Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2006-2008, Michael Ellerman, IBM Corporation.
 */
 
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/kmemleak.h>
#include <linux/bitmap.h>
#include <linux/memblock.h>
#include <asm/msi_bitmap.h>
#include <asm/setup.h>
 
int msi_bitmap_alloc_hwirqs(struct msi_bitmap *bmp, int num)
{
<------>unsigned long flags;
<------>int offset, order = get_count_order(num);
 
<------>spin_lock_irqsave(&bmp->lock, flags);
 
<------>offset = bitmap_find_next_zero_area(bmp->bitmap, bmp->irq_count, 0,
<------><------><------><------><------>    num, (1 << order) - 1);
<------>if (offset > bmp->irq_count)
<------><------>goto err;
 
<------>bitmap_set(bmp->bitmap, offset, num);
<------>spin_unlock_irqrestore(&bmp->lock, flags);
 
<------>pr_debug("msi_bitmap: allocated 0x%x at offset 0x%x\n", num, offset);
 
<------>return offset;
err:
<------>spin_unlock_irqrestore(&bmp->lock, flags);
<------>return -ENOMEM;
}
EXPORT_SYMBOL(msi_bitmap_alloc_hwirqs);
 
void msi_bitmap_free_hwirqs(struct msi_bitmap *bmp, unsigned int offset,
<------><------><------>    unsigned int num)
{
<------>unsigned long flags;
 
<------>pr_debug("msi_bitmap: freeing 0x%x at offset 0x%x\n",
<------><------> num, offset);
 
<------>spin_lock_irqsave(&bmp->lock, flags);
<------>bitmap_clear(bmp->bitmap, offset, num);
<------>spin_unlock_irqrestore(&bmp->lock, flags);
}
EXPORT_SYMBOL(msi_bitmap_free_hwirqs);
 
void msi_bitmap_reserve_hwirq(struct msi_bitmap *bmp, unsigned int hwirq)
{
<------>unsigned long flags;
 
<------>pr_debug("msi_bitmap: reserving hwirq 0x%x\n", hwirq);
 
<------>spin_lock_irqsave(&bmp->lock, flags);
<------>bitmap_allocate_region(bmp->bitmap, hwirq, 0);
<------>spin_unlock_irqrestore(&bmp->lock, flags);
}
 
/**
 * msi_bitmap_reserve_dt_hwirqs - Reserve irqs specified in the device tree.
 * @bmp: pointer to the MSI bitmap.
 *
 * Looks in the device tree to see if there is a property specifying which
 * irqs can be used for MSI. If found those irqs reserved in the device tree
 * are reserved in the bitmap.
 *
 * Returns 0 for success, < 0 if there was an error, and > 0 if no property
 * was found in the device tree.
 **/
int msi_bitmap_reserve_dt_hwirqs(struct msi_bitmap *bmp)
{
<------>int i, j, len;
<------>const u32 *p;
 
<------>if (!bmp->of_node)
<------><------>return 1;
 
<------>p = of_get_property(bmp->of_node, "msi-available-ranges", &len);
<------>if (!p) {
<------><------>pr_debug("msi_bitmap: no msi-available-ranges property " \
<------><------><------> "found on %pOF\n", bmp->of_node);
<------><------>return 1;
<------>}
 
<------>if (len % (2 * sizeof(u32)) != 0) {
<------><------>printk(KERN_WARNING "msi_bitmap: Malformed msi-available-ranges"
<------><------>       " property on %pOF\n", bmp->of_node);
<------><------>return -EINVAL;
<------>}
 
<------>bitmap_allocate_region(bmp->bitmap, 0, get_count_order(bmp->irq_count));
 
<------>spin_lock(&bmp->lock);
 
<------>/* Format is: (<u32 start> <u32 count>)+ */
<------>len /= 2 * sizeof(u32);
<------>for (i = 0; i < len; i++, p += 2) {
<------><------>for (j = 0; j < *(p + 1); j++)
<------><------><------>bitmap_release_region(bmp->bitmap, *p + j, 0);
<------>}
 
<------>spin_unlock(&bmp->lock);
 
<------>return 0;
}
 
int __ref msi_bitmap_alloc(struct msi_bitmap *bmp, unsigned int irq_count,
<------><------>     struct device_node *of_node)
{
<------>int size;
 
<------>if (!irq_count)
<------><------>return -EINVAL;
 
<------>size = BITS_TO_LONGS(irq_count) * sizeof(long);
<------>pr_debug("msi_bitmap: allocator bitmap size is 0x%x bytes\n", size);
 
<------>bmp->bitmap_from_slab = slab_is_available();
<------>if (bmp->bitmap_from_slab)
<------><------>bmp->bitmap = kzalloc(size, GFP_KERNEL);
<------>else {
<------><------>bmp->bitmap = memblock_alloc(size, SMP_CACHE_BYTES);
<------><------>if (!bmp->bitmap)
<------><------><------>panic("%s: Failed to allocate %u bytes\n", __func__,
<------><------><------>      size);
<------><------>/* the bitmap won't be freed from memblock allocator */
<------><------>kmemleak_not_leak(bmp->bitmap);
<------>}
 
<------>if (!bmp->bitmap) {
<------><------>pr_debug("msi_bitmap: ENOMEM allocating allocator bitmap!\n");
<------><------>return -ENOMEM;
<------>}
 
<------>/* We zalloc'ed the bitmap, so all irqs are free by default */
<------>spin_lock_init(&bmp->lock);
<------>bmp->of_node = of_node_get(of_node);
<------>bmp->irq_count = irq_count;
 
<------>return 0;
}
 
void msi_bitmap_free(struct msi_bitmap *bmp)
{
<------>if (bmp->bitmap_from_slab)
<------><------>kfree(bmp->bitmap);
<------>of_node_put(bmp->of_node);
<------>bmp->bitmap = NULL;
}
 
#ifdef CONFIG_MSI_BITMAP_SELFTEST
 
static void __init test_basics(void)
{
<------>struct msi_bitmap bmp;
<------>int rc, i, size = 512;
 
<------>/* Can't allocate a bitmap of 0 irqs */
<------>WARN_ON(msi_bitmap_alloc(&bmp, 0, NULL) == 0);
 
<------>/* of_node may be NULL */
<------>WARN_ON(msi_bitmap_alloc(&bmp, size, NULL));
 
<------>/* Should all be free by default */
<------>WARN_ON(bitmap_find_free_region(bmp.bitmap, size, get_count_order(size)));
<------>bitmap_release_region(bmp.bitmap, 0, get_count_order(size));
 
<------>/* With no node, there's no msi-available-ranges, so expect > 0 */
<------>WARN_ON(msi_bitmap_reserve_dt_hwirqs(&bmp) <= 0);
 
<------>/* Should all still be free */
<------>WARN_ON(bitmap_find_free_region(bmp.bitmap, size, get_count_order(size)));
<------>bitmap_release_region(bmp.bitmap, 0, get_count_order(size));
 
<------>/* Check we can fill it up and then no more */
<------>for (i = 0; i < size; i++)
<------><------>WARN_ON(msi_bitmap_alloc_hwirqs(&bmp, 1) < 0);
 
<------>WARN_ON(msi_bitmap_alloc_hwirqs(&bmp, 1) >= 0);
 
<------>/* Should all be allocated */
<------>WARN_ON(bitmap_find_free_region(bmp.bitmap, size, 0) >= 0);
 
<------>/* And if we free one we can then allocate another */
<------>msi_bitmap_free_hwirqs(&bmp, size / 2, 1);
<------>WARN_ON(msi_bitmap_alloc_hwirqs(&bmp, 1) != size / 2);
 
<------>/* Free most of them for the alignment tests */
<------>msi_bitmap_free_hwirqs(&bmp, 3, size - 3);
 
<------>/* Check we get a naturally aligned offset */
<------>rc = msi_bitmap_alloc_hwirqs(&bmp, 2);
<------>WARN_ON(rc < 0 && rc % 2 != 0);
<------>rc = msi_bitmap_alloc_hwirqs(&bmp, 4);
<------>WARN_ON(rc < 0 && rc % 4 != 0);
<------>rc = msi_bitmap_alloc_hwirqs(&bmp, 8);
<------>WARN_ON(rc < 0 && rc % 8 != 0);
<------>rc = msi_bitmap_alloc_hwirqs(&bmp, 9);
<------>WARN_ON(rc < 0 && rc % 16 != 0);
<------>rc = msi_bitmap_alloc_hwirqs(&bmp, 3);
<------>WARN_ON(rc < 0 && rc % 4 != 0);
<------>rc = msi_bitmap_alloc_hwirqs(&bmp, 7);
<------>WARN_ON(rc < 0 && rc % 8 != 0);
<------>rc = msi_bitmap_alloc_hwirqs(&bmp, 121);
<------>WARN_ON(rc < 0 && rc % 128 != 0);
 
<------>msi_bitmap_free(&bmp);
 
<------>/* Clients may WARN_ON bitmap == NULL for "not-allocated" */
<------>WARN_ON(bmp.bitmap != NULL);
}
 
static void __init test_of_node(void)
{
<------>u32 prop_data[] = { 10, 10, 25, 3, 40, 1, 100, 100, 200, 20 };
<------>const char *expected_str = "0-9,20-24,28-39,41-99,220-255";
<------>char *prop_name = "msi-available-ranges";
<------>char *node_name = "/fakenode";
<------>struct device_node of_node;
<------>struct property prop;
<------>struct msi_bitmap bmp;
#define SIZE_EXPECTED 256
<------>DECLARE_BITMAP(expected, SIZE_EXPECTED);
 
<------>/* There should really be a struct device_node allocator */
<------>memset(&of_node, 0, sizeof(of_node));
<------>of_node_init(&of_node);
<------>of_node.full_name = node_name;
 
<------>WARN_ON(msi_bitmap_alloc(&bmp, SIZE_EXPECTED, &of_node));
 
<------>/* No msi-available-ranges, so expect > 0 */
<------>WARN_ON(msi_bitmap_reserve_dt_hwirqs(&bmp) <= 0);
 
<------>/* Should all still be free */
<------>WARN_ON(bitmap_find_free_region(bmp.bitmap, SIZE_EXPECTED,
<------><------><------><------><------>get_count_order(SIZE_EXPECTED)));
<------>bitmap_release_region(bmp.bitmap, 0, get_count_order(SIZE_EXPECTED));
 
<------>/* Now create a fake msi-available-ranges property */
 
<------>/* There should really .. oh whatever */
<------>memset(&prop, 0, sizeof(prop));
<------>prop.name = prop_name;
<------>prop.value = &prop_data;
<------>prop.length = sizeof(prop_data);
 
<------>of_node.properties = &prop;
 
<------>/* msi-available-ranges, so expect == 0 */
<------>WARN_ON(msi_bitmap_reserve_dt_hwirqs(&bmp));
 
<------>/* Check we got the expected result */
<------>WARN_ON(bitmap_parselist(expected_str, expected, SIZE_EXPECTED));
<------>WARN_ON(!bitmap_equal(expected, bmp.bitmap, SIZE_EXPECTED));
 
<------>msi_bitmap_free(&bmp);
<------>kfree(bmp.bitmap);
}
 
static int __init msi_bitmap_selftest(void)
{
<------>printk(KERN_DEBUG "Running MSI bitmap self-tests ...\n");
 
<------>test_basics();
<------>test_of_node();
 
<------>return 0;
}
late_initcall(msi_bitmap_selftest);
#endif /* CONFIG_MSI_BITMAP_SELFTEST */