Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * zfcp device driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Setup and helper functions to access QDIO.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Copyright IBM Corp. 2002, 2020
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #define KMSG_COMPONENT "zfcp"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include "zfcp_ext.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include "zfcp_qdio.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) static bool enable_multibuffer = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) module_param_named(datarouter, enable_multibuffer, bool, 0400);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) MODULE_PARM_DESC(datarouter, "Enable hardware data router support (default on)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) static void zfcp_qdio_handler_error(struct zfcp_qdio *qdio, char *dbftag,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 				    unsigned int qdio_err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	struct zfcp_adapter *adapter = qdio->adapter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	if (qdio_err & QDIO_ERROR_SLSB_STATE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 		zfcp_qdio_siosl(adapter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 		zfcp_erp_adapter_shutdown(adapter, 0, dbftag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	zfcp_erp_adapter_reopen(adapter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 				ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 				ZFCP_STATUS_COMMON_ERP_FAILED, dbftag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	int i, sbal_idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	for (i = first; i < first + cnt; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) /* this needs to be called prior to updating the queue fill level */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) static inline void zfcp_qdio_account(struct zfcp_qdio *qdio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	unsigned long long now, span;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	int used;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	now = get_tod_clock_monotonic();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	span = (now - qdio->req_q_time) >> 12;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	used = QDIO_MAX_BUFFERS_PER_Q - atomic_read(&qdio->req_q_free);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	qdio->req_q_util += used * span;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	qdio->req_q_time = now;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 			      int queue_no, int idx, int count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 			      unsigned long parm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	if (unlikely(qdio_err)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		zfcp_qdio_handler_error(qdio, "qdireq1", qdio_err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	/* cleanup all SBALs being program-owned now */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	spin_lock_irq(&qdio->stat_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	zfcp_qdio_account(qdio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	spin_unlock_irq(&qdio->stat_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	atomic_add(count, &qdio->req_q_free);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	wake_up(&qdio->req_q_wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 			       int queue_no, int idx, int count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 			       unsigned long parm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	struct zfcp_adapter *adapter = qdio->adapter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	int sbal_no, sbal_idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	if (unlikely(qdio_err)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		if (zfcp_adapter_multi_buffer_active(adapter)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 			void *pl[ZFCP_QDIO_MAX_SBALS_PER_REQ + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 			struct qdio_buffer_element *sbale;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 			u64 req_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 			u8 scount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 			memset(pl, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 			       ZFCP_QDIO_MAX_SBALS_PER_REQ * sizeof(void *));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 			sbale = qdio->res_q[idx]->element;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 			req_id = sbale->addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 			scount = min(sbale->scount + 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 				     ZFCP_QDIO_MAX_SBALS_PER_REQ + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 				     /* incl. signaling SBAL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 			for (sbal_no = 0; sbal_no < scount; sbal_no++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 				sbal_idx = (idx + sbal_no) %
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 					QDIO_MAX_BUFFERS_PER_Q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 				pl[sbal_no] = qdio->res_q[sbal_idx];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 			zfcp_dbf_hba_def_err(adapter, req_id, scount, pl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		zfcp_qdio_handler_error(qdio, "qdires1", qdio_err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	 * go through all SBALs from input queue currently
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	 * returned by QDIO layer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	for (sbal_no = 0; sbal_no < count; sbal_no++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		sbal_idx = (idx + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		/* go through all SBALEs of SBAL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		zfcp_fsf_reqid_check(qdio, sbal_idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	 * put SBALs back to response queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, idx, count))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdires2");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static struct qdio_buffer_element *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) zfcp_qdio_sbal_chain(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	struct qdio_buffer_element *sbale;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	/* set last entry flag in current SBALE of current SBAL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	sbale = zfcp_qdio_sbale_curr(qdio, q_req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	sbale->eflags |= SBAL_EFLAGS_LAST_ENTRY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	/* don't exceed last allowed SBAL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	if (q_req->sbal_last == q_req->sbal_limit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	/* set chaining flag in first SBALE of current SBAL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	sbale = zfcp_qdio_sbale_req(qdio, q_req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	sbale->sflags |= SBAL_SFLAGS0_MORE_SBALS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	/* calculate index of next SBAL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	q_req->sbal_last++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	q_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	/* keep this requests number of SBALs up-to-date */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	q_req->sbal_number++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	BUG_ON(q_req->sbal_number > ZFCP_QDIO_MAX_SBALS_PER_REQ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	/* start at first SBALE of new SBAL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	q_req->sbale_curr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	/* set storage-block type for new SBAL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	sbale = zfcp_qdio_sbale_curr(qdio, q_req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	sbale->sflags |= q_req->sbtype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	return sbale;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) static struct qdio_buffer_element *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) zfcp_qdio_sbale_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	if (q_req->sbale_curr == qdio->max_sbale_per_sbal - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		return zfcp_qdio_sbal_chain(qdio, q_req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	q_req->sbale_curr++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	return zfcp_qdio_sbale_curr(qdio, q_req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)  * zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)  * @qdio: pointer to struct zfcp_qdio
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)  * @q_req: pointer to struct zfcp_qdio_req
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)  * @sg: scatter-gather list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)  * Returns: zero or -EINVAL on error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 			    struct scatterlist *sg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	struct qdio_buffer_element *sbale;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	/* set storage-block type for this request */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	sbale = zfcp_qdio_sbale_req(qdio, q_req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	sbale->sflags |= q_req->sbtype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	for (; sg; sg = sg_next(sg)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		sbale = zfcp_qdio_sbale_next(qdio, q_req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		if (!sbale) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 			atomic_inc(&qdio->req_q_full);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 			zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 					     q_req->sbal_number);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		sbale->addr = sg_phys(sg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		sbale->length = sg->length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) static int zfcp_qdio_sbal_check(struct zfcp_qdio *qdio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	if (atomic_read(&qdio->req_q_free) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	    !(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)  * zfcp_qdio_sbal_get - get free sbal in request queue, wait if necessary
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)  * @qdio: pointer to struct zfcp_qdio
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)  * The req_q_lock must be held by the caller of this function, and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)  * this function may only be called from process context; it will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)  * sleep when waiting for a free sbal.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)  * Returns: 0 on success, -EIO if there is no free sbal after waiting.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) int zfcp_qdio_sbal_get(struct zfcp_qdio *qdio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	long ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	ret = wait_event_interruptible_lock_irq_timeout(qdio->req_q_wq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		       zfcp_qdio_sbal_check(qdio), qdio->req_q_lock, 5 * HZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	if (ret > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		atomic_inc(&qdio->req_q_full);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		/* assume hanging outbound queue, try queue recovery */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdsbg_1");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)  * zfcp_qdio_send - send req to QDIO
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)  * @qdio: pointer to struct zfcp_qdio
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)  * @q_req: pointer to struct zfcp_qdio_req
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)  * Returns: 0 on success, error otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) int zfcp_qdio_send(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	u8 sbal_number = q_req->sbal_number;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	spin_lock(&qdio->stat_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	zfcp_qdio_account(qdio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	spin_unlock(&qdio->stat_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	atomic_sub(sbal_number, &qdio->req_q_free);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	retval = do_QDIO(qdio->adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 			 q_req->sbal_first, sbal_number);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	if (unlikely(retval)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		/* Failed to submit the IO, roll back our modifications. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		atomic_add(sbal_number, &qdio->req_q_free);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 				     sbal_number);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	/* account for transferred buffers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	qdio->req_q_idx += sbal_number;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	qdio->req_q_idx %= QDIO_MAX_BUFFERS_PER_Q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)  * zfcp_qdio_allocate - allocate queue memory and initialize QDIO data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)  * @qdio: pointer to struct zfcp_qdio
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)  * Returns: -ENOMEM on memory allocation error or return value from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)  *          qdio_allocate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) static int zfcp_qdio_allocate(struct zfcp_qdio *qdio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	ret = qdio_alloc_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	ret = qdio_alloc_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		goto free_req_q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	init_waitqueue_head(&qdio->req_q_wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	ret = qdio_allocate(qdio->adapter->ccw_device, 1, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		goto free_res_q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) free_res_q:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	qdio_free_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) free_req_q:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	qdio_free_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)  * zfcp_close_qdio - close qdio queues for an adapter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)  * @qdio: pointer to structure zfcp_qdio
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) void zfcp_qdio_close(struct zfcp_qdio *qdio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	struct zfcp_adapter *adapter = qdio->adapter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	int idx, count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	/* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	spin_lock_irq(&qdio->req_q_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	atomic_andnot(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	spin_unlock_irq(&qdio->req_q_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	wake_up(&qdio->req_q_wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	/* cleanup used outbound sbals */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	count = atomic_read(&qdio->req_q_free);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	if (count < QDIO_MAX_BUFFERS_PER_Q) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		idx = (qdio->req_q_idx + count) % QDIO_MAX_BUFFERS_PER_Q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 		count = QDIO_MAX_BUFFERS_PER_Q - count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	qdio->req_q_idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	atomic_set(&qdio->req_q_free, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) void zfcp_qdio_shost_update(struct zfcp_adapter *const adapter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 			    const struct zfcp_qdio *const qdio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	struct Scsi_Host *const shost = adapter->scsi_host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	if (shost == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	shost->sg_tablesize = qdio->max_sbale_per_req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	shost->max_sectors = qdio->max_sbale_per_req * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)  * zfcp_qdio_open - prepare and initialize response queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)  * @qdio: pointer to struct zfcp_qdio
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)  * Returns: 0 on success, otherwise -EIO
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) int zfcp_qdio_open(struct zfcp_qdio *qdio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	struct qdio_buffer **input_sbals[1] = {qdio->res_q};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	struct qdio_buffer **output_sbals[1] = {qdio->req_q};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	struct qdio_buffer_element *sbale;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	struct qdio_initialize init_data = {0};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	struct zfcp_adapter *adapter = qdio->adapter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	struct ccw_device *cdev = adapter->ccw_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	struct qdio_ssqd_desc ssqd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	int cc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	atomic_andnot(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 			  &qdio->adapter->status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	init_data.q_format = QDIO_ZFCP_QFMT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	init_data.qib_rflags = QIB_RFLAGS_ENABLE_DATA_DIV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	if (enable_multibuffer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 		init_data.qdr_ac |= QDR_AC_MULTI_BUFFER_ENABLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 	init_data.no_input_qs = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	init_data.no_output_qs = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	init_data.input_handler = zfcp_qdio_int_resp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	init_data.output_handler = zfcp_qdio_int_req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	init_data.int_parm = (unsigned long) qdio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	init_data.input_sbal_addr_array = input_sbals;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	init_data.output_sbal_addr_array = output_sbals;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	init_data.scan_threshold =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 		QDIO_MAX_BUFFERS_PER_Q - ZFCP_QDIO_MAX_SBALS_PER_REQ * 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	if (qdio_establish(cdev, &init_data))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 		goto failed_establish;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 	if (qdio_get_ssqd_desc(cdev, &ssqd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 		goto failed_qdio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	if (ssqd.qdioac2 & CHSC_AC2_DATA_DIV_ENABLED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 		atomic_or(ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 				&qdio->adapter->status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	if (ssqd.qdioac2 & CHSC_AC2_MULTI_BUFFER_ENABLED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 		atomic_or(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 		qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 		atomic_andnot(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 		qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 	qdio->max_sbale_per_req =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 		ZFCP_QDIO_MAX_SBALS_PER_REQ * qdio->max_sbale_per_sbal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 		- 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 	if (qdio_activate(cdev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 		goto failed_qdio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 		sbale = &(qdio->res_q[cc]->element[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 		sbale->length = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 		sbale->eflags = SBAL_EFLAGS_LAST_ENTRY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 		sbale->sflags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 		sbale->addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 	if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, 0, QDIO_MAX_BUFFERS_PER_Q))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 		goto failed_qdio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 	/* set index of first available SBALS / number of available SBALS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 	qdio->req_q_idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 	atomic_set(&qdio->req_q_free, QDIO_MAX_BUFFERS_PER_Q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 	atomic_or(ZFCP_STATUS_ADAPTER_QDIOUP, &qdio->adapter->status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 	zfcp_qdio_shost_update(adapter, qdio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) failed_qdio:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 	qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) failed_establish:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 	dev_err(&cdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 		"Setting up the QDIO connection to the FCP adapter failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 	return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) void zfcp_qdio_destroy(struct zfcp_qdio *qdio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 	if (!qdio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) 	if (qdio->adapter->ccw_device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) 		qdio_free(qdio->adapter->ccw_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) 	qdio_free_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 	qdio_free_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) 	kfree(qdio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) int zfcp_qdio_setup(struct zfcp_adapter *adapter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) 	struct zfcp_qdio *qdio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) 	qdio = kzalloc(sizeof(struct zfcp_qdio), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) 	if (!qdio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) 	qdio->adapter = adapter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) 	if (zfcp_qdio_allocate(qdio)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) 		kfree(qdio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) 	spin_lock_init(&qdio->req_q_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) 	spin_lock_init(&qdio->stat_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) 	adapter->qdio = qdio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484)  * zfcp_qdio_siosl - Trigger logging in FCP channel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)  * @adapter: The zfcp_adapter where to trigger logging
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487)  * Call the cio siosl function to trigger hardware logging.  This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)  * wrapper function sets a flag to ensure hardware logging is only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489)  * triggered once before going through qdio shutdown.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491)  * The triggers are always run from qdio tasklet context, so no
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)  * additional synchronization is necessary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) void zfcp_qdio_siosl(struct zfcp_adapter *adapter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) 	int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) 	if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_SIOSL_ISSUED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) 	rc = ccw_device_siosl(adapter->ccw_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) 	if (!rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) 		atomic_or(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) 				&adapter->status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) }