1 /*
2  * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21  * SOFTWARE.
22  *
23  * Authors:
24  *    Kevin Tian <kevin.tian@intel.com>
25  *    Zhi Wang <zhi.a.wang@intel.com>
26  *
27  * Contributors:
28  *    Min he <min.he@intel.com>
29  *
30  */
31 
32 #include <linux/eventfd.h>
33 
34 #include "i915_drv.h"
35 #include "i915_reg.h"
36 #include "gvt.h"
37 #include "trace.h"
38 
39 /* common offset among interrupt control registers */
40 #define regbase_to_isr(base)	(base)
41 #define regbase_to_imr(base)	(base + 0x4)
42 #define regbase_to_iir(base)	(base + 0x8)
43 #define regbase_to_ier(base)	(base + 0xC)
44 
45 #define iir_to_regbase(iir)    (iir - 0x8)
46 #define ier_to_regbase(ier)    (ier - 0xC)
47 
48 #define get_event_virt_handler(irq, e)	(irq->events[e].v_handler)
49 #define get_irq_info(irq, e)		(irq->events[e].info)
50 
51 #define irq_to_gvt(irq) \
52 	container_of(irq, struct intel_gvt, irq)
53 
54 static void update_upstream_irq(struct intel_vgpu *vgpu,
55 		struct intel_gvt_irq_info *info);
56 
57 static const char * const irq_name[INTEL_GVT_EVENT_MAX] = {
58 	[RCS_MI_USER_INTERRUPT] = "Render CS MI USER INTERRUPT",
59 	[RCS_DEBUG] = "Render EU debug from SVG",
60 	[RCS_MMIO_SYNC_FLUSH] = "Render MMIO sync flush status",
61 	[RCS_CMD_STREAMER_ERR] = "Render CS error interrupt",
62 	[RCS_PIPE_CONTROL] = "Render PIPE CONTROL notify",
63 	[RCS_WATCHDOG_EXCEEDED] = "Render CS Watchdog counter exceeded",
64 	[RCS_PAGE_DIRECTORY_FAULT] = "Render page directory faults",
65 	[RCS_AS_CONTEXT_SWITCH] = "Render AS Context Switch Interrupt",
66 
67 	[VCS_MI_USER_INTERRUPT] = "Video CS MI USER INTERRUPT",
68 	[VCS_MMIO_SYNC_FLUSH] = "Video MMIO sync flush status",
69 	[VCS_CMD_STREAMER_ERR] = "Video CS error interrupt",
70 	[VCS_MI_FLUSH_DW] = "Video MI FLUSH DW notify",
71 	[VCS_WATCHDOG_EXCEEDED] = "Video CS Watchdog counter exceeded",
72 	[VCS_PAGE_DIRECTORY_FAULT] = "Video page directory faults",
73 	[VCS_AS_CONTEXT_SWITCH] = "Video AS Context Switch Interrupt",
74 	[VCS2_MI_USER_INTERRUPT] = "VCS2 Video CS MI USER INTERRUPT",
75 	[VCS2_MI_FLUSH_DW] = "VCS2 Video MI FLUSH DW notify",
76 	[VCS2_AS_CONTEXT_SWITCH] = "VCS2 Context Switch Interrupt",
77 
78 	[BCS_MI_USER_INTERRUPT] = "Blitter CS MI USER INTERRUPT",
79 	[BCS_MMIO_SYNC_FLUSH] = "Billter MMIO sync flush status",
80 	[BCS_CMD_STREAMER_ERR] = "Blitter CS error interrupt",
81 	[BCS_MI_FLUSH_DW] = "Blitter MI FLUSH DW notify",
82 	[BCS_PAGE_DIRECTORY_FAULT] = "Blitter page directory faults",
83 	[BCS_AS_CONTEXT_SWITCH] = "Blitter AS Context Switch Interrupt",
84 
85 	[VECS_MI_FLUSH_DW] = "Video Enhanced Streamer MI FLUSH DW notify",
86 	[VECS_AS_CONTEXT_SWITCH] = "VECS Context Switch Interrupt",
87 
88 	[PIPE_A_FIFO_UNDERRUN] = "Pipe A FIFO underrun",
89 	[PIPE_A_CRC_ERR] = "Pipe A CRC error",
90 	[PIPE_A_CRC_DONE] = "Pipe A CRC done",
91 	[PIPE_A_VSYNC] = "Pipe A vsync",
92 	[PIPE_A_LINE_COMPARE] = "Pipe A line compare",
93 	[PIPE_A_ODD_FIELD] = "Pipe A odd field",
94 	[PIPE_A_EVEN_FIELD] = "Pipe A even field",
95 	[PIPE_A_VBLANK] = "Pipe A vblank",
96 	[PIPE_B_FIFO_UNDERRUN] = "Pipe B FIFO underrun",
97 	[PIPE_B_CRC_ERR] = "Pipe B CRC error",
98 	[PIPE_B_CRC_DONE] = "Pipe B CRC done",
99 	[PIPE_B_VSYNC] = "Pipe B vsync",
100 	[PIPE_B_LINE_COMPARE] = "Pipe B line compare",
101 	[PIPE_B_ODD_FIELD] = "Pipe B odd field",
102 	[PIPE_B_EVEN_FIELD] = "Pipe B even field",
103 	[PIPE_B_VBLANK] = "Pipe B vblank",
104 	[PIPE_C_VBLANK] = "Pipe C vblank",
105 	[DPST_PHASE_IN] = "DPST phase in event",
106 	[DPST_HISTOGRAM] = "DPST histogram event",
107 	[GSE] = "GSE",
108 	[DP_A_HOTPLUG] = "DP A Hotplug",
109 	[AUX_CHANNEL_A] = "AUX Channel A",
110 	[PERF_COUNTER] = "Performance counter",
111 	[POISON] = "Poison",
112 	[GTT_FAULT] = "GTT fault",
113 	[PRIMARY_A_FLIP_DONE] = "Primary Plane A flip done",
114 	[PRIMARY_B_FLIP_DONE] = "Primary Plane B flip done",
115 	[PRIMARY_C_FLIP_DONE] = "Primary Plane C flip done",
116 	[SPRITE_A_FLIP_DONE] = "Sprite Plane A flip done",
117 	[SPRITE_B_FLIP_DONE] = "Sprite Plane B flip done",
118 	[SPRITE_C_FLIP_DONE] = "Sprite Plane C flip done",
119 
120 	[PCU_THERMAL] = "PCU Thermal Event",
121 	[PCU_PCODE2DRIVER_MAILBOX] = "PCU pcode2driver mailbox event",
122 
123 	[FDI_RX_INTERRUPTS_TRANSCODER_A] = "FDI RX Interrupts Combined A",
124 	[AUDIO_CP_CHANGE_TRANSCODER_A] = "Audio CP Change Transcoder A",
125 	[AUDIO_CP_REQUEST_TRANSCODER_A] = "Audio CP Request Transcoder A",
126 	[FDI_RX_INTERRUPTS_TRANSCODER_B] = "FDI RX Interrupts Combined B",
127 	[AUDIO_CP_CHANGE_TRANSCODER_B] = "Audio CP Change Transcoder B",
128 	[AUDIO_CP_REQUEST_TRANSCODER_B] = "Audio CP Request Transcoder B",
129 	[FDI_RX_INTERRUPTS_TRANSCODER_C] = "FDI RX Interrupts Combined C",
130 	[AUDIO_CP_CHANGE_TRANSCODER_C] = "Audio CP Change Transcoder C",
131 	[AUDIO_CP_REQUEST_TRANSCODER_C] = "Audio CP Request Transcoder C",
132 	[ERR_AND_DBG] = "South Error and Debug Interrupts Combined",
133 	[GMBUS] = "Gmbus",
134 	[SDVO_B_HOTPLUG] = "SDVO B hotplug",
135 	[CRT_HOTPLUG] = "CRT Hotplug",
136 	[DP_B_HOTPLUG] = "DisplayPort/HDMI/DVI B Hotplug",
137 	[DP_C_HOTPLUG] = "DisplayPort/HDMI/DVI C Hotplug",
138 	[DP_D_HOTPLUG] = "DisplayPort/HDMI/DVI D Hotplug",
139 	[AUX_CHANNEL_B] = "AUX Channel B",
140 	[AUX_CHANNEL_C] = "AUX Channel C",
141 	[AUX_CHANNEL_D] = "AUX Channel D",
142 	[AUDIO_POWER_STATE_CHANGE_B] = "Audio Power State change Port B",
143 	[AUDIO_POWER_STATE_CHANGE_C] = "Audio Power State change Port C",
144 	[AUDIO_POWER_STATE_CHANGE_D] = "Audio Power State change Port D",
145 
146 	[INTEL_GVT_EVENT_RESERVED] = "RESERVED EVENTS!!!",
147 };
148 
regbase_to_irq_info(struct intel_gvt * gvt,unsigned int reg)149 static inline struct intel_gvt_irq_info *regbase_to_irq_info(
150 		struct intel_gvt *gvt,
151 		unsigned int reg)
152 {
153 	struct intel_gvt_irq *irq = &gvt->irq;
154 	int i;
155 
156 	for_each_set_bit(i, irq->irq_info_bitmap, INTEL_GVT_IRQ_INFO_MAX) {
157 		if (i915_mmio_reg_offset(irq->info[i]->reg_base) == reg)
158 			return irq->info[i];
159 	}
160 
161 	return NULL;
162 }
163 
164 /**
165  * intel_vgpu_reg_imr_handler - Generic IMR register emulation write handler
166  * @vgpu: a vGPU
167  * @reg: register offset written by guest
168  * @p_data: register data written by guest
169  * @bytes: register data length
170  *
171  * This function is used to emulate the generic IMR register bit change
172  * behavior.
173  *
174  * Returns:
175  * Zero on success, negative error code if failed.
176  *
177  */
intel_vgpu_reg_imr_handler(struct intel_vgpu * vgpu,unsigned int reg,void * p_data,unsigned int bytes)178 int intel_vgpu_reg_imr_handler(struct intel_vgpu *vgpu,
179 	unsigned int reg, void *p_data, unsigned int bytes)
180 {
181 	struct intel_gvt *gvt = vgpu->gvt;
182 	const struct intel_gvt_irq_ops *ops = gvt->irq.ops;
183 	u32 imr = *(u32 *)p_data;
184 
185 	trace_write_ir(vgpu->id, "IMR", reg, imr, vgpu_vreg(vgpu, reg),
186 		       (vgpu_vreg(vgpu, reg) ^ imr));
187 
188 	vgpu_vreg(vgpu, reg) = imr;
189 
190 	ops->check_pending_irq(vgpu);
191 
192 	return 0;
193 }
194 
195 /**
196  * intel_vgpu_reg_master_irq_handler - master IRQ write emulation handler
197  * @vgpu: a vGPU
198  * @reg: register offset written by guest
199  * @p_data: register data written by guest
200  * @bytes: register data length
201  *
202  * This function is used to emulate the master IRQ register on gen8+.
203  *
204  * Returns:
205  * Zero on success, negative error code if failed.
206  *
207  */
intel_vgpu_reg_master_irq_handler(struct intel_vgpu * vgpu,unsigned int reg,void * p_data,unsigned int bytes)208 int intel_vgpu_reg_master_irq_handler(struct intel_vgpu *vgpu,
209 	unsigned int reg, void *p_data, unsigned int bytes)
210 {
211 	struct intel_gvt *gvt = vgpu->gvt;
212 	const struct intel_gvt_irq_ops *ops = gvt->irq.ops;
213 	u32 ier = *(u32 *)p_data;
214 	u32 virtual_ier = vgpu_vreg(vgpu, reg);
215 
216 	trace_write_ir(vgpu->id, "MASTER_IRQ", reg, ier, virtual_ier,
217 		       (virtual_ier ^ ier));
218 
219 	/*
220 	 * GEN8_MASTER_IRQ is a special irq register,
221 	 * only bit 31 is allowed to be modified
222 	 * and treated as an IER bit.
223 	 */
224 	ier &= GEN8_MASTER_IRQ_CONTROL;
225 	virtual_ier &= GEN8_MASTER_IRQ_CONTROL;
226 	vgpu_vreg(vgpu, reg) &= ~GEN8_MASTER_IRQ_CONTROL;
227 	vgpu_vreg(vgpu, reg) |= ier;
228 
229 	ops->check_pending_irq(vgpu);
230 
231 	return 0;
232 }
233 
234 /**
235  * intel_vgpu_reg_ier_handler - Generic IER write emulation handler
236  * @vgpu: a vGPU
237  * @reg: register offset written by guest
238  * @p_data: register data written by guest
239  * @bytes: register data length
240  *
241  * This function is used to emulate the generic IER register behavior.
242  *
243  * Returns:
244  * Zero on success, negative error code if failed.
245  *
246  */
intel_vgpu_reg_ier_handler(struct intel_vgpu * vgpu,unsigned int reg,void * p_data,unsigned int bytes)247 int intel_vgpu_reg_ier_handler(struct intel_vgpu *vgpu,
248 	unsigned int reg, void *p_data, unsigned int bytes)
249 {
250 	struct intel_gvt *gvt = vgpu->gvt;
251 	struct drm_i915_private *i915 = gvt->gt->i915;
252 	const struct intel_gvt_irq_ops *ops = gvt->irq.ops;
253 	struct intel_gvt_irq_info *info;
254 	u32 ier = *(u32 *)p_data;
255 
256 	trace_write_ir(vgpu->id, "IER", reg, ier, vgpu_vreg(vgpu, reg),
257 		       (vgpu_vreg(vgpu, reg) ^ ier));
258 
259 	vgpu_vreg(vgpu, reg) = ier;
260 
261 	info = regbase_to_irq_info(gvt, ier_to_regbase(reg));
262 	if (drm_WARN_ON(&i915->drm, !info))
263 		return -EINVAL;
264 
265 	if (info->has_upstream_irq)
266 		update_upstream_irq(vgpu, info);
267 
268 	ops->check_pending_irq(vgpu);
269 
270 	return 0;
271 }
272 
273 /**
274  * intel_vgpu_reg_iir_handler - Generic IIR write emulation handler
275  * @vgpu: a vGPU
276  * @reg: register offset written by guest
277  * @p_data: register data written by guest
278  * @bytes: register data length
279  *
280  * This function is used to emulate the generic IIR register behavior.
281  *
282  * Returns:
283  * Zero on success, negative error code if failed.
284  *
285  */
intel_vgpu_reg_iir_handler(struct intel_vgpu * vgpu,unsigned int reg,void * p_data,unsigned int bytes)286 int intel_vgpu_reg_iir_handler(struct intel_vgpu *vgpu, unsigned int reg,
287 	void *p_data, unsigned int bytes)
288 {
289 	struct drm_i915_private *i915 = vgpu->gvt->gt->i915;
290 	struct intel_gvt_irq_info *info = regbase_to_irq_info(vgpu->gvt,
291 		iir_to_regbase(reg));
292 	u32 iir = *(u32 *)p_data;
293 
294 	trace_write_ir(vgpu->id, "IIR", reg, iir, vgpu_vreg(vgpu, reg),
295 		       (vgpu_vreg(vgpu, reg) ^ iir));
296 
297 	if (drm_WARN_ON(&i915->drm, !info))
298 		return -EINVAL;
299 
300 	vgpu_vreg(vgpu, reg) &= ~iir;
301 
302 	if (info->has_upstream_irq)
303 		update_upstream_irq(vgpu, info);
304 	return 0;
305 }
306 
307 static struct intel_gvt_irq_map gen8_irq_map[] = {
308 	{ INTEL_GVT_IRQ_INFO_MASTER, 0, INTEL_GVT_IRQ_INFO_GT0, 0xffff },
309 	{ INTEL_GVT_IRQ_INFO_MASTER, 1, INTEL_GVT_IRQ_INFO_GT0, 0xffff0000 },
310 	{ INTEL_GVT_IRQ_INFO_MASTER, 2, INTEL_GVT_IRQ_INFO_GT1, 0xffff },
311 	{ INTEL_GVT_IRQ_INFO_MASTER, 3, INTEL_GVT_IRQ_INFO_GT1, 0xffff0000 },
312 	{ INTEL_GVT_IRQ_INFO_MASTER, 4, INTEL_GVT_IRQ_INFO_GT2, 0xffff },
313 	{ INTEL_GVT_IRQ_INFO_MASTER, 6, INTEL_GVT_IRQ_INFO_GT3, 0xffff },
314 	{ INTEL_GVT_IRQ_INFO_MASTER, 16, INTEL_GVT_IRQ_INFO_DE_PIPE_A, ~0 },
315 	{ INTEL_GVT_IRQ_INFO_MASTER, 17, INTEL_GVT_IRQ_INFO_DE_PIPE_B, ~0 },
316 	{ INTEL_GVT_IRQ_INFO_MASTER, 18, INTEL_GVT_IRQ_INFO_DE_PIPE_C, ~0 },
317 	{ INTEL_GVT_IRQ_INFO_MASTER, 20, INTEL_GVT_IRQ_INFO_DE_PORT, ~0 },
318 	{ INTEL_GVT_IRQ_INFO_MASTER, 22, INTEL_GVT_IRQ_INFO_DE_MISC, ~0 },
319 	{ INTEL_GVT_IRQ_INFO_MASTER, 23, INTEL_GVT_IRQ_INFO_PCH, ~0 },
320 	{ INTEL_GVT_IRQ_INFO_MASTER, 30, INTEL_GVT_IRQ_INFO_PCU, ~0 },
321 	{ -1, -1, ~0 },
322 };
323 
update_upstream_irq(struct intel_vgpu * vgpu,struct intel_gvt_irq_info * info)324 static void update_upstream_irq(struct intel_vgpu *vgpu,
325 		struct intel_gvt_irq_info *info)
326 {
327 	struct drm_i915_private *i915 = vgpu->gvt->gt->i915;
328 	struct intel_gvt_irq *irq = &vgpu->gvt->irq;
329 	struct intel_gvt_irq_map *map = irq->irq_map;
330 	struct intel_gvt_irq_info *up_irq_info = NULL;
331 	u32 set_bits = 0;
332 	u32 clear_bits = 0;
333 	int bit;
334 	u32 val = vgpu_vreg(vgpu,
335 			regbase_to_iir(i915_mmio_reg_offset(info->reg_base)))
336 		& vgpu_vreg(vgpu,
337 			regbase_to_ier(i915_mmio_reg_offset(info->reg_base)));
338 
339 	if (!info->has_upstream_irq)
340 		return;
341 
342 	for (map = irq->irq_map; map->up_irq_bit != -1; map++) {
343 		if (info->group != map->down_irq_group)
344 			continue;
345 
346 		if (!up_irq_info)
347 			up_irq_info = irq->info[map->up_irq_group];
348 		else
349 			drm_WARN_ON(&i915->drm, up_irq_info !=
350 				    irq->info[map->up_irq_group]);
351 
352 		bit = map->up_irq_bit;
353 
354 		if (val & map->down_irq_bitmask)
355 			set_bits |= (1 << bit);
356 		else
357 			clear_bits |= (1 << bit);
358 	}
359 
360 	if (drm_WARN_ON(&i915->drm, !up_irq_info))
361 		return;
362 
363 	if (up_irq_info->group == INTEL_GVT_IRQ_INFO_MASTER) {
364 		u32 isr = i915_mmio_reg_offset(up_irq_info->reg_base);
365 
366 		vgpu_vreg(vgpu, isr) &= ~clear_bits;
367 		vgpu_vreg(vgpu, isr) |= set_bits;
368 	} else {
369 		u32 iir = regbase_to_iir(
370 			i915_mmio_reg_offset(up_irq_info->reg_base));
371 		u32 imr = regbase_to_imr(
372 			i915_mmio_reg_offset(up_irq_info->reg_base));
373 
374 		vgpu_vreg(vgpu, iir) |= (set_bits & ~vgpu_vreg(vgpu, imr));
375 	}
376 
377 	if (up_irq_info->has_upstream_irq)
378 		update_upstream_irq(vgpu, up_irq_info);
379 }
380 
init_irq_map(struct intel_gvt_irq * irq)381 static void init_irq_map(struct intel_gvt_irq *irq)
382 {
383 	struct intel_gvt_irq_map *map;
384 	struct intel_gvt_irq_info *up_info, *down_info;
385 	int up_bit;
386 
387 	for (map = irq->irq_map; map->up_irq_bit != -1; map++) {
388 		up_info = irq->info[map->up_irq_group];
389 		up_bit = map->up_irq_bit;
390 		down_info = irq->info[map->down_irq_group];
391 
392 		set_bit(up_bit, up_info->downstream_irq_bitmap);
393 		down_info->has_upstream_irq = true;
394 
395 		gvt_dbg_irq("[up] grp %d bit %d -> [down] grp %d bitmask %x\n",
396 			up_info->group, up_bit,
397 			down_info->group, map->down_irq_bitmask);
398 	}
399 }
400 
401 /* =======================vEvent injection===================== */
402 
403 #define MSI_CAP_CONTROL(offset) (offset + 2)
404 #define MSI_CAP_ADDRESS(offset) (offset + 4)
405 #define MSI_CAP_DATA(offset) (offset + 8)
406 #define MSI_CAP_EN 0x1
407 
inject_virtual_interrupt(struct intel_vgpu * vgpu)408 static int inject_virtual_interrupt(struct intel_vgpu *vgpu)
409 {
410 	unsigned long offset = vgpu->gvt->device_info.msi_cap_offset;
411 	u16 control, data;
412 	u32 addr;
413 
414 	control = *(u16 *)(vgpu_cfg_space(vgpu) + MSI_CAP_CONTROL(offset));
415 	addr = *(u32 *)(vgpu_cfg_space(vgpu) + MSI_CAP_ADDRESS(offset));
416 	data = *(u16 *)(vgpu_cfg_space(vgpu) + MSI_CAP_DATA(offset));
417 
418 	/* Do not generate MSI if MSIEN is disabled */
419 	if (!(control & MSI_CAP_EN))
420 		return 0;
421 
422 	if (WARN(control & GENMASK(15, 1), "only support one MSI format\n"))
423 		return -EINVAL;
424 
425 	trace_inject_msi(vgpu->id, addr, data);
426 
427 	/*
428 	 * When guest is powered off, msi_trigger is set to NULL, but vgpu's
429 	 * config and mmio register isn't restored to default during guest
430 	 * poweroff. If this vgpu is still used in next vm, this vgpu's pipe
431 	 * may be enabled, then once this vgpu is active, it will get inject
432 	 * vblank interrupt request. But msi_trigger is null until msi is
433 	 * enabled by guest. so if msi_trigger is null, success is still
434 	 * returned and don't inject interrupt into guest.
435 	 */
436 	if (!test_bit(INTEL_VGPU_STATUS_ATTACHED, vgpu->status))
437 		return -ESRCH;
438 	if (vgpu->msi_trigger && eventfd_signal(vgpu->msi_trigger, 1) != 1)
439 		return -EFAULT;
440 	return 0;
441 }
442 
propagate_event(struct intel_gvt_irq * irq,enum intel_gvt_event_type event,struct intel_vgpu * vgpu)443 static void propagate_event(struct intel_gvt_irq *irq,
444 	enum intel_gvt_event_type event, struct intel_vgpu *vgpu)
445 {
446 	struct intel_gvt_irq_info *info;
447 	unsigned int reg_base;
448 	int bit;
449 
450 	info = get_irq_info(irq, event);
451 	if (WARN_ON(!info))
452 		return;
453 
454 	reg_base = i915_mmio_reg_offset(info->reg_base);
455 	bit = irq->events[event].bit;
456 
457 	if (!test_bit(bit, (void *)&vgpu_vreg(vgpu,
458 					regbase_to_imr(reg_base)))) {
459 		trace_propagate_event(vgpu->id, irq_name[event], bit);
460 		set_bit(bit, (void *)&vgpu_vreg(vgpu,
461 					regbase_to_iir(reg_base)));
462 	}
463 }
464 
465 /* =======================vEvent Handlers===================== */
handle_default_event_virt(struct intel_gvt_irq * irq,enum intel_gvt_event_type event,struct intel_vgpu * vgpu)466 static void handle_default_event_virt(struct intel_gvt_irq *irq,
467 	enum intel_gvt_event_type event, struct intel_vgpu *vgpu)
468 {
469 	if (!vgpu->irq.irq_warn_once[event]) {
470 		gvt_dbg_core("vgpu%d: IRQ receive event %d (%s)\n",
471 			vgpu->id, event, irq_name[event]);
472 		vgpu->irq.irq_warn_once[event] = true;
473 	}
474 	propagate_event(irq, event, vgpu);
475 }
476 
477 /* =====================GEN specific logic======================= */
478 /* GEN8 interrupt routines. */
479 
480 #define DEFINE_GVT_GEN8_INTEL_GVT_IRQ_INFO(regname, regbase) \
481 static struct intel_gvt_irq_info gen8_##regname##_info = { \
482 	.name = #regname"-IRQ", \
483 	.reg_base = (regbase), \
484 	.bit_to_event = {[0 ... INTEL_GVT_IRQ_BITWIDTH-1] = \
485 		INTEL_GVT_EVENT_RESERVED}, \
486 }
487 
488 DEFINE_GVT_GEN8_INTEL_GVT_IRQ_INFO(gt0, GEN8_GT_ISR(0));
489 DEFINE_GVT_GEN8_INTEL_GVT_IRQ_INFO(gt1, GEN8_GT_ISR(1));
490 DEFINE_GVT_GEN8_INTEL_GVT_IRQ_INFO(gt2, GEN8_GT_ISR(2));
491 DEFINE_GVT_GEN8_INTEL_GVT_IRQ_INFO(gt3, GEN8_GT_ISR(3));
492 DEFINE_GVT_GEN8_INTEL_GVT_IRQ_INFO(de_pipe_a, GEN8_DE_PIPE_ISR(PIPE_A));
493 DEFINE_GVT_GEN8_INTEL_GVT_IRQ_INFO(de_pipe_b, GEN8_DE_PIPE_ISR(PIPE_B));
494 DEFINE_GVT_GEN8_INTEL_GVT_IRQ_INFO(de_pipe_c, GEN8_DE_PIPE_ISR(PIPE_C));
495 DEFINE_GVT_GEN8_INTEL_GVT_IRQ_INFO(de_port, GEN8_DE_PORT_ISR);
496 DEFINE_GVT_GEN8_INTEL_GVT_IRQ_INFO(de_misc, GEN8_DE_MISC_ISR);
497 DEFINE_GVT_GEN8_INTEL_GVT_IRQ_INFO(pcu, GEN8_PCU_ISR);
498 DEFINE_GVT_GEN8_INTEL_GVT_IRQ_INFO(master, GEN8_MASTER_IRQ);
499 
500 static struct intel_gvt_irq_info gvt_base_pch_info = {
501 	.name = "PCH-IRQ",
502 	.reg_base = SDEISR,
503 	.bit_to_event = {[0 ... INTEL_GVT_IRQ_BITWIDTH-1] =
504 		INTEL_GVT_EVENT_RESERVED},
505 };
506 
gen8_check_pending_irq(struct intel_vgpu * vgpu)507 static void gen8_check_pending_irq(struct intel_vgpu *vgpu)
508 {
509 	struct intel_gvt_irq *irq = &vgpu->gvt->irq;
510 	int i;
511 
512 	if (!(vgpu_vreg(vgpu, i915_mmio_reg_offset(GEN8_MASTER_IRQ)) &
513 				GEN8_MASTER_IRQ_CONTROL))
514 		return;
515 
516 	for_each_set_bit(i, irq->irq_info_bitmap, INTEL_GVT_IRQ_INFO_MAX) {
517 		struct intel_gvt_irq_info *info = irq->info[i];
518 		u32 reg_base;
519 
520 		if (!info->has_upstream_irq)
521 			continue;
522 
523 		reg_base = i915_mmio_reg_offset(info->reg_base);
524 		if ((vgpu_vreg(vgpu, regbase_to_iir(reg_base))
525 				& vgpu_vreg(vgpu, regbase_to_ier(reg_base))))
526 			update_upstream_irq(vgpu, info);
527 	}
528 
529 	if (vgpu_vreg(vgpu, i915_mmio_reg_offset(GEN8_MASTER_IRQ))
530 			& ~GEN8_MASTER_IRQ_CONTROL)
531 		inject_virtual_interrupt(vgpu);
532 }
533 
gen8_init_irq(struct intel_gvt_irq * irq)534 static void gen8_init_irq(
535 		struct intel_gvt_irq *irq)
536 {
537 	struct intel_gvt *gvt = irq_to_gvt(irq);
538 
539 #define SET_BIT_INFO(s, b, e, i)		\
540 	do {					\
541 		s->events[e].bit = b;		\
542 		s->events[e].info = s->info[i];	\
543 		s->info[i]->bit_to_event[b] = e;\
544 	} while (0)
545 
546 #define SET_IRQ_GROUP(s, g, i) \
547 	do { \
548 		s->info[g] = i; \
549 		(i)->group = g; \
550 		set_bit(g, s->irq_info_bitmap); \
551 	} while (0)
552 
553 	SET_IRQ_GROUP(irq, INTEL_GVT_IRQ_INFO_MASTER, &gen8_master_info);
554 	SET_IRQ_GROUP(irq, INTEL_GVT_IRQ_INFO_GT0, &gen8_gt0_info);
555 	SET_IRQ_GROUP(irq, INTEL_GVT_IRQ_INFO_GT1, &gen8_gt1_info);
556 	SET_IRQ_GROUP(irq, INTEL_GVT_IRQ_INFO_GT2, &gen8_gt2_info);
557 	SET_IRQ_GROUP(irq, INTEL_GVT_IRQ_INFO_GT3, &gen8_gt3_info);
558 	SET_IRQ_GROUP(irq, INTEL_GVT_IRQ_INFO_DE_PIPE_A, &gen8_de_pipe_a_info);
559 	SET_IRQ_GROUP(irq, INTEL_GVT_IRQ_INFO_DE_PIPE_B, &gen8_de_pipe_b_info);
560 	SET_IRQ_GROUP(irq, INTEL_GVT_IRQ_INFO_DE_PIPE_C, &gen8_de_pipe_c_info);
561 	SET_IRQ_GROUP(irq, INTEL_GVT_IRQ_INFO_DE_PORT, &gen8_de_port_info);
562 	SET_IRQ_GROUP(irq, INTEL_GVT_IRQ_INFO_DE_MISC, &gen8_de_misc_info);
563 	SET_IRQ_GROUP(irq, INTEL_GVT_IRQ_INFO_PCU, &gen8_pcu_info);
564 	SET_IRQ_GROUP(irq, INTEL_GVT_IRQ_INFO_PCH, &gvt_base_pch_info);
565 
566 	/* GEN8 level 2 interrupts. */
567 
568 	/* GEN8 interrupt GT0 events */
569 	SET_BIT_INFO(irq, 0, RCS_MI_USER_INTERRUPT, INTEL_GVT_IRQ_INFO_GT0);
570 	SET_BIT_INFO(irq, 4, RCS_PIPE_CONTROL, INTEL_GVT_IRQ_INFO_GT0);
571 	SET_BIT_INFO(irq, 8, RCS_AS_CONTEXT_SWITCH, INTEL_GVT_IRQ_INFO_GT0);
572 
573 	SET_BIT_INFO(irq, 16, BCS_MI_USER_INTERRUPT, INTEL_GVT_IRQ_INFO_GT0);
574 	SET_BIT_INFO(irq, 20, BCS_MI_FLUSH_DW, INTEL_GVT_IRQ_INFO_GT0);
575 	SET_BIT_INFO(irq, 24, BCS_AS_CONTEXT_SWITCH, INTEL_GVT_IRQ_INFO_GT0);
576 
577 	/* GEN8 interrupt GT1 events */
578 	SET_BIT_INFO(irq, 0, VCS_MI_USER_INTERRUPT, INTEL_GVT_IRQ_INFO_GT1);
579 	SET_BIT_INFO(irq, 4, VCS_MI_FLUSH_DW, INTEL_GVT_IRQ_INFO_GT1);
580 	SET_BIT_INFO(irq, 8, VCS_AS_CONTEXT_SWITCH, INTEL_GVT_IRQ_INFO_GT1);
581 
582 	if (HAS_ENGINE(gvt->gt, VCS1)) {
583 		SET_BIT_INFO(irq, 16, VCS2_MI_USER_INTERRUPT,
584 			INTEL_GVT_IRQ_INFO_GT1);
585 		SET_BIT_INFO(irq, 20, VCS2_MI_FLUSH_DW,
586 			INTEL_GVT_IRQ_INFO_GT1);
587 		SET_BIT_INFO(irq, 24, VCS2_AS_CONTEXT_SWITCH,
588 			INTEL_GVT_IRQ_INFO_GT1);
589 	}
590 
591 	/* GEN8 interrupt GT3 events */
592 	SET_BIT_INFO(irq, 0, VECS_MI_USER_INTERRUPT, INTEL_GVT_IRQ_INFO_GT3);
593 	SET_BIT_INFO(irq, 4, VECS_MI_FLUSH_DW, INTEL_GVT_IRQ_INFO_GT3);
594 	SET_BIT_INFO(irq, 8, VECS_AS_CONTEXT_SWITCH, INTEL_GVT_IRQ_INFO_GT3);
595 
596 	SET_BIT_INFO(irq, 0, PIPE_A_VBLANK, INTEL_GVT_IRQ_INFO_DE_PIPE_A);
597 	SET_BIT_INFO(irq, 0, PIPE_B_VBLANK, INTEL_GVT_IRQ_INFO_DE_PIPE_B);
598 	SET_BIT_INFO(irq, 0, PIPE_C_VBLANK, INTEL_GVT_IRQ_INFO_DE_PIPE_C);
599 
600 	/* GEN8 interrupt DE PORT events */
601 	SET_BIT_INFO(irq, 0, AUX_CHANNEL_A, INTEL_GVT_IRQ_INFO_DE_PORT);
602 	SET_BIT_INFO(irq, 3, DP_A_HOTPLUG, INTEL_GVT_IRQ_INFO_DE_PORT);
603 
604 	/* GEN8 interrupt DE MISC events */
605 	SET_BIT_INFO(irq, 0, GSE, INTEL_GVT_IRQ_INFO_DE_MISC);
606 
607 	/* PCH events */
608 	SET_BIT_INFO(irq, 17, GMBUS, INTEL_GVT_IRQ_INFO_PCH);
609 	SET_BIT_INFO(irq, 19, CRT_HOTPLUG, INTEL_GVT_IRQ_INFO_PCH);
610 	SET_BIT_INFO(irq, 21, DP_B_HOTPLUG, INTEL_GVT_IRQ_INFO_PCH);
611 	SET_BIT_INFO(irq, 22, DP_C_HOTPLUG, INTEL_GVT_IRQ_INFO_PCH);
612 	SET_BIT_INFO(irq, 23, DP_D_HOTPLUG, INTEL_GVT_IRQ_INFO_PCH);
613 
614 	if (IS_BROADWELL(gvt->gt->i915)) {
615 		SET_BIT_INFO(irq, 25, AUX_CHANNEL_B, INTEL_GVT_IRQ_INFO_PCH);
616 		SET_BIT_INFO(irq, 26, AUX_CHANNEL_C, INTEL_GVT_IRQ_INFO_PCH);
617 		SET_BIT_INFO(irq, 27, AUX_CHANNEL_D, INTEL_GVT_IRQ_INFO_PCH);
618 
619 		SET_BIT_INFO(irq, 4, PRIMARY_A_FLIP_DONE, INTEL_GVT_IRQ_INFO_DE_PIPE_A);
620 		SET_BIT_INFO(irq, 5, SPRITE_A_FLIP_DONE, INTEL_GVT_IRQ_INFO_DE_PIPE_A);
621 
622 		SET_BIT_INFO(irq, 4, PRIMARY_B_FLIP_DONE, INTEL_GVT_IRQ_INFO_DE_PIPE_B);
623 		SET_BIT_INFO(irq, 5, SPRITE_B_FLIP_DONE, INTEL_GVT_IRQ_INFO_DE_PIPE_B);
624 
625 		SET_BIT_INFO(irq, 4, PRIMARY_C_FLIP_DONE, INTEL_GVT_IRQ_INFO_DE_PIPE_C);
626 		SET_BIT_INFO(irq, 5, SPRITE_C_FLIP_DONE, INTEL_GVT_IRQ_INFO_DE_PIPE_C);
627 	} else if (GRAPHICS_VER(gvt->gt->i915) >= 9) {
628 		SET_BIT_INFO(irq, 25, AUX_CHANNEL_B, INTEL_GVT_IRQ_INFO_DE_PORT);
629 		SET_BIT_INFO(irq, 26, AUX_CHANNEL_C, INTEL_GVT_IRQ_INFO_DE_PORT);
630 		SET_BIT_INFO(irq, 27, AUX_CHANNEL_D, INTEL_GVT_IRQ_INFO_DE_PORT);
631 
632 		SET_BIT_INFO(irq, 3, PRIMARY_A_FLIP_DONE, INTEL_GVT_IRQ_INFO_DE_PIPE_A);
633 		SET_BIT_INFO(irq, 3, PRIMARY_B_FLIP_DONE, INTEL_GVT_IRQ_INFO_DE_PIPE_B);
634 		SET_BIT_INFO(irq, 3, PRIMARY_C_FLIP_DONE, INTEL_GVT_IRQ_INFO_DE_PIPE_C);
635 
636 		SET_BIT_INFO(irq, 4, SPRITE_A_FLIP_DONE, INTEL_GVT_IRQ_INFO_DE_PIPE_A);
637 		SET_BIT_INFO(irq, 4, SPRITE_B_FLIP_DONE, INTEL_GVT_IRQ_INFO_DE_PIPE_B);
638 		SET_BIT_INFO(irq, 4, SPRITE_C_FLIP_DONE, INTEL_GVT_IRQ_INFO_DE_PIPE_C);
639 	}
640 
641 	/* GEN8 interrupt PCU events */
642 	SET_BIT_INFO(irq, 24, PCU_THERMAL, INTEL_GVT_IRQ_INFO_PCU);
643 	SET_BIT_INFO(irq, 25, PCU_PCODE2DRIVER_MAILBOX, INTEL_GVT_IRQ_INFO_PCU);
644 }
645 
646 static const struct intel_gvt_irq_ops gen8_irq_ops = {
647 	.init_irq = gen8_init_irq,
648 	.check_pending_irq = gen8_check_pending_irq,
649 };
650 
651 /**
652  * intel_vgpu_trigger_virtual_event - Trigger a virtual event for a vGPU
653  * @vgpu: a vGPU
654  * @event: interrupt event
655  *
656  * This function is used to trigger a virtual interrupt event for vGPU.
657  * The caller provides the event to be triggered, the framework itself
658  * will emulate the IRQ register bit change.
659  *
660  */
intel_vgpu_trigger_virtual_event(struct intel_vgpu * vgpu,enum intel_gvt_event_type event)661 void intel_vgpu_trigger_virtual_event(struct intel_vgpu *vgpu,
662 	enum intel_gvt_event_type event)
663 {
664 	struct drm_i915_private *i915 = vgpu->gvt->gt->i915;
665 	struct intel_gvt *gvt = vgpu->gvt;
666 	struct intel_gvt_irq *irq = &gvt->irq;
667 	gvt_event_virt_handler_t handler;
668 	const struct intel_gvt_irq_ops *ops = gvt->irq.ops;
669 
670 	handler = get_event_virt_handler(irq, event);
671 	drm_WARN_ON(&i915->drm, !handler);
672 
673 	handler(irq, event, vgpu);
674 
675 	ops->check_pending_irq(vgpu);
676 }
677 
init_events(struct intel_gvt_irq * irq)678 static void init_events(
679 	struct intel_gvt_irq *irq)
680 {
681 	int i;
682 
683 	for (i = 0; i < INTEL_GVT_EVENT_MAX; i++) {
684 		irq->events[i].info = NULL;
685 		irq->events[i].v_handler = handle_default_event_virt;
686 	}
687 }
688 
689 /**
690  * intel_gvt_init_irq - initialize GVT-g IRQ emulation subsystem
691  * @gvt: a GVT device
692  *
693  * This function is called at driver loading stage, to initialize the GVT-g IRQ
694  * emulation subsystem.
695  *
696  * Returns:
697  * Zero on success, negative error code if failed.
698  */
intel_gvt_init_irq(struct intel_gvt * gvt)699 int intel_gvt_init_irq(struct intel_gvt *gvt)
700 {
701 	struct intel_gvt_irq *irq = &gvt->irq;
702 
703 	gvt_dbg_core("init irq framework\n");
704 
705 	irq->ops = &gen8_irq_ops;
706 	irq->irq_map = gen8_irq_map;
707 
708 	/* common event initialization */
709 	init_events(irq);
710 
711 	/* gen specific initialization */
712 	irq->ops->init_irq(irq);
713 
714 	init_irq_map(irq);
715 
716 	return 0;
717 }
718