add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/misc/ocxl/afu_irq.c
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@@ -1,8 +1,8 @@
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 // SPDX-License-Identifier: GPL-2.0+
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 // Copyright 2017 IBM Corp.
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 #include <linux/interrupt.h>
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-#include <linux/eventfd.h>
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 #include <asm/pnv-ocxl.h>
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+#include <asm/xive.h>
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 #include "ocxl_internal.h"
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 #include "trace.h"
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..
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@@ -11,28 +11,59 @@
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 	int hw_irq;
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 	unsigned int virq;
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 	char *name;
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-	u64 trigger_page;
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-	struct eventfd_ctx *ev_ctx;
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+	irqreturn_t (*handler)(void *private);
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+	void (*free_private)(void *private);
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+	void *private;
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 };
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18
 
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-static int irq_offset_to_id(struct ocxl_context *ctx, u64 offset)
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+int ocxl_irq_offset_to_id(struct ocxl_context *ctx, u64 offset)
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 {
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 	return (offset - ctx->afu->irq_base_offset) >> PAGE_SHIFT;
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 }
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-static u64 irq_id_to_offset(struct ocxl_context *ctx, int id)
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+u64 ocxl_irq_id_to_offset(struct ocxl_context *ctx, int irq_id)
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 {
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-	return ctx->afu->irq_base_offset + (id << PAGE_SHIFT);
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+	return ctx->afu->irq_base_offset + (irq_id << PAGE_SHIFT);
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 }
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+
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+int ocxl_irq_set_handler(struct ocxl_context *ctx, int irq_id,
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+		irqreturn_t (*handler)(void *private),
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+		void (*free_private)(void *private),
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+		void *private)
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+{
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+	struct afu_irq *irq;
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+	int rc;
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+
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+	mutex_lock(&ctx->irq_lock);
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+	irq = idr_find(&ctx->irq_idr, irq_id);
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+	if (!irq) {
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+		rc = -EINVAL;
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+		goto unlock;
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+	}
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+
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+	irq->handler = handler;
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+	irq->private = private;
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+	irq->free_private = free_private;
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+
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+	rc = 0;
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+	// Fall through to unlock
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+
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+unlock:
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+	mutex_unlock(&ctx->irq_lock);
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+	return rc;
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+}
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+EXPORT_SYMBOL_GPL(ocxl_irq_set_handler);
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 static irqreturn_t afu_irq_handler(int virq, void *data)
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 {
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 	struct afu_irq *irq = (struct afu_irq *) data;
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 	trace_ocxl_afu_irq_receive(virq);
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-	if (irq->ev_ctx)
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-		eventfd_signal(irq->ev_ctx, 1);
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-	return IRQ_HANDLED;
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+
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+	if (irq->handler)
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+		return irq->handler(irq->private);
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+
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+	return IRQ_HANDLED; // Just drop it on the ground
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 }
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68
 
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 static int setup_afu_irq(struct ocxl_context *ctx, struct afu_irq *irq)
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@@ -70,7 +101,7 @@
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 	kfree(irq->name);
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 }
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-int ocxl_afu_irq_alloc(struct ocxl_context *ctx, u64 *irq_offset)
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+int ocxl_afu_irq_alloc(struct ocxl_context *ctx, int *irq_id)
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 {
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 	struct afu_irq *irq;
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 	int rc;
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@@ -93,8 +124,7 @@
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 		goto err_unlock;
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 	}
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-	rc = ocxl_link_irq_alloc(ctx->afu->fn->link, &irq->hw_irq,
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-				&irq->trigger_page);
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+	rc = ocxl_link_irq_alloc(ctx->afu->fn->link, &irq->hw_irq);
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 	if (rc)
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 		goto err_idr;
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@@ -102,11 +132,11 @@
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 	if (rc)
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 		goto err_alloc;
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-	*irq_offset = irq_id_to_offset(ctx, irq->id);
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-
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-	trace_ocxl_afu_irq_alloc(ctx->pasid, irq->id, irq->virq, irq->hw_irq,
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-				*irq_offset);
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+	trace_ocxl_afu_irq_alloc(ctx->pasid, irq->id, irq->virq, irq->hw_irq);
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 	mutex_unlock(&ctx->irq_lock);
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+
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+	*irq_id = irq->id;
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+
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 	return 0;
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 err_alloc:
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@@ -118,29 +148,29 @@
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 	kfree(irq);
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 	return rc;
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 }
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+EXPORT_SYMBOL_GPL(ocxl_afu_irq_alloc);
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 static void afu_irq_free(struct afu_irq *irq, struct ocxl_context *ctx)
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 {
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 	trace_ocxl_afu_irq_free(ctx->pasid, irq->id);
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 	if (ctx->mapping)
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 		unmap_mapping_range(ctx->mapping,
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-				irq_id_to_offset(ctx, irq->id),
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+				ocxl_irq_id_to_offset(ctx, irq->id),
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 				1 << PAGE_SHIFT, 1);
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 	release_afu_irq(irq);
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-	if (irq->ev_ctx)
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-		eventfd_ctx_put(irq->ev_ctx);
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+	if (irq->free_private)
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+		irq->free_private(irq->private);
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 	ocxl_link_free_irq(ctx->afu->fn->link, irq->hw_irq);
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 	kfree(irq);
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 }
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-int ocxl_afu_irq_free(struct ocxl_context *ctx, u64 irq_offset)
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+int ocxl_afu_irq_free(struct ocxl_context *ctx, int irq_id)
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 {
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 	struct afu_irq *irq;
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-	int id = irq_offset_to_id(ctx, irq_offset);
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 	mutex_lock(&ctx->irq_lock);
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-	irq = idr_find(&ctx->irq_idr, id);
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+	irq = idr_find(&ctx->irq_idr, irq_id);
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 	if (!irq) {
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 		mutex_unlock(&ctx->irq_lock);
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 		return -EINVAL;
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@@ -150,6 +180,7 @@
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 	mutex_unlock(&ctx->irq_lock);
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 	return 0;
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 }
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+EXPORT_SYMBOL_GPL(ocxl_afu_irq_free);
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 void ocxl_afu_irq_free_all(struct ocxl_context *ctx)
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 {
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@@ -162,41 +193,19 @@
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 	mutex_unlock(&ctx->irq_lock);
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 }
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-int ocxl_afu_irq_set_fd(struct ocxl_context *ctx, u64 irq_offset, int eventfd)
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+u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, int irq_id)
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 {
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+	struct xive_irq_data *xd;
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 	struct afu_irq *irq;
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-	struct eventfd_ctx *ev_ctx;
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-	int rc = 0, id = irq_offset_to_id(ctx, irq_offset);
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-
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-	mutex_lock(&ctx->irq_lock);
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-	irq = idr_find(&ctx->irq_idr, id);
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-	if (!irq) {
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-		rc = -EINVAL;
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-		goto unlock;
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-	}
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-
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-	ev_ctx = eventfd_ctx_fdget(eventfd);
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-	if (IS_ERR(ev_ctx)) {
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-		rc = -EINVAL;
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-		goto unlock;
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-	}
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-
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-	irq->ev_ctx = ev_ctx;
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-unlock:
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-	mutex_unlock(&ctx->irq_lock);
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-	return rc;
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-}
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-
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-u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, u64 irq_offset)
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-{
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-	struct afu_irq *irq;
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-	int id = irq_offset_to_id(ctx, irq_offset);
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 	u64 addr = 0;
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 	mutex_lock(&ctx->irq_lock);
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-	irq = idr_find(&ctx->irq_idr, id);
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-	if (irq)
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-		addr = irq->trigger_page;
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+	irq = idr_find(&ctx->irq_idr, irq_id);
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+	if (irq) {
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+		xd = irq_get_handler_data(irq->virq);
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+		addr = xd ? xd->trig_page : 0;
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+	}
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 	mutex_unlock(&ctx->irq_lock);
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 	return addr;
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 }
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+EXPORT_SYMBOL_GPL(ocxl_afu_irq_get_addr);