/* * Copyright © 2013 Intel Corporation * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. */ #include "i915_drv.h" #include "intel_drv.h" #include "i915_vgpu.h" #include #define FORCEWAKE_ACK_TIMEOUT_MS 2 #define __raw_i915_read8(dev_priv__, reg__) readb((dev_priv__)->regs + (reg__)) #define __raw_i915_write8(dev_priv__, reg__, val__) writeb(val__, (dev_priv__)->regs + (reg__)) #define __raw_i915_read16(dev_priv__, reg__) readw((dev_priv__)->regs + (reg__)) #define __raw_i915_write16(dev_priv__, reg__, val__) writew(val__, (dev_priv__)->regs + (reg__)) #define __raw_i915_read32(dev_priv__, reg__) readl((dev_priv__)->regs + (reg__)) #define __raw_i915_write32(dev_priv__, reg__, val__) writel(val__, (dev_priv__)->regs + (reg__)) #define __raw_i915_read64(dev_priv__, reg__) readq((dev_priv__)->regs + (reg__)) #define __raw_i915_write64(dev_priv__, reg__, val__) writeq(val__, (dev_priv__)->regs + (reg__)) #define __raw_posting_read(dev_priv__, reg__) (void)__raw_i915_read32(dev_priv__, reg__) static const char * const forcewake_domain_names[] = { "render", "blitter", "media", }; const char * intel_uncore_forcewake_domain_to_str(const enum forcewake_domain_id id) { BUILD_BUG_ON((sizeof(forcewake_domain_names)/sizeof(const char *)) != FW_DOMAIN_ID_COUNT); if (id >= 0 && id < FW_DOMAIN_ID_COUNT) return forcewake_domain_names[id]; WARN_ON(id); return "unknown"; } static void assert_device_not_suspended(struct drm_i915_private *dev_priv) { WARN_ONCE(HAS_RUNTIME_PM(dev_priv->dev) && dev_priv->pm.suspended, "Device suspended\n"); } static inline void fw_domain_reset(const struct intel_uncore_forcewake_domain *d) { WARN_ON(d->reg_set == 0); __raw_i915_write32(d->i915, d->reg_set, d->val_reset); } static inline void fw_domain_arm_timer(struct intel_uncore_forcewake_domain *d) { mod_timer_pinned(&d->timer, jiffies + 1); } static inline void fw_domain_wait_ack_clear(const struct intel_uncore_forcewake_domain *d) { if (wait_for_atomic((__raw_i915_read32(d->i915, d->reg_ack) & FORCEWAKE_KERNEL) == 0, FORCEWAKE_ACK_TIMEOUT_MS)) DRM_ERROR("%s: timed out waiting for forcewake ack to clear.\n", intel_uncore_forcewake_domain_to_str(d->id)); } static inline void fw_domain_get(const struct intel_uncore_forcewake_domain *d) { __raw_i915_write32(d->i915, d->reg_set, d->val_set); } static inline void fw_domain_wait_ack(const struct intel_uncore_forcewake_domain *d) { if (wait_for_atomic((__raw_i915_read32(d->i915, d->reg_ack) & FORCEWAKE_KERNEL), FORCEWAKE_ACK_TIMEOUT_MS)) DRM_ERROR("%s: timed out waiting for forcewake ack request.\n", intel_uncore_forcewake_domain_to_str(d->id)); } static inline void fw_domain_put(const struct intel_uncore_forcewake_domain *d) { __raw_i915_write32(d->i915, d->reg_set, d->val_clear); } static inline void fw_domain_posting_read(const struct intel_uncore_forcewake_domain *d) { /* something from same cacheline, but not from the set register */ if (d->reg_post) __raw_posting_read(d->i915, d->reg_post); } static void fw_domains_get(struct drm_i915_private *dev_priv, enum forcewake_domains fw_domains) { struct intel_uncore_forcewake_domain *d; enum forcewake_domain_id id; for_each_fw_domain_mask(d, fw_domains, dev_priv, id) { fw_domain_wait_ack_clear(d); fw_domain_get(d); fw_domain_wait_ack(d); } } static void fw_domains_put(struct drm_i915_private *dev_priv, enum forcewake_domains fw_domains) { struct intel_uncore_forcewake_domain *d; enum forcewake_domain_id id; for_each_fw_domain_mask(d, fw_domains, dev_priv, id) { fw_domain_put(d); fw_domain_posting_read(d); } } static void fw_domains_posting_read(struct drm_i915_private *dev_priv) { struct intel_uncore_forcewake_domain *d; enum forcewake_domain_id id; /* No need to do for all, just do for first found */ for_each_fw_domain(d, dev_priv, id) { fw_domain_posting_read(d); break; } } static void fw_domains_reset(struct drm_i915_private *dev_priv, enum forcewake_domains fw_domains) { struct intel_uncore_forcewake_domain *d; enum forcewake_domain_id id; WARN_ON(dev_priv->uncore.fw_domains == 0); for_each_fw_domain_mask(d, fw_domains, dev_priv, id) fw_domain_reset(d); fw_domains_posting_read(dev_priv); } static void __gen6_gt_wait_for_thread_c0(struct drm_i915_private *dev_priv) { /* w/a for a sporadic read returning 0 by waiting for the GT * thread to wake up. */ if (wait_for_atomic_us((__raw_i915_read32(dev_priv, GEN6_GT_THREAD_STATUS_REG) & GEN6_GT_THREAD_STATUS_CORE_MASK) == 0, 500)) DRM_ERROR("GT thread status wait timed out\n"); } static void fw_domains_get_with_thread_status(struct drm_i915_private *dev_priv, enum forcewake_domains fw_domains) { fw_domains_get(dev_priv, fw_domains); /* WaRsForcewakeWaitTC0:snb,ivb,hsw,bdw,vlv */ __gen6_gt_wait_for_thread_c0(dev_priv); } static void gen6_gt_check_fifodbg(struct drm_i915_private *dev_priv) { u32 gtfifodbg; gtfifodbg = __raw_i915_read32(dev_priv, GTFIFODBG); if (WARN(gtfifodbg, "GT wake FIFO error 0x%x\n", gtfifodbg)) __raw_i915_write32(dev_priv, GTFIFODBG, gtfifodbg); } static void fw_domains_put_with_fifo(struct drm_i915_private *dev_priv, enum forcewake_domains fw_domains) { fw_domains_put(dev_priv, fw_domains); gen6_gt_check_fifodbg(dev_priv); } static inline u32 fifo_free_entries(struct drm_i915_private *dev_priv) { u32 count = __raw_i915_read32(dev_priv, GTFIFOCTL); return count & GT_FIFO_FREE_ENTRIES_MASK; } static int __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv) { int ret = 0; /* On VLV, FIFO will be shared by both SW and HW. * So, we need to read the FREE_ENTRIES everytime */ if (IS_VALLEYVIEW(dev_priv->dev)) dev_priv->uncore.fifo_count = fifo_free_entries(dev_priv); if (dev_priv->uncore.fifo_count < GT_FIFO_NUM_RESERVED_ENTRIES) { int loop = 500; u32 fifo = fifo_free_entries(dev_priv); while (fifo <= GT_FIFO_NUM_RESERVED_ENTRIES && loop--) { udelay(10); fifo = fifo_free_entries(dev_priv); } if (WARN_ON(loop < 0 && fifo <= GT_FIFO_NUM_RESERVED_ENTRIES)) ++ret; dev_priv->uncore.fifo_count = fifo; } dev_priv->uncore.fifo_count--; return ret; } static void intel_uncore_fw_release_timer(unsigned long arg) { struct intel_uncore_forcewake_domain *domain = (void *)arg; unsigned long irqflags; assert_device_not_suspended(domain->i915); spin_lock_irqsave(&domain->i915->uncore.lock, irqflags); if (WARN_ON(domain->wake_count == 0)) domain->wake_count++; if (--domain->wake_count == 0) domain->i915->uncore.funcs.force_wake_put(domain->i915, 1 << domain->id); spin_unlock_irqrestore(&domain->i915->uncore.lock, irqflags); } void intel_uncore_forcewake_reset(struct drm_device *dev, bool restore) { struct drm_i915_private *dev_priv = dev->dev_private; unsigned long irqflags; struct intel_uncore_forcewake_domain *domain; int retry_count = 100; enum forcewake_domain_id id; enum forcewake_domains fw = 0, active_domains; /* Hold uncore.lock across reset to prevent any register access * with forcewake not set correctly. Wait until all pending * timers are run before holding. */ while (1) { active_domains = 0; for_each_fw_domain(domain, dev_priv, id) { if (del_timer_sync(&domain->timer) == 0) continue; intel_uncore_fw_release_timer((unsigned long)domain); } spin_lock_irqsave(&dev_priv->uncore.lock, irqflags); for_each_fw_domain(domain, dev_priv, id) { if (timer_pending(&domain->timer)) active_domains |= (1 << id); } if (active_domains == 0) break; if (--retry_count == 0) { DRM_ERROR("Timed out waiting for forcewake timers to finish\n"); break; } spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); cond_resched(); } WARN_ON(active_domains); for_each_fw_domain(domain, dev_priv, id) if (domain->wake_count) fw |= 1 << id; if (fw) dev_priv->uncore.funcs.force_wake_put(dev_priv, fw); fw_domains_reset(dev_priv, FORCEWAKE_ALL); if (restore) { /* If reset with a user forcewake, try to restore */ if (fw) dev_priv->uncore.funcs.force_wake_get(dev_priv, fw); if (IS_GEN6(dev) || IS_GEN7(dev)) dev_priv->uncore.fifo_count = fifo_free_entries(dev_priv); } if (!restore) assert_forcewakes_inactive(dev_priv); spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); } static void intel_uncore_ellc_detect(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; if ((IS_HASWELL(dev) || IS_BROADWELL(dev) || INTEL_INFO(dev)->gen >= 9) && (__raw_i915_read32(dev_priv, HSW_EDRAM_PRESENT) & EDRAM_ENABLED)) { /* The docs do not explain exactly how the calculation can be * made. It is somewhat guessable, but for now, it's always * 128MB. * NB: We can't write IDICR yet because we do not have gt funcs * set up */ dev_priv->ellc_size = 128; DRM_INFO("Found %zuMB of eLLC\n", dev_priv->ellc_size); } } static void __intel_uncore_early_sanitize(struct drm_device *dev, bool restore_forcewake) { struct drm_i915_private *dev_priv = dev->dev_private; if (HAS_FPGA_DBG_UNCLAIMED(dev)) __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM); /* clear out old GT FIFO errors */ if (IS_GEN6(dev) || IS_GEN7(dev)) __raw_i915_write32(dev_priv, GTFIFODBG, __raw_i915_read32(dev_priv, GTFIFODBG)); intel_uncore_forcewake_reset(dev, restore_forcewake); } void intel_uncore_early_sanitize(struct drm_device *dev, bool restore_forcewake) { __intel_uncore_early_sanitize(dev, restore_forcewake); i915_check_and_clear_faults(dev); } void intel_uncore_sanitize(struct drm_device *dev) { /* BIOS often leaves RC6 enabled, but disable it for hw init */ intel_disable_gt_powersave(dev); } /** * intel_uncore_forcewake_get - grab forcewake domain references * @dev_priv: i915 device instance * @fw_domains: forcewake domains to get reference on * * This function can be used get GT's forcewake domain references. * Normal register access will handle the forcewake domains automatically. * However if some sequence requires the GT to not power down a particular * forcewake domains this function should be called at the beginning of the * sequence. And subsequently the reference should be dropped by symmetric * call to intel_unforce_forcewake_put(). Usually caller wants all the domains * to be kept awake so the @fw_domains would be then FORCEWAKE_ALL. */ void intel_uncore_forcewake_get(struct drm_i915_private *dev_priv, enum forcewake_domains fw_domains) { unsigned long irqflags; struct intel_uncore_forcewake_domain *domain; enum forcewake_domain_id id; if (!dev_priv->uncore.funcs.force_wake_get) return; WARN_ON(dev_priv->pm.suspended); fw_domains &= dev_priv->uncore.fw_domains; spin_lock_irqsave(&dev_priv->uncore.lock, irqflags); for_each_fw_domain_mask(domain, fw_domains, dev_priv, id) { if (domain->wake_count++) fw_domains &= ~(1 << id); } if (fw_domains) dev_priv->uncore.funcs.force_wake_get(dev_priv, fw_domains); spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); } /** * intel_uncore_forcewake_put - release a forcewake domain reference * @dev_priv: i915 device instance * @fw_domains: forcewake domains to put references * * This function drops the device-level forcewakes for specified * domains obtained by intel_uncore_forcewake_get(). */ void intel_uncore_forcewake_put(struct drm_i915_private *dev_priv, enum forcewake_domains fw_domains) { unsigned long irqflags; struct intel_uncore_forcewake_domain *domain; enum forcewake_domain_id id; if (!dev_priv->uncore.funcs.force_wake_put) return; fw_domains &= dev_priv->uncore.fw_domains; spin_lock_irqsave(&dev_priv->uncore.lock, irqflags); for_each_fw_domain_mask(domain, fw_domains, dev_priv, id) { if (WARN_ON(domain->wake_count == 0)) continue; if (--domain->wake_count) continue; domain->wake_count++; fw_domain_arm_timer(domain); } spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); } void assert_forcewakes_inactive(struct drm_i915_private *dev_priv) { struct intel_uncore_forcewake_domain *domain; enum forcewake_domain_id id; if (!dev_priv->uncore.funcs.force_wake_get) return; for_each_fw_domain(domain, dev_priv, id) WARN_ON(domain->wake_count); } /* We give fast paths for the really cool registers */ #define NEEDS_FORCE_WAKE(dev_priv, reg) \ ((reg) < 0x40000 && (reg) != FORCEWAKE) #define REG_RANGE(reg, start, end) ((reg) >= (start) && (reg) < (end)) #define FORCEWAKE_VLV_RENDER_RANGE_OFFSET(reg) \ (REG_RANGE((reg), 0x2000, 0x4000) || \ REG_RANGE((reg), 0x5000, 0x8000) || \ REG_RANGE((reg), 0xB000, 0x12000) || \ REG_RANGE((reg), 0x2E000, 0x30000)) #define FORCEWAKE_VLV_MEDIA_RANGE_OFFSET(reg) \ (REG_RANGE((reg), 0x12000, 0x14000) || \ REG_RANGE((reg), 0x22000, 0x24000) || \ REG_RANGE((reg), 0x30000, 0x40000)) #define FORCEWAKE_CHV_RENDER_RANGE_OFFSET(reg) \ (REG_RANGE((reg), 0x2000, 0x4000) || \ REG_RANGE((reg), 0x5200, 0x8000) || \ REG_RANGE((reg), 0x8300, 0x8500) || \ REG_RANGE((reg), 0xB000, 0xB480) || \ REG_RANGE((reg), 0xE000, 0xE800)) #define FORCEWAKE_CHV_MEDIA_RANGE_OFFSET(reg) \ (REG_RANGE((reg), 0x8800, 0x8900) || \ REG_RANGE((reg), 0xD000, 0xD800) || \ REG_RANGE((reg), 0x12000, 0x14000) || \ REG_RANGE((reg), 0x1A000, 0x1C000) || \ REG_RANGE((reg), 0x1E800, 0x1EA00) || \ REG_RANGE((reg), 0x30000, 0x38000)) #define FORCEWAKE_CHV_COMMON_RANGE_OFFSET(reg) \ (REG_RANGE((reg), 0x4000, 0x5000) || \ REG_RANGE((reg), 0x8000, 0x8300) || \ REG_RANGE((reg), 0x8500, 0x8600) || \ REG_RANGE((reg), 0x9000, 0xB000) || \ REG_RANGE((reg), 0xF000, 0x10000)) #define FORCEWAKE_GEN9_UNCORE_RANGE_OFFSET(reg) \ REG_RANGE((reg), 0xB00, 0x2000) #define FORCEWAKE_GEN9_RENDER_RANGE_OFFSET(reg) \ (REG_RANGE((reg), 0x2000, 0x2700) || \ REG_RANGE((reg), 0x3000, 0x4000) || \ REG_RANGE((reg), 0x5200, 0x8000) || \ REG_RANGE((reg), 0x8140, 0x8160) || \ REG_RANGE((reg), 0x8300, 0x8500) || \ REG_RANGE((reg), 0x8C00, 0x8D00) || \ REG_RANGE((reg), 0xB000, 0xB480) || \ REG_RANGE((reg), 0xE000, 0xE900) || \ REG_RANGE((reg), 0x24400, 0x24800)) #define FORCEWAKE_GEN9_MEDIA_RANGE_OFFSET(reg) \ (REG_RANGE((reg), 0x8130, 0x8140) || \ REG_RANGE((reg), 0x8800, 0x8A00) || \ REG_RANGE((reg), 0xD000, 0xD800) || \ REG_RANGE((reg), 0x12000, 0x14000) || \ REG_RANGE((reg), 0x1A000, 0x1EA00) || \ REG_RANGE((reg), 0x30000, 0x40000)) #define FORCEWAKE_GEN9_COMMON_RANGE_OFFSET(reg) \ REG_RANGE((reg), 0x9400, 0x9800) #define FORCEWAKE_GEN9_BLITTER_RANGE_OFFSET(reg) \ ((reg) < 0x40000 &&\ !FORCEWAKE_GEN9_UNCORE_RANGE_OFFSET(reg) && \ !FORCEWAKE_GEN9_RENDER_RANGE_OFFSET(reg) && \ !FORCEWAKE_GEN9_MEDIA_RANGE_OFFSET(reg) && \ !FORCEWAKE_GEN9_COMMON_RANGE_OFFSET(reg)) static void ilk_dummy_write(struct drm_i915_private *dev_priv) { /* WaIssueDummyWriteToWakeupFromRC6:ilk Issue a dummy write to wake up * the chip from rc6 before touching it for real. MI_MODE is masked, * hence harmless to write 0 into. */ __raw_i915_write32(dev_priv, MI_MODE, 0); } static void hsw_unclaimed_reg_debug(struct drm_i915_private *dev_priv, u32 reg, bool read, bool before) { const char *op = read ? "reading" : "writing to"; const char *when = before ? "before" : "after"; if (!i915.mmio_debug) return; if (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM) { WARN(1, "Unclaimed register detected %s %s register 0x%x\n", when, op, reg); __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM); } } static void hsw_unclaimed_reg_detect(struct drm_i915_private *dev_priv) { if (i915.mmio_debug) return; if (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM) { DRM_ERROR("Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem."); __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM); } } #define GEN2_READ_HEADER(x) \ u##x val = 0; \ assert_device_not_suspended(dev_priv); #define GEN2_READ_FOOTER \ trace_i915_reg_rw(false, reg, val, sizeof(val), trace); \ return val #define __gen2_read(x) \ static u##x \ gen2_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \ GEN2_READ_HEADER(x); \ val = __raw_i915_read##x(dev_priv, reg); \ GEN2_READ_FOOTER; \ } #define __gen5_read(x) \ static u##x \ gen5_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \ GEN2_READ_HEADER(x); \ ilk_dummy_write(dev_priv); \ val = __raw_i915_read##x(dev_priv, reg); \ GEN2_READ_FOOTER; \ } __gen5_read(8) __gen5_read(16) __gen5_read(32) __gen5_read(64) __gen2_read(8) __gen2_read(16) __gen2_read(32) __gen2_read(64) #undef __gen5_read #undef __gen2_read #undef GEN2_READ_FOOTER #undef GEN2_READ_HEADER #define GEN6_READ_HEADER(x) \ unsigned long irqflags; \ u##x val = 0; \ assert_device_not_suspended(dev_priv); \ spin_lock_irqsave(&dev_priv->uncore.lock, irqflags) #define GEN6_READ_FOOTER \ spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \ trace_i915_reg_rw(false, reg, val, sizeof(val), trace); \ return val static inline void __force_wake_get(struct drm_i915_private *dev_priv, enum forcewake_domains fw_domains) { struct intel_uncore_forcewake_domain *domain; enum forcewake_domain_id id; if (WARN_ON(!fw_domains)) return; /* Ideally GCC would be constant-fold and eliminate this loop */ for_each_fw_domain_mask(domain, fw_domains, dev_priv, id) { if (domain->wake_count) { fw_domains &= ~(1 << id); continue; } domain->wake_count++; fw_domain_arm_timer(domain); } if (fw_domains) dev_priv->uncore.funcs.force_wake_get(dev_priv, fw_domains); } #define __vgpu_read(x) \ static u##x \ vgpu_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \ GEN6_READ_HEADER(x); \ val = __raw_i915_read##x(dev_priv, reg); \ GEN6_READ_FOOTER; \ } #define __gen6_read(x) \ static u##x \ gen6_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \ GEN6_READ_HEADER(x); \ hsw_unclaimed_reg_debug(dev_priv, reg, true, true); \ if (NEEDS_FORCE_WAKE((dev_priv), (reg))) \ __force_wake_get(dev_priv, FORCEWAKE_RENDER); \ val = __raw_i915_read##x(dev_priv, reg); \ hsw_unclaimed_reg_debug(dev_priv, reg, true, false); \ GEN6_READ_FOOTER; \ } #define __vlv_read(x) \ static u##x \ vlv_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \ GEN6_READ_HEADER(x); \ if (FORCEWAKE_VLV_RENDER_RANGE_OFFSET(reg)) \ __force_wake_get(dev_priv, FORCEWAKE_RENDER); \ else if (FORCEWAKE_VLV_MEDIA_RANGE_OFFSET(reg)) \ __force_wake_get(dev_priv, FORCEWAKE_MEDIA); \ val = __raw_i915_read##x(dev_priv, reg); \ GEN6_READ_FOOTER; \ } #define __chv_read(x) \ static u##x \ chv_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \ GEN6_READ_HEADER(x); \ if (FORCEWAKE_CHV_RENDER_RANGE_OFFSET(reg)) \ __force_wake_get(dev_priv, FORCEWAKE_RENDER); \ else if (FORCEWAKE_CHV_MEDIA_RANGE_OFFSET(reg)) \ __force_wake_get(dev_priv, FORCEWAKE_MEDIA); \ else if (FORCEWAKE_CHV_COMMON_RANGE_OFFSET(reg)) \ __force_wake_get(dev_priv, \ FORCEWAKE_RENDER | FORCEWAKE_MEDIA); \ val = __raw_i915_read##x(dev_priv, reg); \ GEN6_READ_FOOTER; \ } #define SKL_NEEDS_FORCE_WAKE(dev_priv, reg) \ ((reg) < 0x40000 && !FORCEWAKE_GEN9_UNCORE_RANGE_OFFSET(reg)) #define __gen9_read(x) \ static u##x \ gen9_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \ enum forcewake_domains fw_engine; \ GEN6_READ_HEADER(x); \ if (!SKL_NEEDS_FORCE_WAKE((dev_priv), (reg))) \ fw_engine = 0; \ else if (FORCEWAKE_GEN9_RENDER_RANGE_OFFSET(reg)) \ fw_engine = FORCEWAKE_RENDER; \ else if (FORCEWAKE_GEN9_MEDIA_RANGE_OFFSET(reg)) \ fw_engine = FORCEWAKE_MEDIA; \ else if (FORCEWAKE_GEN9_COMMON_RANGE_OFFSET(reg)) \ fw_engine = FORCEWAKE_RENDER | FORCEWAKE_MEDIA; \ else \ fw_engine = FORCEWAKE_BLITTER; \ if (fw_engine) \ __force_wake_get(dev_priv, fw_engine); \ val = __raw_i915_read##x(dev_priv, reg); \ GEN6_READ_FOOTER; \ } __vgpu_read(8) __vgpu_read(16) __vgpu_read(32) __vgpu_read(64) __gen9_read(8) __gen9_read(16) __gen9_read(32) __gen9_read(64) __chv_read(8) __chv_read(16) __chv_read(32) __chv_read(64) __vlv_read(8) __vlv_read(16) __vlv_read(32) __vlv_read(64) __gen6_read(8) __gen6_read(16) __gen6_read(32) __gen6_read(64) #undef __gen9_read #undef __chv_read #undef __vlv_read #undef __gen6_read #undef __vgpu_read #undef GEN6_READ_FOOTER #undef GEN6_READ_HEADER #define GEN2_WRITE_HEADER \ trace_i915_reg_rw(true, reg, val, sizeof(val), trace); \ assert_device_not_suspended(dev_priv); \ #define GEN2_WRITE_FOOTER #define __gen2_write(x) \ static void \ gen2_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \ GEN2_WRITE_HEADER; \ __raw_i915_write##x(dev_priv, reg, val); \ GEN2_WRITE_FOOTER; \ } #define __gen5_write(x) \ static void \ gen5_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \ GEN2_WRITE_HEADER; \ ilk_dummy_write(dev_priv); \ __raw_i915_write##x(dev_priv, reg, val); \ GEN2_WRITE_FOOTER; \ } __gen5_write(8) __gen5_write(16) __gen5_write(32) __gen5_write(64) __gen2_write(8) __gen2_write(16) __gen2_write(32) __gen2_write(64) #undef __gen5_write #undef __gen2_write #undef GEN2_WRITE_FOOTER #undef GEN2_WRITE_HEADER #define GEN6_WRITE_HEADER \ unsigned long irqflags; \ trace_i915_reg_rw(true, reg, val, sizeof(val), trace); \ assert_device_not_suspended(dev_priv); \ spin_lock_irqsave(&dev_priv->uncore.lock, irqflags) #define GEN6_WRITE_FOOTER \ spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags) #define __gen6_write(x) \ static void \ gen6_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \ u32 __fifo_ret = 0; \ GEN6_WRITE_HEADER; \ if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \ __fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \ } \ __raw_i915_write##x(dev_priv, reg, val); \ if (unlikely(__fifo_ret)) { \ gen6_gt_check_fifodbg(dev_priv); \ } \ GEN6_WRITE_FOOTER; \ } #define __hsw_write(x) \ static void \ hsw_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \ u32 __fifo_ret = 0; \ GEN6_WRITE_HEADER; \ if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \ __fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \ } \ hsw_unclaimed_reg_debug(dev_priv, reg, false, true); \ __raw_i915_write##x(dev_priv, reg, val); \ if (unlikely(__fifo_ret)) { \ gen6_gt_check_fifodbg(dev_priv); \ } \ hsw_unclaimed_reg_debug(dev_priv, reg, false, false); \ hsw_unclaimed_reg_detect(dev_priv); \ GEN6_WRITE_FOOTER; \ } #define __vgpu_write(x) \ static void vgpu_write##x(struct drm_i915_private *dev_priv, \ off_t reg, u##x val, bool trace) { \ GEN6_WRITE_HEADER; \ __raw_i915_write##x(dev_priv, reg, val); \ GEN6_WRITE_FOOTER; \ } static const u32 gen8_shadowed_regs[] = { FORCEWAKE_MT, GEN6_RPNSWREQ, GEN6_RC_VIDEO_FREQ, RING_TAIL(RENDER_RING_BASE), RING_TAIL(GEN6_BSD_RING_BASE), RING_TAIL(VEBOX_RING_BASE), RING_TAIL(BLT_RING_BASE), /* TODO: Other registers are not yet used */ }; static bool is_gen8_shadowed(struct drm_i915_private *dev_priv, u32 reg) { int i; for (i = 0; i < ARRAY_SIZE(gen8_shadowed_regs); i++) if (reg == gen8_shadowed_regs[i]) return true; return false; } #define __gen8_write(x) \ static void \ gen8_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \ GEN6_WRITE_HEADER; \ hsw_unclaimed_reg_debug(dev_priv, reg, false, true); \ if (reg < 0x40000 && !is_gen8_shadowed(dev_priv, reg)) \ __force_wake_get(dev_priv, FORCEWAKE_RENDER); \ __raw_i915_write##x(dev_priv, reg, val); \ hsw_unclaimed_reg_debug(dev_priv, reg, false, false); \ hsw_unclaimed_reg_detect(dev_priv); \ GEN6_WRITE_FOOTER; \ } #define __chv_write(x) \ static void \ chv_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \ bool shadowed = is_gen8_shadowed(dev_priv, reg); \ GEN6_WRITE_HEADER; \ if (!shadowed) { \ if (FORCEWAKE_CHV_RENDER_RANGE_OFFSET(reg)) \ __force_wake_get(dev_priv, FORCEWAKE_RENDER); \ else if (FORCEWAKE_CHV_MEDIA_RANGE_OFFSET(reg)) \ __force_wake_get(dev_priv, FORCEWAKE_MEDIA); \ else if (FORCEWAKE_CHV_COMMON_RANGE_OFFSET(reg)) \ __force_wake_get(dev_priv, FORCEWAKE_RENDER | FORCEWAKE_MEDIA); \ } \ __raw_i915_write##x(dev_priv, reg, val); \ GEN6_WRITE_FOOTER; \ } static const u32 gen9_shadowed_regs[] = { RING_TAIL(RENDER_RING_BASE), RING_TAIL(GEN6_BSD_RING_BASE), RING_TAIL(VEBOX_RING_BASE), RING_TAIL(BLT_RING_BASE), FORCEWAKE_BLITTER_GEN9, FORCEWAKE_RENDER_GEN9, FORCEWAKE_MEDIA_GEN9, GEN6_RPNSWREQ, GEN6_RC_VIDEO_FREQ, /* TODO: Other registers are not yet used */ }; static bool is_gen9_shadowed(struct drm_i915_private *dev_priv, u32 reg) { int i; for (i = 0; i < ARRAY_SIZE(gen9_shadowed_regs); i++) if (reg == gen9_shadowed_regs[i]) return true; return false; } #define __gen9_write(x) \ static void \ gen9_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, \ bool trace) { \ enum forcewake_domains fw_engine; \ GEN6_WRITE_HEADER; \ if (!SKL_NEEDS_FORCE_WAKE((dev_priv), (reg)) || \ is_gen9_shadowed(dev_priv, reg)) \ fw_engine = 0; \ else if (FORCEWAKE_GEN9_RENDER_RANGE_OFFSET(reg)) \ fw_engine = FORCEWAKE_RENDER; \ else if (FORCEWAKE_GEN9_MEDIA_RANGE_OFFSET(reg)) \ fw_engine = FORCEWAKE_MEDIA; \ else if (FORCEWAKE_GEN9_COMMON_RANGE_OFFSET(reg)) \ fw_engine = FORCEWAKE_RENDER | FORCEWAKE_MEDIA; \ else \ fw_engine = FORCEWAKE_BLITTER; \ if (fw_engine) \ __force_wake_get(dev_priv, fw_engine); \ __raw_i915_write##x(dev_priv, reg, val); \ GEN6_WRITE_FOOTER; \ } __gen9_write(8) __gen9_write(16) __gen9_write(32) __gen9_write(64) __chv_write(8) __chv_write(16) __chv_write(32) __chv_write(64) __gen8_write(8) __gen8_write(16) __gen8_write(32) __gen8_write(64) __hsw_write(8) __hsw_write(16) __hsw_write(32) __hsw_write(64) __gen6_write(8) __gen6_write(16) __gen6_write(32) __gen6_write(64) __vgpu_write(8) __vgpu_write(16) __vgpu_write(32) __vgpu_write(64) #undef __gen9_write #undef __chv_write #undef __gen8_write #undef __hsw_write #undef __gen6_write #undef __vgpu_write #undef GEN6_WRITE_FOOTER #undef GEN6_WRITE_HEADER #define ASSIGN_WRITE_MMIO_VFUNCS(x) \ do { \ dev_priv->uncore.funcs.mmio_writeb = x##_write8; \ dev_priv->uncore.funcs.mmio_writew = x##_write16; \ dev_priv->uncore.funcs.mmio_writel = x##_write32; \ dev_priv->uncore.funcs.mmio_writeq = x##_write64; \ } while (0) #define ASSIGN_READ_MMIO_VFUNCS(x) \ do { \ dev_priv->uncore.funcs.mmio_readb = x##_read8; \ dev_priv->uncore.funcs.mmio_readw = x##_read16; \ dev_priv->uncore.funcs.mmio_readl = x##_read32; \ dev_priv->uncore.funcs.mmio_readq = x##_read64; \ } while (0) static void fw_domain_init(struct drm_i915_private *dev_priv, enum forcewake_domain_id domain_id, u32 reg_set, u32 reg_ack) { struct intel_uncore_forcewake_domain *d; if (WARN_ON(domain_id >= FW_DOMAIN_ID_COUNT)) return; d = &dev_priv->uncore.fw_domain[domain_id]; WARN_ON(d->wake_count); d->wake_count = 0; d->reg_set = reg_set; d->reg_ack = reg_ack; if (IS_GEN6(dev_priv)) { d->val_reset = 0; d->val_set = FORCEWAKE_KERNEL; d->val_clear = 0; } else { /* WaRsClearFWBitsAtReset:bdw,skl */ d->val_reset = _MASKED_BIT_DISABLE(0xffff); d->val_set = _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL); d->val_clear = _MASKED_BIT_DISABLE(FORCEWAKE_KERNEL); } if (IS_VALLEYVIEW(dev_priv)) d->reg_post = FORCEWAKE_ACK_VLV; else if (IS_GEN6(dev_priv) || IS_GEN7(dev_priv) || IS_GEN8(dev_priv)) d->reg_post = ECOBUS; else d->reg_post = 0; d->i915 = dev_priv; d->id = domain_id; setup_timer(&d->timer, intel_uncore_fw_release_timer, (unsigned long)d); dev_priv->uncore.fw_domains |= (1 << domain_id); fw_domain_reset(d); } static void intel_uncore_fw_domains_init(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; if (IS_GEN9(dev)) { dev_priv->uncore.funcs.force_wake_get = fw_domains_get; dev_priv->uncore.funcs.force_wake_put = fw_domains_put; fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER, FORCEWAKE_RENDER_GEN9, FORCEWAKE_ACK_RENDER_GEN9); fw_domain_init(dev_priv, FW_DOMAIN_ID_BLITTER, FORCEWAKE_BLITTER_GEN9, FORCEWAKE_ACK_BLITTER_GEN9); fw_domain_init(dev_priv, FW_DOMAIN_ID_MEDIA, FORCEWAKE_MEDIA_GEN9, FORCEWAKE_ACK_MEDIA_GEN9); } else if (IS_VALLEYVIEW(dev)) { dev_priv->uncore.funcs.force_wake_get = fw_domains_get; if (!IS_CHERRYVIEW(dev)) dev_priv->uncore.funcs.force_wake_put = fw_domains_put_with_fifo; else dev_priv->uncore.funcs.force_wake_put = fw_domains_put; fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER, FORCEWAKE_VLV, FORCEWAKE_ACK_VLV); fw_domain_init(dev_priv, FW_DOMAIN_ID_MEDIA, FORCEWAKE_MEDIA_VLV, FORCEWAKE_ACK_MEDIA_VLV); } else if (IS_HASWELL(dev) || IS_BROADWELL(dev)) { dev_priv->uncore.funcs.force_wake_get = fw_domains_get_with_thread_status; dev_priv->uncore.funcs.force_wake_put = fw_domains_put; fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER, FORCEWAKE_MT, FORCEWAKE_ACK_HSW); } else if (IS_IVYBRIDGE(dev)) { u32 ecobus; /* IVB configs may use multi-threaded forcewake */ /* A small trick here - if the bios hasn't configured * MT forcewake, and if the device is in RC6, then * force_wake_mt_get will not wake the device and the * ECOBUS read will return zero. Which will be * (correctly) interpreted by the test below as MT * forcewake being disabled. */ dev_priv->uncore.funcs.force_wake_get = fw_domains_get_with_thread_status; dev_priv->uncore.funcs.force_wake_put = fw_domains_put_with_fifo; /* We need to init first for ECOBUS access and then * determine later if we want to reinit, in case of MT access is * not working */ fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER, FORCEWAKE_MT, FORCEWAKE_MT_ACK); mutex_lock(&dev->struct_mutex); fw_domains_get_with_thread_status(dev_priv, FORCEWAKE_ALL); ecobus = __raw_i915_read32(dev_priv, ECOBUS); fw_domains_put_with_fifo(dev_priv, FORCEWAKE_ALL); mutex_unlock(&dev->struct_mutex); if (!(ecobus & FORCEWAKE_MT_ENABLE)) { DRM_INFO("No MT forcewake available on Ivybridge, this can result in issues\n"); DRM_INFO("when using vblank-synced partial screen updates.\n"); fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER, FORCEWAKE, FORCEWAKE_ACK); } } else if (IS_GEN6(dev)) { dev_priv->uncore.funcs.force_wake_get = fw_domains_get_with_thread_status; dev_priv->uncore.funcs.force_wake_put = fw_domains_put_with_fifo; fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER, FORCEWAKE, FORCEWAKE_ACK); } } void intel_uncore_init(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; i915_check_vgpu(dev); intel_uncore_ellc_detect(dev); intel_uncore_fw_domains_init(dev); __intel_uncore_early_sanitize(dev, false); switch (INTEL_INFO(dev)->gen) { default: MISSING_CASE(INTEL_INFO(dev)->gen); return; case 9: ASSIGN_WRITE_MMIO_VFUNCS(gen9); ASSIGN_READ_MMIO_VFUNCS(gen9); break; case 8: if (IS_CHERRYVIEW(dev)) { ASSIGN_WRITE_MMIO_VFUNCS(chv); ASSIGN_READ_MMIO_VFUNCS(chv); } else { ASSIGN_WRITE_MMIO_VFUNCS(gen8); ASSIGN_READ_MMIO_VFUNCS(gen6); } break; case 7: case 6: if (IS_HASWELL(dev)) { ASSIGN_WRITE_MMIO_VFUNCS(hsw); } else { ASSIGN_WRITE_MMIO_VFUNCS(gen6); } if (IS_VALLEYVIEW(dev)) { ASSIGN_READ_MMIO_VFUNCS(vlv); } else { ASSIGN_READ_MMIO_VFUNCS(gen6); } break; case 5: ASSIGN_WRITE_MMIO_VFUNCS(gen5); ASSIGN_READ_MMIO_VFUNCS(gen5); break; case 4: case 3: case 2: ASSIGN_WRITE_MMIO_VFUNCS(gen2); ASSIGN_READ_MMIO_VFUNCS(gen2); break; } if (intel_vgpu_active(dev)) { ASSIGN_WRITE_MMIO_VFUNCS(vgpu); ASSIGN_READ_MMIO_VFUNCS(vgpu); } i915_check_and_clear_faults(dev); } #undef ASSIGN_WRITE_MMIO_VFUNCS #undef ASSIGN_READ_MMIO_VFUNCS void intel_uncore_fini(struct drm_device *dev) { /* Paranoia: make sure we have disabled everything before we exit. */ intel_uncore_sanitize(dev); intel_uncore_forcewake_reset(dev, false); } #define GEN_RANGE(l, h) GENMASK(h, l) static const struct register_whitelist { uint64_t offset; uint32_t size; /* supported gens, 0x10 for 4, 0x30 for 4 and 5, etc. */ uint32_t gen_bitmask; } whitelist[] = { { RING_TIMESTAMP(RENDER_RING_BASE), 8, GEN_RANGE(4, 9) }, }; int i915_reg_read_ioctl(struct drm_device *dev, void *data, struct drm_file *file) { struct drm_i915_private *dev_priv = dev->dev_private; struct drm_i915_reg_read *reg = data; struct register_whitelist const *entry = whitelist; int i, ret = 0; for (i = 0; i < ARRAY_SIZE(whitelist); i++, entry++) { if (entry->offset == reg->offset && (1 << INTEL_INFO(dev)->gen & entry->gen_bitmask)) break; } if (i == ARRAY_SIZE(whitelist)) return -EINVAL; intel_runtime_pm_get(dev_priv); switch (entry->size) { case 8: reg->val = I915_READ64(reg->offset); break; case 4: reg->val = I915_READ(reg->offset); break; case 2: reg->val = I915_READ16(reg->offset); break; case 1: reg->val = I915_READ8(reg->offset); break; default: MISSING_CASE(entry->size); ret = -EINVAL; goto out; } out: intel_runtime_pm_put(dev_priv); return ret; } int i915_get_reset_stats_ioctl(struct drm_device *dev, void *data, struct drm_file *file) { struct drm_i915_private *dev_priv = dev->dev_private; struct drm_i915_reset_stats *args = data; struct i915_ctx_hang_stats *hs; struct intel_context *ctx; int ret; if (args->flags || args->pad) return -EINVAL; if (args->ctx_id == DEFAULT_CONTEXT_HANDLE && !capable(CAP_SYS_ADMIN)) return -EPERM; ret = mutex_lock_interruptible(&dev->struct_mutex); if (ret) return ret; ctx = i915_gem_context_get(file->driver_priv, args->ctx_id); if (IS_ERR(ctx)) { mutex_unlock(&dev->struct_mutex); return PTR_ERR(ctx); } hs = &ctx->hang_stats; if (capable(CAP_SYS_ADMIN)) args->reset_count = i915_reset_count(&dev_priv->gpu_error); else args->reset_count = 0; args->batch_active = hs->batch_active; args->batch_pending = hs->batch_pending; mutex_unlock(&dev->struct_mutex); return 0; } static int i915_reset_complete(struct drm_device *dev) { u8 gdrst; pci_read_config_byte(dev->pdev, I915_GDRST, &gdrst); return (gdrst & GRDOM_RESET_STATUS) == 0; } static int i915_do_reset(struct drm_device *dev) { /* assert reset for at least 20 usec */ pci_write_config_byte(dev->pdev, I915_GDRST, GRDOM_RESET_ENABLE); udelay(20); pci_write_config_byte(dev->pdev, I915_GDRST, 0); return wait_for(i915_reset_complete(dev), 500); } static int g4x_reset_complete(struct drm_device *dev) { u8 gdrst; pci_read_config_byte(dev->pdev, I915_GDRST, &gdrst); return (gdrst & GRDOM_RESET_ENABLE) == 0; } static int g33_do_reset(struct drm_device *dev) { pci_write_config_byte(dev->pdev, I915_GDRST, GRDOM_RESET_ENABLE); return wait_for(g4x_reset_complete(dev), 500); } static int g4x_do_reset(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; int ret; pci_write_config_byte(dev->pdev, I915_GDRST, GRDOM_RENDER | GRDOM_RESET_ENABLE); ret = wait_for(g4x_reset_complete(dev), 500); if (ret) return ret; /* WaVcpClkGateDisableForMediaReset:ctg,elk */ I915_WRITE(VDECCLK_GATE_D, I915_READ(VDECCLK_GATE_D) | VCP_UNIT_CLOCK_GATE_DISABLE); POSTING_READ(VDECCLK_GATE_D); pci_write_config_byte(dev->pdev, I915_GDRST, GRDOM_MEDIA | GRDOM_RESET_ENABLE); ret = wait_for(g4x_reset_complete(dev), 500); if (ret) return ret; /* WaVcpClkGateDisableForMediaReset:ctg,elk */ I915_WRITE(VDECCLK_GATE_D, I915_READ(VDECCLK_GATE_D) & ~VCP_UNIT_CLOCK_GATE_DISABLE); POSTING_READ(VDECCLK_GATE_D); pci_write_config_byte(dev->pdev, I915_GDRST, 0); return 0; } static int ironlake_do_reset(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; int ret; I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR, ILK_GRDOM_RENDER | ILK_GRDOM_RESET_ENABLE); ret = wait_for((I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) & ILK_GRDOM_RESET_ENABLE) == 0, 500); if (ret) return ret; I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR, ILK_GRDOM_MEDIA | ILK_GRDOM_RESET_ENABLE); ret = wait_for((I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) & ILK_GRDOM_RESET_ENABLE) == 0, 500); if (ret) return ret; I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR, 0); return 0; } static int gen6_do_reset(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; int ret; /* Reset the chip */ /* GEN6_GDRST is not in the gt power well, no need to check * for fifo space for the write or forcewake the chip for * the read */ __raw_i915_write32(dev_priv, GEN6_GDRST, GEN6_GRDOM_FULL); /* Spin waiting for the device to ack the reset request */ ret = wait_for((__raw_i915_read32(dev_priv, GEN6_GDRST) & GEN6_GRDOM_FULL) == 0, 500); intel_uncore_forcewake_reset(dev, true); return ret; } int intel_gpu_reset(struct drm_device *dev) { if (INTEL_INFO(dev)->gen >= 6) return gen6_do_reset(dev); else if (IS_GEN5(dev)) return ironlake_do_reset(dev); else if (IS_G4X(dev)) return g4x_do_reset(dev); else if (IS_G33(dev)) return g33_do_reset(dev); else if (INTEL_INFO(dev)->gen >= 3) return i915_do_reset(dev); else return -ENODEV; } void intel_uncore_check_errors(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; if (HAS_FPGA_DBG_UNCLAIMED(dev) && (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM)) { DRM_ERROR("Unclaimed register before interrupt\n"); __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM); } }