1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2019 Intel Corporation 4 */ 5 6 #include <linux/device.h> 7 8 #include <drm/drm_drv.h> 9 #include <drm/drm_print.h> 10 11 #include "i915_drv.h" 12 #include "i915_reg.h" 13 #include "i915_utils.h" 14 15 void add_taint_for_CI(struct drm_i915_private *i915, unsigned int taint) 16 { 17 drm_notice(&i915->drm, "CI tainted: %#x by %pS\n", 18 taint, __builtin_return_address(0)); 19 20 __add_taint_for_CI(taint); 21 } 22 23 bool i915_vtd_active(struct drm_i915_private *i915) 24 { 25 if (device_iommu_mapped(i915->drm.dev)) 26 return true; 27 28 /* Running as a guest, we assume the host is enforcing VT'd */ 29 return i915_run_as_guest(); 30 } 31 32 bool i915_direct_stolen_access(struct drm_i915_private *i915) 33 { 34 /* 35 * Wa_22018444074 36 * 37 * Access via BAR can hang MTL, go directly to GSM/DSM, 38 * except for VM guests which won't have access to it. 39 * 40 * Normally this would not work but on MTL the system firmware 41 * should have relaxed the access permissions sufficiently. 42 * 0x138914==0x1 indicates that the firmware has done its job. 43 */ 44 return IS_METEORLAKE(i915) && !i915_run_as_guest() && 45 intel_uncore_read(&i915->uncore, MTL_PCODE_STOLEN_ACCESS) == STOLEN_ACCESS_ALLOWED; 46 } 47