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Subject[tip: irq/msi] bus: fsl-mc-msi: Simplify MSI descriptor handling
The following commit has been merged into the irq/msi branch of tip:

Commit-ID: e8604b1447b4a0c178019bdf809a4d52e1c235b6
Gitweb: https://git.kernel.org/tip/e8604b1447b4a0c178019bdf809a4d52e1c235b6
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Mon, 06 Dec 2021 23:51:39 +01:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Thu, 16 Dec 2021 22:22:19 +01:00

bus: fsl-mc-msi: Simplify MSI descriptor handling

Let the MSI irq domain code handle descriptor allocation and free.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20211206210748.847219474@linutronix.de

---
drivers/bus/fsl-mc/fsl-mc-msi.c | 61 ++------------------------------
1 file changed, 4 insertions(+), 57 deletions(-)

diff --git a/drivers/bus/fsl-mc/fsl-mc-msi.c b/drivers/bus/fsl-mc/fsl-mc-msi.c
index 4823947..5e0e439 100644
--- a/drivers/bus/fsl-mc/fsl-mc-msi.c
+++ b/drivers/bus/fsl-mc/fsl-mc-msi.c
@@ -170,6 +170,7 @@ struct irq_domain *fsl_mc_msi_create_irq_domain(struct fwnode_handle *fwnode,
fsl_mc_msi_update_dom_ops(info);
if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
fsl_mc_msi_update_chip_ops(info);
+ info->flags |= MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS | MSI_FLAG_FREE_MSI_DESCS;

domain = msi_create_irq_domain(fwnode, info, parent);
if (domain)
@@ -210,45 +211,7 @@ struct irq_domain *fsl_mc_find_msi_domain(struct device *dev)
return msi_domain;
}

-static void fsl_mc_msi_free_descs(struct device *dev)
-{
- struct msi_desc *desc, *tmp;
-
- list_for_each_entry_safe(desc, tmp, dev_to_msi_list(dev), list) {
- list_del(&desc->list);
- free_msi_entry(desc);
- }
-}
-
-static int fsl_mc_msi_alloc_descs(struct device *dev, unsigned int irq_count)
-
-{
- unsigned int i;
- int error;
- struct msi_desc *msi_desc;
-
- for (i = 0; i < irq_count; i++) {
- msi_desc = alloc_msi_entry(dev, 1, NULL);
- if (!msi_desc) {
- dev_err(dev, "Failed to allocate msi entry\n");
- error = -ENOMEM;
- goto cleanup_msi_descs;
- }
-
- msi_desc->msi_index = i;
- INIT_LIST_HEAD(&msi_desc->list);
- list_add_tail(&msi_desc->list, dev_to_msi_list(dev));
- }
-
- return 0;
-
-cleanup_msi_descs:
- fsl_mc_msi_free_descs(dev);
- return error;
-}
-
-int fsl_mc_msi_domain_alloc_irqs(struct device *dev,
- unsigned int irq_count)
+int fsl_mc_msi_domain_alloc_irqs(struct device *dev, unsigned int irq_count)
{
struct irq_domain *msi_domain;
int error;
@@ -261,28 +224,17 @@ int fsl_mc_msi_domain_alloc_irqs(struct device *dev,
if (error)
return error;

- if (!list_empty(dev_to_msi_list(dev)))
+ if (msi_first_desc(dev, MSI_DESC_ALL))
return -EINVAL;

- error = fsl_mc_msi_alloc_descs(dev, irq_count);
- if (error < 0)
- return error;
-
/*
* NOTE: Calling this function will trigger the invocation of the
* its_fsl_mc_msi_prepare() callback
*/
error = msi_domain_alloc_irqs(msi_domain, dev, irq_count);

- if (error) {
+ if (error)
dev_err(dev, "Failed to allocate IRQs\n");
- goto cleanup_msi_descs;
- }
-
- return 0;
-
-cleanup_msi_descs:
- fsl_mc_msi_free_descs(dev);
return error;
}

@@ -295,9 +247,4 @@ void fsl_mc_msi_domain_free_irqs(struct device *dev)
return;

msi_domain_free_irqs(msi_domain, dev);
-
- if (list_empty(dev_to_msi_list(dev)))
- return;
-
- fsl_mc_msi_free_descs(dev);
}
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