drivers/gpu/drm/i915/gt/intel_gt_pm_irq.c

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright © 2019 Intel Corporation
   5  */
   6
   7 #include "i915_drv.h"
   8 #include "i915_reg.h"
   9 #include "intel_gt.h"
  10 #include "intel_gt_irq.h"
  11 #include "intel_gt_pm_irq.h"
  12
  13 static void write_pm_imr(struct intel_gt *gt)
  14 {
  15         struct drm_i915_private *i915 = gt->i915;
  16         struct intel_uncore *uncore = gt->uncore;
  17         u32 mask = gt->pm_imr;
  18         i915_reg_t reg;
  19
  20         if (INTEL_GEN(i915) >= 11) {
  21                 reg = GEN11_GPM_WGBOXPERF_INTR_MASK;
  22                 mask <<= 16; /* pm is in upper half */
  23         } else if (INTEL_GEN(i915) >= 8) {
  24                 reg = GEN8_GT_IMR(2);
  25         } else {
  26                 reg = GEN6_PMIMR;
  27         }
  28
  29         intel_uncore_write(uncore, reg, mask);
  30 }
  31
  32 static void gen6_gt_pm_update_irq(struct intel_gt *gt,
  33                                   u32 interrupt_mask,
  34                                   u32 enabled_irq_mask)
  35 {
  36         u32 new_val;
  37
  38         WARN_ON(enabled_irq_mask & ~interrupt_mask);
  39
  40         lockdep_assert_held(&gt->irq_lock);
  41
  42         new_val = gt->pm_imr;
  43         new_val &= ~interrupt_mask;
  44         new_val |= ~enabled_irq_mask & interrupt_mask;
  45
  46         if (new_val != gt->pm_imr) {
  47                 gt->pm_imr = new_val;
  48                 write_pm_imr(gt);
  49         }
  50 }
  51
  52 void gen6_gt_pm_unmask_irq(struct intel_gt *gt, u32 mask)
  53 {
  54         gen6_gt_pm_update_irq(gt, mask, mask);
  55 }
  56
  57 void gen6_gt_pm_mask_irq(struct intel_gt *gt, u32 mask)
  58 {
  59         gen6_gt_pm_update_irq(gt, mask, 0);
  60 }
  61
  62 void gen6_gt_pm_reset_iir(struct intel_gt *gt, u32 reset_mask)
  63 {
  64         struct intel_uncore *uncore = gt->uncore;
  65         i915_reg_t reg = INTEL_GEN(gt->i915) >= 8 ? GEN8_GT_IIR(2) : GEN6_PMIIR;
  66
  67         lockdep_assert_held(&gt->irq_lock);
  68
  69         intel_uncore_write(uncore, reg, reset_mask);
  70         intel_uncore_write(uncore, reg, reset_mask);
  71         intel_uncore_posting_read(uncore, reg);
  72 }
  73
  74 static void write_pm_ier(struct intel_gt *gt)
  75 {
  76         struct drm_i915_private *i915 = gt->i915;
  77         struct intel_uncore *uncore = gt->uncore;
  78         u32 mask = gt->pm_ier;
  79         i915_reg_t reg;
  80
  81         if (INTEL_GEN(i915) >= 11) {
  82                 reg = GEN11_GPM_WGBOXPERF_INTR_ENABLE;
  83                 mask <<= 16; /* pm is in upper half */
  84         } else if (INTEL_GEN(i915) >= 8) {
  85                 reg = GEN8_GT_IER(2);
  86         } else {
  87                 reg = GEN6_PMIER;
  88         }
  89
  90         intel_uncore_write(uncore, reg, mask);
  91 }
  92
  93 void gen6_gt_pm_enable_irq(struct intel_gt *gt, u32 enable_mask)
  94 {
  95         lockdep_assert_held(&gt->irq_lock);
  96
  97         gt->pm_ier |= enable_mask;
  98         write_pm_ier(gt);
  99         gen6_gt_pm_unmask_irq(gt, enable_mask);
 100 }
 101
 102 void gen6_gt_pm_disable_irq(struct intel_gt *gt, u32 disable_mask)
 103 {
 104         lockdep_assert_held(&gt->irq_lock);
 105
 106         gt->pm_ier &= ~disable_mask;
 107         gen6_gt_pm_mask_irq(gt, disable_mask);
 108         write_pm_ier(gt);
 109 }