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Subject[tip: irq/msi] genirq/msi: Move descriptor list to struct msi_device_data
The following commit has been merged into the irq/msi branch of tip:

Commit-ID: 125282cd4f33ecd53a24ae4807409da0e5e90fd4
Gitweb: https://git.kernel.org/tip/125282cd4f33ecd53a24ae4807409da0e5e90fd4
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Mon, 06 Dec 2021 23:51:04 +01:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Thu, 16 Dec 2021 22:22:16 +01:00

genirq/msi: Move descriptor list to struct msi_device_data

It's only required when MSI is in use.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20211206210747.650487479@linutronix.de

---
drivers/base/core.c | 3 ---
include/linux/device.h | 4 ----
include/linux/msi.h | 4 +++-
kernel/irq/msi.c | 5 ++++-
4 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index f26c668..f898786 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -2874,9 +2874,6 @@ void device_initialize(struct device *dev)
INIT_LIST_HEAD(&dev->devres_head);
device_pm_init(dev);
set_dev_node(dev, NUMA_NO_NODE);
-#ifdef CONFIG_GENERIC_MSI_IRQ
- INIT_LIST_HEAD(&dev->msi_list);
-#endif
INIT_LIST_HEAD(&dev->links.consumers);
INIT_LIST_HEAD(&dev->links.suppliers);
INIT_LIST_HEAD(&dev->links.defer_sync);
diff --git a/include/linux/device.h b/include/linux/device.h
index f0033cd..9345972 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -423,7 +423,6 @@ struct dev_msi_info {
* @pins: For device pin management.
* See Documentation/driver-api/pin-control.rst for details.
* @msi: MSI related data
- * @msi_list: Hosts MSI descriptors
* @numa_node: NUMA node this device is close to.
* @dma_ops: DMA mapping operations for this device.
* @dma_mask: Dma mask (if dma'ble device).
@@ -519,9 +518,6 @@ struct device {
struct dev_pin_info *pins;
#endif
struct dev_msi_info msi;
-#ifdef CONFIG_GENERIC_MSI_IRQ
- struct list_head msi_list;
-#endif
#ifdef CONFIG_DMA_OPS
const struct dma_map_ops *dma_ops;
#endif
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 7593fc3..4223e47 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -144,11 +144,13 @@ struct msi_desc {
* @properties: MSI properties which are interesting to drivers
* @attrs: Pointer to the sysfs attribute group
* @platform_data: Platform-MSI specific data
+ * @list: List of MSI descriptors associated to the device
*/
struct msi_device_data {
unsigned long properties;
const struct attribute_group **attrs;
struct platform_msi_priv_data *platform_data;
+ struct list_head list;
};

int msi_setup_device_data(struct device *dev);
@@ -157,7 +159,7 @@ unsigned int msi_get_virq(struct device *dev, unsigned int index);

/* Helpers to hide struct msi_desc implementation details */
#define msi_desc_to_dev(desc) ((desc)->dev)
-#define dev_to_msi_list(dev) (&(dev)->msi_list)
+#define dev_to_msi_list(dev) (&(dev)->msi.data->list)
#define first_msi_entry(dev) \
list_first_entry(dev_to_msi_list((dev)), struct msi_desc, list)
#define for_each_msi_entry(desc, dev) \
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index ab5e83f..c66787d 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -75,7 +75,9 @@ EXPORT_SYMBOL_GPL(get_cached_msi_msg);

static void msi_device_data_release(struct device *dev, void *res)
{
- WARN_ON_ONCE(!list_empty(&dev->msi_list));
+ struct msi_device_data *md = res;
+
+ WARN_ON_ONCE(!list_empty(&md->list));
dev->msi.data = NULL;
}

@@ -100,6 +102,7 @@ int msi_setup_device_data(struct device *dev)
if (!md)
return -ENOMEM;

+ INIT_LIST_HEAD(&md->list);
dev->msi.data = md;
devres_add(dev, md);
return 0;
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