^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright 2006-2008, Michael Ellerman, IBM Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/kmemleak.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/bitmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <asm/msi_bitmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) int msi_bitmap_alloc_hwirqs(struct msi_bitmap *bmp, int num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) int offset, order = get_count_order(num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) spin_lock_irqsave(&bmp->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) offset = bitmap_find_next_zero_area(bmp->bitmap, bmp->irq_count, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) num, (1 << order) - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) if (offset > bmp->irq_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) bitmap_set(bmp->bitmap, offset, num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) spin_unlock_irqrestore(&bmp->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) pr_debug("msi_bitmap: allocated 0x%x at offset 0x%x\n", num, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) return offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) spin_unlock_irqrestore(&bmp->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) EXPORT_SYMBOL(msi_bitmap_alloc_hwirqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) void msi_bitmap_free_hwirqs(struct msi_bitmap *bmp, unsigned int offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) unsigned int num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) pr_debug("msi_bitmap: freeing 0x%x at offset 0x%x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) num, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) spin_lock_irqsave(&bmp->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) bitmap_clear(bmp->bitmap, offset, num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) spin_unlock_irqrestore(&bmp->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) EXPORT_SYMBOL(msi_bitmap_free_hwirqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) void msi_bitmap_reserve_hwirq(struct msi_bitmap *bmp, unsigned int hwirq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) pr_debug("msi_bitmap: reserving hwirq 0x%x\n", hwirq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) spin_lock_irqsave(&bmp->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) bitmap_allocate_region(bmp->bitmap, hwirq, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) spin_unlock_irqrestore(&bmp->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * msi_bitmap_reserve_dt_hwirqs - Reserve irqs specified in the device tree.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * @bmp: pointer to the MSI bitmap.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * Looks in the device tree to see if there is a property specifying which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * irqs can be used for MSI. If found those irqs reserved in the device tree
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * are reserved in the bitmap.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * Returns 0 for success, < 0 if there was an error, and > 0 if no property
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * was found in the device tree.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) int msi_bitmap_reserve_dt_hwirqs(struct msi_bitmap *bmp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) int i, j, len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) const u32 *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) if (!bmp->of_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) p = of_get_property(bmp->of_node, "msi-available-ranges", &len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) if (!p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) pr_debug("msi_bitmap: no msi-available-ranges property " \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) "found on %pOF\n", bmp->of_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) if (len % (2 * sizeof(u32)) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) printk(KERN_WARNING "msi_bitmap: Malformed msi-available-ranges"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) " property on %pOF\n", bmp->of_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) bitmap_allocate_region(bmp->bitmap, 0, get_count_order(bmp->irq_count));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) spin_lock(&bmp->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) /* Format is: (<u32 start> <u32 count>)+ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) len /= 2 * sizeof(u32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) for (i = 0; i < len; i++, p += 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) for (j = 0; j < *(p + 1); j++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) bitmap_release_region(bmp->bitmap, *p + j, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) spin_unlock(&bmp->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) int __ref msi_bitmap_alloc(struct msi_bitmap *bmp, unsigned int irq_count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct device_node *of_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) int size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (!irq_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) size = BITS_TO_LONGS(irq_count) * sizeof(long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) pr_debug("msi_bitmap: allocator bitmap size is 0x%x bytes\n", size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) bmp->bitmap_from_slab = slab_is_available();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (bmp->bitmap_from_slab)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) bmp->bitmap = kzalloc(size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) bmp->bitmap = memblock_alloc(size, SMP_CACHE_BYTES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) if (!bmp->bitmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) panic("%s: Failed to allocate %u bytes\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) /* the bitmap won't be freed from memblock allocator */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) kmemleak_not_leak(bmp->bitmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) if (!bmp->bitmap) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) pr_debug("msi_bitmap: ENOMEM allocating allocator bitmap!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) /* We zalloc'ed the bitmap, so all irqs are free by default */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) spin_lock_init(&bmp->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) bmp->of_node = of_node_get(of_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) bmp->irq_count = irq_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) void msi_bitmap_free(struct msi_bitmap *bmp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (bmp->bitmap_from_slab)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) kfree(bmp->bitmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) of_node_put(bmp->of_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) bmp->bitmap = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) #ifdef CONFIG_MSI_BITMAP_SELFTEST
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static void __init test_basics(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) struct msi_bitmap bmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) int rc, i, size = 512;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) /* Can't allocate a bitmap of 0 irqs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) WARN_ON(msi_bitmap_alloc(&bmp, 0, NULL) == 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) /* of_node may be NULL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) WARN_ON(msi_bitmap_alloc(&bmp, size, NULL));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) /* Should all be free by default */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) WARN_ON(bitmap_find_free_region(bmp.bitmap, size, get_count_order(size)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) bitmap_release_region(bmp.bitmap, 0, get_count_order(size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) /* With no node, there's no msi-available-ranges, so expect > 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) WARN_ON(msi_bitmap_reserve_dt_hwirqs(&bmp) <= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) /* Should all still be free */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) WARN_ON(bitmap_find_free_region(bmp.bitmap, size, get_count_order(size)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) bitmap_release_region(bmp.bitmap, 0, get_count_order(size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) /* Check we can fill it up and then no more */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) for (i = 0; i < size; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) WARN_ON(msi_bitmap_alloc_hwirqs(&bmp, 1) < 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) WARN_ON(msi_bitmap_alloc_hwirqs(&bmp, 1) >= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) /* Should all be allocated */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) WARN_ON(bitmap_find_free_region(bmp.bitmap, size, 0) >= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) /* And if we free one we can then allocate another */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) msi_bitmap_free_hwirqs(&bmp, size / 2, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) WARN_ON(msi_bitmap_alloc_hwirqs(&bmp, 1) != size / 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) /* Free most of them for the alignment tests */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) msi_bitmap_free_hwirqs(&bmp, 3, size - 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) /* Check we get a naturally aligned offset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) rc = msi_bitmap_alloc_hwirqs(&bmp, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) WARN_ON(rc < 0 && rc % 2 != 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) rc = msi_bitmap_alloc_hwirqs(&bmp, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) WARN_ON(rc < 0 && rc % 4 != 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) rc = msi_bitmap_alloc_hwirqs(&bmp, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) WARN_ON(rc < 0 && rc % 8 != 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) rc = msi_bitmap_alloc_hwirqs(&bmp, 9);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) WARN_ON(rc < 0 && rc % 16 != 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) rc = msi_bitmap_alloc_hwirqs(&bmp, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) WARN_ON(rc < 0 && rc % 4 != 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) rc = msi_bitmap_alloc_hwirqs(&bmp, 7);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) WARN_ON(rc < 0 && rc % 8 != 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) rc = msi_bitmap_alloc_hwirqs(&bmp, 121);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) WARN_ON(rc < 0 && rc % 128 != 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) msi_bitmap_free(&bmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) /* Clients may WARN_ON bitmap == NULL for "not-allocated" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) WARN_ON(bmp.bitmap != NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) static void __init test_of_node(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) u32 prop_data[] = { 10, 10, 25, 3, 40, 1, 100, 100, 200, 20 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) const char *expected_str = "0-9,20-24,28-39,41-99,220-255";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) char *prop_name = "msi-available-ranges";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) char *node_name = "/fakenode";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) struct device_node of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) struct property prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) struct msi_bitmap bmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) #define SIZE_EXPECTED 256
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) DECLARE_BITMAP(expected, SIZE_EXPECTED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) /* There should really be a struct device_node allocator */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) memset(&of_node, 0, sizeof(of_node));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) of_node_init(&of_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) of_node.full_name = node_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) WARN_ON(msi_bitmap_alloc(&bmp, SIZE_EXPECTED, &of_node));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) /* No msi-available-ranges, so expect > 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) WARN_ON(msi_bitmap_reserve_dt_hwirqs(&bmp) <= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) /* Should all still be free */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) WARN_ON(bitmap_find_free_region(bmp.bitmap, SIZE_EXPECTED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) get_count_order(SIZE_EXPECTED)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) bitmap_release_region(bmp.bitmap, 0, get_count_order(SIZE_EXPECTED));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) /* Now create a fake msi-available-ranges property */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) /* There should really .. oh whatever */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) memset(&prop, 0, sizeof(prop));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) prop.name = prop_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) prop.value = &prop_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) prop.length = sizeof(prop_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) of_node.properties = ∝
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) /* msi-available-ranges, so expect == 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) WARN_ON(msi_bitmap_reserve_dt_hwirqs(&bmp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) /* Check we got the expected result */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) WARN_ON(bitmap_parselist(expected_str, expected, SIZE_EXPECTED));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) WARN_ON(!bitmap_equal(expected, bmp.bitmap, SIZE_EXPECTED));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) msi_bitmap_free(&bmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) kfree(bmp.bitmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) static int __init msi_bitmap_selftest(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) printk(KERN_DEBUG "Running MSI bitmap self-tests ...\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) test_basics();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) test_of_node();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) late_initcall(msi_bitmap_selftest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) #endif /* CONFIG_MSI_BITMAP_SELFTEST */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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