diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_pch.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_pch.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_pch.c b/drivers/gpu/drm/i915/intel_pch.c new file mode 100644 index 000000000000..fa864d8f2b73 --- /dev/null +++ b/drivers/gpu/drm/i915/intel_pch.c @@ -0,0 +1,201 @@ +// 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)); + 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: + 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: + 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: + case INTEL_PCH_MCC2_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; + 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); +} |