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
intel_pch_type(const struct drm_i915_private * dev_priv,unsigned short id)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_HASWELL_ULT(dev_priv) || IS_BROADWELL_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_HASWELL_ULT(dev_priv) && !IS_BROADWELL_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_HASWELL_ULT(dev_priv) || IS_BROADWELL_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_HASWELL_ULT(dev_priv) && !IS_BROADWELL_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_JASPERLAKE(dev_priv) ||
119 IS_ELKHARTLAKE(dev_priv)));
120 /* MCC is TGP compatible */
121 return PCH_TGP;
122 case INTEL_PCH_TGP_DEVICE_ID_TYPE:
123 case INTEL_PCH_TGP2_DEVICE_ID_TYPE:
124 drm_dbg_kms(&dev_priv->drm, "Found Tiger Lake LP PCH\n");
125 drm_WARN_ON(&dev_priv->drm, !IS_TIGERLAKE(dev_priv) &&
126 !IS_ROCKETLAKE(dev_priv) &&
127 !IS_GEN9_BC(dev_priv));
128 return PCH_TGP;
129 case INTEL_PCH_JSP_DEVICE_ID_TYPE:
130 drm_dbg_kms(&dev_priv->drm, "Found Jasper Lake PCH\n");
131 drm_WARN_ON(&dev_priv->drm, !(IS_JASPERLAKE(dev_priv) ||
132 IS_ELKHARTLAKE(dev_priv)));
133 /* JSP is ICP compatible */
134 return PCH_ICP;
135 case INTEL_PCH_ADP_DEVICE_ID_TYPE:
136 case INTEL_PCH_ADP2_DEVICE_ID_TYPE:
137 case INTEL_PCH_ADP3_DEVICE_ID_TYPE:
138 case INTEL_PCH_ADP4_DEVICE_ID_TYPE:
139 drm_dbg_kms(&dev_priv->drm, "Found Alder Lake PCH\n");
140 drm_WARN_ON(&dev_priv->drm, !IS_ALDERLAKE_S(dev_priv) &&
141 !IS_ALDERLAKE_P(dev_priv));
142 return PCH_ADP;
143 default:
144 return PCH_NONE;
145 }
146 }
147
intel_is_virt_pch(unsigned short id,unsigned short svendor,unsigned short sdevice)148 static bool intel_is_virt_pch(unsigned short id,
149 unsigned short svendor, unsigned short sdevice)
150 {
151 return (id == INTEL_PCH_P2X_DEVICE_ID_TYPE ||
152 id == INTEL_PCH_P3X_DEVICE_ID_TYPE ||
153 (id == INTEL_PCH_QEMU_DEVICE_ID_TYPE &&
154 svendor == PCI_SUBVENDOR_ID_REDHAT_QUMRANET &&
155 sdevice == PCI_SUBDEVICE_ID_QEMU));
156 }
157
158 static void
intel_virt_detect_pch(const struct drm_i915_private * dev_priv,unsigned short * pch_id,enum intel_pch * pch_type)159 intel_virt_detect_pch(const struct drm_i915_private *dev_priv,
160 unsigned short *pch_id, enum intel_pch *pch_type)
161 {
162 unsigned short id = 0;
163
164 /*
165 * In a virtualized passthrough environment we can be in a
166 * setup where the ISA bridge is not able to be passed through.
167 * In this case, a south bridge can be emulated and we have to
168 * make an educated guess as to which PCH is really there.
169 */
170
171 if (IS_ALDERLAKE_S(dev_priv) || IS_ALDERLAKE_P(dev_priv))
172 id = INTEL_PCH_ADP_DEVICE_ID_TYPE;
173 else if (IS_TIGERLAKE(dev_priv) || IS_ROCKETLAKE(dev_priv))
174 id = INTEL_PCH_TGP_DEVICE_ID_TYPE;
175 else if (IS_JASPERLAKE(dev_priv) || IS_ELKHARTLAKE(dev_priv))
176 id = INTEL_PCH_MCC_DEVICE_ID_TYPE;
177 else if (IS_ICELAKE(dev_priv))
178 id = INTEL_PCH_ICP_DEVICE_ID_TYPE;
179 else if (IS_COFFEELAKE(dev_priv) ||
180 IS_COMETLAKE(dev_priv))
181 id = INTEL_PCH_CNP_DEVICE_ID_TYPE;
182 else if (IS_KABYLAKE(dev_priv) || IS_SKYLAKE(dev_priv))
183 id = INTEL_PCH_SPT_DEVICE_ID_TYPE;
184 else if (IS_HASWELL_ULT(dev_priv) || IS_BROADWELL_ULT(dev_priv))
185 id = INTEL_PCH_LPT_LP_DEVICE_ID_TYPE;
186 else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
187 id = INTEL_PCH_LPT_DEVICE_ID_TYPE;
188 else if (GRAPHICS_VER(dev_priv) == 6 || IS_IVYBRIDGE(dev_priv))
189 id = INTEL_PCH_CPT_DEVICE_ID_TYPE;
190 else if (GRAPHICS_VER(dev_priv) == 5)
191 id = INTEL_PCH_IBX_DEVICE_ID_TYPE;
192
193 if (id)
194 drm_dbg_kms(&dev_priv->drm, "Assuming PCH ID %04x\n", id);
195 else
196 drm_dbg_kms(&dev_priv->drm, "Assuming no PCH\n");
197
198 *pch_type = intel_pch_type(dev_priv, id);
199
200 /* Sanity check virtual PCH id */
201 if (drm_WARN_ON(&dev_priv->drm,
202 id && *pch_type == PCH_NONE))
203 id = 0;
204
205 *pch_id = id;
206 }
207
intel_detect_pch(struct drm_i915_private * dev_priv)208 void intel_detect_pch(struct drm_i915_private *dev_priv)
209 {
210 struct pci_dev *pch = NULL;
211 unsigned short id;
212 enum intel_pch pch_type;
213
214 /*
215 * South display engine on the same PCI device: just assign the fake
216 * PCH.
217 */
218 if (DISPLAY_VER(dev_priv) >= 20) {
219 dev_priv->pch_type = PCH_LNL;
220 return;
221 } else if (IS_BATTLEMAGE(dev_priv) || IS_METEORLAKE(dev_priv)) {
222 /*
223 * Both north display and south display are on the SoC die.
224 * The real PCH (if it even exists) is uninvolved in display.
225 */
226 dev_priv->pch_type = PCH_MTL;
227 return;
228 } else if (IS_DG2(dev_priv)) {
229 dev_priv->pch_type = PCH_DG2;
230 return;
231 } else if (IS_DG1(dev_priv)) {
232 dev_priv->pch_type = PCH_DG1;
233 return;
234 }
235
236 /*
237 * The reason to probe ISA bridge instead of Dev31:Fun0 is to
238 * make graphics device passthrough work easy for VMM, that only
239 * need to expose ISA bridge to let driver know the real hardware
240 * underneath. This is a requirement from virtualization team.
241 *
242 * In some virtualized environments (e.g. XEN), there is irrelevant
243 * ISA bridge in the system. To work reliably, we should scan trhough
244 * all the ISA bridge devices and check for the first match, instead
245 * of only checking the first one.
246 */
247 while ((pch = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, pch))) {
248 if (pch->vendor != PCI_VENDOR_ID_INTEL)
249 continue;
250
251 id = pch->device & INTEL_PCH_DEVICE_ID_MASK;
252
253 pch_type = intel_pch_type(dev_priv, id);
254 if (pch_type != PCH_NONE) {
255 dev_priv->pch_type = pch_type;
256 dev_priv->pch_id = id;
257 break;
258 } else if (intel_is_virt_pch(id, pch->subsystem_vendor,
259 pch->subsystem_device)) {
260 intel_virt_detect_pch(dev_priv, &id, &pch_type);
261 dev_priv->pch_type = pch_type;
262 dev_priv->pch_id = id;
263 break;
264 }
265 }
266
267 /*
268 * Use PCH_NOP (PCH but no South Display) for PCH platforms without
269 * display.
270 */
271 if (pch && !HAS_DISPLAY(dev_priv)) {
272 drm_dbg_kms(&dev_priv->drm,
273 "Display disabled, reverting to NOP PCH\n");
274 dev_priv->pch_type = PCH_NOP;
275 dev_priv->pch_id = 0;
276 } else if (!pch) {
277 if (i915_run_as_guest() && HAS_DISPLAY(dev_priv)) {
278 intel_virt_detect_pch(dev_priv, &id, &pch_type);
279 dev_priv->pch_type = pch_type;
280 dev_priv->pch_id = id;
281 } else {
282 drm_dbg_kms(&dev_priv->drm, "No PCH found.\n");
283 }
284 }
285
286 pci_dev_put(pch);
287 }
288