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

#include <linux/device.h>

#include <drm/drm_drv.h>

#include "i915_drv.h"
#include "i915_reg.h"
#include "i915_utils.h"

#include <sys/syslog.h>

void add_taint_for_CI(struct drm_i915_private *i915, unsigned int taint)
{
        drm_notice(&i915->drm, "CI tainted: %#x by %pS\n",
                   taint, __builtin_return_address(0));

        /* Failures that occur during fault injection testing are expected */
        if (!i915_error_injected())
                __add_taint_for_CI(taint);
}

#if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
static unsigned int i915_probe_fail_count;

int __i915_inject_probe_error(struct drm_i915_private *i915, int err,
                              const char *func, int line)
{
        if (i915_probe_fail_count >= i915_modparams.inject_probe_failure)
                return 0;

        if (++i915_probe_fail_count < i915_modparams.inject_probe_failure)
                return 0;

        drm_info(&i915->drm, "Injecting failure %d at checkpoint %u [%s:%d]\n",
                 err, i915_modparams.inject_probe_failure, func, line);

        i915_modparams.inject_probe_failure = 0;
        return err;
}

bool i915_error_injected(void)
{
        return i915_probe_fail_count && !i915_modparams.inject_probe_failure;
}

#endif

bool i915_vtd_active(struct drm_i915_private *i915)
{
        return false;
#ifdef notyet
        if (device_iommu_mapped(i915->drm.dev))
                return true;

        /* Running as a guest, we assume the host is enforcing VT'd */
        return i915_run_as_guest();
#endif
}

bool i915_direct_stolen_access(struct drm_i915_private *i915)
{
        /*
         * Wa_22018444074
         *
         * Access via BAR can hang MTL, go directly to GSM/DSM,
         * except for VM guests which won't have access to it.
         *
         * Normally this would not work but on MTL the system firmware
         * should have relaxed the access permissions sufficiently.
         * 0x138914==0x1 indicates that the firmware has done its job.
         */
        return IS_METEORLAKE(i915) && !i915_run_as_guest() &&
                intel_uncore_read(&i915->uncore, MTL_PCODE_STOLEN_ACCESS) == STOLEN_ACCESS_ALLOWED;
}