aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/boot/dts/bcm-cygnus.dtsi
blob: 2c4df2d2d4a6e1165fe27565a19d681c47a32cfa (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
/*
 *  BSD LICENSE
 *
 *  Copyright(c) 2014 Broadcom Corporation.  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *    * Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in
 *      the documentation and/or other materials provided with the
 *      distribution.
 *    * Neither the name of Broadcom Corporation nor the names of its
 *      contributors may be used to endorse or promote products derived
 *      from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <dt-bindings/interrupt-controller/arm-gic.h>
#include <dt-bindings/interrupt-controller/irq.h>
#include <dt-bindings/clock/bcm-cygnus.h>

#include "skeleton.dtsi"

/ {
	compatible = "brcm,cygnus";
	model = "Broadcom Cygnus SoC";
	interrupt-parent = <&gic>;

	cpus {
		#address-cells = <1>;
		#size-cells = <0>;

		cpu@0 {
			device_type = "cpu";
			compatible = "arm,cortex-a9";
			next-level-cache = <&L2>;
			reg = <0x0>;
		};
	};

	/include/ "bcm-cygnus-clock.dtsi"

	pmu {
		compatible = "arm,cortex-a9-pmu";
		interrupts = <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>;
	};

	core {
		compatible = "simple-bus";
		ranges = <0x00000000 0x19000000 0x1000000>;
		#address-cells = <1>;
		#size-cells = <1>;

		timer@20200 {
			compatible = "arm,cortex-a9-global-timer";
			reg = <0x20200 0x100>;
			interrupts = <GIC_PPI 11 IRQ_TYPE_EDGE_RISING>;
			clocks = <&periph_clk>;
		};

		gic: interrupt-controller@21000 {
			compatible = "arm,cortex-a9-gic";
			#interrupt-cells = <3>;
			#address-cells = <0>;
			interrupt-controller;
			reg = <0x21000 0x1000>,
			      <0x20100 0x100>;
		};

		L2: l2-cache {
			compatible = "arm,pl310-cache";
			reg = <0x22000 0x1000>;
			cache-unified;
			cache-level = <2>;
		};
	};

	axi {
		compatible = "simple-bus";
		ranges;
		#address-cells = <1>;
		#size-cells = <1>;

		otp: otp@301c800 {
			compatible = "brcm,ocotp";
			reg = <0x0301c800 0x2c>;
			brcm,ocotp-size = <2048>;
			status = "disabled";
		};

		pcie_phy: phy@301d0a0 {
			compatible = "brcm,cygnus-pcie-phy";
			reg = <0x0301d0a0 0x14>;
			#address-cells = <1>;
			#size-cells = <0>;

			pcie0_phy: phy@0 {
				reg = <0>;
				#phy-cells = <0>;
			};

			pcie1_phy: phy@1 {
				reg = <1>;
				#phy-cells = <0>;
			};
		};

		pinctrl: pinctrl@301d0c8 {
			compatible = "brcm,cygnus-pinmux";
			reg = <0x0301d0c8 0x30>,
			      <0x0301d24c 0x2c>;

			spi_0: spi_0 {
				function = "spi0";
				groups = "spi0_grp";
			};

			spi_1: spi_1 {
				function = "spi1";
				groups = "spi1_grp";
			};

			spi_2: spi_2 {
				function = "spi2";
				groups = "spi2_grp";
			};
		};

		mailbox: mailbox@3024024 {
			compatible = "brcm,iproc-mailbox";
			reg = <0x03024024 0x40>;
			interrupts = <GIC_SPI 138 IRQ_TYPE_LEVEL_HIGH>;
			#interrupt-cells = <1>;
			interrupt-controller;
			#mbox-cells = <1>;
		};

		gpio_crmu: gpio@3024800 {
			compatible = "brcm,cygnus-crmu-gpio";
			reg = <0x03024800 0x50>,
			      <0x03024008 0x18>;
			ngpios = <6>;
			#gpio-cells = <2>;
			gpio-controller;
			interrupt-controller;
			interrupt-parent = <&mailbox>;
			interrupts = <0>;
		};

		mdio: mdio@18002000 {
			compatible = "brcm,iproc-mdio";
			reg = <0x18002000 0x8>;
			#size-cells = <1>;
			#address-cells = <0>;
			status = "disabled";

			gphy0: ethernet-phy@0 {
				reg = <0>;
			};

			gphy1: ethernet-phy@1 {
				reg = <1>;
			};
		};

		switch: switch@18007000 {
			compatible = "brcm,bcm11360-srab", "brcm,cygnus-srab";
			reg = <0x18007000 0x1000>;
			status = "disabled";

			ports {
				#address-cells = <1>;
				#size-cells = <0>;

				port@0 {
					reg = <0>;
					phy-handle = <&gphy0>;
					phy-mode = "rgmii";
				};

				port@1 {
					reg = <1>;
					phy-handle = <&gphy1>;
					phy-mode = "rgmii";
				};

				port@8 {
					reg = <8>;
					label = "cpu";
					ethernet = <&eth0>;
					fixed-link {
						speed = <1000>;
						full-duplex;
					};
				};
			};
		};

		i2c0: i2c@18008000 {
			compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
			reg = <0x18008000 0x100>;
			#address-cells = <1>;
			#size-cells = <0>;
			interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
			clock-frequency = <100000>;
			status = "disabled";
		};

		wdt0: wdt@18009000 {
			compatible = "arm,sp805" , "arm,primecell";
			reg = <0x18009000 0x1000>;
			interrupts = <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>;
			clocks = <&axi81_clk>;
			clock-names = "apb_pclk";
		};

		gpio_ccm: gpio@1800a000 {
			compatible = "brcm,cygnus-ccm-gpio";
			reg = <0x1800a000 0x50>,
			      <0x0301d164 0x20>;
			ngpios = <24>;
			#gpio-cells = <2>;
			gpio-controller;
			interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
			interrupt-controller;
		};

		i2c1: i2c@1800b000 {
			compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
			reg = <0x1800b000 0x100>;
			#address-cells = <1>;
			#size-cells = <0>;
			interrupts = <GIC_SPI 86 IRQ_TYPE_LEVEL_HIGH>;
			clock-frequency = <100000>;
			status = "disabled";
		};

		pcie0: pcie@18012000 {
			compatible = "brcm,iproc-pcie";
			reg = <0x18012000 0x1000>;

			#interrupt-cells = <1>;
			interrupt-map-mask = <0 0 0 0>;
			interrupt-map = <0 0 0 0 &gic GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>;

			linux,pci-domain = <0>;

			bus-range = <0x00 0xff>;

			#address-cells = <3>;
			#size-cells = <2>;
			device_type = "pci";
			ranges = <0x81000000 0 0	  0x28000000 0 0x00010000
				  0x82000000 0 0x20000000 0x20000000 0 0x04000000>;

			phys = <&pcie0_phy>;
			phy-names = "pcie-phy";

			status = "disabled";

			msi-parent = <&msi0>;
			msi0: msi-controller {
				compatible = "brcm,iproc-msi";
				msi-controller;
				interrupt-parent = <&gic>;
				interrupts = <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>,
					     <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>,
					     <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>,
					     <GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH>;
			};
		};

		pcie1: pcie@18013000 {
			compatible = "brcm,iproc-pcie";
			reg = <0x18013000 0x1000>;

			#interrupt-cells = <1>;
			interrupt-map-mask = <0 0 0 0>;
			interrupt-map = <0 0 0 0 &gic GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>;

			linux,pci-domain = <1>;

			bus-range = <0x00 0xff>;

			#address-cells = <3>;
			#size-cells = <2>;
			device_type = "pci";
			ranges = <0x81000000 0 0	  0x48000000 0 0x00010000
				  0x82000000 0 0x40000000 0x40000000 0 0x04000000>;

			phys = <&pcie1_phy>;
			phy-names = "pcie-phy";

			status = "disabled";

			msi-parent = <&msi1>;
			msi1: msi-controller {
				compatible = "brcm,iproc-msi";
				msi-controller;
				interrupt-parent = <&gic>;
				interrupts = <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>,
					     <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>,
					     <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>,
					     <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>;
			};
		};

		dma0: dma@18018000 {
			compatible = "arm,pl330", "arm,primecell";
			reg = <0x18018000 0x1000>;
			interrupts = <GIC_SPI 52 IRQ_TYPE_LEVEL_HIGH>,
				     <GIC_SPI 53 IRQ_TYPE_LEVEL_HIGH>,
				     <GIC_SPI 54 IRQ_TYPE_LEVEL_HIGH>,
				     <GIC_SPI 55 IRQ_TYPE_LEVEL_HIGH>,
				     <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>,
				     <GIC_SPI 57 IRQ_TYPE_LEVEL_HIGH>,
				     <GIC_SPI 58 IRQ_TYPE_LEVEL_HIGH>,
				     <GIC_SPI 59 IRQ_TYPE_LEVEL_HIGH>,
				     <GIC_SPI 67 IRQ_TYPE_LEVEL_HIGH>;
			clocks = <&apb_clk>;
			clock-names = "apb_pclk";
			#dma-cells = <1>;
		};

		uart0: serial@18020000 {
			compatible = "snps,dw-apb-uart";
			reg = <0x18020000 0x100>;
			reg-shift = <2>;
			reg-io-width = <4>;
			interrupts = <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>;
			clocks = <&axi81_clk>;
			clock-frequency = <100000000>;
			status = "disabled";
		};

		uart1: serial@18021000 {
			compatible = "snps,dw-apb-uart";
			reg = <0x18021000 0x100>;
			reg-shift = <2>;
			reg-io-width = <4>;
			interrupts = <GIC_SPI 74 IRQ_TYPE_LEVEL_HIGH>;
			clocks = <&axi81_clk>;
			clock-frequency = <100000000>;
			status = "disabled";
		};

		uart2: serial@18022000 {
			compatible = "snps,dw-apb-uart";
			reg = <0x18022000 0x100>;
			reg-shift = <2>;
			reg-io-width = <4>;
			interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>;
			clocks = <&axi81_clk>;
			clock-frequency = <100000000>;
			status = "disabled";
		};

		uart3: serial@18023000 {
			compatible = "snps,dw-apb-uart";
			reg = <0x18023000 0x100>;
			reg-shift = <2>;
			reg-io-width = <4>;
			interrupts = <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>;
			clocks = <&axi81_clk>;
			clock-frequency = <100000000>;
			status = "disabled";
		};

		spi0: spi@18028000 {
			compatible = "arm,pl022", "arm,primecell";
			reg = <0x18028000 0x1000>;
			#address-cells = <1>;
			#size-cells = <0>;
			interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
			pinctrl-0 = <&spi_0>;
			clocks = <&axi81_clk>;
			clock-names = "apb_pclk";
			status = "disabled";
		};

		spi1: spi@18029000 {
			compatible = "arm,pl022", "arm,primecell";
			reg = <0x18029000 0x1000>;
			#address-cells = <1>;
			#size-cells = <0>;
			interrupts = <GIC_SPI 79 IRQ_TYPE_LEVEL_HIGH>;
			pinctrl-0 = <&spi_1>;
			clocks = <&axi81_clk>;
			clock-names = "apb_pclk";
			status = "disabled";
		};

		spi2: spi@1802a000 {
			compatible = "arm,pl022", "arm,primecell";
			reg = <0x1802a000 0x1000>;
			#address-cells = <1>;
			#size-cells = <0>;
			interrupts = <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>;
			pinctrl-0 = <&spi_2>;
			clocks = <&axi81_clk>;
			clock-names = "apb_pclk";
			status = "disabled";
		};

		sdhci0: sdhci@18041000 {
			compatible = "brcm,sdhci-iproc-cygnus";
			reg = <0x18041000 0x100>;
			interrupts = <GIC_SPI 108 IRQ_TYPE_LEVEL_HIGH>;
			clocks = <&lcpll0 BCM_CYGNUS_LCPLL0_SDIO_CLK>;
			bus-width = <4>;
			sdhci,auto-cmd12;
			status = "disabled";
		};

		eth0: ethernet@18042000 {
			compatible = "brcm,amac";
			reg = <0x18042000 0x1000>,
			      <0x18110000 0x1000>;
			reg-names = "amac_base", "idm_base";
			interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH>;
			status = "disabled";
		};

		sdhci1: sdhci@18043000 {
			compatible = "brcm,sdhci-iproc-cygnus";
			reg = <0x18043000 0x100>;
			interrupts = <GIC_SPI 109 IRQ_TYPE_LEVEL_HIGH>;
			clocks = <&lcpll0 BCM_CYGNUS_LCPLL0_SDIO_CLK>;
			bus-width = <4>;
			sdhci,auto-cmd12;
			status = "disabled";
		};

		nand: nand@18046000 {
			compatible = "brcm,nand-iproc", "brcm,brcmnand-v6.1";
			reg = <0x18046000 0x600>, <0xf8105408 0x600>,
			      <0x18046f00 0x20>;
			reg-names = "nand", "iproc-idm", "iproc-ext";
			interrupts = <GIC_SPI 69 IRQ_TYPE_LEVEL_HIGH>;

			#address-cells = <1>;
			#size-cells = <0>;

			brcm,nand-has-wp;
		};

		ehci0: usb@18048000 {
			compatible = "generic-ehci";
			reg = <0x18048000 0x100>;
			interrupts = <GIC_SPI 72 IRQ_TYPE_LEVEL_HIGH>;
			status = "disabled";
		};

		ohci0: usb@18048800 {
			compatible = "generic-ohci";
			reg = <0x18048800 0x100>;
			interrupts = <GIC_SPI 72 IRQ_TYPE_LEVEL_HIGH>;
			status = "disabled";
		};

		clcd: clcd@180a0000 {
			compatible = "arm,pl111", "arm,primecell";
			reg = <0x180a0000 0x1000>;
			interrupts = <GIC_SPI 155 IRQ_TYPE_LEVEL_HIGH>;
			interrupt-names = "combined";
			clocks = <&axi41_clk>, <&apb_clk>;
			clock-names = "clcdclk", "apb_pclk";
			status = "disabled";
		};

		v3d: v3d@180a2000 {
			compatible = "brcm,cygnus-v3d";
			reg = <0x180a2000 0x1000>;
			clocks = <&mipipll BCM_CYGNUS_MIPIPLL_CH2_V3D>;
			clock-names = "v3d_clk";
			interrupts = <GIC_SPI 182 IRQ_TYPE_LEVEL_HIGH>;
			status = "disabled";
		};

		vc4: gpu {
			compatible = "brcm,cygnus-vc4";
		};

		gpio_asiu: gpio@180a5000 {
			compatible = "brcm,cygnus-asiu-gpio";
			reg = <0x180a5000 0x668>;
			ngpios = <146>;
			#gpio-cells = <2>;
			gpio-controller;

			interrupt-controller;
			interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
			gpio-ranges = <&pinctrl 0 42 1>,
					<&pinctrl 1 44 3>,
					<&pinctrl 4 48 1>,
					<&pinctrl 5 50 3>,
					<&pinctrl 8 126 1>,
					<&pinctrl 9 155 1>,
					<&pinctrl 10 152 1>,
					<&pinctrl 11 154 1>,
					<&pinctrl 12 153 1>,
					<&pinctrl 13 127 3>,
					<&pinctrl 16 140 1>,
					<&pinctrl 17 145 7>,
					<&pinctrl 24 130 10>,
					<&pinctrl 34 141 4>,
					<&pinctrl 38 54 1>,
					<&pinctrl 39 56 3>,
					<&pinctrl 42 60 3>,
					<&pinctrl 45 64 3>,
					<&pinctrl 48 68 2>,
					<&pinctrl 50 84 6>,
					<&pinctrl 56 94 6>,
					<&pinctrl 62 72 1>,
					<&pinctrl 63 70 1>,
					<&pinctrl 64 80 1>,
					<&pinctrl 65 74 3>,
					<&pinctrl 68 78 1>,
					<&pinctrl 69 82 1>,
					<&pinctrl 70 156 17>,
					<&pinctrl 87 104 12>,
					<&pinctrl 99 102 2>,
					<&pinctrl 101 90 4>,
					<&pinctrl 105 116 6>,
					<&pinctrl 111 100 2>,
					<&pinctrl 113 122 4>,
					<&pinctrl 123 11 1>,
					<&pinctrl 124 38 4>,
					<&pinctrl 128 43 1>,
					<&pinctrl 129 47 1>,
					<&pinctrl 130 49 1>,
					<&pinctrl 131 53 1>,
					<&pinctrl 132 55 1>,
					<&pinctrl 133 59 1>,
					<&pinctrl 134 63 1>,
					<&pinctrl 135 67 1>,
					<&pinctrl 136 71 1>,
					<&pinctrl 137 73 1>,
					<&pinctrl 138 77 1>,
					<&pinctrl 139 79 1>,
					<&pinctrl 140 81 1>,
					<&pinctrl 141 83 1>,
					<&pinctrl 142 10 1>;
		};

		ts_adc_syscon: ts_adc_syscon@180a6000 {
			compatible = "brcm,iproc-ts-adc-syscon", "syscon";
			reg = <0x180a6000 0xc30>;
		};

		touchscreen: touchscreen@180a6000 {
			compatible = "brcm,iproc-touchscreen";
			#address-cells = <1>;
			#size-cells = <1>;
			ts_syscon = <&ts_adc_syscon>;
			clocks = <&asiu_clks BCM_CYGNUS_ASIU_ADC_CLK>;
			clock-names = "tsc_clk";
			interrupts = <GIC_SPI 164 IRQ_TYPE_LEVEL_HIGH>;
			status = "disabled";
		};

		adc: adc@180a6000 {
			compatible = "brcm,iproc-static-adc";
			#io-channel-cells = <1>;
			io-channel-ranges;
			adc-syscon = <&ts_adc_syscon>;
			clocks = <&asiu_clks BCM_CYGNUS_ASIU_ADC_CLK>;
			clock-names = "tsc_clk";
			interrupts = <GIC_SPI 164 IRQ_TYPE_LEVEL_HIGH>;
			status = "disabled";
		};

		pwm: pwm@180aa500 {
			compatible = "brcm,kona-pwm";
			reg = <0x180aa500 0xc4>;
			#pwm-cells = <3>;
			clocks = <&asiu_clks BCM_CYGNUS_ASIU_PWM_CLK>;
			status = "disabled";
		};

		keypad: keypad@180ac000 {
			compatible = "brcm,bcm-keypad";
			reg = <0x180ac000 0x14c>;
			interrupts = <GIC_SPI 165 IRQ_TYPE_LEVEL_HIGH>;
			clocks = <&asiu_clks BCM_CYGNUS_ASIU_KEYPAD_CLK>;
			clock-names = "peri_clk";
			clock-frequency = <31250>;
			pull-up-enabled;
			col-debounce-filter-period = <0>;
			status-debounce-filter-period = <0>;
			row-output-enabled;
			status = "disabled";
		};
	};
};
3'>1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903
// SPDX-License-Identifier: GPL-2.0
/*
 * Kprobes-based tracing events
 *
 * Created by Masami Hiramatsu <mhiramat@redhat.com>
 *
 */
#define pr_fmt(fmt)	"trace_kprobe: " fmt

#include <linux/security.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/rculist.h>
#include <linux/error-injection.h>

#include <asm/setup.h>  /* for COMMAND_LINE_SIZE */

#include "trace_dynevent.h"
#include "trace_kprobe_selftest.h"
#include "trace_probe.h"
#include "trace_probe_tmpl.h"

#define KPROBE_EVENT_SYSTEM "kprobes"
#define KRETPROBE_MAXACTIVE_MAX 4096
#define MAX_KPROBE_CMDLINE_SIZE 1024

/* Kprobe early definition from command line */
static char kprobe_boot_events_buf[COMMAND_LINE_SIZE] __initdata;
static bool kprobe_boot_events_enabled __initdata;

static int __init set_kprobe_boot_events(char *str)
{
	strlcpy(kprobe_boot_events_buf, str, COMMAND_LINE_SIZE);
	return 0;
}
__setup("kprobe_event=", set_kprobe_boot_events);

static int trace_kprobe_create(int argc, const char **argv);
static int trace_kprobe_show(struct seq_file *m, struct dyn_event *ev);
static int trace_kprobe_release(struct dyn_event *ev);
static bool trace_kprobe_is_busy(struct dyn_event *ev);
static bool trace_kprobe_match(const char *system, const char *event,
			int argc, const char **argv, struct dyn_event *ev);

static struct dyn_event_operations trace_kprobe_ops = {
	.create = trace_kprobe_create,
	.show = trace_kprobe_show,
	.is_busy = trace_kprobe_is_busy,
	.free = trace_kprobe_release,
	.match = trace_kprobe_match,
};

/*
 * Kprobe event core functions
 */
struct trace_kprobe {
	struct dyn_event	devent;
	struct kretprobe	rp;	/* Use rp.kp for kprobe use */
	unsigned long __percpu *nhit;
	const char		*symbol;	/* symbol name */
	struct trace_probe	tp;
};

static bool is_trace_kprobe(struct dyn_event *ev)
{
	return ev->ops == &trace_kprobe_ops;
}

static struct trace_kprobe *to_trace_kprobe(struct dyn_event *ev)
{
	return container_of(ev, struct trace_kprobe, devent);
}

/**
 * for_each_trace_kprobe - iterate over the trace_kprobe list
 * @pos:	the struct trace_kprobe * for each entry
 * @dpos:	the struct dyn_event * to use as a loop cursor
 */
#define for_each_trace_kprobe(pos, dpos)	\
	for_each_dyn_event(dpos)		\
		if (is_trace_kprobe(dpos) && (pos = to_trace_kprobe(dpos)))

#define SIZEOF_TRACE_KPROBE(n)				\
	(offsetof(struct trace_kprobe, tp.args) +	\
	(sizeof(struct probe_arg) * (n)))

static nokprobe_inline bool trace_kprobe_is_return(struct trace_kprobe *tk)
{
	return tk->rp.handler != NULL;
}

static nokprobe_inline const char *trace_kprobe_symbol(struct trace_kprobe *tk)
{
	return tk->symbol ? tk->symbol : "unknown";
}

static nokprobe_inline unsigned long trace_kprobe_offset(struct trace_kprobe *tk)
{
	return tk->rp.kp.offset;
}

static nokprobe_inline bool trace_kprobe_has_gone(struct trace_kprobe *tk)
{
	return !!(kprobe_gone(&tk->rp.kp));
}

static nokprobe_inline bool trace_kprobe_within_module(struct trace_kprobe *tk,
						 struct module *mod)
{
	int len = strlen(mod->name);
	const char *name = trace_kprobe_symbol(tk);
	return strncmp(mod->name, name, len) == 0 && name[len] == ':';
}

static nokprobe_inline bool trace_kprobe_module_exist(struct trace_kprobe *tk)
{
	char *p;
	bool ret;

	if (!tk->symbol)
		return false;
	p = strchr(tk->symbol, ':');
	if (!p)
		return true;
	*p = '\0';
	mutex_lock(&module_mutex);
	ret = !!find_module(tk->symbol);
	mutex_unlock(&module_mutex);
	*p = ':';

	return ret;
}

static bool trace_kprobe_is_busy(struct dyn_event *ev)
{
	struct trace_kprobe *tk = to_trace_kprobe(ev);

	return trace_probe_is_enabled(&tk->tp);
}

static bool trace_kprobe_match_command_head(struct trace_kprobe *tk,
					    int argc, const char **argv)
{
	char buf[MAX_ARGSTR_LEN + 1];

	if (!argc)
		return true;

	if (!tk->symbol)
		snprintf(buf, sizeof(buf), "0x%p", tk->rp.kp.addr);
	else if (tk->rp.kp.offset)
		snprintf(buf, sizeof(buf), "%s+%u",
			 trace_kprobe_symbol(tk), tk->rp.kp.offset);
	else
		snprintf(buf, sizeof(buf), "%s", trace_kprobe_symbol(tk));
	if (strcmp(buf, argv[0]))
		return false;
	argc--; argv++;

	return trace_probe_match_command_args(&tk->tp, argc, argv);
}

static bool trace_kprobe_match(const char *system, const char *event,
			int argc, const char **argv, struct dyn_event *ev)
{
	struct trace_kprobe *tk = to_trace_kprobe(ev);

	return strcmp(trace_probe_name(&tk->tp), event) == 0 &&
	    (!system || strcmp(trace_probe_group_name(&tk->tp), system) == 0) &&
	    trace_kprobe_match_command_head(tk, argc, argv);
}

static nokprobe_inline unsigned long trace_kprobe_nhit(struct trace_kprobe *tk)
{
	unsigned long nhit = 0;
	int cpu;

	for_each_possible_cpu(cpu)
		nhit += *per_cpu_ptr(tk->nhit, cpu);

	return nhit;
}

static nokprobe_inline bool trace_kprobe_is_registered(struct trace_kprobe *tk)
{
	return !(list_empty(&tk->rp.kp.list) &&
		 hlist_unhashed(&tk->rp.kp.hlist));
}

/* Return 0 if it fails to find the symbol address */
static nokprobe_inline
unsigned long trace_kprobe_address(struct trace_kprobe *tk)
{
	unsigned long addr;

	if (tk->symbol) {
		addr = (unsigned long)
			kallsyms_lookup_name(trace_kprobe_symbol(tk));
		if (addr)
			addr += tk->rp.kp.offset;
	} else {
		addr = (unsigned long)tk->rp.kp.addr;
	}
	return addr;
}

static nokprobe_inline struct trace_kprobe *
trace_kprobe_primary_from_call(struct trace_event_call *call)
{
	struct trace_probe *tp;

	tp = trace_probe_primary_from_call(call);
	if (WARN_ON_ONCE(!tp))
		return NULL;

	return container_of(tp, struct trace_kprobe, tp);
}

bool trace_kprobe_on_func_entry(struct trace_event_call *call)
{
	struct trace_kprobe *tk = trace_kprobe_primary_from_call(call);

	return tk ? (kprobe_on_func_entry(tk->rp.kp.addr,
			tk->rp.kp.addr ? NULL : tk->rp.kp.symbol_name,
			tk->rp.kp.addr ? 0 : tk->rp.kp.offset) == 0) : false;
}

bool trace_kprobe_error_injectable(struct trace_event_call *call)
{
	struct trace_kprobe *tk = trace_kprobe_primary_from_call(call);

	return tk ? within_error_injection_list(trace_kprobe_address(tk)) :
	       false;
}

static int register_kprobe_event(struct trace_kprobe *tk);
static int unregister_kprobe_event(struct trace_kprobe *tk);

static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs);
static int kretprobe_dispatcher(struct kretprobe_instance *ri,
				struct pt_regs *regs);

static void free_trace_kprobe(struct trace_kprobe *tk)
{
	if (tk) {
		trace_probe_cleanup(&tk->tp);
		kfree(tk->symbol);
		free_percpu(tk->nhit);
		kfree(tk);
	}
}

/*
 * Allocate new trace_probe and initialize it (including kprobes).
 */
static struct trace_kprobe *alloc_trace_kprobe(const char *group,
					     const char *event,
					     void *addr,
					     const char *symbol,
					     unsigned long offs,
					     int maxactive,
					     int nargs, bool is_return)
{
	struct trace_kprobe *tk;
	int ret = -ENOMEM;

	tk = kzalloc(SIZEOF_TRACE_KPROBE(nargs), GFP_KERNEL);
	if (!tk)
		return ERR_PTR(ret);

	tk->nhit = alloc_percpu(unsigned long);
	if (!tk->nhit)
		goto error;

	if (symbol) {
		tk->symbol = kstrdup(symbol, GFP_KERNEL);
		if (!tk->symbol)
			goto error;
		tk->rp.kp.symbol_name = tk->symbol;
		tk->rp.kp.offset = offs;
	} else
		tk->rp.kp.addr = addr;

	if (is_return)
		tk->rp.handler = kretprobe_dispatcher;
	else
		tk->rp.kp.pre_handler = kprobe_dispatcher;

	tk->rp.maxactive = maxactive;
	INIT_HLIST_NODE(&tk->rp.kp.hlist);
	INIT_LIST_HEAD(&tk->rp.kp.list);

	ret = trace_probe_init(&tk->tp, event, group, false);
	if (ret < 0)
		goto error;

	dyn_event_init(&tk->devent, &trace_kprobe_ops);
	return tk;
error:
	free_trace_kprobe(tk);
	return ERR_PTR(ret);
}

static struct trace_kprobe *find_trace_kprobe(const char *event,
					      const char *group)
{
	struct dyn_event *pos;
	struct trace_kprobe *tk;

	for_each_trace_kprobe(tk, pos)
		if (strcmp(trace_probe_name(&tk->tp), event) == 0 &&
		    strcmp(trace_probe_group_name(&tk->tp), group) == 0)
			return tk;
	return NULL;
}

static inline int __enable_trace_kprobe(struct trace_kprobe *tk)
{
	int ret = 0;

	if (trace_kprobe_is_registered(tk) && !trace_kprobe_has_gone(tk)) {
		if (trace_kprobe_is_return(tk))
			ret = enable_kretprobe(&tk->rp);
		else
			ret = enable_kprobe(&tk->rp.kp);
	}

	return ret;
}

static void __disable_trace_kprobe(struct trace_probe *tp)
{
	struct trace_probe *pos;
	struct trace_kprobe *tk;

	list_for_each_entry(pos, trace_probe_probe_list(tp), list) {
		tk = container_of(pos, struct trace_kprobe, tp);
		if (!trace_kprobe_is_registered(tk))
			continue;
		if (trace_kprobe_is_return(tk))
			disable_kretprobe(&tk->rp);
		else
			disable_kprobe(&tk->rp.kp);
	}
}

/*
 * Enable trace_probe
 * if the file is NULL, enable "perf" handler, or enable "trace" handler.
 */
static int enable_trace_kprobe(struct trace_event_call *call,
				struct trace_event_file *file)
{
	struct trace_probe *pos, *tp;
	struct trace_kprobe *tk;
	bool enabled;
	int ret = 0;

	tp = trace_probe_primary_from_call(call);
	if (WARN_ON_ONCE(!tp))
		return -ENODEV;
	enabled = trace_probe_is_enabled(tp);

	/* This also changes "enabled" state */
	if (file) {
		ret = trace_probe_add_file(tp, file);
		if (ret)
			return ret;
	} else
		trace_probe_set_flag(tp, TP_FLAG_PROFILE);

	if (enabled)
		return 0;

	list_for_each_entry(pos, trace_probe_probe_list(tp), list) {
		tk = container_of(pos, struct trace_kprobe, tp);
		if (trace_kprobe_has_gone(tk))
			continue;
		ret = __enable_trace_kprobe(tk);
		if (ret)
			break;
		enabled = true;
	}

	if (ret) {
		/* Failed to enable one of them. Roll back all */
		if (enabled)
			__disable_trace_kprobe(tp);
		if (file)
			trace_probe_remove_file(tp, file);
		else
			trace_probe_clear_flag(tp, TP_FLAG_PROFILE);
	}

	return ret;
}

/*
 * Disable trace_probe
 * if the file is NULL, disable "perf" handler, or disable "trace" handler.
 */
static int disable_trace_kprobe(struct trace_event_call *call,
				struct trace_event_file *file)
{
	struct trace_probe *tp;

	tp = trace_probe_primary_from_call(call);
	if (WARN_ON_ONCE(!tp))
		return -ENODEV;

	if (file) {
		if (!trace_probe_get_file_link(tp, file))
			return -ENOENT;
		if (!trace_probe_has_single_file(tp))
			goto out;
		trace_probe_clear_flag(tp, TP_FLAG_TRACE);
	} else
		trace_probe_clear_flag(tp, TP_FLAG_PROFILE);

	if (!trace_probe_is_enabled(tp))
		__disable_trace_kprobe(tp);

 out:
	if (file)
		/*
		 * Synchronization is done in below function. For perf event,
		 * file == NULL and perf_trace_event_unreg() calls
		 * tracepoint_synchronize_unregister() to ensure synchronize
		 * event. We don't need to care about it.
		 */
		trace_probe_remove_file(tp, file);

	return 1;
}

#if defined(CONFIG_DYNAMIC_FTRACE) && \
	!defined(CONFIG_KPROBE_EVENTS_ON_NOTRACE)
static bool __within_notrace_func(unsigned long addr)
{
	unsigned long offset, size;

	if (!addr || !kallsyms_lookup_size_offset(addr, &size, &offset))
		return false;

	/* Get the entry address of the target function */
	addr -= offset;

	/*
	 * Since ftrace_location_range() does inclusive range check, we need
	 * to subtract 1 byte from the end address.
	 */
	return !ftrace_location_range(addr, addr + size - 1);
}

static bool within_notrace_func(struct trace_kprobe *tk)
{
	unsigned long addr = trace_kprobe_address(tk);
	char symname[KSYM_NAME_LEN], *p;

	if (!__within_notrace_func(addr))
		return false;

	/* Check if the address is on a suffixed-symbol */
	if (!lookup_symbol_name(addr, symname)) {
		p = strchr(symname, '.');
		if (!p)
			return true;
		*p = '\0';
		addr = (unsigned long)kprobe_lookup_name(symname, 0);
		if (addr)
			return __within_notrace_func(addr);
	}

	return true;
}
#else
#define within_notrace_func(tk)	(false)
#endif

/* Internal register function - just handle k*probes and flags */
static int __register_trace_kprobe(struct trace_kprobe *tk)
{
	int i, ret;

	ret = security_locked_down(LOCKDOWN_KPROBES);
	if (ret)
		return ret;

	if (trace_kprobe_is_registered(tk))
		return -EINVAL;

	if (within_notrace_func(tk)) {
		pr_warn("Could not probe notrace function %s\n",
			trace_kprobe_symbol(tk));
		return -EINVAL;
	}

	for (i = 0; i < tk->tp.nr_args; i++) {
		ret = traceprobe_update_arg(&tk->tp.args[i]);
		if (ret)
			return ret;
	}

	/* Set/clear disabled flag according to tp->flag */
	if (trace_probe_is_enabled(&tk->tp))
		tk->rp.kp.flags &= ~KPROBE_FLAG_DISABLED;
	else
		tk->rp.kp.flags |= KPROBE_FLAG_DISABLED;

	if (trace_kprobe_is_return(tk))
		ret = register_kretprobe(&tk->rp);
	else
		ret = register_kprobe(&tk->rp.kp);

	return ret;
}

/* Internal unregister function - just handle k*probes and flags */
static void __unregister_trace_kprobe(struct trace_kprobe *tk)
{
	if (trace_kprobe_is_registered(tk)) {
		if (trace_kprobe_is_return(tk))
			unregister_kretprobe(&tk->rp);
		else
			unregister_kprobe(&tk->rp.kp);
		/* Cleanup kprobe for reuse and mark it unregistered */
		INIT_HLIST_NODE(&tk->rp.kp.hlist);
		INIT_LIST_HEAD(&tk->rp.kp.list);
		if (tk->rp.kp.symbol_name)
			tk->rp.kp.addr = NULL;
	}
}

/* Unregister a trace_probe and probe_event */
static int unregister_trace_kprobe(struct trace_kprobe *tk)
{
	/* If other probes are on the event, just unregister kprobe */
	if (trace_probe_has_sibling(&tk->tp))
		goto unreg;

	/* Enabled event can not be unregistered */
	if (trace_probe_is_enabled(&tk->tp))
		return -EBUSY;

	/* Will fail if probe is being used by ftrace or perf */
	if (unregister_kprobe_event(tk))
		return -EBUSY;

unreg:
	__unregister_trace_kprobe(tk);
	dyn_event_remove(&tk->devent);
	trace_probe_unlink(&tk->tp);

	return 0;
}

static bool trace_kprobe_has_same_kprobe(struct trace_kprobe *orig,
					 struct trace_kprobe *comp)
{
	struct trace_probe_event *tpe = orig->tp.event;
	struct trace_probe *pos;
	int i;

	list_for_each_entry(pos, &tpe->probes, list) {
		orig = container_of(pos, struct trace_kprobe, tp);
		if (strcmp(trace_kprobe_symbol(orig),
			   trace_kprobe_symbol(comp)) ||
		    trace_kprobe_offset(orig) != trace_kprobe_offset(comp))
			continue;

		/*
		 * trace_probe_compare_arg_type() ensured that nr_args and
		 * each argument name and type are same. Let's compare comm.
		 */
		for (i = 0; i < orig->tp.nr_args; i++) {
			if (strcmp(orig->tp.args[i].comm,
				   comp->tp.args[i].comm))
				break;
		}

		if (i == orig->tp.nr_args)
			return true;
	}

	return false;
}

static int append_trace_kprobe(struct trace_kprobe *tk, struct trace_kprobe *to)
{
	int ret;

	ret = trace_probe_compare_arg_type(&tk->tp, &to->tp);
	if (ret) {
		/* Note that argument starts index = 2 */
		trace_probe_log_set_index(ret + 1);
		trace_probe_log_err(0, DIFF_ARG_TYPE);
		return -EEXIST;
	}
	if (trace_kprobe_has_same_kprobe(to, tk)) {
		trace_probe_log_set_index(0);
		trace_probe_log_err(0, SAME_PROBE);
		return -EEXIST;
	}

	/* Append to existing event */
	ret = trace_probe_append(&tk->tp, &to->tp);
	if (ret)
		return ret;

	/* Register k*probe */
	ret = __register_trace_kprobe(tk);
	if (ret == -ENOENT && !trace_kprobe_module_exist(tk)) {
		pr_warn("This probe might be able to register after target module is loaded. Continue.\n");
		ret = 0;
	}

	if (ret)
		trace_probe_unlink(&tk->tp);
	else
		dyn_event_add(&tk->devent);

	return ret;
}

/* Register a trace_probe and probe_event */
static int register_trace_kprobe(struct trace_kprobe *tk)
{
	struct trace_kprobe *old_tk;
	int ret;

	mutex_lock(&event_mutex);

	old_tk = find_trace_kprobe(trace_probe_name(&tk->tp),
				   trace_probe_group_name(&tk->tp));
	if (old_tk) {
		if (trace_kprobe_is_return(tk) != trace_kprobe_is_return(old_tk)) {
			trace_probe_log_set_index(0);
			trace_probe_log_err(0, DIFF_PROBE_TYPE);
			ret = -EEXIST;
		} else {
			ret = append_trace_kprobe(tk, old_tk);
		}
		goto end;
	}

	/* Register new event */
	ret = register_kprobe_event(tk);
	if (ret) {
		if (ret == -EEXIST) {
			trace_probe_log_set_index(0);
			trace_probe_log_err(0, EVENT_EXIST);
		} else
			pr_warn("Failed to register probe event(%d)\n", ret);
		goto end;
	}

	/* Register k*probe */
	ret = __register_trace_kprobe(tk);
	if (ret == -ENOENT && !trace_kprobe_module_exist(tk)) {
		pr_warn("This probe might be able to register after target module is loaded. Continue.\n");
		ret = 0;
	}

	if (ret < 0)
		unregister_kprobe_event(tk);
	else
		dyn_event_add(&tk->devent);

end:
	mutex_unlock(&event_mutex);
	return ret;
}

/* Module notifier call back, checking event on the module */
static int trace_kprobe_module_callback(struct notifier_block *nb,
				       unsigned long val, void *data)
{
	struct module *mod = data;
	struct dyn_event *pos;
	struct trace_kprobe *tk;
	int ret;

	if (val != MODULE_STATE_COMING)
		return NOTIFY_DONE;

	/* Update probes on coming module */
	mutex_lock(&event_mutex);
	for_each_trace_kprobe(tk, pos) {
		if (trace_kprobe_within_module(tk, mod)) {
			/* Don't need to check busy - this should have gone. */
			__unregister_trace_kprobe(tk);
			ret = __register_trace_kprobe(tk);
			if (ret)
				pr_warn("Failed to re-register probe %s on %s: %d\n",
					trace_probe_name(&tk->tp),
					mod->name, ret);
		}
	}
	mutex_unlock(&event_mutex);

	return NOTIFY_DONE;
}

static struct notifier_block trace_kprobe_module_nb = {
	.notifier_call = trace_kprobe_module_callback,
	.priority = 1	/* Invoked after kprobe module callback */
};

/* Convert certain expected symbols into '_' when generating event names */
static inline void sanitize_event_name(char *name)
{
	while (*name++ != '\0')
		if (*name == ':' || *name == '.')
			*name = '_';
}

static int trace_kprobe_create(int argc, const char *argv[])
{
	/*
	 * Argument syntax:
	 *  - Add kprobe:
	 *      p[:[GRP/]EVENT] [MOD:]KSYM[+OFFS]|KADDR [FETCHARGS]
	 *  - Add kretprobe:
	 *      r[MAXACTIVE][:[GRP/]EVENT] [MOD:]KSYM[+0] [FETCHARGS]
	 * Fetch args:
	 *  $retval	: fetch return value
	 *  $stack	: fetch stack address
	 *  $stackN	: fetch Nth of stack (N:0-)
	 *  $comm       : fetch current task comm
	 *  @ADDR	: fetch memory at ADDR (ADDR should be in kernel)
	 *  @SYM[+|-offs] : fetch memory at SYM +|- offs (SYM is a data symbol)
	 *  %REG	: fetch register REG
	 * Dereferencing memory fetch:
	 *  +|-offs(ARG) : fetch memory at ARG +|- offs address.
	 * Alias name of args:
	 *  NAME=FETCHARG : set NAME as alias of FETCHARG.
	 * Type of args:
	 *  FETCHARG:TYPE : use TYPE instead of unsigned long.
	 */
	struct trace_kprobe *tk = NULL;
	int i, len, ret = 0;
	bool is_return = false;
	char *symbol = NULL, *tmp = NULL;
	const char *event = NULL, *group = KPROBE_EVENT_SYSTEM;
	int maxactive = 0;
	long offset = 0;
	void *addr = NULL;
	char buf[MAX_EVENT_NAME_LEN];
	unsigned int flags = TPARG_FL_KERNEL;

	switch (argv[0][0]) {
	case 'r':
		is_return = true;
		flags |= TPARG_FL_RETURN;
		break;
	case 'p':
		break;
	default:
		return -ECANCELED;
	}
	if (argc < 2)
		return -ECANCELED;

	trace_probe_log_init("trace_kprobe", argc, argv);

	event = strchr(&argv[0][1], ':');
	if (event)
		event++;

	if (isdigit(argv[0][1])) {
		if (!is_return) {
			trace_probe_log_err(1, MAXACT_NO_KPROBE);
			goto parse_error;
		}
		if (event)
			len = event - &argv[0][1] - 1;
		else
			len = strlen(&argv[0][1]);
		if (len > MAX_EVENT_NAME_LEN - 1) {
			trace_probe_log_err(1, BAD_MAXACT);
			goto parse_error;
		}
		memcpy(buf, &argv[0][1], len);
		buf[len] = '\0';
		ret = kstrtouint(buf, 0, &maxactive);
		if (ret || !maxactive) {
			trace_probe_log_err(1, BAD_MAXACT);
			goto parse_error;
		}
		/* kretprobes instances are iterated over via a list. The
		 * maximum should stay reasonable.
		 */
		if (maxactive > KRETPROBE_MAXACTIVE_MAX) {
			trace_probe_log_err(1, MAXACT_TOO_BIG);
			goto parse_error;
		}
	}

	/* try to parse an address. if that fails, try to read the
	 * input as a symbol. */
	if (kstrtoul(argv[1], 0, (unsigned long *)&addr)) {
		trace_probe_log_set_index(1);
		/* Check whether uprobe event specified */
		if (strchr(argv[1], '/') && strchr(argv[1], ':')) {
			ret = -ECANCELED;
			goto error;
		}
		/* a symbol specified */
		symbol = kstrdup(argv[1], GFP_KERNEL);
		if (!symbol)
			return -ENOMEM;
		/* TODO: support .init module functions */
		ret = traceprobe_split_symbol_offset(symbol, &offset);
		if (ret || offset < 0 || offset > UINT_MAX) {
			trace_probe_log_err(0, BAD_PROBE_ADDR);
			goto parse_error;
		}
		ret = kprobe_on_func_entry(NULL, symbol, offset);
		if (ret == 0)
			flags |= TPARG_FL_FENTRY;
		/* Defer the ENOENT case until register kprobe */
		if (ret == -EINVAL && is_return) {
			trace_probe_log_err(0, BAD_RETPROBE);
			goto parse_error;
		}
	}

	trace_probe_log_set_index(0);
	if (event) {
		ret = traceprobe_parse_event_name(&event, &group, buf,
						  event - argv[0]);
		if (ret)
			goto parse_error;
	} else {
		/* Make a new event name */
		if (symbol)
			snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_%ld",
				 is_return ? 'r' : 'p', symbol, offset);
		else
			snprintf(buf, MAX_EVENT_NAME_LEN, "%c_0x%p",
				 is_return ? 'r' : 'p', addr);
		sanitize_event_name(buf);
		event = buf;
	}

	/* setup a probe */
	tk = alloc_trace_kprobe(group, event, addr, symbol, offset, maxactive,
			       argc - 2, is_return);
	if (IS_ERR(tk)) {
		ret = PTR_ERR(tk);
		/* This must return -ENOMEM, else there is a bug */
		WARN_ON_ONCE(ret != -ENOMEM);
		goto out;	/* We know tk is not allocated */
	}
	argc -= 2; argv += 2;

	/* parse arguments */
	for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
		tmp = kstrdup(argv[i], GFP_KERNEL);
		if (!tmp) {
			ret = -ENOMEM;
			goto error;
		}

		trace_probe_log_set_index(i + 2);
		ret = traceprobe_parse_probe_arg(&tk->tp, i, tmp, flags);
		kfree(tmp);
		if (ret)
			goto error;	/* This can be -ENOMEM */
	}

	ret = traceprobe_set_print_fmt(&tk->tp, is_return);
	if (ret < 0)
		goto error;

	ret = register_trace_kprobe(tk);
	if (ret) {
		trace_probe_log_set_index(1);
		if (ret == -EILSEQ)
			trace_probe_log_err(0, BAD_INSN_BNDRY);
		else if (ret == -ENOENT)
			trace_probe_log_err(0, BAD_PROBE_ADDR);
		else if (ret != -ENOMEM && ret != -EEXIST)
			trace_probe_log_err(0, FAIL_REG_PROBE);
		goto error;
	}

out:
	trace_probe_log_clear();
	kfree(symbol);
	return ret;

parse_error:
	ret = -EINVAL;
error:
	free_trace_kprobe(tk);
	goto out;
}

static int create_or_delete_trace_kprobe(int argc, char **argv)
{
	int ret;

	if (argv[0][0] == '-')
		return dyn_event_release(argc, argv, &trace_kprobe_ops);

	ret = trace_kprobe_create(argc, (const char **)argv);
	return ret == -ECANCELED ? -EINVAL : ret;
}

static int trace_kprobe_release(struct dyn_event *ev)
{
	struct trace_kprobe *tk = to_trace_kprobe(ev);
	int ret = unregister_trace_kprobe(tk);

	if (!ret)
		free_trace_kprobe(tk);
	return ret;
}

static int trace_kprobe_show(struct seq_file *m, struct dyn_event *ev)
{
	struct trace_kprobe *tk = to_trace_kprobe(ev);
	int i;

	seq_putc(m, trace_kprobe_is_return(tk) ? 'r' : 'p');
	if (trace_kprobe_is_return(tk) && tk->rp.maxactive)
		seq_printf(m, "%d", tk->rp.maxactive);
	seq_printf(m, ":%s/%s", trace_probe_group_name(&tk->tp),
				trace_probe_name(&tk->tp));

	if (!tk->symbol)
		seq_printf(m, " 0x%p", tk->rp.kp.addr);
	else if (tk->rp.kp.offset)
		seq_printf(m, " %s+%u", trace_kprobe_symbol(tk),
			   tk->rp.kp.offset);
	else
		seq_printf(m, " %s", trace_kprobe_symbol(tk));

	for (i = 0; i < tk->tp.nr_args; i++)
		seq_printf(m, " %s=%s", tk->tp.args[i].name, tk->tp.args[i].comm);
	seq_putc(m, '\n');

	return 0;
}

static int probes_seq_show(struct seq_file *m, void *v)
{
	struct dyn_event *ev = v;

	if (!is_trace_kprobe(ev))
		return 0;

	return trace_kprobe_show(m, ev);
}

static const struct seq_operations probes_seq_op = {
	.start  = dyn_event_seq_start,
	.next   = dyn_event_seq_next,
	.stop   = dyn_event_seq_stop,
	.show   = probes_seq_show
};

static int probes_open(struct inode *inode, struct file *file)
{
	int ret;

	ret = security_locked_down(LOCKDOWN_TRACEFS);
	if (ret)
		return ret;

	if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) {
		ret = dyn_events_release_all(&trace_kprobe_ops);
		if (ret < 0)
			return ret;
	}

	return seq_open(file, &probes_seq_op);
}

static ssize_t probes_write(struct file *file, const char __user *buffer,
			    size_t count, loff_t *ppos)
{
	return trace_parse_run_command(file, buffer, count, ppos,
				       create_or_delete_trace_kprobe);
}

static const struct file_operations kprobe_events_ops = {
	.owner          = THIS_MODULE,
	.open           = probes_open,
	.read           = seq_read,
	.llseek         = seq_lseek,
	.release        = seq_release,
	.write		= probes_write,
};

/* Probes profiling interfaces */
static int probes_profile_seq_show(struct seq_file *m, void *v)
{
	struct dyn_event *ev = v;
	struct trace_kprobe *tk;
	unsigned long nmissed;

	if (!is_trace_kprobe(ev))
		return 0;

	tk = to_trace_kprobe(ev);
	nmissed = trace_kprobe_is_return(tk) ?
		tk->rp.kp.nmissed + tk->rp.nmissed : tk->rp.kp.nmissed;
	seq_printf(m, "  %-44s %15lu %15lu\n",
		   trace_probe_name(&tk->tp),
		   trace_kprobe_nhit(tk),
		   nmissed);

	return 0;
}

static const struct seq_operations profile_seq_op = {
	.start  = dyn_event_seq_start,
	.next   = dyn_event_seq_next,
	.stop   = dyn_event_seq_stop,
	.show   = probes_profile_seq_show
};

static int profile_open(struct inode *inode, struct file *file)
{
	int ret;

	ret = security_locked_down(LOCKDOWN_TRACEFS);
	if (ret)
		return ret;

	return seq_open(file, &profile_seq_op);
}

static const struct file_operations kprobe_profile_ops = {
	.owner          = THIS_MODULE,
	.open           = profile_open,
	.read           = seq_read,
	.llseek         = seq_lseek,
	.release        = seq_release,
};

/* Kprobe specific fetch functions */

/* Return the length of string -- including null terminal byte */
static nokprobe_inline int
fetch_store_strlen(unsigned long addr)
{
	int ret, len = 0;
	u8 c;

	do {
		ret = probe_kernel_read(&c, (u8 *)addr + len, 1);
		len++;
	} while (c && ret == 0 && len < MAX_STRING_SIZE);

	return (ret < 0) ? ret : len;
}

/* Return the length of string -- including null terminal byte */
static nokprobe_inline int
fetch_store_strlen_user(unsigned long addr)
{
	const void __user *uaddr =  (__force const void __user *)addr;

	return strnlen_unsafe_user(uaddr, MAX_STRING_SIZE);
}

/*
 * Fetch a null-terminated string. Caller MUST set *(u32 *)buf with max
 * length and relative data location.
 */
static nokprobe_inline int
fetch_store_string(unsigned long addr, void *dest, void *base)
{
	int maxlen = get_loc_len(*(u32 *)dest);
	void *__dest;
	long ret;

	if (unlikely(!maxlen))
		return -ENOMEM;

	__dest = get_loc_data(dest, base);

	/*
	 * Try to get string again, since the string can be changed while
	 * probing.
	 */
	ret = strncpy_from_unsafe(__dest, (void *)addr, maxlen);
	if (ret >= 0)
		*(u32 *)dest = make_data_loc(ret, __dest - base);

	return ret;
}

/*
 * Fetch a null-terminated string from user. Caller MUST set *(u32 *)buf
 * with max length and relative data location.
 */
static nokprobe_inline int
fetch_store_string_user(unsigned long addr, void *dest, void *base)
{
	const void __user *uaddr =  (__force const void __user *)addr;
	int maxlen = get_loc_len(*(u32 *)dest);
	void *__dest;
	long ret;

	if (unlikely(!maxlen))
		return -ENOMEM;

	__dest = get_loc_data(dest, base);

	ret = strncpy_from_unsafe_user(__dest, uaddr, maxlen);
	if (ret >= 0)
		*(u32 *)dest = make_data_loc(ret, __dest - base);

	return ret;
}

static nokprobe_inline int
probe_mem_read(void *dest, void *src, size_t size)
{
	return probe_kernel_read(dest, src, size);
}

static nokprobe_inline int
probe_mem_read_user(void *dest, void *src, size_t size)
{
	const void __user *uaddr =  (__force const void __user *)src;

	return probe_user_read(dest, uaddr, size);
}

/* Note that we don't verify it, since the code does not come from user space */
static int
process_fetch_insn(struct fetch_insn *code, struct pt_regs *regs, void *dest,
		   void *base)
{
	unsigned long val;

retry:
	/* 1st stage: get value from context */
	switch (code->op) {
	case FETCH_OP_REG:
		val = regs_get_register(regs, code->param);
		break;
	case FETCH_OP_STACK:
		val = regs_get_kernel_stack_nth(regs, code->param);
		break;
	case FETCH_OP_STACKP:
		val = kernel_stack_pointer(regs);
		break;
	case FETCH_OP_RETVAL:
		val = regs_return_value(regs);
		break;
	case FETCH_OP_IMM:
		val = code->immediate;
		break;
	case FETCH_OP_COMM:
		val = (unsigned long)current->comm;
		break;
	case FETCH_OP_DATA:
		val = (unsigned long)code->data;
		break;
#ifdef CONFIG_HAVE_FUNCTION_ARG_ACCESS_API
	case FETCH_OP_ARG:
		val = regs_get_kernel_argument(regs, code->param);
		break;
#endif
	case FETCH_NOP_SYMBOL:	/* Ignore a place holder */
		code++;
		goto retry;
	default:
		return -EILSEQ;
	}
	code++;

	return process_fetch_insn_bottom(code, val, dest, base);
}
NOKPROBE_SYMBOL(process_fetch_insn)

/* Kprobe handler */
static nokprobe_inline void
__kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs,
		    struct trace_event_file *trace_file)
{
	struct kprobe_trace_entry_head *entry;
	struct ring_buffer_event *event;
	struct ring_buffer *buffer;
	int size, dsize, pc;
	unsigned long irq_flags;
	struct trace_event_call *call = trace_probe_event_call(&tk->tp);

	WARN_ON(call != trace_file->event_call);

	if (trace_trigger_soft_disabled(trace_file))
		return;

	local_save_flags(irq_flags);
	pc = preempt_count();

	dsize = __get_data_size(&tk->tp, regs);
	size = sizeof(*entry) + tk->tp.size + dsize;

	event = trace_event_buffer_lock_reserve(&buffer, trace_file,
						call->event.type,
						size, irq_flags, pc);
	if (!event)
		return;

	entry = ring_buffer_event_data(event);
	entry->ip = (unsigned long)tk->rp.kp.addr;
	store_trace_args(&entry[1], &tk->tp, regs, sizeof(*entry), dsize);

	event_trigger_unlock_commit_regs(trace_file, buffer, event,
					 entry, irq_flags, pc, regs);
}

static void
kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs)
{
	struct event_file_link *link;

	trace_probe_for_each_link_rcu(link, &tk->tp)
		__kprobe_trace_func(tk, regs, link->file);
}
NOKPROBE_SYMBOL(kprobe_trace_func);

/* Kretprobe handler */
static nokprobe_inline void
__kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
		       struct pt_regs *regs,
		       struct trace_event_file *trace_file)
{
	struct kretprobe_trace_entry_head *entry;
	struct ring_buffer_event *event;
	struct ring_buffer *buffer;
	int size, pc, dsize;
	unsigned long irq_flags;
	struct trace_event_call *call = trace_probe_event_call(&tk->tp);

	WARN_ON(call != trace_file->event_call);

	if (trace_trigger_soft_disabled(trace_file))
		return;

	local_save_flags(irq_flags);
	pc = preempt_count();

	dsize = __get_data_size(&tk->tp, regs);
	size = sizeof(*entry) + tk->tp.size + dsize;

	event = trace_event_buffer_lock_reserve(&buffer, trace_file,
						call->event.type,
						size, irq_flags, pc);
	if (!event)
		return;

	entry = ring_buffer_event_data(event);
	entry->func = (unsigned long)tk->rp.kp.addr;
	entry->ret_ip = (unsigned long)ri->ret_addr;
	store_trace_args(&entry[1], &tk->tp, regs, sizeof(*entry), dsize);

	event_trigger_unlock_commit_regs(trace_file, buffer, event,
					 entry, irq_flags, pc, regs);
}

static void
kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
		     struct pt_regs *regs)
{
	struct event_file_link *link;

	trace_probe_for_each_link_rcu(link, &tk->tp)
		__kretprobe_trace_func(tk, ri, regs, link->file);
}
NOKPROBE_SYMBOL(kretprobe_trace_func);

/* Event entry printers */
static enum print_line_t
print_kprobe_event(struct trace_iterator *iter, int flags,
		   struct trace_event *event)
{
	struct kprobe_trace_entry_head *field;
	struct trace_seq *s = &iter->seq;
	struct trace_probe *tp;

	field = (struct kprobe_trace_entry_head *)iter->ent;
	tp = trace_probe_primary_from_call(
		container_of(event, struct trace_event_call, event));
	if (WARN_ON_ONCE(!tp))
		goto out;

	trace_seq_printf(s, "%s: (", trace_probe_name(tp));

	if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET))
		goto out;

	trace_seq_putc(s, ')');

	if (print_probe_args(s, tp->args, tp->nr_args,
			     (u8 *)&field[1], field) < 0)
		goto out;

	trace_seq_putc(s, '\n');
 out:
	return trace_handle_return(s);
}

static enum print_line_t
print_kretprobe_event(struct trace_iterator *iter, int flags,
		      struct trace_event *event)
{
	struct kretprobe_trace_entry_head *field;
	struct trace_seq *s = &iter->seq;
	struct trace_probe *tp;

	field = (struct kretprobe_trace_entry_head *)iter->ent;
	tp = trace_probe_primary_from_call(
		container_of(event, struct trace_event_call, event));
	if (WARN_ON_ONCE(!tp))
		goto out;

	trace_seq_printf(s, "%s: (", trace_probe_name(tp));

	if (!seq_print_ip_sym(s, field->ret_ip, flags | TRACE_ITER_SYM_OFFSET))
		goto out;

	trace_seq_puts(s, " <- ");

	if (!seq_print_ip_sym(s, field->func, flags & ~TRACE_ITER_SYM_OFFSET))
		goto out;

	trace_seq_putc(s, ')');

	if (print_probe_args(s, tp->args, tp->nr_args,
			     (u8 *)&field[1], field) < 0)
		goto out;

	trace_seq_putc(s, '\n');

 out:
	return trace_handle_return(s);
}


static int kprobe_event_define_fields(struct trace_event_call *event_call)
{
	int ret;
	struct kprobe_trace_entry_head field;
	struct trace_probe *tp;

	tp = trace_probe_primary_from_call(event_call);
	if (WARN_ON_ONCE(!tp))
		return -ENOENT;

	DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0);

	return traceprobe_define_arg_fields(event_call, sizeof(field), tp);
}

static int kretprobe_event_define_fields(struct trace_event_call *event_call)
{
	int ret;
	struct kretprobe_trace_entry_head field;
	struct trace_probe *tp;

	tp = trace_probe_primary_from_call(event_call);
	if (WARN_ON_ONCE(!tp))
		return -ENOENT;

	DEFINE_FIELD(unsigned long, func, FIELD_STRING_FUNC, 0);
	DEFINE_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP, 0);

	return traceprobe_define_arg_fields(event_call, sizeof(field), tp);
}

#ifdef CONFIG_PERF_EVENTS

/* Kprobe profile handler */
static int
kprobe_perf_func(struct trace_kprobe *tk, struct pt_regs *regs)
{
	struct trace_event_call *call = trace_probe_event_call(&tk->tp);
	struct kprobe_trace_entry_head *entry;
	struct hlist_head *head;
	int size, __size, dsize;
	int rctx;

	if (bpf_prog_array_valid(call)) {
		unsigned long orig_ip = instruction_pointer(regs);
		int ret;

		ret = trace_call_bpf(call, regs);

		/*
		 * We need to check and see if we modified the pc of the
		 * pt_regs, and if so return 1 so that we don't do the
		 * single stepping.
		 */
		if (orig_ip != instruction_pointer(regs))
			return 1;
		if (!ret)
			return 0;
	}

	head = this_cpu_ptr(call->perf_events);
	if (hlist_empty(head))
		return 0;

	dsize = __get_data_size(&tk->tp, regs);
	__size = sizeof(*entry) + tk->tp.size + dsize;
	size = ALIGN(__size + sizeof(u32), sizeof(u64));
	size -= sizeof(u32);

	entry = perf_trace_buf_alloc(size, NULL, &rctx);
	if (!entry)
		return 0;

	entry->ip = (unsigned long)tk->rp.kp.addr;
	memset(&entry[1], 0, dsize);
	store_trace_args(&entry[1], &tk->tp, regs, sizeof(*entry), dsize);
	perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs,
			      head, NULL);
	return 0;
}
NOKPROBE_SYMBOL(kprobe_perf_func);

/* Kretprobe profile handler */
static void
kretprobe_perf_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
		    struct pt_regs *regs)
{
	struct trace_event_call *call = trace_probe_event_call(&tk->tp);
	struct kretprobe_trace_entry_head *entry;
	struct hlist_head *head;
	int size, __size, dsize;
	int rctx;

	if (bpf_prog_array_valid(call) && !trace_call_bpf(call, regs))
		return;

	head = this_cpu_ptr(call->perf_events);
	if (hlist_empty(head))
		return;

	dsize = __get_data_size(&tk->tp, regs);
	__size = sizeof(*entry) + tk->tp.size + dsize;
	size = ALIGN(__size + sizeof(u32), sizeof(u64));
	size -= sizeof(u32);

	entry = perf_trace_buf_alloc(size, NULL, &rctx);
	if (!entry)
		return;

	entry->func = (unsigned long)tk->rp.kp.addr;
	entry->ret_ip = (unsigned long)ri->ret_addr;
	store_trace_args(&entry[1], &tk->tp, regs, sizeof(*entry), dsize);
	perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs,
			      head, NULL);
}
NOKPROBE_SYMBOL(kretprobe_perf_func);

int bpf_get_kprobe_info(const struct perf_event *event, u32 *fd_type,
			const char **symbol, u64 *probe_offset,
			u64 *probe_addr, bool perf_type_tracepoint)
{
	const char *pevent = trace_event_name(event->tp_event);
	const char *group = event->tp_event->class->system;
	struct trace_kprobe *tk;

	if (perf_type_tracepoint)
		tk = find_trace_kprobe(pevent, group);
	else
		tk = trace_kprobe_primary_from_call(event->tp_event);
	if (!tk)
		return -EINVAL;

	*fd_type = trace_kprobe_is_return(tk) ? BPF_FD_TYPE_KRETPROBE
					      : BPF_FD_TYPE_KPROBE;
	if (tk->symbol) {
		*symbol = tk->symbol;
		*probe_offset = tk->rp.kp.offset;
		*probe_addr = 0;
	} else {
		*symbol = NULL;
		*probe_offset = 0;
		*probe_addr = (unsigned long)tk->rp.kp.addr;
	}
	return 0;
}
#endif	/* CONFIG_PERF_EVENTS */

/*
 * called by perf_trace_init() or __ftrace_set_clr_event() under event_mutex.
 *
 * kprobe_trace_self_tests_init() does enable_trace_probe/disable_trace_probe
 * lockless, but we can't race with this __init function.
 */
static int kprobe_register(struct trace_event_call *event,
			   enum trace_reg type, void *data)
{
	struct trace_event_file *file = data;

	switch (type) {
	case TRACE_REG_REGISTER:
		return enable_trace_kprobe(event, file);
	case TRACE_REG_UNREGISTER:
		return disable_trace_kprobe(event, file);

#ifdef CONFIG_PERF_EVENTS
	case TRACE_REG_PERF_REGISTER:
		return enable_trace_kprobe(event, NULL);
	case TRACE_REG_PERF_UNREGISTER:
		return disable_trace_kprobe(event, NULL);
	case TRACE_REG_PERF_OPEN:
	case TRACE_REG_PERF_CLOSE:
	case TRACE_REG_PERF_ADD:
	case TRACE_REG_PERF_DEL:
		return 0;
#endif
	}
	return 0;
}

static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs)
{
	struct trace_kprobe *tk = container_of(kp, struct trace_kprobe, rp.kp);
	int ret = 0;

	raw_cpu_inc(*tk->nhit);

	if (trace_probe_test_flag(&tk->tp, TP_FLAG_TRACE))
		kprobe_trace_func(tk, regs);
#ifdef CONFIG_PERF_EVENTS
	if (trace_probe_test_flag(&tk->tp, TP_FLAG_PROFILE))
		ret = kprobe_perf_func(tk, regs);
#endif
	return ret;
}
NOKPROBE_SYMBOL(kprobe_dispatcher);

static int
kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs)
{
	struct trace_kprobe *tk = container_of(ri->rp, struct trace_kprobe, rp);

	raw_cpu_inc(*tk->nhit);

	if (trace_probe_test_flag(&tk->tp, TP_FLAG_TRACE))
		kretprobe_trace_func(tk, ri, regs);
#ifdef CONFIG_PERF_EVENTS
	if (trace_probe_test_flag(&tk->tp, TP_FLAG_PROFILE))
		kretprobe_perf_func(tk, ri, regs);
#endif
	return 0;	/* We don't tweek kernel, so just return 0 */
}
NOKPROBE_SYMBOL(kretprobe_dispatcher);

static struct trace_event_functions kretprobe_funcs = {
	.trace		= print_kretprobe_event
};

static struct trace_event_functions kprobe_funcs = {
	.trace		= print_kprobe_event
};

static inline void init_trace_event_call(struct trace_kprobe *tk)
{
	struct trace_event_call *call = trace_probe_event_call(&tk->tp);

	if (trace_kprobe_is_return(tk)) {
		call->event.funcs = &kretprobe_funcs;
		call->class->define_fields = kretprobe_event_define_fields;
	} else {
		call->event.funcs = &kprobe_funcs;
		call->class->define_fields = kprobe_event_define_fields;
	}

	call->flags = TRACE_EVENT_FL_KPROBE;
	call->class->reg = kprobe_register;
}

static int register_kprobe_event(struct trace_kprobe *tk)
{
	init_trace_event_call(tk);

	return trace_probe_register_event_call(&tk->tp);
}

static int unregister_kprobe_event(struct trace_kprobe *tk)
{
	return trace_probe_unregister_event_call(&tk->tp);
}

#ifdef CONFIG_PERF_EVENTS
/* create a trace_kprobe, but don't add it to global lists */
struct trace_event_call *
create_local_trace_kprobe(char *func, void *addr, unsigned long offs,
			  bool is_return)
{
	struct trace_kprobe *tk;
	int ret;
	char *event;

	/*
	 * local trace_kprobes are not added to dyn_event, so they are never
	 * searched in find_trace_kprobe(). Therefore, there is no concern of
	 * duplicated name here.
	 */
	event = func ? func : "DUMMY_EVENT";

	tk = alloc_trace_kprobe(KPROBE_EVENT_SYSTEM, event, (void *)addr, func,
				offs, 0 /* maxactive */, 0 /* nargs */,
				is_return);

	if (IS_ERR(tk)) {
		pr_info("Failed to allocate trace_probe.(%d)\n",
			(int)PTR_ERR(tk));
		return ERR_CAST(tk);
	}

	init_trace_event_call(tk);

	if (traceprobe_set_print_fmt(&tk->tp, trace_kprobe_is_return(tk)) < 0) {
		ret = -ENOMEM;
		goto error;
	}

	ret = __register_trace_kprobe(tk);
	if (ret < 0)
		goto error;

	return trace_probe_event_call(&tk->tp);
error:
	free_trace_kprobe(tk);
	return ERR_PTR(ret);
}

void destroy_local_trace_kprobe(struct trace_event_call *event_call)
{
	struct trace_kprobe *tk;

	tk = trace_kprobe_primary_from_call(event_call);
	if (unlikely(!tk))
		return;

	if (trace_probe_is_enabled(&tk->tp)) {
		WARN_ON(1);
		return;
	}

	__unregister_trace_kprobe(tk);

	free_trace_kprobe(tk);
}
#endif /* CONFIG_PERF_EVENTS */

static __init void enable_boot_kprobe_events(void)
{
	struct trace_array *tr = top_trace_array();
	struct trace_event_file *file;
	struct trace_kprobe *tk;
	struct dyn_event *pos;

	mutex_lock(&event_mutex);
	for_each_trace_kprobe(tk, pos) {
		list_for_each_entry(file, &tr->events, list)
			if (file->event_call == trace_probe_event_call(&tk->tp))
				trace_event_enable_disable(file, 1, 0);
	}
	mutex_unlock(&event_mutex);
}

static __init void setup_boot_kprobe_events(void)
{
	char *p, *cmd = kprobe_boot_events_buf;
	int ret;

	strreplace(kprobe_boot_events_buf, ',', ' ');

	while (cmd && *cmd != '\0') {
		p = strchr(cmd, ';');
		if (p)
			*p++ = '\0';

		ret = trace_run_command(cmd, create_or_delete_trace_kprobe);
		if (ret)
			pr_warn("Failed to add event(%d): %s\n", ret, cmd);
		else
			kprobe_boot_events_enabled = true;

		cmd = p;
	}

	enable_boot_kprobe_events();
}

/* Make a tracefs interface for controlling probe points */
static __init int init_kprobe_trace(void)
{
	struct dentry *d_tracer;
	struct dentry *entry;
	int ret;

	ret = dyn_event_register(&trace_kprobe_ops);
	if (ret)
		return ret;

	if (register_module_notifier(&trace_kprobe_module_nb))
		return -EINVAL;

	d_tracer = tracing_init_dentry();
	if (IS_ERR(d_tracer))
		return 0;

	entry = tracefs_create_file("kprobe_events", 0644, d_tracer,
				    NULL, &kprobe_events_ops);

	/* Event list interface */
	if (!entry)
		pr_warn("Could not create tracefs 'kprobe_events' entry\n");

	/* Profile interface */
	entry = tracefs_create_file("kprobe_profile", 0444, d_tracer,
				    NULL, &kprobe_profile_ops);

	if (!entry)
		pr_warn("Could not create tracefs 'kprobe_profile' entry\n");

	setup_boot_kprobe_events();

	return 0;
}
fs_initcall(init_kprobe_trace);


#ifdef CONFIG_FTRACE_STARTUP_TEST
static __init struct trace_event_file *
find_trace_probe_file(struct trace_kprobe *tk, struct trace_array *tr)
{
	struct trace_event_file *file;

	list_for_each_entry(file, &tr->events, list)
		if (file->event_call == trace_probe_event_call(&tk->tp))
			return file;

	return NULL;
}

/*
 * Nobody but us can call enable_trace_kprobe/disable_trace_kprobe at this
 * stage, we can do this lockless.
 */
static __init int kprobe_trace_self_tests_init(void)
{
	int ret, warn = 0;
	int (*target)(int, int, int, int, int, int);
	struct trace_kprobe *tk;
	struct trace_event_file *file;

	if (tracing_is_disabled())
		return -ENODEV;

	if (kprobe_boot_events_enabled) {
		pr_info("Skipping kprobe tests due to kprobe_event on cmdline\n");
		return 0;
	}

	target = kprobe_trace_selftest_target;

	pr_info("Testing kprobe tracing: ");

	ret = trace_run_command("p:testprobe kprobe_trace_selftest_target $stack $stack0 +0($stack)",
				create_or_delete_trace_kprobe);
	if (WARN_ON_ONCE(ret)) {
		pr_warn("error on probing function entry.\n");
		warn++;
	} else {
		/* Enable trace point */
		tk = find_trace_kprobe("testprobe", KPROBE_EVENT_SYSTEM);
		if (WARN_ON_ONCE(tk == NULL)) {
			pr_warn("error on getting new probe.\n");
			warn++;
		} else {
			file = find_trace_probe_file(tk, top_trace_array());
			if (WARN_ON_ONCE(file == NULL)) {
				pr_warn("error on getting probe file.\n");
				warn++;
			} else
				enable_trace_kprobe(
					trace_probe_event_call(&tk->tp), file);
		}
	}

	ret = trace_run_command("r:testprobe2 kprobe_trace_selftest_target $retval",
				create_or_delete_trace_kprobe);
	if (WARN_ON_ONCE(ret)) {
		pr_warn("error on probing function return.\n");
		warn++;
	} else {
		/* Enable trace point */
		tk = find_trace_kprobe("testprobe2", KPROBE_EVENT_SYSTEM);
		if (WARN_ON_ONCE(tk == NULL)) {
			pr_warn("error on getting 2nd new probe.\n");
			warn++;
		} else {
			file = find_trace_probe_file(tk, top_trace_array());
			if (WARN_ON_ONCE(file == NULL)) {
				pr_warn("error on getting probe file.\n");
				warn++;
			} else
				enable_trace_kprobe(
					trace_probe_event_call(&tk->tp), file);
		}
	}

	if (warn)
		goto end;

	ret = target(1, 2, 3, 4, 5, 6);

	/*
	 * Not expecting an error here, the check is only to prevent the
	 * optimizer from removing the call to target() as otherwise there
	 * are no side-effects and the call is never performed.
	 */
	if (ret != 21)
		warn++;

	/* Disable trace points before removing it */
	tk = find_trace_kprobe("testprobe", KPROBE_EVENT_SYSTEM);
	if (WARN_ON_ONCE(tk == NULL)) {
		pr_warn("error on getting test probe.\n");
		warn++;
	} else {
		if (trace_kprobe_nhit(tk) != 1) {
			pr_warn("incorrect number of testprobe hits\n");
			warn++;
		}

		file = find_trace_probe_file(tk, top_trace_array());
		if (WARN_ON_ONCE(file == NULL)) {
			pr_warn("error on getting probe file.\n");
			warn++;
		} else
			disable_trace_kprobe(
				trace_probe_event_call(&tk->tp), file);
	}

	tk = find_trace_kprobe("testprobe2", KPROBE_EVENT_SYSTEM);
	if (WARN_ON_ONCE(tk == NULL)) {
		pr_warn("error on getting 2nd test probe.\n");
		warn++;
	} else {
		if (trace_kprobe_nhit(tk) != 1) {
			pr_warn("incorrect number of testprobe2 hits\n");
			warn++;
		}

		file = find_trace_probe_file(tk, top_trace_array());
		if (WARN_ON_ONCE(file == NULL)) {
			pr_warn("error on getting probe file.\n");
			warn++;
		} else
			disable_trace_kprobe(
				trace_probe_event_call(&tk->tp), file);
	}

	ret = trace_run_command("-:testprobe", create_or_delete_trace_kprobe);
	if (WARN_ON_ONCE(ret)) {
		pr_warn("error on deleting a probe.\n");
		warn++;
	}

	ret = trace_run_command("-:testprobe2", create_or_delete_trace_kprobe);
	if (WARN_ON_ONCE(ret)) {
		pr_warn("error on deleting a probe.\n");
		warn++;
	}

end:
	ret = dyn_events_release_all(&trace_kprobe_ops);
	if (WARN_ON_ONCE(ret)) {
		pr_warn("error on cleaning up probes.\n");
		warn++;
	}
	/*
	 * Wait for the optimizer work to finish. Otherwise it might fiddle
	 * with probes in already freed __init text.
	 */
	wait_for_kprobe_optimizer();
	if (warn)
		pr_cont("NG: Some tests are failed. Please check them.\n");
	else
		pr_cont("OK\n");
	return 0;
}

late_initcall(kprobe_trace_self_tests_init);

#endif