linux-kernel - [PATCH v2 4/4] fpga: remove compat_id from fpga_manager and fpga

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Date:   Fri,  9 Jul 2021 06:42:29 -0700
From:   trix@...hat.com
To:     mdf@...nel.org, corbet@....net, hao.wu@...el.com
Cc:     linux-fpga@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Tom Rix <trix@...hat.com>
Subject: [PATCH v2 4/4] fpga: remove compat_id from fpga_manager and fpga_region

From: Tom Rix <trix@...hat.com>

compat_id is implementation specific.  So the data should be
stored at the implemeation layer, not the infrastructure layer.
Remove the compat_id elements and supporting code.

Printing out the compat_id is done with the fpga_region
compat_id_show() op.

Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/fpga/dfl-fme-mgr.c       |  7 -------
 drivers/fpga/dfl-fme-region.c    |  1 -
 drivers/fpga/fpga-region.c       |  7 +------
 include/linux/fpga/fpga-mgr.h    | 13 -------------
 include/linux/fpga/fpga-region.h |  2 --
 5 files changed, 1 insertion(+), 29 deletions(-)

diff --git a/drivers/fpga/dfl-fme-mgr.c b/drivers/fpga/dfl-fme-mgr.c
index cd0b9157ea6e5..8c5423eeffe75 100644
--- a/drivers/fpga/dfl-fme-mgr.c
+++ b/drivers/fpga/dfl-fme-mgr.c
@@ -292,7 +292,6 @@ EXPORT_SYMBOL_GPL(fme_mgr_get_compat_id);
 static int fme_mgr_probe(struct platform_device *pdev)
 {
 	struct dfl_fme_mgr_pdata *pdata = dev_get_platdata(&pdev->dev);
-	struct fpga_compat_id *compat_id;
 	struct device *dev = &pdev->dev;
 	struct fme_mgr_priv *priv;
 	struct fpga_manager *mgr;
@@ -312,10 +311,6 @@ static int fme_mgr_probe(struct platform_device *pdev)
 			return PTR_ERR(priv->ioaddr);
 	}
 
-	compat_id = devm_kzalloc(dev, sizeof(*compat_id), GFP_KERNEL);
-	if (!compat_id)
-		return -ENOMEM;
-
 	_fme_mgr_get_compat_id(priv->ioaddr, &priv->compat_id);
 
 	mgr = devm_fpga_mgr_create(dev, "DFL FME FPGA Manager",
@@ -323,8 +318,6 @@ static int fme_mgr_probe(struct platform_device *pdev)
 	if (!mgr)
 		return -ENOMEM;
 
-	mgr->compat_id = compat_id;
-
 	return devm_fpga_mgr_register(dev, mgr);
 }
 
diff --git a/drivers/fpga/dfl-fme-region.c b/drivers/fpga/dfl-fme-region.c
index d21eacbf2469f..be1d57ee37666 100644
--- a/drivers/fpga/dfl-fme-region.c
+++ b/drivers/fpga/dfl-fme-region.c
@@ -64,7 +64,6 @@ static int fme_region_probe(struct platform_device *pdev)
 	}
 
 	region->priv = pdata;
-	region->compat_id = mgr->compat_id;
 	platform_set_drvdata(pdev, region);
 
 	ret = fpga_region_register(region);
diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c
index 864dd4f290e3b..b08d3914716f0 100644
--- a/drivers/fpga/fpga-region.c
+++ b/drivers/fpga/fpga-region.c
@@ -172,12 +172,7 @@ static ssize_t compat_id_show(struct device *dev,
 	if (region->rops && region->rops->compat_id_show)
 		return region->rops->compat_id_show(region, buf);
 
-	if (!region->compat_id)
-		return -ENOENT;
-
-	return sprintf(buf, "%016llx%016llx\n",
-		       (unsigned long long)region->compat_id->id_h,
-		       (unsigned long long)region->compat_id->id_l);
+	return -ENOENT;
 }
 
 static DEVICE_ATTR_RO(compat_id);
diff --git a/include/linux/fpga/fpga-mgr.h b/include/linux/fpga/fpga-mgr.h
index ec2cd8bfceb00..ebdea215a8643 100644
--- a/include/linux/fpga/fpga-mgr.h
+++ b/include/linux/fpga/fpga-mgr.h
@@ -143,24 +143,12 @@ struct fpga_manager_ops {
 #define FPGA_MGR_STATUS_IP_PROTOCOL_ERR		BIT(3)
 #define FPGA_MGR_STATUS_FIFO_OVERFLOW_ERR	BIT(4)
 
-/**
- * struct fpga_compat_id - id for compatibility check
- *
- * @id_h: high 64bit of the compat_id
- * @id_l: low 64bit of the compat_id
- */
-struct fpga_compat_id {
-	u64 id_h;
-	u64 id_l;
-};
-
 /**
  * struct fpga_manager - fpga manager structure
  * @name: name of low level fpga manager
  * @dev: fpga manager device
  * @ref_mutex: only allows one reference to fpga manager
  * @state: state of fpga manager
- * @compat_id: FPGA manager id for compatibility check.
  * @mops: pointer to struct of fpga manager ops
  * @priv: low level driver private date
  */
@@ -169,7 +157,6 @@ struct fpga_manager {
 	struct device dev;
 	struct mutex ref_mutex;
 	enum fpga_mgr_states state;
-	struct fpga_compat_id *compat_id;
 	const struct fpga_manager_ops *mops;
 	void *priv;
 };
diff --git a/include/linux/fpga/fpga-region.h b/include/linux/fpga/fpga-region.h
index 236d3819f1c13..afc79784b2823 100644
--- a/include/linux/fpga/fpga-region.h
+++ b/include/linux/fpga/fpga-region.h
@@ -30,7 +30,6 @@ struct fpga_region_ops {
  * @bridge_list: list of FPGA bridges specified in region
  * @mgr: FPGA manager
  * @info: FPGA image info
- * @compat_id: FPGA region id for compatibility check.
  * @priv: private data
  * @rops: optional pointer to struct for fpga region ops
  */
@@ -40,7 +39,6 @@ struct fpga_region {
 	struct list_head bridge_list;
 	struct fpga_manager *mgr;
 	struct fpga_image_info *info;
-	struct fpga_compat_id *compat_id;
 	void *priv;
 	const struct fpga_region_ops *rops;
 };
-- 
2.26.3