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 /* Failures that occur during fault injection testing are expected */ 21 if (!i915_error_injected()) 22 __add_taint_for_CI(taint); 23 } 24 25 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG) 26 static unsigned int i915_probe_fail_count; 27 28 int __i915_inject_probe_error(struct drm_i915_private *i915, int err, 29 const char *func, int line) 30 { 31 if (i915_probe_fail_count >= i915_modparams.inject_probe_failure) 32 return 0; 33 34 if (++i915_probe_fail_count < i915_modparams.inject_probe_failure) 35 return 0; 36 37 drm_info(&i915->drm, "Injecting failure %d at checkpoint %u [%s:%d]\n", 38 err, i915_modparams.inject_probe_failure, func, line); 39 40 i915_modparams.inject_probe_failure = 0; 41 return err; 42 } 43 44 bool i915_error_injected(void) 45 { 46 return i915_probe_fail_count && !i915_modparams.inject_probe_failure; 47 } 48 49 #endif 50 51 bool i915_vtd_active(struct drm_i915_private *i915) 52 { 53 if (device_iommu_mapped(i915->drm.dev)) 54 return true; 55 56 /* Running as a guest, we assume the host is enforcing VT'd */ 57 return i915_run_as_guest(); 58 } 59 60 bool i915_direct_stolen_access(struct drm_i915_private *i915) 61 { 62 /* 63 * Wa_22018444074 64 * 65 * Access via BAR can hang MTL, go directly to GSM/DSM, 66 * except for VM guests which won't have access to it. 67 * 68 * Normally this would not work but on MTL the system firmware 69 * should have relaxed the access permissions sufficiently. 70 * 0x138914==0x1 indicates that the firmware has done its job. 71 */ 72 return IS_METEORLAKE(i915) && !i915_run_as_guest() && 73 intel_uncore_read(&i915->uncore, MTL_PCODE_STOLEN_ACCESS) == STOLEN_ACCESS_ALLOWED; 74 } 75