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// SPDX-License-Identifier: GPL-2.0+
// Copyright 2017 IBM Corp.
#include <linux/interrupt.h>
#include <linux/eventfd.h>
#include <asm/pnv-ocxl.h>
#include "ocxl_internal.h"
#include "trace.h"
struct afu_irq {
int id;
int hw_irq;
unsigned int virq;
char *name;
u64 trigger_page;
struct eventfd_ctx *ev_ctx;
};
static int irq_offset_to_id(struct ocxl_context *ctx, u64 offset)
{
return (offset - ctx->afu->irq_base_offset) >> PAGE_SHIFT;
}
static u64 irq_id_to_offset(struct ocxl_context *ctx, int id)
{
return ctx->afu->irq_base_offset + (id << PAGE_SHIFT);
}
static irqreturn_t afu_irq_handler(int virq, void *data)
{
struct afu_irq *irq = (struct afu_irq *) data;
trace_ocxl_afu_irq_receive(virq);
if (irq->ev_ctx)
eventfd_signal(irq->ev_ctx, 1);
return IRQ_HANDLED;
}
static int setup_afu_irq(struct ocxl_context *ctx, struct afu_irq *irq)
{
int rc;
irq->virq = irq_create_mapping(NULL, irq->hw_irq);
if (!irq->virq) {
pr_err("irq_create_mapping failed\n");
return -ENOMEM;
}
pr_debug("hw_irq %d mapped to virq %u\n", irq->hw_irq, irq->virq);
irq->name = kasprintf(GFP_KERNEL, "ocxl-afu-%u", irq->virq);
if (!irq->name) {
irq_dispose_mapping(irq->virq);
return -ENOMEM;
}
rc = request_irq(irq->virq, afu_irq_handler, 0, irq->name, irq);
if (rc) {
kfree(irq->name);
irq->name = NULL;
irq_dispose_mapping(irq->virq);
pr_err("request_irq failed: %d\n", rc);
return rc;
}
return 0;
}
static void release_afu_irq(struct afu_irq *irq)
{
free_irq(irq->virq, irq);
irq_dispose_mapping(irq->virq);
kfree(irq->name);
}
int ocxl_afu_irq_alloc(struct ocxl_context *ctx, u64 *irq_offset)
{
struct afu_irq *irq;
int rc;
irq = kzalloc(sizeof(struct afu_irq), GFP_KERNEL);
if (!irq)
return -ENOMEM;
/*
* We limit the number of afu irqs per context and per link to
* avoid a single process or user depleting the pool of IPIs
*/
mutex_lock(&ctx->irq_lock);
irq->id = idr_alloc(&ctx->irq_idr, irq, 0, MAX_IRQ_PER_CONTEXT,
GFP_KERNEL);
if (irq->id < 0) {
rc = -ENOSPC;
goto err_unlock;
}
rc = ocxl_link_irq_alloc(ctx->afu->fn->link, &irq->hw_irq,
&irq->trigger_page);
if (rc)
goto err_idr;
rc = setup_afu_irq(ctx, irq);
if (rc)
goto err_alloc;
*irq_offset = irq_id_to_offset(ctx, irq->id);
trace_ocxl_afu_irq_alloc(ctx->pasid, irq->id, irq->virq, irq->hw_irq,
*irq_offset);
mutex_unlock(&ctx->irq_lock);
return 0;
err_alloc:
ocxl_link_free_irq(ctx->afu->fn->link, irq->hw_irq);
err_idr:
idr_remove(&ctx->irq_idr, irq->id);
err_unlock:
mutex_unlock(&ctx->irq_lock);
kfree(irq);
return rc;
}
static void afu_irq_free(struct afu_irq *irq, struct ocxl_context *ctx)
{
trace_ocxl_afu_irq_free(ctx->pasid, irq->id);
if (ctx->mapping)
unmap_mapping_range(ctx->mapping,
irq_id_to_offset(ctx, irq->id),
1 << PAGE_SHIFT, 1);
release_afu_irq(irq);
if (irq->ev_ctx)
eventfd_ctx_put(irq->ev_ctx);
ocxl_link_free_irq(ctx->afu->fn->link, irq->hw_irq);
kfree(irq);
}
int ocxl_afu_irq_free(struct ocxl_context *ctx, u64 irq_offset)
{
struct afu_irq *irq;
int id = irq_offset_to_id(ctx, irq_offset);
mutex_lock(&ctx->irq_lock);
irq = idr_find(&ctx->irq_idr, id);
if (!irq) {
mutex_unlock(&ctx->irq_lock);
return -EINVAL;
}
idr_remove(&ctx->irq_idr, irq->id);
afu_irq_free(irq, ctx);
mutex_unlock(&ctx->irq_lock);
return 0;
}
void ocxl_afu_irq_free_all(struct ocxl_context *ctx)
{
struct afu_irq *irq;
int id;
mutex_lock(&ctx->irq_lock);
idr_for_each_entry(&ctx->irq_idr, irq, id)
afu_irq_free(irq, ctx);
mutex_unlock(&ctx->irq_lock);
}
int ocxl_afu_irq_set_fd(struct ocxl_context *ctx, u64 irq_offset, int eventfd)
{
struct afu_irq *irq;
struct eventfd_ctx *ev_ctx;
int rc = 0, id = irq_offset_to_id(ctx, irq_offset);
mutex_lock(&ctx->irq_lock);
irq = idr_find(&ctx->irq_idr, id);
if (!irq) {
rc = -EINVAL;
goto unlock;
}
ev_ctx = eventfd_ctx_fdget(eventfd);
if (IS_ERR(ev_ctx)) {
rc = -EINVAL;
goto unlock;
}
irq->ev_ctx = ev_ctx;
unlock:
mutex_unlock(&ctx->irq_lock);
return rc;
}
u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, u64 irq_offset)
{
struct afu_irq *irq;
int id = irq_offset_to_id(ctx, irq_offset);
u64 addr = 0;
mutex_lock(&ctx->irq_lock);
irq = idr_find(&ctx->irq_idr, id);
if (irq)
addr = irq->trigger_page;
mutex_unlock(&ctx->irq_lock);
return addr;
}
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