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linux_dsm_epyc7002/arch/powerpc/platforms/powermac/sleep.S
Linus Torvalds 192f0f8e9d powerpc updates for 5.3 
Notable changes:
 
  - Removal of the NPU DMA code, used by the out-of-tree Nvidia driver, as well
    as some other functions only used by drivers that haven't (yet?) made it
    upstream.
 
  - A fix for a bug in our handling of hardware watchpoints (eg. perf record -e
    mem: ...) which could lead to register corruption and kernel crashes.
 
  - Enable HAVE_ARCH_HUGE_VMAP, which allows us to use large pages for vmalloc
    when using the Radix MMU.
 
  - A large but incremental rewrite of our exception handling code to use gas
    macros rather than multiple levels of nested CPP macros.
 
 And the usual small fixes, cleanups and improvements.
 
 Thanks to:
   Alastair D'Silva, Alexey Kardashevskiy, Andreas Schwab, Aneesh Kumar K.V, Anju
   T Sudhakar, Anton Blanchard, Arnd Bergmann, Athira Rajeev, Cédric Le Goater,
   Christian Lamparter, Christophe Leroy, Christophe Lombard, Christoph Hellwig,
   Daniel Axtens, Denis Efremov, Enrico Weigelt, Frederic Barrat, Gautham R.
   Shenoy, Geert Uytterhoeven, Geliang Tang, Gen Zhang, Greg Kroah-Hartman, Greg
   Kurz, Gustavo Romero, Krzysztof Kozlowski, Madhavan Srinivasan, Masahiro
   Yamada, Mathieu Malaterre, Michael Neuling, Nathan Lynch, Naveen N. Rao,
   Nicholas Piggin, Nishad Kamdar, Oliver O'Halloran, Qian Cai, Ravi Bangoria,
   Sachin Sant, Sam Bobroff, Satheesh Rajendran, Segher Boessenkool, Shaokun
   Zhang, Shawn Anastasio, Stewart Smith, Suraj Jitindar Singh, Thiago Jung
   Bauermann, YueHaibing.
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Merge tag 'powerpc-5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc updates from Michael Ellerman:
 "Notable changes:

   - Removal of the NPU DMA code, used by the out-of-tree Nvidia driver,
     as well as some other functions only used by drivers that haven't
     (yet?) made it upstream.

   - A fix for a bug in our handling of hardware watchpoints (eg. perf
     record -e mem: ...) which could lead to register corruption and
     kernel crashes.

   - Enable HAVE_ARCH_HUGE_VMAP, which allows us to use large pages for
     vmalloc when using the Radix MMU.

   - A large but incremental rewrite of our exception handling code to
     use gas macros rather than multiple levels of nested CPP macros.

  And the usual small fixes, cleanups and improvements.

  Thanks to: Alastair D'Silva, Alexey Kardashevskiy, Andreas Schwab,
  Aneesh Kumar K.V, Anju T Sudhakar, Anton Blanchard, Arnd Bergmann,
  Athira Rajeev, Cédric Le Goater, Christian Lamparter, Christophe
  Leroy, Christophe Lombard, Christoph Hellwig, Daniel Axtens, Denis
  Efremov, Enrico Weigelt, Frederic Barrat, Gautham R. Shenoy, Geert
  Uytterhoeven, Geliang Tang, Gen Zhang, Greg Kroah-Hartman, Greg Kurz,
  Gustavo Romero, Krzysztof Kozlowski, Madhavan Srinivasan, Masahiro
  Yamada, Mathieu Malaterre, Michael Neuling, Nathan Lynch, Naveen N.
  Rao, Nicholas Piggin, Nishad Kamdar, Oliver O'Halloran, Qian Cai, Ravi
  Bangoria, Sachin Sant, Sam Bobroff, Satheesh Rajendran, Segher
  Boessenkool, Shaokun Zhang, Shawn Anastasio, Stewart Smith, Suraj
  Jitindar Singh, Thiago Jung Bauermann, YueHaibing"

* tag 'powerpc-5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (163 commits)
  powerpc/powernv/idle: Fix restore of SPRN_LDBAR for POWER9 stop state.
  powerpc/eeh: Handle hugepages in ioremap space
  ocxl: Update for AFU descriptor template version 1.1
  powerpc/boot: pass CONFIG options in a simpler and more robust way
  powerpc/boot: add {get, put}_unaligned_be32 to xz_config.h
  powerpc/irq: Don't WARN continuously in arch_local_irq_restore()
  powerpc/module64: Use symbolic instructions names.
  powerpc/module32: Use symbolic instructions names.
  powerpc: Move PPC_HA() PPC_HI() and PPC_LO() to ppc-opcode.h
  powerpc/module64: Fix comment in R_PPC64_ENTRY handling
  powerpc/boot: Add lzo support for uImage
  powerpc/boot: Add lzma support for uImage
  powerpc/boot: don't force gzipped uImage
  powerpc/8xx: Add microcode patch to move SMC parameter RAM.
  powerpc/8xx: Use IO accessors in microcode programming.
  powerpc/8xx: replace #ifdefs by IS_ENABLED() in microcode.c
  powerpc/8xx: refactor programming of microcode CPM params.
  powerpc/8xx: refactor printing of microcode patch name.
  powerpc/8xx: Refactor microcode write
  powerpc/8xx: refactor writing of CPM microcode arrays
  ...
2019-07-13 16:08:36 -07:00

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* This file contains sleep low-level functions for PowerBook G3.
* Copyright (C) 1999 Benjamin Herrenschmidt (benh@kernel.crashing.org)
* and Paul Mackerras (paulus@samba.org).
*/
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/ppc_asm.h>
#include <asm/cputable.h>
#include <asm/cache.h>
#include <asm/thread_info.h>
#include <asm/asm-offsets.h>
#include <asm/mmu.h>
#include <asm/feature-fixups.h>
#define MAGIC 0x4c617273 /* 'Lars' */
/*
* Structure for storing CPU registers on the stack.
*/
#define SL_SP 0
#define SL_PC 4
#define SL_MSR 8
#define SL_SDR1 0xc
#define SL_SPRG0 0x10 /* 4 sprg's */
#define SL_DBAT0 0x20
#define SL_IBAT0 0x28
#define SL_DBAT1 0x30
#define SL_IBAT1 0x38
#define SL_DBAT2 0x40
#define SL_IBAT2 0x48
#define SL_DBAT3 0x50
#define SL_IBAT3 0x58
#define SL_DBAT4 0x60
#define SL_IBAT4 0x68
#define SL_DBAT5 0x70
#define SL_IBAT5 0x78
#define SL_DBAT6 0x80
#define SL_IBAT6 0x88
#define SL_DBAT7 0x90
#define SL_IBAT7 0x98
#define SL_TB 0xa0
#define SL_R2 0xa8
#define SL_CR 0xac
#define SL_R12 0xb0 /* r12 to r31 */
#define SL_SIZE (SL_R12 + 80)
.section .text
.align 5
#if defined(CONFIG_PM) || defined(CONFIG_CPU_FREQ_PMAC) || \
(defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC32))
/* This gets called by via-pmu.c late during the sleep process.
* The PMU was already send the sleep command and will shut us down
* soon. We need to save all that is needed and setup the wakeup
* vector that will be called by the ROM on wakeup
*/
_GLOBAL(low_sleep_handler)
#ifndef CONFIG_PPC_BOOK3S_32
blr
#else
mflr r0
stw r0,4(r1)
stwu r1,-SL_SIZE(r1)
mfcr r0
stw r0,SL_CR(r1)
stw r2,SL_R2(r1)
stmw r12,SL_R12(r1)
/* Save MSR & SDR1 */
mfmsr r4
stw r4,SL_MSR(r1)
mfsdr1 r4
stw r4,SL_SDR1(r1)
/* Get a stable timebase and save it */
1: mftbu r4
stw r4,SL_TB(r1)
mftb r5
stw r5,SL_TB+4(r1)
mftbu r3
cmpw r3,r4
bne 1b
/* Save SPRGs */
mfsprg r4,0
stw r4,SL_SPRG0(r1)
mfsprg r4,1
stw r4,SL_SPRG0+4(r1)
mfsprg r4,2
stw r4,SL_SPRG0+8(r1)
mfsprg r4,3
stw r4,SL_SPRG0+12(r1)
/* Save BATs */
mfdbatu r4,0
stw r4,SL_DBAT0(r1)
mfdbatl r4,0
stw r4,SL_DBAT0+4(r1)
mfdbatu r4,1
stw r4,SL_DBAT1(r1)
mfdbatl r4,1
stw r4,SL_DBAT1+4(r1)
mfdbatu r4,2
stw r4,SL_DBAT2(r1)
mfdbatl r4,2
stw r4,SL_DBAT2+4(r1)
mfdbatu r4,3
stw r4,SL_DBAT3(r1)
mfdbatl r4,3
stw r4,SL_DBAT3+4(r1)
mfibatu r4,0
stw r4,SL_IBAT0(r1)
mfibatl r4,0
stw r4,SL_IBAT0+4(r1)
mfibatu r4,1
stw r4,SL_IBAT1(r1)
mfibatl r4,1
stw r4,SL_IBAT1+4(r1)
mfibatu r4,2
stw r4,SL_IBAT2(r1)
mfibatl r4,2
stw r4,SL_IBAT2+4(r1)
mfibatu r4,3
stw r4,SL_IBAT3(r1)
mfibatl r4,3
stw r4,SL_IBAT3+4(r1)
BEGIN_MMU_FTR_SECTION
mfspr r4,SPRN_DBAT4U
stw r4,SL_DBAT4(r1)
mfspr r4,SPRN_DBAT4L
stw r4,SL_DBAT4+4(r1)
mfspr r4,SPRN_DBAT5U
stw r4,SL_DBAT5(r1)
mfspr r4,SPRN_DBAT5L
stw r4,SL_DBAT5+4(r1)
mfspr r4,SPRN_DBAT6U
stw r4,SL_DBAT6(r1)
mfspr r4,SPRN_DBAT6L
stw r4,SL_DBAT6+4(r1)
mfspr r4,SPRN_DBAT7U
stw r4,SL_DBAT7(r1)
mfspr r4,SPRN_DBAT7L
stw r4,SL_DBAT7+4(r1)
mfspr r4,SPRN_IBAT4U
stw r4,SL_IBAT4(r1)
mfspr r4,SPRN_IBAT4L
stw r4,SL_IBAT4+4(r1)
mfspr r4,SPRN_IBAT5U
stw r4,SL_IBAT5(r1)
mfspr r4,SPRN_IBAT5L
stw r4,SL_IBAT5+4(r1)
mfspr r4,SPRN_IBAT6U
stw r4,SL_IBAT6(r1)
mfspr r4,SPRN_IBAT6L
stw r4,SL_IBAT6+4(r1)
mfspr r4,SPRN_IBAT7U
stw r4,SL_IBAT7(r1)
mfspr r4,SPRN_IBAT7L
stw r4,SL_IBAT7+4(r1)
END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS)
/* Backup various CPU config stuffs */
bl __save_cpu_setup
/* The ROM can wake us up via 2 different vectors:
* - On wallstreet & lombard, we must write a magic
* value 'Lars' at address 4 and a pointer to a
* memory location containing the PC to resume from
* at address 0.
* - On Core99, we must store the wakeup vector at
* address 0x80 and eventually it's parameters
* at address 0x84. I've have some trouble with those
* parameters however and I no longer use them.
*/
lis r5,grackle_wake_up@ha
addi r5,r5,grackle_wake_up@l
tophys(r5,r5)
stw r5,SL_PC(r1)
lis r4,KERNELBASE@h
tophys(r5,r1)
addi r5,r5,SL_PC
lis r6,MAGIC@ha
addi r6,r6,MAGIC@l
stw r5,0(r4)
stw r6,4(r4)
/* Setup stuffs at 0x80-0x84 for Core99 */
lis r3,core99_wake_up@ha
addi r3,r3,core99_wake_up@l
tophys(r3,r3)
stw r3,0x80(r4)
stw r5,0x84(r4)
/* Store a pointer to our backup storage into
* a kernel global
*/
lis r3,sleep_storage@ha
addi r3,r3,sleep_storage@l
stw r5,0(r3)
.globl low_cpu_die
low_cpu_die:
/* Flush & disable all caches */
bl flush_disable_caches
/* Turn off data relocation. */
mfmsr r3 /* Save MSR in r7 */
rlwinm r3,r3,0,28,26 /* Turn off DR bit */
sync
mtmsr r3
isync
BEGIN_FTR_SECTION
/* Flush any pending L2 data prefetches to work around HW bug */
sync
lis r3,0xfff0
lwz r0,0(r3) /* perform cache-inhibited load to ROM */
sync /* (caches are disabled at this point) */
END_FTR_SECTION_IFSET(CPU_FTR_SPEC7450)
/*
* Set the HID0 and MSR for sleep.
*/
mfspr r2,SPRN_HID0
rlwinm r2,r2,0,10,7 /* clear doze, nap */
oris r2,r2,HID0_SLEEP@h
sync
isync
mtspr SPRN_HID0,r2
sync
/* This loop puts us back to sleep in case we have a spurrious
* wakeup so that the host bridge properly stays asleep. The
* CPU will be turned off, either after a known time (about 1
* second) on wallstreet & lombard, or as soon as the CPU enters
* SLEEP mode on core99
*/
mfmsr r2
oris r2,r2,MSR_POW@h
1: sync
mtmsr r2
isync
b 1b
/*
* Here is the resume code.
*/
/*
* Core99 machines resume here
* r4 has the physical address of SL_PC(sp) (unused)
*/
_GLOBAL(core99_wake_up)
/* Make sure HID0 no longer contains any sleep bit and that data cache
* is disabled
*/
mfspr r3,SPRN_HID0
rlwinm r3,r3,0,11,7 /* clear SLEEP, NAP, DOZE bits */
rlwinm 3,r3,0,18,15 /* clear DCE, ICE */
mtspr SPRN_HID0,r3
sync
isync
/* sanitize MSR */
mfmsr r3
ori r3,r3,MSR_EE|MSR_IP
xori r3,r3,MSR_EE|MSR_IP
sync
isync
mtmsr r3
sync
isync
/* Recover sleep storage */
lis r3,sleep_storage@ha
addi r3,r3,sleep_storage@l
tophys(r3,r3)
lwz r1,0(r3)
/* Pass thru to older resume code ... */
/*
* Here is the resume code for older machines.
* r1 has the physical address of SL_PC(sp).
*/
grackle_wake_up:
/* Restore the kernel's segment registers before
* we do any r1 memory access as we are not sure they
* are in a sane state above the first 256Mb region
*/
li r0,16 /* load up segment register values */
mtctr r0 /* for context 0 */
lis r3,0x2000 /* Ku = 1, VSID = 0 */
li r4,0
3: mtsrin r3,r4
addi r3,r3,0x111 /* increment VSID */
addis r4,r4,0x1000 /* address of next segment */
bdnz 3b
sync
isync
subi r1,r1,SL_PC
/* Restore various CPU config stuffs */
bl __restore_cpu_setup
/* Make sure all FPRs have been initialized */
bl reloc_offset
bl __init_fpu_registers
/* Invalidate & enable L1 cache, we don't care about
* whatever the ROM may have tried to write to memory
*/
bl __inval_enable_L1
/* Restore the BATs, and SDR1. Then we can turn on the MMU. */
lwz r4,SL_SDR1(r1)
mtsdr1 r4
lwz r4,SL_SPRG0(r1)
mtsprg 0,r4
lwz r4,SL_SPRG0+4(r1)
mtsprg 1,r4
lwz r4,SL_SPRG0+8(r1)
mtsprg 2,r4
lwz r4,SL_SPRG0+12(r1)
mtsprg 3,r4
lwz r4,SL_DBAT0(r1)
mtdbatu 0,r4
lwz r4,SL_DBAT0+4(r1)
mtdbatl 0,r4
lwz r4,SL_DBAT1(r1)
mtdbatu 1,r4
lwz r4,SL_DBAT1+4(r1)
mtdbatl 1,r4
lwz r4,SL_DBAT2(r1)
mtdbatu 2,r4
lwz r4,SL_DBAT2+4(r1)
mtdbatl 2,r4
lwz r4,SL_DBAT3(r1)
mtdbatu 3,r4
lwz r4,SL_DBAT3+4(r1)
mtdbatl 3,r4
lwz r4,SL_IBAT0(r1)
mtibatu 0,r4
lwz r4,SL_IBAT0+4(r1)
mtibatl 0,r4
lwz r4,SL_IBAT1(r1)
mtibatu 1,r4
lwz r4,SL_IBAT1+4(r1)
mtibatl 1,r4
lwz r4,SL_IBAT2(r1)
mtibatu 2,r4
lwz r4,SL_IBAT2+4(r1)
mtibatl 2,r4
lwz r4,SL_IBAT3(r1)
mtibatu 3,r4
lwz r4,SL_IBAT3+4(r1)
mtibatl 3,r4
BEGIN_MMU_FTR_SECTION
lwz r4,SL_DBAT4(r1)
mtspr SPRN_DBAT4U,r4
lwz r4,SL_DBAT4+4(r1)
mtspr SPRN_DBAT4L,r4
lwz r4,SL_DBAT5(r1)
mtspr SPRN_DBAT5U,r4
lwz r4,SL_DBAT5+4(r1)
mtspr SPRN_DBAT5L,r4
lwz r4,SL_DBAT6(r1)
mtspr SPRN_DBAT6U,r4
lwz r4,SL_DBAT6+4(r1)
mtspr SPRN_DBAT6L,r4
lwz r4,SL_DBAT7(r1)
mtspr SPRN_DBAT7U,r4
lwz r4,SL_DBAT7+4(r1)
mtspr SPRN_DBAT7L,r4
lwz r4,SL_IBAT4(r1)
mtspr SPRN_IBAT4U,r4
lwz r4,SL_IBAT4+4(r1)
mtspr SPRN_IBAT4L,r4
lwz r4,SL_IBAT5(r1)
mtspr SPRN_IBAT5U,r4
lwz r4,SL_IBAT5+4(r1)
mtspr SPRN_IBAT5L,r4
lwz r4,SL_IBAT6(r1)
mtspr SPRN_IBAT6U,r4
lwz r4,SL_IBAT6+4(r1)
mtspr SPRN_IBAT6L,r4
lwz r4,SL_IBAT7(r1)
mtspr SPRN_IBAT7U,r4
lwz r4,SL_IBAT7+4(r1)
mtspr SPRN_IBAT7L,r4
END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS)
/* Flush all TLBs */
lis r4,0x1000
1: addic. r4,r4,-0x1000
tlbie r4
blt 1b
sync
/* restore the MSR and turn on the MMU */
lwz r3,SL_MSR(r1)
bl turn_on_mmu
/* get back the stack pointer */
tovirt(r1,r1)
/* Restore TB */
li r3,0
mttbl r3
lwz r3,SL_TB(r1)
lwz r4,SL_TB+4(r1)
mttbu r3
mttbl r4
/* Restore the callee-saved registers and return */
lwz r0,SL_CR(r1)
mtcr r0
lwz r2,SL_R2(r1)
lmw r12,SL_R12(r1)
addi r1,r1,SL_SIZE
lwz r0,4(r1)
mtlr r0
blr
turn_on_mmu:
mflr r4
tovirt(r4,r4)
mtsrr0 r4
mtsrr1 r3
sync
isync
rfi
#endif /* defined(CONFIG_PM) || defined(CONFIG_CPU_FREQ) */
.section .data
.balign L1_CACHE_BYTES
sleep_storage:
.long 0
.balign L1_CACHE_BYTES, 0
#endif /* CONFIG_PPC_BOOK3S_32 */
.section .text
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