sgi-xp: separate chctl_flags from XPC's notify IRQ (7fb5e59d) · Commits · e / devices / android_kernel_oneplus_sm8150

drivers/misc/sgi-xp/xpc.h

+75 −49

Original line number	Original line	Diff line number	Diff line
	@@ -186,9 +186,10 @@ struct xpc_vars_part_sn2 {
	u64 openclose_args_pa; /* physical address of open and close args */		u64 openclose_args_pa; /* physical address of open and close args */
	u64 GPs_pa; /* physical address of Get/Put values */		u64 GPs_pa; /* physical address of Get/Put values */

	u64 IPI_amo_pa; /* physical address of IPI AMO_t structure */		u64 chctl_amo_pa; /* physical address of chctl flags' AMO_t */
	int IPI_nasid; /* nasid of where to send IPIs */
	int IPI_phys_cpuid; /* physical CPU ID of where to send IPIs */		int notify_IRQ_nasid; /* nasid of where to send notify IRQs */
			int notify_IRQ_phys_cpuid; /* CPUID of where to send notify IRQs */

	u8 nchannels; /* #of defined channels supported */		u8 nchannels; /* #of defined channels supported */

	@@ -407,7 +408,7 @@ struct xpc_channel {
	atomic_t n_on_msg_allocate_wq; /* #on msg allocation wait queue */		atomic_t n_on_msg_allocate_wq; /* #on msg allocation wait queue */
	wait_queue_head_t msg_allocate_wq; /* msg allocation wait queue */		wait_queue_head_t msg_allocate_wq; /* msg allocation wait queue */

	u8 delayed_IPI_flags; /* IPI flags received, but delayed */		u8 delayed_chctl_flags; /* chctl flags received, but delayed */
	/* action until channel disconnected */		/* action until channel disconnected */

	/* queue of msg senders who want to be notified when msg received */		/* queue of msg senders who want to be notified when msg received */
	@@ -469,6 +470,54 @@ struct xpc_channel {
	0x00020000 /* disconnecting callout completed */		0x00020000 /* disconnecting callout completed */
	#define XPC_C_WDISCONNECT 0x00040000 /* waiting for channel disconnect */		#define XPC_C_WDISCONNECT 0x00040000 /* waiting for channel disconnect */

			/*
			* The channel control flags (chctl) union consists of a 64-bit variable which
			* is divided up into eight bytes, ordered from right to left. Byte zero
			* pertains to channel 0, byte one to channel 1, and so on. Each channel's byte
			* can have one or more of the chctl flags set in it.
			*/

			union xpc_channel_ctl_flags {
			u64 all_flags;
			u8 flags[XPC_MAX_NCHANNELS];
			};

			/* chctl flags */
			#define XPC_CHCTL_CLOSEREQUEST 0x01
			#define XPC_CHCTL_CLOSEREPLY 0x02
			#define XPC_CHCTL_OPENREQUEST 0x04
			#define XPC_CHCTL_OPENREPLY 0x08
			#define XPC_CHCTL_MSGREQUEST 0x10

			#define XPC_OPENCLOSE_CHCTL_FLAGS \
			(XPC_CHCTL_CLOSEREQUEST \| XPC_CHCTL_CLOSEREPLY \| \
			XPC_CHCTL_OPENREQUEST \| XPC_CHCTL_OPENREPLY)
			#define XPC_MSG_CHCTL_FLAGS XPC_CHCTL_MSGREQUEST

			static inline int
			xpc_any_openclose_chctl_flags_set(union xpc_channel_ctl_flags *chctl)
			{
			int ch_number;

			for (ch_number = 0; ch_number < XPC_MAX_NCHANNELS; ch_number++) {
			if (chctl->flags[ch_number] & XPC_OPENCLOSE_CHCTL_FLAGS)
			return 1;
			}
			return 0;
			}

			static inline int
			xpc_any_msg_chctl_flags_set(union xpc_channel_ctl_flags *chctl)
			{
			int ch_number;

			for (ch_number = 0; ch_number < XPC_MAX_NCHANNELS; ch_number++) {
			if (chctl->flags[ch_number] & XPC_MSG_CHCTL_FLAGS)
			return 1;
			}
			return 0;
			}

	/*		/*
	* Manages channels on a partition basis. There is one of these structures		* Manages channels on a partition basis. There is one of these structures
	* for each partition (a partition will never utilize the structure that		* for each partition (a partition will never utilize the structure that
	@@ -494,12 +543,12 @@ struct xpc_partition_sn2 {

	u64 remote_openclose_args_pa; /* phys addr of remote's args */		u64 remote_openclose_args_pa; /* phys addr of remote's args */

	int remote_IPI_nasid; /* nasid of where to send IPIs */		int notify_IRQ_nasid; /* nasid of where to send notify IRQs */
	int remote_IPI_phys_cpuid; /* phys CPU ID of where to send IPIs */		int notify_IRQ_phys_cpuid; /* CPUID of where to send notify IRQs */
	char IPI_owner[8]; /* IPI owner's name */		char notify_IRQ_owner[8]; /* notify IRQ's owner's name */

	AMO_t remote_IPI_amo_va; / address of remote IPI AMO_t structure */		AMO_t remote_chctl_amo_va; / address of remote chctl flags' AMO_t */
	AMO_t local_IPI_amo_va; / address of IPI AMO_t structure */		AMO_t local_chctl_amo_va; / address of chctl flags' AMO_t */

	struct timer_list dropped_notify_IRQ_timer; /* dropped IRQ timer */		struct timer_list dropped_notify_IRQ_timer; /* dropped IRQ timer */
	};		};
	@@ -536,7 +585,10 @@ struct xpc_partition {
	atomic_t nchannels_engaged; /* #of channels engaged with remote part */		atomic_t nchannels_engaged; /* #of channels engaged with remote part */
	struct xpc_channel channels; / array of channel structures */		struct xpc_channel channels; / array of channel structures */

	/* fields used to pass args when opening or closing a channel */		/* fields used for managing channel avialability and activity */

			union xpc_channel_ctl_flags chctl; /* chctl flags yet to be processed */
			spinlock_t chctl_lock; /* chctl flags lock */

	void local_openclose_args_base; / base address of kmalloc'd space */		void local_openclose_args_base; / base address of kmalloc'd space */
	struct xpc_openclose_args local_openclose_args; / local's args */		struct xpc_openclose_args local_openclose_args; / local's args */
	@@ -544,11 +596,6 @@ struct xpc_partition {
	struct xpc_openclose_args remote_openclose_args; / copy of remote's */		struct xpc_openclose_args remote_openclose_args; / copy of remote's */
	/* args */		/* args */

	/* IPI sending, receiving and handling related fields */

	u64 local_IPI_amo; /* IPI amo flags yet to be handled */
	spinlock_t IPI_lock; /* IPI handler lock */

	/* channel manager related fields */		/* channel manager related fields */

	atomic_t channel_mgr_requests; /* #of requests to activate chan mgr */		atomic_t channel_mgr_requests; /* #of requests to activate chan mgr */
	@@ -580,11 +627,12 @@ struct xpc_partition {
	#define XPC_P_TORNDOWN 0x03 /* infrastructure is torndown */		#define XPC_P_TORNDOWN 0x03 /* infrastructure is torndown */

	/*		/*
	* struct xpc_partition IPI_timer #of seconds to wait before checking for		* struct xpc_partition_sn2's dropped notify IRQ timer is set to wait the
	* dropped IPIs. These occur whenever an IPI amo write doesn't complete until		* following interval #of seconds before checking for dropped notify IRQs.
	* after the IPI was received.		* These can occur whenever an IRQ's associated amo write doesn't complete
			* until after the IRQ was received.
	*/		*/
	#define XPC_P_DROPPED_IPI_WAIT_INTERVAL (0.25 * HZ)		#define XPC_DROPPED_NOTIFY_IRQ_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_DEFAULT_TIMELIMIT 90		#define XPC_DISENGAGE_DEFAULT_TIMELIMIT 90
	@@ -617,9 +665,9 @@ extern void (*xpc_offline_heartbeat) (void);
	extern void (*xpc_online_heartbeat) (void);		extern void (*xpc_online_heartbeat) (void);
	extern void (*xpc_check_remote_hb) (void);		extern void (*xpc_check_remote_hb) (void);
	extern enum xp_retval (xpc_make_first_contact) (struct xpc_partition );		extern enum xp_retval (xpc_make_first_contact) (struct xpc_partition );
	extern u64 (xpc_get_IPI_flags) (struct xpc_partition );		extern u64 (xpc_get_chctl_all_flags) (struct xpc_partition );
	extern void (xpc_notify_senders_of_disconnect) (struct xpc_channel );		extern void (xpc_notify_senders_of_disconnect) (struct xpc_channel );
	extern void (xpc_process_msg_IPI) (struct xpc_partition , int);		extern void (xpc_process_msg_chctl_flags) (struct xpc_partition , int);
	extern int (xpc_n_of_deliverable_msgs) (struct xpc_channel );		extern int (xpc_n_of_deliverable_msgs) (struct xpc_channel );
	extern struct xpc_msg (xpc_get_deliverable_msg) (struct xpc_channel *);		extern struct xpc_msg (xpc_get_deliverable_msg) (struct xpc_channel *);
	extern void (xpc_request_partition_activation) (struct xpc_rsvd_page , u64,		extern void (xpc_request_partition_activation) (struct xpc_rsvd_page , u64,
	@@ -638,14 +686,13 @@ extern int (*xpc_any_partition_engaged) (void);
	extern void (xpc_indicate_partition_disengaged) (struct xpc_partition );		extern void (xpc_indicate_partition_disengaged) (struct xpc_partition );
	extern void (*xpc_assume_partition_disengaged) (short);		extern void (*xpc_assume_partition_disengaged) (short);

	extern void (xpc_send_channel_closerequest) (struct xpc_channel ,		extern void (xpc_send_chctl_closerequest) (struct xpc_channel ,
	unsigned long *);		unsigned long *);
	extern void (xpc_send_channel_closereply) (struct xpc_channel ,		extern void (xpc_send_chctl_closereply) (struct xpc_channel ,
	unsigned long *);		unsigned long *);
	extern void (xpc_send_channel_openrequest) (struct xpc_channel ,		extern void (xpc_send_chctl_openrequest) (struct xpc_channel ,
	unsigned long *);
	extern void (xpc_send_channel_openreply) (struct xpc_channel ,
	unsigned long *);		unsigned long *);
			extern void (xpc_send_chctl_openreply) (struct xpc_channel , unsigned long *);

	extern enum xp_retval (xpc_send_msg) (struct xpc_channel , u32, void *, u16,		extern enum xp_retval (xpc_send_msg) (struct xpc_channel , u32, void *, u16,
	u8, xpc_notify_func, void *);		u8, xpc_notify_func, void *);
	@@ -689,7 +736,7 @@ extern enum xp_retval xpc_initiate_send(short, int, u32, void *, u16);
	extern enum xp_retval xpc_initiate_send_notify(short, int, u32, void *, u16,		extern enum xp_retval xpc_initiate_send_notify(short, int, u32, void *, u16,
	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 void xpc_process_channel_activity(struct xpc_partition *);		extern void xpc_process_sent_chctl_flags(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 *);
	extern void xpc_disconnect_channel(const int, struct xpc_channel *,		extern void xpc_disconnect_channel(const int, struct xpc_channel *,
	@@ -799,25 +846,4 @@ xpc_part_ref(struct xpc_partition *part)
	(_p)->reason_line = _line; \		(_p)->reason_line = _line; \
	}		}

	/*
	* The sending and receiving of IPIs includes the setting of an >>>AMO variable
	* to indicate the reason the IPI was sent. The 64-bit variable is divided
	* up into eight bytes, ordered from right to left. Byte zero pertains to
	* channel 0, byte one to channel 1, and so on. Each byte is described by
	* the following IPI flags.
	*/

	#define XPC_IPI_CLOSEREQUEST 0x01
	#define XPC_IPI_CLOSEREPLY 0x02
	#define XPC_IPI_OPENREQUEST 0x04
	#define XPC_IPI_OPENREPLY 0x08
	#define XPC_IPI_MSGREQUEST 0x10

	/* given an >>>AMO variable and a channel#, get its associated IPI flags */
	#define XPC_GET_IPI_FLAGS(_amo, _c) ((u8) (((_amo) >> ((_c) * 8)) & 0xff))
	#define XPC_SET_IPI_FLAGS(_amo, _c, _f) (_amo) \|= ((u64) (_f) << ((_c) * 8))

	#define XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(_amo) ((_amo) & 0x0f0f0f0f0f0f0f0fUL)
	#define XPC_ANY_MSG_IPI_FLAGS_SET(_amo) ((_amo) & 0x1010101010101010UL)

	#endif /* _DRIVERS_MISC_SGIXP_XPC_H */		#endif /* _DRIVERS_MISC_SGIXP_XPC_H */

drivers/misc/sgi-xp/xpc_channel.c

+66 −69

Original line number	Original line	Diff line number	Diff line
	@@ -201,7 +201,7 @@ xpc_process_connect(struct xpc_channel ch, unsigned long irq_flags)

	if (!(ch->flags & XPC_C_OPENREPLY)) {		if (!(ch->flags & XPC_C_OPENREPLY)) {
	ch->flags \|= XPC_C_OPENREPLY;		ch->flags \|= XPC_C_OPENREPLY;
	xpc_send_channel_openreply(ch, irq_flags);		xpc_send_chctl_openreply(ch, irq_flags);
	}		}

	if (!(ch->flags & XPC_C_ROPENREPLY))		if (!(ch->flags & XPC_C_ROPENREPLY))
	@@ -307,7 +307,7 @@ xpc_process_disconnect(struct xpc_channel ch, unsigned long irq_flags)

	if (!(ch->flags & XPC_C_CLOSEREPLY)) {		if (!(ch->flags & XPC_C_CLOSEREPLY)) {
	ch->flags \|= XPC_C_CLOSEREPLY;		ch->flags \|= XPC_C_CLOSEREPLY;
	xpc_send_channel_closereply(ch, irq_flags);		xpc_send_chctl_closereply(ch, irq_flags);
	}		}

	if (!(ch->flags & XPC_C_RCLOSEREPLY))		if (!(ch->flags & XPC_C_RCLOSEREPLY))
	@@ -344,15 +344,15 @@ xpc_process_disconnect(struct xpc_channel ch, unsigned long irq_flags)
	if (ch->flags & XPC_C_WDISCONNECT) {		if (ch->flags & XPC_C_WDISCONNECT) {
	/* we won't lose the CPU since we're holding ch->lock */		/* we won't lose the CPU since we're holding ch->lock */
	complete(&ch->wdisconnect_wait);		complete(&ch->wdisconnect_wait);
	} else if (ch->delayed_IPI_flags) {		} else if (ch->delayed_chctl_flags) {
	if (part->act_state != XPC_P_DEACTIVATING) {		if (part->act_state != XPC_P_DEACTIVATING) {
	/* time to take action on any delayed IPI flags */		/* time to take action on any delayed chctl flags */
	spin_lock(&part->IPI_lock);		spin_lock(&part->chctl_lock);
	XPC_SET_IPI_FLAGS(part->local_IPI_amo, ch->number,		part->chctl.flags[ch->number] \|=
	ch->delayed_IPI_flags);		ch->delayed_chctl_flags;
	spin_unlock(&part->IPI_lock);		spin_unlock(&part->chctl_lock);
	}		}
	ch->delayed_IPI_flags = 0;		ch->delayed_chctl_flags = 0;
	}		}
	}		}

	@@ -360,8 +360,8 @@ xpc_process_disconnect(struct xpc_channel ch, unsigned long irq_flags)
	* Process a change in the channel's remote connection state.		* Process a change in the channel's remote connection state.
	*/		*/
	static void		static void
	xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number,		xpc_process_openclose_chctl_flags(struct xpc_partition *part, int ch_number,
	u8 IPI_flags)		u8 chctl_flags)
	{		{
	unsigned long irq_flags;		unsigned long irq_flags;
	struct xpc_openclose_args *args =		struct xpc_openclose_args *args =
	@@ -376,24 +376,24 @@ xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number,
	if ((ch->flags & XPC_C_DISCONNECTED) &&		if ((ch->flags & XPC_C_DISCONNECTED) &&
	(ch->flags & XPC_C_WDISCONNECT)) {		(ch->flags & XPC_C_WDISCONNECT)) {
	/*		/*
	* Delay processing IPI flags until thread waiting disconnect		* Delay processing chctl flags until thread waiting disconnect
	* has had a chance to see that the channel is disconnected.		* has had a chance to see that the channel is disconnected.
	*/		*/
	ch->delayed_IPI_flags \|= IPI_flags;		ch->delayed_chctl_flags \|= chctl_flags;
	spin_unlock_irqrestore(&ch->lock, irq_flags);		spin_unlock_irqrestore(&ch->lock, irq_flags);
	return;		return;
	}		}

	if (IPI_flags & XPC_IPI_CLOSEREQUEST) {		if (chctl_flags & XPC_CHCTL_CLOSEREQUEST) {

	dev_dbg(xpc_chan, "XPC_IPI_CLOSEREQUEST (reason=%d) received "		dev_dbg(xpc_chan, "XPC_CHCTL_CLOSEREQUEST (reason=%d) received "
	"from partid=%d, channel=%d\n", args->reason,		"from partid=%d, channel=%d\n", args->reason,
	ch->partid, ch->number);		ch->partid, ch->number);

	/*		/*
	* If RCLOSEREQUEST is set, we're probably waiting for		* If RCLOSEREQUEST is set, we're probably waiting for
	* RCLOSEREPLY. We should find it and a ROPENREQUEST packed		* RCLOSEREPLY. We should find it and a ROPENREQUEST packed
	* with this RCLOSEREQUEST in the IPI_flags.		* with this RCLOSEREQUEST in the chctl_flags.
	*/		*/

	if (ch->flags & XPC_C_RCLOSEREQUEST) {		if (ch->flags & XPC_C_RCLOSEREQUEST) {
	@@ -402,8 +402,8 @@ xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number,
	DBUG_ON(!(ch->flags & XPC_C_CLOSEREPLY));		DBUG_ON(!(ch->flags & XPC_C_CLOSEREPLY));
	DBUG_ON(ch->flags & XPC_C_RCLOSEREPLY);		DBUG_ON(ch->flags & XPC_C_RCLOSEREPLY);

	DBUG_ON(!(IPI_flags & XPC_IPI_CLOSEREPLY));		DBUG_ON(!(chctl_flags & XPC_CHCTL_CLOSEREPLY));
	IPI_flags &= ~XPC_IPI_CLOSEREPLY;		chctl_flags &= ~XPC_CHCTL_CLOSEREPLY;
	ch->flags \|= XPC_C_RCLOSEREPLY;		ch->flags \|= XPC_C_RCLOSEREPLY;

	/* both sides have finished disconnecting */		/* both sides have finished disconnecting */
	@@ -413,17 +413,15 @@ xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number,
	}		}

	if (ch->flags & XPC_C_DISCONNECTED) {		if (ch->flags & XPC_C_DISCONNECTED) {
	if (!(IPI_flags & XPC_IPI_OPENREQUEST)) {		if (!(chctl_flags & XPC_CHCTL_OPENREQUEST)) {
	if ((XPC_GET_IPI_FLAGS(part->local_IPI_amo,		if (part->chctl.flags[ch_number] &
	ch_number) &		XPC_CHCTL_OPENREQUEST) {
	XPC_IPI_OPENREQUEST)) {
			DBUG_ON(ch->delayed_chctl_flags != 0);
	DBUG_ON(ch->delayed_IPI_flags != 0);		spin_lock(&part->chctl_lock);
	spin_lock(&part->IPI_lock);		part->chctl.flags[ch_number] \|=
	XPC_SET_IPI_FLAGS(part->local_IPI_amo,		XPC_CHCTL_CLOSEREQUEST;
	ch_number,		spin_unlock(&part->chctl_lock);
	XPC_IPI_CLOSEREQUEST);
	spin_unlock(&part->IPI_lock);
	}		}
	spin_unlock_irqrestore(&ch->lock, irq_flags);		spin_unlock_irqrestore(&ch->lock, irq_flags);
	return;		return;
	@@ -436,7 +434,7 @@ xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number,
	ch->flags \|= (XPC_C_CONNECTING \| XPC_C_ROPENREQUEST);		ch->flags \|= (XPC_C_CONNECTING \| XPC_C_ROPENREQUEST);
	}		}

	IPI_flags &= ~(XPC_IPI_OPENREQUEST \| XPC_IPI_OPENREPLY);		chctl_flags &= ~(XPC_CHCTL_OPENREQUEST \| XPC_CHCTL_OPENREPLY);

	/*		/*
	* The meaningful CLOSEREQUEST connection state fields are:		* The meaningful CLOSEREQUEST connection state fields are:
	@@ -454,7 +452,7 @@ xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number,

	XPC_DISCONNECT_CHANNEL(ch, reason, &irq_flags);		XPC_DISCONNECT_CHANNEL(ch, reason, &irq_flags);

	DBUG_ON(IPI_flags & XPC_IPI_CLOSEREPLY);		DBUG_ON(chctl_flags & XPC_CHCTL_CLOSEREPLY);
	spin_unlock_irqrestore(&ch->lock, irq_flags);		spin_unlock_irqrestore(&ch->lock, irq_flags);
	return;		return;
	}		}
	@@ -462,10 +460,10 @@ xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number,
	xpc_process_disconnect(ch, &irq_flags);		xpc_process_disconnect(ch, &irq_flags);
	}		}

	if (IPI_flags & XPC_IPI_CLOSEREPLY) {		if (chctl_flags & XPC_CHCTL_CLOSEREPLY) {

	dev_dbg(xpc_chan, "XPC_IPI_CLOSEREPLY received from partid=%d,"		dev_dbg(xpc_chan, "XPC_CHCTL_CLOSEREPLY received from partid="
	" channel=%d\n", ch->partid, ch->number);		"%d, channel=%d\n", ch->partid, ch->number);

	if (ch->flags & XPC_C_DISCONNECTED) {		if (ch->flags & XPC_C_DISCONNECTED) {
	DBUG_ON(part->act_state != XPC_P_DEACTIVATING);		DBUG_ON(part->act_state != XPC_P_DEACTIVATING);
	@@ -476,15 +474,14 @@ xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number,
	DBUG_ON(!(ch->flags & XPC_C_CLOSEREQUEST));		DBUG_ON(!(ch->flags & XPC_C_CLOSEREQUEST));

	if (!(ch->flags & XPC_C_RCLOSEREQUEST)) {		if (!(ch->flags & XPC_C_RCLOSEREQUEST)) {
	if ((XPC_GET_IPI_FLAGS(part->local_IPI_amo, ch_number)		if (part->chctl.flags[ch_number] &
	& XPC_IPI_CLOSEREQUEST)) {		XPC_CHCTL_CLOSEREQUEST) {

	DBUG_ON(ch->delayed_IPI_flags != 0);		DBUG_ON(ch->delayed_chctl_flags != 0);
	spin_lock(&part->IPI_lock);		spin_lock(&part->chctl_lock);
	XPC_SET_IPI_FLAGS(part->local_IPI_amo,		part->chctl.flags[ch_number] \|=
	ch_number,		XPC_CHCTL_CLOSEREPLY;
	XPC_IPI_CLOSEREPLY);		spin_unlock(&part->chctl_lock);
	spin_unlock(&part->IPI_lock);
	}		}
	spin_unlock_irqrestore(&ch->lock, irq_flags);		spin_unlock_irqrestore(&ch->lock, irq_flags);
	return;		return;
	@@ -498,9 +495,9 @@ xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number,
	}		}
	}		}

	if (IPI_flags & XPC_IPI_OPENREQUEST) {		if (chctl_flags & XPC_CHCTL_OPENREQUEST) {

	dev_dbg(xpc_chan, "XPC_IPI_OPENREQUEST (msg_size=%d, "		dev_dbg(xpc_chan, "XPC_CHCTL_OPENREQUEST (msg_size=%d, "
	"local_nentries=%d) received from partid=%d, "		"local_nentries=%d) received from partid=%d, "
	"channel=%d\n", args->msg_size, args->local_nentries,		"channel=%d\n", args->msg_size, args->local_nentries,
	ch->partid, ch->number);		ch->partid, ch->number);
	@@ -512,7 +509,7 @@ xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number,
	}		}

	if (ch->flags & (XPC_C_DISCONNECTING \| XPC_C_WDISCONNECT)) {		if (ch->flags & (XPC_C_DISCONNECTING \| XPC_C_WDISCONNECT)) {
	ch->delayed_IPI_flags \|= XPC_IPI_OPENREQUEST;		ch->delayed_chctl_flags \|= XPC_CHCTL_OPENREQUEST;
	spin_unlock_irqrestore(&ch->lock, irq_flags);		spin_unlock_irqrestore(&ch->lock, irq_flags);
	return;		return;
	}		}
	@@ -554,13 +551,13 @@ xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number,
	xpc_process_connect(ch, &irq_flags);		xpc_process_connect(ch, &irq_flags);
	}		}

	if (IPI_flags & XPC_IPI_OPENREPLY) {		if (chctl_flags & XPC_CHCTL_OPENREPLY) {

	dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY (local_msgqueue_pa=0x%lx, "		dev_dbg(xpc_chan, "XPC_CHCTL_OPENREPLY (local_msgqueue_pa="
	"local_nentries=%d, remote_nentries=%d) received from "		"0x%lx, local_nentries=%d, remote_nentries=%d) "
	"partid=%d, channel=%d\n", args->local_msgqueue_pa,		"received from partid=%d, channel=%d\n",
	args->local_nentries, args->remote_nentries,		args->local_msgqueue_pa, args->local_nentries,
	ch->partid, ch->number);		args->remote_nentries, ch->partid, ch->number);

	if (ch->flags & (XPC_C_DISCONNECTING \| XPC_C_DISCONNECTED)) {		if (ch->flags & (XPC_C_DISCONNECTING \| XPC_C_DISCONNECTED)) {
	spin_unlock_irqrestore(&ch->lock, irq_flags);		spin_unlock_irqrestore(&ch->lock, irq_flags);
	@@ -591,7 +588,7 @@ xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number,
	ch->remote_msgqueue_pa = args->local_msgqueue_pa;		ch->remote_msgqueue_pa = args->local_msgqueue_pa;

	if (args->local_nentries < ch->remote_nentries) {		if (args->local_nentries < ch->remote_nentries) {
	dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY: new "		dev_dbg(xpc_chan, "XPC_CHCTL_OPENREPLY: new "
	"remote_nentries=%d, old remote_nentries=%d, "		"remote_nentries=%d, old remote_nentries=%d, "
	"partid=%d, channel=%d\n",		"partid=%d, channel=%d\n",
	args->local_nentries, ch->remote_nentries,		args->local_nentries, ch->remote_nentries,
	@@ -600,7 +597,7 @@ xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number,
	ch->remote_nentries = args->local_nentries;		ch->remote_nentries = args->local_nentries;
	}		}
	if (args->remote_nentries < ch->local_nentries) {		if (args->remote_nentries < ch->local_nentries) {
	dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY: new "		dev_dbg(xpc_chan, "XPC_CHCTL_OPENREPLY: new "
	"local_nentries=%d, old local_nentries=%d, "		"local_nentries=%d, old local_nentries=%d, "
	"partid=%d, channel=%d\n",		"partid=%d, channel=%d\n",
	args->remote_nentries, ch->local_nentries,		args->remote_nentries, ch->local_nentries,
	@@ -690,7 +687,7 @@ xpc_connect_channel(struct xpc_channel *ch)
	/* initiate the connection */		/* initiate the connection */

	ch->flags \|= (XPC_C_OPENREQUEST \| XPC_C_CONNECTING);		ch->flags \|= (XPC_C_OPENREQUEST \| XPC_C_CONNECTING);
	xpc_send_channel_openrequest(ch, &irq_flags);		xpc_send_chctl_openrequest(ch, &irq_flags);

	xpc_process_connect(ch, &irq_flags);		xpc_process_connect(ch, &irq_flags);

	@@ -700,15 +697,15 @@ xpc_connect_channel(struct xpc_channel *ch)
	}		}

	void		void
	xpc_process_channel_activity(struct xpc_partition *part)		xpc_process_sent_chctl_flags(struct xpc_partition *part)
	{		{
	unsigned long irq_flags;		unsigned long irq_flags;
	u64 IPI_amo, IPI_flags;		union xpc_channel_ctl_flags chctl;
	struct xpc_channel *ch;		struct xpc_channel *ch;
	int ch_number;		int ch_number;
	u32 ch_flags;		u32 ch_flags;

	IPI_amo = xpc_get_IPI_flags(part);		chctl.all_flags = xpc_get_chctl_all_flags(part);

	/*		/*
	* Initiate channel connections for registered channels.		* Initiate channel connections for registered channels.
	@@ -721,14 +718,14 @@ xpc_process_channel_activity(struct xpc_partition *part)
	ch = &part->channels[ch_number];		ch = &part->channels[ch_number];

	/*		/*
	* Process any open or close related IPI flags, and then deal		* Process any open or close related chctl flags, and then deal
	* with connecting or disconnecting the channel as required.		* with connecting or disconnecting the channel as required.
	*/		*/

	IPI_flags = XPC_GET_IPI_FLAGS(IPI_amo, ch_number);		if (chctl.flags[ch_number] & XPC_OPENCLOSE_CHCTL_FLAGS) {
			xpc_process_openclose_chctl_flags(part, ch_number,
	if (XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(IPI_flags))		chctl.flags[ch_number]);
	xpc_process_openclose_IPI(part, ch_number, IPI_flags);		}

	ch_flags = ch->flags; /* need an atomic snapshot of flags */		ch_flags = ch->flags; /* need an atomic snapshot of flags */

	@@ -755,13 +752,13 @@ xpc_process_channel_activity(struct xpc_partition *part)
	}		}

	/*		/*
	* Process any message related IPI flags, this may involve the		* Process any message related chctl flags, this may involve
	* activation of kthreads to deliver any pending messages sent		* the activation of kthreads to deliver any pending messages
	* from the other partition.		* sent from the other partition.
	*/		*/

	if (XPC_ANY_MSG_IPI_FLAGS_SET(IPI_flags))		if (chctl.flags[ch_number] & XPC_MSG_CHCTL_FLAGS)
	xpc_process_msg_IPI(part, ch_number);		xpc_process_msg_chctl_flags(part, ch_number);
	}		}
	}		}

	@@ -937,7 +934,7 @@ xpc_disconnect_channel(const int line, struct xpc_channel *ch,
	XPC_C_ROPENREQUEST \| XPC_C_ROPENREPLY \|		XPC_C_ROPENREQUEST \| XPC_C_ROPENREPLY \|
	XPC_C_CONNECTING \| XPC_C_CONNECTED);		XPC_C_CONNECTING \| XPC_C_CONNECTED);

	xpc_send_channel_closerequest(ch, irq_flags);		xpc_send_chctl_closerequest(ch, irq_flags);

	if (channel_was_connected)		if (channel_was_connected)
	ch->flags \|= XPC_C_WASCONNECTED;		ch->flags \|= XPC_C_WASCONNECTED;

drivers/misc/sgi-xp/xpc_main.c

+29 −30

Original line number	Original line	Diff line number	Diff line
	@@ -25,18 +25,18 @@
	*		*
	* Caveats:		* Caveats:
	*		*
	* . We currently have no way to determine which nasid an IPI came		* . Currently on sn2, we have no way to determine which nasid an IRQ
	* from. Thus, >>> xpc_IPI_send() does a remote AMO write followed by		* came from. Thus, xpc_send_IRQ_sn2() does a remote AMO write
	* an IPI. The AMO indicates where data is to be pulled from, so		* followed by an IPI. The AMO indicates where data is to be pulled
	* after the IPI arrives, the remote partition checks the AMO word.		* from, so after the IPI arrives, the remote partition checks the AMO
	* The IPI can actually arrive before the AMO however, so other code		* word. The IPI can actually arrive before the AMO however, so other
	* must periodically check for this case. Also, remote AMO operations		* code must periodically check for this case. Also, remote AMO
	* do not reliably time out. Thus we do a remote PIO read solely to		* operations do not reliably time out. Thus we do a remote PIO read
	* know whether the remote partition is down and whether we should		* solely to know whether the remote partition is down and whether we
	* stop sending IPIs to it. This remote PIO read operation is set up		* should stop sending IPIs to it. This remote PIO read operation is
	* in a special nofault region so SAL knows to ignore (and cleanup)		* set up in a special nofault region so SAL knows to ignore (and
	* any errors due to the remote AMO write, PIO read, and/or PIO		* cleanup) any errors due to the remote AMO write, PIO read, and/or
	* write operations.		* PIO write operations.
	*		*
	* If/when new hardware solves this IPI problem, we should abandon		* If/when new hardware solves this IPI problem, we should abandon
	* the current approach.		* the current approach.
	@@ -185,8 +185,8 @@ void (*xpc_check_remote_hb) (void);

	enum xp_retval (xpc_make_first_contact) (struct xpc_partition part);		enum xp_retval (xpc_make_first_contact) (struct xpc_partition part);
	void (xpc_notify_senders_of_disconnect) (struct xpc_channel ch);		void (xpc_notify_senders_of_disconnect) (struct xpc_channel ch);
	u64 (xpc_get_IPI_flags) (struct xpc_partition part);		u64 (xpc_get_chctl_all_flags) (struct xpc_partition part);
	void (xpc_process_msg_IPI) (struct xpc_partition part, int ch_number);		void (xpc_process_msg_chctl_flags) (struct xpc_partition part, int ch_number);
	int (xpc_n_of_deliverable_msgs) (struct xpc_channel ch);		int (xpc_n_of_deliverable_msgs) (struct xpc_channel ch);
	struct xpc_msg (xpc_get_deliverable_msg) (struct xpc_channel *ch);		struct xpc_msg (xpc_get_deliverable_msg) (struct xpc_channel *ch);

	@@ -206,13 +206,13 @@ int (*xpc_any_partition_engaged) (void);
	void (xpc_indicate_partition_disengaged) (struct xpc_partition part);		void (xpc_indicate_partition_disengaged) (struct xpc_partition part);
	void (*xpc_assume_partition_disengaged) (short partid);		void (*xpc_assume_partition_disengaged) (short partid);

	void (xpc_send_channel_closerequest) (struct xpc_channel ch,		void (xpc_send_chctl_closerequest) (struct xpc_channel ch,
	unsigned long *irq_flags);		unsigned long *irq_flags);
	void (xpc_send_channel_closereply) (struct xpc_channel ch,		void (xpc_send_chctl_closereply) (struct xpc_channel ch,
	unsigned long *irq_flags);		unsigned long *irq_flags);
	void (xpc_send_channel_openrequest) (struct xpc_channel ch,		void (xpc_send_chctl_openrequest) (struct xpc_channel ch,
	unsigned long *irq_flags);		unsigned long *irq_flags);
	void (xpc_send_channel_openreply) (struct xpc_channel ch,		void (xpc_send_chctl_openreply) (struct xpc_channel ch,
	unsigned long *irq_flags);		unsigned long *irq_flags);

	enum xp_retval (xpc_send_msg) (struct xpc_channel ch, u32 flags,		enum xp_retval (xpc_send_msg) (struct xpc_channel ch, u32 flags,
	@@ -302,7 +302,7 @@ xpc_hb_checker(void *ignore)

	/*		/*
	* We need to periodically recheck to ensure no		* We need to periodically recheck to ensure no
	* IPI/AMO pairs have been missed. That check		* IRQ/AMO pairs have been missed. That check
	* must always reset xpc_hb_check_timeout.		* must always reset xpc_hb_check_timeout.
	*/		*/
	force_IRQ = 1;		force_IRQ = 1;
	@@ -378,7 +378,7 @@ xpc_channel_mgr(struct xpc_partition *part)
	atomic_read(&part->nchannels_active) > 0 \|\|		atomic_read(&part->nchannels_active) > 0 \|\|
	!xpc_partition_disengaged(part)) {		!xpc_partition_disengaged(part)) {

	xpc_process_channel_activity(part);		xpc_process_sent_chctl_flags(part);

	/*		/*
	* Wait until we've been requested to activate kthreads or		* Wait until we've been requested to activate kthreads or
	@@ -396,7 +396,7 @@ xpc_channel_mgr(struct xpc_partition *part)
	atomic_dec(&part->channel_mgr_requests);		atomic_dec(&part->channel_mgr_requests);
	(void)wait_event_interruptible(part->channel_mgr_wq,		(void)wait_event_interruptible(part->channel_mgr_wq,
	(atomic_read(&part->channel_mgr_requests) > 0 \|\|		(atomic_read(&part->channel_mgr_requests) > 0 \|\|
	part->local_IPI_amo != 0 \|\|		part->chctl.all_flags != 0 \|\|
	(part->act_state == XPC_P_DEACTIVATING &&		(part->act_state == XPC_P_DEACTIVATING &&
	atomic_read(&part->nchannels_active) == 0 &&		atomic_read(&part->nchannels_active) == 0 &&
	xpc_partition_disengaged(part))));		xpc_partition_disengaged(part))));
	@@ -753,16 +753,15 @@ xpc_disconnect_wait(int ch_number)
	DBUG_ON(!(ch->flags & XPC_C_DISCONNECTED));		DBUG_ON(!(ch->flags & XPC_C_DISCONNECTED));
	wakeup_channel_mgr = 0;		wakeup_channel_mgr = 0;

	if (ch->delayed_IPI_flags) {		if (ch->delayed_chctl_flags) {
	if (part->act_state != XPC_P_DEACTIVATING) {		if (part->act_state != XPC_P_DEACTIVATING) {
	spin_lock(&part->IPI_lock);		spin_lock(&part->chctl_lock);
	XPC_SET_IPI_FLAGS(part->local_IPI_amo,		part->chctl.flags[ch->number] \|=
	ch->number,		ch->delayed_chctl_flags;
	ch->delayed_IPI_flags);		spin_unlock(&part->chctl_lock);
	spin_unlock(&part->IPI_lock);
	wakeup_channel_mgr = 1;		wakeup_channel_mgr = 1;
	}		}
	ch->delayed_IPI_flags = 0;		ch->delayed_chctl_flags = 0;
	}		}

	ch->flags &= ~XPC_C_WDISCONNECT;		ch->flags &= ~XPC_C_WDISCONNECT;

drivers/misc/sgi-xp/xpc_sn2.c

+152 −149

File changed.

Preview size limit exceeded, changes collapsed.

drivers/misc/sgi-xp/xpc_uv.c

+5 −5

Original line number	Original line	Diff line number	Diff line
	@@ -26,7 +26,7 @@ static DECLARE_BITMAP(xpc_heartbeating_to_mask_uv, XP_MAX_NPARTITIONS_UV);
	static void *xpc_activate_mq;		static void *xpc_activate_mq;

	static void		static void
	xpc_IPI_send_local_activate_uv(struct xpc_partition *part)		xpc_send_local_activate_IRQ_uv(struct xpc_partition *part)
	{		{
	/*		/*
	* >>> make our side think that the remote parition sent an activate		* >>> make our side think that the remote parition sent an activate
	@@ -75,13 +75,13 @@ xpc_request_partition_activation_uv(struct xpc_rsvd_page *remote_rp,
	* >>> part->sn.uv.activate_mq_gpa = remote_rp->sn.activate_mq_gpa;		* >>> part->sn.uv.activate_mq_gpa = remote_rp->sn.activate_mq_gpa;
	*/		*/

	xpc_IPI_send_local_activate_uv(part);		xpc_send_local_activate_IRQ_uv(part);
	}		}

	static void		static void
	xpc_request_partition_reactivation_uv(struct xpc_partition *part)		xpc_request_partition_reactivation_uv(struct xpc_partition *part)
	{		{
	xpc_IPI_send_local_activate_uv(part);		xpc_send_local_activate_IRQ_uv(part);
	}		}

	/*		/*
	@@ -114,7 +114,7 @@ xpc_make_first_contact_uv(struct xpc_partition *part)
	}		}

	static u64		static u64
	xpc_get_IPI_flags_uv(struct xpc_partition *part)		xpc_get_chctl_all_flags_uv(struct xpc_partition *part)
	{		{
	/* >>> this function needs fleshing out */		/* >>> this function needs fleshing out */
	return 0UL;		return 0UL;
	@@ -140,7 +140,7 @@ xpc_init_uv(void)
	xpc_setup_infrastructure = xpc_setup_infrastructure_uv;		xpc_setup_infrastructure = xpc_setup_infrastructure_uv;
	xpc_teardown_infrastructure = xpc_teardown_infrastructure_uv;		xpc_teardown_infrastructure = xpc_teardown_infrastructure_uv;
	xpc_make_first_contact = xpc_make_first_contact_uv;		xpc_make_first_contact = xpc_make_first_contact_uv;
	xpc_get_IPI_flags = xpc_get_IPI_flags_uv;		xpc_get_chctl_all_flags = xpc_get_chctl_all_flags_uv;
	xpc_get_deliverable_msg = xpc_get_deliverable_msg_uv;		xpc_get_deliverable_msg = xpc_get_deliverable_msg_uv;
	}		}