Initial import

1 files changed, 418 insertions, 0 deletions

diff --git a/drivers/s390/cio/qdio.h b/drivers/s390/cio/qdio.h
new file mode 100644
index 000000000..7e70f9298
--- /dev/null
+++ b/drivers/s390/cio/qdio.h
@@ -0,0 +1,418 @@
+/*
+ * Copyright IBM Corp. 2000, 2009
+ * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
+ *	      Jan Glauber <jang@linux.vnet.ibm.com>
+ */
+#ifndef _CIO_QDIO_H
+#define _CIO_QDIO_H
+
+#include <asm/page.h>
+#include <asm/schid.h>
+#include <asm/debug.h>
+#include "chsc.h"
+
+#define QDIO_BUSY_BIT_PATIENCE		(100 << 12)	/* 100 microseconds */
+#define QDIO_BUSY_BIT_RETRY_DELAY	10		/* 10 milliseconds */
+#define QDIO_BUSY_BIT_RETRIES		1000		/* = 10s retry time */
+#define QDIO_INPUT_THRESHOLD		(500 << 12)	/* 500 microseconds */
+
+enum qdio_irq_states {
+	QDIO_IRQ_STATE_INACTIVE,
+	QDIO_IRQ_STATE_ESTABLISHED,
+	QDIO_IRQ_STATE_ACTIVE,
+	QDIO_IRQ_STATE_STOPPED,
+	QDIO_IRQ_STATE_CLEANUP,
+	QDIO_IRQ_STATE_ERR,
+	NR_QDIO_IRQ_STATES,
+};
+
+/* used as intparm in do_IO */
+#define QDIO_DOING_ESTABLISH	1
+#define QDIO_DOING_ACTIVATE	2
+#define QDIO_DOING_CLEANUP	3
+
+#define SLSB_STATE_NOT_INIT	0x0
+#define SLSB_STATE_EMPTY	0x1
+#define SLSB_STATE_PRIMED	0x2
+#define SLSB_STATE_PENDING	0x3
+#define SLSB_STATE_HALTED	0xe
+#define SLSB_STATE_ERROR	0xf
+#define SLSB_TYPE_INPUT		0x0
+#define SLSB_TYPE_OUTPUT	0x20
+#define SLSB_OWNER_PROG		0x80
+#define SLSB_OWNER_CU		0x40
+
+#define SLSB_P_INPUT_NOT_INIT	\
+	(SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_NOT_INIT)  /* 0x80 */
+#define SLSB_P_INPUT_ACK	\
+	(SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_EMPTY)	   /* 0x81 */
+#define SLSB_CU_INPUT_EMPTY	\
+	(SLSB_OWNER_CU | SLSB_TYPE_INPUT | SLSB_STATE_EMPTY)	   /* 0x41 */
+#define SLSB_P_INPUT_PRIMED	\
+	(SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_PRIMED)	   /* 0x82 */
+#define SLSB_P_INPUT_HALTED	\
+	(SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_HALTED)	   /* 0x8e */
+#define SLSB_P_INPUT_ERROR	\
+	(SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_ERROR)	   /* 0x8f */
+#define SLSB_P_OUTPUT_NOT_INIT	\
+	(SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_NOT_INIT) /* 0xa0 */
+#define SLSB_P_OUTPUT_EMPTY	\
+	(SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_EMPTY)	   /* 0xa1 */
+#define SLSB_P_OUTPUT_PENDING \
+	(SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_PENDING)  /* 0xa3 */
+#define SLSB_CU_OUTPUT_PRIMED	\
+	(SLSB_OWNER_CU | SLSB_TYPE_OUTPUT | SLSB_STATE_PRIMED)	   /* 0x62 */
+#define SLSB_P_OUTPUT_HALTED	\
+	(SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_HALTED)   /* 0xae */
+#define SLSB_P_OUTPUT_ERROR	\
+	(SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_ERROR)	   /* 0xaf */
+
+#define SLSB_ERROR_DURING_LOOKUP  0xff
+
+/* additional CIWs returned by extended Sense-ID */
+#define CIW_TYPE_EQUEUE			0x3 /* establish QDIO queues */
+#define CIW_TYPE_AQUEUE			0x4 /* activate QDIO queues */
+
+/* flags for st qdio sch data */
+#define CHSC_FLAG_QDIO_CAPABILITY	0x80
+#define CHSC_FLAG_VALIDITY		0x40
+
+/* SIGA flags */
+#define QDIO_SIGA_WRITE		0x00
+#define QDIO_SIGA_READ		0x01
+#define QDIO_SIGA_SYNC		0x02
+#define QDIO_SIGA_WRITEQ	0x04
+#define QDIO_SIGA_QEBSM_FLAG	0x80
+
+static inline int do_sqbs(u64 token, unsigned char state, int queue,
+			  int *start, int *count)
+{
+	register unsigned long _ccq asm ("0") = *count;
+	register unsigned long _token asm ("1") = token;
+	unsigned long _queuestart = ((unsigned long)queue << 32) | *start;
+
+	asm volatile(
+		"	.insn	rsy,0xeb000000008A,%1,0,0(%2)"
+		: "+d" (_ccq), "+d" (_queuestart)
+		: "d" ((unsigned long)state), "d" (_token)
+		: "memory", "cc");
+	*count = _ccq & 0xff;
+	*start = _queuestart & 0xff;
+
+	return (_ccq >> 32) & 0xff;
+}
+
+static inline int do_eqbs(u64 token, unsigned char *state, int queue,
+			  int *start, int *count, int ack)
+{
+	register unsigned long _ccq asm ("0") = *count;
+	register unsigned long _token asm ("1") = token;
+	unsigned long _queuestart = ((unsigned long)queue << 32) | *start;
+	unsigned long _state = (unsigned long)ack << 63;
+
+	asm volatile(
+		"	.insn	rrf,0xB99c0000,%1,%2,0,0"
+		: "+d" (_ccq), "+d" (_queuestart), "+d" (_state)
+		: "d" (_token)
+		: "memory", "cc");
+	*count = _ccq & 0xff;
+	*start = _queuestart & 0xff;
+	*state = _state & 0xff;
+
+	return (_ccq >> 32) & 0xff;
+}
+
+struct qdio_irq;
+
+struct siga_flag {
+	u8 input:1;
+	u8 output:1;
+	u8 sync:1;
+	u8 sync_after_ai:1;
+	u8 sync_out_after_pci:1;
+	u8:3;
+} __attribute__ ((packed));
+
+struct qdio_dev_perf_stat {
+	unsigned int adapter_int;
+	unsigned int qdio_int;
+	unsigned int pci_request_int;
+
+	unsigned int tasklet_inbound;
+	unsigned int tasklet_inbound_resched;
+	unsigned int tasklet_inbound_resched2;
+	unsigned int tasklet_outbound;
+
+	unsigned int siga_read;
+	unsigned int siga_write;
+	unsigned int siga_sync;
+
+	unsigned int inbound_call;
+	unsigned int inbound_handler;
+	unsigned int stop_polling;
+	unsigned int inbound_queue_full;
+	unsigned int outbound_call;
+	unsigned int outbound_handler;
+	unsigned int outbound_queue_full;
+	unsigned int fast_requeue;
+	unsigned int target_full;
+	unsigned int eqbs;
+	unsigned int eqbs_partial;
+	unsigned int sqbs;
+	unsigned int sqbs_partial;
+	unsigned int int_discarded;
+} ____cacheline_aligned;
+
+struct qdio_queue_perf_stat {
+	/*
+	 * Sorted into order-2 buckets: 1, 2-3, 4-7, ... 64-127, 128.
+	 * Since max. 127 SBALs are scanned reuse entry for 128 as queue full
+	 * aka 127 SBALs found.
+	 */
+	unsigned int nr_sbals[8];
+	unsigned int nr_sbal_error;
+	unsigned int nr_sbal_nop;
+	unsigned int nr_sbal_total;
+};
+
+enum qdio_queue_irq_states {
+	QDIO_QUEUE_IRQS_DISABLED,
+};
+
+struct qdio_input_q {
+	/* input buffer acknowledgement flag */
+	int polling;
+	/* first ACK'ed buffer */
+	int ack_start;
+	/* how much sbals are acknowledged with qebsm */
+	int ack_count;
+	/* last time of noticing incoming data */
+	u64 timestamp;
+	/* upper-layer polling flag */
+	unsigned long queue_irq_state;
+	/* callback to start upper-layer polling */
+	void (*queue_start_poll) (struct ccw_device *, int, unsigned long);
+};
+
+struct qdio_output_q {
+	/* PCIs are enabled for the queue */
+	int pci_out_enabled;
+	/* cq: use asynchronous output buffers */
+	int use_cq;
+	/* cq: aobs used for particual SBAL */
+	struct qaob **aobs;
+	/* cq: sbal state related to asynchronous operation */
+	struct qdio_outbuf_state *sbal_state;
+	/* timer to check for more outbound work */
+	struct timer_list timer;
+	/* used SBALs before tasklet schedule */
+	int scan_threshold;
+};
+
+/*
+ * Note on cache alignment: grouped slsb and write mostly data at the beginning
+ * sbal[] is read-only and starts on a new cacheline followed by read mostly.
+ */
+struct qdio_q {
+	struct slsb slsb;
+
+	union {
+		struct qdio_input_q in;
+		struct qdio_output_q out;
+	} u;
+
+	/*
+	 * inbound: next buffer the program should check for
+	 * outbound: next buffer to check if adapter processed it
+	 */
+	int first_to_check;
+
+	/* first_to_check of the last time */
+	int last_move;
+
+	/* beginning position for calling the program */
+	int first_to_kick;
+
+	/* number of buffers in use by the adapter */
+	atomic_t nr_buf_used;
+
+	/* error condition during a data transfer */
+	unsigned int qdio_error;
+
+	/* last scan of the queue */
+	u64 timestamp;
+
+	struct tasklet_struct tasklet;
+	struct qdio_queue_perf_stat q_stats;
+
+	struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q] ____cacheline_aligned;
+
+	/* queue number */
+	int nr;
+
+	/* bitmask of queue number */
+	int mask;
+
+	/* input or output queue */
+	int is_input_q;
+
+	/* list of thinint input queues */
+	struct list_head entry;
+
+	/* upper-layer program handler */
+	qdio_handler_t (*handler);
+
+	struct dentry *debugfs_q;
+	struct qdio_irq *irq_ptr;
+	struct sl *sl;
+	/*
+	 * A page is allocated under this pointer and used for slib and sl.
+	 * slib is 2048 bytes big and sl points to offset PAGE_SIZE / 2.
+	 */
+	struct slib *slib;
+} __attribute__ ((aligned(256)));
+
+struct qdio_irq {
+	struct qib qib;
+	u32 *dsci;		/* address of device state change indicator */
+	struct ccw_device *cdev;
+	struct dentry *debugfs_dev;
+	struct dentry *debugfs_perf;
+
+	unsigned long int_parm;
+	struct subchannel_id schid;
+	unsigned long sch_token;	/* QEBSM facility */
+
+	enum qdio_irq_states state;
+
+	struct siga_flag siga_flag;	/* siga sync information from qdioac */
+
+	int nr_input_qs;
+	int nr_output_qs;
+
+	struct ccw1 ccw;
+	struct ciw equeue;
+	struct ciw aqueue;
+
+	struct qdio_ssqd_desc ssqd_desc;
+	void (*orig_handler) (struct ccw_device *, unsigned long, struct irb *);
+
+	int perf_stat_enabled;
+
+	struct qdr *qdr;
+	unsigned long chsc_page;
+
+	struct qdio_q *input_qs[QDIO_MAX_QUEUES_PER_IRQ];
+	struct qdio_q *output_qs[QDIO_MAX_QUEUES_PER_IRQ];
+
+	debug_info_t *debug_area;
+	struct mutex setup_mutex;
+	struct qdio_dev_perf_stat perf_stat;
+};
+
+/* helper functions */
+#define queue_type(q)	q->irq_ptr->qib.qfmt
+#define SCH_NO(q)	(q->irq_ptr->schid.sch_no)
+
+#define is_thinint_irq(irq) \
+	(irq->qib.qfmt == QDIO_IQDIO_QFMT || \
+	 css_general_characteristics.aif_osa)
+
+#define qperf(__qdev, __attr)	((__qdev)->perf_stat.(__attr))
+
+#define qperf_inc(__q, __attr)						\
+({									\
+	struct qdio_irq *qdev = (__q)->irq_ptr;				\
+	if (qdev->perf_stat_enabled)					\
+		(qdev->perf_stat.__attr)++;				\
+})
+
+static inline void account_sbals_error(struct qdio_q *q, int count)
+{
+	q->q_stats.nr_sbal_error += count;
+	q->q_stats.nr_sbal_total += count;
+}
+
+/* the highest iqdio queue is used for multicast */
+static inline int multicast_outbound(struct qdio_q *q)
+{
+	return (q->irq_ptr->nr_output_qs > 1) &&
+	       (q->nr == q->irq_ptr->nr_output_qs - 1);
+}
+
+#define pci_out_supported(q) \
+	(q->irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)
+#define is_qebsm(q)			(q->irq_ptr->sch_token != 0)
+
+#define need_siga_in(q)			(q->irq_ptr->siga_flag.input)
+#define need_siga_out(q)		(q->irq_ptr->siga_flag.output)
+#define need_siga_sync(q)		(unlikely(q->irq_ptr->siga_flag.sync))
+#define need_siga_sync_after_ai(q)	\
+	(unlikely(q->irq_ptr->siga_flag.sync_after_ai))
+#define need_siga_sync_out_after_pci(q)	\
+	(unlikely(q->irq_ptr->siga_flag.sync_out_after_pci))
+
+#define for_each_input_queue(irq_ptr, q, i)		\
+	for (i = 0; i < irq_ptr->nr_input_qs &&		\
+		({ q = irq_ptr->input_qs[i]; 1; }); i++)
+#define for_each_output_queue(irq_ptr, q, i)		\
+	for (i = 0; i < irq_ptr->nr_output_qs &&	\
+		({ q = irq_ptr->output_qs[i]; 1; }); i++)
+
+#define prev_buf(bufnr)	\
+	((bufnr + QDIO_MAX_BUFFERS_MASK) & QDIO_MAX_BUFFERS_MASK)
+#define next_buf(bufnr)	\
+	((bufnr + 1) & QDIO_MAX_BUFFERS_MASK)
+#define add_buf(bufnr, inc) \
+	((bufnr + inc) & QDIO_MAX_BUFFERS_MASK)
+#define sub_buf(bufnr, dec) \
+	((bufnr - dec) & QDIO_MAX_BUFFERS_MASK)
+
+#define queue_irqs_enabled(q)			\
+	(test_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state) == 0)
+#define queue_irqs_disabled(q)			\
+	(test_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state) != 0)
+
+extern u64 last_ai_time;
+
+/* prototypes for thin interrupt */
+void qdio_setup_thinint(struct qdio_irq *irq_ptr);
+int qdio_establish_thinint(struct qdio_irq *irq_ptr);
+void qdio_shutdown_thinint(struct qdio_irq *irq_ptr);
+void tiqdio_add_input_queues(struct qdio_irq *irq_ptr);
+void tiqdio_remove_input_queues(struct qdio_irq *irq_ptr);
+void tiqdio_inbound_processing(unsigned long q);
+int tiqdio_allocate_memory(void);
+void tiqdio_free_memory(void);
+int tiqdio_register_thinints(void);
+void tiqdio_unregister_thinints(void);
+void clear_nonshared_ind(struct qdio_irq *);
+int test_nonshared_ind(struct qdio_irq *);
+
+/* prototypes for setup */
+void qdio_inbound_processing(unsigned long data);
+void qdio_outbound_processing(unsigned long data);
+void qdio_outbound_timer(unsigned long data);
+void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
+		      struct irb *irb);
+int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs,
+		     int nr_output_qs);
+void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr);
+int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
+			struct subchannel_id *schid,
+			struct qdio_ssqd_desc *data);
+int qdio_setup_irq(struct qdio_initialize *init_data);
+void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
+				struct ccw_device *cdev);
+void qdio_release_memory(struct qdio_irq *irq_ptr);
+int qdio_setup_create_sysfs(struct ccw_device *cdev);
+void qdio_setup_destroy_sysfs(struct ccw_device *cdev);
+int qdio_setup_init(void);
+void qdio_setup_exit(void);
+int qdio_enable_async_operation(struct qdio_output_q *q);
+void qdio_disable_async_operation(struct qdio_output_q *q);
+struct qaob *qdio_allocate_aob(void);
+
+int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
+			unsigned char *state);
+#endif /* _CIO_QDIO_H */