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// SPDX-License-Identifier: MIT
/*
* Copyright(c) 2020 Intel Corporation.
*/
#include <linux/component.h>
#include "drm/i915_pxp_tee_interface.h"
#include "drm/i915_component.h"
#include "i915_drv.h"
#include "intel_pxp.h"
#include "intel_pxp_session.h"
#include "intel_pxp_tee.h"
#include "intel_pxp_tee_interface.h"
static inline struct intel_pxp *i915_dev_to_pxp(struct device *i915_kdev)
{
return &kdev_to_i915(i915_kdev)->gt.pxp;
}
static int intel_pxp_tee_io_message(struct intel_pxp *pxp,
void *msg_in, u32 msg_in_size,
void *msg_out, u32 msg_out_max_size,
u32 *msg_out_rcv_size)
{
struct drm_i915_private *i915 = pxp_to_gt(pxp)->i915;
struct i915_pxp_component *pxp_component = pxp->pxp_component;
int ret = 0;
mutex_lock(&pxp->tee_mutex);
/*
* The binding of the component is asynchronous from i915 probe, so we
* can't be sure it has happened.
*/
if (!pxp_component) {
ret = -ENODEV;
goto unlock;
}
ret = pxp_component->ops->send(pxp_component->tee_dev, msg_in, msg_in_size);
if (ret) {
drm_err(&i915->drm, "Failed to send PXP TEE message\n");
goto unlock;
}
ret = pxp_component->ops->recv(pxp_component->tee_dev, msg_out, msg_out_max_size);
if (ret < 0) {
drm_err(&i915->drm, "Failed to receive PXP TEE message\n");
goto unlock;
}
if (ret > msg_out_max_size) {
drm_err(&i915->drm,
"Failed to receive PXP TEE message due to unexpected output size\n");
ret = -ENOSPC;
goto unlock;
}
if (msg_out_rcv_size)
*msg_out_rcv_size = ret;
ret = 0;
unlock:
mutex_unlock(&pxp->tee_mutex);
return ret;
}
/**
* i915_pxp_tee_component_bind - bind function to pass the function pointers to pxp_tee
* @i915_kdev: pointer to i915 kernel device
* @tee_kdev: pointer to tee kernel device
* @data: pointer to pxp_tee_master containing the function pointers
*
* This bind function is called during the system boot or resume from system sleep.
*
* Return: return 0 if successful.
*/
static int i915_pxp_tee_component_bind(struct device *i915_kdev,
struct device *tee_kdev, void *data)
{
struct drm_i915_private *i915 = kdev_to_i915(i915_kdev);
struct intel_pxp *pxp = i915_dev_to_pxp(i915_kdev);
mutex_lock(&pxp->tee_mutex);
pxp->pxp_component = data;
pxp->pxp_component->tee_dev = tee_kdev;
mutex_unlock(&pxp->tee_mutex);
/* the component is required to fully start the PXP HW */
intel_pxp_init_hw(pxp);
if (!pxp->arb_is_valid) {
drm_err(&i915->drm, "Failed to create arb session during bind\n");
intel_pxp_fini_hw(pxp);
pxp->pxp_component = NULL;
return -EIO;
}
return 0;
}
static void i915_pxp_tee_component_unbind(struct device *i915_kdev,
struct device *tee_kdev, void *data)
{
struct intel_pxp *pxp = i915_dev_to_pxp(i915_kdev);
intel_pxp_fini_hw(pxp);
mutex_lock(&pxp->tee_mutex);
pxp->pxp_component = NULL;
mutex_unlock(&pxp->tee_mutex);
}
static const struct component_ops i915_pxp_tee_component_ops = {
.bind = i915_pxp_tee_component_bind,
.unbind = i915_pxp_tee_component_unbind,
};
int intel_pxp_tee_component_init(struct intel_pxp *pxp)
{
int ret;
struct intel_gt *gt = pxp_to_gt(pxp);
struct drm_i915_private *i915 = gt->i915;
ret = component_add_typed(i915->drm.dev, &i915_pxp_tee_component_ops,
I915_COMPONENT_PXP);
if (ret < 0) {
drm_err(&i915->drm, "Failed to add PXP component (%d)\n", ret);
return ret;
}
pxp->pxp_component_added = true;
return 0;
}
void intel_pxp_tee_component_fini(struct intel_pxp *pxp)
{
struct drm_i915_private *i915 = pxp_to_gt(pxp)->i915;
if (!pxp->pxp_component_added)
return;
component_del(i915->drm.dev, &i915_pxp_tee_component_ops);
pxp->pxp_component_added = false;
}
int intel_pxp_tee_cmd_create_arb_session(struct intel_pxp *pxp,
int arb_session_id)
{
struct drm_i915_private *i915 = pxp_to_gt(pxp)->i915;
struct pxp_tee_create_arb_in msg_in = {0};
struct pxp_tee_create_arb_out msg_out = {0};
int ret;
msg_in.header.api_version = PXP_TEE_APIVER;
msg_in.header.command_id = PXP_TEE_ARB_CMDID;
msg_in.header.buffer_len = sizeof(msg_in) - sizeof(msg_in.header);
msg_in.protection_mode = PXP_TEE_ARB_PROTECTION_MODE;
msg_in.session_id = arb_session_id;
ret = intel_pxp_tee_io_message(pxp,
&msg_in, sizeof(msg_in),
&msg_out, sizeof(msg_out),
NULL);
if (ret)
drm_err(&i915->drm, "Failed to send tee msg ret=[%d]\n", ret);
return ret;
}
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