ARC: add support for DSP-enabled userspace applications (7321e2ea) · Commits · 戴 / test

arch/arc/Kconfig

+12 −0

Original line number	Diff line number	Diff line
		@@ -411,6 +411,9 @@ config ARC_HAS_ACCL_REGS
		config ARC_DSP_HANDLED
		def_bool n

		config ARC_DSP_SAVE_RESTORE_REGS
		def_bool n

		choice
		prompt "DSP support"
		default ARC_DSP_NONE
		@@ -433,6 +436,15 @@ config ARC_DSP_KERNEL
		DSP extension presence in HW, no support for DSP-enabled userspace
		applications. We don't save / restore DSP registers and only do
		some minimal preparations so userspace won't be able to break kernel

		config ARC_DSP_USERSPACE
		bool "Support DSP for userspace apps"
		select ARC_HAS_ACCL_REGS
		select ARC_DSP_HANDLED
		select ARC_DSP_SAVE_RESTORE_REGS
		help
		DSP extension presence in HW, support save / restore DSP registers to
		run DSP-enabled userspace applications
		endchoice

		config ARC_IRQ_NO_AUTOSAVE

arch/arc/include/asm/arcregs.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -120,6 +120,8 @@

		/*
		* DSP-related registers
		* Registers names must correspond to dsp_callee_regs structure fields names
		* for automatic offset calculation in DSP_AUX_SAVE_RESTORE macros.
		*/
		#define ARC_AUX_DSP_BUILD 0x7A
		#define ARC_AUX_ACC0_LO 0x580

arch/arc/include/asm/dsp-impl.h

+73 −1

Original line number	Diff line number	Diff line
		@@ -7,6 +7,8 @@
		#ifndef __ASM_ARC_DSP_IMPL_H
		#define __ASM_ARC_DSP_IMPL_H

		#include <asm/dsp.h>

		#define DSP_CTRL_DISABLED_ALL 0

		#ifdef __ASSEMBLY__
		@@ -30,12 +32,82 @@
		*/
		mov r10, DSP_CTRL_DISABLED_ALL
		sr r10, [ARC_AUX_DSP_CTRL]
		#endif /* ARC_DSP_KERNEL */

		#elif defined(CONFIG_ARC_DSP_SAVE_RESTORE_REGS)
		/*
		* Save DSP_CTRL register and reset it to value suitable for kernel
		* (DSP_CTRL_DISABLED_ALL)
		*/
		mov r10, DSP_CTRL_DISABLED_ALL
		aex r10, [ARC_AUX_DSP_CTRL]
		st r10, [sp, PT_DSP_CTRL]

		#endif
		.endm

		/* clobbers r10, r11 registers pair */
		.macro DSP_RESTORE_REGFILE_IRQ
		#if defined(CONFIG_ARC_DSP_SAVE_RESTORE_REGS)
		ld r10, [sp, PT_DSP_CTRL]
		sr r10, [ARC_AUX_DSP_CTRL]

		#endif
		.endm

		#else /* __ASEMBLY__ */

		#include <linux/sched.h>
		#include <asm/asserts.h>
		#include <asm/switch_to.h>

		#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS

		/*
		* As we save new and restore old AUX register value in the same place we
		* can optimize a bit and use AEX instruction (swap contents of an auxiliary
		* register with a core register) instead of LR + SR pair.
		*/
		#define AUX_SAVE_RESTORE(_saveto, _readfrom, _offt, _aux) \
		do { \
		long unsigned int _scratch; \
		\
		__asm__ __volatile__( \
		"ld %0, [%2, %4] \n" \
		"aex %0, [%3] \n" \
		"st %0, [%1, %4] \n" \
		: \
		"=&r" (_scratch) /* must be early clobber */ \
		: \
		"r" (_saveto), \
		"r" (_readfrom), \
		"Ir" (_aux), \
		"Ir" (_offt) \
		: \
		"memory" \
		); \
		} while (0)

		#define DSP_AUX_SAVE_RESTORE(_saveto, _readfrom, _aux) \
		AUX_SAVE_RESTORE(_saveto, _readfrom, \
		offsetof(struct dsp_callee_regs, _aux), \
		ARC_AUX_##_aux)

		static inline void dsp_save_restore(struct task_struct *prev,
		struct task_struct *next)
		{
		long unsigned int *saveto = &prev->thread.dsp.ACC0_GLO;
		long unsigned int *readfrom = &next->thread.dsp.ACC0_GLO;

		DSP_AUX_SAVE_RESTORE(saveto, readfrom, ACC0_GLO);
		DSP_AUX_SAVE_RESTORE(saveto, readfrom, ACC0_GHI);

		DSP_AUX_SAVE_RESTORE(saveto, readfrom, DSP_BFLY0);
		DSP_AUX_SAVE_RESTORE(saveto, readfrom, DSP_FFT_CTRL);
		}

		#else /* !CONFIG_ARC_DSP_SAVE_RESTORE_REGS */
		#define dsp_save_restore(p, n)
		#endif /* CONFIG_ARC_DSP_SAVE_RESTORE_REGS */

		static inline bool dsp_exist(void)
		{

arch/arc/include/asm/dsp.h

0 → 100644

+24 −0

Original line number	Diff line number	Diff line
		/* SPDX-License-Identifier: GPL-2.0-only */
		/*
		* Copyright (C) 2020 Synopsys, Inc. (www.synopsys.com)
		*
		* Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
		*/
		#ifndef __ASM_ARC_DSP_H
		#define __ASM_ARC_DSP_H

		#ifndef __ASSEMBLY__

		/*
		* DSP-related saved registers - need to be saved only when you are
		* scheduled out.
		* structure fields name must correspond to aux register defenitions for
		* automatic offset calculation in DSP_AUX_SAVE_RESTORE macros
		*/
		struct dsp_callee_regs {
		unsigned long ACC0_GLO, ACC0_GHI, DSP_BFLY0, DSP_FFT_CTRL;
		};

		#endif /* !__ASSEMBLY__ */

		#endif /* __ASM_ARC_DSP_H */

arch/arc/include/asm/entry-arcv2.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -192,6 +192,9 @@
		ld r25, [sp, PT_user_r25]
		#endif

		/* clobbers r10, r11 registers pair */
		DSP_RESTORE_REGFILE_IRQ

		#ifdef CONFIG_ARC_HAS_ACCL_REGS
		LD2 r58, r59, PT_r58
		#endif

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