drivers/crypto/caam/compat.h


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/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright 2008-2011 Freescale Semiconductor, Inc.
 */

#ifndef CAAM_COMPAT_H
#define CAAM_COMPAT_H

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/crypto.h>
#include <linux/hash.h>
#include <linux/hw_random.h>
#include <linux/of_platform.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/iommu.h>
#include <linux/spinlock.h>
#include <linux/rtnetlink.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/debugfs.h>
#include <linux/circ_buf.h>
#include <linux/clk.h>
#include <net/xfrm.h>

#include <crypto/algapi.h>
#include <crypto/null.h>
#include <crypto/aes.h>
#include <crypto/ctr.h>
#include <crypto/internal/des.h>
#include <crypto/gcm.h>
#include <crypto/sha.h>
#include <crypto/md5.h>
#include <crypto/chacha.h>
#include <crypto/poly1305.h>
#include <crypto/internal/aead.h>
#include <crypto/authenc.h>
#include <crypto/akcipher.h>
#include <crypto/scatterwalk.h>
#include <crypto/skcipher.h>
#include <crypto/arc4.h>
#include <crypto/internal/skcipher.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/rsa.h>
#include <crypto/internal/akcipher.h>

#endif /* !defined(CAAM_COMPAT_H) */
/*
 * Xen time implementation.
 *
 * This is implemented in terms of a clocksource driver which uses
 * the hypervisor clock as a nanosecond timebase, and a clockevent
 * driver which uses the hypervisor's timer mechanism.
 *
 * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
 */
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/clocksource.h>
#include <linux/clockchips.h>
#include <linux/kernel_stat.h>
#include <linux/math64.h>

#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>

#include <xen/events.h>
#include <xen/interface/xen.h>
#include <xen/interface/vcpu.h>

#include "xen-ops.h"

#define XEN_SHIFT 22

/* Xen may fire a timer up to this many ns early */
#define TIMER_SLOP	100000
#define NS_PER_TICK	(1000000000LL / HZ)

static cycle_t xen_clocksource_read(void);

/* These are perodically updated in shared_info, and then copied here. */
struct shadow_time_info {
	u64 tsc_timestamp;     /* TSC at last update of time vals.  */
	u64 system_timestamp;  /* Time, in nanosecs, since boot.    */
	u32 tsc_to_nsec_mul;
	int tsc_shift;
	u32 version;
};

static DEFINE_PER_CPU(struct shadow_time_info, shadow_time);

/* runstate info updated by Xen */
static DEFINE_PER_CPU(struct vcpu_runstate_info, runstate);

/* snapshots of runstate info */
static DEFINE_PER_CPU(struct vcpu_runstate_info, runstate_snapshot);

/* unused ns of stolen and blocked time */
static DEFINE_PER_CPU(u64, residual_stolen);
static DEFINE_PER_CPU(u64, residual_blocked);

/* return an consistent snapshot of 64-bit time/counter value */
static u64 get64(const u64 *p)
{
	u64 ret;

	if (BITS_PER_LONG < 64) {
		u32 *p32 = (u32 *)p;
		u32 h, l;

		/*
		 * Read high then low, and then make sure high is
		 * still the same; this will only loop if low wraps
		 * and carries into high.
		 * XXX some clean way to make this endian-proof?
		 */
		do {
			h = p32[1];
			barrier();
			l = p32[0];
			barrier();
		} while (p32[1] != h);

		ret = (((u64)h) << 32) | l;
	} else
		ret = *p;

	return ret;
}

/*
 * Runstate accounting
 */
static void get_runstate_snapshot(struct vcpu_runstate_info *res)
{
	u64 state_time;
	struct vcpu_runstate_info *state;

	BUG_ON(preemptible());

	state = &__get_cpu_var(runstate);

	/*
	 * The runstate info is always updated by the hypervisor on
	 * the current CPU, so there's no need to use anything
	 * stronger than a compiler barrier when fetching it.
	 */
	do {
		state_time = get64(&state->state_entry_time);
		barrier();
		*res = *state;
		barrier();
	} while (get64(&state->state_entry_time) != state_time);
}

/* return true when a vcpu could run but has no real cpu to run on */
bool xen_vcpu_stolen(int vcpu)
{
	return per_cpu(runstate, vcpu).state == RUNSTATE_runnable;
}

static void setup_runstate_info(int cpu)
{
	struct vcpu_register_runstate_memory_area area;

	area.addr.v = &per_cpu(runstate, cpu);

	if (HYPERVISOR_vcpu_op(VCPUOP_register_runstate_memory_area,
			       cpu, &area))
		BUG();
}

static void do_stolen_accounting(void)
{
	struct vcpu_runstate_info state;
	struct vcpu_runstate_info *snap;
	s64 blocked, runnable, offline, stolen;
	cputime_t ticks;

	get_runstate_snapshot(&state);

	WARN_ON(state.state != RUNSTATE_running);

	snap = &__get_cpu_var(runstate_snapshot);

	/* work out how much time the VCPU has not been runn*ing*  */
	blocked = state.time[RUNSTATE_blocked] - snap->time[RUNSTATE_blocked];
	runnable = state.time[RUNSTATE_runnable] - snap->time[RUNSTATE_runnable];
	offline = state.time[RUNSTATE_offline] - snap->time[RUNSTATE_offline];

	*snap = state;

	/* Add the appropriate number of ticks of stolen time,
	   including any left-overs from last time.  Passing NULL to
	   account_steal_time accounts the time as stolen. */
	stolen = runnable + offline + __get_cpu_var(residual_stolen);

	if (stolen < 0)
		stolen = 0;

	ticks = iter_div_u64_rem(stolen, NS_PER_TICK, &stolen);
	__get_cpu_var(residual_stolen) = stolen;
	account_steal_time(NULL, ticks);

	/* Add the appropriate number of ticks of blocked time,
	   including any left-overs from last time.  Passing idle to
	   account_steal_time accounts the time as idle/wait. */
	blocked += __get_cpu_var(residual_blocked);

	if (blocked < 0)
		blocked = 0;

	ticks = iter_div_u64_rem(blocked, NS_PER_TICK, &blocked);
	__get_cpu_var(residual_blocked) = blocked;
	account_steal_time(idle_task(smp_processor_id()), ticks);
}

/*
 * Xen sched_clock implementation.  Returns the number of unstolen
 * nanoseconds, which is nanoseconds the VCPU spent in RUNNING+BLOCKED
 * states.
 */
unsigned long long xen_sched_clock(void)
{
	struct vcpu_runstate_info state;
	cycle_t now;
	u64 ret;
	s64 offset;

	/*
	 * Ideally sched_clock should be called on a per-cpu basis
	 * anyway, so preempt should already be disabled, but that's
	 * not current practice at the moment.
	 */
	preempt_disable();

	now = xen_clocksource_read();

	get_runstate_snapshot(&state);

	WARN_ON(state.state != RUNSTATE_running);

	offset = now - state.state_entry_time;
	if (offset < 0)
		offset = 0;

	ret = state.time[RUNSTATE_blocked] +
		state.time[RUNSTATE_running] +
		offset;

	preempt_enable();

	return ret;
}


/* Get the CPU speed from Xen */
unsigned long xen_cpu_khz(void)
{
	u64 xen_khz = 1000000ULL << 32;
	const struct vcpu_time_info *info =
		&HYPERVISOR_shared_info->vcpu_info[0].time;

	do_div(xen_khz, info->tsc_to_system_mul);
	if (info->tsc_shift < 0)
		xen_khz <<= -info->tsc_shift;
	else
		xen_khz >>= info->tsc_shift;

	return xen_khz;
}

/*
 * Reads a consistent set of time-base values from Xen, into a shadow data
 * area.
 */
static unsigned get_time_values_from_xen(void)
{
	struct vcpu_time_info   *src;
	struct shadow_time_info *dst;

	/* src is shared memory with the hypervisor, so we need to
	   make sure we get a consistent snapshot, even in the face of
	   being preempted. */
	src = &__get_cpu_var(xen_vcpu)->time;
	dst = &__get_cpu_var(shadow_time);

	do {
		dst->version = src->version;
		rmb();		/* fetch version before data */
		dst->tsc_timestamp     = src->tsc_timestamp;
		dst->system_timestamp  = src->system_time;
		dst->tsc_to_nsec_mul   = src->tsc_to_system_mul;
		dst->tsc_shift         = src->tsc_shift;
		rmb();		/* test version after fetching data */
	} while ((src->version & 1) | (dst->version ^ src->version));

	return dst->version;
}

/*
 * Scale a 64-bit delta by scaling and multiplying by a 32-bit fraction,
 * yielding a 64-bit result.
 */
static inline u64 scale_delta(u64 delta, u32 mul_frac, int shift)
{
	u64 product;
#ifdef __i386__
	u32 tmp1, tmp2;
#endif

	if (shift < 0)
		delta >>= -shift;
	else
		delta <<= shift;

#ifdef __i386__
	__asm__ (
		"mul  %5       ; "
		"mov  %4,%%eax ; "
		"mov  %%edx,%4 ; "
		"mul  %5       ; "
		"xor  %5,%5    ; "
		"add  %4,%%eax ; "
		"adc  %5,%%edx ; "
		: "=A" (product), "=r" (tmp1), "=r" (tmp2)
		: "a" ((u32)delta), "1" ((u32)(delta >> 32)), "2" (mul_frac) );
#elif _