diff options
Diffstat (limited to 'drivers/gpu/drm/i915/pxp/intel_pxp_tee.c')
| -rw-r--r-- | drivers/gpu/drm/i915/pxp/intel_pxp_tee.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c new file mode 100644 index 000000000000..49508f31dcb7 --- /dev/null +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c @@ -0,0 +1,172 @@ +// 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); + intel_wakeref_t wakeref; + + mutex_lock(&pxp->tee_mutex); + pxp->pxp_component = data; + pxp->pxp_component->tee_dev = tee_kdev; + mutex_unlock(&pxp->tee_mutex); + + /* if we are suspended, the HW will be re-initialized on resume */ + wakeref = intel_runtime_pm_get_if_in_use(&i915->runtime_pm); + if (!wakeref) + return 0; + + /* the component is required to fully start the PXP HW */ + intel_pxp_init_hw(pxp); + + intel_runtime_pm_put(&i915->runtime_pm, wakeref); + + 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; +} |