https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: a5e13c6df0e41702d2b2c77c8ad41677ebb065b3 authored by Linus Torvalds on 28 March 2021, 22:48:16 UTC
Linux 5.12-rc5
Linux 5.12-rc5
Tip revision: a5e13c6
epapr_paravirt.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* ePAPR para-virtualization support.
*
* Copyright (C) 2012 Freescale Semiconductor, Inc.
*/
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <asm/epapr_hcalls.h>
#include <asm/cacheflush.h>
#include <asm/code-patching.h>
#include <asm/machdep.h>
#include <asm/inst.h>
#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
extern void epapr_ev_idle(void);
extern u32 epapr_ev_idle_start[];
#endif
bool epapr_paravirt_enabled;
static bool __maybe_unused epapr_has_idle;
static int __init early_init_dt_scan_epapr(unsigned long node,
const char *uname,
int depth, void *data)
{
const u32 *insts;
int len;
int i;
insts = of_get_flat_dt_prop(node, "hcall-instructions", &len);
if (!insts)
return 0;
if (len % 4 || len > (4 * 4))
return -1;
for (i = 0; i < (len / 4); i++) {
struct ppc_inst inst = ppc_inst(be32_to_cpu(insts[i]));
patch_instruction((struct ppc_inst *)(epapr_hypercall_start + i), inst);
#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
patch_instruction((struct ppc_inst *)(epapr_ev_idle_start + i), inst);
#endif
}
#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
if (of_get_flat_dt_prop(node, "has-idle", NULL))
epapr_has_idle = true;
#endif
epapr_paravirt_enabled = true;
return 1;
}
int __init epapr_paravirt_early_init(void)
{
of_scan_flat_dt(early_init_dt_scan_epapr, NULL);
return 0;
}
static int __init epapr_idle_init(void)
{
#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
if (epapr_has_idle)
ppc_md.power_save = epapr_ev_idle;
#endif
return 0;
}
postcore_initcall(epapr_idle_init);