Subject: [PATCH 3/4] ocxl: Don't return trigger page when allocating an interrupt

From: Frederic Barrat <[email-masked]>
Date: Thu, 2 Apr 2020 17:43:51 +0200

Existing users of ocxl_link_irq_alloc() have been converted to obtain
the trigger page of an interrupt through xive directly, we therefore
have no need to return the trigger page when allocating an interrupt.

It also allows ocxl to use the xive native interface to allocate
interrupts, instead of its custom service.

Signed-off-by: Frederic Barrat <[email-masked]>
---
 drivers/misc/ocxl/Kconfig       |  2 +-
 drivers/misc/ocxl/afu_irq.c     |  4 +---
 drivers/misc/ocxl/link.c        | 15 +++++++--------
 drivers/scsi/cxlflash/ocxl_hw.c |  3 +--
 include/misc/ocxl.h             | 10 ++--------
 5 files changed, 12 insertions(+), 22 deletions(-)

diff --git a/drivers/misc/ocxl/Kconfig b/drivers/misc/ocxl/Kconfig
index 2d2266c1439e..e65773f5cf59 100644
--- a/drivers/misc/ocxl/Kconfig
+++ b/drivers/misc/ocxl/Kconfig
@@ -9,7 +9,7 @@ config OCXL_BASE
 
 config OCXL
 	tristate "OpenCAPI coherent accelerator support"
-	depends on PPC_POWERNV && PCI && EEH
+	depends on PPC_POWERNV && PCI && EEH && PPC_XIVE_NATIVE
 	select OCXL_BASE
 	select HOTPLUG_PCI_POWERNV
 	default m
diff --git a/drivers/misc/ocxl/afu_irq.c b/drivers/misc/ocxl/afu_irq.c
index b30ec0ef7be7..ecdcfae025b7 100644
--- a/drivers/misc/ocxl/afu_irq.c
+++ b/drivers/misc/ocxl/afu_irq.c
@@ -11,7 +11,6 @@ struct afu_irq {
 	int hw_irq;
 	unsigned int virq;
 	char *name;
-	u64 trigger_page;
 	irqreturn_t (*handler)(void *private);
 	void (*free_private)(void *private);
 	void *private;
@@ -125,8 +124,7 @@ int ocxl_afu_irq_alloc(struct ocxl_context *ctx, int *irq_id)
 		goto err_unlock;
 	}
 
-	rc = ocxl_link_irq_alloc(ctx->afu->fn->link, &irq->hw_irq,
-				&irq->trigger_page);
+	rc = ocxl_link_irq_alloc(ctx->afu->fn->link, &irq->hw_irq);
 	if (rc)
 		goto err_idr;
 
diff --git a/drivers/misc/ocxl/link.c b/drivers/misc/ocxl/link.c
index 58d111afd9f6..fd73d3bc0eb6 100644
--- a/drivers/misc/ocxl/link.c
+++ b/drivers/misc/ocxl/link.c
@@ -6,6 +6,7 @@
 #include <linux/mmu_context.h>
 #include <asm/copro.h>
 #include <asm/pnv-ocxl.h>
+#include <asm/xive.h>
 #include <misc/ocxl.h>
 #include "ocxl_internal.h"
 #include "trace.h"
@@ -682,23 +683,21 @@ int ocxl_link_remove_pe(void *link_handle, int pasid)
 }
 EXPORT_SYMBOL_GPL(ocxl_link_remove_pe);
 
-int ocxl_link_irq_alloc(void *link_handle, int *hw_irq, u64 *trigger_addr)
+int ocxl_link_irq_alloc(void *link_handle, int *hw_irq)
 {
 	struct ocxl_link *link = (struct ocxl_link *) link_handle;
-	int rc, irq;
-	u64 addr;
+	int irq;
 
 	if (atomic_dec_if_positive(&link->irq_available) < 0)
 		return -ENOSPC;
 
-	rc = pnv_ocxl_alloc_xive_irq(&irq, &addr);
-	if (rc) {
+	irq = xive_native_alloc_irq();
+	if (!irq) {
 		atomic_inc(&link->irq_available);
-		return rc;
+		return -ENXIO;
 	}
 
 	*hw_irq = irq;
-	*trigger_addr = addr;
 	return 0;
 }
 EXPORT_SYMBOL_GPL(ocxl_link_irq_alloc);
@@ -707,7 +706,7 @@ void ocxl_link_free_irq(void *link_handle, int hw_irq)
 {
 	struct ocxl_link *link = (struct ocxl_link *) link_handle;
 
-	pnv_ocxl_free_xive_irq(hw_irq);
+	xive_native_free_irq(hw_irq);
 	atomic_inc(&link->irq_available);
 }
 EXPORT_SYMBOL_GPL(ocxl_link_free_irq);
diff --git a/drivers/scsi/cxlflash/ocxl_hw.c b/drivers/scsi/cxlflash/ocxl_hw.c
index 59452850f71c..03bff0cae658 100644
--- a/drivers/scsi/cxlflash/ocxl_hw.c
+++ b/drivers/scsi/cxlflash/ocxl_hw.c
@@ -613,7 +613,6 @@ static int alloc_afu_irqs(struct ocxlflash_context *ctx, int num)
 	struct ocxl_hw_afu *afu = ctx->hw_afu;
 	struct device *dev = afu->dev;
 	struct ocxlflash_irqs *irqs;
-	u64 addr;
 	int rc = 0;
 	int hwirq;
 	int i;
@@ -638,7 +637,7 @@ static int alloc_afu_irqs(struct ocxlflash_context *ctx, int num)
 	}
 
 	for (i = 0; i < num; i++) {
-		rc = ocxl_link_irq_alloc(afu->link_token, &hwirq, &addr);
+		rc = ocxl_link_irq_alloc(afu->link_token, &hwirq);
 		if (unlikely(rc)) {
 			dev_err(dev, "%s: ocxl_link_irq_alloc failed rc=%d\n",
 				__func__, rc);
diff --git a/include/misc/ocxl.h b/include/misc/ocxl.h
index 06dd5839e438..a2868adec22f 100644
--- a/include/misc/ocxl.h
+++ b/include/misc/ocxl.h
@@ -480,14 +480,8 @@ int ocxl_link_remove_pe(void *link_handle, int pasid);
  * Allocate an AFU interrupt associated to the link.
  *
  * 'hw_irq' is the hardware interrupt number
- * 'obj_handle' is the 64-bit object handle to be passed to the AFU to
- * trigger the interrupt.
- * On P9, 'obj_handle' is an address, which, if written, triggers the
- * interrupt. It is an MMIO address which needs to be remapped (one
- * page).
- */
-int ocxl_link_irq_alloc(void *link_handle, int *hw_irq,
-			u64 *obj_handle);
+ */
+int ocxl_link_irq_alloc(void *link_handle, int *hw_irq);
 
 /*
  * Free a previously allocated AFU interrupt
-- 
2.25.1