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-rw-r--r--drivers/s390/cio/qdio.h349
1 files changed, 349 insertions, 0 deletions
diff --git a/drivers/s390/cio/qdio.h b/drivers/s390/cio/qdio.h
new file mode 100644
index 000000000..641f0dbb6
--- /dev/null
+++ b/drivers/s390/cio/qdio.h
@@ -0,0 +1,349 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * 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 */
+
+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_WRITEM 0x03
+#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)
+{
+ unsigned long _queuestart = ((unsigned long)queue << 32) | *start;
+ unsigned long _ccq = *count;
+
+ asm volatile(
+ " lgr 1,%[token]\n"
+ " .insn rsy,0xeb000000008a,%[qs],%[ccq],0(%[state])"
+ : [ccq] "+&d" (_ccq), [qs] "+&d" (_queuestart)
+ : [state] "a" ((unsigned long)state), [token] "d" (token)
+ : "memory", "cc", "1");
+ *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)
+{
+ unsigned long _queuestart = ((unsigned long)queue << 32) | *start;
+ unsigned long _state = (unsigned long)ack << 63;
+ unsigned long _ccq = *count;
+
+ asm volatile(
+ " lgr 1,%[token]\n"
+ " .insn rrf,0xb99c0000,%[qs],%[state],%[ccq],0"
+ : [ccq] "+&d" (_ccq), [qs] "+&d" (_queuestart),
+ [state] "+&d" (_state)
+ : [token] "d" (token)
+ : "memory", "cc", "1");
+ *count = _ccq & 0xff;
+ *start = _queuestart & 0xff;
+ *state = _state & 0xff;
+
+ return (_ccq >> 32) & 0xff;
+}
+
+struct qdio_irq;
+
+struct qdio_dev_perf_stat {
+ unsigned int adapter_int;
+ unsigned int qdio_int;
+
+ unsigned int siga_read;
+ unsigned int siga_write;
+ unsigned int siga_sync;
+
+ unsigned int inbound_call;
+ unsigned int stop_polling;
+ unsigned int inbound_queue_full;
+ unsigned int outbound_call;
+ 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. */
+ unsigned int nr_sbals[8];
+ unsigned int nr_sbal_error;
+ unsigned int nr_sbal_nop;
+ unsigned int nr_sbal_total;
+};
+
+enum qdio_irq_poll_states {
+ QDIO_IRQ_DISABLED,
+};
+
+struct qdio_input_q {
+ /* Batch of SBALs that we processed while polling the queue: */
+ unsigned int batch_start;
+ unsigned int batch_count;
+};
+
+struct qdio_output_q {
+};
+
+/*
+ * 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;
+
+ /* number of buffers in use by the adapter */
+ atomic_t nr_buf_used;
+
+ /* last scan of the queue */
+ u64 timestamp;
+
+ 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;
+
+ /* upper-layer program handler */
+ qdio_handler_t (*handler);
+
+ 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 list_head entry; /* list of thinint devices */
+ struct dentry *debugfs_dev;
+ u64 last_data_irq_time;
+
+ unsigned long int_parm;
+ struct subchannel_id schid;
+ unsigned long sch_token; /* QEBSM facility */
+
+ enum qdio_irq_states state;
+ u8 qdioac1;
+
+ int nr_input_qs;
+ int nr_output_qs;
+
+ struct ccw1 *ccw;
+
+ struct qdio_ssqd_desc ssqd_desc;
+ void (*orig_handler) (struct ccw_device *, unsigned long, struct irb *);
+ qdio_handler_t (*error_handler);
+
+ 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];
+ unsigned int max_input_qs;
+ unsigned int max_output_qs;
+
+ void (*irq_poll)(struct ccw_device *cdev, unsigned long data);
+ unsigned long poll_state;
+
+ 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 QDIO_PERF_STAT_INC(__irq, __attr) \
+({ \
+ struct qdio_irq *qdev = __irq; \
+ if (qdev->perf_stat_enabled) \
+ (qdev->perf_stat.__attr)++; \
+})
+
+#define qperf_inc(__q, __attr) QDIO_PERF_STAT_INC((__q)->irq_ptr, __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);
+}
+
+static inline void qdio_deliver_irq(struct qdio_irq *irq)
+{
+ if (!test_and_set_bit(QDIO_IRQ_DISABLED, &irq->poll_state))
+ irq->irq_poll(irq->cdev, irq->int_parm);
+ else
+ QDIO_PERF_STAT_INC(irq, int_discarded);
+}
+
+#define pci_out_supported(irq) ((irq)->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)
+#define is_qebsm(q) (q->irq_ptr->sch_token != 0)
+
+#define qdio_need_siga_in(irq) ((irq)->qdioac1 & AC1_SIGA_INPUT_NEEDED)
+#define qdio_need_siga_out(irq) ((irq)->qdioac1 & AC1_SIGA_OUTPUT_NEEDED)
+#define qdio_need_siga_sync(irq) (unlikely((irq)->qdioac1 & AC1_SIGA_SYNC_NEEDED))
+
+#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 add_buf(bufnr, inc) QDIO_BUFNR((bufnr) + (inc))
+#define next_buf(bufnr) add_buf(bufnr, 1)
+#define sub_buf(bufnr, dec) QDIO_BUFNR((bufnr) - (dec))
+#define prev_buf(bufnr) sub_buf(bufnr, 1)
+
+extern u64 last_ai_time;
+
+/* prototypes for thin interrupt */
+int qdio_establish_thinint(struct qdio_irq *irq_ptr);
+void qdio_shutdown_thinint(struct qdio_irq *irq_ptr);
+int qdio_thinint_init(void);
+void qdio_thinint_exit(void);
+int test_nonshared_ind(struct qdio_irq *);
+
+/* prototypes for setup */
+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);
+void qdio_setup_irq(struct qdio_irq *irq_ptr, struct qdio_initialize *init_data);
+void qdio_shutdown_irq(struct qdio_irq *irq);
+void qdio_print_subchannel_info(struct qdio_irq *irq_ptr);
+void qdio_free_queues(struct qdio_irq *irq_ptr);
+int qdio_setup_init(void);
+void qdio_setup_exit(void);
+
+int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
+ unsigned char *state);
+#endif /* _CIO_QDIO_H */