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