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f9209e2629
In subsequent patches, we'll want to make use of sve_user_enable() and sve_user_disable() outside of kernel/fpsimd.c. Let's move these to <asm/fpsimd.h> where we can make use of them. To avoid ifdeffery in sequences like: if (system_supports_sve() && some_condition) sve_user_disable(); ... empty stubs are provided when support for SVE is not enabled. Note that system_supports_sve() contains as IS_ENABLED(CONFIG_ARM64_SVE), so the sve_user_disable() call should be optimized away entirely when CONFIG_ARM64_SVE is not selected. To ensure that this is the case, the stub definitions contain a BUILD_BUG(), as we do for other stubs for which calls should always be optimized away when the relevant config option is not selected. At the same time, the include list of <asm/fpsimd.h> is sorted while adding <asm/sysreg.h>. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Dave Martin <dave.martin@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
160 lines
4.6 KiB
C
160 lines
4.6 KiB
C
/*
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_FP_H
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#define __ASM_FP_H
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#include <asm/errno.h>
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#include <asm/ptrace.h>
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#include <asm/processor.h>
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#include <asm/sigcontext.h>
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#include <asm/sysreg.h>
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#ifndef __ASSEMBLY__
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#include <linux/build_bug.h>
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#include <linux/cache.h>
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#include <linux/init.h>
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#include <linux/stddef.h>
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#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
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/* Masks for extracting the FPSR and FPCR from the FPSCR */
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#define VFP_FPSCR_STAT_MASK 0xf800009f
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#define VFP_FPSCR_CTRL_MASK 0x07f79f00
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/*
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* The VFP state has 32x64-bit registers and a single 32-bit
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* control/status register.
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*/
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#define VFP_STATE_SIZE ((32 * 8) + 4)
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#endif
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struct task_struct;
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extern void fpsimd_save_state(struct user_fpsimd_state *state);
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extern void fpsimd_load_state(struct user_fpsimd_state *state);
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extern void fpsimd_save(void);
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extern void fpsimd_thread_switch(struct task_struct *next);
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extern void fpsimd_flush_thread(void);
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extern void fpsimd_signal_preserve_current_state(void);
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extern void fpsimd_preserve_current_state(void);
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extern void fpsimd_restore_current_state(void);
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extern void fpsimd_update_current_state(struct user_fpsimd_state const *state);
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extern void fpsimd_bind_task_to_cpu(void);
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extern void fpsimd_bind_state_to_cpu(struct user_fpsimd_state *state);
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extern void fpsimd_flush_task_state(struct task_struct *target);
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extern void fpsimd_flush_cpu_state(void);
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extern void sve_flush_cpu_state(void);
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/* Maximum VL that SVE VL-agnostic software can transparently support */
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#define SVE_VL_ARCH_MAX 0x100
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/* Offset of FFR in the SVE register dump */
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static inline size_t sve_ffr_offset(int vl)
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{
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return SVE_SIG_FFR_OFFSET(sve_vq_from_vl(vl)) - SVE_SIG_REGS_OFFSET;
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}
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static inline void *sve_pffr(struct thread_struct *thread)
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{
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return (char *)thread->sve_state + sve_ffr_offset(thread->sve_vl);
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}
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extern void sve_save_state(void *state, u32 *pfpsr);
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extern void sve_load_state(void const *state, u32 const *pfpsr,
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unsigned long vq_minus_1);
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extern unsigned int sve_get_vl(void);
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struct arm64_cpu_capabilities;
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extern void sve_kernel_enable(const struct arm64_cpu_capabilities *__unused);
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extern u64 read_zcr_features(void);
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extern int __ro_after_init sve_max_vl;
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#ifdef CONFIG_ARM64_SVE
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extern size_t sve_state_size(struct task_struct const *task);
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extern void sve_alloc(struct task_struct *task);
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extern void fpsimd_release_task(struct task_struct *task);
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extern void fpsimd_sync_to_sve(struct task_struct *task);
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extern void sve_sync_to_fpsimd(struct task_struct *task);
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extern void sve_sync_from_fpsimd_zeropad(struct task_struct *task);
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extern int sve_set_vector_length(struct task_struct *task,
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unsigned long vl, unsigned long flags);
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extern int sve_set_current_vl(unsigned long arg);
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extern int sve_get_current_vl(void);
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static inline void sve_user_disable(void)
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{
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sysreg_clear_set(cpacr_el1, CPACR_EL1_ZEN_EL0EN, 0);
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}
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static inline void sve_user_enable(void)
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{
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sysreg_clear_set(cpacr_el1, 0, CPACR_EL1_ZEN_EL0EN);
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}
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/*
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* Probing and setup functions.
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* Calls to these functions must be serialised with one another.
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*/
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extern void __init sve_init_vq_map(void);
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extern void sve_update_vq_map(void);
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extern int sve_verify_vq_map(void);
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extern void __init sve_setup(void);
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#else /* ! CONFIG_ARM64_SVE */
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static inline void sve_alloc(struct task_struct *task) { }
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static inline void fpsimd_release_task(struct task_struct *task) { }
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static inline void sve_sync_to_fpsimd(struct task_struct *task) { }
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static inline void sve_sync_from_fpsimd_zeropad(struct task_struct *task) { }
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static inline int sve_set_current_vl(unsigned long arg)
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{
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return -EINVAL;
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}
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static inline int sve_get_current_vl(void)
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{
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return -EINVAL;
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}
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static inline void sve_user_disable(void) { BUILD_BUG(); }
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static inline void sve_user_enable(void) { BUILD_BUG(); }
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static inline void sve_init_vq_map(void) { }
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static inline void sve_update_vq_map(void) { }
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static inline int sve_verify_vq_map(void) { return 0; }
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static inline void sve_setup(void) { }
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#endif /* ! CONFIG_ARM64_SVE */
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/* For use by EFI runtime services calls only */
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extern void __efi_fpsimd_begin(void);
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extern void __efi_fpsimd_end(void);
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#endif
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#endif
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