1 What: /sys/firmware/acpi/fpdt/ <<
2 Date: Jan 2021 <<
3 Contact: Zhang Rui <rui.zhang@intel.com> <<
4 Description: <<
5 ACPI Firmware Performance Data <<
6 information for firmware perfo <<
7 S3 suspend and S3 resume. This <<
8 performance data retrieved fro <<
9 <<
10 boot: <<
11 firmware_start_ns: Tim <<
12 of firmware im <<
13 bootloader_load_ns: Ti <<
14 loading the OS <<
15 In nanoseconds <<
16 bootloader_launch_ns: <<
17 launching the <<
18 image. In nano <<
19 exitbootservice_start_ <<
20 point when the <<
21 ExitBootServic <<
22 firmware. In n <<
23 exitbootservice_end_ns <<
24 just prior to <<
25 back from the <<
26 UEFI compatibl <<
27 suspend: <<
28 suspend_start_ns: Time <<
29 OS write to SL <<
30 nanoseconds. <<
31 suspend_end_ns: Timer <<
32 firmware write <<
33 hardware entry <<
34 resume: <<
35 resume_count: A count <<
36 since the last <<
37 resume_avg_ns: Average <<
38 logged since t <<
39 including the <<
40 resume_prev_ns: Timer <<
41 platform runti <<
42 handoff to the <<
43 <<
44 What: /sys/firmware/acpi/bgrt/ 1 What: /sys/firmware/acpi/bgrt/
45 Date: January 2012 2 Date: January 2012
46 Contact: Matthew Garrett <mjg@redhat.com 3 Contact: Matthew Garrett <mjg@redhat.com>
47 Description: 4 Description:
48 The BGRT is an ACPI 5.0 featur 5 The BGRT is an ACPI 5.0 feature that allows the OS
49 to obtain a copy of the firmwa 6 to obtain a copy of the firmware boot splash and
50 some associated metadata. This 7 some associated metadata. This is intended to be used
51 by boot splash applications in 8 by boot splash applications in order to interact with
52 the firmware boot splash in or 9 the firmware boot splash in order to avoid jarring
53 transitions. 10 transitions.
54 11
55 image: The image bitmap. Curre 12 image: The image bitmap. Currently a 32-bit BMP.
56 status: 1 if the image is vali 13 status: 1 if the image is valid, 0 if firmware invalidated it.
57 type: 0 indicates image is in 14 type: 0 indicates image is in BMP format.
58 <<
59 ======== ===================== <<
60 version: The version of the BG 15 version: The version of the BGRT. Currently 1.
61 xoffset: The number of pixels 16 xoffset: The number of pixels between the left of the screen
62 and the left edge of 17 and the left edge of the image.
63 yoffset: The number of pixels 18 yoffset: The number of pixels between the top of the screen
64 and the top edge of t 19 and the top edge of the image.
65 ======== ===================== <<
66 20
67 What: /sys/firmware/acpi/hotplug/ 21 What: /sys/firmware/acpi/hotplug/
68 Date: February 2013 22 Date: February 2013
69 Contact: Rafael J. Wysocki <rafael.j.wys 23 Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
70 Description: 24 Description:
71 There are separate hotplug pro 25 There are separate hotplug profiles for different classes of
72 devices supported by ACPI, suc 26 devices supported by ACPI, such as containers, memory modules,
73 processors, PCI root bridges e 27 processors, PCI root bridges etc. A hotplug profile for a given
74 class of devices is a collecti 28 class of devices is a collection of settings defining the way
75 that class of devices will be 29 that class of devices will be handled by the ACPI core hotplug
76 code. Those profiles are repr 30 code. Those profiles are represented in sysfs as subdirectories
77 of /sys/firmware/acpi/hotplug/ 31 of /sys/firmware/acpi/hotplug/.
78 32
79 The following setting is avail 33 The following setting is available to user space for each
80 hotplug profile: 34 hotplug profile:
81 35
82 ======== ===================== <<
83 enabled: If set, the ACPI core 36 enabled: If set, the ACPI core will handle notifications of
84 hotplug events associ !! 37 hotplug events associated with the given class of
85 devices and will allo !! 38 devices and will allow those devices to be ejected with
86 the help of the _EJ0 !! 39 the help of the _EJ0 control method. Unsetting it
87 effectively disables !! 40 effectively disables hotplug for the correspoinding
88 class of devices. !! 41 class of devices.
89 ======== ===================== <<
90 42
91 The value of the above attribu 43 The value of the above attribute is an integer number: 1 (set)
92 or 0 (unset). Attempts to wri 44 or 0 (unset). Attempts to write any other values to it will
93 cause -EINVAL to be returned. 45 cause -EINVAL to be returned.
94 46
95 What: /sys/firmware/acpi/interrupts/ 47 What: /sys/firmware/acpi/interrupts/
96 Date: February 2008 48 Date: February 2008
97 Contact: Len Brown <lenb@kernel.org> 49 Contact: Len Brown <lenb@kernel.org>
98 Description: 50 Description:
99 All ACPI interrupts are handle 51 All ACPI interrupts are handled via a single IRQ,
100 the System Control Interrupt ( 52 the System Control Interrupt (SCI), which appears
101 as "acpi" in /proc/interrupts. 53 as "acpi" in /proc/interrupts.
102 54
103 However, one of the main funct 55 However, one of the main functions of ACPI is to make
104 the platform understand random 56 the platform understand random hardware without
105 special driver support. So wh 57 special driver support. So while the SCI handles a few
106 well known (fixed feature) int 58 well known (fixed feature) interrupts sources, such
107 as the power button, it can al 59 as the power button, it can also handle a variable
108 number of a "General Purpose E 60 number of a "General Purpose Events" (GPE).
109 61
110 A GPE vectors to a specified h 62 A GPE vectors to a specified handler in AML, which
111 can do a anything the BIOS wri 63 can do a anything the BIOS writer wants from
112 OS context. GPE 0x12, for exa 64 OS context. GPE 0x12, for example, would vector
113 to a level or edge handler cal 65 to a level or edge handler called _L12 or _E12.
114 The handler may do its busines 66 The handler may do its business and return.
115 Or the handler may send send a 67 Or the handler may send send a Notify event
116 to a Linux device driver regis 68 to a Linux device driver registered on an ACPI device,
117 such as a battery, or a proces 69 such as a battery, or a processor.
118 70
119 To figure out where all the SC 71 To figure out where all the SCI's are coming from,
120 /sys/firmware/acpi/interrupts 72 /sys/firmware/acpi/interrupts contains a file listing
121 every possible source, and the 73 every possible source, and the count of how many
122 times it has triggered:: !! 74 times it has triggered.
123 75
124 $ cd /sys/firmware/acpi/inte !! 76 $ cd /sys/firmware/acpi/interrupts
125 $ grep . * !! 77 $ grep . *
126 error: 0 !! 78 error: 0
127 ff_gbl_lock: 0 enabl !! 79 ff_gbl_lock: 0 enable
128 ff_pmtimer: 0 invali !! 80 ff_pmtimer: 0 invalid
129 ff_pwr_btn: 0 enabl !! 81 ff_pwr_btn: 0 enable
130 ff_rt_clk: 2 disabl !! 82 ff_rt_clk: 2 disable
131 ff_slp_btn: 0 invali !! 83 ff_slp_btn: 0 invalid
132 gpe00: 0 invali !! 84 gpe00: 0 invalid
133 gpe01: 0 enabl !! 85 gpe01: 0 enable
134 gpe02: 108 enabl !! 86 gpe02: 108 enable
135 gpe03: 0 invali !! 87 gpe03: 0 invalid
136 gpe04: 0 invali !! 88 gpe04: 0 invalid
137 gpe05: 0 invali !! 89 gpe05: 0 invalid
138 gpe06: 0 enabl !! 90 gpe06: 0 enable
139 gpe07: 0 enabl !! 91 gpe07: 0 enable
140 gpe08: 0 invali !! 92 gpe08: 0 invalid
141 gpe09: 0 invali !! 93 gpe09: 0 invalid
142 gpe0A: 0 invali !! 94 gpe0A: 0 invalid
143 gpe0B: 0 invali !! 95 gpe0B: 0 invalid
144 gpe0C: 0 invali !! 96 gpe0C: 0 invalid
145 gpe0D: 0 invali !! 97 gpe0D: 0 invalid
146 gpe0E: 0 invali !! 98 gpe0E: 0 invalid
147 gpe0F: 0 invali !! 99 gpe0F: 0 invalid
148 gpe10: 0 invali !! 100 gpe10: 0 invalid
149 gpe11: 0 invali !! 101 gpe11: 0 invalid
150 gpe12: 0 invali !! 102 gpe12: 0 invalid
151 gpe13: 0 invali !! 103 gpe13: 0 invalid
152 gpe14: 0 invali !! 104 gpe14: 0 invalid
153 gpe15: 0 invali !! 105 gpe15: 0 invalid
154 gpe16: 0 invali !! 106 gpe16: 0 invalid
155 gpe17: 1084 enabl !! 107 gpe17: 1084 enable
156 gpe18: 0 enabl !! 108 gpe18: 0 enable
157 gpe19: 0 invali !! 109 gpe19: 0 invalid
158 gpe1A: 0 invali !! 110 gpe1A: 0 invalid
159 gpe1B: 0 invali !! 111 gpe1B: 0 invalid
160 gpe1C: 0 invali !! 112 gpe1C: 0 invalid
161 gpe1D: 0 invali !! 113 gpe1D: 0 invalid
162 gpe1E: 0 invali !! 114 gpe1E: 0 invalid
163 gpe1F: 0 invali !! 115 gpe1F: 0 invalid
164 gpe_all: 1192 !! 116 gpe_all: 1192
165 sci: 1194 !! 117 sci: 1194
166 sci_not: 0 !! 118 sci_not: 0
167 !! 119
168 =========== ================= !! 120 sci - The number of times the ACPI SCI
169 sci The number of tim !! 121 has been called and claimed an interrupt.
170 has been called a !! 122
171 !! 123 sci_not - The number of times the ACPI SCI
172 sci_not The number of tim !! 124 has been called and NOT claimed an interrupt.
173 has been called a !! 125
174 !! 126 gpe_all - count of SCI caused by GPEs.
175 gpe_all count of SCI caus !! 127
176 !! 128 gpeXX - count for individual GPE source
177 gpeXX count for individ !! 129
178 !! 130 ff_gbl_lock - Global Lock
179 ff_gbl_lock Global Lock !! 131
180 !! 132 ff_pmtimer - PM Timer
181 ff_pmtimer PM Timer !! 133
182 !! 134 ff_pwr_btn - Power Button
183 ff_pwr_btn Power Button !! 135
184 !! 136 ff_rt_clk - Real Time Clock
185 ff_rt_clk Real Time Clock !! 137
186 !! 138 ff_slp_btn - Sleep Button
187 ff_slp_btn Sleep Button !! 139
188 !! 140 error - an interrupt that can't be accounted for above.
189 error an interrupt that !! 141
190 !! 142 invalid: it's either a GPE or a Fixed Event that
191 invalid it's either a GPE !! 143 doesn't have an event handler.
192 doesn't have an e !! 144
193 !! 145 disable: the GPE/Fixed Event is valid but disabled.
194 disable the GPE/Fixed Eve <<
195 <<
196 enable the GPE/Fixed Eve <<
197 =========== ================= <<
198 146
199 Root has permission to clear a !! 147 enable: the GPE/Fixed Event is valid and enabled.
200 148
201 # echo 0 > gpe11 !! 149 Root has permission to clear any of these counters. Eg.
>> 150 # echo 0 > gpe11
202 151
203 All counters can be cleared by !! 152 All counters can be cleared by clearing the total "sci":
204 !! 153 # echo 0 > sci
205 # echo 0 > sci <<
206 154
207 None of these counters has an 155 None of these counters has an effect on the function
208 of the system, they are simply 156 of the system, they are simply statistics.
209 157
210 Besides this, user can also wr 158 Besides this, user can also write specific strings to these files
211 to enable/disable/clear ACPI i 159 to enable/disable/clear ACPI interrupts in user space, which can be
212 used to debug some ACPI interr 160 used to debug some ACPI interrupt storm issues.
213 161
214 Note that only writing to VALI 162 Note that only writing to VALID GPE/Fixed Event is allowed,
215 i.e. user can only change the 163 i.e. user can only change the status of runtime GPE and
216 Fixed Event with event handler 164 Fixed Event with event handler installed.
217 165
218 Let's take power button fixed 166 Let's take power button fixed event for example, please kill acpid
219 and other user space applicati 167 and other user space applications so that the machine won't shutdown
220 when pressing the power button !! 168 when pressing the power button.
221 !! 169 # cat ff_pwr_btn
222 # cat ff_pwr_btn !! 170 0 enabled
223 0 enabled !! 171 # press the power button for 3 times;
224 # press the power button for !! 172 # cat ff_pwr_btn
225 # cat ff_pwr_btn !! 173 3 enabled
226 3 enabled !! 174 # echo disable > ff_pwr_btn
227 # echo disable > ff_pwr_btn !! 175 # cat ff_pwr_btn
228 # cat ff_pwr_btn !! 176 3 disabled
229 3 disabled !! 177 # press the power button for 3 times;
230 # press the power button for !! 178 # cat ff_pwr_btn
231 # cat ff_pwr_btn !! 179 3 disabled
232 3 disabled !! 180 # echo enable > ff_pwr_btn
233 # echo enable > ff_pwr_btn !! 181 # cat ff_pwr_btn
234 # cat ff_pwr_btn !! 182 4 enabled
235 4 enabled !! 183 /*
236 /* !! 184 * this is because the status bit is set even if the enable bit is cleared,
237 * this is because the statu !! 185 * and it triggers an ACPI fixed event when the enable bit is set again
238 * bit is cleared, and it tr !! 186 */
239 * the enable bit is set aga !! 187 # press the power button for 3 times;
240 */ !! 188 # cat ff_pwr_btn
241 # press the power button for !! 189 7 enabled
242 # cat ff_pwr_btn !! 190 # echo disable > ff_pwr_btn
243 7 enabled !! 191 # press the power button for 3 times;
244 # echo disable > ff_pwr_btn !! 192 # echo clear > ff_pwr_btn /* clear the status bit */
245 # press the power button for !! 193 # echo disable > ff_pwr_btn
246 # echo clear > ff_pwr_btn !! 194 # cat ff_pwr_btn
247 # echo disable > ff_pwr_btn !! 195 7 enabled
248 # cat ff_pwr_btn <<
249 7 enabled <<
250 196
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.