[PATCH v2 07/16] fpga: region: get mgr early on

Alan Tull
2017-04-20T14:15:02Z

Get the FPGA manager during region creation.

This is a baby step in refactoring the FPGA region code to
separate out common FPGA region code from FPGA region
Device Tree overlay support.

Signed-off-by: Alan Tull <atull@kernel.org>
---
v2: split out from another patch
---
drivers/fpga/fpga-region.c | 45 +++++++++++++++++++++++----------------------
1 file changed, 23 insertions(+), 22 deletions(-)

diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c
index 6784357..7ff5426 100644
--- a/drivers/fpga/fpga-region.c
+++ b/drivers/fpga/fpga-region.c
@@ -31,12 +31,14 @@
* @dev: FPGA Region device
* @mutex: enforces exclusive reference to region
* @bridge_list: list of FPGA bridges specified in region
+ * @mgr: FPGA manager
* @info: fpga image specific information
*/
struct fpga_region {
struct device dev;
struct mutex mutex; /* for exclusive reference to region */
struct list_head bridge_list;
+ struct fpga_manager *mgr;
struct fpga_image_info *info;
};

@@ -123,7 +125,7 @@ static void fpga_region_put(struct fpga_region *region)

/**
* fpga_region_get_manager - get reference for FPGA manager
- * @region: FPGA region
+ * @np: device node of FPGA region
*
* Get FPGA Manager from "fpga-mgr" property or from ancestor region.
*
@@ -131,10 +133,8 @@ static void fpga_region_put(struct fpga_region *region)
*
* Return: fpga manager struct or IS_ERR() condition containing error code.
*/
-static struct fpga_manager *fpga_region_get_manager(struct fpga_region *region)
+static struct fpga_manager *fpga_region_get_manager(struct device_node *np)
{
- struct device *dev = &region->dev;
- struct device_node *np = dev->of_node;
struct device_node *mgr_node;
struct fpga_manager *mgr;

@@ -231,7 +231,6 @@ static int fpga_region_program_fpga(struct fpga_region *region,
struct device_node *overlay)
{
struct device *dev = &region->dev;
- struct fpga_manager *mgr;
int ret;

region = fpga_region_get(region);
@@ -240,17 +239,10 @@ static int fpga_region_program_fpga(struct fpga_region *region,
return PTR_ERR(region);
}

- mgr = fpga_region_get_manager(region);
- if (IS_ERR(mgr)) {
- dev_err(dev, "failed to get FPGA manager\n");
- ret = PTR_ERR(mgr);
- goto err_put_region;
- }
-
- ret = fpga_mgr_lock(mgr);
+ ret = fpga_mgr_lock(region->mgr);
if (ret) {
dev_err(dev, "FPGA manager is busy\n");
- goto err_put_mgr;
+ goto err_put_region;
}

ret = fpga_region_get_bridges(region, overlay);
@@ -265,7 +257,7 @@ static int fpga_region_program_fpga(struct fpga_region *region,
goto err_put_br;
}

- ret = fpga_mgr_load(mgr, region->info);
+ ret = fpga_mgr_load(region->mgr, region->info);
if (ret) {
dev_err(dev, "failed to load FPGA image\n");
goto err_put_br;
@@ -277,8 +269,7 @@ static int fpga_region_program_fpga(struct fpga_region *region,
goto err_put_br;
}

- fpga_mgr_unlock(mgr);
- fpga_mgr_put(mgr);
+ fpga_mgr_unlock(region->mgr);
fpga_region_put(region);

return 0;
@@ -286,9 +277,7 @@ static int fpga_region_program_fpga(struct fpga_region *region,
err_put_br:
fpga_bridges_put(&region->bridge_list);
err_unlock_mgr:
- fpga_mgr_unlock(mgr);
-err_put_mgr:
- fpga_mgr_put(mgr);
+ fpga_mgr_unlock(region->mgr);
err_put_region:
fpga_region_put(region);

@@ -517,11 +506,20 @@ static int fpga_region_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct fpga_region *region;
+ struct fpga_manager *mgr;
int id, ret = 0;

+ mgr = fpga_region_get_manager(np);
+ if (IS_ERR(mgr))
+ return -EPROBE_DEFER;
+
region = kzalloc(sizeof(*region), GFP_KERNEL);
- if (!region)
- return -ENOMEM;
+ if (!region) {
+ ret = -ENOMEM;
+ goto err_put_mgr;
+ }
+
+ region->mgr = mgr;

id = ida_simple_get(&fpga_region_ida, 0, 0, GFP_KERNEL);
if (id < 0) {
@@ -557,6 +555,8 @@ static int fpga_region_probe(struct platform_device *pdev)
ida_simple_remove(&fpga_region_ida, id);
err_kfree:
kfree(region);
+err_put_mgr:
+ fpga_mgr_put(mgr);

return ret;
}
@@ -566,6 +566,7 @@ static int fpga_region_remove(struct platform_device *pdev)
struct fpga_region *region = platform_get_drvdata(pdev);

device_unregister(&region->dev);
+ fpga_mgr_put(region->mgr);

return 0;
}
--
2.7.4