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Thu, 5 Mar 2020 20:03:01 +0000 (UTC) From: Eugeniy Paltsev To: linux-snps-arc@lists.infradead.org, Vineet Gupta Cc: linux-kernel@vger.kernel.org, Alexey Brodkin , Eugeniy Paltsev Subject: [PATCH v2 4/4] ARC: allow userspace DSP applications to use AGU extensions Date: Thu, 5 Mar 2020 23:02:52 +0300 Message-Id: <20200305200252.14278-5-Eugeniy.Paltsev@synopsys.com> X-Mailer: git-send-email 2.21.1 In-Reply-To: <20200305200252.14278-1-Eugeniy.Paltsev@synopsys.com> References: <20200305200252.14278-1-Eugeniy.Paltsev@synopsys.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org To be able to run DSP-enabled userspace applications with AGU (address generation unit) extensions we additionally need to save and restore following registers at context switch: * AGU_AP* * AGU_OS* * AGU_MOD* Signed-off-by: Eugeniy Paltsev --- arch/arc/Kconfig | 9 +++++++++ arch/arc/include/asm/arcregs.h | 12 ++++++++++++ arch/arc/include/asm/asserts.h | 10 ++++++++++ arch/arc/include/asm/dsp-impl.h | 24 ++++++++++++++++++++++++ arch/arc/include/asm/dsp.h | 5 +++++ arch/arc/kernel/setup.c | 6 ++++++ 6 files changed, 66 insertions(+) diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index eb3bcb206882..ff306246d0f8 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -445,6 +445,15 @@ config ARC_DSP_USERSPACE help DSP extension presence in HW, support save / restore DSP registers to run DSP-enabled userspace applications + +config ARC_DSP_AGU_USERSPACE + bool "Support DSP with AGU for userspace apps" + select ARC_HAS_ACCL_REGS + select ARC_DSP_HANDLED + select ARC_DSP_SAVE_RESTORE_REGS + help + DSP and AGU extensions presence in HW, support save / restore DSP + and AGU registers to run DSP-enabled userspace applications endchoice config ARC_IRQ_NO_AUTOSAVE diff --git a/arch/arc/include/asm/arcregs.h b/arch/arc/include/asm/arcregs.h index aee1ee263065..2162023195c5 100644 --- a/arch/arc/include/asm/arcregs.h +++ b/arch/arc/include/asm/arcregs.h @@ -132,6 +132,18 @@ #define ARC_AUX_DSP_CTRL 0x59F #define ARC_AUX_DSP_FFT_CTRL 0x59E +#define ARC_AUX_AGU_BUILD 0xCC +#define ARC_AUX_AGU_AP0 0x5C0 +#define ARC_AUX_AGU_AP1 0x5C1 +#define ARC_AUX_AGU_AP2 0x5C2 +#define ARC_AUX_AGU_AP3 0x5C3 +#define ARC_AUX_AGU_OS0 0x5D0 +#define ARC_AUX_AGU_OS1 0x5D1 +#define ARC_AUX_AGU_MOD0 0x5E0 +#define ARC_AUX_AGU_MOD1 0x5E1 +#define ARC_AUX_AGU_MOD2 0x5E2 +#define ARC_AUX_AGU_MOD3 0x5E3 + #ifndef __ASSEMBLY__ #include diff --git a/arch/arc/include/asm/asserts.h b/arch/arc/include/asm/asserts.h index 3314efbeb528..108f33be6aa5 100644 --- a/arch/arc/include/asm/asserts.h +++ b/arch/arc/include/asm/asserts.h @@ -10,6 +10,7 @@ /* Helpers to sanitize config options. */ void chk_opt_strict(char *opt_name, bool hw_exists, bool opt_ena); +void chk_opt_weak(char *opt_name, bool hw_exists, bool opt_ena); /* * Check required config option: @@ -21,4 +22,13 @@ void chk_opt_strict(char *opt_name, bool hw_exists, bool opt_ena); chk_opt_strict(#opt_name, hw_exists, IS_ENABLED(opt_name)); \ }) +/* + * Check optional config option: + * - panic in case of OPT enabled but corresponding HW absent. +*/ +#define CHK_OPT_WEAK(opt_name, hw_exists) \ +({ \ + chk_opt_weak(#opt_name, hw_exists, IS_ENABLED(opt_name)); \ +}) + #endif /* __ASM_ARC_ASSERTS_H */ diff --git a/arch/arc/include/asm/dsp-impl.h b/arch/arc/include/asm/dsp-impl.h index 8380f7bede81..e1aa212ca6eb 100644 --- a/arch/arc/include/asm/dsp-impl.h +++ b/arch/arc/include/asm/dsp-impl.h @@ -103,6 +103,21 @@ static inline void dsp_save_restore(struct task_struct *prev, DSP_AUX_SAVE_RESTORE(saveto, readfrom, DSP_BFLY0); DSP_AUX_SAVE_RESTORE(saveto, readfrom, DSP_FFT_CTRL); + +#ifdef CONFIG_ARC_DSP_AGU_USERSPACE + DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_AP0); + DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_AP1); + DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_AP2); + DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_AP3); + + DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_OS0); + DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_OS1); + + DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_MOD0); + DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_MOD1); + DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_MOD2); + DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_MOD3); +#endif /* CONFIG_ARC_DSP_AGU_USERSPACE */ } #else /* !CONFIG_ARC_DSP_SAVE_RESTORE_REGS */ @@ -117,9 +132,18 @@ static inline bool dsp_exist(void) return !!bcr.ver; } +static inline bool agu_exist(void) +{ + struct bcr_generic bcr; + + READ_BCR(ARC_AUX_AGU_BUILD, bcr); + return !!bcr.ver; +} + static inline void dsp_config_check(void) { CHK_OPT_STRICT(CONFIG_ARC_DSP_HANDLED, dsp_exist()); + CHK_OPT_WEAK(CONFIG_ARC_DSP_AGU_USERSPACE, agu_exist()); } #endif /* __ASEMBLY__ */ diff --git a/arch/arc/include/asm/dsp.h b/arch/arc/include/asm/dsp.h index b016f4d2a09f..202c78e56704 100644 --- a/arch/arc/include/asm/dsp.h +++ b/arch/arc/include/asm/dsp.h @@ -17,6 +17,11 @@ */ struct dsp_callee_regs { unsigned long ACC0_GLO, ACC0_GHI, DSP_BFLY0, DSP_FFT_CTRL; +#ifdef CONFIG_ARC_DSP_AGU_USERSPACE + unsigned long AGU_AP0, AGU_AP1, AGU_AP2, AGU_AP3; + unsigned long AGU_OS0, AGU_OS1; + unsigned long AGU_MOD0, AGU_MOD1, AGU_MOD2, AGU_MOD3; +#endif }; #endif /* !__ASSEMBLY__ */ diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c index 1ed1528d9045..b2b1cb645d9e 100644 --- a/arch/arc/kernel/setup.c +++ b/arch/arc/kernel/setup.c @@ -399,6 +399,12 @@ void chk_opt_strict(char *opt_name, bool hw_exists, bool opt_ena) panic("Disable %s, hardware NOT present\n", opt_name); } +void chk_opt_weak(char *opt_name, bool hw_exists, bool opt_ena) +{ + if (!hw_exists && opt_ena) + panic("Disable %s, hardware NOT present\n", opt_name); +} + static void arc_chk_core_config(void) { struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()]; -- 2.21.1