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sgi-xp: isolate xpc_vars_part structure to sn2 only

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Isolate the xpc_vars_part structure of XPC's reserved page to sn2 only.

Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dean Nelson
2008-07-29 22:34:06 -07:00
committed by Linus Torvalds
parent 94bd2708d4
commit e17d416b1b
6 changed files with 644 additions and 629 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/misc/sgi-xp/xpc.h
View File

@@ -227,9 +227,9 @@ xpc_disallow_hb(short partid, struct xpc_vars *vars)
* itself from that partition. It is desirable that the size of this structure * itself from that partition. It is desirable that the size of this structure
* evenly divides into a 128-byte cacheline, such that none of the entries in * evenly divides into a 128-byte cacheline, such that none of the entries in
* this array crosses a 128-byte cacheline boundary. As it is now, each entry * this array crosses a 128-byte cacheline boundary. As it is now, each entry
* occupies a 64-byte cacheline. * occupies 64-bytes.
*/ */
struct xpc_vars_part { struct xpc_vars_part_sn2 {
u64 magic; u64 magic;
u64 openclose_args_pa; /* physical address of open and close args */ u64 openclose_args_pa; /* physical address of open and close args */
@@ -265,8 +265,6 @@ struct xpc_vars_part {
#define XPC_RP_MACH_NASIDS(_rp) (XPC_RP_PART_NASIDS(_rp) + xp_nasid_mask_words) #define XPC_RP_MACH_NASIDS(_rp) (XPC_RP_PART_NASIDS(_rp) + xp_nasid_mask_words)
#define XPC_RP_VARS(_rp) ((struct xpc_vars *)(XPC_RP_MACH_NASIDS(_rp) + \ #define XPC_RP_VARS(_rp) ((struct xpc_vars *)(XPC_RP_MACH_NASIDS(_rp) + \
xp_nasid_mask_words)) xp_nasid_mask_words))
#define XPC_RP_VARS_PART(_rp) ((struct xpc_vars_part *) \
((u8 *)XPC_RP_VARS(_rp) + XPC_RP_VARS_SIZE))
/* /*
* Functions registered by add_timer() or called by kernel_thread() only * Functions registered by add_timer() or called by kernel_thread() only
@@ -541,13 +539,6 @@ struct xpc_partition {
wait_queue_head_t teardown_wq; /* kthread waiting to teardown infra */ wait_queue_head_t teardown_wq; /* kthread waiting to teardown infra */
atomic_t references; /* #of references to infrastructure */ atomic_t references; /* #of references to infrastructure */
/*
* NONE OF THE PRECEDING FIELDS OF THIS STRUCTURE WILL BE CLEARED WHEN
* XPC SETS UP THE NECESSARY INFRASTRUCTURE TO SUPPORT CROSS PARTITION
* COMMUNICATION. ALL OF THE FOLLOWING FIELDS WILL BE CLEARED. (THE
* 'nchannels' FIELD MUST BE THE FIRST OF THE FIELDS TO BE CLEARED.)
*/
u8 nchannels; /* #of defined channels supported */ u8 nchannels; /* #of defined channels supported */
atomic_t nchannels_active; /* #of channels that are not DISCONNECTED */ atomic_t nchannels_active; /* #of channels that are not DISCONNECTED */
atomic_t nchannels_engaged; /* #of channels engaged with remote part */ atomic_t nchannels_engaged; /* #of channels engaged with remote part */
@@ -613,7 +604,7 @@ struct xpc_partition {
* dropped IPIs. These occur whenever an IPI amo write doesn't complete until * dropped IPIs. These occur whenever an IPI amo write doesn't complete until
* after the IPI was received. * after the IPI was received.
*/ */
#define XPC_P_DROPPED_IPI_WAIT (0.25 * HZ) #define XPC_P_DROPPED_IPI_WAIT_INTERVAL (0.25 * HZ)
/* number of seconds to wait for other partitions to disengage */ /* number of seconds to wait for other partitions to disengage */
#define XPC_DISENGAGE_REQUEST_DEFAULT_TIMELIMIT 90 #define XPC_DISENGAGE_REQUEST_DEFAULT_TIMELIMIT 90
@@ -637,13 +628,16 @@ extern void xpc_activate_partition(struct xpc_partition *);
extern void xpc_activate_kthreads(struct xpc_channel *, int); extern void xpc_activate_kthreads(struct xpc_channel *, int);
extern void xpc_create_kthreads(struct xpc_channel *, int, int); extern void xpc_create_kthreads(struct xpc_channel *, int, int);
extern void xpc_disconnect_wait(int); extern void xpc_disconnect_wait(int);
extern enum xp_retval (*xpc_rsvd_page_init) (struct xpc_rsvd_page *); extern enum xp_retval (*xpc_rsvd_page_init) (struct xpc_rsvd_page *);
extern enum xp_retval (*xpc_make_first_contact) (struct xpc_partition *);
extern u64 (*xpc_get_IPI_flags) (struct xpc_partition *);
extern struct xpc_msg *(*xpc_get_deliverable_msg) (struct xpc_channel *);
extern enum xp_retval (*xpc_setup_infrastructure) (struct xpc_partition *);
extern void (*xpc_teardown_infrastructure) (struct xpc_partition *);
/* found in xpc_sn2.c */ /* found in xpc_sn2.c */
extern void xpc_init_sn2(void); extern void xpc_init_sn2(void);
extern struct xpc_vars *xpc_vars; /*>>> eliminate from here */ extern struct xpc_vars *xpc_vars; /*>>> eliminate from here */
extern struct xpc_vars_part *xpc_vars_part; /*>>> eliminate from here */
/* found in xpc_uv.c */ /* found in xpc_uv.c */
extern void xpc_init_uv(void); extern void xpc_init_uv(void);
@@ -670,6 +664,7 @@ extern void xpc_deactivate_partition(const int, struct xpc_partition *,
extern enum xp_retval xpc_initiate_partid_to_nasids(short, void *); extern enum xp_retval xpc_initiate_partid_to_nasids(short, void *);
/* found in xpc_channel.c */ /* found in xpc_channel.c */
extern void *xpc_kzalloc_cacheline_aligned(size_t, gfp_t, void **);
extern void xpc_initiate_connect(int); extern void xpc_initiate_connect(int);
extern void xpc_initiate_disconnect(int); extern void xpc_initiate_disconnect(int);
extern enum xp_retval xpc_initiate_allocate(short, int, u32, void **); extern enum xp_retval xpc_initiate_allocate(short, int, u32, void **);
@@ -677,8 +672,6 @@ extern enum xp_retval xpc_initiate_send(short, int, void *);
extern enum xp_retval xpc_initiate_send_notify(short, int, void *, extern enum xp_retval xpc_initiate_send_notify(short, int, void *,
xpc_notify_func, void *); xpc_notify_func, void *);
extern void xpc_initiate_received(short, int, void *); extern void xpc_initiate_received(short, int, void *);
extern enum xp_retval xpc_setup_infrastructure(struct xpc_partition *);
extern enum xp_retval xpc_pull_remote_vars_part(struct xpc_partition *);
extern void xpc_process_channel_activity(struct xpc_partition *); extern void xpc_process_channel_activity(struct xpc_partition *);
extern void xpc_connected_callout(struct xpc_channel *); extern void xpc_connected_callout(struct xpc_channel *);
extern void xpc_deliver_msg(struct xpc_channel *); extern void xpc_deliver_msg(struct xpc_channel *);
@@ -686,7 +679,6 @@ extern void xpc_disconnect_channel(const int, struct xpc_channel *,
enum xp_retval, unsigned long *); enum xp_retval, unsigned long *);
extern void xpc_disconnect_callout(struct xpc_channel *, enum xp_retval); extern void xpc_disconnect_callout(struct xpc_channel *, enum xp_retval);
extern void xpc_partition_going_down(struct xpc_partition *, enum xp_retval); extern void xpc_partition_going_down(struct xpc_partition *, enum xp_retval);
extern void xpc_teardown_infrastructure(struct xpc_partition *);
static inline void static inline void
xpc_wakeup_channel_mgr(struct xpc_partition *part) xpc_wakeup_channel_mgr(struct xpc_partition *part)

538
drivers/misc/sgi-xp/xpc_channel.c
View File

@@ -27,7 +27,7 @@
/* /*
* Guarantee that the kzalloc'd memory is cacheline aligned. * Guarantee that the kzalloc'd memory is cacheline aligned.
*/ */
static void * void *
xpc_kzalloc_cacheline_aligned(size_t size, gfp_t flags, void **base) xpc_kzalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
{ {
/* see if kzalloc will give us cachline aligned memory by default */ /* see if kzalloc will give us cachline aligned memory by default */
@@ -48,382 +48,6 @@ xpc_kzalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
return (void *)L1_CACHE_ALIGN((u64)*base); return (void *)L1_CACHE_ALIGN((u64)*base);
} }
/*
* Set up the initial values for the XPartition Communication channels.
*/
static void
xpc_initialize_channels(struct xpc_partition *part, short partid)
{
int ch_number;
struct xpc_channel *ch;
for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
ch = &part->channels[ch_number];
ch->partid = partid;
ch->number = ch_number;
ch->flags = XPC_C_DISCONNECTED;
ch->local_GP = &part->local_GPs[ch_number];
ch->local_openclose_args =
&part->local_openclose_args[ch_number];
atomic_set(&ch->kthreads_assigned, 0);
atomic_set(&ch->kthreads_idle, 0);
atomic_set(&ch->kthreads_active, 0);
atomic_set(&ch->references, 0);
atomic_set(&ch->n_to_notify, 0);
spin_lock_init(&ch->lock);
mutex_init(&ch->msg_to_pull_mutex);
init_completion(&ch->wdisconnect_wait);
atomic_set(&ch->n_on_msg_allocate_wq, 0);
init_waitqueue_head(&ch->msg_allocate_wq);
init_waitqueue_head(&ch->idle_wq);
}
}
/*
* Setup the infrastructure necessary to support XPartition Communication
* between the specified remote partition and the local one.
*/
enum xp_retval
xpc_setup_infrastructure(struct xpc_partition *part)
{
int ret, cpuid;
struct timer_list *timer;
short partid = XPC_PARTID(part);
/*
* Zero out MOST of the entry for this partition. Only the fields
* starting with `nchannels' will be zeroed. The preceding fields must
* remain `viable' across partition ups and downs, since they may be
* referenced during this memset() operation.
*/
memset(&part->nchannels, 0, sizeof(struct xpc_partition) -
offsetof(struct xpc_partition, nchannels));
/*
* Allocate all of the channel structures as a contiguous chunk of
* memory.
*/
part->channels = kzalloc(sizeof(struct xpc_channel) * XPC_MAX_NCHANNELS,
GFP_KERNEL);
if (part->channels == NULL) {
dev_err(xpc_chan, "can't get memory for channels\n");
return xpNoMemory;
}
part->nchannels = XPC_MAX_NCHANNELS;
/* allocate all the required GET/PUT values */
part->local_GPs = xpc_kzalloc_cacheline_aligned(XPC_GP_SIZE,
GFP_KERNEL,
&part->local_GPs_base);
if (part->local_GPs == NULL) {
kfree(part->channels);
part->channels = NULL;
dev_err(xpc_chan, "can't get memory for local get/put "
"values\n");
return xpNoMemory;
}
part->remote_GPs = xpc_kzalloc_cacheline_aligned(XPC_GP_SIZE,
GFP_KERNEL,
&part->
remote_GPs_base);
if (part->remote_GPs == NULL) {
dev_err(xpc_chan, "can't get memory for remote get/put "
"values\n");
kfree(part->local_GPs_base);
part->local_GPs = NULL;
kfree(part->channels);
part->channels = NULL;
return xpNoMemory;
}
/* allocate all the required open and close args */
part->local_openclose_args =
xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE, GFP_KERNEL,
&part->local_openclose_args_base);
if (part->local_openclose_args == NULL) {
dev_err(xpc_chan, "can't get memory for local connect args\n");
kfree(part->remote_GPs_base);
part->remote_GPs = NULL;
kfree(part->local_GPs_base);
part->local_GPs = NULL;
kfree(part->channels);
part->channels = NULL;
return xpNoMemory;
}
part->remote_openclose_args =
xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE, GFP_KERNEL,
&part->remote_openclose_args_base);
if (part->remote_openclose_args == NULL) {
dev_err(xpc_chan, "can't get memory for remote connect args\n");
kfree(part->local_openclose_args_base);
part->local_openclose_args = NULL;
kfree(part->remote_GPs_base);
part->remote_GPs = NULL;
kfree(part->local_GPs_base);
part->local_GPs = NULL;
kfree(part->channels);
part->channels = NULL;
return xpNoMemory;
}
xpc_initialize_channels(part, partid);
atomic_set(&part->nchannels_active, 0);
atomic_set(&part->nchannels_engaged, 0);
/* local_IPI_amo were set to 0 by an earlier memset() */
/* Initialize this partitions AMO_t structure */
part->local_IPI_amo_va = xpc_IPI_init(partid);
spin_lock_init(&part->IPI_lock);
atomic_set(&part->channel_mgr_requests, 1);
init_waitqueue_head(&part->channel_mgr_wq);
sprintf(part->IPI_owner, "xpc%02d", partid);
ret = request_irq(SGI_XPC_NOTIFY, xpc_notify_IRQ_handler, IRQF_SHARED,
part->IPI_owner, (void *)(u64)partid);
if (ret != 0) {
dev_err(xpc_chan, "can't register NOTIFY IRQ handler, "
"errno=%d\n", -ret);
kfree(part->remote_openclose_args_base);
part->remote_openclose_args = NULL;
kfree(part->local_openclose_args_base);
part->local_openclose_args = NULL;
kfree(part->remote_GPs_base);
part->remote_GPs = NULL;
kfree(part->local_GPs_base);
part->local_GPs = NULL;
kfree(part->channels);
part->channels = NULL;
return xpLackOfResources;
}
/* Setup a timer to check for dropped IPIs */
timer = &part->dropped_IPI_timer;
init_timer(timer);
timer->function = (void (*)(unsigned long))xpc_dropped_IPI_check;
timer->data = (unsigned long)part;
timer->expires = jiffies + XPC_P_DROPPED_IPI_WAIT;
add_timer(timer);
/*
* With the setting of the partition setup_state to XPC_P_SETUP, we're
* declaring that this partition is ready to go.
*/
part->setup_state = XPC_P_SETUP;
/*
* Setup the per partition specific variables required by the
* remote partition to establish channel connections with us.
*
* The setting of the magic # indicates that these per partition
* specific variables are ready to be used.
*/
xpc_vars_part[partid].GPs_pa = __pa(part->local_GPs);
xpc_vars_part[partid].openclose_args_pa =
__pa(part->local_openclose_args);
xpc_vars_part[partid].IPI_amo_pa = __pa(part->local_IPI_amo_va);
cpuid = raw_smp_processor_id(); /* any CPU in this partition will do */
xpc_vars_part[partid].IPI_nasid = cpuid_to_nasid(cpuid);
xpc_vars_part[partid].IPI_phys_cpuid = cpu_physical_id(cpuid);
xpc_vars_part[partid].nchannels = part->nchannels;
xpc_vars_part[partid].magic = XPC_VP_MAGIC1;
return xpSuccess;
}
/*
* Create a wrapper that hides the underlying mechanism for pulling a cacheline
* (or multiple cachelines) from a remote partition.
*
* src must be a cacheline aligned physical address on the remote partition.
* dst must be a cacheline aligned virtual address on this partition.
* cnt must be cacheline sized
*/
static enum xp_retval
xpc_pull_remote_cachelines(struct xpc_partition *part, void *dst,
const void *src, size_t cnt)
{
enum xp_retval ret;
DBUG_ON((u64)src != L1_CACHE_ALIGN((u64)src));
DBUG_ON((u64)dst != L1_CACHE_ALIGN((u64)dst));
DBUG_ON(cnt != L1_CACHE_ALIGN(cnt));
if (part->act_state == XPC_P_DEACTIVATING)
return part->reason;
ret = xp_remote_memcpy(dst, src, cnt);
if (ret != xpSuccess) {
dev_dbg(xpc_chan, "xp_remote_memcpy() from partition %d failed,"
" ret=%d\n", XPC_PARTID(part), ret);
}
return ret;
}
/*
* Pull the remote per partition specific variables from the specified
* partition.
*/
enum xp_retval
xpc_pull_remote_vars_part(struct xpc_partition *part)
{
u8 buffer[L1_CACHE_BYTES * 2];
struct xpc_vars_part *pulled_entry_cacheline =
(struct xpc_vars_part *)L1_CACHE_ALIGN((u64)buffer);
struct xpc_vars_part *pulled_entry;
u64 remote_entry_cacheline_pa, remote_entry_pa;
short partid = XPC_PARTID(part);
enum xp_retval ret;
/* pull the cacheline that contains the variables we're interested in */
DBUG_ON(part->remote_vars_part_pa !=
L1_CACHE_ALIGN(part->remote_vars_part_pa));
DBUG_ON(sizeof(struct xpc_vars_part) != L1_CACHE_BYTES / 2);
remote_entry_pa = part->remote_vars_part_pa +
sn_partition_id * sizeof(struct xpc_vars_part);
remote_entry_cacheline_pa = (remote_entry_pa & ~(L1_CACHE_BYTES - 1));
pulled_entry = (struct xpc_vars_part *)((u64)pulled_entry_cacheline +
(remote_entry_pa &
(L1_CACHE_BYTES - 1)));
ret = xpc_pull_remote_cachelines(part, pulled_entry_cacheline,
(void *)remote_entry_cacheline_pa,
L1_CACHE_BYTES);
if (ret != xpSuccess) {
dev_dbg(xpc_chan, "failed to pull XPC vars_part from "
"partition %d, ret=%d\n", partid, ret);
return ret;
}
/* see if they've been set up yet */
if (pulled_entry->magic != XPC_VP_MAGIC1 &&
pulled_entry->magic != XPC_VP_MAGIC2) {
if (pulled_entry->magic != 0) {
dev_dbg(xpc_chan, "partition %d's XPC vars_part for "
"partition %d has bad magic value (=0x%lx)\n",
partid, sn_partition_id, pulled_entry->magic);
return xpBadMagic;
}
/* they've not been initialized yet */
return xpRetry;
}
if (xpc_vars_part[partid].magic == XPC_VP_MAGIC1) {
/* validate the variables */
if (pulled_entry->GPs_pa == 0 ||
pulled_entry->openclose_args_pa == 0 ||
pulled_entry->IPI_amo_pa == 0) {
dev_err(xpc_chan, "partition %d's XPC vars_part for "
"partition %d are not valid\n", partid,
sn_partition_id);
return xpInvalidAddress;
}
/* the variables we imported look to be valid */
part->remote_GPs_pa = pulled_entry->GPs_pa;
part->remote_openclose_args_pa =
pulled_entry->openclose_args_pa;
part->remote_IPI_amo_va =
(AMO_t *)__va(pulled_entry->IPI_amo_pa);
part->remote_IPI_nasid = pulled_entry->IPI_nasid;
part->remote_IPI_phys_cpuid = pulled_entry->IPI_phys_cpuid;
if (part->nchannels > pulled_entry->nchannels)
part->nchannels = pulled_entry->nchannels;
/* let the other side know that we've pulled their variables */
xpc_vars_part[partid].magic = XPC_VP_MAGIC2;
}
if (pulled_entry->magic == XPC_VP_MAGIC1)
return xpRetry;
return xpSuccess;
}
/*
* Get the IPI flags and pull the openclose args and/or remote GPs as needed.
*/
static u64
xpc_get_IPI_flags(struct xpc_partition *part)
{
unsigned long irq_flags;
u64 IPI_amo;
enum xp_retval ret;
/*
* See if there are any IPI flags to be handled.
*/
spin_lock_irqsave(&part->IPI_lock, irq_flags);
IPI_amo = part->local_IPI_amo;
if (IPI_amo != 0)
part->local_IPI_amo = 0;
spin_unlock_irqrestore(&part->IPI_lock, irq_flags);
if (XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(IPI_amo)) {
ret = xpc_pull_remote_cachelines(part,
part->remote_openclose_args,
(void *)part->
remote_openclose_args_pa,
XPC_OPENCLOSE_ARGS_SIZE);
if (ret != xpSuccess) {
XPC_DEACTIVATE_PARTITION(part, ret);
dev_dbg(xpc_chan, "failed to pull openclose args from "
"partition %d, ret=%d\n", XPC_PARTID(part),
ret);
/* don't bother processing IPIs anymore */
IPI_amo = 0;
}
}
if (XPC_ANY_MSG_IPI_FLAGS_SET(IPI_amo)) {
ret = xpc_pull_remote_cachelines(part, part->remote_GPs,
(void *)part->remote_GPs_pa,
XPC_GP_SIZE);
if (ret != xpSuccess) {
XPC_DEACTIVATE_PARTITION(part, ret);
dev_dbg(xpc_chan, "failed to pull GPs from partition "
"%d, ret=%d\n", XPC_PARTID(part), ret);
/* don't bother processing IPIs anymore */
IPI_amo = 0;
}
}
return IPI_amo;
}
/* /*
* Allocate the local message queue and the notify queue. * Allocate the local message queue and the notify queue.
*/ */
@@ -1364,59 +988,6 @@ xpc_partition_going_down(struct xpc_partition *part, enum xp_retval reason)
xpc_part_deref(part); xpc_part_deref(part);
} }
/*
* Teardown the infrastructure necessary to support XPartition Communication
* between the specified remote partition and the local one.
*/
void
xpc_teardown_infrastructure(struct xpc_partition *part)
{
short partid = XPC_PARTID(part);
/*
* We start off by making this partition inaccessible to local
* processes by marking it as no longer setup. Then we make it
* inaccessible to remote processes by clearing the XPC per partition
* specific variable's magic # (which indicates that these variables
* are no longer valid) and by ignoring all XPC notify IPIs sent to
* this partition.
*/
DBUG_ON(atomic_read(&part->nchannels_engaged) != 0);
DBUG_ON(atomic_read(&part->nchannels_active) != 0);
DBUG_ON(part->setup_state != XPC_P_SETUP);
part->setup_state = XPC_P_WTEARDOWN;
xpc_vars_part[partid].magic = 0;
free_irq(SGI_XPC_NOTIFY, (void *)(u64)partid);
/*
* Before proceeding with the teardown we have to wait until all
* existing references cease.
*/
wait_event(part->teardown_wq, (atomic_read(&part->references) == 0));
/* now we can begin tearing down the infrastructure */
part->setup_state = XPC_P_TORNDOWN;
/* in case we've still got outstanding timers registered... */
del_timer_sync(&part->dropped_IPI_timer);
kfree(part->remote_openclose_args_base);
part->remote_openclose_args = NULL;
kfree(part->local_openclose_args_base);
part->local_openclose_args = NULL;
kfree(part->remote_GPs_base);
part->remote_GPs = NULL;
kfree(part->local_GPs_base);
part->local_GPs = NULL;
kfree(part->channels);
part->channels = NULL;
part->local_IPI_amo_va = NULL;
}
/* /*
* Called by XP at the time of channel connection registration to cause * Called by XP at the time of channel connection registration to cause
* XPC to establish connections to all currently active partitions. * XPC to establish connections to all currently active partitions.
@@ -1974,113 +1545,6 @@ xpc_initiate_send_notify(short partid, int ch_number, void *payload,
return ret; return ret;
} }
static struct xpc_msg *
xpc_pull_remote_msg(struct xpc_channel *ch, s64 get)
{
struct xpc_partition *part = &xpc_partitions[ch->partid];
struct xpc_msg *remote_msg, *msg;
u32 msg_index, nmsgs;
u64 msg_offset;
enum xp_retval ret;
if (mutex_lock_interruptible(&ch->msg_to_pull_mutex) != 0) {
/* we were interrupted by a signal */
return NULL;
}
while (get >= ch->next_msg_to_pull) {
/* pull as many messages as are ready and able to be pulled */
msg_index = ch->next_msg_to_pull % ch->remote_nentries;
DBUG_ON(ch->next_msg_to_pull >= ch->w_remote_GP.put);
nmsgs = ch->w_remote_GP.put - ch->next_msg_to_pull;
if (msg_index + nmsgs > ch->remote_nentries) {
/* ignore the ones that wrap the msg queue for now */
nmsgs = ch->remote_nentries - msg_index;
}
msg_offset = msg_index * ch->msg_size;
msg = (struct xpc_msg *)((u64)ch->remote_msgqueue + msg_offset);
remote_msg = (struct xpc_msg *)(ch->remote_msgqueue_pa +
msg_offset);
ret = xpc_pull_remote_cachelines(part, msg, remote_msg,
nmsgs * ch->msg_size);
if (ret != xpSuccess) {
dev_dbg(xpc_chan, "failed to pull %d msgs starting with"
" msg %ld from partition %d, channel=%d, "
"ret=%d\n", nmsgs, ch->next_msg_to_pull,
ch->partid, ch->number, ret);
XPC_DEACTIVATE_PARTITION(part, ret);
mutex_unlock(&ch->msg_to_pull_mutex);
return NULL;
}
ch->next_msg_to_pull += nmsgs;
}
mutex_unlock(&ch->msg_to_pull_mutex);
/* return the message we were looking for */
msg_offset = (get % ch->remote_nentries) * ch->msg_size;
msg = (struct xpc_msg *)((u64)ch->remote_msgqueue + msg_offset);
return msg;
}
/*
* Get a message to be delivered.
*/
static struct xpc_msg *
xpc_get_deliverable_msg(struct xpc_channel *ch)
{
struct xpc_msg *msg = NULL;
s64 get;
do {
if (ch->flags & XPC_C_DISCONNECTING)
break;
get = ch->w_local_GP.get;
rmb(); /* guarantee that .get loads before .put */
if (get == ch->w_remote_GP.put)
break;
/* There are messages waiting to be pulled and delivered.
* We need to try to secure one for ourselves. We'll do this
* by trying to increment w_local_GP.get and hope that no one
* else beats us to it. If they do, we'll we'll simply have
* to try again for the next one.
*/
if (cmpxchg(&ch->w_local_GP.get, get, get + 1) == get) {
/* we got the entry referenced by get */
dev_dbg(xpc_chan, "w_local_GP.get changed to %ld, "
"partid=%d, channel=%d\n", get + 1,
ch->partid, ch->number);
/* pull the message from the remote partition */
msg = xpc_pull_remote_msg(ch, get);
DBUG_ON(msg != NULL && msg->number != get);
DBUG_ON(msg != NULL && (msg->flags & XPC_M_DONE));
DBUG_ON(msg != NULL && !(msg->flags & XPC_M_READY));
break;
}
} while (1);
return msg;
}
/* /*
* Deliver a message to its intended recipient. * Deliver a message to its intended recipient.
*/ */

97
drivers/misc/sgi-xp/xpc_main.c
View File

@@ -176,6 +176,12 @@ static struct notifier_block xpc_die_notifier = {
}; };
enum xp_retval (*xpc_rsvd_page_init) (struct xpc_rsvd_page *rp); enum xp_retval (*xpc_rsvd_page_init) (struct xpc_rsvd_page *rp);
enum xp_retval (*xpc_make_first_contact) (struct xpc_partition *part);
u64 (*xpc_get_IPI_flags) (struct xpc_partition *part);
struct xpc_msg *(*xpc_get_deliverable_msg) (struct xpc_channel *ch);
enum xp_retval (*xpc_setup_infrastructure) (struct xpc_partition *part);
void (*xpc_teardown_infrastructure) (struct xpc_partition *part);
/* /*
* Timer function to enforce the timelimit on the partition disengage request. * Timer function to enforce the timelimit on the partition disengage request.
@@ -312,38 +318,9 @@ xpc_initiate_discovery(void *ignore)
return 0; return 0;
} }
/*
* Establish first contact with the remote partititon. This involves pulling
* the XPC per partition variables from the remote partition and waiting for
* the remote partition to pull ours.
*/
static enum xp_retval
xpc_make_first_contact(struct xpc_partition *part)
{
enum xp_retval ret;
while ((ret = xpc_pull_remote_vars_part(part)) != xpSuccess) {
if (ret != xpRetry) {
XPC_DEACTIVATE_PARTITION(part, ret);
return ret;
}
dev_dbg(xpc_chan, "waiting to make first contact with "
"partition %d\n", XPC_PARTID(part));
/* wait a 1/4 of a second or so */
(void)msleep_interruptible(250);
if (part->act_state == XPC_P_DEACTIVATING)
return part->reason;
}
return xpc_mark_partition_active(part);
}
/* /*
* The first kthread assigned to a newly activated partition is the one * The first kthread assigned to a newly activated partition is the one
* created by XPC HB with which it calls xpc_partition_up(). XPC hangs on to * created by XPC HB with which it calls xpc_activating(). XPC hangs on to
* that kthread until the partition is brought down, at which time that kthread * that kthread until the partition is brought down, at which time that kthread
* returns back to XPC HB. (The return of that kthread will signify to XPC HB * returns back to XPC HB. (The return of that kthread will signify to XPC HB
* that XPC has dismantled all communication infrastructure for the associated * that XPC has dismantled all communication infrastructure for the associated
@@ -393,41 +370,10 @@ xpc_channel_mgr(struct xpc_partition *part)
* upped partition. * upped partition.
* *
* The kthread that was created by XPC HB and which setup the XPC * The kthread that was created by XPC HB and which setup the XPC
* infrastructure will remain assigned to the partition until the partition * infrastructure will remain assigned to the partition becoming the channel
* goes down. At which time the kthread will teardown the XPC infrastructure * manager for that partition until the partition is deactivating, at which
* and then exit. * time the kthread will teardown the XPC infrastructure and then exit.
*
* XPC HB will put the remote partition's XPC per partition specific variables
* physical address into xpc_partitions[partid].remote_vars_part_pa prior to
* calling xpc_partition_up().
*/ */
static void
xpc_partition_up(struct xpc_partition *part)
{
DBUG_ON(part->channels != NULL);
dev_dbg(xpc_chan, "activating partition %d\n", XPC_PARTID(part));
if (xpc_setup_infrastructure(part) != xpSuccess)
return;
/*
* The kthread that XPC HB called us with will become the
* channel manager for this partition. It will not return
* back to XPC HB until the partition's XPC infrastructure
* has been dismantled.
*/
(void)xpc_part_ref(part); /* this will always succeed */
if (xpc_make_first_contact(part) == xpSuccess)
xpc_channel_mgr(part);
xpc_part_deref(part);
xpc_teardown_infrastructure(part);
}
static int static int
xpc_activating(void *__partid) xpc_activating(void *__partid)
{ {
@@ -453,7 +399,7 @@ xpc_activating(void *__partid)
XPC_SET_REASON(part, 0, 0); XPC_SET_REASON(part, 0, 0);
spin_unlock_irqrestore(&part->act_lock, irq_flags); spin_unlock_irqrestore(&part->act_lock, irq_flags);
dev_dbg(xpc_part, "bringing partition %d up\n", partid); dev_dbg(xpc_part, "activating partition %d\n", partid);
/* /*
* Register the remote partition's AMOs with SAL so it can handle * Register the remote partition's AMOs with SAL so it can handle
@@ -467,7 +413,7 @@ xpc_activating(void *__partid)
*/ */
if (sn_register_xp_addr_region(part->remote_amos_page_pa, if (sn_register_xp_addr_region(part->remote_amos_page_pa,
PAGE_SIZE, 1) < 0) { PAGE_SIZE, 1) < 0) {
dev_warn(xpc_part, "xpc_partition_up(%d) failed to register " dev_warn(xpc_part, "xpc_activating(%d) failed to register "
"xp_addr region\n", partid); "xp_addr region\n", partid);
spin_lock_irqsave(&part->act_lock, irq_flags); spin_lock_irqsave(&part->act_lock, irq_flags);
@@ -481,11 +427,18 @@ xpc_activating(void *__partid)
xpc_allow_hb(partid, xpc_vars); xpc_allow_hb(partid, xpc_vars);
xpc_IPI_send_activated(part); xpc_IPI_send_activated(part);
/* if (xpc_setup_infrastructure(part) == xpSuccess) {
* xpc_partition_up() holds this thread and marks this partition as (void)xpc_part_ref(part); /* this will always succeed */
* XPC_P_ACTIVE by calling xpc_hb_mark_active().
*/ if (xpc_make_first_contact(part) == xpSuccess) {
(void)xpc_partition_up(part); xpc_mark_partition_active(part);
xpc_channel_mgr(part);
/* won't return until partition is deactivating */
}
xpc_part_deref(part);
xpc_teardown_infrastructure(part);
}
xpc_disallow_hb(partid, xpc_vars); xpc_disallow_hb(partid, xpc_vars);
xpc_mark_partition_inactive(part); xpc_mark_partition_inactive(part);
@@ -568,7 +521,7 @@ xpc_dropped_IPI_check(struct xpc_partition *part)
xpc_check_for_channel_activity(part); xpc_check_for_channel_activity(part);
part->dropped_IPI_timer.expires = jiffies + part->dropped_IPI_timer.expires = jiffies +
XPC_P_DROPPED_IPI_WAIT; XPC_P_DROPPED_IPI_WAIT_INTERVAL;
add_timer(&part->dropped_IPI_timer); add_timer(&part->dropped_IPI_timer);
xpc_part_deref(part); xpc_part_deref(part);
} }

1
drivers/misc/sgi-xp/xpc_partition.c
View File

@@ -486,6 +486,7 @@ xpc_update_partition_info(struct xpc_partition *part, u8 remote_rp_version,
dev_dbg(xpc_part, " last_heartbeat = 0x%016lx\n", dev_dbg(xpc_part, " last_heartbeat = 0x%016lx\n",
part->last_heartbeat); part->last_heartbeat);
/* >>> remote_vars_part_pa and vars_part_pa are sn2 only!!! */
part->remote_vars_part_pa = remote_vars->vars_part_pa; part->remote_vars_part_pa = remote_vars->vars_part_pa;
dev_dbg(xpc_part, " remote_vars_part_pa = 0x%016lx\n", dev_dbg(xpc_part, " remote_vars_part_pa = 0x%016lx\n",
part->remote_vars_part_pa); part->remote_vars_part_pa);

563
drivers/misc/sgi-xp/xpc_sn2.c
View File

@@ -14,12 +14,13 @@
*/ */
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/delay.h>
#include <asm/uncached.h> #include <asm/uncached.h>
#include <asm/sn/sn_sal.h> #include <asm/sn/sn_sal.h>
#include "xpc.h" #include "xpc.h"
struct xpc_vars *xpc_vars; struct xpc_vars *xpc_vars;
struct xpc_vars_part *xpc_vars_part; static struct xpc_vars_part_sn2 *xpc_vars_part; /* >>> Add _sn2 suffix? */
static enum xp_retval static enum xp_retval
xpc_rsvd_page_init_sn2(struct xpc_rsvd_page *rp) xpc_rsvd_page_init_sn2(struct xpc_rsvd_page *rp)
@@ -33,7 +34,10 @@ xpc_rsvd_page_init_sn2(struct xpc_rsvd_page *rp)
rp->sn.vars_pa = __pa(xpc_vars); rp->sn.vars_pa = __pa(xpc_vars);
xpc_vars_part = XPC_RP_VARS_PART(rp); /* vars_part array follows immediately after vars */
xpc_vars_part = (struct xpc_vars_part_sn2 *)((u8 *)XPC_RP_VARS(rp) +
XPC_RP_VARS_SIZE);
/* /*
* Before clearing xpc_vars, see if a page of AMOs had been previously * Before clearing xpc_vars, see if a page of AMOs had been previously
@@ -85,7 +89,7 @@ xpc_rsvd_page_init_sn2(struct xpc_rsvd_page *rp)
xpc_vars->amos_page = amos_page; /* save for next load of XPC */ xpc_vars->amos_page = amos_page; /* save for next load of XPC */
/* clear xpc_vars_part */ /* clear xpc_vars_part */
memset((u64 *)xpc_vars_part, 0, sizeof(struct xpc_vars_part) * memset((u64 *)xpc_vars_part, 0, sizeof(struct xpc_vars_part_sn2) *
xp_max_npartitions); xp_max_npartitions);
/* initialize the activate IRQ related AMO variables */ /* initialize the activate IRQ related AMO variables */
@@ -99,10 +103,563 @@ xpc_rsvd_page_init_sn2(struct xpc_rsvd_page *rp)
return xpSuccess; return xpSuccess;
} }
/*
* Setup the infrastructure necessary to support XPartition Communication
* between the specified remote partition and the local one.
*/
static enum xp_retval
xpc_setup_infrastructure_sn2(struct xpc_partition *part)
{
enum xp_retval retval;
int ret;
int cpuid;
int ch_number;
struct xpc_channel *ch;
struct timer_list *timer;
short partid = XPC_PARTID(part);
/*
* Allocate all of the channel structures as a contiguous chunk of
* memory.
*/
DBUG_ON(part->channels != NULL);
part->channels = kzalloc(sizeof(struct xpc_channel) * XPC_MAX_NCHANNELS,
GFP_KERNEL);
if (part->channels == NULL) {
dev_err(xpc_chan, "can't get memory for channels\n");
return xpNoMemory;
}
/* allocate all the required GET/PUT values */
part->local_GPs = xpc_kzalloc_cacheline_aligned(XPC_GP_SIZE,
GFP_KERNEL,
&part->local_GPs_base);
if (part->local_GPs == NULL) {
dev_err(xpc_chan, "can't get memory for local get/put "
"values\n");
retval = xpNoMemory;
goto out_1;
}
part->remote_GPs = xpc_kzalloc_cacheline_aligned(XPC_GP_SIZE,
GFP_KERNEL,
&part->
remote_GPs_base);
if (part->remote_GPs == NULL) {
dev_err(xpc_chan, "can't get memory for remote get/put "
"values\n");
retval = xpNoMemory;
goto out_2;
}
part->remote_GPs_pa = 0;
/* allocate all the required open and close args */
part->local_openclose_args =
xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE, GFP_KERNEL,
&part->local_openclose_args_base);
if (part->local_openclose_args == NULL) {
dev_err(xpc_chan, "can't get memory for local connect args\n");
retval = xpNoMemory;
goto out_3;
}
part->remote_openclose_args =
xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE, GFP_KERNEL,
&part->remote_openclose_args_base);
if (part->remote_openclose_args == NULL) {
dev_err(xpc_chan, "can't get memory for remote connect args\n");
retval = xpNoMemory;
goto out_4;
}
part->remote_openclose_args_pa = 0;
part->local_IPI_amo_va = xpc_IPI_init(partid);
part->local_IPI_amo = 0;
spin_lock_init(&part->IPI_lock);
part->remote_IPI_nasid = 0;
part->remote_IPI_phys_cpuid = 0;
part->remote_IPI_amo_va = NULL;
atomic_set(&part->channel_mgr_requests, 1);
init_waitqueue_head(&part->channel_mgr_wq);
sprintf(part->IPI_owner, "xpc%02d", partid);
ret = request_irq(SGI_XPC_NOTIFY, xpc_notify_IRQ_handler, IRQF_SHARED,
part->IPI_owner, (void *)(u64)partid);
if (ret != 0) {
dev_err(xpc_chan, "can't register NOTIFY IRQ handler, "
"errno=%d\n", -ret);
retval = xpLackOfResources;
goto out_5;
}
/* Setup a timer to check for dropped IPIs */
timer = &part->dropped_IPI_timer;
init_timer(timer);
timer->function = (void (*)(unsigned long))xpc_dropped_IPI_check;
timer->data = (unsigned long)part;
timer->expires = jiffies + XPC_P_DROPPED_IPI_WAIT_INTERVAL;
add_timer(timer);
part->nchannels = XPC_MAX_NCHANNELS;
atomic_set(&part->nchannels_active, 0);
atomic_set(&part->nchannels_engaged, 0);
for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
ch = &part->channels[ch_number];
ch->partid = partid;
ch->number = ch_number;
ch->flags = XPC_C_DISCONNECTED;
ch->local_GP = &part->local_GPs[ch_number];
ch->local_openclose_args =
&part->local_openclose_args[ch_number];
atomic_set(&ch->kthreads_assigned, 0);
atomic_set(&ch->kthreads_idle, 0);
atomic_set(&ch->kthreads_active, 0);
atomic_set(&ch->references, 0);
atomic_set(&ch->n_to_notify, 0);
spin_lock_init(&ch->lock);
mutex_init(&ch->msg_to_pull_mutex);
init_completion(&ch->wdisconnect_wait);
atomic_set(&ch->n_on_msg_allocate_wq, 0);
init_waitqueue_head(&ch->msg_allocate_wq);
init_waitqueue_head(&ch->idle_wq);
}
/*
* With the setting of the partition setup_state to XPC_P_SETUP, we're
* declaring that this partition is ready to go.
*/
part->setup_state = XPC_P_SETUP;
/*
* Setup the per partition specific variables required by the
* remote partition to establish channel connections with us.
*
* The setting of the magic # indicates that these per partition
* specific variables are ready to be used.
*/
xpc_vars_part[partid].GPs_pa = __pa(part->local_GPs);
xpc_vars_part[partid].openclose_args_pa =
__pa(part->local_openclose_args);
xpc_vars_part[partid].IPI_amo_pa = __pa(part->local_IPI_amo_va);
cpuid = raw_smp_processor_id(); /* any CPU in this partition will do */
xpc_vars_part[partid].IPI_nasid = cpuid_to_nasid(cpuid);
xpc_vars_part[partid].IPI_phys_cpuid = cpu_physical_id(cpuid);
xpc_vars_part[partid].nchannels = part->nchannels;
xpc_vars_part[partid].magic = XPC_VP_MAGIC1;
return xpSuccess;
/* setup of infrastructure failed */
out_5:
kfree(part->remote_openclose_args_base);
part->remote_openclose_args = NULL;
out_4:
kfree(part->local_openclose_args_base);
part->local_openclose_args = NULL;
out_3:
kfree(part->remote_GPs_base);
part->remote_GPs = NULL;
out_2:
kfree(part->local_GPs_base);
part->local_GPs = NULL;
out_1:
kfree(part->channels);
part->channels = NULL;
return retval;
}
/*
* Teardown the infrastructure necessary to support XPartition Communication
* between the specified remote partition and the local one.
*/
static void
xpc_teardown_infrastructure_sn2(struct xpc_partition *part)
{
short partid = XPC_PARTID(part);
/*
* We start off by making this partition inaccessible to local
* processes by marking it as no longer setup. Then we make it
* inaccessible to remote processes by clearing the XPC per partition
* specific variable's magic # (which indicates that these variables
* are no longer valid) and by ignoring all XPC notify IPIs sent to
* this partition.
*/
DBUG_ON(atomic_read(&part->nchannels_engaged) != 0);
DBUG_ON(atomic_read(&part->nchannels_active) != 0);
DBUG_ON(part->setup_state != XPC_P_SETUP);
part->setup_state = XPC_P_WTEARDOWN;
xpc_vars_part[partid].magic = 0;
free_irq(SGI_XPC_NOTIFY, (void *)(u64)partid);
/*
* Before proceeding with the teardown we have to wait until all
* existing references cease.
*/
wait_event(part->teardown_wq, (atomic_read(&part->references) == 0));
/* now we can begin tearing down the infrastructure */
part->setup_state = XPC_P_TORNDOWN;
/* in case we've still got outstanding timers registered... */
del_timer_sync(&part->dropped_IPI_timer);
kfree(part->remote_openclose_args_base);
part->remote_openclose_args = NULL;
kfree(part->local_openclose_args_base);
part->local_openclose_args = NULL;
kfree(part->remote_GPs_base);
part->remote_GPs = NULL;
kfree(part->local_GPs_base);
part->local_GPs = NULL;
kfree(part->channels);
part->channels = NULL;
part->local_IPI_amo_va = NULL;
}
/*
* Create a wrapper that hides the underlying mechanism for pulling a cacheline
* (or multiple cachelines) from a remote partition.
*
* src must be a cacheline aligned physical address on the remote partition.
* dst must be a cacheline aligned virtual address on this partition.
* cnt must be cacheline sized
*/
/* >>> Replace this function by call to xp_remote_memcpy() or bte_copy()? */
static enum xp_retval
xpc_pull_remote_cachelines_sn2(struct xpc_partition *part, void *dst,
const void *src, size_t cnt)
{
enum xp_retval ret;
DBUG_ON((u64)src != L1_CACHE_ALIGN((u64)src));
DBUG_ON((u64)dst != L1_CACHE_ALIGN((u64)dst));
DBUG_ON(cnt != L1_CACHE_ALIGN(cnt));
if (part->act_state == XPC_P_DEACTIVATING)
return part->reason;
ret = xp_remote_memcpy(dst, src, cnt);
if (ret != xpSuccess) {
dev_dbg(xpc_chan, "xp_remote_memcpy() from partition %d failed,"
" ret=%d\n", XPC_PARTID(part), ret);
}
return ret;
}
/*
* Pull the remote per partition specific variables from the specified
* partition.
*/
static enum xp_retval
xpc_pull_remote_vars_part_sn2(struct xpc_partition *part)
{
u8 buffer[L1_CACHE_BYTES * 2];
struct xpc_vars_part_sn2 *pulled_entry_cacheline =
(struct xpc_vars_part_sn2 *)L1_CACHE_ALIGN((u64)buffer);
struct xpc_vars_part_sn2 *pulled_entry;
u64 remote_entry_cacheline_pa, remote_entry_pa;
short partid = XPC_PARTID(part);
enum xp_retval ret;
/* pull the cacheline that contains the variables we're interested in */
DBUG_ON(part->remote_vars_part_pa !=
L1_CACHE_ALIGN(part->remote_vars_part_pa));
DBUG_ON(sizeof(struct xpc_vars_part_sn2) != L1_CACHE_BYTES / 2);
remote_entry_pa = part->remote_vars_part_pa +
sn_partition_id * sizeof(struct xpc_vars_part_sn2);
remote_entry_cacheline_pa = (remote_entry_pa & ~(L1_CACHE_BYTES - 1));
pulled_entry = (struct xpc_vars_part_sn2 *)((u64)pulled_entry_cacheline
+ (remote_entry_pa &
(L1_CACHE_BYTES - 1)));
ret = xpc_pull_remote_cachelines_sn2(part, pulled_entry_cacheline,
(void *)remote_entry_cacheline_pa,
L1_CACHE_BYTES);
if (ret != xpSuccess) {
dev_dbg(xpc_chan, "failed to pull XPC vars_part from "
"partition %d, ret=%d\n", partid, ret);
return ret;
}
/* see if they've been set up yet */
if (pulled_entry->magic != XPC_VP_MAGIC1 &&
pulled_entry->magic != XPC_VP_MAGIC2) {
if (pulled_entry->magic != 0) {
dev_dbg(xpc_chan, "partition %d's XPC vars_part for "
"partition %d has bad magic value (=0x%lx)\n",
partid, sn_partition_id, pulled_entry->magic);
return xpBadMagic;
}
/* they've not been initialized yet */
return xpRetry;
}
if (xpc_vars_part[partid].magic == XPC_VP_MAGIC1) {
/* validate the variables */
if (pulled_entry->GPs_pa == 0 ||
pulled_entry->openclose_args_pa == 0 ||
pulled_entry->IPI_amo_pa == 0) {
dev_err(xpc_chan, "partition %d's XPC vars_part for "
"partition %d are not valid\n", partid,
sn_partition_id);
return xpInvalidAddress;
}
/* the variables we imported look to be valid */
part->remote_GPs_pa = pulled_entry->GPs_pa;
part->remote_openclose_args_pa =
pulled_entry->openclose_args_pa;
part->remote_IPI_amo_va =
(AMO_t *)__va(pulled_entry->IPI_amo_pa);
part->remote_IPI_nasid = pulled_entry->IPI_nasid;
part->remote_IPI_phys_cpuid = pulled_entry->IPI_phys_cpuid;
if (part->nchannels > pulled_entry->nchannels)
part->nchannels = pulled_entry->nchannels;
/* let the other side know that we've pulled their variables */
xpc_vars_part[partid].magic = XPC_VP_MAGIC2;
}
if (pulled_entry->magic == XPC_VP_MAGIC1)
return xpRetry;
return xpSuccess;
}
/*
* Establish first contact with the remote partititon. This involves pulling
* the XPC per partition variables from the remote partition and waiting for
* the remote partition to pull ours.
*/
static enum xp_retval
xpc_make_first_contact_sn2(struct xpc_partition *part)
{
enum xp_retval ret;
while ((ret = xpc_pull_remote_vars_part_sn2(part)) != xpSuccess) {
if (ret != xpRetry) {
XPC_DEACTIVATE_PARTITION(part, ret);
return ret;
}
dev_dbg(xpc_part, "waiting to make first contact with "
"partition %d\n", XPC_PARTID(part));
/* wait a 1/4 of a second or so */
(void)msleep_interruptible(250);
if (part->act_state == XPC_P_DEACTIVATING)
return part->reason;
}
return xpSuccess;
}
/*
* Get the IPI flags and pull the openclose args and/or remote GPs as needed.
*/
static u64
xpc_get_IPI_flags_sn2(struct xpc_partition *part)
{
unsigned long irq_flags;
u64 IPI_amo;
enum xp_retval ret;
/*
* See if there are any IPI flags to be handled.
*/
spin_lock_irqsave(&part->IPI_lock, irq_flags);
IPI_amo = part->local_IPI_amo;
if (IPI_amo != 0)
part->local_IPI_amo = 0;
spin_unlock_irqrestore(&part->IPI_lock, irq_flags);
if (XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(IPI_amo)) {
ret = xpc_pull_remote_cachelines_sn2(part,
part->remote_openclose_args,
(void *)part->
remote_openclose_args_pa,
XPC_OPENCLOSE_ARGS_SIZE);
if (ret != xpSuccess) {
XPC_DEACTIVATE_PARTITION(part, ret);
dev_dbg(xpc_chan, "failed to pull openclose args from "
"partition %d, ret=%d\n", XPC_PARTID(part),
ret);
/* don't bother processing IPIs anymore */
IPI_amo = 0;
}
}
if (XPC_ANY_MSG_IPI_FLAGS_SET(IPI_amo)) {
ret = xpc_pull_remote_cachelines_sn2(part, part->remote_GPs,
(void *)part->remote_GPs_pa,
XPC_GP_SIZE);
if (ret != xpSuccess) {
XPC_DEACTIVATE_PARTITION(part, ret);
dev_dbg(xpc_chan, "failed to pull GPs from partition "
"%d, ret=%d\n", XPC_PARTID(part), ret);
/* don't bother processing IPIs anymore */
IPI_amo = 0;
}
}
return IPI_amo;
}
static struct xpc_msg *
xpc_pull_remote_msg_sn2(struct xpc_channel *ch, s64 get)
{
struct xpc_partition *part = &xpc_partitions[ch->partid];
struct xpc_msg *remote_msg, *msg;
u32 msg_index, nmsgs;
u64 msg_offset;
enum xp_retval ret;
if (mutex_lock_interruptible(&ch->msg_to_pull_mutex) != 0) {
/* we were interrupted by a signal */
return NULL;
}
while (get >= ch->next_msg_to_pull) {
/* pull as many messages as are ready and able to be pulled */
msg_index = ch->next_msg_to_pull % ch->remote_nentries;
DBUG_ON(ch->next_msg_to_pull >= ch->w_remote_GP.put);
nmsgs = ch->w_remote_GP.put - ch->next_msg_to_pull;
if (msg_index + nmsgs > ch->remote_nentries) {
/* ignore the ones that wrap the msg queue for now */
nmsgs = ch->remote_nentries - msg_index;
}
msg_offset = msg_index * ch->msg_size;
msg = (struct xpc_msg *)((u64)ch->remote_msgqueue + msg_offset);
remote_msg = (struct xpc_msg *)(ch->remote_msgqueue_pa +
msg_offset);
ret = xpc_pull_remote_cachelines_sn2(part, msg, remote_msg,
nmsgs * ch->msg_size);
if (ret != xpSuccess) {
dev_dbg(xpc_chan, "failed to pull %d msgs starting with"
" msg %ld from partition %d, channel=%d, "
"ret=%d\n", nmsgs, ch->next_msg_to_pull,
ch->partid, ch->number, ret);
XPC_DEACTIVATE_PARTITION(part, ret);
mutex_unlock(&ch->msg_to_pull_mutex);
return NULL;
}
ch->next_msg_to_pull += nmsgs;
}
mutex_unlock(&ch->msg_to_pull_mutex);
/* return the message we were looking for */
msg_offset = (get % ch->remote_nentries) * ch->msg_size;
msg = (struct xpc_msg *)((u64)ch->remote_msgqueue + msg_offset);
return msg;
}
/*
* Get a message to be delivered.
*/
static struct xpc_msg *
xpc_get_deliverable_msg_sn2(struct xpc_channel *ch)
{
struct xpc_msg *msg = NULL;
s64 get;
do {
if (ch->flags & XPC_C_DISCONNECTING)
break;
get = ch->w_local_GP.get;
rmb(); /* guarantee that .get loads before .put */
if (get == ch->w_remote_GP.put)
break;
/* There are messages waiting to be pulled and delivered.
* We need to try to secure one for ourselves. We'll do this
* by trying to increment w_local_GP.get and hope that no one
* else beats us to it. If they do, we'll we'll simply have
* to try again for the next one.
*/
if (cmpxchg(&ch->w_local_GP.get, get, get + 1) == get) {
/* we got the entry referenced by get */
dev_dbg(xpc_chan, "w_local_GP.get changed to %ld, "
"partid=%d, channel=%d\n", get + 1,
ch->partid, ch->number);
/* pull the message from the remote partition */
msg = xpc_pull_remote_msg_sn2(ch, get);
DBUG_ON(msg != NULL && msg->number != get);
DBUG_ON(msg != NULL && (msg->flags & XPC_M_DONE));
DBUG_ON(msg != NULL && !(msg->flags & XPC_M_READY));
break;
}
} while (1);
return msg;
}
void void
xpc_init_sn2(void) xpc_init_sn2(void)
{ {
xpc_rsvd_page_init = xpc_rsvd_page_init_sn2; xpc_rsvd_page_init = xpc_rsvd_page_init_sn2;
xpc_setup_infrastructure = xpc_setup_infrastructure_sn2;
xpc_teardown_infrastructure = xpc_teardown_infrastructure_sn2;
xpc_make_first_contact = xpc_make_first_contact_sn2;
xpc_get_IPI_flags = xpc_get_IPI_flags_sn2;
xpc_get_deliverable_msg = xpc_get_deliverable_msg_sn2;
} }
void void

48
drivers/misc/sgi-xp/xpc_uv.c
View File

@@ -36,10 +36,58 @@ xpc_rsvd_page_init_uv(struct xpc_rsvd_page *rp)
return xpSuccess; return xpSuccess;
} }
/*
* Setup the infrastructure necessary to support XPartition Communication
* between the specified remote partition and the local one.
*/
static enum xp_retval
xpc_setup_infrastructure_uv(struct xpc_partition *part)
{
/* >>> this function needs fleshing out */
return xpUnsupported;
}
/*
* Teardown the infrastructure necessary to support XPartition Communication
* between the specified remote partition and the local one.
*/
static void
xpc_teardown_infrastructure_uv(struct xpc_partition *part)
{
/* >>> this function needs fleshing out */
return;
}
static enum xp_retval
xpc_make_first_contact_uv(struct xpc_partition *part)
{
/* >>> this function needs fleshing out */
return xpUnsupported;
}
static u64
xpc_get_IPI_flags_uv(struct xpc_partition *part)
{
/* >>> this function needs fleshing out */
return 0UL;
}
static struct xpc_msg *
xpc_get_deliverable_msg_uv(struct xpc_channel *ch)
{
/* >>> this function needs fleshing out */
return NULL;
}
void void
xpc_init_uv(void) xpc_init_uv(void)
{ {
xpc_rsvd_page_init = xpc_rsvd_page_init_uv; xpc_rsvd_page_init = xpc_rsvd_page_init_uv;
xpc_setup_infrastructure = xpc_setup_infrastructure_uv;
xpc_teardown_infrastructure = xpc_teardown_infrastructure_uv;
xpc_make_first_contact = xpc_make_first_contact_uv;
xpc_get_IPI_flags = xpc_get_IPI_flags_uv;
xpc_get_deliverable_msg = xpc_get_deliverable_msg_uv;
} }
void void