cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mpic_msi.c (2352B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright 2006-2007, Michael Ellerman, IBM Corporation.
      4 */
      5
      6#include <linux/irq.h>
      7#include <linux/irqdomain.h>
      8#include <linux/of_irq.h>
      9#include <linux/bitmap.h>
     10#include <linux/msi.h>
     11#include <asm/mpic.h>
     12#include <asm/hw_irq.h>
     13#include <asm/ppc-pci.h>
     14#include <asm/msi_bitmap.h>
     15
     16#include <sysdev/mpic.h>
     17
     18void mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq)
     19{
     20	/* The mpic calls this even when there is no allocator setup */
     21	if (!mpic->msi_bitmap.bitmap)
     22		return;
     23
     24	msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq);
     25}
     26
     27#ifdef CONFIG_MPIC_U3_HT_IRQS
     28static int __init mpic_msi_reserve_u3_hwirqs(struct mpic *mpic)
     29{
     30	irq_hw_number_t hwirq;
     31	const struct irq_domain_ops *ops = mpic->irqhost->ops;
     32	struct device_node *np;
     33	int flags, index, i;
     34	struct of_phandle_args oirq;
     35
     36	pr_debug("mpic: found U3, guessing msi allocator setup\n");
     37
     38	/* Reserve source numbers we know are reserved in the HW.
     39	 *
     40	 * This is a bit of a mix of U3 and U4 reserves but that's going
     41	 * to work fine, we have plenty enough numbers left so let's just
     42	 * mark anything we don't like reserved.
     43	 */
     44	for (i = 0;   i < 8;   i++)
     45		msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
     46
     47	for (i = 42;  i < 46;  i++)
     48		msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
     49
     50	for (i = 100; i < 105; i++)
     51		msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
     52
     53	for (i = 124; i < mpic->num_sources; i++)
     54		msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
     55
     56
     57	np = NULL;
     58	while ((np = of_find_all_nodes(np))) {
     59		pr_debug("mpic: mapping hwirqs for %pOF\n", np);
     60
     61		index = 0;
     62		while (of_irq_parse_one(np, index++, &oirq) == 0) {
     63			ops->xlate(mpic->irqhost, NULL, oirq.args,
     64						oirq.args_count, &hwirq, &flags);
     65			msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq);
     66		}
     67	}
     68
     69	return 0;
     70}
     71#else
     72static int __init mpic_msi_reserve_u3_hwirqs(struct mpic *mpic)
     73{
     74	return -1;
     75}
     76#endif
     77
     78int __init mpic_msi_init_allocator(struct mpic *mpic)
     79{
     80	int rc;
     81
     82	rc = msi_bitmap_alloc(&mpic->msi_bitmap, mpic->num_sources,
     83			      irq_domain_get_of_node(mpic->irqhost));
     84	if (rc)
     85		return rc;
     86
     87	rc = msi_bitmap_reserve_dt_hwirqs(&mpic->msi_bitmap);
     88	if (rc > 0) {
     89		if (mpic->flags & MPIC_U3_HT_IRQS)
     90			rc = mpic_msi_reserve_u3_hwirqs(mpic);
     91
     92		if (rc) {
     93			msi_bitmap_free(&mpic->msi_bitmap);
     94			return rc;
     95		}
     96	}
     97
     98	return 0;
     99}