1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2023-2024 Intel Corporation 4 */ 5 6 #include <drm/drm_managed.h> 7 8 #include "regs/xe_guc_regs.h" 9 #include "regs/xe_regs.h" 10 11 #include "xe_gt.h" 12 #include "xe_gt_sriov_pf.h" 13 #include "xe_gt_sriov_pf_config.h" 14 #include "xe_gt_sriov_pf_control.h" 15 #include "xe_gt_sriov_pf_helpers.h" 16 #include "xe_gt_sriov_pf_migration.h" 17 #include "xe_gt_sriov_pf_service.h" 18 #include "xe_mmio.h" 19 20 /* 21 * VF's metadata is maintained in the flexible array where: 22 * - entry [0] contains metadata for the PF (only if applicable), 23 * - entries [1..n] contain metadata for VF1..VFn:: 24 * 25 * <--------------------------- 1 + total_vfs -----------> 26 * +-------+-------+-------+-----------------------+-------+ 27 * | 0 | 1 | 2 | | n | 28 * +-------+-------+-------+-----------------------+-------+ 29 * | PF | VF1 | VF2 | ... ... | VFn | 30 * +-------+-------+-------+-----------------------+-------+ 31 */ 32 static int pf_alloc_metadata(struct xe_gt *gt) 33 { 34 unsigned int num_vfs = xe_gt_sriov_pf_get_totalvfs(gt); 35 36 gt->sriov.pf.vfs = drmm_kcalloc(>_to_xe(gt)->drm, 1 + num_vfs, 37 sizeof(*gt->sriov.pf.vfs), GFP_KERNEL); 38 if (!gt->sriov.pf.vfs) 39 return -ENOMEM; 40 41 return 0; 42 } 43 44 /** 45 * xe_gt_sriov_pf_init_early - Prepare SR-IOV PF data structures on PF. 46 * @gt: the &xe_gt to initialize 47 * 48 * Early initialization of the PF data. 49 * 50 * Return: 0 on success or a negative error code on failure. 51 */ 52 int xe_gt_sriov_pf_init_early(struct xe_gt *gt) 53 { 54 int err; 55 56 err = pf_alloc_metadata(gt); 57 if (err) 58 return err; 59 60 err = xe_gt_sriov_pf_service_init(gt); 61 if (err) 62 return err; 63 64 err = xe_gt_sriov_pf_control_init(gt); 65 if (err) 66 return err; 67 68 return 0; 69 } 70 71 static bool pf_needs_enable_ggtt_guest_update(struct xe_device *xe) 72 { 73 return GRAPHICS_VERx100(xe) == 1200; 74 } 75 76 static void pf_enable_ggtt_guest_update(struct xe_gt *gt) 77 { 78 xe_mmio_write32(>->mmio, VIRTUAL_CTRL_REG, GUEST_GTT_UPDATE_EN); 79 } 80 81 /** 82 * xe_gt_sriov_pf_init_hw - Initialize SR-IOV hardware support. 83 * @gt: the &xe_gt to initialize 84 * 85 * On some platforms the PF must explicitly enable VF's access to the GGTT. 86 */ 87 void xe_gt_sriov_pf_init_hw(struct xe_gt *gt) 88 { 89 if (pf_needs_enable_ggtt_guest_update(gt_to_xe(gt))) 90 pf_enable_ggtt_guest_update(gt); 91 92 xe_gt_sriov_pf_service_update(gt); 93 xe_gt_sriov_pf_migration_init(gt); 94 } 95 96 static u32 pf_get_vf_regs_stride(struct xe_device *xe) 97 { 98 return GRAPHICS_VERx100(xe) > 1200 ? 0x400 : 0x1000; 99 } 100 101 static struct xe_reg xe_reg_vf_to_pf(struct xe_reg vf_reg, unsigned int vfid, u32 stride) 102 { 103 struct xe_reg pf_reg = vf_reg; 104 105 pf_reg.vf = 0; 106 pf_reg.addr += stride * vfid; 107 108 return pf_reg; 109 } 110 111 static void pf_clear_vf_scratch_regs(struct xe_gt *gt, unsigned int vfid) 112 { 113 u32 stride = pf_get_vf_regs_stride(gt_to_xe(gt)); 114 struct xe_reg scratch; 115 int n, count; 116 117 if (xe_gt_is_media_type(gt)) { 118 count = MED_VF_SW_FLAG_COUNT; 119 for (n = 0; n < count; n++) { 120 scratch = xe_reg_vf_to_pf(MED_VF_SW_FLAG(n), vfid, stride); 121 xe_mmio_write32(>->mmio, scratch, 0); 122 } 123 } else { 124 count = VF_SW_FLAG_COUNT; 125 for (n = 0; n < count; n++) { 126 scratch = xe_reg_vf_to_pf(VF_SW_FLAG(n), vfid, stride); 127 xe_mmio_write32(>->mmio, scratch, 0); 128 } 129 } 130 } 131 132 /** 133 * xe_gt_sriov_pf_sanitize_hw() - Reset hardware state related to a VF. 134 * @gt: the &xe_gt 135 * @vfid: the VF identifier 136 * 137 * This function can only be called on PF. 138 */ 139 void xe_gt_sriov_pf_sanitize_hw(struct xe_gt *gt, unsigned int vfid) 140 { 141 xe_gt_assert(gt, IS_SRIOV_PF(gt_to_xe(gt))); 142 143 pf_clear_vf_scratch_regs(gt, vfid); 144 } 145 146 /** 147 * xe_gt_sriov_pf_restart - Restart SR-IOV support after a GT reset. 148 * @gt: the &xe_gt 149 * 150 * This function can only be called on PF. 151 */ 152 void xe_gt_sriov_pf_restart(struct xe_gt *gt) 153 { 154 xe_gt_sriov_pf_config_restart(gt); 155 xe_gt_sriov_pf_control_restart(gt); 156 } 157