1 /*
2  * Copyright 2008 Advanced Micro Devices, Inc.
3  * Copyright 2008 Red Hat Inc.
4  * Copyright 2009 Jerome Glisse.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the "Software"),
8  * to deal in the Software without restriction, including without limitation
9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10  * and/or sell copies of the Software, and to permit persons to whom the
11  * Software is furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22  * OTHER DEALINGS IN THE SOFTWARE.
23  *
24  * Authors: Dave Airlie
25  *          Alex Deucher
26  *          Jerome Glisse
27  */
28 
29 #include <linux/console.h>
30 #include <linux/efi.h>
31 #include <linux/pci.h>
32 #include <linux/pm_runtime.h>
33 #include <linux/slab.h>
34 #include <linux/vga_switcheroo.h>
35 #include <linux/vgaarb.h>
36 
37 #include <drm/drm_cache.h>
38 #include <drm/drm_crtc_helper.h>
39 #include <drm/drm_device.h>
40 #include <drm/drm_file.h>
41 #include <drm/drm_framebuffer.h>
42 #include <drm/drm_probe_helper.h>
43 #include <drm/radeon_drm.h>
44 
45 #include "radeon_device.h"
46 #include "radeon_reg.h"
47 #include "radeon.h"
48 #include "atom.h"
49 
50 static const char radeon_family_name[][16] = {
51 	"R100",
52 	"RV100",
53 	"RS100",
54 	"RV200",
55 	"RS200",
56 	"R200",
57 	"RV250",
58 	"RS300",
59 	"RV280",
60 	"R300",
61 	"R350",
62 	"RV350",
63 	"RV380",
64 	"R420",
65 	"R423",
66 	"RV410",
67 	"RS400",
68 	"RS480",
69 	"RS600",
70 	"RS690",
71 	"RS740",
72 	"RV515",
73 	"R520",
74 	"RV530",
75 	"RV560",
76 	"RV570",
77 	"R580",
78 	"R600",
79 	"RV610",
80 	"RV630",
81 	"RV670",
82 	"RV620",
83 	"RV635",
84 	"RS780",
85 	"RS880",
86 	"RV770",
87 	"RV730",
88 	"RV710",
89 	"RV740",
90 	"CEDAR",
91 	"REDWOOD",
92 	"JUNIPER",
93 	"CYPRESS",
94 	"HEMLOCK",
95 	"PALM",
96 	"SUMO",
97 	"SUMO2",
98 	"BARTS",
99 	"TURKS",
100 	"CAICOS",
101 	"CAYMAN",
102 	"ARUBA",
103 	"TAHITI",
104 	"PITCAIRN",
105 	"VERDE",
106 	"OLAND",
107 	"HAINAN",
108 	"BONAIRE",
109 	"KAVERI",
110 	"KABINI",
111 	"HAWAII",
112 	"MULLINS",
113 	"LAST",
114 };
115 
116 #if defined(CONFIG_VGA_SWITCHEROO)
117 bool radeon_has_atpx_dgpu_power_cntl(void);
118 bool radeon_is_atpx_hybrid(void);
119 #else
120 static inline bool radeon_has_atpx_dgpu_power_cntl(void) { return false; }
121 static inline bool radeon_is_atpx_hybrid(void) { return false; }
122 #endif
123 
124 #define RADEON_PX_QUIRK_DISABLE_PX  (1 << 0)
125 
126 struct radeon_px_quirk {
127 	u32 chip_vendor;
128 	u32 chip_device;
129 	u32 subsys_vendor;
130 	u32 subsys_device;
131 	u32 px_quirk_flags;
132 };
133 
134 static struct radeon_px_quirk radeon_px_quirk_list[] = {
135 	/* Acer aspire 5560g (CPU: AMD A4-3305M; GPU: AMD Radeon HD 6480g + 7470m)
136 	 * https://bugzilla.kernel.org/show_bug.cgi?id=74551
137 	 */
138 	{ PCI_VENDOR_ID_ATI, 0x6760, 0x1025, 0x0672, RADEON_PX_QUIRK_DISABLE_PX },
139 	/* Asus K73TA laptop with AMD A6-3400M APU and Radeon 6550 GPU
140 	 * https://bugzilla.kernel.org/show_bug.cgi?id=51381
141 	 */
142 	{ PCI_VENDOR_ID_ATI, 0x6741, 0x1043, 0x108c, RADEON_PX_QUIRK_DISABLE_PX },
143 	/* Asus K53TK laptop with AMD A6-3420M APU and Radeon 7670m GPU
144 	 * https://bugzilla.kernel.org/show_bug.cgi?id=51381
145 	 */
146 	{ PCI_VENDOR_ID_ATI, 0x6840, 0x1043, 0x2122, RADEON_PX_QUIRK_DISABLE_PX },
147 	/* Asus K53TK laptop with AMD A6-3420M APU and Radeon 7670m GPU
148 	 * https://bugs.freedesktop.org/show_bug.cgi?id=101491
149 	 */
150 	{ PCI_VENDOR_ID_ATI, 0x6741, 0x1043, 0x2122, RADEON_PX_QUIRK_DISABLE_PX },
151 	/* Asus K73TK laptop with AMD A6-3420M APU and Radeon 7670m GPU
152 	 * https://bugzilla.kernel.org/show_bug.cgi?id=51381#c52
153 	 */
154 	{ PCI_VENDOR_ID_ATI, 0x6840, 0x1043, 0x2123, RADEON_PX_QUIRK_DISABLE_PX },
155 	{ 0, 0, 0, 0, 0 },
156 };
157 
158 bool radeon_is_px(struct drm_device *dev)
159 {
160 	struct radeon_device *rdev = dev->dev_private;
161 
162 	if (rdev->flags & RADEON_IS_PX)
163 		return true;
164 	return false;
165 }
166 
167 static void radeon_device_handle_px_quirks(struct radeon_device *rdev)
168 {
169 	struct radeon_px_quirk *p = radeon_px_quirk_list;
170 
171 	/* Apply PX quirks */
172 	while (p && p->chip_device != 0) {
173 		if (rdev->pdev->vendor == p->chip_vendor &&
174 		    rdev->pdev->device == p->chip_device &&
175 		    rdev->pdev->subsystem_vendor == p->subsys_vendor &&
176 		    rdev->pdev->subsystem_device == p->subsys_device) {
177 			rdev->px_quirk_flags = p->px_quirk_flags;
178 			break;
179 		}
180 		++p;
181 	}
182 
183 	if (rdev->px_quirk_flags & RADEON_PX_QUIRK_DISABLE_PX)
184 		rdev->flags &= ~RADEON_IS_PX;
185 
186 	/* disable PX is the system doesn't support dGPU power control or hybrid gfx */
187 	if (!radeon_is_atpx_hybrid() &&
188 	    !radeon_has_atpx_dgpu_power_cntl())
189 		rdev->flags &= ~RADEON_IS_PX;
190 }
191 
192 /**
193  * radeon_program_register_sequence - program an array of registers.
194  *
195  * @rdev: radeon_device pointer
196  * @registers: pointer to the register array
197  * @array_size: size of the register array
198  *
199  * Programs an array or registers with and and or masks.
200  * This is a helper for setting golden registers.
201  */
202 void radeon_program_register_sequence(struct radeon_device *rdev,
203 				      const u32 *registers,
204 				      const u32 array_size)
205 {
206 	u32 tmp, reg, and_mask, or_mask;
207 	int i;
208 
209 	if (array_size % 3)
210 		return;
211 
212 	for (i = 0; i < array_size; i +=3) {
213 		reg = registers[i + 0];
214 		and_mask = registers[i + 1];
215 		or_mask = registers[i + 2];
216 
217 		if (and_mask == 0xffffffff) {
218 			tmp = or_mask;
219 		} else {
220 			tmp = RREG32(reg);
221 			tmp &= ~and_mask;
222 			tmp |= or_mask;
223 		}
224 		WREG32(reg, tmp);
225 	}
226 }
227 
228 void radeon_pci_config_reset(struct radeon_device *rdev)
229 {
230 	pci_write_config_dword(rdev->pdev, 0x7c, RADEON_ASIC_RESET_DATA);
231 }
232 
233 /**
234  * radeon_surface_init - Clear GPU surface registers.
235  *
236  * @rdev: radeon_device pointer
237  *
238  * Clear GPU surface registers (r1xx-r5xx).
239  */
240 void radeon_surface_init(struct radeon_device *rdev)
241 {
242 	/* FIXME: check this out */
243 	if (rdev->family < CHIP_R600) {
244 		int i;
245 
246 		for (i = 0; i < RADEON_GEM_MAX_SURFACES; i++) {
247 			if (rdev->surface_regs[i].bo)
248 				radeon_bo_get_surface_reg(rdev->surface_regs[i].bo);
249 			else
250 				radeon_clear_surface_reg(rdev, i);
251 		}
252 		/* enable surfaces */
253 		WREG32(RADEON_SURFACE_CNTL, 0);
254 	}
255 }
256 
257 /*
258  * GPU scratch registers helpers function.
259  */
260 /**
261  * radeon_scratch_init - Init scratch register driver information.
262  *
263  * @rdev: radeon_device pointer
264  *
265  * Init CP scratch register driver information (r1xx-r5xx)
266  */
267 void radeon_scratch_init(struct radeon_device *rdev)
268 {
269 	int i;
270 
271 	/* FIXME: check this out */
272 	if (rdev->family < CHIP_R300) {
273 		rdev->scratch.num_reg = 5;
274 	} else {
275 		rdev->scratch.num_reg = 7;
276 	}
277 	rdev->scratch.reg_base = RADEON_SCRATCH_REG0;
278 	for (i = 0; i < rdev->scratch.num_reg; i++) {
279 		rdev->scratch.free[i] = true;
280 		rdev->scratch.reg[i] = rdev->scratch.reg_base + (i * 4);
281 	}
282 }
283 
284 /**
285  * radeon_scratch_get - Allocate a scratch register
286  *
287  * @rdev: radeon_device pointer
288  * @reg: scratch register mmio offset
289  *
290  * Allocate a CP scratch register for use by the driver (all asics).
291  * Returns 0 on success or -EINVAL on failure.
292  */
293 int radeon_scratch_get(struct radeon_device *rdev, uint32_t *reg)
294 {
295 	int i;
296 
297 	for (i = 0; i < rdev->scratch.num_reg; i++) {
298 		if (rdev->scratch.free[i]) {
299 			rdev->scratch.free[i] = false;
300 			*reg = rdev->scratch.reg[i];
301 			return 0;
302 		}
303 	}
304 	return -EINVAL;
305 }
306 
307 /**
308  * radeon_scratch_free - Free a scratch register
309  *
310  * @rdev: radeon_device pointer
311  * @reg: scratch register mmio offset
312  *
313  * Free a CP scratch register allocated for use by the driver (all asics)
314  */
315 void radeon_scratch_free(struct radeon_device *rdev, uint32_t reg)
316 {
317 	int i;
318 
319 	for (i = 0; i < rdev->scratch.num_reg; i++) {
320 		if (rdev->scratch.reg[i] == reg) {
321 			rdev->scratch.free[i] = true;
322 			return;
323 		}
324 	}
325 }
326 
327 /*
328  * GPU doorbell aperture helpers function.
329  */
330 /**
331  * radeon_doorbell_init - Init doorbell driver information.
332  *
333  * @rdev: radeon_device pointer
334  *
335  * Init doorbell driver information (CIK)
336  * Returns 0 on success, error on failure.
337  */
338 static int radeon_doorbell_init(struct radeon_device *rdev)
339 {
340 	/* doorbell bar mapping */
341 	rdev->doorbell.base = pci_resource_start(rdev->pdev, 2);
342 	rdev->doorbell.size = pci_resource_len(rdev->pdev, 2);
343 
344 	rdev->doorbell.num_doorbells = min_t(u32, rdev->doorbell.size / sizeof(u32), RADEON_MAX_DOORBELLS);
345 	if (rdev->doorbell.num_doorbells == 0)
346 		return -EINVAL;
347 
348 	rdev->doorbell.ptr = ioremap(rdev->doorbell.base, rdev->doorbell.num_doorbells * sizeof(u32));
349 	if (rdev->doorbell.ptr == NULL) {
350 		return -ENOMEM;
351 	}
352 	DRM_INFO("doorbell mmio base: 0x%08X\n", (uint32_t)rdev->doorbell.base);
353 	DRM_INFO("doorbell mmio size: %u\n", (unsigned)rdev->doorbell.size);
354 
355 	memset(&rdev->doorbell.used, 0, sizeof(rdev->doorbell.used));
356 
357 	return 0;
358 }
359 
360 /**
361  * radeon_doorbell_fini - Tear down doorbell driver information.
362  *
363  * @rdev: radeon_device pointer
364  *
365  * Tear down doorbell driver information (CIK)
366  */
367 static void radeon_doorbell_fini(struct radeon_device *rdev)
368 {
369 	iounmap(rdev->doorbell.ptr);
370 	rdev->doorbell.ptr = NULL;
371 }
372 
373 /**
374  * radeon_doorbell_get - Allocate a doorbell entry
375  *
376  * @rdev: radeon_device pointer
377  * @doorbell: doorbell index
378  *
379  * Allocate a doorbell for use by the driver (all asics).
380  * Returns 0 on success or -EINVAL on failure.
381  */
382 int radeon_doorbell_get(struct radeon_device *rdev, u32 *doorbell)
383 {
384 	unsigned long offset = find_first_zero_bit(rdev->doorbell.used, rdev->doorbell.num_doorbells);
385 	if (offset < rdev->doorbell.num_doorbells) {
386 		__set_bit(offset, rdev->doorbell.used);
387 		*doorbell = offset;
388 		return 0;
389 	} else {
390 		return -EINVAL;
391 	}
392 }
393 
394 /**
395  * radeon_doorbell_free - Free a doorbell entry
396  *
397  * @rdev: radeon_device pointer
398  * @doorbell: doorbell index
399  *
400  * Free a doorbell allocated for use by the driver (all asics)
401  */
402 void radeon_doorbell_free(struct radeon_device *rdev, u32 doorbell)
403 {
404 	if (doorbell < rdev->doorbell.num_doorbells)
405 		__clear_bit(doorbell, rdev->doorbell.used);
406 }
407 
408 /*
409  * radeon_wb_*()
410  * Writeback is the method by which the GPU updates special pages
411  * in memory with the status of certain GPU events (fences, ring pointers,
412  * etc.).
413  */
414 
415 /**
416  * radeon_wb_disable - Disable Writeback
417  *
418  * @rdev: radeon_device pointer
419  *
420  * Disables Writeback (all asics).  Used for suspend.
421  */
422 void radeon_wb_disable(struct radeon_device *rdev)
423 {
424 	rdev->wb.enabled = false;
425 }
426 
427 /**
428  * radeon_wb_fini - Disable Writeback and free memory
429  *
430  * @rdev: radeon_device pointer
431  *
432  * Disables Writeback and frees the Writeback memory (all asics).
433  * Used at driver shutdown.
434  */
435 void radeon_wb_fini(struct radeon_device *rdev)
436 {
437 	radeon_wb_disable(rdev);
438 	if (rdev->wb.wb_obj) {
439 		if (!radeon_bo_reserve(rdev->wb.wb_obj, false)) {
440 			radeon_bo_kunmap(rdev->wb.wb_obj);
441 			radeon_bo_unpin(rdev->wb.wb_obj);
442 			radeon_bo_unreserve(rdev->wb.wb_obj);
443 		}
444 		radeon_bo_unref(&rdev->wb.wb_obj);
445 		rdev->wb.wb = NULL;
446 		rdev->wb.wb_obj = NULL;
447 	}
448 }
449 
450 /**
451  * radeon_wb_init- Init Writeback driver info and allocate memory
452  *
453  * @rdev: radeon_device pointer
454  *
455  * Disables Writeback and frees the Writeback memory (all asics).
456  * Used at driver startup.
457  * Returns 0 on success or an -error on failure.
458  */
459 int radeon_wb_init(struct radeon_device *rdev)
460 {
461 	int r;
462 
463 	if (rdev->wb.wb_obj == NULL) {
464 		r = radeon_bo_create(rdev, RADEON_GPU_PAGE_SIZE, PAGE_SIZE, true,
465 				     RADEON_GEM_DOMAIN_GTT, 0, NULL, NULL,
466 				     &rdev->wb.wb_obj);
467 		if (r) {
468 			dev_warn(rdev->dev, "(%d) create WB bo failed\n", r);
469 			return r;
470 		}
471 		r = radeon_bo_reserve(rdev->wb.wb_obj, false);
472 		if (unlikely(r != 0)) {
473 			radeon_wb_fini(rdev);
474 			return r;
475 		}
476 		r = radeon_bo_pin(rdev->wb.wb_obj, RADEON_GEM_DOMAIN_GTT,
477 				&rdev->wb.gpu_addr);
478 		if (r) {
479 			radeon_bo_unreserve(rdev->wb.wb_obj);
480 			dev_warn(rdev->dev, "(%d) pin WB bo failed\n", r);
481 			radeon_wb_fini(rdev);
482 			return r;
483 		}
484 		r = radeon_bo_kmap(rdev->wb.wb_obj, (void **)&rdev->wb.wb);
485 		radeon_bo_unreserve(rdev->wb.wb_obj);
486 		if (r) {
487 			dev_warn(rdev->dev, "(%d) map WB bo failed\n", r);
488 			radeon_wb_fini(rdev);
489 			return r;
490 		}
491 	}
492 
493 	/* clear wb memory */
494 	memset((char *)rdev->wb.wb, 0, RADEON_GPU_PAGE_SIZE);
495 	/* disable event_write fences */
496 	rdev->wb.use_event = false;
497 	/* disabled via module param */
498 	if (radeon_no_wb == 1) {
499 		rdev->wb.enabled = false;
500 	} else {
501 		if (rdev->flags & RADEON_IS_AGP) {
502 			/* often unreliable on AGP */
503 			rdev->wb.enabled = false;
504 		} else if (rdev->family < CHIP_R300) {
505 			/* often unreliable on pre-r300 */
506 			rdev->wb.enabled = false;
507 		} else {
508 			rdev->wb.enabled = true;
509 			/* event_write fences are only available on r600+ */
510 			if (rdev->family >= CHIP_R600) {
511 				rdev->wb.use_event = true;
512 			}
513 		}
514 	}
515 	/* always use writeback/events on NI, APUs */
516 	if (rdev->family >= CHIP_PALM) {
517 		rdev->wb.enabled = true;
518 		rdev->wb.use_event = true;
519 	}
520 
521 	dev_info(rdev->dev, "WB %sabled\n", rdev->wb.enabled ? "en" : "dis");
522 
523 	return 0;
524 }
525 
526 /**
527  * radeon_vram_location - try to find VRAM location
528  * @rdev: radeon device structure holding all necessary informations
529  * @mc: memory controller structure holding memory informations
530  * @base: base address at which to put VRAM
531  *
532  * Function will place try to place VRAM at base address provided
533  * as parameter (which is so far either PCI aperture address or
534  * for IGP TOM base address).
535  *
536  * If there is not enough space to fit the unvisible VRAM in the 32bits
537  * address space then we limit the VRAM size to the aperture.
538  *
539  * If we are using AGP and if the AGP aperture doesn't allow us to have
540  * room for all the VRAM than we restrict the VRAM to the PCI aperture
541  * size and print a warning.
542  *
543  * This function will never fails, worst case are limiting VRAM.
544  *
545  * Note: GTT start, end, size should be initialized before calling this
546  * function on AGP platform.
547  *
548  * Note 1: We don't explicitly enforce VRAM start to be aligned on VRAM size,
549  * this shouldn't be a problem as we are using the PCI aperture as a reference.
550  * Otherwise this would be needed for rv280, all r3xx, and all r4xx, but
551  * not IGP.
552  *
553  * Note 2: we use mc_vram_size as on some board we need to program the mc to
554  * cover the whole aperture even if VRAM size is inferior to aperture size
555  * Novell bug 204882 + along with lots of ubuntu ones
556  *
557  * Note 3: when limiting vram it's safe to overwritte real_vram_size because
558  * we are not in case where real_vram_size is inferior to mc_vram_size (ie
559  * note afected by bogus hw of Novell bug 204882 + along with lots of ubuntu
560  * ones)
561  *
562  * Note 4: IGP TOM addr should be the same as the aperture addr, we don't
563  * explicitly check for that thought.
564  *
565  * FIXME: when reducing VRAM size align new size on power of 2.
566  */
567 void radeon_vram_location(struct radeon_device *rdev, struct radeon_mc *mc, u64 base)
568 {
569 	uint64_t limit = (uint64_t)radeon_vram_limit << 20;
570 
571 	mc->vram_start = base;
572 	if (mc->mc_vram_size > (rdev->mc.mc_mask - base + 1)) {
573 		dev_warn(rdev->dev, "limiting VRAM to PCI aperture size\n");
574 		mc->real_vram_size = mc->aper_size;
575 		mc->mc_vram_size = mc->aper_size;
576 	}
577 	mc->vram_end = mc->vram_start + mc->mc_vram_size - 1;
578 	if (rdev->flags & RADEON_IS_AGP && mc->vram_end > mc->gtt_start && mc->vram_start <= mc->gtt_end) {
579 		dev_warn(rdev->dev, "limiting VRAM to PCI aperture size\n");
580 		mc->real_vram_size = mc->aper_size;
581 		mc->mc_vram_size = mc->aper_size;
582 	}
583 	mc->vram_end = mc->vram_start + mc->mc_vram_size - 1;
584 	if (limit && limit < mc->real_vram_size)
585 		mc->real_vram_size = limit;
586 	dev_info(rdev->dev, "VRAM: %lluM 0x%016llX - 0x%016llX (%lluM used)\n",
587 			mc->mc_vram_size >> 20, mc->vram_start,
588 			mc->vram_end, mc->real_vram_size >> 20);
589 }
590 
591 /**
592  * radeon_gtt_location - try to find GTT location
593  * @rdev: radeon device structure holding all necessary informations
594  * @mc: memory controller structure holding memory informations
595  *
596  * Function will place try to place GTT before or after VRAM.
597  *
598  * If GTT size is bigger than space left then we ajust GTT size.
599  * Thus function will never fails.
600  *
601  * FIXME: when reducing GTT size align new size on power of 2.
602  */
603 void radeon_gtt_location(struct radeon_device *rdev, struct radeon_mc *mc)
604 {
605 	u64 size_af, size_bf;
606 
607 	size_af = ((rdev->mc.mc_mask - mc->vram_end) + mc->gtt_base_align) & ~mc->gtt_base_align;
608 	size_bf = mc->vram_start & ~mc->gtt_base_align;
609 	if (size_bf > size_af) {
610 		if (mc->gtt_size > size_bf) {
611 			dev_warn(rdev->dev, "limiting GTT\n");
612 			mc->gtt_size = size_bf;
613 		}
614 		mc->gtt_start = (mc->vram_start & ~mc->gtt_base_align) - mc->gtt_size;
615 	} else {
616 		if (mc->gtt_size > size_af) {
617 			dev_warn(rdev->dev, "limiting GTT\n");
618 			mc->gtt_size = size_af;
619 		}
620 		mc->gtt_start = (mc->vram_end + 1 + mc->gtt_base_align) & ~mc->gtt_base_align;
621 	}
622 	mc->gtt_end = mc->gtt_start + mc->gtt_size - 1;
623 	dev_info(rdev->dev, "GTT: %lluM 0x%016llX - 0x%016llX\n",
624 			mc->gtt_size >> 20, mc->gtt_start, mc->gtt_end);
625 }
626 
627 /*
628  * GPU helpers function.
629  */
630 
631 /*
632  * radeon_device_is_virtual - check if we are running is a virtual environment
633  *
634  * Check if the asic has been passed through to a VM (all asics).
635  * Used at driver startup.
636  * Returns true if virtual or false if not.
637  */
638 bool radeon_device_is_virtual(void)
639 {
640 #ifdef CONFIG_X86
641 	return boot_cpu_has(X86_FEATURE_HYPERVISOR);
642 #else
643 	return false;
644 #endif
645 }
646 
647 /**
648  * radeon_card_posted - check if the hw has already been initialized
649  *
650  * @rdev: radeon_device pointer
651  *
652  * Check if the asic has been initialized (all asics).
653  * Used at driver startup.
654  * Returns true if initialized or false if not.
655  */
656 bool radeon_card_posted(struct radeon_device *rdev)
657 {
658 	uint32_t reg;
659 
660 	/* for pass through, always force asic_init for CI */
661 	if (rdev->family >= CHIP_BONAIRE &&
662 	    radeon_device_is_virtual())
663 		return false;
664 
665 	/* required for EFI mode on macbook2,1 which uses an r5xx asic */
666 	if (efi_enabled(EFI_BOOT) &&
667 	    (rdev->pdev->subsystem_vendor == PCI_VENDOR_ID_APPLE) &&
668 	    (rdev->family < CHIP_R600))
669 		return false;
670 
671 	if (ASIC_IS_NODCE(rdev))
672 		goto check_memsize;
673 
674 	/* first check CRTCs */
675 	if (ASIC_IS_DCE4(rdev)) {
676 		reg = RREG32(EVERGREEN_CRTC_CONTROL + EVERGREEN_CRTC0_REGISTER_OFFSET) |
677 			RREG32(EVERGREEN_CRTC_CONTROL + EVERGREEN_CRTC1_REGISTER_OFFSET);
678 			if (rdev->num_crtc >= 4) {
679 				reg |= RREG32(EVERGREEN_CRTC_CONTROL + EVERGREEN_CRTC2_REGISTER_OFFSET) |
680 					RREG32(EVERGREEN_CRTC_CONTROL + EVERGREEN_CRTC3_REGISTER_OFFSET);
681 			}
682 			if (rdev->num_crtc >= 6) {
683 				reg |= RREG32(EVERGREEN_CRTC_CONTROL + EVERGREEN_CRTC4_REGISTER_OFFSET) |
684 					RREG32(EVERGREEN_CRTC_CONTROL + EVERGREEN_CRTC5_REGISTER_OFFSET);
685 			}
686 		if (reg & EVERGREEN_CRTC_MASTER_EN)
687 			return true;
688 	} else if (ASIC_IS_AVIVO(rdev)) {
689 		reg = RREG32(AVIVO_D1CRTC_CONTROL) |
690 		      RREG32(AVIVO_D2CRTC_CONTROL);
691 		if (reg & AVIVO_CRTC_EN) {
692 			return true;
693 		}
694 	} else {
695 		reg = RREG32(RADEON_CRTC_GEN_CNTL) |
696 		      RREG32(RADEON_CRTC2_GEN_CNTL);
697 		if (reg & RADEON_CRTC_EN) {
698 			return true;
699 		}
700 	}
701 
702 check_memsize:
703 	/* then check MEM_SIZE, in case the crtcs are off */
704 	if (rdev->family >= CHIP_R600)
705 		reg = RREG32(R600_CONFIG_MEMSIZE);
706 	else
707 		reg = RREG32(RADEON_CONFIG_MEMSIZE);
708 
709 	if (reg)
710 		return true;
711 
712 	return false;
713 
714 }
715 
716 /**
717  * radeon_update_bandwidth_info - update display bandwidth params
718  *
719  * @rdev: radeon_device pointer
720  *
721  * Used when sclk/mclk are switched or display modes are set.
722  * params are used to calculate display watermarks (all asics)
723  */
724 void radeon_update_bandwidth_info(struct radeon_device *rdev)
725 {
726 	fixed20_12 a;
727 	u32 sclk = rdev->pm.current_sclk;
728 	u32 mclk = rdev->pm.current_mclk;
729 
730 	/* sclk/mclk in Mhz */
731 	a.full = dfixed_const(100);
732 	rdev->pm.sclk.full = dfixed_const(sclk);
733 	rdev->pm.sclk.full = dfixed_div(rdev->pm.sclk, a);
734 	rdev->pm.mclk.full = dfixed_const(mclk);
735 	rdev->pm.mclk.full = dfixed_div(rdev->pm.mclk, a);
736 
737 	if (rdev->flags & RADEON_IS_IGP) {
738 		a.full = dfixed_const(16);
739 		/* core_bandwidth = sclk(Mhz) * 16 */
740 		rdev->pm.core_bandwidth.full = dfixed_div(rdev->pm.sclk, a);
741 	}
742 }
743 
744 /**
745  * radeon_boot_test_post_card - check and possibly initialize the hw
746  *
747  * @rdev: radeon_device pointer
748  *
749  * Check if the asic is initialized and if not, attempt to initialize
750  * it (all asics).
751  * Returns true if initialized or false if not.
752  */
753 bool radeon_boot_test_post_card(struct radeon_device *rdev)
754 {
755 	if (radeon_card_posted(rdev))
756 		return true;
757 
758 	if (rdev->bios) {
759 		DRM_INFO("GPU not posted. posting now...\n");
760 		if (rdev->is_atom_bios)
761 			atom_asic_init(rdev->mode_info.atom_context);
762 		else
763 			radeon_combios_asic_init(rdev->ddev);
764 		return true;
765 	} else {
766 		dev_err(rdev->dev, "Card not posted and no BIOS - ignoring\n");
767 		return false;
768 	}
769 }
770 
771 /**
772  * radeon_dummy_page_init - init dummy page used by the driver
773  *
774  * @rdev: radeon_device pointer
775  *
776  * Allocate the dummy page used by the driver (all asics).
777  * This dummy page is used by the driver as a filler for gart entries
778  * when pages are taken out of the GART
779  * Returns 0 on sucess, -ENOMEM on failure.
780  */
781 int radeon_dummy_page_init(struct radeon_device *rdev)
782 {
783 	if (rdev->dummy_page.page)
784 		return 0;
785 	rdev->dummy_page.page = alloc_page(GFP_DMA32 | GFP_KERNEL | __GFP_ZERO);
786 	if (rdev->dummy_page.page == NULL)
787 		return -ENOMEM;
788 	rdev->dummy_page.addr = dma_map_page(&rdev->pdev->dev, rdev->dummy_page.page,
789 					0, PAGE_SIZE, DMA_BIDIRECTIONAL);
790 	if (dma_mapping_error(&rdev->pdev->dev, rdev->dummy_page.addr)) {
791 		dev_err(&rdev->pdev->dev, "Failed to DMA MAP the dummy page\n");
792 		__free_page(rdev->dummy_page.page);
793 		rdev->dummy_page.page = NULL;
794 		return -ENOMEM;
795 	}
796 	rdev->dummy_page.entry = radeon_gart_get_page_entry(rdev->dummy_page.addr,
797 							    RADEON_GART_PAGE_DUMMY);
798 	return 0;
799 }
800 
801 /**
802  * radeon_dummy_page_fini - free dummy page used by the driver
803  *
804  * @rdev: radeon_device pointer
805  *
806  * Frees the dummy page used by the driver (all asics).
807  */
808 void radeon_dummy_page_fini(struct radeon_device *rdev)
809 {
810 	if (rdev->dummy_page.page == NULL)
811 		return;
812 	dma_unmap_page(&rdev->pdev->dev, rdev->dummy_page.addr, PAGE_SIZE,
813 		       DMA_BIDIRECTIONAL);
814 	__free_page(rdev->dummy_page.page);
815 	rdev->dummy_page.page = NULL;
816 }
817 
818 
819 /* ATOM accessor methods */
820 /*
821  * ATOM is an interpreted byte code stored in tables in the vbios.  The
822  * driver registers callbacks to access registers and the interpreter
823  * in the driver parses the tables and executes then to program specific
824  * actions (set display modes, asic init, etc.).  See radeon_atombios.c,
825  * atombios.h, and atom.c
826  */
827 
828 /**
829  * cail_pll_read - read PLL register
830  *
831  * @info: atom card_info pointer
832  * @reg: PLL register offset
833  *
834  * Provides a PLL register accessor for the atom interpreter (r4xx+).
835  * Returns the value of the PLL register.
836  */
837 static uint32_t cail_pll_read(struct card_info *info, uint32_t reg)
838 {
839 	struct radeon_device *rdev = info->dev->dev_private;
840 	uint32_t r;
841 
842 	r = rdev->pll_rreg(rdev, reg);
843 	return r;
844 }
845 
846 /**
847  * cail_pll_write - write PLL register
848  *
849  * @info: atom card_info pointer
850  * @reg: PLL register offset
851  * @val: value to write to the pll register
852  *
853  * Provides a PLL register accessor for the atom interpreter (r4xx+).
854  */
855 static void cail_pll_write(struct card_info *info, uint32_t reg, uint32_t val)
856 {
857 	struct radeon_device *rdev = info->dev->dev_private;
858 
859 	rdev->pll_wreg(rdev, reg, val);
860 }
861 
862 /**
863  * cail_mc_read - read MC (Memory Controller) register
864  *
865  * @info: atom card_info pointer
866  * @reg: MC register offset
867  *
868  * Provides an MC register accessor for the atom interpreter (r4xx+).
869  * Returns the value of the MC register.
870  */
871 static uint32_t cail_mc_read(struct card_info *info, uint32_t reg)
872 {
873 	struct radeon_device *rdev = info->dev->dev_private;
874 	uint32_t r;
875 
876 	r = rdev->mc_rreg(rdev, reg);
877 	return r;
878 }
879 
880 /**
881  * cail_mc_write - write MC (Memory Controller) register
882  *
883  * @info: atom card_info pointer
884  * @reg: MC register offset
885  * @val: value to write to the pll register
886  *
887  * Provides a MC register accessor for the atom interpreter (r4xx+).
888  */
889 static void cail_mc_write(struct card_info *info, uint32_t reg, uint32_t val)
890 {
891 	struct radeon_device *rdev = info->dev->dev_private;
892 
893 	rdev->mc_wreg(rdev, reg, val);
894 }
895 
896 /**
897  * cail_reg_write - write MMIO register
898  *
899  * @info: atom card_info pointer
900  * @reg: MMIO register offset
901  * @val: value to write to the pll register
902  *
903  * Provides a MMIO register accessor for the atom interpreter (r4xx+).
904  */
905 static void cail_reg_write(struct card_info *info, uint32_t reg, uint32_t val)
906 {
907 	struct radeon_device *rdev = info->dev->dev_private;
908 
909 	WREG32(reg*4, val);
910 }
911 
912 /**
913  * cail_reg_read - read MMIO register
914  *
915  * @info: atom card_info pointer
916  * @reg: MMIO register offset
917  *
918  * Provides an MMIO register accessor for the atom interpreter (r4xx+).
919  * Returns the value of the MMIO register.
920  */
921 static uint32_t cail_reg_read(struct card_info *info, uint32_t reg)
922 {
923 	struct radeon_device *rdev = info->dev->dev_private;
924 	uint32_t r;
925 
926 	r = RREG32(reg*4);
927 	return r;
928 }
929 
930 /**
931  * cail_ioreg_write - write IO register
932  *
933  * @info: atom card_info pointer
934  * @reg: IO register offset
935  * @val: value to write to the pll register
936  *
937  * Provides a IO register accessor for the atom interpreter (r4xx+).
938  */
939 static void cail_ioreg_write(struct card_info *info, uint32_t reg, uint32_t val)
940 {
941 	struct radeon_device *rdev = info->dev->dev_private;
942 
943 	WREG32_IO(reg*4, val);
944 }
945 
946 /**
947  * cail_ioreg_read - read IO register
948  *
949  * @info: atom card_info pointer
950  * @reg: IO register offset
951  *
952  * Provides an IO register accessor for the atom interpreter (r4xx+).
953  * Returns the value of the IO register.
954  */
955 static uint32_t cail_ioreg_read(struct card_info *info, uint32_t reg)
956 {
957 	struct radeon_device *rdev = info->dev->dev_private;
958 	uint32_t r;
959 
960 	r = RREG32_IO(reg*4);
961 	return r;
962 }
963 
964 /**
965  * radeon_atombios_init - init the driver info and callbacks for atombios
966  *
967  * @rdev: radeon_device pointer
968  *
969  * Initializes the driver info and register access callbacks for the
970  * ATOM interpreter (r4xx+).
971  * Returns 0 on sucess, -ENOMEM on failure.
972  * Called at driver startup.
973  */
974 int radeon_atombios_init(struct radeon_device *rdev)
975 {
976 	struct card_info *atom_card_info =
977 	    kzalloc(sizeof(struct card_info), GFP_KERNEL);
978 
979 	if (!atom_card_info)
980 		return -ENOMEM;
981 
982 	rdev->mode_info.atom_card_info = atom_card_info;
983 	atom_card_info->dev = rdev->ddev;
984 	atom_card_info->reg_read = cail_reg_read;
985 	atom_card_info->reg_write = cail_reg_write;
986 	/* needed for iio ops */
987 	if (rdev->rio_mem) {
988 		atom_card_info->ioreg_read = cail_ioreg_read;
989 		atom_card_info->ioreg_write = cail_ioreg_write;
990 	} else {
991 		DRM_ERROR("Unable to find PCI I/O BAR; using MMIO for ATOM IIO\n");
992 		atom_card_info->ioreg_read = cail_reg_read;
993 		atom_card_info->ioreg_write = cail_reg_write;
994 	}
995 	atom_card_info->mc_read = cail_mc_read;
996 	atom_card_info->mc_write = cail_mc_write;
997 	atom_card_info->pll_read = cail_pll_read;
998 	atom_card_info->pll_write = cail_pll_write;
999 
1000 	rdev->mode_info.atom_context = atom_parse(atom_card_info, rdev->bios);
1001 	if (!rdev->mode_info.atom_context) {
1002 		radeon_atombios_fini(rdev);
1003 		return -ENOMEM;
1004 	}
1005 
1006 	mutex_init(&rdev->mode_info.atom_context->mutex);
1007 	mutex_init(&rdev->mode_info.atom_context->scratch_mutex);
1008 	radeon_atom_initialize_bios_scratch_regs(rdev->ddev);
1009 	atom_allocate_fb_scratch(rdev->mode_info.atom_context);
1010 	return 0;
1011 }
1012 
1013 /**
1014  * radeon_atombios_fini - free the driver info and callbacks for atombios
1015  *
1016  * @rdev: radeon_device pointer
1017  *
1018  * Frees the driver info and register access callbacks for the ATOM
1019  * interpreter (r4xx+).
1020  * Called at driver shutdown.
1021  */
1022 void radeon_atombios_fini(struct radeon_device *rdev)
1023 {
1024 	if (rdev->mode_info.atom_context) {
1025 		kfree(rdev->mode_info.atom_context->scratch);
1026 	}
1027 	kfree(rdev->mode_info.atom_context);
1028 	rdev->mode_info.atom_context = NULL;
1029 	kfree(rdev->mode_info.atom_card_info);
1030 	rdev->mode_info.atom_card_info = NULL;
1031 }
1032 
1033 /* COMBIOS */
1034 /*
1035  * COMBIOS is the bios format prior to ATOM. It provides
1036  * command tables similar to ATOM, but doesn't have a unified
1037  * parser.  See radeon_combios.c
1038  */
1039 
1040 /**
1041  * radeon_combios_init - init the driver info for combios
1042  *
1043  * @rdev: radeon_device pointer
1044  *
1045  * Initializes the driver info for combios (r1xx-r3xx).
1046  * Returns 0 on sucess.
1047  * Called at driver startup.
1048  */
1049 int radeon_combios_init(struct radeon_device *rdev)
1050 {
1051 	radeon_combios_initialize_bios_scratch_regs(rdev->ddev);
1052 	return 0;
1053 }
1054 
1055 /**
1056  * radeon_combios_fini - free the driver info for combios
1057  *
1058  * @rdev: radeon_device pointer
1059  *
1060  * Frees the driver info for combios (r1xx-r3xx).
1061  * Called at driver shutdown.
1062  */
1063 void radeon_combios_fini(struct radeon_device *rdev)
1064 {
1065 }
1066 
1067 /* if we get transitioned to only one device, take VGA back */
1068 /**
1069  * radeon_vga_set_decode - enable/disable vga decode
1070  *
1071  * @pdev: PCI device
1072  * @state: enable/disable vga decode
1073  *
1074  * Enable/disable vga decode (all asics).
1075  * Returns VGA resource flags.
1076  */
1077 static unsigned int radeon_vga_set_decode(struct pci_dev *pdev, bool state)
1078 {
1079 	struct drm_device *dev = pci_get_drvdata(pdev);
1080 	struct radeon_device *rdev = dev->dev_private;
1081 	radeon_vga_set_state(rdev, state);
1082 	if (state)
1083 		return VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM |
1084 		       VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
1085 	else
1086 		return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
1087 }
1088 
1089 /**
1090  * radeon_gart_size_auto - Determine a sensible default GART size
1091  *                         according to ASIC family.
1092  *
1093  * @family: ASIC family name
1094  */
1095 static int radeon_gart_size_auto(enum radeon_family family)
1096 {
1097 	/* default to a larger gart size on newer asics */
1098 	if (family >= CHIP_TAHITI)
1099 		return 2048;
1100 	else if (family >= CHIP_RV770)
1101 		return 1024;
1102 	else
1103 		return 512;
1104 }
1105 
1106 /**
1107  * radeon_check_arguments - validate module params
1108  *
1109  * @rdev: radeon_device pointer
1110  *
1111  * Validates certain module parameters and updates
1112  * the associated values used by the driver (all asics).
1113  */
1114 static void radeon_check_arguments(struct radeon_device *rdev)
1115 {
1116 	/* vramlimit must be a power of two */
1117 	if (radeon_vram_limit != 0 && !is_power_of_2(radeon_vram_limit)) {
1118 		dev_warn(rdev->dev, "vram limit (%d) must be a power of 2\n",
1119 				radeon_vram_limit);
1120 		radeon_vram_limit = 0;
1121 	}
1122 
1123 	if (radeon_gart_size == -1) {
1124 		radeon_gart_size = radeon_gart_size_auto(rdev->family);
1125 	}
1126 	/* gtt size must be power of two and greater or equal to 32M */
1127 	if (radeon_gart_size < 32) {
1128 		dev_warn(rdev->dev, "gart size (%d) too small\n",
1129 				radeon_gart_size);
1130 		radeon_gart_size = radeon_gart_size_auto(rdev->family);
1131 	} else if (!is_power_of_2(radeon_gart_size)) {
1132 		dev_warn(rdev->dev, "gart size (%d) must be a power of 2\n",
1133 				radeon_gart_size);
1134 		radeon_gart_size = radeon_gart_size_auto(rdev->family);
1135 	}
1136 	rdev->mc.gtt_size = (uint64_t)radeon_gart_size << 20;
1137 
1138 	/* AGP mode can only be -1, 1, 2, 4, 8 */
1139 	switch (radeon_agpmode) {
1140 	case -1:
1141 	case 0:
1142 	case 1:
1143 	case 2:
1144 	case 4:
1145 	case 8:
1146 		break;
1147 	default:
1148 		dev_warn(rdev->dev, "invalid AGP mode %d (valid mode: "
1149 				"-1, 0, 1, 2, 4, 8)\n", radeon_agpmode);
1150 		radeon_agpmode = 0;
1151 		break;
1152 	}
1153 
1154 	if (!is_power_of_2(radeon_vm_size)) {
1155 		dev_warn(rdev->dev, "VM size (%d) must be a power of 2\n",
1156 			 radeon_vm_size);
1157 		radeon_vm_size = 4;
1158 	}
1159 
1160 	if (radeon_vm_size < 1) {
1161 		dev_warn(rdev->dev, "VM size (%d) too small, min is 1GB\n",
1162 			 radeon_vm_size);
1163 		radeon_vm_size = 4;
1164 	}
1165 
1166 	/*
1167 	 * Max GPUVM size for Cayman, SI and CI are 40 bits.
1168 	 */
1169 	if (radeon_vm_size > 1024) {
1170 		dev_warn(rdev->dev, "VM size (%d) too large, max is 1TB\n",
1171 			 radeon_vm_size);
1172 		radeon_vm_size = 4;
1173 	}
1174 
1175 	/* defines number of bits in page table versus page directory,
1176 	 * a page is 4KB so we have 12 bits offset, minimum 9 bits in the
1177 	 * page table and the remaining bits are in the page directory */
1178 	if (radeon_vm_block_size == -1) {
1179 
1180 		/* Total bits covered by PD + PTs */
1181 		unsigned bits = ilog2(radeon_vm_size) + 18;
1182 
1183 		/* Make sure the PD is 4K in size up to 8GB address space.
1184 		   Above that split equal between PD and PTs */
1185 		if (radeon_vm_size <= 8)
1186 			radeon_vm_block_size = bits - 9;
1187 		else
1188 			radeon_vm_block_size = (bits + 3) / 2;
1189 
1190 	} else if (radeon_vm_block_size < 9) {
1191 		dev_warn(rdev->dev, "VM page table size (%d) too small\n",
1192 			 radeon_vm_block_size);
1193 		radeon_vm_block_size = 9;
1194 	}
1195 
1196 	if (radeon_vm_block_size > 24 ||
1197 	    (radeon_vm_size * 1024) < (1ull << radeon_vm_block_size)) {
1198 		dev_warn(rdev->dev, "VM page table size (%d) too large\n",
1199 			 radeon_vm_block_size);
1200 		radeon_vm_block_size = 9;
1201 	}
1202 }
1203 
1204 /**
1205  * radeon_switcheroo_set_state - set switcheroo state
1206  *
1207  * @pdev: pci dev pointer
1208  * @state: vga_switcheroo state
1209  *
1210  * Callback for the switcheroo driver.  Suspends or resumes the
1211  * the asics before or after it is powered up using ACPI methods.
1212  */
1213 static void radeon_switcheroo_set_state(struct pci_dev *pdev, enum vga_switcheroo_state state)
1214 {
1215 	struct drm_device *dev = pci_get_drvdata(pdev);
1216 
1217 	if (radeon_is_px(dev) && state == VGA_SWITCHEROO_OFF)
1218 		return;
1219 
1220 	if (state == VGA_SWITCHEROO_ON) {
1221 		pr_info("radeon: switched on\n");
1222 		/* don't suspend or resume card normally */
1223 		dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
1224 
1225 		radeon_resume_kms(dev, true, true);
1226 
1227 		dev->switch_power_state = DRM_SWITCH_POWER_ON;
1228 		drm_kms_helper_poll_enable(dev);
1229 	} else {
1230 		pr_info("radeon: switched off\n");
1231 		drm_kms_helper_poll_disable(dev);
1232 		dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
1233 		radeon_suspend_kms(dev, true, true, false);
1234 		dev->switch_power_state = DRM_SWITCH_POWER_OFF;
1235 	}
1236 }
1237 
1238 /**
1239  * radeon_switcheroo_can_switch - see if switcheroo state can change
1240  *
1241  * @pdev: pci dev pointer
1242  *
1243  * Callback for the switcheroo driver.  Check of the switcheroo
1244  * state can be changed.
1245  * Returns true if the state can be changed, false if not.
1246  */
1247 static bool radeon_switcheroo_can_switch(struct pci_dev *pdev)
1248 {
1249 	struct drm_device *dev = pci_get_drvdata(pdev);
1250 
1251 	/*
1252 	 * FIXME: open_count is protected by drm_global_mutex but that would lead to
1253 	 * locking inversion with the driver load path. And the access here is
1254 	 * completely racy anyway. So don't bother with locking for now.
1255 	 */
1256 	return atomic_read(&dev->open_count) == 0;
1257 }
1258 
1259 static const struct vga_switcheroo_client_ops radeon_switcheroo_ops = {
1260 	.set_gpu_state = radeon_switcheroo_set_state,
1261 	.reprobe = NULL,
1262 	.can_switch = radeon_switcheroo_can_switch,
1263 };
1264 
1265 /**
1266  * radeon_device_init - initialize the driver
1267  *
1268  * @rdev: radeon_device pointer
1269  * @ddev: drm dev pointer
1270  * @pdev: pci dev pointer
1271  * @flags: driver flags
1272  *
1273  * Initializes the driver info and hw (all asics).
1274  * Returns 0 for success or an error on failure.
1275  * Called at driver startup.
1276  */
1277 int radeon_device_init(struct radeon_device *rdev,
1278 		       struct drm_device *ddev,
1279 		       struct pci_dev *pdev,
1280 		       uint32_t flags)
1281 {
1282 	int r, i;
1283 	int dma_bits;
1284 	bool runtime = false;
1285 
1286 	rdev->shutdown = false;
1287 	rdev->dev = &pdev->dev;
1288 	rdev->ddev = ddev;
1289 	rdev->pdev = pdev;
1290 	rdev->flags = flags;
1291 	rdev->family = flags & RADEON_FAMILY_MASK;
1292 	rdev->is_atom_bios = false;
1293 	rdev->usec_timeout = RADEON_MAX_USEC_TIMEOUT;
1294 	rdev->mc.gtt_size = 512 * 1024 * 1024;
1295 	rdev->accel_working = false;
1296 	/* set up ring ids */
1297 	for (i = 0; i < RADEON_NUM_RINGS; i++) {
1298 		rdev->ring[i].idx = i;
1299 	}
1300 	rdev->fence_context = dma_fence_context_alloc(RADEON_NUM_RINGS);
1301 
1302 	DRM_INFO("initializing kernel modesetting (%s 0x%04X:0x%04X 0x%04X:0x%04X 0x%02X).\n",
1303 		 radeon_family_name[rdev->family], pdev->vendor, pdev->device,
1304 		 pdev->subsystem_vendor, pdev->subsystem_device, pdev->revision);
1305 
1306 	/* mutex initialization are all done here so we
1307 	 * can recall function without having locking issues */
1308 	mutex_init(&rdev->ring_lock);
1309 	mutex_init(&rdev->dc_hw_i2c_mutex);
1310 	atomic_set(&rdev->ih.lock, 0);
1311 	mutex_init(&rdev->gem.mutex);
1312 	mutex_init(&rdev->pm.mutex);
1313 	mutex_init(&rdev->gpu_clock_mutex);
1314 	mutex_init(&rdev->srbm_mutex);
1315 	init_rwsem(&rdev->pm.mclk_lock);
1316 	init_rwsem(&rdev->exclusive_lock);
1317 	init_waitqueue_head(&rdev->irq.vblank_queue);
1318 	r = radeon_gem_init(rdev);
1319 	if (r)
1320 		return r;
1321 
1322 	radeon_check_arguments(rdev);
1323 	/* Adjust VM size here.
1324 	 * Max GPUVM size for cayman+ is 40 bits.
1325 	 */
1326 	rdev->vm_manager.max_pfn = radeon_vm_size << 18;
1327 
1328 	/* Set asic functions */
1329 	r = radeon_asic_init(rdev);
1330 	if (r)
1331 		return r;
1332 
1333 	/* all of the newer IGP chips have an internal gart
1334 	 * However some rs4xx report as AGP, so remove that here.
1335 	 */
1336 	if ((rdev->family >= CHIP_RS400) &&
1337 	    (rdev->flags & RADEON_IS_IGP)) {
1338 		rdev->flags &= ~RADEON_IS_AGP;
1339 	}
1340 
1341 	if (rdev->flags & RADEON_IS_AGP && radeon_agpmode == -1) {
1342 		radeon_agp_disable(rdev);
1343 	}
1344 
1345 	/* Set the internal MC address mask
1346 	 * This is the max address of the GPU's
1347 	 * internal address space.
1348 	 */
1349 	if (rdev->family >= CHIP_CAYMAN)
1350 		rdev->mc.mc_mask = 0xffffffffffULL; /* 40 bit MC */
1351 	else if (rdev->family >= CHIP_CEDAR)
1352 		rdev->mc.mc_mask = 0xfffffffffULL; /* 36 bit MC */
1353 	else
1354 		rdev->mc.mc_mask = 0xffffffffULL; /* 32 bit MC */
1355 
1356 	/* set DMA mask.
1357 	 * PCIE - can handle 40-bits.
1358 	 * IGP - can handle 40-bits
1359 	 * AGP - generally dma32 is safest
1360 	 * PCI - dma32 for legacy pci gart, 40 bits on newer asics
1361 	 */
1362 	dma_bits = 40;
1363 	if (rdev->flags & RADEON_IS_AGP)
1364 		dma_bits = 32;
1365 	if ((rdev->flags & RADEON_IS_PCI) &&
1366 	    (rdev->family <= CHIP_RS740))
1367 		dma_bits = 32;
1368 #ifdef CONFIG_PPC64
1369 	if (rdev->family == CHIP_CEDAR)
1370 		dma_bits = 32;
1371 #endif
1372 
1373 	r = dma_set_mask_and_coherent(&rdev->pdev->dev, DMA_BIT_MASK(dma_bits));
1374 	if (r) {
1375 		pr_warn("radeon: No suitable DMA available\n");
1376 		return r;
1377 	}
1378 	rdev->need_swiotlb = drm_need_swiotlb(dma_bits);
1379 
1380 	/* Registers mapping */
1381 	/* TODO: block userspace mapping of io register */
1382 	spin_lock_init(&rdev->mmio_idx_lock);
1383 	spin_lock_init(&rdev->smc_idx_lock);
1384 	spin_lock_init(&rdev->pll_idx_lock);
1385 	spin_lock_init(&rdev->mc_idx_lock);
1386 	spin_lock_init(&rdev->pcie_idx_lock);
1387 	spin_lock_init(&rdev->pciep_idx_lock);
1388 	spin_lock_init(&rdev->pif_idx_lock);
1389 	spin_lock_init(&rdev->cg_idx_lock);
1390 	spin_lock_init(&rdev->uvd_idx_lock);
1391 	spin_lock_init(&rdev->rcu_idx_lock);
1392 	spin_lock_init(&rdev->didt_idx_lock);
1393 	spin_lock_init(&rdev->end_idx_lock);
1394 	if (rdev->family >= CHIP_BONAIRE) {
1395 		rdev->rmmio_base = pci_resource_start(rdev->pdev, 5);
1396 		rdev->rmmio_size = pci_resource_len(rdev->pdev, 5);
1397 	} else {
1398 		rdev->rmmio_base = pci_resource_start(rdev->pdev, 2);
1399 		rdev->rmmio_size = pci_resource_len(rdev->pdev, 2);
1400 	}
1401 	rdev->rmmio = ioremap(rdev->rmmio_base, rdev->rmmio_size);
1402 	if (rdev->rmmio == NULL)
1403 		return -ENOMEM;
1404 
1405 	/* doorbell bar mapping */
1406 	if (rdev->family >= CHIP_BONAIRE)
1407 		radeon_doorbell_init(rdev);
1408 
1409 	/* io port mapping */
1410 	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
1411 		if (pci_resource_flags(rdev->pdev, i) & IORESOURCE_IO) {
1412 			rdev->rio_mem_size = pci_resource_len(rdev->pdev, i);
1413 			rdev->rio_mem = pci_iomap(rdev->pdev, i, rdev->rio_mem_size);
1414 			break;
1415 		}
1416 	}
1417 	if (rdev->rio_mem == NULL)
1418 		DRM_ERROR("Unable to find PCI I/O BAR\n");
1419 
1420 	if (rdev->flags & RADEON_IS_PX)
1421 		radeon_device_handle_px_quirks(rdev);
1422 
1423 	/* if we have > 1 VGA cards, then disable the radeon VGA resources */
1424 	/* this will fail for cards that aren't VGA class devices, just
1425 	 * ignore it */
1426 	vga_client_register(rdev->pdev, radeon_vga_set_decode);
1427 
1428 	if (rdev->flags & RADEON_IS_PX)
1429 		runtime = true;
1430 	if (!pci_is_thunderbolt_attached(rdev->pdev))
1431 		vga_switcheroo_register_client(rdev->pdev,
1432 					       &radeon_switcheroo_ops, runtime);
1433 	if (runtime)
1434 		vga_switcheroo_init_domain_pm_ops(rdev->dev, &rdev->vga_pm_domain);
1435 
1436 	r = radeon_init(rdev);
1437 	if (r)
1438 		goto failed;
1439 
1440 	radeon_gem_debugfs_init(rdev);
1441 	radeon_mst_debugfs_init(rdev);
1442 
1443 	if (rdev->flags & RADEON_IS_AGP && !rdev->accel_working) {
1444 		/* Acceleration not working on AGP card try again
1445 		 * with fallback to PCI or PCIE GART
1446 		 */
1447 		radeon_asic_reset(rdev);
1448 		radeon_fini(rdev);
1449 		radeon_agp_disable(rdev);
1450 		r = radeon_init(rdev);
1451 		if (r)
1452 			goto failed;
1453 	}
1454 
1455 	r = radeon_ib_ring_tests(rdev);
1456 	if (r)
1457 		DRM_ERROR("ib ring test failed (%d).\n", r);
1458 
1459 	/*
1460 	 * Turks/Thames GPU will freeze whole laptop if DPM is not restarted
1461 	 * after the CP ring have chew one packet at least. Hence here we stop
1462 	 * and restart DPM after the radeon_ib_ring_tests().
1463 	 */
1464 	if (rdev->pm.dpm_enabled &&
1465 	    (rdev->pm.pm_method == PM_METHOD_DPM) &&
1466 	    (rdev->family == CHIP_TURKS) &&
1467 	    (rdev->flags & RADEON_IS_MOBILITY)) {
1468 		mutex_lock(&rdev->pm.mutex);
1469 		radeon_dpm_disable(rdev);
1470 		radeon_dpm_enable(rdev);
1471 		mutex_unlock(&rdev->pm.mutex);
1472 	}
1473 
1474 	if ((radeon_testing & 1)) {
1475 		if (rdev->accel_working)
1476 			radeon_test_moves(rdev);
1477 		else
1478 			DRM_INFO("radeon: acceleration disabled, skipping move tests\n");
1479 	}
1480 	if ((radeon_testing & 2)) {
1481 		if (rdev->accel_working)
1482 			radeon_test_syncing(rdev);
1483 		else
1484 			DRM_INFO("radeon: acceleration disabled, skipping sync tests\n");
1485 	}
1486 	if (radeon_benchmarking) {
1487 		if (rdev->accel_working)
1488 			radeon_benchmark(rdev, radeon_benchmarking);
1489 		else
1490 			DRM_INFO("radeon: acceleration disabled, skipping benchmarks\n");
1491 	}
1492 	return 0;
1493 
1494 failed:
1495 	/* balance pm_runtime_get_sync() in radeon_driver_unload_kms() */
1496 	if (radeon_is_px(ddev))
1497 		pm_runtime_put_noidle(ddev->dev);
1498 	if (runtime)
1499 		vga_switcheroo_fini_domain_pm_ops(rdev->dev);
1500 	return r;
1501 }
1502 
1503 /**
1504  * radeon_device_fini - tear down the driver
1505  *
1506  * @rdev: radeon_device pointer
1507  *
1508  * Tear down the driver info (all asics).
1509  * Called at driver shutdown.
1510  */
1511 void radeon_device_fini(struct radeon_device *rdev)
1512 {
1513 	DRM_INFO("radeon: finishing device.\n");
1514 	rdev->shutdown = true;
1515 	/* evict vram memory */
1516 	radeon_bo_evict_vram(rdev);
1517 	radeon_fini(rdev);
1518 	if (!pci_is_thunderbolt_attached(rdev->pdev))
1519 		vga_switcheroo_unregister_client(rdev->pdev);
1520 	if (rdev->flags & RADEON_IS_PX)
1521 		vga_switcheroo_fini_domain_pm_ops(rdev->dev);
1522 	vga_client_unregister(rdev->pdev);
1523 	if (rdev->rio_mem)
1524 		pci_iounmap(rdev->pdev, rdev->rio_mem);
1525 	rdev->rio_mem = NULL;
1526 	iounmap(rdev->rmmio);
1527 	rdev->rmmio = NULL;
1528 	if (rdev->family >= CHIP_BONAIRE)
1529 		radeon_doorbell_fini(rdev);
1530 }
1531 
1532 
1533 /*
1534  * Suspend & resume.
1535  */
1536 /*
1537  * radeon_suspend_kms - initiate device suspend
1538  *
1539  * Puts the hw in the suspend state (all asics).
1540  * Returns 0 for success or an error on failure.
1541  * Called at driver suspend.
1542  */
1543 int radeon_suspend_kms(struct drm_device *dev, bool suspend,
1544 		       bool fbcon, bool freeze)
1545 {
1546 	struct radeon_device *rdev;
1547 	struct pci_dev *pdev;
1548 	struct drm_crtc *crtc;
1549 	struct drm_connector *connector;
1550 	int i, r;
1551 
1552 	if (dev == NULL || dev->dev_private == NULL) {
1553 		return -ENODEV;
1554 	}
1555 
1556 	rdev = dev->dev_private;
1557 	pdev = to_pci_dev(dev->dev);
1558 
1559 	if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
1560 		return 0;
1561 
1562 	drm_kms_helper_poll_disable(dev);
1563 
1564 	drm_modeset_lock_all(dev);
1565 	/* turn off display hw */
1566 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1567 		drm_helper_connector_dpms(connector, DRM_MODE_DPMS_OFF);
1568 	}
1569 	drm_modeset_unlock_all(dev);
1570 
1571 	/* unpin the front buffers and cursors */
1572 	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1573 		struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);
1574 		struct drm_framebuffer *fb = crtc->primary->fb;
1575 		struct radeon_bo *robj;
1576 
1577 		if (radeon_crtc->cursor_bo) {
1578 			struct radeon_bo *robj = gem_to_radeon_bo(radeon_crtc->cursor_bo);
1579 			r = radeon_bo_reserve(robj, false);
1580 			if (r == 0) {
1581 				radeon_bo_unpin(robj);
1582 				radeon_bo_unreserve(robj);
1583 			}
1584 		}
1585 
1586 		if (fb == NULL || fb->obj[0] == NULL) {
1587 			continue;
1588 		}
1589 		robj = gem_to_radeon_bo(fb->obj[0]);
1590 		/* don't unpin kernel fb objects */
1591 		if (!radeon_fbdev_robj_is_fb(rdev, robj)) {
1592 			r = radeon_bo_reserve(robj, false);
1593 			if (r == 0) {
1594 				radeon_bo_unpin(robj);
1595 				radeon_bo_unreserve(robj);
1596 			}
1597 		}
1598 	}
1599 	/* evict vram memory */
1600 	radeon_bo_evict_vram(rdev);
1601 
1602 	/* wait for gpu to finish processing current batch */
1603 	for (i = 0; i < RADEON_NUM_RINGS; i++) {
1604 		r = radeon_fence_wait_empty(rdev, i);
1605 		if (r) {
1606 			/* delay GPU reset to resume */
1607 			radeon_fence_driver_force_completion(rdev, i);
1608 		}
1609 	}
1610 
1611 	radeon_save_bios_scratch_regs(rdev);
1612 
1613 	radeon_suspend(rdev);
1614 	radeon_hpd_fini(rdev);
1615 	/* evict remaining vram memory
1616 	 * This second call to evict vram is to evict the gart page table
1617 	 * using the CPU.
1618 	 */
1619 	radeon_bo_evict_vram(rdev);
1620 
1621 	radeon_agp_suspend(rdev);
1622 
1623 	pci_save_state(pdev);
1624 	if (freeze && rdev->family >= CHIP_CEDAR && !(rdev->flags & RADEON_IS_IGP)) {
1625 		rdev->asic->asic_reset(rdev, true);
1626 		pci_restore_state(pdev);
1627 	} else if (suspend) {
1628 		/* Shut down the device */
1629 		pci_disable_device(pdev);
1630 		pci_set_power_state(pdev, PCI_D3hot);
1631 	}
1632 
1633 	if (fbcon) {
1634 		console_lock();
1635 		radeon_fbdev_set_suspend(rdev, 1);
1636 		console_unlock();
1637 	}
1638 	return 0;
1639 }
1640 
1641 /*
1642  * radeon_resume_kms - initiate device resume
1643  *
1644  * Bring the hw back to operating state (all asics).
1645  * Returns 0 for success or an error on failure.
1646  * Called at driver resume.
1647  */
1648 int radeon_resume_kms(struct drm_device *dev, bool resume, bool fbcon)
1649 {
1650 	struct drm_connector *connector;
1651 	struct radeon_device *rdev = dev->dev_private;
1652 	struct pci_dev *pdev = to_pci_dev(dev->dev);
1653 	struct drm_crtc *crtc;
1654 	int r;
1655 
1656 	if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
1657 		return 0;
1658 
1659 	if (fbcon) {
1660 		console_lock();
1661 	}
1662 	if (resume) {
1663 		pci_set_power_state(pdev, PCI_D0);
1664 		pci_restore_state(pdev);
1665 		if (pci_enable_device(pdev)) {
1666 			if (fbcon)
1667 				console_unlock();
1668 			return -1;
1669 		}
1670 	}
1671 	/* resume AGP if in use */
1672 	radeon_agp_resume(rdev);
1673 	radeon_resume(rdev);
1674 
1675 	r = radeon_ib_ring_tests(rdev);
1676 	if (r)
1677 		DRM_ERROR("ib ring test failed (%d).\n", r);
1678 
1679 	if ((rdev->pm.pm_method == PM_METHOD_DPM) && rdev->pm.dpm_enabled) {
1680 		/* do dpm late init */
1681 		r = radeon_pm_late_init(rdev);
1682 		if (r) {
1683 			rdev->pm.dpm_enabled = false;
1684 			DRM_ERROR("radeon_pm_late_init failed, disabling dpm\n");
1685 		}
1686 	} else {
1687 		/* resume old pm late */
1688 		radeon_pm_resume(rdev);
1689 	}
1690 
1691 	radeon_restore_bios_scratch_regs(rdev);
1692 
1693 	/* pin cursors */
1694 	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1695 		struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);
1696 
1697 		if (radeon_crtc->cursor_bo) {
1698 			struct radeon_bo *robj = gem_to_radeon_bo(radeon_crtc->cursor_bo);
1699 			r = radeon_bo_reserve(robj, false);
1700 			if (r == 0) {
1701 				/* Only 27 bit offset for legacy cursor */
1702 				r = radeon_bo_pin_restricted(robj,
1703 							     RADEON_GEM_DOMAIN_VRAM,
1704 							     ASIC_IS_AVIVO(rdev) ?
1705 							     0 : 1 << 27,
1706 							     &radeon_crtc->cursor_addr);
1707 				if (r != 0)
1708 					DRM_ERROR("Failed to pin cursor BO (%d)\n", r);
1709 				radeon_bo_unreserve(robj);
1710 			}
1711 		}
1712 	}
1713 
1714 	/* init dig PHYs, disp eng pll */
1715 	if (rdev->is_atom_bios) {
1716 		radeon_atom_encoder_init(rdev);
1717 		radeon_atom_disp_eng_pll_init(rdev);
1718 		/* turn on the BL */
1719 		if (rdev->mode_info.bl_encoder) {
1720 			u8 bl_level = radeon_get_backlight_level(rdev,
1721 								 rdev->mode_info.bl_encoder);
1722 			radeon_set_backlight_level(rdev, rdev->mode_info.bl_encoder,
1723 						   bl_level);
1724 		}
1725 	}
1726 	/* reset hpd state */
1727 	radeon_hpd_init(rdev);
1728 	/* blat the mode back in */
1729 	if (fbcon) {
1730 		drm_helper_resume_force_mode(dev);
1731 		/* turn on display hw */
1732 		drm_modeset_lock_all(dev);
1733 		list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1734 			drm_helper_connector_dpms(connector, DRM_MODE_DPMS_ON);
1735 		}
1736 		drm_modeset_unlock_all(dev);
1737 	}
1738 
1739 	drm_kms_helper_poll_enable(dev);
1740 
1741 	/* set the power state here in case we are a PX system or headless */
1742 	if ((rdev->pm.pm_method == PM_METHOD_DPM) && rdev->pm.dpm_enabled)
1743 		radeon_pm_compute_clocks(rdev);
1744 
1745 	if (fbcon) {
1746 		radeon_fbdev_set_suspend(rdev, 0);
1747 		console_unlock();
1748 	}
1749 
1750 	return 0;
1751 }
1752 
1753 /**
1754  * radeon_gpu_reset - reset the asic
1755  *
1756  * @rdev: radeon device pointer
1757  *
1758  * Attempt the reset the GPU if it has hung (all asics).
1759  * Returns 0 for success or an error on failure.
1760  */
1761 int radeon_gpu_reset(struct radeon_device *rdev)
1762 {
1763 	unsigned ring_sizes[RADEON_NUM_RINGS];
1764 	uint32_t *ring_data[RADEON_NUM_RINGS];
1765 
1766 	bool saved = false;
1767 
1768 	int i, r;
1769 	int resched;
1770 
1771 	down_write(&rdev->exclusive_lock);
1772 
1773 	if (!rdev->needs_reset) {
1774 		up_write(&rdev->exclusive_lock);
1775 		return 0;
1776 	}
1777 
1778 	atomic_inc(&rdev->gpu_reset_counter);
1779 
1780 	radeon_save_bios_scratch_regs(rdev);
1781 	/* block TTM */
1782 	resched = ttm_bo_lock_delayed_workqueue(&rdev->mman.bdev);
1783 	radeon_suspend(rdev);
1784 	radeon_hpd_fini(rdev);
1785 
1786 	for (i = 0; i < RADEON_NUM_RINGS; ++i) {
1787 		ring_sizes[i] = radeon_ring_backup(rdev, &rdev->ring[i],
1788 						   &ring_data[i]);
1789 		if (ring_sizes[i]) {
1790 			saved = true;
1791 			dev_info(rdev->dev, "Saved %d dwords of commands "
1792 				 "on ring %d.\n", ring_sizes[i], i);
1793 		}
1794 	}
1795 
1796 	r = radeon_asic_reset(rdev);
1797 	if (!r) {
1798 		dev_info(rdev->dev, "GPU reset succeeded, trying to resume\n");
1799 		radeon_resume(rdev);
1800 	}
1801 
1802 	radeon_restore_bios_scratch_regs(rdev);
1803 
1804 	for (i = 0; i < RADEON_NUM_RINGS; ++i) {
1805 		if (!r && ring_data[i]) {
1806 			radeon_ring_restore(rdev, &rdev->ring[i],
1807 					    ring_sizes[i], ring_data[i]);
1808 		} else {
1809 			radeon_fence_driver_force_completion(rdev, i);
1810 			kfree(ring_data[i]);
1811 		}
1812 	}
1813 
1814 	if ((rdev->pm.pm_method == PM_METHOD_DPM) && rdev->pm.dpm_enabled) {
1815 		/* do dpm late init */
1816 		r = radeon_pm_late_init(rdev);
1817 		if (r) {
1818 			rdev->pm.dpm_enabled = false;
1819 			DRM_ERROR("radeon_pm_late_init failed, disabling dpm\n");
1820 		}
1821 	} else {
1822 		/* resume old pm late */
1823 		radeon_pm_resume(rdev);
1824 	}
1825 
1826 	/* init dig PHYs, disp eng pll */
1827 	if (rdev->is_atom_bios) {
1828 		radeon_atom_encoder_init(rdev);
1829 		radeon_atom_disp_eng_pll_init(rdev);
1830 		/* turn on the BL */
1831 		if (rdev->mode_info.bl_encoder) {
1832 			u8 bl_level = radeon_get_backlight_level(rdev,
1833 								 rdev->mode_info.bl_encoder);
1834 			radeon_set_backlight_level(rdev, rdev->mode_info.bl_encoder,
1835 						   bl_level);
1836 		}
1837 	}
1838 	/* reset hpd state */
1839 	radeon_hpd_init(rdev);
1840 
1841 	ttm_bo_unlock_delayed_workqueue(&rdev->mman.bdev, resched);
1842 
1843 	rdev->in_reset = true;
1844 	rdev->needs_reset = false;
1845 
1846 	downgrade_write(&rdev->exclusive_lock);
1847 
1848 	drm_helper_resume_force_mode(rdev->ddev);
1849 
1850 	/* set the power state here in case we are a PX system or headless */
1851 	if ((rdev->pm.pm_method == PM_METHOD_DPM) && rdev->pm.dpm_enabled)
1852 		radeon_pm_compute_clocks(rdev);
1853 
1854 	if (!r) {
1855 		r = radeon_ib_ring_tests(rdev);
1856 		if (r && saved)
1857 			r = -EAGAIN;
1858 	} else {
1859 		/* bad news, how to tell it to userspace ? */
1860 		dev_info(rdev->dev, "GPU reset failed\n");
1861 	}
1862 
1863 	rdev->needs_reset = r == -EAGAIN;
1864 	rdev->in_reset = false;
1865 
1866 	up_read(&rdev->exclusive_lock);
1867 	return r;
1868 }
1869