Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2025 Intel Corporation
4 */
5
6#include <linux/fault-inject.h>
7
8#include "regs/xe_gsc_regs.h"
9#include "regs/xe_hw_error_regs.h"
10#include "regs/xe_irq_regs.h"
11
12#include "xe_device.h"
13#include "xe_hw_error.h"
14#include "xe_mmio.h"
15#include "xe_survivability_mode.h"
16
17#define HEC_UNCORR_FW_ERR_BITS 4
18extern struct fault_attr inject_csc_hw_error;
19
20/* Error categories reported by hardware */
21enum hardware_error {
22 HARDWARE_ERROR_CORRECTABLE = 0,
23 HARDWARE_ERROR_NONFATAL = 1,
24 HARDWARE_ERROR_FATAL = 2,
25 HARDWARE_ERROR_MAX,
26};
27
28static const char * const hec_uncorrected_fw_errors[] = {
29 "Fatal",
30 "CSE Disabled",
31 "FD Corruption",
32 "Data Corruption"
33};
34
35static const char *hw_error_to_str(const enum hardware_error hw_err)
36{
37 switch (hw_err) {
38 case HARDWARE_ERROR_CORRECTABLE:
39 return "CORRECTABLE";
40 case HARDWARE_ERROR_NONFATAL:
41 return "NONFATAL";
42 case HARDWARE_ERROR_FATAL:
43 return "FATAL";
44 default:
45 return "UNKNOWN";
46 }
47}
48
49static bool fault_inject_csc_hw_error(void)
50{
51 return IS_ENABLED(CONFIG_DEBUG_FS) && should_fail(&inject_csc_hw_error, 1);
52}
53
54static void csc_hw_error_work(struct work_struct *work)
55{
56 struct xe_tile *tile = container_of(work, typeof(*tile), csc_hw_error_work);
57 struct xe_device *xe = tile_to_xe(tile);
58 int ret;
59
60 ret = xe_survivability_mode_runtime_enable(xe);
61 if (ret)
62 drm_err(&xe->drm, "Failed to enable runtime survivability mode\n");
63}
64
65static void csc_hw_error_handler(struct xe_tile *tile, const enum hardware_error hw_err)
66{
67 const char *hw_err_str = hw_error_to_str(hw_err);
68 struct xe_device *xe = tile_to_xe(tile);
69 struct xe_mmio *mmio = &tile->mmio;
70 u32 base, err_bit, err_src;
71 unsigned long fw_err;
72
73 if (xe->info.platform != XE_BATTLEMAGE)
74 return;
75
76 base = BMG_GSC_HECI1_BASE;
77 lockdep_assert_held(&xe->irq.lock);
78 err_src = xe_mmio_read32(mmio, HEC_UNCORR_ERR_STATUS(base));
79 if (!err_src) {
80 drm_err_ratelimited(&xe->drm, HW_ERR "Tile%d reported HEC_ERR_STATUS_%s blank\n",
81 tile->id, hw_err_str);
82 return;
83 }
84
85 if (err_src & UNCORR_FW_REPORTED_ERR) {
86 fw_err = xe_mmio_read32(mmio, HEC_UNCORR_FW_ERR_DW0(base));
87 for_each_set_bit(err_bit, &fw_err, HEC_UNCORR_FW_ERR_BITS) {
88 drm_err_ratelimited(&xe->drm, HW_ERR
89 "%s: HEC Uncorrected FW %s error reported, bit[%d] is set\n",
90 hw_err_str, hec_uncorrected_fw_errors[err_bit],
91 err_bit);
92
93 schedule_work(&tile->csc_hw_error_work);
94 }
95 }
96
97 xe_mmio_write32(mmio, HEC_UNCORR_ERR_STATUS(base), err_src);
98}
99
100static void hw_error_source_handler(struct xe_tile *tile, const enum hardware_error hw_err)
101{
102 const char *hw_err_str = hw_error_to_str(hw_err);
103 struct xe_device *xe = tile_to_xe(tile);
104 unsigned long flags;
105 u32 err_src;
106
107 if (xe->info.platform != XE_BATTLEMAGE)
108 return;
109
110 spin_lock_irqsave(&xe->irq.lock, flags);
111 err_src = xe_mmio_read32(&tile->mmio, DEV_ERR_STAT_REG(hw_err));
112 if (!err_src) {
113 drm_err_ratelimited(&xe->drm, HW_ERR "Tile%d reported DEV_ERR_STAT_%s blank!\n",
114 tile->id, hw_err_str);
115 goto unlock;
116 }
117
118 if (err_src & XE_CSC_ERROR)
119 csc_hw_error_handler(tile, hw_err);
120
121 xe_mmio_write32(&tile->mmio, DEV_ERR_STAT_REG(hw_err), err_src);
122
123unlock:
124 spin_unlock_irqrestore(&xe->irq.lock, flags);
125}
126
127/**
128 * xe_hw_error_irq_handler - irq handling for hw errors
129 * @tile: tile instance
130 * @master_ctl: value read from master interrupt register
131 *
132 * Xe platforms add three error bits to the master interrupt register to support error handling.
133 * These three bits are used to convey the class of error FATAL, NONFATAL, or CORRECTABLE.
134 * To process the interrupt, determine the source of error by reading the Device Error Source
135 * Register that corresponds to the class of error being serviced.
136 */
137void xe_hw_error_irq_handler(struct xe_tile *tile, const u32 master_ctl)
138{
139 enum hardware_error hw_err;
140
141 if (fault_inject_csc_hw_error())
142 schedule_work(&tile->csc_hw_error_work);
143
144 for (hw_err = 0; hw_err < HARDWARE_ERROR_MAX; hw_err++)
145 if (master_ctl & ERROR_IRQ(hw_err))
146 hw_error_source_handler(tile, hw_err);
147}
148
149/*
150 * Process hardware errors during boot
151 */
152static void process_hw_errors(struct xe_device *xe)
153{
154 struct xe_tile *tile;
155 u32 master_ctl;
156 u8 id;
157
158 for_each_tile(tile, xe, id) {
159 master_ctl = xe_mmio_read32(&tile->mmio, GFX_MSTR_IRQ);
160 xe_hw_error_irq_handler(tile, master_ctl);
161 xe_mmio_write32(&tile->mmio, GFX_MSTR_IRQ, master_ctl);
162 }
163}
164
165/**
166 * xe_hw_error_init - Initialize hw errors
167 * @xe: xe device instance
168 *
169 * Initialize and check for errors that occurred during boot
170 * prior to driver load
171 */
172void xe_hw_error_init(struct xe_device *xe)
173{
174 struct xe_tile *tile = xe_device_get_root_tile(xe);
175
176 if (!IS_DGFX(xe) || IS_SRIOV_VF(xe))
177 return;
178
179 INIT_WORK(&tile->csc_hw_error_work, csc_hw_error_work);
180
181 process_hw_errors(xe);
182}