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Message-ID: <1606324841-217570-5-git-send-email-john.garry@huawei.com>
Date: Thu, 26 Nov 2020 01:20:40 +0800
From: John Garry <john.garry@...wei.com>
To: <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>,
<lenb@...nel.org>, <rjw@...ysocki.net>,
<gregkh@...uxfoundation.org>, <tglx@...utronix.de>
CC: <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linuxarm@...wei.com>, <linux-acpi@...r.kernel.org>,
<maz@...nel.org>, "John Garry" <john.garry@...wei.com>
Subject: [PATCH v3 4/5] Driver core: platform: Add devm_platform_get_irqs_affinity()
Drivers for multi-queue platform devices may also want managed interrupts
for handling HW queue completion interrupts, so add support.
The function accepts an affinity descriptor pointer, which covers a set
of irqs for the device.
The reason a devm method is added - as opposed to non-devm - is because the
only current in-tree user will also use devm method for requesting the
interrupts; as such, the function is made as devm as it can ensure ordering
of freeing the irq and disposing of the mapping.
Signed-off-by: John Garry <john.garry@...wei.com>
---
drivers/base/platform.c | 114 +++++++++++++++++++++++++++++++-
include/linux/platform_device.h | 6 ++
2 files changed, 119 insertions(+), 1 deletion(-)
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 3eeda3746701..08f4175c4ac8 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -15,6 +15,7 @@
#include <linux/of_irq.h>
#include <linux/module.h>
#include <linux/init.h>
+#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/memblock.h>
#include <linux/err.h>
@@ -289,7 +290,7 @@ int platform_irq_count(struct platform_device *dev)
}
EXPORT_SYMBOL_GPL(platform_irq_count);
-void platform_put_irq(struct platform_device *dev, unsigned int num)
+static void platform_put_irq(struct platform_device *dev, unsigned int num)
{
unsigned int virq = platform_get_irq(dev, num);
@@ -303,6 +304,117 @@ void platform_put_irq(struct platform_device *dev, unsigned int num)
}
}
+struct irq_affinity_devres {
+ unsigned int count;
+ void *dev_id;
+ unsigned int irq[];
+};
+
+static void devm_platform_get_irqs_affinity_release(struct device *dev,
+ void *res)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct irq_affinity_devres *ptr = res;
+ int i;
+
+ for (i = 0; i < ptr->count; i++)
+ platform_put_irq(pdev, i);
+}
+
+/**
+ * devm_platform_get_irqs_affinity - devm method to get a set of IRQs for a
+ * device using an interrupt affinity descriptor
+ * @dev: platform device pointer
+ * @affd: affinity descriptor
+ * @minvec: minimum count of interrupt vectors
+ * @maxvec: maximum count of interrupt vectors
+ * @irqs: pointer holder for IRQ numbers
+ *
+ * Gets a set of IRQs for a platform device, and updates IRQ afffinty according
+ * to the passed affinity descriptor
+ *
+ * Return: Number of vectors on success, negative error number on failure.
+ */
+int devm_platform_get_irqs_affinity(struct platform_device *dev,
+ struct irq_affinity *affd,
+ unsigned int minvec,
+ unsigned int maxvec,
+ int **irqs)
+{
+ struct irq_affinity_devres *ptr;
+ struct irq_affinity_desc *desc;
+ size_t size;
+ int i, ret, nvec;
+
+ if (!affd)
+ return -EPERM;
+
+ if (maxvec < minvec)
+ return -ERANGE;
+
+ nvec = platform_irq_count(dev);
+
+ if (nvec < minvec)
+ return -ENOSPC;
+
+ if (nvec <= affd->pre_vectors + affd->post_vectors)
+ return -EIO;
+
+ nvec = irq_calc_affinity_vectors(minvec, nvec, affd);
+ if (nvec < minvec)
+ return -ENOSPC;
+
+ if (nvec > maxvec)
+ nvec = maxvec;
+
+ size = sizeof(*ptr) + sizeof(unsigned int) * nvec;
+ ptr = devres_alloc(devm_platform_get_irqs_affinity_release, size,
+ GFP_KERNEL);
+ if (!ptr)
+ return -ENOMEM;
+
+ ptr->count = nvec;
+
+ for (i = 0; i < nvec; i++) {
+ int irq = platform_get_irq(dev, i);
+ if (irq < 0) {
+ ret = irq;
+ goto err_free_devres;
+ }
+ ptr->irq[i] = irq;
+ }
+
+ desc = irq_create_affinity_masks(nvec, affd);
+ if (!desc) {
+ ret = -ENOMEM;
+ goto err_free_devres;
+ }
+
+ for (i = 0; i < nvec; i++) {
+ ret = irq_update_affinity_desc(ptr->irq[i], &desc[i]);
+ if (ret) {
+ dev_err(&dev->dev, "failed to update irq%d affinity descriptor (%d)\n",
+ ptr->irq[i], ret);
+ goto err_free_desc;
+ }
+ }
+
+ devres_add(&dev->dev, ptr);
+
+ kfree(desc);
+
+ *irqs = ptr->irq;
+
+ return nvec;
+
+err_free_desc:
+ kfree(desc);
+err_free_devres:
+ devres_free(ptr);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(devm_platform_get_irqs_affinity);
+
/**
* platform_get_resource_byname - get a resource for a device by name
* @dev: platform device
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index 77a2aada106d..4d75633e6735 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -15,6 +15,7 @@
#define PLATFORM_DEVID_NONE (-1)
#define PLATFORM_DEVID_AUTO (-2)
+struct irq_affinity;
struct mfd_cell;
struct property_entry;
struct platform_device_id;
@@ -70,6 +71,11 @@ devm_platform_ioremap_resource_byname(struct platform_device *pdev,
extern int platform_get_irq(struct platform_device *, unsigned int);
extern int platform_get_irq_optional(struct platform_device *, unsigned int);
extern int platform_irq_count(struct platform_device *);
+extern int devm_platform_get_irqs_affinity(struct platform_device *dev,
+ struct irq_affinity *affd,
+ unsigned int minvec,
+ unsigned int maxvec,
+ int **irqs);
extern struct resource *platform_get_resource_byname(struct platform_device *,
unsigned int,
const char *);
--
2.26.2
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