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_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 */
32static 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 */
52int 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
71static bool pf_needs_enable_ggtt_guest_update(struct xe_device *xe)
72{
73 return GRAPHICS_VERx100(xe) == 1200;
74}
75
76static 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 */
87void 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
96static u32 pf_get_vf_regs_stride(struct xe_device *xe)
97{
98 return GRAPHICS_VERx100(xe) > 1200 ? 0x400 : 0x1000;
99}
100
101static 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
111static 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 */
139void 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 */
152void 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}