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linux_dsm_epyc7002/arch/mips/include/asm/mips-cm.h
Matt Redfearn 7745199723 MIPS: pm-cps: Support CM3 changes to Coherence Enable Register 
MIPS CM3 changed the management of coherence. Instead of a coherence
control register with a bitmask of coherent domains, CM3 simply has a
coherence enable register with a single bit to enable coherence of the
local core. Support this by clearing and setting this single bit to
disable / enable coherence.

Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Reviewed-by: Paul Burton <paul.burton@imgtec.com>
Cc: Adam Buchbinder <adam.buchbinder@gmail.com>
Cc: Tony Wu <tung7970@gmail.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Nikolay Martynov <mar.kolya@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14226/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2016-10-04 16:13:57 +02:00

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/*
* Copyright (C) 2013 Imagination Technologies
* Author: Paul Burton <paul.burton@imgtec.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#ifndef __MIPS_ASM_MIPS_CM_H__
#define __MIPS_ASM_MIPS_CM_H__
#include <linux/bitops.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/types.h>
/* The base address of the CM GCR block */
extern void __iomem *mips_cm_base;
/* The base address of the CM L2-only sync region */
extern void __iomem *mips_cm_l2sync_base;
/**
* __mips_cm_phys_base - retrieve the physical base address of the CM
*
* This function returns the physical base address of the Coherence Manager
* global control block, or 0 if no Coherence Manager is present. It provides
* a default implementation which reads the CMGCRBase register where available,
* and may be overridden by platforms which determine this address in a
* different way by defining a function with the same prototype except for the
* name mips_cm_phys_base (without underscores).
*/
extern phys_addr_t __mips_cm_phys_base(void);
/*
* mips_cm_is64 - determine CM register width
*
* The CM register width is determined by the version of the CM, with CM3
* introducing 64 bit GCRs and all prior CM versions having 32 bit GCRs.
* However we may run a kernel built for MIPS32 on a system with 64 bit GCRs,
* or vice-versa. This variable indicates the width of the memory accesses
* that the kernel will perform to GCRs, which may differ from the actual
* width of the GCRs.
*
* It's set to 0 for 32-bit accesses and 1 for 64-bit accesses.
*/
extern int mips_cm_is64;
/**
* mips_cm_error_report - Report CM cache errors
*/
#ifdef CONFIG_MIPS_CM
extern void mips_cm_error_report(void);
#else
static inline void mips_cm_error_report(void) {}
#endif
/**
* mips_cm_probe - probe for a Coherence Manager
*
* Attempt to detect the presence of a Coherence Manager. Returns 0 if a CM
* is successfully detected, else -errno.
*/
#ifdef CONFIG_MIPS_CM
extern int mips_cm_probe(void);
#else
static inline int mips_cm_probe(void)
{
return -ENODEV;
}
#endif
/**
* mips_cm_present - determine whether a Coherence Manager is present
*
* Returns true if a CM is present in the system, else false.
*/
static inline bool mips_cm_present(void)
{
#ifdef CONFIG_MIPS_CM
return mips_cm_base != NULL;
#else
return false;
#endif
}
/**
* mips_cm_has_l2sync - determine whether an L2-only sync region is present
*
* Returns true if the system implements an L2-only sync region, else false.
*/
static inline bool mips_cm_has_l2sync(void)
{
#ifdef CONFIG_MIPS_CM
return mips_cm_l2sync_base != NULL;
#else
return false;
#endif
}
/* Offsets to register blocks from the CM base address */
#define MIPS_CM_GCB_OFS 0x0000 /* Global Control Block */
#define MIPS_CM_CLCB_OFS 0x2000 /* Core Local Control Block */
#define MIPS_CM_COCB_OFS 0x4000 /* Core Other Control Block */
#define MIPS_CM_GDB_OFS 0x6000 /* Global Debug Block */
/* Total size of the CM memory mapped registers */
#define MIPS_CM_GCR_SIZE 0x8000
/* Size of the L2-only sync region */
#define MIPS_CM_L2SYNC_SIZE 0x1000
/* Macros to ease the creation of register access functions */
#define BUILD_CM_R_(name, off) \
static inline unsigned long __iomem *addr_gcr_##name(void) \
{ \
return (unsigned long __iomem *)(mips_cm_base + (off)); \
} \
\
static inline u32 read32_gcr_##name(void) \
{ \
return __raw_readl(addr_gcr_##name()); \
} \
\
static inline u64 read64_gcr_##name(void) \
{ \
void __iomem *addr = addr_gcr_##name(); \
u64 ret; \
\
if (mips_cm_is64) { \
ret = __raw_readq(addr); \
} else { \
ret = __raw_readl(addr); \
ret |= (u64)__raw_readl(addr + 0x4) << 32; \
} \
\
return ret; \
} \
\
static inline unsigned long read_gcr_##name(void) \
{ \
if (mips_cm_is64) \
return read64_gcr_##name(); \
else \
return read32_gcr_##name(); \
}
#define BUILD_CM__W(name, off) \
static inline void write32_gcr_##name(u32 value) \
{ \
__raw_writel(value, addr_gcr_##name()); \
} \
\
static inline void write64_gcr_##name(u64 value) \
{ \
__raw_writeq(value, addr_gcr_##name()); \
} \
\
static inline void write_gcr_##name(unsigned long value) \
{ \
if (mips_cm_is64) \
write64_gcr_##name(value); \
else \
write32_gcr_##name(value); \
}
#define BUILD_CM_RW(name, off) \
BUILD_CM_R_(name, off) \
BUILD_CM__W(name, off)
#define BUILD_CM_Cx_R_(name, off) \
BUILD_CM_R_(cl_##name, MIPS_CM_CLCB_OFS + (off)) \
BUILD_CM_R_(co_##name, MIPS_CM_COCB_OFS + (off))
#define BUILD_CM_Cx__W(name, off) \
BUILD_CM__W(cl_##name, MIPS_CM_CLCB_OFS + (off)) \
BUILD_CM__W(co_##name, MIPS_CM_COCB_OFS + (off))
#define BUILD_CM_Cx_RW(name, off) \
BUILD_CM_Cx_R_(name, off) \
BUILD_CM_Cx__W(name, off)
/* GCB register accessor functions */
BUILD_CM_R_(config, MIPS_CM_GCB_OFS + 0x00)
BUILD_CM_RW(base, MIPS_CM_GCB_OFS + 0x08)
BUILD_CM_RW(access, MIPS_CM_GCB_OFS + 0x20)
BUILD_CM_R_(rev, MIPS_CM_GCB_OFS + 0x30)
BUILD_CM_RW(error_mask, MIPS_CM_GCB_OFS + 0x40)
BUILD_CM_RW(error_cause, MIPS_CM_GCB_OFS + 0x48)
BUILD_CM_RW(error_addr, MIPS_CM_GCB_OFS + 0x50)
BUILD_CM_RW(error_mult, MIPS_CM_GCB_OFS + 0x58)
BUILD_CM_RW(l2_only_sync_base, MIPS_CM_GCB_OFS + 0x70)
BUILD_CM_RW(gic_base, MIPS_CM_GCB_OFS + 0x80)
BUILD_CM_RW(cpc_base, MIPS_CM_GCB_OFS + 0x88)
BUILD_CM_RW(reg0_base, MIPS_CM_GCB_OFS + 0x90)
BUILD_CM_RW(reg0_mask, MIPS_CM_GCB_OFS + 0x98)
BUILD_CM_RW(reg1_base, MIPS_CM_GCB_OFS + 0xa0)
BUILD_CM_RW(reg1_mask, MIPS_CM_GCB_OFS + 0xa8)
BUILD_CM_RW(reg2_base, MIPS_CM_GCB_OFS + 0xb0)
BUILD_CM_RW(reg2_mask, MIPS_CM_GCB_OFS + 0xb8)
BUILD_CM_RW(reg3_base, MIPS_CM_GCB_OFS + 0xc0)
BUILD_CM_RW(reg3_mask, MIPS_CM_GCB_OFS + 0xc8)
BUILD_CM_R_(gic_status, MIPS_CM_GCB_OFS + 0xd0)
BUILD_CM_R_(cpc_status, MIPS_CM_GCB_OFS + 0xf0)
BUILD_CM_RW(l2_config, MIPS_CM_GCB_OFS + 0x130)
BUILD_CM_RW(sys_config2, MIPS_CM_GCB_OFS + 0x150)
BUILD_CM_RW(l2_pft_control, MIPS_CM_GCB_OFS + 0x300)
BUILD_CM_RW(l2_pft_control_b, MIPS_CM_GCB_OFS + 0x308)
BUILD_CM_RW(bev_base, MIPS_CM_GCB_OFS + 0x680)
/* Core Local & Core Other register accessor functions */
BUILD_CM_Cx_RW(reset_release, 0x00)
BUILD_CM_Cx_RW(coherence, 0x08)
BUILD_CM_Cx_R_(config, 0x10)
BUILD_CM_Cx_RW(other, 0x18)
BUILD_CM_Cx_RW(reset_base, 0x20)
BUILD_CM_Cx_R_(id, 0x28)
BUILD_CM_Cx_RW(reset_ext_base, 0x30)
BUILD_CM_Cx_R_(tcid_0_priority, 0x40)
BUILD_CM_Cx_R_(tcid_1_priority, 0x48)
BUILD_CM_Cx_R_(tcid_2_priority, 0x50)
BUILD_CM_Cx_R_(tcid_3_priority, 0x58)
BUILD_CM_Cx_R_(tcid_4_priority, 0x60)
BUILD_CM_Cx_R_(tcid_5_priority, 0x68)
BUILD_CM_Cx_R_(tcid_6_priority, 0x70)
BUILD_CM_Cx_R_(tcid_7_priority, 0x78)
BUILD_CM_Cx_R_(tcid_8_priority, 0x80)
/* GCR_CONFIG register fields */
#define CM_GCR_CONFIG_NUMIOCU_SHF 8
#define CM_GCR_CONFIG_NUMIOCU_MSK (_ULCAST_(0xf) << 8)
#define CM_GCR_CONFIG_PCORES_SHF 0
#define CM_GCR_CONFIG_PCORES_MSK (_ULCAST_(0xff) << 0)
/* GCR_BASE register fields */
#define CM_GCR_BASE_GCRBASE_SHF 15
#define CM_GCR_BASE_GCRBASE_MSK (_ULCAST_(0x1ffff) << 15)
#define CM_GCR_BASE_CMDEFTGT_SHF 0
#define CM_GCR_BASE_CMDEFTGT_MSK (_ULCAST_(0x3) << 0)
#define CM_GCR_BASE_CMDEFTGT_DISABLED 0
#define CM_GCR_BASE_CMDEFTGT_MEM 1
#define CM_GCR_BASE_CMDEFTGT_IOCU0 2
#define CM_GCR_BASE_CMDEFTGT_IOCU1 3
/* GCR_RESET_EXT_BASE register fields */
#define CM_GCR_RESET_EXT_BASE_EVARESET BIT(31)
#define CM_GCR_RESET_EXT_BASE_UEB BIT(30)
/* GCR_ACCESS register fields */
#define CM_GCR_ACCESS_ACCESSEN_SHF 0
#define CM_GCR_ACCESS_ACCESSEN_MSK (_ULCAST_(0xff) << 0)
/* GCR_REV register fields */
#define CM_GCR_REV_MAJOR_SHF 8
#define CM_GCR_REV_MAJOR_MSK (_ULCAST_(0xff) << 8)
#define CM_GCR_REV_MINOR_SHF 0
#define CM_GCR_REV_MINOR_MSK (_ULCAST_(0xff) << 0)
#define CM_ENCODE_REV(major, minor) \
(((major) << CM_GCR_REV_MAJOR_SHF) | \
((minor) << CM_GCR_REV_MINOR_SHF))
#define CM_REV_CM2 CM_ENCODE_REV(6, 0)
#define CM_REV_CM2_5 CM_ENCODE_REV(7, 0)
#define CM_REV_CM3 CM_ENCODE_REV(8, 0)
/* GCR_ERROR_CAUSE register fields */
#define CM_GCR_ERROR_CAUSE_ERRTYPE_SHF 27
#define CM_GCR_ERROR_CAUSE_ERRTYPE_MSK (_ULCAST_(0x1f) << 27)
#define CM3_GCR_ERROR_CAUSE_ERRTYPE_SHF 58
#define CM3_GCR_ERROR_CAUSE_ERRTYPE_MSK GENMASK_ULL(63, 58)
#define CM_GCR_ERROR_CAUSE_ERRINFO_SHF 0
#define CM_GCR_ERROR_CAUSE_ERRINGO_MSK (_ULCAST_(0x7ffffff) << 0)
/* GCR_ERROR_MULT register fields */
#define CM_GCR_ERROR_MULT_ERR2ND_SHF 0
#define CM_GCR_ERROR_MULT_ERR2ND_MSK (_ULCAST_(0x1f) << 0)
/* GCR_L2_ONLY_SYNC_BASE register fields */
#define CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE_SHF 12
#define CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE_MSK (_ULCAST_(0xfffff) << 12)
#define CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN_SHF 0
#define CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN_MSK (_ULCAST_(0x1) << 0)
/* GCR_GIC_BASE register fields */
#define CM_GCR_GIC_BASE_GICBASE_SHF 17
#define CM_GCR_GIC_BASE_GICBASE_MSK (_ULCAST_(0x7fff) << 17)
#define CM_GCR_GIC_BASE_GICEN_SHF 0
#define CM_GCR_GIC_BASE_GICEN_MSK (_ULCAST_(0x1) << 0)
/* GCR_CPC_BASE register fields */
#define CM_GCR_CPC_BASE_CPCBASE_SHF 15
#define CM_GCR_CPC_BASE_CPCBASE_MSK (_ULCAST_(0x1ffff) << 15)
#define CM_GCR_CPC_BASE_CPCEN_SHF 0
#define CM_GCR_CPC_BASE_CPCEN_MSK (_ULCAST_(0x1) << 0)
/* GCR_GIC_STATUS register fields */
#define CM_GCR_GIC_STATUS_GICEX_SHF 0
#define CM_GCR_GIC_STATUS_GICEX_MSK (_ULCAST_(0x1) << 0)
/* GCR_REGn_BASE register fields */
#define CM_GCR_REGn_BASE_BASEADDR_SHF 16
#define CM_GCR_REGn_BASE_BASEADDR_MSK (_ULCAST_(0xffff) << 16)
/* GCR_REGn_MASK register fields */
#define CM_GCR_REGn_MASK_ADDRMASK_SHF 16
#define CM_GCR_REGn_MASK_ADDRMASK_MSK (_ULCAST_(0xffff) << 16)
#define CM_GCR_REGn_MASK_CCAOVR_SHF 5
#define CM_GCR_REGn_MASK_CCAOVR_MSK (_ULCAST_(0x3) << 5)
#define CM_GCR_REGn_MASK_CCAOVREN_SHF 4
#define CM_GCR_REGn_MASK_CCAOVREN_MSK (_ULCAST_(0x1) << 4)
#define CM_GCR_REGn_MASK_DROPL2_SHF 2
#define CM_GCR_REGn_MASK_DROPL2_MSK (_ULCAST_(0x1) << 2)
#define CM_GCR_REGn_MASK_CMTGT_SHF 0
#define CM_GCR_REGn_MASK_CMTGT_MSK (_ULCAST_(0x3) << 0)
#define CM_GCR_REGn_MASK_CMTGT_DISABLED (_ULCAST_(0x0) << 0)
#define CM_GCR_REGn_MASK_CMTGT_MEM (_ULCAST_(0x1) << 0)
#define CM_GCR_REGn_MASK_CMTGT_IOCU0 (_ULCAST_(0x2) << 0)
#define CM_GCR_REGn_MASK_CMTGT_IOCU1 (_ULCAST_(0x3) << 0)
/* GCR_GIC_STATUS register fields */
#define CM_GCR_GIC_STATUS_EX_SHF 0
#define CM_GCR_GIC_STATUS_EX_MSK (_ULCAST_(0x1) << 0)
/* GCR_CPC_STATUS register fields */
#define CM_GCR_CPC_STATUS_EX_SHF 0
#define CM_GCR_CPC_STATUS_EX_MSK (_ULCAST_(0x1) << 0)
/* GCR_L2_CONFIG register fields */
#define CM_GCR_L2_CONFIG_BYPASS_SHF 20
#define CM_GCR_L2_CONFIG_BYPASS_MSK (_ULCAST_(0x1) << 20)
#define CM_GCR_L2_CONFIG_SET_SIZE_SHF 12
#define CM_GCR_L2_CONFIG_SET_SIZE_MSK (_ULCAST_(0xf) << 12)
#define CM_GCR_L2_CONFIG_LINE_SIZE_SHF 8
#define CM_GCR_L2_CONFIG_LINE_SIZE_MSK (_ULCAST_(0xf) << 8)
#define CM_GCR_L2_CONFIG_ASSOC_SHF 0
#define CM_GCR_L2_CONFIG_ASSOC_MSK (_ULCAST_(0xff) << 0)
/* GCR_SYS_CONFIG2 register fields */
#define CM_GCR_SYS_CONFIG2_MAXVPW_SHF 0
#define CM_GCR_SYS_CONFIG2_MAXVPW_MSK (_ULCAST_(0xf) << 0)
/* GCR_L2_PFT_CONTROL register fields */
#define CM_GCR_L2_PFT_CONTROL_PAGEMASK_SHF 12
#define CM_GCR_L2_PFT_CONTROL_PAGEMASK_MSK (_ULCAST_(0xfffff) << 12)
#define CM_GCR_L2_PFT_CONTROL_PFTEN_SHF 8
#define CM_GCR_L2_PFT_CONTROL_PFTEN_MSK (_ULCAST_(0x1) << 8)
#define CM_GCR_L2_PFT_CONTROL_NPFT_SHF 0
#define CM_GCR_L2_PFT_CONTROL_NPFT_MSK (_ULCAST_(0xff) << 0)
/* GCR_L2_PFT_CONTROL_B register fields */
#define CM_GCR_L2_PFT_CONTROL_B_CEN_SHF 8
#define CM_GCR_L2_PFT_CONTROL_B_CEN_MSK (_ULCAST_(0x1) << 8)
#define CM_GCR_L2_PFT_CONTROL_B_PORTID_SHF 0
#define CM_GCR_L2_PFT_CONTROL_B_PORTID_MSK (_ULCAST_(0xff) << 0)
/* GCR_Cx_COHERENCE register fields */
#define CM_GCR_Cx_COHERENCE_COHDOMAINEN_SHF 0
#define CM_GCR_Cx_COHERENCE_COHDOMAINEN_MSK (_ULCAST_(0xff) << 0)
#define CM3_GCR_Cx_COHERENCE_COHEN_MSK (_ULCAST_(0x1) << 0)
/* GCR_Cx_CONFIG register fields */
#define CM_GCR_Cx_CONFIG_IOCUTYPE_SHF 10
#define CM_GCR_Cx_CONFIG_IOCUTYPE_MSK (_ULCAST_(0x3) << 10)
#define CM_GCR_Cx_CONFIG_PVPE_SHF 0
#define CM_GCR_Cx_CONFIG_PVPE_MSK (_ULCAST_(0x3ff) << 0)
/* GCR_Cx_OTHER register fields */
#define CM_GCR_Cx_OTHER_CORENUM_SHF 16
#define CM_GCR_Cx_OTHER_CORENUM_MSK (_ULCAST_(0xffff) << 16)
#define CM3_GCR_Cx_OTHER_CORE_SHF 8
#define CM3_GCR_Cx_OTHER_CORE_MSK (_ULCAST_(0x3f) << 8)
#define CM3_GCR_Cx_OTHER_VP_SHF 0
#define CM3_GCR_Cx_OTHER_VP_MSK (_ULCAST_(0x7) << 0)
/* GCR_Cx_RESET_BASE register fields */
#define CM_GCR_Cx_RESET_BASE_BEVEXCBASE_SHF 12
#define CM_GCR_Cx_RESET_BASE_BEVEXCBASE_MSK (_ULCAST_(0xfffff) << 12)
/* GCR_Cx_RESET_EXT_BASE register fields */
#define CM_GCR_Cx_RESET_EXT_BASE_EVARESET_SHF 31
#define CM_GCR_Cx_RESET_EXT_BASE_EVARESET_MSK (_ULCAST_(0x1) << 31)
#define CM_GCR_Cx_RESET_EXT_BASE_UEB_SHF 30
#define CM_GCR_Cx_RESET_EXT_BASE_UEB_MSK (_ULCAST_(0x1) << 30)
#define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCMASK_SHF 20
#define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCMASK_MSK (_ULCAST_(0xff) << 20)
#define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCPA_SHF 1
#define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCPA_MSK (_ULCAST_(0x7f) << 1)
#define CM_GCR_Cx_RESET_EXT_BASE_PRESENT_SHF 0
#define CM_GCR_Cx_RESET_EXT_BASE_PRESENT_MSK (_ULCAST_(0x1) << 0)
/**
* mips_cm_numcores - return the number of cores present in the system
*
* Returns the value of the PCORES field of the GCR_CONFIG register plus 1, or
* zero if no Coherence Manager is present.
*/
static inline unsigned mips_cm_numcores(void)
{
if (!mips_cm_present())
return 0;
return ((read_gcr_config() & CM_GCR_CONFIG_PCORES_MSK)
>> CM_GCR_CONFIG_PCORES_SHF) + 1;
}
/**
* mips_cm_numiocu - return the number of IOCUs present in the system
*
* Returns the value of the NUMIOCU field of the GCR_CONFIG register, or zero
* if no Coherence Manager is present.
*/
static inline unsigned mips_cm_numiocu(void)
{
if (!mips_cm_present())
return 0;
return (read_gcr_config() & CM_GCR_CONFIG_NUMIOCU_MSK)
>> CM_GCR_CONFIG_NUMIOCU_SHF;
}
/**
* mips_cm_l2sync - perform an L2-only sync operation
*
* If an L2-only sync region is present in the system then this function
* performs and L2-only sync and returns zero. Otherwise it returns -ENODEV.
*/
static inline int mips_cm_l2sync(void)
{
if (!mips_cm_has_l2sync())
return -ENODEV;
writel(0, mips_cm_l2sync_base);
return 0;
}
/**
* mips_cm_revision() - return CM revision
*
* Return: The revision of the CM, from GCR_REV, or 0 if no CM is present. The
* return value should be checked against the CM_REV_* macros.
*/
static inline int mips_cm_revision(void)
{
if (!mips_cm_present())
return 0;
return read_gcr_rev();
}
/**
* mips_cm_max_vp_width() - return the width in bits of VP indices
*
* Return: the width, in bits, of VP indices in fields that combine core & VP
* indices.
*/
static inline unsigned int mips_cm_max_vp_width(void)
{
extern int smp_num_siblings;
uint32_t cfg;
if (mips_cm_revision() >= CM_REV_CM3)
return read_gcr_sys_config2() & CM_GCR_SYS_CONFIG2_MAXVPW_MSK;
if (mips_cm_present()) {
/*
* We presume that all cores in the system will have the same
* number of VP(E)s, and if that ever changes then this will
* need revisiting.
*/
cfg = read_gcr_cl_config() & CM_GCR_Cx_CONFIG_PVPE_MSK;
return (cfg >> CM_GCR_Cx_CONFIG_PVPE_SHF) + 1;
}
if (IS_ENABLED(CONFIG_SMP))
return smp_num_siblings;
return 1;
}
/**
* mips_cm_vp_id() - calculate the hardware VP ID for a CPU
* @cpu: the CPU whose VP ID to calculate
*
* Hardware such as the GIC uses identifiers for VPs which may not match the
* CPU numbers used by Linux. This function calculates the hardware VP
* identifier corresponding to a given CPU.
*
* Return: the VP ID for the CPU.
*/
static inline unsigned int mips_cm_vp_id(unsigned int cpu)
{
unsigned int core = cpu_data[cpu].core;
unsigned int vp = cpu_vpe_id(&cpu_data[cpu]);
return (core * mips_cm_max_vp_width()) + vp;
}
#ifdef CONFIG_MIPS_CM
/**
* mips_cm_lock_other - lock access to another core
* @core: the other core to be accessed
* @vp: the VP within the other core to be accessed
*
* Call before operating upon a core via the 'other' register region in
* order to prevent the region being moved during access. Must be followed
* by a call to mips_cm_unlock_other.
*/
extern void mips_cm_lock_other(unsigned int core, unsigned int vp);
/**
* mips_cm_unlock_other - unlock access to another core
*
* Call after operating upon another core via the 'other' register region.
* Must be called after mips_cm_lock_other.
*/
extern void mips_cm_unlock_other(void);
#else /* !CONFIG_MIPS_CM */
static inline void mips_cm_lock_other(unsigned int core, unsigned int vp) { }
static inline void mips_cm_unlock_other(void) { }
#endif /* !CONFIG_MIPS_CM */
#endif /* __MIPS_ASM_MIPS_CM_H__ */
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