tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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_regs.h"
9
10#include "xe_gt_sriov_pf.h"
11#include "xe_gt_sriov_pf_config.h"
12#include "xe_gt_sriov_pf_control.h"
13#include "xe_gt_sriov_pf_helpers.h"
14#include "xe_gt_sriov_pf_service.h"
15#include "xe_mmio.h"
16
17/*
18 * VF's metadata is maintained in the flexible array where:
19 * - entry [0] contains metadata for the PF (only if applicable),
20 * - entries [1..n] contain metadata for VF1..VFn::
21 *
22 * <--------------------------- 1 + total_vfs ----------->
23 * +-------+-------+-------+-----------------------+-------+
24 * | 0 | 1 | 2 | | n |
25 * +-------+-------+-------+-----------------------+-------+
26 * | PF | VF1 | VF2 | ... ... | VFn |
27 * +-------+-------+-------+-----------------------+-------+
28 */
29static int pf_alloc_metadata(struct xe_gt *gt)
30{
31 unsigned int num_vfs = xe_gt_sriov_pf_get_totalvfs(gt);
32
33 gt->sriov.pf.vfs = drmm_kcalloc(>_to_xe(gt)->drm, 1 + num_vfs,
34 sizeof(*gt->sriov.pf.vfs), GFP_KERNEL);
35 if (!gt->sriov.pf.vfs)
36 return -ENOMEM;
37
38 return 0;
39}
40
41/**
42 * xe_gt_sriov_pf_init_early - Prepare SR-IOV PF data structures on PF.
43 * @gt: the &xe_gt to initialize
44 *
45 * Early initialization of the PF data.
46 *
47 * Return: 0 on success or a negative error code on failure.
48 */
49int xe_gt_sriov_pf_init_early(struct xe_gt *gt)
50{
51 int err;
52
53 err = pf_alloc_metadata(gt);
54 if (err)
55 return err;
56
57 err = xe_gt_sriov_pf_service_init(gt);
58 if (err)
59 return err;
60
61 err = xe_gt_sriov_pf_control_init(gt);
62 if (err)
63 return err;
64
65 return 0;
66}
67
68static bool pf_needs_enable_ggtt_guest_update(struct xe_device *xe)
69{
70 return GRAPHICS_VERx100(xe) == 1200;
71}
72
73static void pf_enable_ggtt_guest_update(struct xe_gt *gt)
74{
75 xe_mmio_write32(gt, VIRTUAL_CTRL_REG, GUEST_GTT_UPDATE_EN);
76}
77
78/**
79 * xe_gt_sriov_pf_init_hw - Initialize SR-IOV hardware support.
80 * @gt: the &xe_gt to initialize
81 *
82 * On some platforms the PF must explicitly enable VF's access to the GGTT.
83 */
84void xe_gt_sriov_pf_init_hw(struct xe_gt *gt)
85{
86 if (pf_needs_enable_ggtt_guest_update(gt_to_xe(gt)))
87 pf_enable_ggtt_guest_update(gt);
88
89 xe_gt_sriov_pf_service_update(gt);
90}
91
92/**
93 * xe_gt_sriov_pf_restart - Restart SR-IOV support after a GT reset.
94 * @gt: the &xe_gt
95 *
96 * This function can only be called on PF.
97 */
98void xe_gt_sriov_pf_restart(struct xe_gt *gt)
99{
100 xe_gt_sriov_pf_config_restart(gt);
101 xe_gt_sriov_pf_control_restart(gt);
102}