[linux-2.6-block.git] / drivers / gpu / drm / i915 / intel_pch.c

// SPDX-License-Identifier: MIT
/*
 * Copyright 2019 Intel Corporation.
 */

#include "i915_drv.h"
#include "intel_pch.h"

/* Map PCH device id to PCH type, or PCH_NONE if unknown. */
static enum intel_pch
intel_pch_type(const struct drm_i915_private *dev_priv, unsigned short id)
{
	switch (id) {
	case INTEL_PCH_IBX_DEVICE_ID_TYPE:
		DRM_DEBUG_KMS("Found Ibex Peak PCH\n");
		WARN_ON(!IS_GEN(dev_priv, 5));
		return PCH_IBX;
	case INTEL_PCH_CPT_DEVICE_ID_TYPE:
		DRM_DEBUG_KMS("Found CougarPoint PCH\n");
		WARN_ON(!IS_GEN(dev_priv, 6) && !IS_IVYBRIDGE(dev_priv));
		return PCH_CPT;
	case INTEL_PCH_PPT_DEVICE_ID_TYPE:
		DRM_DEBUG_KMS("Found PantherPoint PCH\n");
		WARN_ON(!IS_GEN(dev_priv, 6) && !IS_IVYBRIDGE(dev_priv));
		/* PantherPoint is CPT compatible */
		return PCH_CPT;
	case INTEL_PCH_LPT_DEVICE_ID_TYPE:
		DRM_DEBUG_KMS("Found LynxPoint PCH\n");
		WARN_ON(!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
		WARN_ON(IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv));
		return PCH_LPT;
	case INTEL_PCH_LPT_LP_DEVICE_ID_TYPE:
		DRM_DEBUG_KMS("Found LynxPoint LP PCH\n");
		WARN_ON(!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
		WARN_ON(!IS_HSW_ULT(dev_priv) && !IS_BDW_ULT(dev_priv));
		return PCH_LPT;
	case INTEL_PCH_WPT_DEVICE_ID_TYPE:
		DRM_DEBUG_KMS("Found WildcatPoint PCH\n");
		WARN_ON(!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
		WARN_ON(IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv));
		/* WildcatPoint is LPT compatible */
		return PCH_LPT;
	case INTEL_PCH_WPT_LP_DEVICE_ID_TYPE:
		DRM_DEBUG_KMS("Found WildcatPoint LP PCH\n");
		WARN_ON(!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
		WARN_ON(!IS_HSW_ULT(dev_priv) && !IS_BDW_ULT(dev_priv));
		/* WildcatPoint is LPT compatible */
		return PCH_LPT;
	case INTEL_PCH_SPT_DEVICE_ID_TYPE:
		DRM_DEBUG_KMS("Found SunrisePoint PCH\n");
		WARN_ON(!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv));
		return PCH_SPT;
	case INTEL_PCH_SPT_LP_DEVICE_ID_TYPE:
		DRM_DEBUG_KMS("Found SunrisePoint LP PCH\n");
		WARN_ON(!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv) &&
			!IS_COFFEELAKE(dev_priv));
		return PCH_SPT;
	case INTEL_PCH_KBP_DEVICE_ID_TYPE:
		DRM_DEBUG_KMS("Found Kaby Lake PCH (KBP)\n");
		WARN_ON(!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv) &&
			!IS_COFFEELAKE(dev_priv));
		/* KBP is SPT compatible */
		return PCH_SPT;
	case INTEL_PCH_CNP_DEVICE_ID_TYPE:
	case INTEL_PCH_CNP2_DEVICE_ID_TYPE:
		DRM_DEBUG_KMS("Found Cannon Lake PCH (CNP)\n");
		WARN_ON(!IS_CANNONLAKE(dev_priv) && !IS_COFFEELAKE(dev_priv));
		return PCH_CNP;
	case INTEL_PCH_CNP_LP_DEVICE_ID_TYPE:
		DRM_DEBUG_KMS("Found Cannon Lake LP PCH (CNP-LP)\n");
		WARN_ON(!IS_CANNONLAKE(dev_priv) && !IS_COFFEELAKE(dev_priv));
		return PCH_CNP;
	case INTEL_PCH_CMP_DEVICE_ID_TYPE:
	case INTEL_PCH_CMP2_DEVICE_ID_TYPE:
		DRM_DEBUG_KMS("Found Comet Lake PCH (CMP)\n");
		WARN_ON(!IS_COFFEELAKE(dev_priv));
		/* CometPoint is CNP Compatible */
		return PCH_CNP;
	case INTEL_PCH_ICP_DEVICE_ID_TYPE:
		DRM_DEBUG_KMS("Found Ice Lake PCH\n");
		WARN_ON(!IS_ICELAKE(dev_priv));
		return PCH_ICP;
	case INTEL_PCH_MCC_DEVICE_ID_TYPE:
		DRM_DEBUG_KMS("Found Mule Creek Canyon PCH\n");
		WARN_ON(!IS_ELKHARTLAKE(dev_priv));
		return PCH_MCC;
	case INTEL_PCH_TGP_DEVICE_ID_TYPE:
		DRM_DEBUG_KMS("Found Tiger Lake LP PCH\n");
		WARN_ON(!IS_TIGERLAKE(dev_priv));
		return PCH_TGP;
	case INTEL_PCH_JSP_DEVICE_ID_TYPE:
	case INTEL_PCH_JSP2_DEVICE_ID_TYPE:
		DRM_DEBUG_KMS("Found Jasper Lake PCH\n");
		WARN_ON(!IS_ELKHARTLAKE(dev_priv));
		return PCH_JSP;
	default:
		return PCH_NONE;
	}
}

static bool intel_is_virt_pch(unsigned short id,
			      unsigned short svendor, unsigned short sdevice)
{
	return (id == INTEL_PCH_P2X_DEVICE_ID_TYPE ||
		id == INTEL_PCH_P3X_DEVICE_ID_TYPE ||
		(id == INTEL_PCH_QEMU_DEVICE_ID_TYPE &&
		 svendor == PCI_SUBVENDOR_ID_REDHAT_QUMRANET &&
		 sdevice == PCI_SUBDEVICE_ID_QEMU));
}

static unsigned short
intel_virt_detect_pch(const struct drm_i915_private *dev_priv)
{
	unsigned short id = 0;

	/*
	 * In a virtualized passthrough environment we can be in a
	 * setup where the ISA bridge is not able to be passed through.
	 * In this case, a south bridge can be emulated and we have to
	 * make an educated guess as to which PCH is really there.
	 */

	if (IS_TIGERLAKE(dev_priv))
		id = INTEL_PCH_TGP_DEVICE_ID_TYPE;
	else if (IS_ELKHARTLAKE(dev_priv))
		id = INTEL_PCH_MCC_DEVICE_ID_TYPE;
	else if (IS_ICELAKE(dev_priv))
		id = INTEL_PCH_ICP_DEVICE_ID_TYPE;
	else if (IS_CANNONLAKE(dev_priv) || IS_COFFEELAKE(dev_priv))
		id = INTEL_PCH_CNP_DEVICE_ID_TYPE;
	else if (IS_KABYLAKE(dev_priv) || IS_SKYLAKE(dev_priv))
		id = INTEL_PCH_SPT_DEVICE_ID_TYPE;
	else if (IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv))
		id = INTEL_PCH_LPT_LP_DEVICE_ID_TYPE;
	else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
		id = INTEL_PCH_LPT_DEVICE_ID_TYPE;
	else if (IS_GEN(dev_priv, 6) || IS_IVYBRIDGE(dev_priv))
		id = INTEL_PCH_CPT_DEVICE_ID_TYPE;
	else if (IS_GEN(dev_priv, 5))
		id = INTEL_PCH_IBX_DEVICE_ID_TYPE;

	if (id)
		DRM_DEBUG_KMS("Assuming PCH ID %04x\n", id);
	else
		DRM_DEBUG_KMS("Assuming no PCH\n");

	return id;
}

void intel_detect_pch(struct drm_i915_private *dev_priv)
{
	struct pci_dev *pch = NULL;

	/*
	 * The reason to probe ISA bridge instead of Dev31:Fun0 is to
	 * make graphics device passthrough work easy for VMM, that only
	 * need to expose ISA bridge to let driver know the real hardware
	 * underneath. This is a requirement from virtualization team.
	 *
	 * In some virtualized environments (e.g. XEN), there is irrelevant
	 * ISA bridge in the system. To work reliably, we should scan trhough
	 * all the ISA bridge devices and check for the first match, instead
	 * of only checking the first one.
	 */
	while ((pch = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, pch))) {
		unsigned short id;
		enum intel_pch pch_type;

		if (pch->vendor != PCI_VENDOR_ID_INTEL)
			continue;

		id = pch->device & INTEL_PCH_DEVICE_ID_MASK;

		pch_type = intel_pch_type(dev_priv, id);
		if (pch_type != PCH_NONE) {
			dev_priv->pch_type = pch_type;
			dev_priv->pch_id = id;
			break;
		} else if (intel_is_virt_pch(id, pch->subsystem_vendor,
					     pch->subsystem_device)) {
			id = intel_virt_detect_pch(dev_priv);
			pch_type = intel_pch_type(dev_priv, id);

			/* Sanity check virtual PCH id */
			if (WARN_ON(id && pch_type == PCH_NONE))
				id = 0;

			dev_priv->pch_type = pch_type;
			dev_priv->pch_id = id;
			break;
		}
	}

	/*
	 * Use PCH_NOP (PCH but no South Display) for PCH platforms without
	 * display.
	 */
	if (pch && !HAS_DISPLAY(dev_priv)) {
		DRM_DEBUG_KMS("Display disabled, reverting to NOP PCH\n");
		dev_priv->pch_type = PCH_NOP;
		dev_priv->pch_id = 0;
	}

	if (!pch)
		DRM_DEBUG_KMS("No PCH found.\n");

	pci_dev_put(pch);
}
Commit	Line	Data
707d26dc JN	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_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("Found SunrisePoint LP PCH\n");
a201b00e JA	55	WARN_ON(!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv) &&
a201b00e JA	56	!IS_COFFEELAKE(dev_priv));
707d26dc JN	57	return PCH_SPT;
	58	case INTEL_PCH_KBP_DEVICE_ID_TYPE:
	59	DRM_DEBUG_KMS("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:
37c92dc3	65	case INTEL_PCH_CNP2_DEVICE_ID_TYPE:
707d26dc JN	66	DRM_DEBUG_KMS("Found Cannon Lake PCH (CNP)\n");
	67	WARN_ON(!IS_CANNONLAKE(dev_priv) && !IS_COFFEELAKE(dev_priv));
	68	return PCH_CNP;
	69	case INTEL_PCH_CNP_LP_DEVICE_ID_TYPE:
	70	DRM_DEBUG_KMS("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:
8698ba53	74	case INTEL_PCH_CMP2_DEVICE_ID_TYPE:
707d26dc JN	75	DRM_DEBUG_KMS("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_ICP_DEVICE_ID_TYPE:
	80	DRM_DEBUG_KMS("Found Ice Lake PCH\n");
	81	WARN_ON(!IS_ICELAKE(dev_priv));
	82	return PCH_ICP;
	83	case INTEL_PCH_MCC_DEVICE_ID_TYPE:
707d26dc JN	84	DRM_DEBUG_KMS("Found Mule Creek Canyon PCH\n");
	85	WARN_ON(!IS_ELKHARTLAKE(dev_priv));
	86	return PCH_MCC;
	87	case INTEL_PCH_TGP_DEVICE_ID_TYPE:
	88	DRM_DEBUG_KMS("Found Tiger Lake LP PCH\n");
	89	WARN_ON(!IS_TIGERLAKE(dev_priv));
	90	return PCH_TGP;
943682e3 MR	91	case INTEL_PCH_JSP_DEVICE_ID_TYPE:
	92	case INTEL_PCH_JSP2_DEVICE_ID_TYPE:
	93	DRM_DEBUG_KMS("Found Jasper Lake PCH\n");
	94	WARN_ON(!IS_ELKHARTLAKE(dev_priv));
	95	return PCH_JSP;
707d26dc JN	96	default:
	97	return PCH_NONE;
	98	}
	99	}
	100
	101	static bool intel_is_virt_pch(unsigned short id,
	102	unsigned short svendor, unsigned short sdevice)
	103	{
	104	return (id == INTEL_PCH_P2X_DEVICE_ID_TYPE \|\|
	105	id == INTEL_PCH_P3X_DEVICE_ID_TYPE \|\|
	106	(id == INTEL_PCH_QEMU_DEVICE_ID_TYPE &&
	107	svendor == PCI_SUBVENDOR_ID_REDHAT_QUMRANET &&
	108	sdevice == PCI_SUBDEVICE_ID_QEMU));
	109	}
	110
	111	static unsigned short
	112	intel_virt_detect_pch(const struct drm_i915_private *dev_priv)
	113	{
	114	unsigned short id = 0;
	115
	116	/*
	117	* In a virtualized passthrough environment we can be in a
	118	* setup where the ISA bridge is not able to be passed through.
	119	* In this case, a south bridge can be emulated and we have to
	120	* make an educated guess as to which PCH is really there.
	121	*/
	122
	123	if (IS_TIGERLAKE(dev_priv))
	124	id = INTEL_PCH_TGP_DEVICE_ID_TYPE;
	125	else if (IS_ELKHARTLAKE(dev_priv))
	126	id = INTEL_PCH_MCC_DEVICE_ID_TYPE;
	127	else if (IS_ICELAKE(dev_priv))
	128	id = INTEL_PCH_ICP_DEVICE_ID_TYPE;
	129	else if (IS_CANNONLAKE(dev_priv) \|\| IS_COFFEELAKE(dev_priv))
	130	id = INTEL_PCH_CNP_DEVICE_ID_TYPE;
	131	else if (IS_KABYLAKE(dev_priv) \|\| IS_SKYLAKE(dev_priv))
	132	id = INTEL_PCH_SPT_DEVICE_ID_TYPE;
	133	else if (IS_HSW_ULT(dev_priv) \|\| IS_BDW_ULT(dev_priv))
	134	id = INTEL_PCH_LPT_LP_DEVICE_ID_TYPE;
	135	else if (IS_HASWELL(dev_priv) \|\| IS_BROADWELL(dev_priv))
	136	id = INTEL_PCH_LPT_DEVICE_ID_TYPE;
	137	else if (IS_GEN(dev_priv, 6) \|\| IS_IVYBRIDGE(dev_priv))
	138	id = INTEL_PCH_CPT_DEVICE_ID_TYPE;
	139	else if (IS_GEN(dev_priv, 5))
	140	id = INTEL_PCH_IBX_DEVICE_ID_TYPE;
	141
	142	if (id)
	143	DRM_DEBUG_KMS("Assuming PCH ID %04x\n", id);
	144	else
	145	DRM_DEBUG_KMS("Assuming no PCH\n");
	146
	147	return id;
	148	}
	149
	150	void intel_detect_pch(struct drm_i915_private *dev_priv)
	151	{
	152	struct pci_dev *pch = NULL;
	153
	154	/*
	155	* The reason to probe ISA bridge instead of Dev31:Fun0 is to
	156	* make graphics device passthrough work easy for VMM, that only
	157	* need to expose ISA bridge to let driver know the real hardware
	158	* underneath. This is a requirement from virtualization team.
	159	*
160	* In some virtualized environments (e.g. XEN), there is irrelevant
161	* ISA bridge in the system. To work reliably, we should scan trhough
162	* all the ISA bridge devices and check for the first match, instead
163	* of only checking the first one.
164	*/
165	while ((pch = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, pch))) {
166	unsigned short id;
167	enum intel_pch pch_type;
168
169	if (pch->vendor != PCI_VENDOR_ID_INTEL)
170	continue;
171
172	id = pch->device & INTEL_PCH_DEVICE_ID_MASK;
173
174	pch_type = intel_pch_type(dev_priv, id);
175	if (pch_type != PCH_NONE) {
176	dev_priv->pch_type = pch_type;
177	dev_priv->pch_id = id;
178	break;
179	} else if (intel_is_virt_pch(id, pch->subsystem_vendor,
180	pch->subsystem_device)) {
181	id = intel_virt_detect_pch(dev_priv);
182	pch_type = intel_pch_type(dev_priv, id);
183
184	/* Sanity check virtual PCH id */
185	if (WARN_ON(id && pch_type == PCH_NONE))
186	id = 0;
187
188	dev_priv->pch_type = pch_type;
189	dev_priv->pch_id = id;
190	break;
191	}
192	}
193
194	/*
195	* Use PCH_NOP (PCH but no South Display) for PCH platforms without
196	* display.
197	*/
198	if (pch && !HAS_DISPLAY(dev_priv)) {
199	DRM_DEBUG_KMS("Display disabled, reverting to NOP PCH\n");
200	dev_priv->pch_type = PCH_NOP;
201	dev_priv->pch_id = 0;
202	}
203
204	if (!pch)
205	DRM_DEBUG_KMS("No PCH found.\n");
206
207	pci_dev_put(pch);
208	}