linux-kernel - [PATCH v2 04/12] soc: fsl: dpio: add congestion notification support

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Message-Id: <20180912085937.22489-5-horia.geanta@nxp.com>
Date:   Wed, 12 Sep 2018 11:59:29 +0300
From:   Horia Geantă <horia.geanta@....com>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        Stuart Yoder <stuyoder@...il.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Li Yang <leoyang.li@....com>, Roy Pledge <roy.pledge@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Aymen Sghaier <aymen.sghaier@....com>,
        linux-crypto@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 04/12] soc: fsl: dpio: add congestion notification support

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).

Acked-by: Li Yang <leoyang.li@....com>
Signed-off-by: Horia Geantă <horia.geanta@....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