1 // SPDX-License-Identifier: GPL-2.0+
2 // Copyright 2017 IBM Corp.
3 #include <linux/interrupt.h>
4 #include <linux/eventfd.h>
5 #include <asm/pnv-ocxl.h>
6 #include "ocxl_internal.h"
15 struct eventfd_ctx *ev_ctx;
18 static int irq_offset_to_id(struct ocxl_context *ctx, u64 offset)
20 return (offset - ctx->afu->irq_base_offset) >> PAGE_SHIFT;
23 static u64 irq_id_to_offset(struct ocxl_context *ctx, int id)
25 return ctx->afu->irq_base_offset + (id << PAGE_SHIFT);
28 static irqreturn_t afu_irq_handler(int virq, void *data)
30 struct afu_irq *irq = (struct afu_irq *) data;
32 trace_ocxl_afu_irq_receive(virq);
34 eventfd_signal(irq->ev_ctx, 1);
38 static int setup_afu_irq(struct ocxl_context *ctx, struct afu_irq *irq)
42 irq->virq = irq_create_mapping(NULL, irq->hw_irq);
44 pr_err("irq_create_mapping failed\n");
47 pr_debug("hw_irq %d mapped to virq %u\n", irq->hw_irq, irq->virq);
49 irq->name = kasprintf(GFP_KERNEL, "ocxl-afu-%u", irq->virq);
51 irq_dispose_mapping(irq->virq);
55 rc = request_irq(irq->virq, afu_irq_handler, 0, irq->name, irq);
59 irq_dispose_mapping(irq->virq);
60 pr_err("request_irq failed: %d\n", rc);
66 static void release_afu_irq(struct afu_irq *irq)
68 free_irq(irq->virq, irq);
69 irq_dispose_mapping(irq->virq);
73 int ocxl_afu_irq_alloc(struct ocxl_context *ctx, u64 *irq_offset)
78 irq = kzalloc(sizeof(struct afu_irq), GFP_KERNEL);
83 * We limit the number of afu irqs per context and per link to
84 * avoid a single process or user depleting the pool of IPIs
87 mutex_lock(&ctx->irq_lock);
89 irq->id = idr_alloc(&ctx->irq_idr, irq, 0, MAX_IRQ_PER_CONTEXT,
96 rc = ocxl_link_irq_alloc(ctx->afu->fn->link, &irq->hw_irq,
101 rc = setup_afu_irq(ctx, irq);
105 *irq_offset = irq_id_to_offset(ctx, irq->id);
107 trace_ocxl_afu_irq_alloc(ctx->pasid, irq->id, irq->virq, irq->hw_irq,
109 mutex_unlock(&ctx->irq_lock);
113 ocxl_link_free_irq(ctx->afu->fn->link, irq->hw_irq);
115 idr_remove(&ctx->irq_idr, irq->id);
117 mutex_unlock(&ctx->irq_lock);
122 static void afu_irq_free(struct afu_irq *irq, struct ocxl_context *ctx)
124 trace_ocxl_afu_irq_free(ctx->pasid, irq->id);
126 unmap_mapping_range(ctx->mapping,
127 irq_id_to_offset(ctx, irq->id),
129 release_afu_irq(irq);
131 eventfd_ctx_put(irq->ev_ctx);
132 ocxl_link_free_irq(ctx->afu->fn->link, irq->hw_irq);
136 int ocxl_afu_irq_free(struct ocxl_context *ctx, u64 irq_offset)
139 int id = irq_offset_to_id(ctx, irq_offset);
141 mutex_lock(&ctx->irq_lock);
143 irq = idr_find(&ctx->irq_idr, id);
145 mutex_unlock(&ctx->irq_lock);
148 idr_remove(&ctx->irq_idr, irq->id);
149 afu_irq_free(irq, ctx);
150 mutex_unlock(&ctx->irq_lock);
154 void ocxl_afu_irq_free_all(struct ocxl_context *ctx)
159 mutex_lock(&ctx->irq_lock);
160 idr_for_each_entry(&ctx->irq_idr, irq, id)
161 afu_irq_free(irq, ctx);
162 mutex_unlock(&ctx->irq_lock);
165 int ocxl_afu_irq_set_fd(struct ocxl_context *ctx, u64 irq_offset, int eventfd)
168 struct eventfd_ctx *ev_ctx;
169 int rc = 0, id = irq_offset_to_id(ctx, irq_offset);
171 mutex_lock(&ctx->irq_lock);
172 irq = idr_find(&ctx->irq_idr, id);
178 ev_ctx = eventfd_ctx_fdget(eventfd);
179 if (IS_ERR(ev_ctx)) {
184 irq->ev_ctx = ev_ctx;
186 mutex_unlock(&ctx->irq_lock);
190 u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, u64 irq_offset)
193 int id = irq_offset_to_id(ctx, irq_offset);
196 mutex_lock(&ctx->irq_lock);
197 irq = idr_find(&ctx->irq_idr, id);
199 addr = irq->trigger_page;
200 mutex_unlock(&ctx->irq_lock);