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Subject[PATCH 02/15] staging: gasket: core: move core PCI calls to device drivers
Date
From: Todd Poynor <toddpoynor@google.com>

Remove gasket wrapping of PCI probe, enable, disable, and remove
functions. Replace with calls to add and remove PCI gasket devices,
to be called by the gasket device drivers.

Signed-off-by: Todd Poynor <toddpoynor@google.com>
---
drivers/staging/gasket/gasket_core.c | 82 ++++++++--------------------
drivers/staging/gasket/gasket_core.h | 6 ++
2 files changed, 28 insertions(+), 60 deletions(-)

diff --git a/drivers/staging/gasket/gasket_core.c b/drivers/staging/gasket/gasket_core.c
index 2d209e36cf372..01cafe1ff6605 100644
--- a/drivers/staging/gasket/gasket_core.c
+++ b/drivers/staging/gasket/gasket_core.c
@@ -51,9 +51,6 @@ struct gasket_internal_desc {
/* Kernel-internal device class. */
struct class *class;

- /* PCI subsystem metadata associated with this driver. */
- struct pci_driver pci;
-
/* Instantiated / present devices of this type. */
struct gasket_dev *devs[GASKET_DEV_MAX];
};
@@ -368,10 +365,10 @@ static void gasket_unmap_pci_bar(struct gasket_dev *dev, int bar_num)
}

/*
- * Setup PCI & set up memory mapping for the specified device.
+ * Setup PCI memory mapping for the specified device.
*
- * Enables the PCI device, reads the BAR registers and sets up pointers to the
- * device's memory mapped IO space.
+ * Reads the BAR registers and sets up pointers to the device's memory mapped
+ * IO space.
*
* Returns 0 on success and a negative value otherwise.
*/
@@ -380,14 +377,6 @@ static int gasket_setup_pci(struct pci_dev *pci_dev,
{
int i, mapped_bars, ret;

- ret = pci_enable_device(pci_dev);
- if (ret) {
- dev_err(gasket_dev->dev, "cannot enable PCI device\n");
- return ret;
- }
-
- pci_set_master(pci_dev);
-
for (i = 0; i < GASKET_NUM_BARS; i++) {
ret = gasket_map_pci_bar(gasket_dev, i);
if (ret) {
@@ -402,19 +391,16 @@ static int gasket_setup_pci(struct pci_dev *pci_dev,
for (i = 0; i < mapped_bars; i++)
gasket_unmap_pci_bar(gasket_dev, i);

- pci_disable_device(pci_dev);
return -ENOMEM;
}

-/* Unmaps memory and cleans up PCI for the specified device. */
+/* Unmaps memory for the specified device. */
static void gasket_cleanup_pci(struct gasket_dev *gasket_dev)
{
int i;

for (i = 0; i < GASKET_NUM_BARS; i++)
gasket_unmap_pci_bar(gasket_dev, i);
-
- pci_disable_device(gasket_dev->pci_dev);
}

/* Determine the health of the Gasket device. */
@@ -1443,15 +1429,14 @@ static int gasket_enable_dev(struct gasket_internal_desc *internal_desc,
}

/*
- * PCI subsystem probe function.
- *
- * Called when a Gasket device is found. Allocates device metadata, maps device
- * memory, and calls gasket_enable_dev to prepare the device for active use.
+ * Add PCI gasket device.
*
- * Returns 0 if successful and a negative value otherwise.
+ * Called by Gasket device probe function.
+ * Allocates device metadata, maps device memory, and calls gasket_enable_dev
+ * to prepare the device for active use.
*/
-static int gasket_pci_probe(struct pci_dev *pci_dev,
- const struct pci_device_id *id)
+int gasket_pci_add_device(struct pci_dev *pci_dev,
+ struct gasket_dev **gasket_devp)
{
int ret;
const char *kobj_name = dev_name(&pci_dev->dev);
@@ -1460,13 +1445,14 @@ static int gasket_pci_probe(struct pci_dev *pci_dev,
const struct gasket_driver_desc *driver_desc;
struct device *parent;

- pr_info("Add Gasket device %s\n", kobj_name);
+ pr_debug("add PCI device %s\n", kobj_name);

mutex_lock(&g_mutex);
internal_desc = lookup_internal_desc(pci_dev);
mutex_unlock(&g_mutex);
if (!internal_desc) {
- pr_err("PCI probe called for unknown driver type\n");
+ dev_err(&pci_dev->dev,
+ "PCI add device called for unknown driver type\n");
return -ENODEV;
}

@@ -1530,6 +1516,7 @@ static int gasket_pci_probe(struct pci_dev *pci_dev,
goto fail5;
}

+ *gasket_devp = gasket_dev;
return 0;

fail5:
@@ -1545,14 +1532,10 @@ static int gasket_pci_probe(struct pci_dev *pci_dev,
gasket_free_dev(gasket_dev);
return ret;
}
+EXPORT_SYMBOL(gasket_pci_add_device);

-/*
- * PCI subsystem remove function.
- *
- * Called to remove a Gasket device. Finds the device in the device list and
- * cleans up metadata.
- */
-static void gasket_pci_remove(struct pci_dev *pci_dev)
+/* Remove a PCI gasket device. */
+void gasket_pci_remove_device(struct pci_dev *pci_dev)
{
int i;
struct gasket_internal_desc *internal_desc;
@@ -1583,8 +1566,8 @@ static void gasket_pci_remove(struct pci_dev *pci_dev)
if (!gasket_dev)
return;

- pr_info("remove %s device %s\n", internal_desc->driver_desc->name,
- gasket_dev->kobj_name);
+ dev_dbg(gasket_dev->dev, "remove %s PCI gasket device\n",
+ internal_desc->driver_desc->name);

gasket_disable_dev(gasket_dev);
gasket_cleanup_pci(gasket_dev);
@@ -1597,6 +1580,7 @@ static void gasket_pci_remove(struct pci_dev *pci_dev)
device_destroy(internal_desc->class, gasket_dev->dev_info.devt);
gasket_free_dev(gasket_dev);
}
+EXPORT_SYMBOL(gasket_pci_remove_device);

/**
* Lookup a name by number in a num_name table.
@@ -1770,11 +1754,6 @@ int gasket_register_device(const struct gasket_driver_desc *driver_desc)
internal = &g_descs[desc_idx];
mutex_init(&internal->mutex);
memset(internal->devs, 0, sizeof(struct gasket_dev *) * GASKET_DEV_MAX);
- memset(&internal->pci, 0, sizeof(internal->pci));
- internal->pci.name = driver_desc->name;
- internal->pci.id_table = driver_desc->pci_id_table;
- internal->pci.probe = gasket_pci_probe;
- internal->pci.remove = gasket_pci_remove;
internal->class =
class_create(driver_desc->module, driver_desc->name);

@@ -1785,33 +1764,18 @@ int gasket_register_device(const struct gasket_driver_desc *driver_desc)
goto unregister_gasket_driver;
}

- /*
- * Not using pci_register_driver() (without underscores), as it
- * depends on KBUILD_MODNAME, and this is a shared file.
- */
- ret = __pci_register_driver(&internal->pci, driver_desc->module,
- driver_desc->name);
- if (ret) {
- pr_err("cannot register %s pci driver [ret=%d]\n",
- driver_desc->name, ret);
- goto fail1;
- }
-
ret = register_chrdev_region(MKDEV(driver_desc->major,
driver_desc->minor), GASKET_DEV_MAX,
driver_desc->name);
if (ret) {
pr_err("cannot register %s char driver [ret=%d]\n",
driver_desc->name, ret);
- goto fail2;
+ goto destroy_class;
}

return 0;

-fail2:
- pci_unregister_driver(&internal->pci);
-
-fail1:
+destroy_class:
class_destroy(internal->class);

unregister_gasket_driver:
@@ -1848,8 +1812,6 @@ void gasket_unregister_device(const struct gasket_driver_desc *driver_desc)
unregister_chrdev_region(MKDEV(driver_desc->major, driver_desc->minor),
GASKET_DEV_MAX);

- pci_unregister_driver(&internal_desc->pci);
-
class_destroy(internal_desc->class);

/* Finally, effectively "remove" the driver. */
diff --git a/drivers/staging/gasket/gasket_core.h b/drivers/staging/gasket/gasket_core.h
index 67f5960943a8a..9f9bc66a0daa0 100644
--- a/drivers/staging/gasket/gasket_core.h
+++ b/drivers/staging/gasket/gasket_core.h
@@ -607,6 +607,12 @@ int gasket_register_device(const struct gasket_driver_desc *desc);
*/
void gasket_unregister_device(const struct gasket_driver_desc *desc);

+/* Add a PCI gasket device. */
+int gasket_pci_add_device(struct pci_dev *pci_dev,
+ struct gasket_dev **gasket_devp);
+/* Remove a PCI gasket device. */
+void gasket_pci_remove_device(struct pci_dev *pci_dev);
+
/*
* Reset the Gasket device.
* @gasket_dev: Gasket device struct.
--
2.18.0.597.ga71716f1ad-goog
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