[PATCH 04/11] soc: fsl: dpio: add congestion notification support

From: "Horia Geantă" <horia.geanta@nxp.com>
To: Herbert Xu <herbert@gondor.apana.org.au>,
	Stuart Yoder <stuyoder@gmail.com>,
	Laurentiu Tudor <laurentiu.tudor@nxp.com>,
	Li Yang <leoyang.li@nxp.com>, Roy Pledge <roy.pledge@nxp.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>
Cc: "David S . Miller" <davem@davemloft.net>,
	Aymen Sghaier <aymen.sghaier@nxp.com>,
	linux-crypto@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 04/11] soc: fsl: dpio: add congestion notification support
Date: Mon, 10 Sep 2018 20:15:43 +0300	[thread overview]
Message-ID: <20180910171550.5659-5-horia.geanta@nxp.com> (raw)
In-Reply-To: <20180910171550.5659-1-horia.geanta@nxp.com>

Add support for Congestion State Change Notifications (CSCN), which
allow DPIO users to be notified when a congestion group changes its
state (due to hitting the entrance / exit threshold).

Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
---
 include/soc/fsl/dpaa2-global.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/soc/fsl/dpaa2-global.h b/include/soc/fsl/dpaa2-global.h
index 9bc0713346a8..2bfc379d3dc9 100644
--- a/include/soc/fsl/dpaa2-global.h
+++ b/include/soc/fsl/dpaa2-global.h
@@ -174,4 +174,19 @@ static inline const struct dpaa2_fd *dpaa2_dq_fd(const struct dpaa2_dq *dq)
 	return (const struct dpaa2_fd *)&dq->dq.fd[0];
 }
 
+#define DPAA2_CSCN_SIZE		sizeof(struct dpaa2_dq)
+#define DPAA2_CSCN_ALIGN	16
+#define DPAA2_CSCN_STATE_CG	BIT(0)
+
+/**
+ * dpaa2_cscn_state_congested() - Check congestion state
+ * @cscn: congestion SCN (delivered to WQ or memory)
+ *
+i * Return true is congested.
+ */
+static inline bool dpaa2_cscn_state_congested(struct dpaa2_dq *cscn)
+{
+	return !!(cscn->scn.state & DPAA2_CSCN_STATE_CG);
+}
+
 #endif /* __FSL_DPAA2_GLOBAL_H */
-- 
2.16.2

