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1/*
2 * Copyright © 2017 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#ifndef __INTEL_UNCORE_H__
26#define __INTEL_UNCORE_H__
27
28#include <linux/spinlock.h>
29#include <linux/notifier.h>
30#include <linux/hrtimer.h>
31#include <linux/io-64-nonatomic-lo-hi.h>
32
33#include "i915_reg.h"
34
35struct drm_i915_private;
36struct intel_runtime_pm;
37struct intel_uncore;
38struct intel_gt;
39
40struct intel_uncore_mmio_debug {
41 spinlock_t lock; /** lock is also taken in irq contexts. */
42 int unclaimed_mmio_check;
43 int saved_mmio_check;
44 u32 suspend_count;
45};
46
47enum forcewake_domain_id {
48 FW_DOMAIN_ID_RENDER = 0,
49 FW_DOMAIN_ID_GT, /* also includes blitter engine */
50 FW_DOMAIN_ID_MEDIA,
51 FW_DOMAIN_ID_MEDIA_VDBOX0,
52 FW_DOMAIN_ID_MEDIA_VDBOX1,
53 FW_DOMAIN_ID_MEDIA_VDBOX2,
54 FW_DOMAIN_ID_MEDIA_VDBOX3,
55 FW_DOMAIN_ID_MEDIA_VEBOX0,
56 FW_DOMAIN_ID_MEDIA_VEBOX1,
57
58 FW_DOMAIN_ID_COUNT
59};
60
61enum forcewake_domains {
62 FORCEWAKE_RENDER = BIT(FW_DOMAIN_ID_RENDER),
63 FORCEWAKE_GT = BIT(FW_DOMAIN_ID_GT),
64 FORCEWAKE_MEDIA = BIT(FW_DOMAIN_ID_MEDIA),
65 FORCEWAKE_MEDIA_VDBOX0 = BIT(FW_DOMAIN_ID_MEDIA_VDBOX0),
66 FORCEWAKE_MEDIA_VDBOX1 = BIT(FW_DOMAIN_ID_MEDIA_VDBOX1),
67 FORCEWAKE_MEDIA_VDBOX2 = BIT(FW_DOMAIN_ID_MEDIA_VDBOX2),
68 FORCEWAKE_MEDIA_VDBOX3 = BIT(FW_DOMAIN_ID_MEDIA_VDBOX3),
69 FORCEWAKE_MEDIA_VEBOX0 = BIT(FW_DOMAIN_ID_MEDIA_VEBOX0),
70 FORCEWAKE_MEDIA_VEBOX1 = BIT(FW_DOMAIN_ID_MEDIA_VEBOX1),
71
72 FORCEWAKE_ALL = BIT(FW_DOMAIN_ID_COUNT) - 1
73};
74
75struct intel_uncore_funcs {
76 void (*force_wake_get)(struct intel_uncore *uncore,
77 enum forcewake_domains domains);
78 void (*force_wake_put)(struct intel_uncore *uncore,
79 enum forcewake_domains domains);
80
81 enum forcewake_domains (*read_fw_domains)(struct intel_uncore *uncore,
82 i915_reg_t r);
83 enum forcewake_domains (*write_fw_domains)(struct intel_uncore *uncore,
84 i915_reg_t r);
85
86 u8 (*mmio_readb)(struct intel_uncore *uncore,
87 i915_reg_t r, bool trace);
88 u16 (*mmio_readw)(struct intel_uncore *uncore,
89 i915_reg_t r, bool trace);
90 u32 (*mmio_readl)(struct intel_uncore *uncore,
91 i915_reg_t r, bool trace);
92 u64 (*mmio_readq)(struct intel_uncore *uncore,
93 i915_reg_t r, bool trace);
94
95 void (*mmio_writeb)(struct intel_uncore *uncore,
96 i915_reg_t r, u8 val, bool trace);
97 void (*mmio_writew)(struct intel_uncore *uncore,
98 i915_reg_t r, u16 val, bool trace);
99 void (*mmio_writel)(struct intel_uncore *uncore,
100 i915_reg_t r, u32 val, bool trace);
101};
102
103struct intel_forcewake_range {
104 u32 start;
105 u32 end;
106
107 enum forcewake_domains domains;
108};
109
110struct intel_uncore {
111 void __iomem *regs;
112
113 struct drm_i915_private *i915;
114 struct intel_runtime_pm *rpm;
115
116 spinlock_t lock; /** lock is also taken in irq contexts. */
117
118 unsigned int flags;
119#define UNCORE_HAS_FORCEWAKE BIT(0)
120#define UNCORE_HAS_FPGA_DBG_UNCLAIMED BIT(1)
121#define UNCORE_HAS_DBG_UNCLAIMED BIT(2)
122#define UNCORE_HAS_FIFO BIT(3)
123
124 const struct intel_forcewake_range *fw_domains_table;
125 unsigned int fw_domains_table_entries;
126
127 struct notifier_block pmic_bus_access_nb;
128 struct intel_uncore_funcs funcs;
129
130 unsigned int fifo_count;
131
132 enum forcewake_domains fw_domains;
133 enum forcewake_domains fw_domains_active;
134 enum forcewake_domains fw_domains_timer;
135 enum forcewake_domains fw_domains_saved; /* user domains saved for S3 */
136
137 struct intel_uncore_forcewake_domain {
138 struct intel_uncore *uncore;
139 enum forcewake_domain_id id;
140 enum forcewake_domains mask;
141 unsigned int wake_count;
142 bool active;
143 struct hrtimer timer;
144 u32 __iomem *reg_set;
145 u32 __iomem *reg_ack;
146 } *fw_domain[FW_DOMAIN_ID_COUNT];
147
148 unsigned int user_forcewake_count;
149
150 struct intel_uncore_mmio_debug *debug;
151};
152
153/* Iterate over initialised fw domains */
154#define for_each_fw_domain_masked(domain__, mask__, uncore__, tmp__) \
155 for (tmp__ = (mask__); tmp__ ;) \
156 for_each_if(domain__ = (uncore__)->fw_domain[__mask_next_bit(tmp__)])
157
158#define for_each_fw_domain(domain__, uncore__, tmp__) \
159 for_each_fw_domain_masked(domain__, (uncore__)->fw_domains, uncore__, tmp__)
160
161static inline bool
162intel_uncore_has_forcewake(const struct intel_uncore *uncore)
163{
164 return uncore->flags & UNCORE_HAS_FORCEWAKE;
165}
166
167static inline bool
168intel_uncore_has_fpga_dbg_unclaimed(const struct intel_uncore *uncore)
169{
170 return uncore->flags & UNCORE_HAS_FPGA_DBG_UNCLAIMED;
171}
172
173static inline bool
174intel_uncore_has_dbg_unclaimed(const struct intel_uncore *uncore)
175{
176 return uncore->flags & UNCORE_HAS_DBG_UNCLAIMED;
177}
178
179static inline bool
180intel_uncore_has_fifo(const struct intel_uncore *uncore)
181{
182 return uncore->flags & UNCORE_HAS_FIFO;
183}
184
185void
186intel_uncore_mmio_debug_init_early(struct intel_uncore_mmio_debug *mmio_debug);
187void intel_uncore_init_early(struct intel_uncore *uncore,
188 struct drm_i915_private *i915);
189int intel_uncore_init_mmio(struct intel_uncore *uncore);
190void intel_uncore_prune_engine_fw_domains(struct intel_uncore *uncore,
191 struct intel_gt *gt);
192bool intel_uncore_unclaimed_mmio(struct intel_uncore *uncore);
193bool intel_uncore_arm_unclaimed_mmio_detection(struct intel_uncore *uncore);
194void intel_uncore_fini_mmio(struct intel_uncore *uncore);
195void intel_uncore_suspend(struct intel_uncore *uncore);
196void intel_uncore_resume_early(struct intel_uncore *uncore);
197void intel_uncore_runtime_resume(struct intel_uncore *uncore);
198
199void assert_forcewakes_inactive(struct intel_uncore *uncore);
200void assert_forcewakes_active(struct intel_uncore *uncore,
201 enum forcewake_domains fw_domains);
202const char *intel_uncore_forcewake_domain_to_str(const enum forcewake_domain_id id);
203
204enum forcewake_domains
205intel_uncore_forcewake_for_reg(struct intel_uncore *uncore,
206 i915_reg_t reg, unsigned int op);
207#define FW_REG_READ (1)
208#define FW_REG_WRITE (2)
209
210void intel_uncore_forcewake_get(struct intel_uncore *uncore,
211 enum forcewake_domains domains);
212void intel_uncore_forcewake_put(struct intel_uncore *uncore,
213 enum forcewake_domains domains);
214void intel_uncore_forcewake_flush(struct intel_uncore *uncore,
215 enum forcewake_domains fw_domains);
216
217/*
218 * Like above but the caller must manage the uncore.lock itself.
219 * Must be used with intel_uncore_read_fw() and friends.
220 */
221void intel_uncore_forcewake_get__locked(struct intel_uncore *uncore,
222 enum forcewake_domains domains);
223void intel_uncore_forcewake_put__locked(struct intel_uncore *uncore,
224 enum forcewake_domains domains);
225
226void intel_uncore_forcewake_user_get(struct intel_uncore *uncore);
227void intel_uncore_forcewake_user_put(struct intel_uncore *uncore);
228
229int __intel_wait_for_register(struct intel_uncore *uncore,
230 i915_reg_t reg,
231 u32 mask,
232 u32 value,
233 unsigned int fast_timeout_us,
234 unsigned int slow_timeout_ms,
235 u32 *out_value);
236static inline int
237intel_wait_for_register(struct intel_uncore *uncore,
238 i915_reg_t reg,
239 u32 mask,
240 u32 value,
241 unsigned int timeout_ms)
242{
243 return __intel_wait_for_register(uncore, reg, mask, value, 2,
244 timeout_ms, NULL);
245}
246
247int __intel_wait_for_register_fw(struct intel_uncore *uncore,
248 i915_reg_t reg,
249 u32 mask,
250 u32 value,
251 unsigned int fast_timeout_us,
252 unsigned int slow_timeout_ms,
253 u32 *out_value);
254static inline int
255intel_wait_for_register_fw(struct intel_uncore *uncore,
256 i915_reg_t reg,
257 u32 mask,
258 u32 value,
259 unsigned int timeout_ms)
260{
261 return __intel_wait_for_register_fw(uncore, reg, mask, value,
262 2, timeout_ms, NULL);
263}
264
265/* register access functions */
266#define __raw_read(x__, s__) \
267static inline u##x__ __raw_uncore_read##x__(const struct intel_uncore *uncore, \
268 i915_reg_t reg) \
269{ \
270 return read##s__(uncore->regs + i915_mmio_reg_offset(reg)); \
271}
272
273#define __raw_write(x__, s__) \
274static inline void __raw_uncore_write##x__(const struct intel_uncore *uncore, \
275 i915_reg_t reg, u##x__ val) \
276{ \
277 write##s__(val, uncore->regs + i915_mmio_reg_offset(reg)); \
278}
279__raw_read(8, b)
280__raw_read(16, w)
281__raw_read(32, l)
282__raw_read(64, q)
283
284__raw_write(8, b)
285__raw_write(16, w)
286__raw_write(32, l)
287__raw_write(64, q)
288
289#undef __raw_read
290#undef __raw_write
291
292#define __uncore_read(name__, x__, s__, trace__) \
293static inline u##x__ intel_uncore_##name__(struct intel_uncore *uncore, \
294 i915_reg_t reg) \
295{ \
296 return uncore->funcs.mmio_read##s__(uncore, reg, (trace__)); \
297}
298
299#define __uncore_write(name__, x__, s__, trace__) \
300static inline void intel_uncore_##name__(struct intel_uncore *uncore, \
301 i915_reg_t reg, u##x__ val) \
302{ \
303 uncore->funcs.mmio_write##s__(uncore, reg, val, (trace__)); \
304}
305
306__uncore_read(read8, 8, b, true)
307__uncore_read(read16, 16, w, true)
308__uncore_read(read, 32, l, true)
309__uncore_read(read16_notrace, 16, w, false)
310__uncore_read(read_notrace, 32, l, false)
311
312__uncore_write(write8, 8, b, true)
313__uncore_write(write16, 16, w, true)
314__uncore_write(write, 32, l, true)
315__uncore_write(write_notrace, 32, l, false)
316
317/* Be very careful with read/write 64-bit values. On 32-bit machines, they
318 * will be implemented using 2 32-bit writes in an arbitrary order with
319 * an arbitrary delay between them. This can cause the hardware to
320 * act upon the intermediate value, possibly leading to corruption and
321 * machine death. For this reason we do not support intel_uncore_write64,
322 * or uncore->funcs.mmio_writeq.
323 *
324 * When reading a 64-bit value as two 32-bit values, the delay may cause
325 * the two reads to mismatch, e.g. a timestamp overflowing. Also note that
326 * occasionally a 64-bit register does not actually support a full readq
327 * and must be read using two 32-bit reads.
328 *
329 * You have been warned.
330 */
331__uncore_read(read64, 64, q, true)
332
333static inline u64
334intel_uncore_read64_2x32(struct intel_uncore *uncore,
335 i915_reg_t lower_reg, i915_reg_t upper_reg)
336{
337 u32 upper, lower, old_upper, loop = 0;
338 upper = intel_uncore_read(uncore, upper_reg);
339 do {
340 old_upper = upper;
341 lower = intel_uncore_read(uncore, lower_reg);
342 upper = intel_uncore_read(uncore, upper_reg);
343 } while (upper != old_upper && loop++ < 2);
344 return (u64)upper << 32 | lower;
345}
346
347#define intel_uncore_posting_read(...) ((void)intel_uncore_read_notrace(__VA_ARGS__))
348#define intel_uncore_posting_read16(...) ((void)intel_uncore_read16_notrace(__VA_ARGS__))
349
350#undef __uncore_read
351#undef __uncore_write
352
353/* These are untraced mmio-accessors that are only valid to be used inside
354 * critical sections, such as inside IRQ handlers, where forcewake is explicitly
355 * controlled.
356 *
357 * Think twice, and think again, before using these.
358 *
359 * As an example, these accessors can possibly be used between:
360 *
361 * spin_lock_irq(&uncore->lock);
362 * intel_uncore_forcewake_get__locked();
363 *
364 * and
365 *
366 * intel_uncore_forcewake_put__locked();
367 * spin_unlock_irq(&uncore->lock);
368 *
369 *
370 * Note: some registers may not need forcewake held, so
371 * intel_uncore_forcewake_{get,put} can be omitted, see
372 * intel_uncore_forcewake_for_reg().
373 *
374 * Certain architectures will die if the same cacheline is concurrently accessed
375 * by different clients (e.g. on Ivybridge). Access to registers should
376 * therefore generally be serialised, by either the dev_priv->uncore.lock or
377 * a more localised lock guarding all access to that bank of registers.
378 */
379#define intel_uncore_read_fw(...) __raw_uncore_read32(__VA_ARGS__)
380#define intel_uncore_write_fw(...) __raw_uncore_write32(__VA_ARGS__)
381#define intel_uncore_write64_fw(...) __raw_uncore_write64(__VA_ARGS__)
382#define intel_uncore_posting_read_fw(...) ((void)intel_uncore_read_fw(__VA_ARGS__))
383
384static inline void intel_uncore_rmw(struct intel_uncore *uncore,
385 i915_reg_t reg, u32 clear, u32 set)
386{
387 u32 old, val;
388
389 old = intel_uncore_read(uncore, reg);
390 val = (old & ~clear) | set;
391 if (val != old)
392 intel_uncore_write(uncore, reg, val);
393}
394
395static inline void intel_uncore_rmw_fw(struct intel_uncore *uncore,
396 i915_reg_t reg, u32 clear, u32 set)
397{
398 u32 old, val;
399
400 old = intel_uncore_read_fw(uncore, reg);
401 val = (old & ~clear) | set;
402 if (val != old)
403 intel_uncore_write_fw(uncore, reg, val);
404}
405
406static inline int intel_uncore_write_and_verify(struct intel_uncore *uncore,
407 i915_reg_t reg, u32 val,
408 u32 mask, u32 expected_val)
409{
410 u32 reg_val;
411
412 intel_uncore_write(uncore, reg, val);
413 reg_val = intel_uncore_read(uncore, reg);
414
415 return (reg_val & mask) != expected_val ? -EINVAL : 0;
416}
417
418#define raw_reg_read(base, reg) \
419 readl(base + i915_mmio_reg_offset(reg))
420#define raw_reg_write(base, reg, value) \
421 writel(value, base + i915_mmio_reg_offset(reg))
422
423#endif /* !__INTEL_UNCORE_H__ */