[patch V2 12/36] platform-msi: Store platform private data pointer in msi_device_data

Thomas Gleixner
2021-12-06T22:39:35Z

Storing the platform private data in a MSI descriptor is sloppy at
best. The data belongs to the device and not to the descriptor.
Add a pointer to struct msi_device_data and store the pointer there.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
---
drivers/base/platform-msi.c | 79 +++++++++++++++++---------------------------
include/linux/msi.h | 4 +-
2 files changed, 34 insertions(+), 49 deletions(-)

--- a/drivers/base/platform-msi.c
+++ b/drivers/base/platform-msi.c
@@ -38,9 +38,7 @@ static DEFINE_IDA(platform_msi_devid_ida
*/
static irq_hw_number_t platform_msi_calc_hwirq(struct msi_desc *desc)
{
- u32 devid;
-
- devid = desc->platform.msi_priv_data->devid;
+ u32 devid = desc->dev->msi.data->platform_data->devid;

return (devid << (32 - DEV_ID_SHIFT)) | desc->platform.msi_index;
}
@@ -85,11 +83,8 @@ static void platform_msi_update_dom_ops(
static void platform_msi_write_msg(struct irq_data *data, struct msi_msg *msg)
{
struct msi_desc *desc = irq_data_get_msi_desc(data);
- struct platform_msi_priv_data *priv_data;
-
- priv_data = desc->platform.msi_priv_data;

- priv_data->write_msg(desc, msg);
+ desc->dev->msi.data->platform_data->write_msg(desc, msg);
}

static void platform_msi_update_chip_ops(struct msi_domain_info *info)
@@ -126,9 +121,7 @@ static void platform_msi_free_descs(stru
}

static int platform_msi_alloc_descs_with_irq(struct device *dev, int virq,
- int nvec,
- struct platform_msi_priv_data *data)
-
+ int nvec)
{
struct msi_desc *desc;
int i, base = 0;
@@ -144,7 +137,6 @@ static int platform_msi_alloc_descs_with
if (!desc)
break;

- desc->platform.msi_priv_data = data;
desc->platform.msi_index = base + i;
desc->irq = virq ? virq + i : 0;

@@ -161,11 +153,9 @@ static int platform_msi_alloc_descs_with
return 0;
}

-static int platform_msi_alloc_descs(struct device *dev, int nvec,
- struct platform_msi_priv_data *data)
-
+static int platform_msi_alloc_descs(struct device *dev, int nvec)
{
- return platform_msi_alloc_descs_with_irq(dev, 0, nvec, data);
+ return platform_msi_alloc_descs_with_irq(dev, 0, nvec);
}

/**
@@ -199,9 +189,8 @@ struct irq_domain *platform_msi_create_i
return domain;
}

-static struct platform_msi_priv_data *
-platform_msi_alloc_priv_data(struct device *dev, unsigned int nvec,
- irq_write_msi_msg_t write_msi_msg)
+static int platform_msi_alloc_priv_data(struct device *dev, unsigned int nvec,
+ irq_write_msi_msg_t write_msi_msg)
{
struct platform_msi_priv_data *datap;
int err;
@@ -213,41 +202,44 @@ platform_msi_alloc_priv_data(struct devi
* capable devices).
*/
if (!dev->msi.domain || !write_msi_msg || !nvec || nvec > MAX_DEV_MSIS)
- return ERR_PTR(-EINVAL);
+ return -EINVAL;

if (dev->msi.domain->bus_token != DOMAIN_BUS_PLATFORM_MSI) {
dev_err(dev, "Incompatible msi_domain, giving up\n");
- return ERR_PTR(-EINVAL);
+ return -EINVAL;
}

err = msi_setup_device_data(dev);
if (err)
- return ERR_PTR(err);
+ return err;

- /* Already had a helping of MSI? Greed... */
- if (!list_empty(dev_to_msi_list(dev)))
- return ERR_PTR(-EBUSY);
+ /* Already initialized? */
+ if (dev->msi.data->platform_data)
+ return -EBUSY;

datap = kzalloc(sizeof(*datap), GFP_KERNEL);
if (!datap)
- return ERR_PTR(-ENOMEM);
+ return -ENOMEM;

datap->devid = ida_simple_get(&platform_msi_devid_ida,
0, 1 << DEV_ID_SHIFT, GFP_KERNEL);
if (datap->devid < 0) {
err = datap->devid;
kfree(datap);
- return ERR_PTR(err);
+ return err;
}

datap->write_msg = write_msi_msg;
datap->dev = dev;
-
- return datap;
+ dev->msi.data->platform_data = datap;
+ return 0;
}

-static void platform_msi_free_priv_data(struct platform_msi_priv_data *data)
+static void platform_msi_free_priv_data(struct device *dev)
{
+ struct platform_msi_priv_data *data = dev->msi.data->platform_data;
+
+ dev->msi.data->platform_data = NULL;
ida_simple_remove(&platform_msi_devid_ida, data->devid);
kfree(data);
}
@@ -264,14 +256,13 @@ static void platform_msi_free_priv_data(
int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
irq_write_msi_msg_t write_msi_msg)
{
- struct platform_msi_priv_data *priv_data;
int err;

- priv_data = platform_msi_alloc_priv_data(dev, nvec, write_msi_msg);
- if (IS_ERR(priv_data))
- return PTR_ERR(priv_data);
+ err = platform_msi_alloc_priv_data(dev, nvec, write_msi_msg);
+ if (err)
+ return err;

- err = platform_msi_alloc_descs(dev, nvec, priv_data);
+ err = platform_msi_alloc_descs(dev, nvec);
if (err)
goto out_free_priv_data;

@@ -284,8 +275,7 @@ int platform_msi_domain_alloc_irqs(struc
out_free_desc:
platform_msi_free_descs(dev, 0, nvec);
out_free_priv_data:
- platform_msi_free_priv_data(priv_data);
-
+ platform_msi_free_priv_data(dev);
return err;
}
EXPORT_SYMBOL_GPL(platform_msi_domain_alloc_irqs);
@@ -296,15 +286,9 @@ EXPORT_SYMBOL_GPL(platform_msi_domain_al
*/
void platform_msi_domain_free_irqs(struct device *dev)
{
- if (!list_empty(dev_to_msi_list(dev))) {
- struct msi_desc *desc;
-
- desc = first_msi_entry(dev);
- platform_msi_free_priv_data(desc->platform.msi_priv_data);
- }
-
msi_domain_free_irqs(dev->msi.domain, dev);
platform_msi_free_descs(dev, 0, MAX_DEV_MSIS);
+ platform_msi_free_priv_data(dev);
}
EXPORT_SYMBOL_GPL(platform_msi_domain_free_irqs);

@@ -351,10 +335,11 @@ struct irq_domain *
struct irq_domain *domain;
int err;

- data = platform_msi_alloc_priv_data(dev, nvec, write_msi_msg);
- if (IS_ERR(data))
+ err = platform_msi_alloc_priv_data(dev, nvec, write_msi_msg);
+ if (err)
return NULL;

+ data = dev->msi.data->platform_data;
data->host_data = host_data;
domain = irq_domain_create_hierarchy(dev->msi.domain, 0,
is_tree ? 0 : nvec,
@@ -372,7 +357,7 @@ struct irq_domain *
free_domain:
irq_domain_remove(domain);
free_priv:
- platform_msi_free_priv_data(data);
+ platform_msi_free_priv_data(dev);
return NULL;
}

@@ -420,7 +405,7 @@ int platform_msi_device_domain_alloc(str
struct platform_msi_priv_data *data = domain->host_data;
int err;

- err = platform_msi_alloc_descs_with_irq(data->dev, virq, nr_irqs, data);
+ err = platform_msi_alloc_descs_with_irq(data->dev, virq, nr_irqs);
if (err)
return err;

--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -108,11 +108,9 @@ struct pci_msi_desc {

/**
* platform_msi_desc - Platform device specific msi descriptor data
- * @msi_priv_data: Pointer to platform private data
* @msi_index: The index of the MSI descriptor for multi MSI
*/
struct platform_msi_desc {
- struct platform_msi_priv_data *msi_priv_data;
u16 msi_index;
};

@@ -177,10 +175,12 @@ struct msi_desc {
* msi_device_data - MSI per device data
* @properties: MSI properties which are interesting to drivers
* @attrs: Pointer to the sysfs attribute group
+ * @platform_data: Platform-MSI specific data
*/
struct msi_device_data {
unsigned long properties;
const struct attribute_group **attrs;
+ struct platform_msi_priv_data *platform_data;
};

int msi_setup_device_data(struct device *dev);