// 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 <linux/of.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_or_panic(size, SMP_CACHE_BYTES);
                /* 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 */