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Merge tag 'cxl-for-6.0' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl
[linux.git] / 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 "i915_utils.h"
8 #include "intel_pch.h"
9
10 /* Map PCH device id to PCH type, or PCH_NONE if unknown. */
11 static enum intel_pch
12 intel_pch_type(const struct drm_i915_private *dev_priv, unsigned short id)
13 {
14         switch (id) {
15         case INTEL_PCH_IBX_DEVICE_ID_TYPE:
16                 drm_dbg_kms(&dev_priv->drm, "Found Ibex Peak PCH\n");
17                 drm_WARN_ON(&dev_priv->drm, GRAPHICS_VER(dev_priv) != 5);
18                 return PCH_IBX;
19         case INTEL_PCH_CPT_DEVICE_ID_TYPE:
20                 drm_dbg_kms(&dev_priv->drm, "Found CougarPoint PCH\n");
21                 drm_WARN_ON(&dev_priv->drm,
22                             GRAPHICS_VER(dev_priv) != 6 && !IS_IVYBRIDGE(dev_priv));
23                 return PCH_CPT;
24         case INTEL_PCH_PPT_DEVICE_ID_TYPE:
25                 drm_dbg_kms(&dev_priv->drm, "Found PantherPoint PCH\n");
26                 drm_WARN_ON(&dev_priv->drm,
27                             GRAPHICS_VER(dev_priv) != 6 && !IS_IVYBRIDGE(dev_priv));
28                 /* PPT is CPT compatible */
29                 return PCH_CPT;
30         case INTEL_PCH_LPT_DEVICE_ID_TYPE:
31                 drm_dbg_kms(&dev_priv->drm, "Found LynxPoint PCH\n");
32                 drm_WARN_ON(&dev_priv->drm,
33                             !IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
34                 drm_WARN_ON(&dev_priv->drm,
35                             IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv));
36                 return PCH_LPT;
37         case INTEL_PCH_LPT_LP_DEVICE_ID_TYPE:
38                 drm_dbg_kms(&dev_priv->drm, "Found LynxPoint LP PCH\n");
39                 drm_WARN_ON(&dev_priv->drm,
40                             !IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
41                 drm_WARN_ON(&dev_priv->drm,
42                             !IS_HSW_ULT(dev_priv) && !IS_BDW_ULT(dev_priv));
43                 return PCH_LPT;
44         case INTEL_PCH_WPT_DEVICE_ID_TYPE:
45                 drm_dbg_kms(&dev_priv->drm, "Found WildcatPoint PCH\n");
46                 drm_WARN_ON(&dev_priv->drm,
47                             !IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
48                 drm_WARN_ON(&dev_priv->drm,
49                             IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv));
50                 /* WPT is LPT compatible */
51                 return PCH_LPT;
52         case INTEL_PCH_WPT_LP_DEVICE_ID_TYPE:
53                 drm_dbg_kms(&dev_priv->drm, "Found WildcatPoint LP PCH\n");
54                 drm_WARN_ON(&dev_priv->drm,
55                             !IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
56                 drm_WARN_ON(&dev_priv->drm,
57                             !IS_HSW_ULT(dev_priv) && !IS_BDW_ULT(dev_priv));
58                 /* WPT is LPT compatible */
59                 return PCH_LPT;
60         case INTEL_PCH_SPT_DEVICE_ID_TYPE:
61                 drm_dbg_kms(&dev_priv->drm, "Found SunrisePoint PCH\n");
62                 drm_WARN_ON(&dev_priv->drm,
63                             !IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv));
64                 return PCH_SPT;
65         case INTEL_PCH_SPT_LP_DEVICE_ID_TYPE:
66                 drm_dbg_kms(&dev_priv->drm, "Found SunrisePoint LP PCH\n");
67                 drm_WARN_ON(&dev_priv->drm,
68                             !IS_SKYLAKE(dev_priv) &&
69                             !IS_KABYLAKE(dev_priv) &&
70                             !IS_COFFEELAKE(dev_priv) &&
71                             !IS_COMETLAKE(dev_priv));
72                 return PCH_SPT;
73         case INTEL_PCH_KBP_DEVICE_ID_TYPE:
74                 drm_dbg_kms(&dev_priv->drm, "Found Kaby Lake PCH (KBP)\n");
75                 drm_WARN_ON(&dev_priv->drm,
76                             !IS_SKYLAKE(dev_priv) &&
77                             !IS_KABYLAKE(dev_priv) &&
78                             !IS_COFFEELAKE(dev_priv) &&
79                             !IS_COMETLAKE(dev_priv));
80                 /* KBP is SPT compatible */
81                 return PCH_SPT;
82         case INTEL_PCH_CNP_DEVICE_ID_TYPE:
83                 drm_dbg_kms(&dev_priv->drm, "Found Cannon Lake PCH (CNP)\n");
84                 drm_WARN_ON(&dev_priv->drm,
85                             !IS_COFFEELAKE(dev_priv) &&
86                             !IS_COMETLAKE(dev_priv));
87                 return PCH_CNP;
88         case INTEL_PCH_CNP_LP_DEVICE_ID_TYPE:
89                 drm_dbg_kms(&dev_priv->drm,
90                             "Found Cannon Lake LP PCH (CNP-LP)\n");
91                 drm_WARN_ON(&dev_priv->drm,
92                             !IS_COFFEELAKE(dev_priv) &&
93                             !IS_COMETLAKE(dev_priv));
94                 return PCH_CNP;
95         case INTEL_PCH_CMP_DEVICE_ID_TYPE:
96         case INTEL_PCH_CMP2_DEVICE_ID_TYPE:
97                 drm_dbg_kms(&dev_priv->drm, "Found Comet Lake PCH (CMP)\n");
98                 drm_WARN_ON(&dev_priv->drm,
99                             !IS_COFFEELAKE(dev_priv) &&
100                             !IS_COMETLAKE(dev_priv) &&
101                             !IS_ROCKETLAKE(dev_priv));
102                 /* CMP is CNP compatible */
103                 return PCH_CNP;
104         case INTEL_PCH_CMP_V_DEVICE_ID_TYPE:
105                 drm_dbg_kms(&dev_priv->drm, "Found Comet Lake V PCH (CMP-V)\n");
106                 drm_WARN_ON(&dev_priv->drm,
107                             !IS_COFFEELAKE(dev_priv) &&
108                             !IS_COMETLAKE(dev_priv));
109                 /* CMP-V is based on KBP, which is SPT compatible */
110                 return PCH_SPT;
111         case INTEL_PCH_ICP_DEVICE_ID_TYPE:
112         case INTEL_PCH_ICP2_DEVICE_ID_TYPE:
113                 drm_dbg_kms(&dev_priv->drm, "Found Ice Lake PCH\n");
114                 drm_WARN_ON(&dev_priv->drm, !IS_ICELAKE(dev_priv));
115                 return PCH_ICP;
116         case INTEL_PCH_MCC_DEVICE_ID_TYPE:
117                 drm_dbg_kms(&dev_priv->drm, "Found Mule Creek Canyon PCH\n");
118                 drm_WARN_ON(&dev_priv->drm, !IS_JSL_EHL(dev_priv));
119                 /* MCC is TGP compatible */
120                 return PCH_TGP;
121         case INTEL_PCH_TGP_DEVICE_ID_TYPE:
122         case INTEL_PCH_TGP2_DEVICE_ID_TYPE:
123                 drm_dbg_kms(&dev_priv->drm, "Found Tiger Lake LP PCH\n");
124                 drm_WARN_ON(&dev_priv->drm, !IS_TIGERLAKE(dev_priv) &&
125                             !IS_ROCKETLAKE(dev_priv) &&
126                             !IS_GEN9_BC(dev_priv));
127                 return PCH_TGP;
128         case INTEL_PCH_JSP_DEVICE_ID_TYPE:
129                 drm_dbg_kms(&dev_priv->drm, "Found Jasper Lake PCH\n");
130                 drm_WARN_ON(&dev_priv->drm, !IS_JSL_EHL(dev_priv));
131                 /* JSP is ICP compatible */
132                 return PCH_ICP;
133         case INTEL_PCH_ADP_DEVICE_ID_TYPE:
134         case INTEL_PCH_ADP2_DEVICE_ID_TYPE:
135         case INTEL_PCH_ADP3_DEVICE_ID_TYPE:
136         case INTEL_PCH_ADP4_DEVICE_ID_TYPE:
137                 drm_dbg_kms(&dev_priv->drm, "Found Alder Lake PCH\n");
138                 drm_WARN_ON(&dev_priv->drm, !IS_ALDERLAKE_S(dev_priv) &&
139                             !IS_ALDERLAKE_P(dev_priv));
140                 return PCH_ADP;
141         default:
142                 return PCH_NONE;
143         }
144 }
145
146 static bool intel_is_virt_pch(unsigned short id,
147                               unsigned short svendor, unsigned short sdevice)
148 {
149         return (id == INTEL_PCH_P2X_DEVICE_ID_TYPE ||
150                 id == INTEL_PCH_P3X_DEVICE_ID_TYPE ||
151                 (id == INTEL_PCH_QEMU_DEVICE_ID_TYPE &&
152                  svendor == PCI_SUBVENDOR_ID_REDHAT_QUMRANET &&
153                  sdevice == PCI_SUBDEVICE_ID_QEMU));
154 }
155
156 static void
157 intel_virt_detect_pch(const struct drm_i915_private *dev_priv,
158                       unsigned short *pch_id, enum intel_pch *pch_type)
159 {
160         unsigned short id = 0;
161
162         /*
163          * In a virtualized passthrough environment we can be in a
164          * setup where the ISA bridge is not able to be passed through.
165          * In this case, a south bridge can be emulated and we have to
166          * make an educated guess as to which PCH is really there.
167          */
168
169         if (IS_ALDERLAKE_S(dev_priv) || IS_ALDERLAKE_P(dev_priv))
170                 id = INTEL_PCH_ADP_DEVICE_ID_TYPE;
171         else if (IS_TIGERLAKE(dev_priv) || IS_ROCKETLAKE(dev_priv))
172                 id = INTEL_PCH_TGP_DEVICE_ID_TYPE;
173         else if (IS_JSL_EHL(dev_priv))
174                 id = INTEL_PCH_MCC_DEVICE_ID_TYPE;
175         else if (IS_ICELAKE(dev_priv))
176                 id = INTEL_PCH_ICP_DEVICE_ID_TYPE;
177         else if (IS_COFFEELAKE(dev_priv) ||
178                  IS_COMETLAKE(dev_priv))
179                 id = INTEL_PCH_CNP_DEVICE_ID_TYPE;
180         else if (IS_KABYLAKE(dev_priv) || IS_SKYLAKE(dev_priv))
181                 id = INTEL_PCH_SPT_DEVICE_ID_TYPE;
182         else if (IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv))
183                 id = INTEL_PCH_LPT_LP_DEVICE_ID_TYPE;
184         else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
185                 id = INTEL_PCH_LPT_DEVICE_ID_TYPE;
186         else if (GRAPHICS_VER(dev_priv) == 6 || IS_IVYBRIDGE(dev_priv))
187                 id = INTEL_PCH_CPT_DEVICE_ID_TYPE;
188         else if (GRAPHICS_VER(dev_priv) == 5)
189                 id = INTEL_PCH_IBX_DEVICE_ID_TYPE;
190
191         if (id)
192                 drm_dbg_kms(&dev_priv->drm, "Assuming PCH ID %04x\n", id);
193         else
194                 drm_dbg_kms(&dev_priv->drm, "Assuming no PCH\n");
195
196         *pch_type = intel_pch_type(dev_priv, id);
197
198         /* Sanity check virtual PCH id */
199         if (drm_WARN_ON(&dev_priv->drm,
200                         id && *pch_type == PCH_NONE))
201                 id = 0;
202
203         *pch_id = id;
204 }
205
206 void intel_detect_pch(struct drm_i915_private *dev_priv)
207 {
208         struct pci_dev *pch = NULL;
209         unsigned short id;
210         enum intel_pch pch_type;
211
212         /* DG1 has south engine display on the same PCI device */
213         if (IS_DG1(dev_priv)) {
214                 dev_priv->pch_type = PCH_DG1;
215                 return;
216         } else if (IS_DG2(dev_priv)) {
217                 dev_priv->pch_type = PCH_DG2;
218                 return;
219         }
220
221         /*
222          * The reason to probe ISA bridge instead of Dev31:Fun0 is to
223          * make graphics device passthrough work easy for VMM, that only
224          * need to expose ISA bridge to let driver know the real hardware
225          * underneath. This is a requirement from virtualization team.
226          *
227          * In some virtualized environments (e.g. XEN), there is irrelevant
228          * ISA bridge in the system. To work reliably, we should scan trhough
229          * all the ISA bridge devices and check for the first match, instead
230          * of only checking the first one.
231          */
232         while ((pch = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, pch))) {
233                 if (pch->vendor != PCI_VENDOR_ID_INTEL)
234                         continue;
235
236                 id = pch->device & INTEL_PCH_DEVICE_ID_MASK;
237
238                 pch_type = intel_pch_type(dev_priv, id);
239                 if (pch_type != PCH_NONE) {
240                         dev_priv->pch_type = pch_type;
241                         dev_priv->pch_id = id;
242                         break;
243                 } else if (intel_is_virt_pch(id, pch->subsystem_vendor,
244                                              pch->subsystem_device)) {
245                         intel_virt_detect_pch(dev_priv, &id, &pch_type);
246                         dev_priv->pch_type = pch_type;
247                         dev_priv->pch_id = id;
248                         break;
249                 }
250         }
251
252         /*
253          * Use PCH_NOP (PCH but no South Display) for PCH platforms without
254          * display.
255          */
256         if (pch && !HAS_DISPLAY(dev_priv)) {
257                 drm_dbg_kms(&dev_priv->drm,
258                             "Display disabled, reverting to NOP PCH\n");
259                 dev_priv->pch_type = PCH_NOP;
260                 dev_priv->pch_id = 0;
261         } else if (!pch) {
262                 if (i915_run_as_guest() && HAS_DISPLAY(dev_priv)) {
263                         intel_virt_detect_pch(dev_priv, &id, &pch_type);
264                         dev_priv->pch_type = pch_type;
265                         dev_priv->pch_id = id;
266                 } else {
267                         drm_dbg_kms(&dev_priv->drm, "No PCH found.\n");
268                 }
269         }
270
271         pci_dev_put(pch);
272 }
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