linux-kernel - [PATCH v3] fpga: dfl: check feature type before parse irq info

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Message-Id: <20220311021121.1504442-1-tianfei.zhang@intel.com>
Date:   Thu, 10 Mar 2022 21:11:21 -0500
From:   Tianfei Zhang <tianfei.zhang@...el.com>
To:     hao.wu@...el.com, trix@...hat.com, mdf@...nel.org,
        yilun.xu@...el.com, linux-fpga@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     corbet@....net, Tianfei Zhang <tianfei.zhang@...el.com>
Subject: [PATCH v3] fpga: dfl: check feature type before parse irq info

The feature ID of "Port User Interrupt" and the
"PMCI Subsystem" are identical, 0x12, but one is for FME,
other is for Port. It should check the feature type While
parsing the irq info in parse_feature_irqs().

---
v3: Remove "Fixes" in commit log with Hao's comment, this is a
    extension not a bug fix.

v2: add DFL Feature ID Registry in documentation.

Signed-off-by: Tianfei Zhang <tianfei.zhang@...el.com>
---
 Documentation/fpga/dfl.rst | 11 +++++++++++
 drivers/fpga/dfl.c         | 38 ++++++++++++++++++++++----------------
 2 files changed, 33 insertions(+), 16 deletions(-)

diff --git a/Documentation/fpga/dfl.rst b/Documentation/fpga/dfl.rst
index ef9eec71f6f3..14f342bb85e4 100644
--- a/Documentation/fpga/dfl.rst
+++ b/Documentation/fpga/dfl.rst
@@ -502,6 +502,17 @@ Developer only needs to provide a sub feature driver with matched feature id.
 FME Partial Reconfiguration Sub Feature driver (see drivers/fpga/dfl-fme-pr.c)
 could be a reference.
 
+Individual DFL drivers are bound DFL devices based on Feature Type and Feature ID.
+The definition of Feature Type and Feature ID can be found:
+
+https://github.com/OPAE/linux-dfl-feature-id/blob/master/dfl-feature-ids.rst
+
+If you want to add a new feature ID for FPGA DFL feature device, we recommend that
+use a pull request to reserve a feature ID for DFL. Here is the DFL Feature ID
+Registry:
+
+https://github.com/OPAE/linux-dfl-feature-id
+
 Location of DFLs on a PCI Device
 ================================
 The original method for finding a DFL on a PCI device assumed the start of the
diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
index 599bb21d86af..6bff39ff21a0 100644
--- a/drivers/fpga/dfl.c
+++ b/drivers/fpga/dfl.c
@@ -940,9 +940,12 @@ static int parse_feature_irqs(struct build_feature_devs_info *binfo,
 {
 	void __iomem *base = binfo->ioaddr + ofst;
 	unsigned int i, ibase, inr = 0;
+	enum dfl_id_type type;
 	int virq;
 	u64 v;
 
+	type = feature_dev_id_type(binfo->feature_dev);
+
 	/*
 	 * Ideally DFL framework should only read info from DFL header, but
 	 * current version DFL only provides mmio resources information for
@@ -957,22 +960,25 @@ static int parse_feature_irqs(struct build_feature_devs_info *binfo,
 	 * code will be added. But in order to be compatible to old version
 	 * DFL, the driver may still fall back to these quirks.
 	 */
-	switch (fid) {
-	case PORT_FEATURE_ID_UINT:
-		v = readq(base + PORT_UINT_CAP);
-		ibase = FIELD_GET(PORT_UINT_CAP_FST_VECT, v);
-		inr = FIELD_GET(PORT_UINT_CAP_INT_NUM, v);
-		break;
-	case PORT_FEATURE_ID_ERROR:
-		v = readq(base + PORT_ERROR_CAP);
-		ibase = FIELD_GET(PORT_ERROR_CAP_INT_VECT, v);
-		inr = FIELD_GET(PORT_ERROR_CAP_SUPP_INT, v);
-		break;
-	case FME_FEATURE_ID_GLOBAL_ERR:
-		v = readq(base + FME_ERROR_CAP);
-		ibase = FIELD_GET(FME_ERROR_CAP_INT_VECT, v);
-		inr = FIELD_GET(FME_ERROR_CAP_SUPP_INT, v);
-		break;
+	if (type == PORT_ID) {
+		switch (fid) {
+		case PORT_FEATURE_ID_UINT:
+			v = readq(base + PORT_UINT_CAP);
+			ibase = FIELD_GET(PORT_UINT_CAP_FST_VECT, v);
+			inr = FIELD_GET(PORT_UINT_CAP_INT_NUM, v);
+			break;
+		case PORT_FEATURE_ID_ERROR:
+			v = readq(base + PORT_ERROR_CAP);
+			ibase = FIELD_GET(PORT_ERROR_CAP_INT_VECT, v);
+			inr = FIELD_GET(PORT_ERROR_CAP_SUPP_INT, v);
+			break;
+		}
+	} else if (type == FME_ID) {
+		if (fid == FME_FEATURE_ID_GLOBAL_ERR) {
+			v = readq(base + FME_ERROR_CAP);
+			ibase = FIELD_GET(FME_ERROR_CAP_INT_VECT, v);
+			inr = FIELD_GET(FME_ERROR_CAP_SUPP_INT, v);
+		}
 	}
 
 	if (!inr) {
-- 
2.26.2