drivers/gpu/drm/i915/intel_pch.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright 2019 Intel Corporation.
   4  */
   5
   6 #include "i915_drv.h"
   7 #include "intel_pch.h"
   8
   9 /* Map PCH device id to PCH type, or PCH_NONE if unknown. */
  10 static enum intel_pch
  11 intel_pch_type(const struct drm_i915_private *dev_priv, unsigned short id)
  12 {
  13         switch (id) {
  14         case INTEL_PCH_IBX_DEVICE_ID_TYPE:
  15                 drm_dbg_kms(&dev_priv->drm, "Found Ibex Peak PCH\n");
  16                 WARN_ON(!IS_GEN(dev_priv, 5));
  17                 return PCH_IBX;
  18         case INTEL_PCH_CPT_DEVICE_ID_TYPE:
  19                 drm_dbg_kms(&dev_priv->drm, "Found CougarPoint PCH\n");
  20                 WARN_ON(!IS_GEN(dev_priv, 6) && !IS_IVYBRIDGE(dev_priv));
  21                 return PCH_CPT;
  22         case INTEL_PCH_PPT_DEVICE_ID_TYPE:
  23                 drm_dbg_kms(&dev_priv->drm, "Found PantherPoint PCH\n");
  24                 WARN_ON(!IS_GEN(dev_priv, 6) && !IS_IVYBRIDGE(dev_priv));
  25                 /* PantherPoint is CPT compatible */
  26                 return PCH_CPT;
  27         case INTEL_PCH_LPT_DEVICE_ID_TYPE:
  28                 drm_dbg_kms(&dev_priv->drm, "Found LynxPoint PCH\n");
  29                 WARN_ON(!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
  30                 WARN_ON(IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv));
  31                 return PCH_LPT;
  32         case INTEL_PCH_LPT_LP_DEVICE_ID_TYPE:
  33                 drm_dbg_kms(&dev_priv->drm, "Found LynxPoint LP PCH\n");
  34                 WARN_ON(!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
  35                 WARN_ON(!IS_HSW_ULT(dev_priv) && !IS_BDW_ULT(dev_priv));
  36                 return PCH_LPT;
  37         case INTEL_PCH_WPT_DEVICE_ID_TYPE:
  38                 drm_dbg_kms(&dev_priv->drm, "Found WildcatPoint PCH\n");
  39                 WARN_ON(!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
  40                 WARN_ON(IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv));
  41                 /* WildcatPoint is LPT compatible */
  42                 return PCH_LPT;
  43         case INTEL_PCH_WPT_LP_DEVICE_ID_TYPE:
  44                 drm_dbg_kms(&dev_priv->drm, "Found WildcatPoint LP PCH\n");
  45                 WARN_ON(!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
  46                 WARN_ON(!IS_HSW_ULT(dev_priv) && !IS_BDW_ULT(dev_priv));
  47                 /* WildcatPoint is LPT compatible */
  48                 return PCH_LPT;
  49         case INTEL_PCH_SPT_DEVICE_ID_TYPE:
  50                 drm_dbg_kms(&dev_priv->drm, "Found SunrisePoint PCH\n");
  51                 WARN_ON(!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv));
  52                 return PCH_SPT;
  53         case INTEL_PCH_SPT_LP_DEVICE_ID_TYPE:
  54                 drm_dbg_kms(&dev_priv->drm, "Found SunrisePoint LP PCH\n");
  55                 WARN_ON(!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv) &&
  56                         !IS_COFFEELAKE(dev_priv));
  57                 return PCH_SPT;
  58         case INTEL_PCH_KBP_DEVICE_ID_TYPE:
  59                 drm_dbg_kms(&dev_priv->drm, "Found Kaby Lake PCH (KBP)\n");
  60                 WARN_ON(!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv) &&
  61                         !IS_COFFEELAKE(dev_priv));
  62                 /* KBP is SPT compatible */
  63                 return PCH_SPT;
  64         case INTEL_PCH_CNP_DEVICE_ID_TYPE:
  65                 drm_dbg_kms(&dev_priv->drm, "Found Cannon Lake PCH (CNP)\n");
  66                 WARN_ON(!IS_CANNONLAKE(dev_priv) && !IS_COFFEELAKE(dev_priv));
  67                 return PCH_CNP;
  68         case INTEL_PCH_CNP_LP_DEVICE_ID_TYPE:
  69                 drm_dbg_kms(&dev_priv->drm,
  70                             "Found Cannon Lake LP PCH (CNP-LP)\n");
  71                 WARN_ON(!IS_CANNONLAKE(dev_priv) && !IS_COFFEELAKE(dev_priv));
  72                 return PCH_CNP;
  73         case INTEL_PCH_CMP_DEVICE_ID_TYPE:
  74         case INTEL_PCH_CMP2_DEVICE_ID_TYPE:
  75                 drm_dbg_kms(&dev_priv->drm, "Found Comet Lake PCH (CMP)\n");
  76                 WARN_ON(!IS_COFFEELAKE(dev_priv));
  77                 /* CometPoint is CNP Compatible */
  78                 return PCH_CNP;
  79         case INTEL_PCH_CMP_V_DEVICE_ID_TYPE:
  80                 drm_dbg_kms(&dev_priv->drm, "Found Comet Lake V PCH (CMP-V)\n");
  81                 WARN_ON(!IS_COFFEELAKE(dev_priv));
  82                 /* Comet Lake V PCH is based on KBP, which is SPT compatible */
  83                 return PCH_SPT;
  84         case INTEL_PCH_ICP_DEVICE_ID_TYPE:
  85                 drm_dbg_kms(&dev_priv->drm, "Found Ice Lake PCH\n");
  86                 WARN_ON(!IS_ICELAKE(dev_priv));
  87                 return PCH_ICP;
  88         case INTEL_PCH_MCC_DEVICE_ID_TYPE:
  89                 drm_dbg_kms(&dev_priv->drm, "Found Mule Creek Canyon PCH\n");
  90                 WARN_ON(!IS_ELKHARTLAKE(dev_priv));
  91                 return PCH_MCC;
  92         case INTEL_PCH_TGP_DEVICE_ID_TYPE:
  93         case INTEL_PCH_TGP2_DEVICE_ID_TYPE:
  94                 drm_dbg_kms(&dev_priv->drm, "Found Tiger Lake LP PCH\n");
  95                 WARN_ON(!IS_TIGERLAKE(dev_priv));
  96                 return PCH_TGP;
  97         case INTEL_PCH_JSP_DEVICE_ID_TYPE:
  98         case INTEL_PCH_JSP2_DEVICE_ID_TYPE:
  99                 drm_dbg_kms(&dev_priv->drm, "Found Jasper Lake PCH\n");
 100                 WARN_ON(!IS_ELKHARTLAKE(dev_priv));
 101                 return PCH_JSP;
 102         default:
 103                 return PCH_NONE;
 104         }
 105 }
 106
 107 static bool intel_is_virt_pch(unsigned short id,
 108                               unsigned short svendor, unsigned short sdevice)
 109 {
 110         return (id == INTEL_PCH_P2X_DEVICE_ID_TYPE ||
 111                 id == INTEL_PCH_P3X_DEVICE_ID_TYPE ||
 112                 (id == INTEL_PCH_QEMU_DEVICE_ID_TYPE &&
 113                  svendor == PCI_SUBVENDOR_ID_REDHAT_QUMRANET &&
 114                  sdevice == PCI_SUBDEVICE_ID_QEMU));
 115 }
 116
 117 static unsigned short
 118 intel_virt_detect_pch(const struct drm_i915_private *dev_priv)
 119 {
 120         unsigned short id = 0;
 121
 122         /*
 123          * In a virtualized passthrough environment we can be in a
 124          * setup where the ISA bridge is not able to be passed through.
 125          * In this case, a south bridge can be emulated and we have to
 126          * make an educated guess as to which PCH is really there.
 127          */
 128
 129         if (IS_TIGERLAKE(dev_priv))
 130                 id = INTEL_PCH_TGP_DEVICE_ID_TYPE;
 131         else if (IS_ELKHARTLAKE(dev_priv))
 132                 id = INTEL_PCH_MCC_DEVICE_ID_TYPE;
 133         else if (IS_ICELAKE(dev_priv))
 134                 id = INTEL_PCH_ICP_DEVICE_ID_TYPE;
 135         else if (IS_CANNONLAKE(dev_priv) || IS_COFFEELAKE(dev_priv))
 136                 id = INTEL_PCH_CNP_DEVICE_ID_TYPE;
 137         else if (IS_KABYLAKE(dev_priv) || IS_SKYLAKE(dev_priv))
 138                 id = INTEL_PCH_SPT_DEVICE_ID_TYPE;
 139         else if (IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv))
 140                 id = INTEL_PCH_LPT_LP_DEVICE_ID_TYPE;
 141         else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
 142                 id = INTEL_PCH_LPT_DEVICE_ID_TYPE;
 143         else if (IS_GEN(dev_priv, 6) || IS_IVYBRIDGE(dev_priv))
 144                 id = INTEL_PCH_CPT_DEVICE_ID_TYPE;
 145         else if (IS_GEN(dev_priv, 5))
 146                 id = INTEL_PCH_IBX_DEVICE_ID_TYPE;
 147
 148         if (id)
 149                 drm_dbg_kms(&dev_priv->drm, "Assuming PCH ID %04x\n", id);
 150         else
 151                 drm_dbg_kms(&dev_priv->drm, "Assuming no PCH\n");
 152
 153         return id;
 154 }
 155
 156 void intel_detect_pch(struct drm_i915_private *dev_priv)
 157 {
 158         struct pci_dev *pch = NULL;
 159
 160         /*
 161          * The reason to probe ISA bridge instead of Dev31:Fun0 is to
 162          * make graphics device passthrough work easy for VMM, that only
 163          * need to expose ISA bridge to let driver know the real hardware
 164          * underneath. This is a requirement from virtualization team.
 165          *
 166          * In some virtualized environments (e.g. XEN), there is irrelevant
 167          * ISA bridge in the system. To work reliably, we should scan trhough
 168          * all the ISA bridge devices and check for the first match, instead
 169          * of only checking the first one.
 170          */
 171         while ((pch = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, pch))) {
 172                 unsigned short id;
 173                 enum intel_pch pch_type;
 174
 175                 if (pch->vendor != PCI_VENDOR_ID_INTEL)
 176                         continue;
 177
 178                 id = pch->device & INTEL_PCH_DEVICE_ID_MASK;
 179
 180                 pch_type = intel_pch_type(dev_priv, id);
 181                 if (pch_type != PCH_NONE) {
 182                         dev_priv->pch_type = pch_type;
 183                         dev_priv->pch_id = id;
 184                         break;
 185                 } else if (intel_is_virt_pch(id, pch->subsystem_vendor,
 186                                              pch->subsystem_device)) {
 187                         id = intel_virt_detect_pch(dev_priv);
 188                         pch_type = intel_pch_type(dev_priv, id);
 189
 190                         /* Sanity check virtual PCH id */
 191                         if (WARN_ON(id && pch_type == PCH_NONE))
 192                                 id = 0;
 193
 194                         dev_priv->pch_type = pch_type;
 195                         dev_priv->pch_id = id;
 196                         break;
 197                 }
 198         }
 199
 200         /*
 201          * Use PCH_NOP (PCH but no South Display) for PCH platforms without
 202          * display.
 203          */
 204         if (pch && !HAS_DISPLAY(dev_priv)) {
 205                 drm_dbg_kms(&dev_priv->drm,
 206                             "Display disabled, reverting to NOP PCH\n");
 207                 dev_priv->pch_type = PCH_NOP;
 208                 dev_priv->pch_id = 0;
 209         }
 210
 211         if (!pch)
 212                 drm_dbg_kms(&dev_priv->drm, "No PCH found.\n");
 213
 214         pci_dev_put(pch);
 215 }