drivers/gpu/drm/i915/intel_uncore.h

   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
  35 struct drm_i915_private;
  36 struct intel_runtime_pm;
  37 struct intel_uncore;
  38
  39 struct intel_uncore_mmio_debug {
  40         spinlock_t lock; /** lock is also taken in irq contexts. */
  41         int unclaimed_mmio_check;
  42         int saved_mmio_check;
  43         u32 suspend_count;
  44 };
  45
  46 enum forcewake_domain_id {
  47         FW_DOMAIN_ID_RENDER = 0,
  48         FW_DOMAIN_ID_BLITTER,
  49         FW_DOMAIN_ID_MEDIA,
  50         FW_DOMAIN_ID_MEDIA_VDBOX0,
  51         FW_DOMAIN_ID_MEDIA_VDBOX1,
  52         FW_DOMAIN_ID_MEDIA_VDBOX2,
  53         FW_DOMAIN_ID_MEDIA_VDBOX3,
  54         FW_DOMAIN_ID_MEDIA_VEBOX0,
  55         FW_DOMAIN_ID_MEDIA_VEBOX1,
  56
  57         FW_DOMAIN_ID_COUNT
  58 };
  59
  60 enum forcewake_domains {
  61         FORCEWAKE_RENDER        = BIT(FW_DOMAIN_ID_RENDER),
  62         FORCEWAKE_BLITTER       = BIT(FW_DOMAIN_ID_BLITTER),
  63         FORCEWAKE_MEDIA         = BIT(FW_DOMAIN_ID_MEDIA),
  64         FORCEWAKE_MEDIA_VDBOX0  = BIT(FW_DOMAIN_ID_MEDIA_VDBOX0),
  65         FORCEWAKE_MEDIA_VDBOX1  = BIT(FW_DOMAIN_ID_MEDIA_VDBOX1),
  66         FORCEWAKE_MEDIA_VDBOX2  = BIT(FW_DOMAIN_ID_MEDIA_VDBOX2),
  67         FORCEWAKE_MEDIA_VDBOX3  = BIT(FW_DOMAIN_ID_MEDIA_VDBOX3),
  68         FORCEWAKE_MEDIA_VEBOX0  = BIT(FW_DOMAIN_ID_MEDIA_VEBOX0),
  69         FORCEWAKE_MEDIA_VEBOX1  = BIT(FW_DOMAIN_ID_MEDIA_VEBOX1),
  70
  71         FORCEWAKE_ALL = BIT(FW_DOMAIN_ID_COUNT) - 1
  72 };
  73
  74 struct intel_uncore_funcs {
  75         void (*force_wake_get)(struct intel_uncore *uncore,
  76                                enum forcewake_domains domains);
  77         void (*force_wake_put)(struct intel_uncore *uncore,
  78                                enum forcewake_domains domains);
  79
  80         enum forcewake_domains (*read_fw_domains)(struct intel_uncore *uncore,
  81                                                   i915_reg_t r);
  82         enum forcewake_domains (*write_fw_domains)(struct intel_uncore *uncore,
  83                                                    i915_reg_t r);
  84
  85         u8 (*mmio_readb)(struct intel_uncore *uncore,
  86                          i915_reg_t r, bool trace);
  87         u16 (*mmio_readw)(struct intel_uncore *uncore,
  88                           i915_reg_t r, bool trace);
  89         u32 (*mmio_readl)(struct intel_uncore *uncore,
  90                           i915_reg_t r, bool trace);
  91         u64 (*mmio_readq)(struct intel_uncore *uncore,
  92                           i915_reg_t r, bool trace);
  93
  94         void (*mmio_writeb)(struct intel_uncore *uncore,
  95                             i915_reg_t r, u8 val, bool trace);
  96         void (*mmio_writew)(struct intel_uncore *uncore,
  97                             i915_reg_t r, u16 val, bool trace);
  98         void (*mmio_writel)(struct intel_uncore *uncore,
  99                             i915_reg_t r, u32 val, bool trace);
 100 };
 101
 102 struct intel_forcewake_range {
 103         u32 start;
 104         u32 end;
 105
 106         enum forcewake_domains domains;
 107 };
 108
 109 struct intel_uncore {
 110         void __iomem *regs;
 111
 112         struct drm_i915_private *i915;
 113         struct intel_runtime_pm *rpm;
 114
 115         spinlock_t lock; /** lock is also taken in irq contexts. */
 116
 117         unsigned int flags;
 118 #define UNCORE_HAS_FORCEWAKE            BIT(0)
 119 #define UNCORE_HAS_FPGA_DBG_UNCLAIMED   BIT(1)
 120 #define UNCORE_HAS_DBG_UNCLAIMED        BIT(2)
 121 #define UNCORE_HAS_FIFO                 BIT(3)
 122
 123         const struct intel_forcewake_range *fw_domains_table;
 124         unsigned int fw_domains_table_entries;
 125
 126         struct notifier_block pmic_bus_access_nb;
 127         struct intel_uncore_funcs funcs;
 128
 129         unsigned int fifo_count;
 130
 131         enum forcewake_domains fw_domains;
 132         enum forcewake_domains fw_domains_active;
 133         enum forcewake_domains fw_domains_timer;
 134         enum forcewake_domains fw_domains_saved; /* user domains saved for S3 */
 135
 136         struct intel_uncore_forcewake_domain {
 137                 struct intel_uncore *uncore;
 138                 enum forcewake_domain_id id;
 139                 enum forcewake_domains mask;
 140                 unsigned int wake_count;
 141                 bool active;
 142                 struct hrtimer timer;
 143                 u32 __iomem *reg_set;
 144                 u32 __iomem *reg_ack;
 145         } *fw_domain[FW_DOMAIN_ID_COUNT];
 146
 147         unsigned int user_forcewake_count;
 148
 149         struct intel_uncore_mmio_debug *debug;
 150 };
 151
 152 /* Iterate over initialised fw domains */
 153 #define for_each_fw_domain_masked(domain__, mask__, uncore__, tmp__) \
 154         for (tmp__ = (mask__); tmp__ ;) \
 155                 for_each_if(domain__ = (uncore__)->fw_domain[__mask_next_bit(tmp__)])
 156
 157 #define for_each_fw_domain(domain__, uncore__, tmp__) \
 158         for_each_fw_domain_masked(domain__, (uncore__)->fw_domains, uncore__, tmp__)
 159
 160 static inline bool
 161 intel_uncore_has_forcewake(const struct intel_uncore *uncore)
 162 {
 163         return uncore->flags & UNCORE_HAS_FORCEWAKE;
 164 }
 165
 166 static inline bool
 167 intel_uncore_has_fpga_dbg_unclaimed(const struct intel_uncore *uncore)
 168 {
 169         return uncore->flags & UNCORE_HAS_FPGA_DBG_UNCLAIMED;
 170 }
 171
 172 static inline bool
 173 intel_uncore_has_dbg_unclaimed(const struct intel_uncore *uncore)
 174 {
 175         return uncore->flags & UNCORE_HAS_DBG_UNCLAIMED;
 176 }
 177
 178 static inline bool
 179 intel_uncore_has_fifo(const struct intel_uncore *uncore)
 180 {
 181         return uncore->flags & UNCORE_HAS_FIFO;
 182 }
 183
 184 void
 185 intel_uncore_mmio_debug_init_early(struct intel_uncore_mmio_debug *mmio_debug);
 186 void intel_uncore_init_early(struct intel_uncore *uncore,
 187                              struct drm_i915_private *i915);
 188 int intel_uncore_init_mmio(struct intel_uncore *uncore);
 189 void intel_uncore_prune_mmio_domains(struct intel_uncore *uncore);
 190 bool intel_uncore_unclaimed_mmio(struct intel_uncore *uncore);
 191 bool intel_uncore_arm_unclaimed_mmio_detection(struct intel_uncore *uncore);
 192 void intel_uncore_fini_mmio(struct intel_uncore *uncore);
 193 void intel_uncore_suspend(struct intel_uncore *uncore);
 194 void intel_uncore_resume_early(struct intel_uncore *uncore);
 195 void intel_uncore_runtime_resume(struct intel_uncore *uncore);
 196
 197 void assert_forcewakes_inactive(struct intel_uncore *uncore);
 198 void assert_forcewakes_active(struct intel_uncore *uncore,
 199                               enum forcewake_domains fw_domains);
 200 const char *intel_uncore_forcewake_domain_to_str(const enum forcewake_domain_id id);
 201
 202 enum forcewake_domains
 203 intel_uncore_forcewake_for_reg(struct intel_uncore *uncore,
 204                                i915_reg_t reg, unsigned int op);
 205 #define FW_REG_READ  (1)
 206 #define FW_REG_WRITE (2)
 207
 208 void intel_uncore_forcewake_get(struct intel_uncore *uncore,
 209                                 enum forcewake_domains domains);
 210 void intel_uncore_forcewake_put(struct intel_uncore *uncore,
 211                                 enum forcewake_domains domains);
 212 /* Like above but the caller must manage the uncore.lock itself.
 213  * Must be used with I915_READ_FW and friends.
 214  */
 215 void intel_uncore_forcewake_get__locked(struct intel_uncore *uncore,
 216                                         enum forcewake_domains domains);
 217 void intel_uncore_forcewake_put__locked(struct intel_uncore *uncore,
 218                                         enum forcewake_domains domains);
 219
 220 void intel_uncore_forcewake_user_get(struct intel_uncore *uncore);
 221 void intel_uncore_forcewake_user_put(struct intel_uncore *uncore);
 222
 223 int __intel_wait_for_register(struct intel_uncore *uncore,
 224                               i915_reg_t reg,
 225                               u32 mask,
 226                               u32 value,
 227                               unsigned int fast_timeout_us,
 228                               unsigned int slow_timeout_ms,
 229                               u32 *out_value);
 230 static inline int
 231 intel_wait_for_register(struct intel_uncore *uncore,
 232                         i915_reg_t reg,
 233                         u32 mask,
 234                         u32 value,
 235                         unsigned int timeout_ms)
 236 {
 237         return __intel_wait_for_register(uncore, reg, mask, value, 2,
 238                                          timeout_ms, NULL);
 239 }
 240
 241 int __intel_wait_for_register_fw(struct intel_uncore *uncore,
 242                                  i915_reg_t reg,
 243                                  u32 mask,
 244                                  u32 value,
 245                                  unsigned int fast_timeout_us,
 246                                  unsigned int slow_timeout_ms,
 247                                  u32 *out_value);
 248 static inline int
 249 intel_wait_for_register_fw(struct intel_uncore *uncore,
 250                            i915_reg_t reg,
 251                            u32 mask,
 252                            u32 value,
 253                                unsigned int timeout_ms)
 254 {
 255         return __intel_wait_for_register_fw(uncore, reg, mask, value,
 256                                             2, timeout_ms, NULL);
 257 }
 258
 259 /* register access functions */
 260 #define __raw_read(x__, s__) \
 261 static inline u##x__ __raw_uncore_read##x__(const struct intel_uncore *uncore, \
 262                                             i915_reg_t reg) \
 263 { \
 264         return read##s__(uncore->regs + i915_mmio_reg_offset(reg)); \
 265 }
 266
 267 #define __raw_write(x__, s__) \
 268 static inline void __raw_uncore_write##x__(const struct intel_uncore *uncore, \
 269                                            i915_reg_t reg, u##x__ val) \
 270 { \
 271         write##s__(val, uncore->regs + i915_mmio_reg_offset(reg)); \
 272 }
 273 __raw_read(8, b)
 274 __raw_read(16, w)
 275 __raw_read(32, l)
 276 __raw_read(64, q)
 277
 278 __raw_write(8, b)
 279 __raw_write(16, w)
 280 __raw_write(32, l)
 281 __raw_write(64, q)
 282
 283 #undef __raw_read
 284 #undef __raw_write
 285
 286 #define __uncore_read(name__, x__, s__, trace__) \
 287 static inline u##x__ intel_uncore_##name__(struct intel_uncore *uncore, \
 288                                            i915_reg_t reg) \
 289 { \
 290         return uncore->funcs.mmio_read##s__(uncore, reg, (trace__)); \
 291 }
 292
 293 #define __uncore_write(name__, x__, s__, trace__) \
 294 static inline void intel_uncore_##name__(struct intel_uncore *uncore, \
 295                                          i915_reg_t reg, u##x__ val) \
 296 { \
 297         uncore->funcs.mmio_write##s__(uncore, reg, val, (trace__)); \
 298 }
 299
 300 __uncore_read(read8, 8, b, true)
 301 __uncore_read(read16, 16, w, true)
 302 __uncore_read(read, 32, l, true)
 303 __uncore_read(read16_notrace, 16, w, false)
 304 __uncore_read(read_notrace, 32, l, false)
 305
 306 __uncore_write(write8, 8, b, true)
 307 __uncore_write(write16, 16, w, true)
 308 __uncore_write(write, 32, l, true)
 309 __uncore_write(write_notrace, 32, l, false)
 310
 311 /* Be very careful with read/write 64-bit values. On 32-bit machines, they
 312  * will be implemented using 2 32-bit writes in an arbitrary order with
 313  * an arbitrary delay between them. This can cause the hardware to
 314  * act upon the intermediate value, possibly leading to corruption and
 315  * machine death. For this reason we do not support I915_WRITE64, or
 316  * uncore->funcs.mmio_writeq.
 317  *
 318  * When reading a 64-bit value as two 32-bit values, the delay may cause
 319  * the two reads to mismatch, e.g. a timestamp overflowing. Also note that
 320  * occasionally a 64-bit register does not actually support a full readq
 321  * and must be read using two 32-bit reads.
 322  *
 323  * You have been warned.
 324  */
 325 __uncore_read(read64, 64, q, true)
 326
 327 static inline u64
 328 intel_uncore_read64_2x32(struct intel_uncore *uncore,
 329                          i915_reg_t lower_reg, i915_reg_t upper_reg)
 330 {
 331         u32 upper, lower, old_upper, loop = 0;
 332         upper = intel_uncore_read(uncore, upper_reg);
 333         do {
 334                 old_upper = upper;
 335                 lower = intel_uncore_read(uncore, lower_reg);
 336                 upper = intel_uncore_read(uncore, upper_reg);
 337         } while (upper != old_upper && loop++ < 2);
 338         return (u64)upper << 32 | lower;
 339 }
 340
 341 #define intel_uncore_posting_read(...) ((void)intel_uncore_read_notrace(__VA_ARGS__))
 342 #define intel_uncore_posting_read16(...) ((void)intel_uncore_read16_notrace(__VA_ARGS__))
 343
 344 #undef __uncore_read
 345 #undef __uncore_write
 346
 347 /* These are untraced mmio-accessors that are only valid to be used inside
 348  * critical sections, such as inside IRQ handlers, where forcewake is explicitly
 349  * controlled.
 350  *
 351  * Think twice, and think again, before using these.
 352  *
 353  * As an example, these accessors can possibly be used between:
 354  *
 355  * spin_lock_irq(&uncore->lock);
 356  * intel_uncore_forcewake_get__locked();
 357  *
 358  * and
 359  *
 360  * intel_uncore_forcewake_put__locked();
 361  * spin_unlock_irq(&uncore->lock);
 362  *
 363  *
 364  * Note: some registers may not need forcewake held, so
 365  * intel_uncore_forcewake_{get,put} can be omitted, see
 366  * intel_uncore_forcewake_for_reg().
 367  *
 368  * Certain architectures will die if the same cacheline is concurrently accessed
 369  * by different clients (e.g. on Ivybridge). Access to registers should
 370  * therefore generally be serialised, by either the dev_priv->uncore.lock or
 371  * a more localised lock guarding all access to that bank of registers.
 372  */
 373 #define intel_uncore_read_fw(...) __raw_uncore_read32(__VA_ARGS__)
 374 #define intel_uncore_write_fw(...) __raw_uncore_write32(__VA_ARGS__)
 375 #define intel_uncore_write64_fw(...) __raw_uncore_write64(__VA_ARGS__)
 376 #define intel_uncore_posting_read_fw(...) ((void)intel_uncore_read_fw(__VA_ARGS__))
 377
 378 static inline void intel_uncore_rmw(struct intel_uncore *uncore,
 379                                     i915_reg_t reg, u32 clear, u32 set)
 380 {
 381         u32 old, val;
 382
 383         old = intel_uncore_read(uncore, reg);
 384         val = (old & ~clear) | set;
 385         if (val != old)
 386                 intel_uncore_write(uncore, reg, val);
 387 }
 388
 389 static inline void intel_uncore_rmw_fw(struct intel_uncore *uncore,
 390                                        i915_reg_t reg, u32 clear, u32 set)
 391 {
 392         u32 old, val;
 393
 394         old = intel_uncore_read_fw(uncore, reg);
 395         val = (old & ~clear) | set;
 396         if (val != old)
 397                 intel_uncore_write_fw(uncore, reg, val);
 398 }
 399
 400 static inline int intel_uncore_write_and_verify(struct intel_uncore *uncore,
 401                                                 i915_reg_t reg, u32 val,
 402                                                 u32 mask, u32 expected_val)
 403 {
 404         u32 reg_val;
 405
 406         intel_uncore_write(uncore, reg, val);
 407         reg_val = intel_uncore_read(uncore, reg);
 408
 409         return (reg_val & mask) != expected_val ? -EINVAL : 0;
 410 }
 411
 412 #define raw_reg_read(base, reg) \
 413         readl(base + i915_mmio_reg_offset(reg))
 414 #define raw_reg_write(base, reg, value) \
 415         writel(value, base + i915_mmio_reg_offset(reg))
 416
 417 #endif /* !__INTEL_UNCORE_H__ */