (hvlpevent_is_int(event) && hvlpevent_need_ack(event)) { |
| event->xRc = HvLpEvent_Rc_InvalidSubtype; |
| HvCallEvent_ackLpEvent(event); |
| } |
| return; |
| } |
| |
| /* This innocuous little line is where all the real work happens */ |
| (*vio_handler[subtype])(event); |
| } |
| |
| static void viopath_donealloc(void *parm, int number) |
| { |
| struct alloc_parms *parmsp = parm; |
| |
| parmsp->number = number; |
| if (parmsp->used_wait_atomic) |
| atomic_set(&parmsp->wait_atomic, 0); |
| else |
| up(&parmsp->sem); |
| } |
| |
| static int allocateEvents(HvLpIndex remoteLp, int numEvents) |
| { |
| struct alloc_parms parms; |
| |
| if (system_state != SYSTEM_RUNNING) { |
| parms.used_wait_atomic = 1; |
| atomic_set(&parms.wait_atomic, 1); |
| } else { |
| parms.used_wait_atomic = 0; |
| init_MUTEX_LOCKED(&parms.sem); |
| } |
| mf_allocate_lp_events(remoteLp, HvLpEvent_Type_VirtualIo, 250, /* It would be nice to put a real number here! */ |
| numEvents, &viopath_donealloc, &parms); |
| if (system_state != SYSTEM_RUNNING) { |
| while (atomic_read(&parms.wait_atomic)) |
| mb(); |
| } else |
| down(&parms.sem); |
| return parms.number; |
| } |
| |
| int viopath_open(HvLpIndex remoteLp, int subtype, int numReq) |
| { |
| int i; |
| unsigned long flags; |
| int tempNumAllocated; |
| |
| if ((remoteLp >= HVMAXARCHITECTEDLPS) || (remoteLp == HvLpIndexInvalid)) |
| return -EINVAL; |
| |
| subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; |
| if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) |
| return -EINVAL; |
| |
| spin_lock_irqsave(&statuslock, flags); |
| |
| if (!event_buffer_initialised) { |
| for (i = 0; i < VIO_MAX_SUBTYPES; i++) |
| atomic_set(&event_buffer_available[i], 1); |
| event_buffer_initialised = 1; |
| } |
| |
| viopathStatus[remoteLp].users[subtype]++; |
| |
| if (!viopathStatus[remoteLp].isOpen) { |
| viopathStatus[remoteLp].isOpen = 1; |
| HvCallEvent_openLpEventPath(remoteLp, HvLpEvent_Type_VirtualIo); |
| |
| /* |
| * Don't hold the spinlock during an operation that |
| * can sleep. |
| */ |
| spin_unlock_irqrestore(&statuslock, flags); |
| tempNumAllocated = allocateEvents(remoteLp, 1); |
| spin_lock_irqsave(&statuslock, flags); |
| |
| viopathStatus[remoteLp].numberAllocated += tempNumAllocated; |
| |
| if (viopathStatus[remoteLp].numberAllocated == 0) { |
| HvCallEvent_closeLpEventPath(remoteLp, |
| HvLpEvent_Type_VirtualIo); |
| |
| spin_unlock_irqrestore(&statuslock, flags); |
| return -ENOMEM; |
| } |
| |
| viopathStatus[remoteLp].mSourceInst = |
| HvCallEvent_getSourceLpInstanceId(remoteLp, |
| HvLpEvent_Type_VirtualIo); |
| viopathStatus[remoteLp].mTargetInst = |
| HvCallEvent_getTargetLpInstanceId(remoteLp, |
| HvLpEvent_Type_VirtualIo); |
| HvLpEvent_registerHandler(HvLpEvent_Type_VirtualIo, |
| &vio_handleEvent); |
| sendMonMsg(remoteLp); |
| printk(VIOPATH_KERN_INFO "opening connection to partition %d, " |
| "setting sinst %d, tinst %d\n", |
| remoteLp, viopathStatus[remoteLp].mSourceInst, |
| viopathStatus[remoteLp].mTargetInst); |
| } |
| |
| spin_unlock_irqrestore(&statuslock, flags); |
| tempNumAllocated = allocateEvents(remoteLp, numReq); |
| spin_lock_irqsave(&statuslock, flags); |
| viopathStatus[remoteLp].numberAllocated += tempNumAllocated; |
| spin_unlock_irqrestore(&statuslock, flags); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(viopath_open); |
| |
| int viopath_close(HvLpIndex remoteLp, int subtype, int numReq) |
| { |
| unsigned long flags; |
| int i; |
| int numOpen; |
| struct alloc_parms parms; |
| |
| if ((remoteLp >= HVMAXARCHITECTEDLPS) || (remoteLp == HvLpIndexInvalid)) |
| return -EINVAL; |
| |
| subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; |
| if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) |
| return -EINVAL; |
| |
| spin_lock_irqsave(&statuslock, flags); |
| /* |
| * If the viopath_close somehow gets called before a |
| * viopath_open it could decrement to -1 which is a non |
| * recoverable state so we'll prevent this from |
| * happening. |
| */ |
| if (viopathStatus[remoteLp].users[subtype] > 0) |
| viopathStatus[remoteLp].users[subtype]--; |
| |
| spin_unlock_irqrestore(&statuslock, flags); |
| |
| parms.used_wait_atomic = 0; |
| init_MUTEX_LOCKED(&parms.sem); |
| mf_deallocate_lp_events(remoteLp, HvLpEvent_Type_VirtualIo, |
| numReq, &viopath_donealloc, &parms); |
| down(&parms.sem); |
| |
| spin_lock_irqsave(&statuslock, flags); |
| for (i = 0, numOpen = 0; i < VIO_MAX_SUBTYPES; i++) |
| numOpen += viopathStatus[remoteLp].users[i]; |
| |
| if ((viopathStatus[remoteLp].isOpen) && (numOpen == 0)) { |
| printk(VIOPATH_KERN_INFO "closing connection to partition %d", |
| remoteLp); |
| |
| HvCallEvent_closeLpEventPath(remoteLp, |
| HvLpEvent_Type_VirtualIo); |
| viopathStatus[remoteLp].isOpen = 0; |
| viopathStatus[remoteLp].isActive = 0; |
| |
| for (i = 0; i < VIO_MAX_SUBTYPES; i++) |
| atomic_set(&event_buffer_available[i], 0); |
| event_buffer_initialised = 0; |
| } |
| spin_unlock_irqrestore(&statuslock, flags); |
| return 0; |
| } |
| EXPORT_SYMBOL(viopath_close); |
| |
| void *vio_get_event_buffer(int subtype) |
| { |
| subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; |
| if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) |
| return NULL; |
| |
| if (atomic_dec_if_positive(&event_buffer_available[subtype]) == 0) |
| return &event_buffer[subtype * 256]; |
| else |
| return NULL; |
| } |
| EXPORT_SYMBOL(vio_get_event_buffer); |
| |
| void vio_free_event_buffer(int subtype, void *buffer) |
| { |
| subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; |
| if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) { |
| printk(VIOPATH_KERN_WARN |
| "unexpected subtype %d freeing event buffer\n", subtype); |
| return; |
| } |
| |
| if (atomic_read(&event_buffer_available[subtype]) != 0) { |
| printk(VIOPATH_KERN_WARN |
| "freeing unallocated event buffer, subtype %d\n", |
| subtype); |
| return; |
| } |
| |
| if (buffer != &event_buffer[subtype * 256]) { |
| printk(VIOPATH_KERN_WARN |
| "freeing invalid event buffer, subtype %d\n", subtype); |
| } |
| |
| atomic_set(&event_buffer_available[subtype], 1); |
| } |
| EXPORT_SYMBOL(vio_free_event_buffer); |
| |
| static const struct vio_error_entry vio_no_error = |
| { 0, 0, "Non-VIO Error" }; |
| static const struct vio_error_entry vio_unknown_error = |
| { 0, EIO, "Unknown Error" }; |
| |
| static const struct vio_error_entry vio_default_errors[] = { |
| {0x0001, EIO, "No Connection"}, |
| {0x0002, EIO, "No Receiver"}, |
| {0x0003, EIO, "No Buffer Available"}, |
| {0x0004, EBADRQC, "Invalid Message Type"}, |
| {0x0000, 0, NULL}, |
| }; |
| |
| const struct vio_error_entry *vio_lookup_rc( |
| const struct vio_error_entry *local_table, u16 rc) |
| { |
| const struct vio_error_entry *cur; |
| |
| if (!rc) |
| return &vio_no_error; |
| if (local_table) |
| for (cur = local_table; cur->rc; ++cur) |
| if (cur->rc == rc) |
| return cur; |
| for (cur = vio_default_errors; cur->rc; ++cur) |
| if (cur->rc == rc) |
| return cur; |
| return &vio_unknown_error; |
| } |
| EXPORT_SYMBOL(vio_lookup_rc); |