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_sriov_regs.h" 9 10 #include "xe_gt_sriov_pf.h" 11 #include "xe_gt_sriov_pf_config.h" 12 #include "xe_gt_sriov_pf_helpers.h" 13 #include "xe_gt_sriov_pf_service.h" 14 #include "xe_mmio.h" 15 16 /* 17 * VF's metadata is maintained in the flexible array where: 18 * - entry [0] contains metadata for the PF (only if applicable), 19 * - entries [1..n] contain metadata for VF1..VFn:: 20 * 21 * <--------------------------- 1 + total_vfs -----------> 22 * +-------+-------+-------+-----------------------+-------+ 23 * | 0 | 1 | 2 | | n | 24 * +-------+-------+-------+-----------------------+-------+ 25 * | PF | VF1 | VF2 | ... ... | VFn | 26 * +-------+-------+-------+-----------------------+-------+ 27 */ 28 static int pf_alloc_metadata(struct xe_gt *gt) 29 { 30 unsigned int num_vfs = xe_gt_sriov_pf_get_totalvfs(gt); 31 32 gt->sriov.pf.vfs = drmm_kcalloc(>_to_xe(gt)->drm, 1 + num_vfs, 33 sizeof(*gt->sriov.pf.vfs), GFP_KERNEL); 34 if (!gt->sriov.pf.vfs) 35 return -ENOMEM; 36 37 return 0; 38 } 39 40 /** 41 * xe_gt_sriov_pf_init_early - Prepare SR-IOV PF data structures on PF. 42 * @gt: the &xe_gt to initialize 43 * 44 * Early initialization of the PF data. 45 * 46 * Return: 0 on success or a negative error code on failure. 47 */ 48 int xe_gt_sriov_pf_init_early(struct xe_gt *gt) 49 { 50 int err; 51 52 err = pf_alloc_metadata(gt); 53 if (err) 54 return err; 55 56 err = xe_gt_sriov_pf_service_init(gt); 57 if (err) 58 return err; 59 60 return 0; 61 } 62 63 static bool pf_needs_enable_ggtt_guest_update(struct xe_device *xe) 64 { 65 return GRAPHICS_VERx100(xe) == 1200; 66 } 67 68 static void pf_enable_ggtt_guest_update(struct xe_gt *gt) 69 { 70 xe_mmio_write32(gt, VIRTUAL_CTRL_REG, GUEST_GTT_UPDATE_EN); 71 } 72 73 /** 74 * xe_gt_sriov_pf_init_hw - Initialize SR-IOV hardware support. 75 * @gt: the &xe_gt to initialize 76 * 77 * On some platforms the PF must explicitly enable VF's access to the GGTT. 78 */ 79 void xe_gt_sriov_pf_init_hw(struct xe_gt *gt) 80 { 81 if (pf_needs_enable_ggtt_guest_update(gt_to_xe(gt))) 82 pf_enable_ggtt_guest_update(gt); 83 84 xe_gt_sriov_pf_service_update(gt); 85 } 86 87 /** 88 * xe_gt_sriov_pf_restart - Restart SR-IOV support after a GT reset. 89 * @gt: the &xe_gt 90 * 91 * This function can only be called on PF. 92 */ 93 void xe_gt_sriov_pf_restart(struct xe_gt *gt) 94 { 95 xe_gt_sriov_pf_config_restart(gt); 96 } 97