xref: /openbmc/linux/drivers/gpu/drm/i915/i915_pci.c (revision 5d0e4d78)
1 /*
2  * Copyright © 2016 Intel Corporation
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
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21  * IN THE SOFTWARE.
22  *
23  */
24 
25 #include <linux/console.h>
26 #include <linux/vgaarb.h>
27 #include <linux/vga_switcheroo.h>
28 
29 #include "i915_drv.h"
30 #include "i915_selftest.h"
31 
32 #define GEN_DEFAULT_PIPEOFFSETS \
33 	.pipe_offsets = { PIPE_A_OFFSET, PIPE_B_OFFSET, \
34 			  PIPE_C_OFFSET, PIPE_EDP_OFFSET }, \
35 	.trans_offsets = { TRANSCODER_A_OFFSET, TRANSCODER_B_OFFSET, \
36 			   TRANSCODER_C_OFFSET, TRANSCODER_EDP_OFFSET }, \
37 	.palette_offsets = { PALETTE_A_OFFSET, PALETTE_B_OFFSET }
38 
39 #define GEN_CHV_PIPEOFFSETS \
40 	.pipe_offsets = { PIPE_A_OFFSET, PIPE_B_OFFSET, \
41 			  CHV_PIPE_C_OFFSET }, \
42 	.trans_offsets = { TRANSCODER_A_OFFSET, TRANSCODER_B_OFFSET, \
43 			   CHV_TRANSCODER_C_OFFSET, }, \
44 	.palette_offsets = { PALETTE_A_OFFSET, PALETTE_B_OFFSET, \
45 			     CHV_PALETTE_C_OFFSET }
46 
47 #define CURSOR_OFFSETS \
48 	.cursor_offsets = { CURSOR_A_OFFSET, CURSOR_B_OFFSET, CHV_CURSOR_C_OFFSET }
49 
50 #define IVB_CURSOR_OFFSETS \
51 	.cursor_offsets = { CURSOR_A_OFFSET, IVB_CURSOR_B_OFFSET, IVB_CURSOR_C_OFFSET }
52 
53 #define BDW_COLORS \
54 	.color = { .degamma_lut_size = 512, .gamma_lut_size = 512 }
55 #define CHV_COLORS \
56 	.color = { .degamma_lut_size = 65, .gamma_lut_size = 257 }
57 
58 /* Keep in gen based order, and chronological order within a gen */
59 #define GEN2_FEATURES \
60 	.gen = 2, .num_pipes = 1, \
61 	.has_overlay = 1, .overlay_needs_physical = 1, \
62 	.has_gmch_display = 1, \
63 	.hws_needs_physical = 1, \
64 	.unfenced_needs_alignment = 1, \
65 	.ring_mask = RENDER_RING, \
66 	GEN_DEFAULT_PIPEOFFSETS, \
67 	CURSOR_OFFSETS
68 
69 static const struct intel_device_info intel_i830_info = {
70 	GEN2_FEATURES,
71 	.platform = INTEL_I830,
72 	.is_mobile = 1, .cursor_needs_physical = 1,
73 	.num_pipes = 2, /* legal, last one wins */
74 };
75 
76 static const struct intel_device_info intel_i845g_info = {
77 	GEN2_FEATURES,
78 	.platform = INTEL_I845G,
79 };
80 
81 static const struct intel_device_info intel_i85x_info = {
82 	GEN2_FEATURES,
83 	.platform = INTEL_I85X, .is_mobile = 1,
84 	.num_pipes = 2, /* legal, last one wins */
85 	.cursor_needs_physical = 1,
86 	.has_fbc = 1,
87 };
88 
89 static const struct intel_device_info intel_i865g_info = {
90 	GEN2_FEATURES,
91 	.platform = INTEL_I865G,
92 };
93 
94 #define GEN3_FEATURES \
95 	.gen = 3, .num_pipes = 2, \
96 	.has_gmch_display = 1, \
97 	.ring_mask = RENDER_RING, \
98 	GEN_DEFAULT_PIPEOFFSETS, \
99 	CURSOR_OFFSETS
100 
101 static const struct intel_device_info intel_i915g_info = {
102 	GEN3_FEATURES,
103 	.platform = INTEL_I915G, .cursor_needs_physical = 1,
104 	.has_overlay = 1, .overlay_needs_physical = 1,
105 	.hws_needs_physical = 1,
106 	.unfenced_needs_alignment = 1,
107 };
108 
109 static const struct intel_device_info intel_i915gm_info = {
110 	GEN3_FEATURES,
111 	.platform = INTEL_I915GM,
112 	.is_mobile = 1,
113 	.cursor_needs_physical = 1,
114 	.has_overlay = 1, .overlay_needs_physical = 1,
115 	.supports_tv = 1,
116 	.has_fbc = 1,
117 	.hws_needs_physical = 1,
118 	.unfenced_needs_alignment = 1,
119 };
120 
121 static const struct intel_device_info intel_i945g_info = {
122 	GEN3_FEATURES,
123 	.platform = INTEL_I945G,
124 	.has_hotplug = 1, .cursor_needs_physical = 1,
125 	.has_overlay = 1, .overlay_needs_physical = 1,
126 	.hws_needs_physical = 1,
127 	.unfenced_needs_alignment = 1,
128 };
129 
130 static const struct intel_device_info intel_i945gm_info = {
131 	GEN3_FEATURES,
132 	.platform = INTEL_I945GM, .is_mobile = 1,
133 	.has_hotplug = 1, .cursor_needs_physical = 1,
134 	.has_overlay = 1, .overlay_needs_physical = 1,
135 	.supports_tv = 1,
136 	.has_fbc = 1,
137 	.hws_needs_physical = 1,
138 	.unfenced_needs_alignment = 1,
139 };
140 
141 static const struct intel_device_info intel_g33_info = {
142 	GEN3_FEATURES,
143 	.platform = INTEL_G33,
144 	.has_hotplug = 1,
145 	.has_overlay = 1,
146 };
147 
148 static const struct intel_device_info intel_pineview_info = {
149 	GEN3_FEATURES,
150 	.platform = INTEL_PINEVIEW, .is_mobile = 1,
151 	.has_hotplug = 1,
152 	.has_overlay = 1,
153 };
154 
155 #define GEN4_FEATURES \
156 	.gen = 4, .num_pipes = 2, \
157 	.has_hotplug = 1, \
158 	.has_gmch_display = 1, \
159 	.ring_mask = RENDER_RING, \
160 	GEN_DEFAULT_PIPEOFFSETS, \
161 	CURSOR_OFFSETS
162 
163 static const struct intel_device_info intel_i965g_info = {
164 	GEN4_FEATURES,
165 	.platform = INTEL_I965G,
166 	.has_overlay = 1,
167 	.hws_needs_physical = 1,
168 };
169 
170 static const struct intel_device_info intel_i965gm_info = {
171 	GEN4_FEATURES,
172 	.platform = INTEL_I965GM,
173 	.is_mobile = 1, .has_fbc = 1,
174 	.has_overlay = 1,
175 	.supports_tv = 1,
176 	.hws_needs_physical = 1,
177 };
178 
179 static const struct intel_device_info intel_g45_info = {
180 	GEN4_FEATURES,
181 	.platform = INTEL_G45,
182 	.has_pipe_cxsr = 1,
183 	.ring_mask = RENDER_RING | BSD_RING,
184 };
185 
186 static const struct intel_device_info intel_gm45_info = {
187 	GEN4_FEATURES,
188 	.platform = INTEL_GM45,
189 	.is_mobile = 1, .has_fbc = 1,
190 	.has_pipe_cxsr = 1,
191 	.supports_tv = 1,
192 	.ring_mask = RENDER_RING | BSD_RING,
193 };
194 
195 #define GEN5_FEATURES \
196 	.gen = 5, .num_pipes = 2, \
197 	.has_hotplug = 1, \
198 	.has_gmbus_irq = 1, \
199 	.ring_mask = RENDER_RING | BSD_RING, \
200 	GEN_DEFAULT_PIPEOFFSETS, \
201 	CURSOR_OFFSETS
202 
203 static const struct intel_device_info intel_ironlake_d_info = {
204 	GEN5_FEATURES,
205 	.platform = INTEL_IRONLAKE,
206 };
207 
208 static const struct intel_device_info intel_ironlake_m_info = {
209 	GEN5_FEATURES,
210 	.platform = INTEL_IRONLAKE,
211 	.is_mobile = 1, .has_fbc = 1,
212 };
213 
214 #define GEN6_FEATURES \
215 	.gen = 6, .num_pipes = 2, \
216 	.has_hotplug = 1, \
217 	.has_fbc = 1, \
218 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING, \
219 	.has_llc = 1, \
220 	.has_rc6 = 1, \
221 	.has_rc6p = 1, \
222 	.has_gmbus_irq = 1, \
223 	.has_aliasing_ppgtt = 1, \
224 	GEN_DEFAULT_PIPEOFFSETS, \
225 	CURSOR_OFFSETS
226 
227 static const struct intel_device_info intel_sandybridge_d_info = {
228 	GEN6_FEATURES,
229 	.platform = INTEL_SANDYBRIDGE,
230 };
231 
232 static const struct intel_device_info intel_sandybridge_m_info = {
233 	GEN6_FEATURES,
234 	.platform = INTEL_SANDYBRIDGE,
235 	.is_mobile = 1,
236 };
237 
238 #define GEN7_FEATURES  \
239 	.gen = 7, .num_pipes = 3, \
240 	.has_hotplug = 1, \
241 	.has_fbc = 1, \
242 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING, \
243 	.has_llc = 1, \
244 	.has_rc6 = 1, \
245 	.has_rc6p = 1, \
246 	.has_gmbus_irq = 1, \
247 	.has_aliasing_ppgtt = 1, \
248 	.has_full_ppgtt = 1, \
249 	GEN_DEFAULT_PIPEOFFSETS, \
250 	IVB_CURSOR_OFFSETS
251 
252 static const struct intel_device_info intel_ivybridge_d_info = {
253 	GEN7_FEATURES,
254 	.platform = INTEL_IVYBRIDGE,
255 	.has_l3_dpf = 1,
256 };
257 
258 static const struct intel_device_info intel_ivybridge_m_info = {
259 	GEN7_FEATURES,
260 	.platform = INTEL_IVYBRIDGE,
261 	.is_mobile = 1,
262 	.has_l3_dpf = 1,
263 };
264 
265 static const struct intel_device_info intel_ivybridge_q_info = {
266 	GEN7_FEATURES,
267 	.platform = INTEL_IVYBRIDGE,
268 	.num_pipes = 0, /* legal, last one wins */
269 	.has_l3_dpf = 1,
270 };
271 
272 static const struct intel_device_info intel_valleyview_info = {
273 	.platform = INTEL_VALLEYVIEW,
274 	.gen = 7,
275 	.is_lp = 1,
276 	.num_pipes = 2,
277 	.has_psr = 1,
278 	.has_runtime_pm = 1,
279 	.has_rc6 = 1,
280 	.has_gmbus_irq = 1,
281 	.has_gmch_display = 1,
282 	.has_hotplug = 1,
283 	.has_aliasing_ppgtt = 1,
284 	.has_full_ppgtt = 1,
285 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING,
286 	.display_mmio_offset = VLV_DISPLAY_BASE,
287 	GEN_DEFAULT_PIPEOFFSETS,
288 	CURSOR_OFFSETS
289 };
290 
291 #define HSW_FEATURES  \
292 	GEN7_FEATURES, \
293 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING, \
294 	.has_ddi = 1, \
295 	.has_fpga_dbg = 1, \
296 	.has_psr = 1, \
297 	.has_resource_streamer = 1, \
298 	.has_dp_mst = 1, \
299 	.has_rc6p = 0 /* RC6p removed-by HSW */, \
300 	.has_runtime_pm = 1
301 
302 static const struct intel_device_info intel_haswell_info = {
303 	HSW_FEATURES,
304 	.platform = INTEL_HASWELL,
305 	.has_l3_dpf = 1,
306 };
307 
308 #define BDW_FEATURES \
309 	HSW_FEATURES, \
310 	BDW_COLORS, \
311 	.has_logical_ring_contexts = 1, \
312 	.has_full_48bit_ppgtt = 1, \
313 	.has_64bit_reloc = 1
314 
315 #define BDW_PLATFORM \
316 	BDW_FEATURES, \
317 	.gen = 8, \
318 	.platform = INTEL_BROADWELL
319 
320 static const struct intel_device_info intel_broadwell_info = {
321 	BDW_PLATFORM,
322 };
323 
324 static const struct intel_device_info intel_broadwell_gt3_info = {
325 	BDW_PLATFORM,
326 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING | BSD2_RING,
327 };
328 
329 static const struct intel_device_info intel_cherryview_info = {
330 	.gen = 8, .num_pipes = 3,
331 	.has_hotplug = 1,
332 	.is_lp = 1,
333 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING,
334 	.platform = INTEL_CHERRYVIEW,
335 	.has_64bit_reloc = 1,
336 	.has_psr = 1,
337 	.has_runtime_pm = 1,
338 	.has_resource_streamer = 1,
339 	.has_rc6 = 1,
340 	.has_gmbus_irq = 1,
341 	.has_logical_ring_contexts = 1,
342 	.has_gmch_display = 1,
343 	.has_aliasing_ppgtt = 1,
344 	.has_full_ppgtt = 1,
345 	.display_mmio_offset = VLV_DISPLAY_BASE,
346 	GEN_CHV_PIPEOFFSETS,
347 	CURSOR_OFFSETS,
348 	CHV_COLORS,
349 };
350 
351 #define SKL_PLATFORM \
352 	BDW_FEATURES, \
353 	.gen = 9, \
354 	.platform = INTEL_SKYLAKE, \
355 	.has_csr = 1, \
356 	.has_guc = 1, \
357 	.ddb_size = 896
358 
359 static const struct intel_device_info intel_skylake_info = {
360 	SKL_PLATFORM,
361 };
362 
363 static const struct intel_device_info intel_skylake_gt3_info = {
364 	SKL_PLATFORM,
365 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING | BSD2_RING,
366 };
367 
368 #define GEN9_LP_FEATURES \
369 	.gen = 9, \
370 	.is_lp = 1, \
371 	.has_hotplug = 1, \
372 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING, \
373 	.num_pipes = 3, \
374 	.has_64bit_reloc = 1, \
375 	.has_ddi = 1, \
376 	.has_fpga_dbg = 1, \
377 	.has_fbc = 1, \
378 	.has_runtime_pm = 1, \
379 	.has_pooled_eu = 0, \
380 	.has_csr = 1, \
381 	.has_resource_streamer = 1, \
382 	.has_rc6 = 1, \
383 	.has_dp_mst = 1, \
384 	.has_gmbus_irq = 1, \
385 	.has_logical_ring_contexts = 1, \
386 	.has_guc = 1, \
387 	.has_aliasing_ppgtt = 1, \
388 	.has_full_ppgtt = 1, \
389 	.has_full_48bit_ppgtt = 1, \
390 	GEN_DEFAULT_PIPEOFFSETS, \
391 	IVB_CURSOR_OFFSETS, \
392 	BDW_COLORS
393 
394 static const struct intel_device_info intel_broxton_info = {
395 	GEN9_LP_FEATURES,
396 	.platform = INTEL_BROXTON,
397 	.ddb_size = 512,
398 };
399 
400 static const struct intel_device_info intel_geminilake_info = {
401 	GEN9_LP_FEATURES,
402 	.platform = INTEL_GEMINILAKE,
403 	.ddb_size = 1024,
404 	.color = { .degamma_lut_size = 0, .gamma_lut_size = 1024 }
405 };
406 
407 #define KBL_PLATFORM \
408 	BDW_FEATURES, \
409 	.gen = 9, \
410 	.platform = INTEL_KABYLAKE, \
411 	.has_csr = 1, \
412 	.has_guc = 1, \
413 	.ddb_size = 896
414 
415 static const struct intel_device_info intel_kabylake_info = {
416 	KBL_PLATFORM,
417 };
418 
419 static const struct intel_device_info intel_kabylake_gt3_info = {
420 	KBL_PLATFORM,
421 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING | BSD2_RING,
422 };
423 
424 #define CFL_PLATFORM \
425 	.is_alpha_support = 1, \
426 	BDW_FEATURES, \
427 	.gen = 9, \
428 	.platform = INTEL_COFFEELAKE, \
429 	.has_csr = 1, \
430 	.has_guc = 1, \
431 	.ddb_size = 896
432 
433 static const struct intel_device_info intel_coffeelake_info = {
434 	CFL_PLATFORM,
435 };
436 
437 static const struct intel_device_info intel_coffeelake_gt3_info = {
438 	CFL_PLATFORM,
439 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING | BSD2_RING,
440 };
441 
442 static const struct intel_device_info intel_cannonlake_info = {
443 	BDW_FEATURES,
444 	.is_alpha_support = 1,
445 	.platform = INTEL_CANNONLAKE,
446 	.gen = 10,
447 	.ddb_size = 1024,
448 	.has_csr = 1,
449 };
450 
451 /*
452  * Make sure any device matches here are from most specific to most
453  * general.  For example, since the Quanta match is based on the subsystem
454  * and subvendor IDs, we need it to come before the more general IVB
455  * PCI ID matches, otherwise we'll use the wrong info struct above.
456  */
457 static const struct pci_device_id pciidlist[] = {
458 	INTEL_I830_IDS(&intel_i830_info),
459 	INTEL_I845G_IDS(&intel_i845g_info),
460 	INTEL_I85X_IDS(&intel_i85x_info),
461 	INTEL_I865G_IDS(&intel_i865g_info),
462 	INTEL_I915G_IDS(&intel_i915g_info),
463 	INTEL_I915GM_IDS(&intel_i915gm_info),
464 	INTEL_I945G_IDS(&intel_i945g_info),
465 	INTEL_I945GM_IDS(&intel_i945gm_info),
466 	INTEL_I965G_IDS(&intel_i965g_info),
467 	INTEL_G33_IDS(&intel_g33_info),
468 	INTEL_I965GM_IDS(&intel_i965gm_info),
469 	INTEL_GM45_IDS(&intel_gm45_info),
470 	INTEL_G45_IDS(&intel_g45_info),
471 	INTEL_PINEVIEW_IDS(&intel_pineview_info),
472 	INTEL_IRONLAKE_D_IDS(&intel_ironlake_d_info),
473 	INTEL_IRONLAKE_M_IDS(&intel_ironlake_m_info),
474 	INTEL_SNB_D_IDS(&intel_sandybridge_d_info),
475 	INTEL_SNB_M_IDS(&intel_sandybridge_m_info),
476 	INTEL_IVB_Q_IDS(&intel_ivybridge_q_info), /* must be first IVB */
477 	INTEL_IVB_M_IDS(&intel_ivybridge_m_info),
478 	INTEL_IVB_D_IDS(&intel_ivybridge_d_info),
479 	INTEL_HSW_IDS(&intel_haswell_info),
480 	INTEL_VLV_IDS(&intel_valleyview_info),
481 	INTEL_BDW_GT12_IDS(&intel_broadwell_info),
482 	INTEL_BDW_GT3_IDS(&intel_broadwell_gt3_info),
483 	INTEL_BDW_RSVD_IDS(&intel_broadwell_info),
484 	INTEL_CHV_IDS(&intel_cherryview_info),
485 	INTEL_SKL_GT1_IDS(&intel_skylake_info),
486 	INTEL_SKL_GT2_IDS(&intel_skylake_info),
487 	INTEL_SKL_GT3_IDS(&intel_skylake_gt3_info),
488 	INTEL_SKL_GT4_IDS(&intel_skylake_gt3_info),
489 	INTEL_BXT_IDS(&intel_broxton_info),
490 	INTEL_GLK_IDS(&intel_geminilake_info),
491 	INTEL_KBL_GT1_IDS(&intel_kabylake_info),
492 	INTEL_KBL_GT2_IDS(&intel_kabylake_info),
493 	INTEL_KBL_GT3_IDS(&intel_kabylake_gt3_info),
494 	INTEL_KBL_GT4_IDS(&intel_kabylake_gt3_info),
495 	INTEL_CFL_S_IDS(&intel_coffeelake_info),
496 	INTEL_CFL_H_IDS(&intel_coffeelake_info),
497 	INTEL_CFL_U_IDS(&intel_coffeelake_gt3_info),
498 	INTEL_CNL_IDS(&intel_cannonlake_info),
499 	{0, 0, 0}
500 };
501 MODULE_DEVICE_TABLE(pci, pciidlist);
502 
503 static void i915_pci_remove(struct pci_dev *pdev)
504 {
505 	struct drm_device *dev = pci_get_drvdata(pdev);
506 
507 	i915_driver_unload(dev);
508 	drm_dev_unref(dev);
509 }
510 
511 static int i915_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
512 {
513 	struct intel_device_info *intel_info =
514 		(struct intel_device_info *) ent->driver_data;
515 	int err;
516 
517 	if (IS_ALPHA_SUPPORT(intel_info) && !i915.alpha_support) {
518 		DRM_INFO("The driver support for your hardware in this kernel version is alpha quality\n"
519 			 "See CONFIG_DRM_I915_ALPHA_SUPPORT or i915.alpha_support module parameter\n"
520 			 "to enable support in this kernel version, or check for kernel updates.\n");
521 		return -ENODEV;
522 	}
523 
524 	/* Only bind to function 0 of the device. Early generations
525 	 * used function 1 as a placeholder for multi-head. This causes
526 	 * us confusion instead, especially on the systems where both
527 	 * functions have the same PCI-ID!
528 	 */
529 	if (PCI_FUNC(pdev->devfn))
530 		return -ENODEV;
531 
532 	/*
533 	 * apple-gmux is needed on dual GPU MacBook Pro
534 	 * to probe the panel if we're the inactive GPU.
535 	 */
536 	if (vga_switcheroo_client_probe_defer(pdev))
537 		return -EPROBE_DEFER;
538 
539 	err = i915_driver_load(pdev, ent);
540 	if (err)
541 		return err;
542 
543 	err = i915_live_selftests(pdev);
544 	if (err) {
545 		i915_pci_remove(pdev);
546 		return err > 0 ? -ENOTTY : err;
547 	}
548 
549 	return 0;
550 }
551 
552 static struct pci_driver i915_pci_driver = {
553 	.name = DRIVER_NAME,
554 	.id_table = pciidlist,
555 	.probe = i915_pci_probe,
556 	.remove = i915_pci_remove,
557 	.driver.pm = &i915_pm_ops,
558 };
559 
560 static int __init i915_init(void)
561 {
562 	bool use_kms = true;
563 	int err;
564 
565 	err = i915_mock_selftests();
566 	if (err)
567 		return err > 0 ? 0 : err;
568 
569 	/*
570 	 * Enable KMS by default, unless explicitly overriden by
571 	 * either the i915.modeset prarameter or by the
572 	 * vga_text_mode_force boot option.
573 	 */
574 
575 	if (i915.modeset == 0)
576 		use_kms = false;
577 
578 	if (vgacon_text_force() && i915.modeset == -1)
579 		use_kms = false;
580 
581 	if (!use_kms) {
582 		/* Silently fail loading to not upset userspace. */
583 		DRM_DEBUG_DRIVER("KMS disabled.\n");
584 		return 0;
585 	}
586 
587 	return pci_register_driver(&i915_pci_driver);
588 }
589 
590 static void __exit i915_exit(void)
591 {
592 	if (!i915_pci_driver.driver.owner)
593 		return;
594 
595 	pci_unregister_driver(&i915_pci_driver);
596 }
597 
598 module_init(i915_init);
599 module_exit(i915_exit);
600 
601 MODULE_AUTHOR("Tungsten Graphics, Inc.");
602 MODULE_AUTHOR("Intel Corporation");
603 
604 MODULE_DESCRIPTION(DRIVER_DESC);
605 MODULE_LICENSE("GPL and additional rights");
606