1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2020 Google, Inc 4 */ 5 6 #ifndef __ADRENO_SMMU_PRIV_H 7 #define __ADRENO_SMMU_PRIV_H 8 9 #include <linux/io-pgtable.h> 10 11 /** 12 * struct adreno_smmu_fault_info - container for key fault information 13 * 14 * @far: The faulting IOVA from ARM_SMMU_CB_FAR 15 * @ttbr0: The current TTBR0 pagetable from ARM_SMMU_CB_TTBR0 16 * @contextidr: The value of ARM_SMMU_CB_CONTEXTIDR 17 * @fsr: The fault status from ARM_SMMU_CB_FSR 18 * @fsynr0: The value of FSYNR0 from ARM_SMMU_CB_FSYNR0 19 * @fsynr1: The value of FSYNR1 from ARM_SMMU_CB_FSYNR0 20 * @cbfrsynra: The value of CBFRSYNRA from ARM_SMMU_GR1_CBFRSYNRA(idx) 21 * 22 * This struct passes back key page fault information to the GPU driver 23 * through the get_fault_info function pointer. 24 * The GPU driver can use this information to print informative 25 * log messages and provide deeper GPU specific insight into the fault. 26 */ 27 struct adreno_smmu_fault_info { 28 u64 far; 29 u64 ttbr0; 30 u32 contextidr; 31 u32 fsr; 32 u32 fsynr0; 33 u32 fsynr1; 34 u32 cbfrsynra; 35 }; 36 37 /** 38 * struct adreno_smmu_priv - private interface between adreno-smmu and GPU 39 * 40 * @cookie: An opque token provided by adreno-smmu and passed 41 * back into the callbacks 42 * @get_ttbr1_cfg: Get the TTBR1 config for the GPUs context-bank 43 * @set_ttbr0_cfg: Set the TTBR0 config for the GPUs context bank. A 44 * NULL config disables TTBR0 translation, otherwise 45 * TTBR0 translation is enabled with the specified cfg 46 * @get_fault_info: Called by the GPU fault handler to get information about 47 * the fault 48 * @set_stall: Configure whether stall on fault (CFCFG) is enabled. Call 49 * before set_ttbr0_cfg(). If stalling on fault is enabled, 50 * the GPU driver must call resume_translation() 51 * @resume_translation: Resume translation after a fault 52 * 53 * 54 * The GPU driver (drm/msm) and adreno-smmu work together for controlling 55 * the GPU's SMMU instance. This is by necessity, as the GPU is directly 56 * updating the SMMU for context switches, while on the other hand we do 57 * not want to duplicate all of the initial setup logic from arm-smmu. 58 * 59 * This private interface is used for the two drivers to coordinate. The 60 * cookie and callback functions are populated when the GPU driver attaches 61 * it's domain. 62 */ 63 struct adreno_smmu_priv { 64 const void *cookie; 65 const struct io_pgtable_cfg *(*get_ttbr1_cfg)(const void *cookie); 66 int (*set_ttbr0_cfg)(const void *cookie, const struct io_pgtable_cfg *cfg); 67 void (*get_fault_info)(const void *cookie, struct adreno_smmu_fault_info *info); 68 void (*set_stall)(const void *cookie, bool enabled); 69 void (*resume_translation)(const void *cookie, bool terminate); 70 }; 71 72 #endif /* __ADRENO_SMMU_PRIV_H */ 73