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From:   "Alastair D'Silva" <alastair@au1.ibm.com>
Cc:     "Alastair D'Silva" <alastair@d-silva.org>,
        Frederic Barrat <fbarrat@linux.ibm.com>,
        Andrew Donnellan <andrew.donnellan@au1.ibm.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: [PATCH 6/7] ocxl: afu_irq only deals with IRQ IDs, not offsets
Date:   Wed, 13 Mar 2019 15:15:21 +1100
In-Reply-To: <20190313041524.14644-1-alastair@au1.ibm.com>
References: <20190313041524.14644-1-alastair@au1.ibm.com>
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From: Alastair D'Silva <alastair@d-silva.org>

The use of offsets is required only in the frontend, so alter
the IRQ API to only work with IRQ IDs in the backend.

Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
---
 drivers/misc/ocxl/afu_irq.c       | 31 +++++++++++++------------------
 drivers/misc/ocxl/context.c       |  7 +++++--
 drivers/misc/ocxl/file.c          | 13 ++++++++-----
 drivers/misc/ocxl/ocxl_internal.h | 10 ++++++----
 drivers/misc/ocxl/trace.h         | 12 ++++--------
 5 files changed, 36 insertions(+), 37 deletions(-)

diff --git a/drivers/misc/ocxl/afu_irq.c b/drivers/misc/ocxl/afu_irq.c
index 11ab996657a2..1885c472df58 100644
--- a/drivers/misc/ocxl/afu_irq.c
+++ b/drivers/misc/ocxl/afu_irq.c
@@ -14,14 +14,14 @@ struct afu_irq {
 	struct eventfd_ctx *ev_ctx;
 };
 
-static int irq_offset_to_id(struct ocxl_context *ctx, u64 offset)
+int ocxl_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)
+u64 ocxl_irq_id_to_offset(struct ocxl_context *ctx, int irq_id)
 {
-	return ctx->afu->irq_base_offset + (id << PAGE_SHIFT);
+	return ctx->afu->irq_base_offset + (irq_id << PAGE_SHIFT);
 }
 
 static irqreturn_t afu_irq_handler(int virq, void *data)
@@ -69,7 +69,7 @@ static void release_afu_irq(struct afu_irq *irq)
 	kfree(irq->name);
 }
 
-int ocxl_afu_irq_alloc(struct ocxl_context *ctx, u64 *irq_offset)
+int ocxl_afu_irq_alloc(struct ocxl_context *ctx, int *irq_id)
 {
 	struct afu_irq *irq;
 	int rc;
@@ -101,10 +101,7 @@ int ocxl_afu_irq_alloc(struct ocxl_context *ctx, u64 *irq_offset)
 	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);
+	trace_ocxl_afu_irq_alloc(ctx->pasid, irq->id, irq->virq, irq->hw_irq);
 	mutex_unlock(&ctx->irq_lock);
 	return 0;
 
@@ -123,7 +120,7 @@ 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),
+				ocxl_irq_id_to_offset(ctx, irq->id),
 				1 << PAGE_SHIFT, 1);
 	release_afu_irq(irq);
 	if (irq->ev_ctx)
@@ -132,14 +129,13 @@ static void afu_irq_free(struct afu_irq *irq, struct ocxl_context *ctx)
 	kfree(irq);
 }
 
-int ocxl_afu_irq_free(struct ocxl_context *ctx, u64 irq_offset)
+int ocxl_afu_irq_free(struct ocxl_context *ctx, int irq_id)
 {
 	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);
+	irq = idr_find(&ctx->irq_idr, irq_id);
 	if (!irq) {
 		mutex_unlock(&ctx->irq_lock);
 		return -EINVAL;
@@ -161,14 +157,14 @@ void ocxl_afu_irq_free_all(struct ocxl_context *ctx)
 	mutex_unlock(&ctx->irq_lock);
 }
 
-int ocxl_afu_irq_set_fd(struct ocxl_context *ctx, u64 irq_offset, int eventfd)
+int ocxl_afu_irq_set_fd(struct ocxl_context *ctx, int irq_id, int eventfd)
 {
 	struct afu_irq *irq;
 	struct eventfd_ctx *ev_ctx;
-	int rc = 0, id = irq_offset_to_id(ctx, irq_offset);
+	int rc = 0;
 
 	mutex_lock(&ctx->irq_lock);
-	irq = idr_find(&ctx->irq_idr, id);
+	irq = idr_find(&ctx->irq_idr, irq_id);
 	if (!irq) {
 		rc = -EINVAL;
 		goto unlock;
@@ -186,14 +182,13 @@ int ocxl_afu_irq_set_fd(struct ocxl_context *ctx, u64 irq_offset, int eventfd)
 	return rc;
 }
 
-u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, u64 irq_offset)
+u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, int irq_id)
 {
 	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);
+	irq = idr_find(&ctx->irq_idr, irq_id);
 	if (irq)
 		addr = irq->trigger_page;
 	mutex_unlock(&ctx->irq_lock);
diff --git a/drivers/misc/ocxl/context.c b/drivers/misc/ocxl/context.c
index 9a37e9632cd9..c04887591837 100644
--- a/drivers/misc/ocxl/context.c
+++ b/drivers/misc/ocxl/context.c
@@ -93,8 +93,9 @@ static vm_fault_t map_afu_irq(struct vm_area_struct *vma, unsigned long address,
 		u64 offset, struct ocxl_context *ctx)
 {
 	u64 trigger_addr;
+	int irq_id = ocxl_irq_offset_to_id(ctx, offset);
 
-	trigger_addr = ocxl_afu_irq_get_addr(ctx, offset);
+	trigger_addr = ocxl_afu_irq_get_addr(ctx, irq_id);
 	if (!trigger_addr)
 		return VM_FAULT_SIGBUS;
 
@@ -154,12 +155,14 @@ static const struct vm_operations_struct ocxl_vmops = {
 static int check_mmap_afu_irq(struct ocxl_context *ctx,
 			struct vm_area_struct *vma)
 {
+	int irq_id = ocxl_irq_offset_to_id(ctx, vma->vm_pgoff << PAGE_SHIFT);
+
 	/* only one page */
 	if (vma_pages(vma) != 1)
 		return -EINVAL;
 
 	/* check offset validty */
-	if (!ocxl_afu_irq_get_addr(ctx, vma->vm_pgoff << PAGE_SHIFT))
+	if (!ocxl_afu_irq_get_addr(ctx, irq_id))
 		return -EINVAL;
 
 	/*
diff --git a/drivers/misc/ocxl/file.c b/drivers/misc/ocxl/file.c
index 424bb0b40afb..d28618c161de 100644
--- a/drivers/misc/ocxl/file.c
+++ b/drivers/misc/ocxl/file.c
@@ -197,6 +197,7 @@ static long afu_ioctl(struct file *file, unsigned int cmd,
 {
 	struct ocxl_context *ctx = file->private_data;
 	struct ocxl_ioctl_irq_fd irq_fd;
+	int irq_id;
 	u64 irq_offset;
 	long rc;
 	bool closed;
@@ -218,12 +219,13 @@ static long afu_ioctl(struct file *file, unsigned int cmd,
 		break;
 
 	case OCXL_IOCTL_IRQ_ALLOC:
-		rc = ocxl_afu_irq_alloc(ctx, &irq_offset);
+		rc = ocxl_afu_irq_alloc(ctx, &irq_id);
 		if (!rc) {
+			irq_offset = ocxl_irq_id_to_offset(ctx, irq_id);
 			rc = copy_to_user((u64 __user *) args, &irq_offset,
 					sizeof(irq_offset));
 			if (rc) {
-				ocxl_afu_irq_free(ctx, irq_offset);
+				ocxl_afu_irq_free(ctx, irq_id);
 				return -EFAULT;
 			}
 		}
@@ -234,7 +236,8 @@ static long afu_ioctl(struct file *file, unsigned int cmd,
 				sizeof(irq_offset));
 		if (rc)
 			return -EFAULT;
-		rc = ocxl_afu_irq_free(ctx, irq_offset);
+		irq_id = ocxl_irq_offset_to_id(ctx, irq_offset);
+		rc = ocxl_afu_irq_free(ctx, irq_id);
 		break;
 
 	case OCXL_IOCTL_IRQ_SET_FD:
@@ -244,8 +247,8 @@ static long afu_ioctl(struct file *file, unsigned int cmd,
 			return -EFAULT;
 		if (irq_fd.reserved)
 			return -EINVAL;
-		rc = ocxl_afu_irq_set_fd(ctx, irq_fd.irq_offset,
-					irq_fd.eventfd);
+		irq_id = ocxl_irq_offset_to_id(ctx, irq_fd.irq_offset);
+		rc = ocxl_afu_irq_set_fd(ctx, irq_id, irq_fd.eventfd);
 		break;
 
 	case OCXL_IOCTL_GET_METADATA:
diff --git a/drivers/misc/ocxl/ocxl_internal.h b/drivers/misc/ocxl/ocxl_internal.h
index 4fc7e9597ede..871155b464da 100644
--- a/drivers/misc/ocxl/ocxl_internal.h
+++ b/drivers/misc/ocxl/ocxl_internal.h
@@ -140,12 +140,14 @@ void ocxl_context_detach_all(struct ocxl_afu *afu);
 int ocxl_sysfs_register_afu(struct ocxl_afu *afu);
 void ocxl_sysfs_unregister_afu(struct ocxl_afu *afu);
 
-int ocxl_afu_irq_alloc(struct ocxl_context *ctx, u64 *irq_offset);
-int ocxl_afu_irq_free(struct ocxl_context *ctx, u64 irq_offset);
+int ocxl_irq_offset_to_id(struct ocxl_context *ctx, u64 offset);
+u64 ocxl_irq_id_to_offset(struct ocxl_context *ctx, int irq_id);
+int ocxl_afu_irq_alloc(struct ocxl_context *ctx, int *irq_id);
+int ocxl_afu_irq_free(struct ocxl_context *ctx, int irq_id);
 void ocxl_afu_irq_free_all(struct ocxl_context *ctx);
-int ocxl_afu_irq_set_fd(struct ocxl_context *ctx, u64 irq_offset,
+int ocxl_afu_irq_set_fd(struct ocxl_context *ctx, int irq_id,
 			int eventfd);
-u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, u64 irq_offset);
+u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, int irq_id);
 
 /**
  * Free an AFU
diff --git a/drivers/misc/ocxl/trace.h b/drivers/misc/ocxl/trace.h
index 68bf2f173a1a..a081e644f5f3 100644
--- a/drivers/misc/ocxl/trace.h
+++ b/drivers/misc/ocxl/trace.h
@@ -107,16 +107,14 @@ DEFINE_EVENT(ocxl_fault_handler, ocxl_fault_ack,
 );
 
 TRACE_EVENT(ocxl_afu_irq_alloc,
-	TP_PROTO(int pasid, int irq_id, unsigned int virq, int hw_irq,
-		u64 irq_offset),
-	TP_ARGS(pasid, irq_id, virq, hw_irq, irq_offset),
+	TP_PROTO(int pasid, int irq_id, unsigned int virq, int hw_irq),
+	TP_ARGS(pasid, irq_id, virq, hw_irq),
 
 	TP_STRUCT__entry(
 		__field(int, pasid)
 		__field(int, irq_id)
 		__field(unsigned int, virq)
 		__field(int, hw_irq)
-		__field(u64, irq_offset)
 	),
 
 	TP_fast_assign(
@@ -124,15 +122,13 @@ TRACE_EVENT(ocxl_afu_irq_alloc,
 		__entry->irq_id = irq_id;
 		__entry->virq = virq;
 		__entry->hw_irq = hw_irq;
-		__entry->irq_offset = irq_offset;
 	),
 
-	TP_printk("pasid=%#x irq_id=%d virq=%u hw_irq=%d irq_offset=%#llx",
+	TP_printk("pasid=%#x irq_id=%d virq=%u hw_irq=%d",
 		__entry->pasid,
 		__entry->irq_id,
 		__entry->virq,
-		__entry->hw_irq,
-		__entry->irq_offset
+		__entry->hw_irq
 	)
 );
 
-- 
2.20.1