Subject: [PATCH 09/16] ehca: event queue

From: Heiko J Schick <[email-masked]>
Date: Mon, 15 May 2006 19:42:22 +0200

Signed-off-by: Heiko J Schick <[email-masked]>

  drivers/infiniband/hw/ehca/ehca_eq.c |  222 +++++++++++++++++++++++++++++++++++
  1 file changed, 222 insertions(+)

--- linux-2.6.17-rc2-orig/drivers/infiniband/hw/ehca/ehca_eq.c	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.17-rc2/drivers/infiniband/hw/ehca/ehca_eq.c	2006-05-15 13:29:49.000000000 +0200
@@ -0,0 +1,222 @@
+/*
+ *  IBM eServer eHCA Infiniband device driver for Linux on POWER
+ *
+ *  Event queue handling
+ *
+ *  Authors: Waleri Fomin <[email-masked]>
+ *           Khadija Souissi <[email-masked]>
+ *           Reinhard Ernst <[email-masked]>
+ *           Heiko J Schick <[email-masked]>
+ *           Hoang-Nam Nguyen <[email-masked]>
+ *
+ *
+ *  Copyright (c) 2005 IBM Corporation
+ *
+ *  All rights reserved.
+ *
+ *  This source code is distributed under a dual license of GPL v2.0 and OpenIB
+ *  BSD.
+ *
+ * OpenIB BSD License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials
+ * provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+ * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#define DEB_PREFIX "e_eq"
+
+#include "ehca_classes.h"
+#include "ehca_irq.h"
+#include "ehca_iverbs.h"
+#include "ehca_qes.h"
+#include "hcp_if.h"
+#include "ipz_pt_fn.h"
+
+int ehca_create_eq(struct ehca_shca *shca,
+		   struct ehca_eq *eq,
+		   const enum ehca_eq_type type, const u32 length)
+{
+	u64 ret = H_SUCCESS;
+	u32 nr_pages = 0;
+	u32 i;
+	void *vpage = NULL;
+
+	EDEB_EN(7, "shca=%p eq=%p length=%x", shca, eq, length);
+	EHCA_CHECK_ADR(shca);
+	EHCA_CHECK_ADR(eq);
+
+	spin_lock_init(&eq->spinlock);
+	eq->is_initialized = 0;
+
+	if (type != EHCA_EQ && type != EHCA_NEQ) {
+		EDEB_ERR(4, "Invalid EQ type %x. eq=%p", type, eq);
+		return -EINVAL;
+	}
+	if (length == 0) {
+		EDEB_ERR(4, "EQ length must not be zero. eq=%p", eq);
+		return -EINVAL;
+	}
+
+	ret = hipz_h_alloc_resource_eq(shca->ipz_hca_handle,
+				       &eq->pf,
+				       type,
+				       length,
+				       &eq->ipz_eq_handle,
+				       &eq->length,
+				       &nr_pages, &eq->ist);
+
+	if (ret != H_SUCCESS) {
+		EDEB_ERR(4, "Can't allocate EQ / NEQ. eq=%p", eq);
+		return -EINVAL;
+	}
+
+	ret = ipz_queue_ctor(&eq->ipz_queue, nr_pages,
+			     EHCA_PAGESIZE, sizeof(struct ehca_eqe), 0);
+	if (!ret) {
+		EDEB_ERR(4, "Can't allocate EQ pages. eq=%p", eq);
+		goto create_eq_exit1;
+	}
+
+	for (i = 0; i < nr_pages; i++) {
+		u64 rpage;
+
+		if (!(vpage = ipz_qpageit_get_inc(&eq->ipz_queue))) {
+			ret = H_RESOURCE;
+			goto create_eq_exit2;
+		}
+
+		rpage = virt_to_abs(vpage);
+		ret = hipz_h_register_rpage_eq(shca->ipz_hca_handle,
+					       eq->ipz_eq_handle,
+					       &eq->pf,
+					       0, 0, rpage, 1);
+
+		if (i == (nr_pages - 1)) {
+			/* last page */
+			vpage = ipz_qpageit_get_inc(&eq->ipz_queue);
+			if (ret != H_SUCCESS || vpage)
+				goto create_eq_exit2;
+		} else {
+			if (ret != H_PAGE_REGISTERED || !vpage)
+				goto create_eq_exit2;
+		}
+	}
+
+	ipz_qeit_reset(&eq->ipz_queue);
+
+	/* register interrupt handlers and initialize work queues */
+	if (type == EHCA_EQ) {
+		ret = ibmebus_request_irq(NULL, eq->ist, ehca_interrupt_eq,
+					  SA_INTERRUPT, "ehca_eq",
+					  (void *)shca);
+		if (ret < 0)
+			EDEB_ERR(4, "Can't map interrupt handler.");
+
+		tasklet_init(&eq->interrupt_task, ehca_tasklet_eq, (long)shca);
+	} else if (type == EHCA_NEQ) {
+		ret = ibmebus_request_irq(NULL, eq->ist, ehca_interrupt_neq,
+					  SA_INTERRUPT, "ehca_neq",
+					  (void *)shca);
+		if (ret < 0)
+			EDEB_ERR(4, "Can't map interrupt handler.");
+
+		tasklet_init(&eq->interrupt_task, ehca_tasklet_neq, (long)shca);
+	}
+
+	eq->is_initialized = 1;
+
+	EDEB_EX(7, "ret=%lx", ret);
+
+	return 0;
+
+create_eq_exit2:
+	ipz_queue_dtor(&eq->ipz_queue);
+
+create_eq_exit1:
+	hipz_h_destroy_eq(shca->ipz_hca_handle, eq);
+
+	EDEB_EX(7, "ret=%lx", ret);
+
+	return -EINVAL;
+}
+
+void *ehca_poll_eq(struct ehca_shca *shca, struct ehca_eq *eq)
+{
+	unsigned long flags = 0;
+	void *eqe = NULL;
+
+	EDEB_EN(7, "shca=%p  eq=%p", shca, eq);
+	EHCA_CHECK_ADR_P(shca);
+	EHCA_CHECK_EQ_P(eq);
+
+	spin_lock_irqsave(&eq->spinlock, flags);
+	eqe = ipz_eqit_eq_get_inc_valid(&eq->ipz_queue);
+	spin_unlock_irqrestore(&eq->spinlock, flags);
+
+	EDEB_EX(7, "eq=%p eqe=%p", eq, eqe);
+
+	return eqe;
+}
+
+void ehca_poll_eqs(unsigned long data)
+{
+	struct ehca_shca *shca;
+	struct ehca_module *module = (struct ehca_module*)data;
+
+	spin_lock(&module->shca_lock);
+	list_for_each_entry(shca, &module->shca_list, shca_list) {
+		if (shca->eq.is_initialized)
+			ehca_tasklet_eq((unsigned long)(void*)shca);
+	}
+	mod_timer(&module->timer, jiffies + HZ);
+	spin_unlock(&module->shca_lock);
+
+	return;
+}
+
+int ehca_destroy_eq(struct ehca_shca *shca, struct ehca_eq *eq)
+{
+	unsigned long flags = 0;
+	u64 h_ret = H_SUCCESS;
+
+	EDEB_EN(7, "shca=%p  eq=%p", shca, eq);
+	EHCA_CHECK_ADR(shca);
+	EHCA_CHECK_EQ(eq);
+
+	spin_lock_irqsave(&eq->spinlock, flags);
+	ibmebus_free_irq(NULL, eq->ist, (void *)shca);
+
+	h_ret = hipz_h_destroy_eq(shca->ipz_hca_handle, eq);
+
+	spin_unlock_irqrestore(&eq->spinlock, flags);
+
+	if (h_ret != H_SUCCESS) {
+		EDEB_ERR(4, "Can't free EQ resources.");
+		return -EINVAL;
+	}
+	ipz_queue_dtor(&eq->ipz_queue);
+
+	EDEB_EX(7, "h_ret=%lx", h_ret);
+
+	return h_ret;
+}