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Subject[tip: irq/msi] platform-msi: Let core code handle MSI descriptors
The following commit has been merged into the irq/msi branch of tip:

Commit-ID: 653b50c5f96918238e0b51e783b291f6e9e692f9
Gitweb: https://git.kernel.org/tip/653b50c5f96918238e0b51e783b291f6e9e692f9
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Mon, 06 Dec 2021 23:51:41 +01:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Thu, 16 Dec 2021 22:22:19 +01:00

platform-msi: Let core code handle MSI descriptors

Use the core functionality for platform MSI interrupt domains. The platform
device MSI interrupt domains will be converted in a later step.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20211206210748.903173257@linutronix.de

---
drivers/base/platform-msi.c | 112 +++++++++++++++--------------------
1 file changed, 48 insertions(+), 64 deletions(-)

diff --git a/drivers/base/platform-msi.c b/drivers/base/platform-msi.c
index 88bdc4b..01c897c 100644
--- a/drivers/base/platform-msi.c
+++ b/drivers/base/platform-msi.c
@@ -107,57 +107,6 @@ static void platform_msi_update_chip_ops(struct msi_domain_info *info)
info->flags &= ~MSI_FLAG_LEVEL_CAPABLE;
}

-static void platform_msi_free_descs(struct device *dev, int base, int nvec)
-{
- struct msi_desc *desc, *tmp;
-
- list_for_each_entry_safe(desc, tmp, dev_to_msi_list(dev), list) {
- if (desc->msi_index >= base &&
- desc->msi_index < (base + nvec)) {
- list_del(&desc->list);
- free_msi_entry(desc);
- }
- }
-}
-
-static int platform_msi_alloc_descs_with_irq(struct device *dev, int virq,
- int nvec)
-{
- struct msi_desc *desc;
- int i, base = 0;
-
- if (!list_empty(dev_to_msi_list(dev))) {
- desc = list_last_entry(dev_to_msi_list(dev),
- struct msi_desc, list);
- base = desc->msi_index + 1;
- }
-
- for (i = 0; i < nvec; i++) {
- desc = alloc_msi_entry(dev, 1, NULL);
- if (!desc)
- break;
-
- desc->msi_index = base + i;
- desc->irq = virq ? virq + i : 0;
-
- list_add_tail(&desc->list, dev_to_msi_list(dev));
- }
-
- if (i != nvec) {
- /* Clean up the mess */
- platform_msi_free_descs(dev, base, nvec);
-
- return -ENOMEM;
- }
-
- return 0;
-}
-
-static int platform_msi_alloc_descs(struct device *dev, int nvec)
-{
- return platform_msi_alloc_descs_with_irq(dev, 0, nvec);
-}
-
/**
* platform_msi_create_irq_domain - Create a platform MSI interrupt domain
* @fwnode: Optional fwnode of the interrupt controller
@@ -180,7 +129,8 @@ struct irq_domain *platform_msi_create_irq_domain(struct fwnode_handle *fwnode,
platform_msi_update_dom_ops(info);
if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
platform_msi_update_chip_ops(info);
- info->flags |= MSI_FLAG_DEV_SYSFS;
+ info->flags |= MSI_FLAG_DEV_SYSFS | MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS |
+ MSI_FLAG_FREE_MSI_DESCS;

domain = msi_create_irq_domain(fwnode, info, parent);
if (domain)
@@ -262,20 +212,10 @@ int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
if (err)
return err;

- err = platform_msi_alloc_descs(dev, nvec);
- if (err)
- goto out_free_priv_data;
-
err = msi_domain_alloc_irqs(dev->msi.domain, dev, nvec);
if (err)
- goto out_free_desc;
-
- return 0;
+ platform_msi_free_priv_data(dev);

-out_free_desc:
- platform_msi_free_descs(dev, 0, nvec);
-out_free_priv_data:
- platform_msi_free_priv_data(dev);
return err;
}
EXPORT_SYMBOL_GPL(platform_msi_domain_alloc_irqs);
@@ -287,7 +227,6 @@ EXPORT_SYMBOL_GPL(platform_msi_domain_alloc_irqs);
void platform_msi_domain_free_irqs(struct device *dev)
{
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);
@@ -361,6 +300,51 @@ free_priv:
return NULL;
}

+static void platform_msi_free_descs(struct device *dev, int base, int nvec)
+{
+ struct msi_desc *desc, *tmp;
+
+ list_for_each_entry_safe(desc, tmp, dev_to_msi_list(dev), list) {
+ if (desc->msi_index >= base &&
+ desc->msi_index < (base + nvec)) {
+ list_del(&desc->list);
+ free_msi_entry(desc);
+ }
+ }
+}
+
+static int platform_msi_alloc_descs_with_irq(struct device *dev, int virq,
+ int nvec)
+{
+ struct msi_desc *desc;
+ int i, base = 0;
+
+ if (!list_empty(dev_to_msi_list(dev))) {
+ desc = list_last_entry(dev_to_msi_list(dev),
+ struct msi_desc, list);
+ base = desc->msi_index + 1;
+ }
+
+ for (i = 0; i < nvec; i++) {
+ desc = alloc_msi_entry(dev, 1, NULL);
+ if (!desc)
+ break;
+
+ desc->msi_index = base + i;
+ desc->irq = virq + i;
+
+ list_add_tail(&desc->list, dev_to_msi_list(dev));
+ }
+
+ if (i != nvec) {
+ /* Clean up the mess */
+ platform_msi_free_descs(dev, base, nvec);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
/**
* platform_msi_device_domain_free - Free interrupts associated with a platform-msi
* device domain
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