linux-kernel - [PATCH v2 2/2] cxl: add set/get private data to context struct

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Date:	Tue,  8 Mar 2016 05:59:24 +1100
From:	"Ian Munsie" <imunsie@....ibm.com>
To:	Michael Ellerman <michaele@....ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Matt Ochs <mrochs@...ibm.com>, Manoj Kumar <kumarmn@...ibm.com>
Cc:	Michael Neuling <mikey@...ling.org>,
	linuxppc-dev <linuxppc-dev@...abs.org>,
	Ian Munsie <imunsie@....ibm.com>
Subject: [PATCH v2 2/2] cxl: add set/get private data to context struct

From: Michael Neuling <mikey@...ling.org>

This provides AFU drivers a means to associate private data with a cxl
context. This is particularly intended for make the new callbacks for
driver specific events easier for AFU drivers to use, as they can easily
get back to any private data structures they may use.

Signed-off-by: Michael Neuling <mikey@...ling.org>
Signed-off-by: Ian Munsie <imunsie@....ibm.com>
---

No changes since v1

 drivers/misc/cxl/api.c | 21 +++++++++++++++++++++
 drivers/misc/cxl/cxl.h |  3 +++
 include/misc/cxl.h     |  7 +++++++
 3 files changed, 31 insertions(+)

diff --git a/drivers/misc/cxl/api.c b/drivers/misc/cxl/api.c
index eebc9c3..93b270c 100644
--- a/drivers/misc/cxl/api.c
+++ b/drivers/misc/cxl/api.c
@@ -91,6 +91,27 @@ int cxl_release_context(struct cxl_context *ctx)
 }
 EXPORT_SYMBOL_GPL(cxl_release_context);
 
+
+int cxl_set_priv(struct cxl_context *ctx, void *priv)
+{
+	if (!ctx)
+		return -EINVAL;
+
+	ctx->priv = priv;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(cxl_set_priv);
+
+void *cxl_get_priv(struct cxl_context *ctx)
+{
+	if (!ctx)
+		return ERR_PTR(-EINVAL);
+
+	return ctx->priv;
+}
+EXPORT_SYMBOL_GPL(cxl_get_priv);
+
 int cxl_allocate_afu_irqs(struct cxl_context *ctx, int num)
 {
 	if (num == 0)
diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h
index 64e8e0a..71f66e7 100644
--- a/drivers/misc/cxl/cxl.h
+++ b/drivers/misc/cxl/cxl.h
@@ -454,6 +454,9 @@ struct cxl_context {
 	/* Only used in PR mode */
 	u64 process_token;
 
+	/* driver private data */
+	void *priv;
+
 	unsigned long *irq_bitmap; /* Accessed from IRQ context */
 	struct cxl_irq_ranges irqs;
 	struct list_head irq_names;
diff --git a/include/misc/cxl.h b/include/misc/cxl.h
index f198a42..f99b383 100644
--- a/include/misc/cxl.h
+++ b/include/misc/cxl.h
@@ -89,6 +89,13 @@ struct cxl_context *cxl_dev_context_init(struct pci_dev *dev);
 int cxl_release_context(struct cxl_context *ctx);
 
 /*
+ * Set and get private data associated with a context. Allows drivers to have a
+ * back pointer to some useful structure.
+ */
+int cxl_set_priv(struct cxl_context *ctx, void *priv);
+void *cxl_get_priv(struct cxl_context *ctx);
+
+/*
  * Allocate AFU interrupts for this context. num=0 will allocate the default
  * for this AFU as given in the AFU descriptor. This number doesn't include the
  * interrupt 0 (CAIA defines AFU IRQ 0 for page faults). Each interrupt to be
-- 
2.1.4