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 case INTEL_PCH_MTP_DEVICE_ID_TYPE:
144 case INTEL_PCH_MTP2_DEVICE_ID_TYPE:
145 drm_dbg_kms(&dev_priv->drm, "Found Meteor Lake PCH\n");
146 drm_WARN_ON(&dev_priv->drm, !IS_METEORLAKE(dev_priv));
147 return PCH_MTP;
148 default:
149 return PCH_NONE;
150 }
151 }
152
intel_is_virt_pch(unsigned short id,unsigned short svendor,unsigned short sdevice)153 static bool intel_is_virt_pch(unsigned short id,
154 unsigned short svendor, unsigned short sdevice)
155 {
156 return (id == INTEL_PCH_P2X_DEVICE_ID_TYPE ||
157 id == INTEL_PCH_P3X_DEVICE_ID_TYPE ||
158 (id == INTEL_PCH_QEMU_DEVICE_ID_TYPE &&
159 svendor == PCI_SUBVENDOR_ID_REDHAT_QUMRANET &&
160 sdevice == PCI_SUBDEVICE_ID_QEMU));
161 }
162
163 static void
intel_virt_detect_pch(const struct drm_i915_private * dev_priv,unsigned short * pch_id,enum intel_pch * pch_type)164 intel_virt_detect_pch(const struct drm_i915_private *dev_priv,
165 unsigned short *pch_id, enum intel_pch *pch_type)
166 {
167 unsigned short id = 0;
168
169 /*
170 * In a virtualized passthrough environment we can be in a
171 * setup where the ISA bridge is not able to be passed through.
172 * In this case, a south bridge can be emulated and we have to
173 * make an educated guess as to which PCH is really there.
174 */
175
176 if (IS_METEORLAKE(dev_priv))
177 id = INTEL_PCH_MTP_DEVICE_ID_TYPE;
178 else if (IS_ALDERLAKE_S(dev_priv) || IS_ALDERLAKE_P(dev_priv))
179 id = INTEL_PCH_ADP_DEVICE_ID_TYPE;
180 else if (IS_TIGERLAKE(dev_priv) || IS_ROCKETLAKE(dev_priv))
181 id = INTEL_PCH_TGP_DEVICE_ID_TYPE;
182 else if (IS_JASPERLAKE(dev_priv) || IS_ELKHARTLAKE(dev_priv))
183 id = INTEL_PCH_MCC_DEVICE_ID_TYPE;
184 else if (IS_ICELAKE(dev_priv))
185 id = INTEL_PCH_ICP_DEVICE_ID_TYPE;
186 else if (IS_COFFEELAKE(dev_priv) ||
187 IS_COMETLAKE(dev_priv))
188 id = INTEL_PCH_CNP_DEVICE_ID_TYPE;
189 else if (IS_KABYLAKE(dev_priv) || IS_SKYLAKE(dev_priv))
190 id = INTEL_PCH_SPT_DEVICE_ID_TYPE;
191 else if (IS_HASWELL_ULT(dev_priv) || IS_BROADWELL_ULT(dev_priv))
192 id = INTEL_PCH_LPT_LP_DEVICE_ID_TYPE;
193 else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
194 id = INTEL_PCH_LPT_DEVICE_ID_TYPE;
195 else if (GRAPHICS_VER(dev_priv) == 6 || IS_IVYBRIDGE(dev_priv))
196 id = INTEL_PCH_CPT_DEVICE_ID_TYPE;
197 else if (GRAPHICS_VER(dev_priv) == 5)
198 id = INTEL_PCH_IBX_DEVICE_ID_TYPE;
199
200 if (id)
201 drm_dbg_kms(&dev_priv->drm, "Assuming PCH ID %04x\n", id);
202 else
203 drm_dbg_kms(&dev_priv->drm, "Assuming no PCH\n");
204
205 *pch_type = intel_pch_type(dev_priv, id);
206
207 /* Sanity check virtual PCH id */
208 if (drm_WARN_ON(&dev_priv->drm,
209 id && *pch_type == PCH_NONE))
210 id = 0;
211
212 *pch_id = id;
213 }
214
215 static int
intel_pch_match(struct pci_attach_args * pa)216 intel_pch_match(struct pci_attach_args *pa)
217 {
218 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_INTEL &&
219 PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE &&
220 PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_ISA)
221 return 1;
222 return 0;
223 }
224
intel_detect_pch(struct drm_i915_private * dev_priv)225 void intel_detect_pch(struct drm_i915_private *dev_priv)
226 {
227 struct pci_attach_args pa;
228 unsigned short id;
229 enum intel_pch pch_type;
230 pcireg_t subsys;
231
232 /* DG1 has south engine display on the same PCI device */
233 if (IS_DG1(dev_priv)) {
234 dev_priv->pch_type = PCH_DG1;
235 return;
236 } else if (IS_DG2(dev_priv)) {
237 dev_priv->pch_type = PCH_DG2;
238 return;
239 }
240
241 /*
242 * The reason to probe ISA bridge instead of Dev31:Fun0 is to
243 * make graphics device passthrough work easy for VMM, that only
244 * need to expose ISA bridge to let driver know the real hardware
245 * underneath. This is a requirement from virtualization team.
246 *
247 * In some virtualized environments (e.g. XEN), there is irrelevant
248 * ISA bridge in the system. To work reliably, we should scan trhough
249 * all the ISA bridge devices and check for the first match, instead
250 * of only checking the first one.
251 */
252 if (pci_find_device(&pa, intel_pch_match)) {
253 id = PCI_PRODUCT(pa.pa_id) & INTEL_PCH_DEVICE_ID_MASK;
254 subsys = pci_conf_read(pa.pa_pc, pa.pa_tag, PCI_SUBSYS_ID_REG);
255
256 pch_type = intel_pch_type(dev_priv, id);
257 if (pch_type != PCH_NONE) {
258 dev_priv->pch_type = pch_type;
259 dev_priv->pch_id = id;
260 } else if (intel_is_virt_pch(id, PCI_VENDOR(subsys),
261 PCI_PRODUCT(subsys))) {
262 intel_virt_detect_pch(dev_priv, &id, &pch_type);
263 dev_priv->pch_type = pch_type;
264 dev_priv->pch_id = id;
265 }
266 }
267
268 /*
269 * Use PCH_NOP (PCH but no South Display) for PCH platforms without
270 * display.
271 */
272 if (pci_find_device(&pa, intel_pch_match) && !HAS_DISPLAY(dev_priv)) {
273 drm_dbg_kms(&dev_priv->drm,
274 "Display disabled, reverting to NOP PCH\n");
275 dev_priv->pch_type = PCH_NOP;
276 dev_priv->pch_id = 0;
277 } else if (!pci_find_device(&pa, intel_pch_match)) {
278 if (i915_run_as_guest() && HAS_DISPLAY(dev_priv)) {
279 intel_virt_detect_pch(dev_priv, &id, &pch_type);
280 dev_priv->pch_type = pch_type;
281 dev_priv->pch_id = id;
282 } else {
283 drm_dbg_kms(&dev_priv->drm, "No PCH found.\n");
284 }
285 }
286
287 pci_dev_put(pch);
288 }
289