2 * Copyright © 2013 Intel Corporation
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:
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
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
25 #include "intel_drv.h"
27 #define FORCEWAKE_ACK_TIMEOUT_MS 2
29 #define __raw_i915_read8(dev_priv__, reg__) readb((dev_priv__)->regs + (reg__))
30 #define __raw_i915_write8(dev_priv__, reg__, val__) writeb(val__, (dev_priv__)->regs + (reg__))
32 #define __raw_i915_read16(dev_priv__, reg__) readw((dev_priv__)->regs + (reg__))
33 #define __raw_i915_write16(dev_priv__, reg__, val__) writew(val__, (dev_priv__)->regs + (reg__))
35 #define __raw_i915_read32(dev_priv__, reg__) readl((dev_priv__)->regs + (reg__))
36 #define __raw_i915_write32(dev_priv__, reg__, val__) writel(val__, (dev_priv__)->regs + (reg__))
38 #define __raw_i915_read64(dev_priv__, reg__) readq((dev_priv__)->regs + (reg__))
39 #define __raw_i915_write64(dev_priv__, reg__, val__) writeq(val__, (dev_priv__)->regs + (reg__))
41 #define __raw_posting_read(dev_priv__, reg__) (void)__raw_i915_read32(dev_priv__, reg__)
44 static void __gen6_gt_wait_for_thread_c0(struct drm_i915_private *dev_priv)
46 u32 gt_thread_status_mask;
48 if (IS_HASWELL(dev_priv->dev))
49 gt_thread_status_mask = GEN6_GT_THREAD_STATUS_CORE_MASK_HSW;
51 gt_thread_status_mask = GEN6_GT_THREAD_STATUS_CORE_MASK;
53 /* w/a for a sporadic read returning 0 by waiting for the GT
56 if (wait_for_atomic_us((__raw_i915_read32(dev_priv, GEN6_GT_THREAD_STATUS_REG) & gt_thread_status_mask) == 0, 500))
57 DRM_ERROR("GT thread status wait timed out\n");
60 static void __gen6_gt_force_wake_reset(struct drm_i915_private *dev_priv)
62 __raw_i915_write32(dev_priv, FORCEWAKE, 0);
63 /* something from same cacheline, but !FORCEWAKE */
64 __raw_posting_read(dev_priv, ECOBUS);
67 static void __gen6_gt_force_wake_get(struct drm_i915_private *dev_priv)
69 if (wait_for_atomic((__raw_i915_read32(dev_priv, FORCEWAKE_ACK) & 1) == 0,
70 FORCEWAKE_ACK_TIMEOUT_MS))
71 DRM_ERROR("Timed out waiting for forcewake old ack to clear.\n");
73 __raw_i915_write32(dev_priv, FORCEWAKE, 1);
74 /* something from same cacheline, but !FORCEWAKE */
75 __raw_posting_read(dev_priv, ECOBUS);
77 if (wait_for_atomic((__raw_i915_read32(dev_priv, FORCEWAKE_ACK) & 1),
78 FORCEWAKE_ACK_TIMEOUT_MS))
79 DRM_ERROR("Timed out waiting for forcewake to ack request.\n");
81 /* WaRsForcewakeWaitTC0:snb */
82 __gen6_gt_wait_for_thread_c0(dev_priv);
85 static void __gen6_gt_force_wake_mt_reset(struct drm_i915_private *dev_priv)
87 __raw_i915_write32(dev_priv, FORCEWAKE_MT, _MASKED_BIT_DISABLE(0xffff));
88 /* something from same cacheline, but !FORCEWAKE_MT */
89 __raw_posting_read(dev_priv, ECOBUS);
92 static void __gen6_gt_force_wake_mt_get(struct drm_i915_private *dev_priv)
96 if (IS_HASWELL(dev_priv->dev))
97 forcewake_ack = FORCEWAKE_ACK_HSW;
99 forcewake_ack = FORCEWAKE_MT_ACK;
101 if (wait_for_atomic((__raw_i915_read32(dev_priv, forcewake_ack) & FORCEWAKE_KERNEL) == 0,
102 FORCEWAKE_ACK_TIMEOUT_MS))
103 DRM_ERROR("Timed out waiting for forcewake old ack to clear.\n");
105 __raw_i915_write32(dev_priv, FORCEWAKE_MT,
106 _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL));
107 /* something from same cacheline, but !FORCEWAKE_MT */
108 __raw_posting_read(dev_priv, ECOBUS);
110 if (wait_for_atomic((__raw_i915_read32(dev_priv, forcewake_ack) & FORCEWAKE_KERNEL),
111 FORCEWAKE_ACK_TIMEOUT_MS))
112 DRM_ERROR("Timed out waiting for forcewake to ack request.\n");
114 /* WaRsForcewakeWaitTC0:ivb,hsw */
115 __gen6_gt_wait_for_thread_c0(dev_priv);
118 static void gen6_gt_check_fifodbg(struct drm_i915_private *dev_priv)
122 gtfifodbg = __raw_i915_read32(dev_priv, GTFIFODBG);
123 if (WARN(gtfifodbg & GT_FIFO_CPU_ERROR_MASK,
124 "MMIO read or write has been dropped %x\n", gtfifodbg))
125 __raw_i915_write32(dev_priv, GTFIFODBG, GT_FIFO_CPU_ERROR_MASK);
128 static void __gen6_gt_force_wake_put(struct drm_i915_private *dev_priv)
130 __raw_i915_write32(dev_priv, FORCEWAKE, 0);
131 /* something from same cacheline, but !FORCEWAKE */
132 __raw_posting_read(dev_priv, ECOBUS);
133 gen6_gt_check_fifodbg(dev_priv);
136 static void __gen6_gt_force_wake_mt_put(struct drm_i915_private *dev_priv)
138 __raw_i915_write32(dev_priv, FORCEWAKE_MT,
139 _MASKED_BIT_DISABLE(FORCEWAKE_KERNEL));
140 /* something from same cacheline, but !FORCEWAKE_MT */
141 __raw_posting_read(dev_priv, ECOBUS);
142 gen6_gt_check_fifodbg(dev_priv);
145 static int __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv)
149 if (dev_priv->uncore.fifo_count < GT_FIFO_NUM_RESERVED_ENTRIES) {
151 u32 fifo = __raw_i915_read32(dev_priv, GT_FIFO_FREE_ENTRIES);
152 while (fifo <= GT_FIFO_NUM_RESERVED_ENTRIES && loop--) {
154 fifo = __raw_i915_read32(dev_priv, GT_FIFO_FREE_ENTRIES);
156 if (WARN_ON(loop < 0 && fifo <= GT_FIFO_NUM_RESERVED_ENTRIES))
158 dev_priv->uncore.fifo_count = fifo;
160 dev_priv->uncore.fifo_count--;
165 static void vlv_force_wake_reset(struct drm_i915_private *dev_priv)
167 __raw_i915_write32(dev_priv, FORCEWAKE_VLV,
168 _MASKED_BIT_DISABLE(0xffff));
169 /* something from same cacheline, but !FORCEWAKE_VLV */
170 __raw_posting_read(dev_priv, FORCEWAKE_ACK_VLV);
173 static void vlv_force_wake_get(struct drm_i915_private *dev_priv)
175 if (wait_for_atomic((__raw_i915_read32(dev_priv, FORCEWAKE_ACK_VLV) & FORCEWAKE_KERNEL) == 0,
176 FORCEWAKE_ACK_TIMEOUT_MS))
177 DRM_ERROR("Timed out waiting for forcewake old ack to clear.\n");
179 __raw_i915_write32(dev_priv, FORCEWAKE_VLV,
180 _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL));
181 __raw_i915_write32(dev_priv, FORCEWAKE_MEDIA_VLV,
182 _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL));
184 if (wait_for_atomic((__raw_i915_read32(dev_priv, FORCEWAKE_ACK_VLV) & FORCEWAKE_KERNEL),
185 FORCEWAKE_ACK_TIMEOUT_MS))
186 DRM_ERROR("Timed out waiting for GT to ack forcewake request.\n");
188 if (wait_for_atomic((__raw_i915_read32(dev_priv, FORCEWAKE_ACK_MEDIA_VLV) &
190 FORCEWAKE_ACK_TIMEOUT_MS))
191 DRM_ERROR("Timed out waiting for media to ack forcewake request.\n");
193 /* WaRsForcewakeWaitTC0:vlv */
194 __gen6_gt_wait_for_thread_c0(dev_priv);
197 static void vlv_force_wake_put(struct drm_i915_private *dev_priv)
199 __raw_i915_write32(dev_priv, FORCEWAKE_VLV,
200 _MASKED_BIT_DISABLE(FORCEWAKE_KERNEL));
201 __raw_i915_write32(dev_priv, FORCEWAKE_MEDIA_VLV,
202 _MASKED_BIT_DISABLE(FORCEWAKE_KERNEL));
203 /* The below doubles as a POSTING_READ */
204 gen6_gt_check_fifodbg(dev_priv);
207 static void gen6_force_wake_work(struct work_struct *work)
209 struct drm_i915_private *dev_priv =
210 container_of(work, typeof(*dev_priv), uncore.force_wake_work.work);
211 unsigned long irqflags;
213 spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
214 if (--dev_priv->uncore.forcewake_count == 0)
215 dev_priv->uncore.funcs.force_wake_put(dev_priv);
216 spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
219 void intel_uncore_early_sanitize(struct drm_device *dev)
221 struct drm_i915_private *dev_priv = dev->dev_private;
223 if (HAS_FPGA_DBG_UNCLAIMED(dev))
224 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
226 if (IS_HASWELL(dev) &&
227 (__raw_i915_read32(dev_priv, HSW_EDRAM_PRESENT) == 1)) {
228 /* The docs do not explain exactly how the calculation can be
229 * made. It is somewhat guessable, but for now, it's always
231 * NB: We can't write IDICR yet because we do not have gt funcs
233 dev_priv->ellc_size = 128;
234 DRM_INFO("Found %zuMB of eLLC\n", dev_priv->ellc_size);
238 static void intel_uncore_forcewake_reset(struct drm_device *dev)
240 struct drm_i915_private *dev_priv = dev->dev_private;
242 if (IS_VALLEYVIEW(dev)) {
243 vlv_force_wake_reset(dev_priv);
244 } else if (INTEL_INFO(dev)->gen >= 6) {
245 __gen6_gt_force_wake_reset(dev_priv);
246 if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev))
247 __gen6_gt_force_wake_mt_reset(dev_priv);
251 void intel_uncore_sanitize(struct drm_device *dev)
253 struct drm_i915_private *dev_priv = dev->dev_private;
256 intel_uncore_forcewake_reset(dev);
258 /* BIOS often leaves RC6 enabled, but disable it for hw init */
259 intel_disable_gt_powersave(dev);
261 /* Turn off power gate, require especially for the BIOS less system */
262 if (IS_VALLEYVIEW(dev)) {
264 mutex_lock(&dev_priv->rps.hw_lock);
265 reg_val = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS);
267 if (reg_val & (RENDER_PWRGT | MEDIA_PWRGT | DISP2D_PWRGT))
268 vlv_punit_write(dev_priv, PUNIT_REG_PWRGT_CTRL, 0x0);
270 mutex_unlock(&dev_priv->rps.hw_lock);
276 * Generally this is called implicitly by the register read function. However,
277 * if some sequence requires the GT to not power down then this function should
278 * be called at the beginning of the sequence followed by a call to
279 * gen6_gt_force_wake_put() at the end of the sequence.
281 void gen6_gt_force_wake_get(struct drm_i915_private *dev_priv)
283 unsigned long irqflags;
285 if (!dev_priv->uncore.funcs.force_wake_get)
288 spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
289 if (dev_priv->uncore.forcewake_count++ == 0)
290 dev_priv->uncore.funcs.force_wake_get(dev_priv);
291 spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
295 * see gen6_gt_force_wake_get()
297 void gen6_gt_force_wake_put(struct drm_i915_private *dev_priv)
299 unsigned long irqflags;
301 if (!dev_priv->uncore.funcs.force_wake_put)
304 spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
305 if (--dev_priv->uncore.forcewake_count == 0) {
306 dev_priv->uncore.forcewake_count++;
307 mod_delayed_work(dev_priv->wq,
308 &dev_priv->uncore.force_wake_work,
311 spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
314 /* We give fast paths for the really cool registers */
315 #define NEEDS_FORCE_WAKE(dev_priv, reg) \
316 ((reg) < 0x40000 && (reg) != FORCEWAKE)
319 ilk_dummy_write(struct drm_i915_private *dev_priv)
321 /* WaIssueDummyWriteToWakeupFromRC6:ilk Issue a dummy write to wake up
322 * the chip from rc6 before touching it for real. MI_MODE is masked,
323 * hence harmless to write 0 into. */
324 __raw_i915_write32(dev_priv, MI_MODE, 0);
328 hsw_unclaimed_reg_clear(struct drm_i915_private *dev_priv, u32 reg)
330 if (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM) {
331 DRM_ERROR("Unknown unclaimed register before writing to %x\n",
333 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
338 hsw_unclaimed_reg_check(struct drm_i915_private *dev_priv, u32 reg)
340 if (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM) {
341 DRM_ERROR("Unclaimed write to %x\n", reg);
342 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
346 #define REG_READ_HEADER(x) \
347 unsigned long irqflags; \
349 spin_lock_irqsave(&dev_priv->uncore.lock, irqflags)
351 #define REG_READ_FOOTER \
352 spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
353 trace_i915_reg_rw(false, reg, val, sizeof(val), trace); \
356 #define __gen4_read(x) \
358 gen4_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
359 REG_READ_HEADER(x); \
360 val = __raw_i915_read##x(dev_priv, reg); \
364 #define __gen5_read(x) \
366 gen5_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
367 REG_READ_HEADER(x); \
368 ilk_dummy_write(dev_priv); \
369 val = __raw_i915_read##x(dev_priv, reg); \
373 #define __gen6_read(x) \
375 gen6_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
376 REG_READ_HEADER(x); \
377 if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
378 if (dev_priv->uncore.forcewake_count == 0) \
379 dev_priv->uncore.funcs.force_wake_get(dev_priv); \
380 val = __raw_i915_read##x(dev_priv, reg); \
381 if (dev_priv->uncore.forcewake_count == 0) \
382 dev_priv->uncore.funcs.force_wake_put(dev_priv); \
384 val = __raw_i915_read##x(dev_priv, reg); \
405 #undef REG_READ_FOOTER
406 #undef REG_READ_HEADER
408 #define REG_WRITE_HEADER \
409 unsigned long irqflags; \
410 trace_i915_reg_rw(true, reg, val, sizeof(val), trace); \
411 spin_lock_irqsave(&dev_priv->uncore.lock, irqflags)
413 #define __gen4_write(x) \
415 gen4_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \
417 __raw_i915_write##x(dev_priv, reg, val); \
418 spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
421 #define __gen5_write(x) \
423 gen5_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \
425 ilk_dummy_write(dev_priv); \
426 __raw_i915_write##x(dev_priv, reg, val); \
427 spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
430 #define __gen6_write(x) \
432 gen6_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \
433 u32 __fifo_ret = 0; \
435 if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
436 __fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \
438 __raw_i915_write##x(dev_priv, reg, val); \
439 if (unlikely(__fifo_ret)) { \
440 gen6_gt_check_fifodbg(dev_priv); \
442 spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
445 #define __hsw_write(x) \
447 hsw_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \
448 u32 __fifo_ret = 0; \
450 if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
451 __fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \
453 hsw_unclaimed_reg_clear(dev_priv, reg); \
454 __raw_i915_write##x(dev_priv, reg, val); \
455 if (unlikely(__fifo_ret)) { \
456 gen6_gt_check_fifodbg(dev_priv); \
458 hsw_unclaimed_reg_check(dev_priv, reg); \
459 spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
483 #undef REG_WRITE_HEADER
485 void intel_uncore_init(struct drm_device *dev)
487 struct drm_i915_private *dev_priv = dev->dev_private;
489 INIT_DELAYED_WORK(&dev_priv->uncore.force_wake_work,
490 gen6_force_wake_work);
492 if (IS_VALLEYVIEW(dev)) {
493 dev_priv->uncore.funcs.force_wake_get = vlv_force_wake_get;
494 dev_priv->uncore.funcs.force_wake_put = vlv_force_wake_put;
495 } else if (IS_HASWELL(dev)) {
496 dev_priv->uncore.funcs.force_wake_get = __gen6_gt_force_wake_mt_get;
497 dev_priv->uncore.funcs.force_wake_put = __gen6_gt_force_wake_mt_put;
498 } else if (IS_IVYBRIDGE(dev)) {
501 /* IVB configs may use multi-threaded forcewake */
503 /* A small trick here - if the bios hasn't configured
504 * MT forcewake, and if the device is in RC6, then
505 * force_wake_mt_get will not wake the device and the
506 * ECOBUS read will return zero. Which will be
507 * (correctly) interpreted by the test below as MT
508 * forcewake being disabled.
510 mutex_lock(&dev->struct_mutex);
511 __gen6_gt_force_wake_mt_get(dev_priv);
512 ecobus = __raw_i915_read32(dev_priv, ECOBUS);
513 __gen6_gt_force_wake_mt_put(dev_priv);
514 mutex_unlock(&dev->struct_mutex);
516 if (ecobus & FORCEWAKE_MT_ENABLE) {
517 dev_priv->uncore.funcs.force_wake_get =
518 __gen6_gt_force_wake_mt_get;
519 dev_priv->uncore.funcs.force_wake_put =
520 __gen6_gt_force_wake_mt_put;
522 DRM_INFO("No MT forcewake available on Ivybridge, this can result in issues\n");
523 DRM_INFO("when using vblank-synced partial screen updates.\n");
524 dev_priv->uncore.funcs.force_wake_get =
525 __gen6_gt_force_wake_get;
526 dev_priv->uncore.funcs.force_wake_put =
527 __gen6_gt_force_wake_put;
529 } else if (IS_GEN6(dev)) {
530 dev_priv->uncore.funcs.force_wake_get =
531 __gen6_gt_force_wake_get;
532 dev_priv->uncore.funcs.force_wake_put =
533 __gen6_gt_force_wake_put;
536 switch (INTEL_INFO(dev)->gen) {
539 if (IS_HASWELL(dev)) {
540 dev_priv->uncore.funcs.mmio_writeb = hsw_write8;
541 dev_priv->uncore.funcs.mmio_writew = hsw_write16;
542 dev_priv->uncore.funcs.mmio_writel = hsw_write32;
543 dev_priv->uncore.funcs.mmio_writeq = hsw_write64;
545 dev_priv->uncore.funcs.mmio_writeb = gen6_write8;
546 dev_priv->uncore.funcs.mmio_writew = gen6_write16;
547 dev_priv->uncore.funcs.mmio_writel = gen6_write32;
548 dev_priv->uncore.funcs.mmio_writeq = gen6_write64;
550 dev_priv->uncore.funcs.mmio_readb = gen6_read8;
551 dev_priv->uncore.funcs.mmio_readw = gen6_read16;
552 dev_priv->uncore.funcs.mmio_readl = gen6_read32;
553 dev_priv->uncore.funcs.mmio_readq = gen6_read64;
556 dev_priv->uncore.funcs.mmio_writeb = gen5_write8;
557 dev_priv->uncore.funcs.mmio_writew = gen5_write16;
558 dev_priv->uncore.funcs.mmio_writel = gen5_write32;
559 dev_priv->uncore.funcs.mmio_writeq = gen5_write64;
560 dev_priv->uncore.funcs.mmio_readb = gen5_read8;
561 dev_priv->uncore.funcs.mmio_readw = gen5_read16;
562 dev_priv->uncore.funcs.mmio_readl = gen5_read32;
563 dev_priv->uncore.funcs.mmio_readq = gen5_read64;
568 dev_priv->uncore.funcs.mmio_writeb = gen4_write8;
569 dev_priv->uncore.funcs.mmio_writew = gen4_write16;
570 dev_priv->uncore.funcs.mmio_writel = gen4_write32;
571 dev_priv->uncore.funcs.mmio_writeq = gen4_write64;
572 dev_priv->uncore.funcs.mmio_readb = gen4_read8;
573 dev_priv->uncore.funcs.mmio_readw = gen4_read16;
574 dev_priv->uncore.funcs.mmio_readl = gen4_read32;
575 dev_priv->uncore.funcs.mmio_readq = gen4_read64;
580 void intel_uncore_fini(struct drm_device *dev)
582 struct drm_i915_private *dev_priv = dev->dev_private;
584 flush_delayed_work(&dev_priv->uncore.force_wake_work);
586 /* Paranoia: make sure we have disabled everything before we exit. */
587 intel_uncore_sanitize(dev);
590 static const struct register_whitelist {
593 uint32_t gen_bitmask; /* support gens, 0x10 for 4, 0x30 for 4 and 5, etc. */
595 { RING_TIMESTAMP(RENDER_RING_BASE), 8, 0xF0 },
598 int i915_reg_read_ioctl(struct drm_device *dev,
599 void *data, struct drm_file *file)
601 struct drm_i915_private *dev_priv = dev->dev_private;
602 struct drm_i915_reg_read *reg = data;
603 struct register_whitelist const *entry = whitelist;
606 for (i = 0; i < ARRAY_SIZE(whitelist); i++, entry++) {
607 if (entry->offset == reg->offset &&
608 (1 << INTEL_INFO(dev)->gen & entry->gen_bitmask))
612 if (i == ARRAY_SIZE(whitelist))
615 switch (entry->size) {
617 reg->val = I915_READ64(reg->offset);
620 reg->val = I915_READ(reg->offset);
623 reg->val = I915_READ16(reg->offset);
626 reg->val = I915_READ8(reg->offset);
636 static int i965_reset_complete(struct drm_device *dev)
639 pci_read_config_byte(dev->pdev, I965_GDRST, &gdrst);
640 return (gdrst & GRDOM_RESET_ENABLE) == 0;
643 static int i965_do_reset(struct drm_device *dev)
648 * Set the domains we want to reset (GRDOM/bits 2 and 3) as
649 * well as the reset bit (GR/bit 0). Setting the GR bit
650 * triggers the reset; when done, the hardware will clear it.
652 pci_write_config_byte(dev->pdev, I965_GDRST,
653 GRDOM_RENDER | GRDOM_RESET_ENABLE);
654 ret = wait_for(i965_reset_complete(dev), 500);
658 /* We can't reset render&media without also resetting display ... */
659 pci_write_config_byte(dev->pdev, I965_GDRST,
660 GRDOM_MEDIA | GRDOM_RESET_ENABLE);
662 ret = wait_for(i965_reset_complete(dev), 500);
666 pci_write_config_byte(dev->pdev, I965_GDRST, 0);
671 static int ironlake_do_reset(struct drm_device *dev)
673 struct drm_i915_private *dev_priv = dev->dev_private;
677 gdrst = I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR);
678 gdrst &= ~GRDOM_MASK;
679 I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR,
680 gdrst | GRDOM_RENDER | GRDOM_RESET_ENABLE);
681 ret = wait_for(I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) & 0x1, 500);
685 /* We can't reset render&media without also resetting display ... */
686 gdrst = I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR);
687 gdrst &= ~GRDOM_MASK;
688 I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR,
689 gdrst | GRDOM_MEDIA | GRDOM_RESET_ENABLE);
690 return wait_for(I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) & 0x1, 500);
693 static int gen6_do_reset(struct drm_device *dev)
695 struct drm_i915_private *dev_priv = dev->dev_private;
697 unsigned long irqflags;
699 /* Hold uncore.lock across reset to prevent any register access
700 * with forcewake not set correctly
702 spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
706 /* GEN6_GDRST is not in the gt power well, no need to check
707 * for fifo space for the write or forcewake the chip for
710 __raw_i915_write32(dev_priv, GEN6_GDRST, GEN6_GRDOM_FULL);
712 /* Spin waiting for the device to ack the reset request */
713 ret = wait_for((__raw_i915_read32(dev_priv, GEN6_GDRST) & GEN6_GRDOM_FULL) == 0, 500);
715 intel_uncore_forcewake_reset(dev);
717 /* If reset with a user forcewake, try to restore, otherwise turn it off */
718 if (dev_priv->uncore.forcewake_count)
719 dev_priv->uncore.funcs.force_wake_get(dev_priv);
721 dev_priv->uncore.funcs.force_wake_put(dev_priv);
723 /* Restore fifo count */
724 dev_priv->uncore.fifo_count = __raw_i915_read32(dev_priv, GT_FIFO_FREE_ENTRIES);
726 spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
730 int intel_gpu_reset(struct drm_device *dev)
732 switch (INTEL_INFO(dev)->gen) {
734 case 6: return gen6_do_reset(dev);
735 case 5: return ironlake_do_reset(dev);
736 case 4: return i965_do_reset(dev);
737 default: return -ENODEV;
741 void intel_uncore_clear_errors(struct drm_device *dev)
743 struct drm_i915_private *dev_priv = dev->dev_private;
745 /* XXX needs spinlock around caller's grouping */
746 if (HAS_FPGA_DBG_UNCLAIMED(dev))
747 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
750 void intel_uncore_check_errors(struct drm_device *dev)
752 struct drm_i915_private *dev_priv = dev->dev_private;
754 if (HAS_FPGA_DBG_UNCLAIMED(dev) &&
755 (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM)) {
756 DRM_ERROR("Unclaimed register before interrupt\n");
757 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);