// SPDX-License-Identifier: MIT
/*
* Copyright(c) 2020 Intel Corporation.
*/
#include <linux/component.h>
#include <drm/intel/i915_pxp_tee_interface.h>
#include <drm/intel/i915_component.h>
#include "gem/i915_gem_lmem.h"
#include "gt/intel_gt_print.h"
#include "i915_drv.h"
#include "gt/intel_gt.h"
#include "intel_pxp.h"
#include "intel_pxp_cmd_interface_42.h"
#include "intel_pxp_huc.h"
#include "intel_pxp_session.h"
#include "intel_pxp_tee.h"
#include "intel_pxp_types.h"
#define PXP_TRANSPORT_TIMEOUT_MS 5000 /* 5 sec */
static bool
is_fw_err_platform_config(struct intel_pxp *pxp, u32 type)
{
switch (type) {
case PXP_STATUS_ERROR_API_VERSION:
case PXP_STATUS_PLATFCONFIG_KF1_NOVERIF:
case PXP_STATUS_PLATFCONFIG_KF1_BAD:
pxp->platform_cfg_is_bad = true;
return true;
default:
break;
}
return false;
}
static const char *
fw_err_to_string(u32 type)
{
switch (type) {
case PXP_STATUS_ERROR_API_VERSION:
return "ERR_API_VERSION";
case PXP_STATUS_NOT_READY:
return "ERR_NOT_READY";
case PXP_STATUS_PLATFCONFIG_KF1_NOVERIF:
case PXP_STATUS_PLATFCONFIG_KF1_BAD:
return "ERR_PLATFORM_CONFIG";
default:
break;
}
return NULL;
}
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->ctrl_gt->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,
PXP_TRANSPORT_TIMEOUT_MS);
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,
PXP_TRANSPORT_TIMEOUT_MS);
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;
}
int intel_pxp_tee_stream_message(struct intel_pxp *pxp,
u8 client_id, u32 fence_id,
void *msg_in, size_t msg_in_len,
void *msg_out, size_t msg_out_len)
{
/* TODO: for bigger objects we need to use a sg of 4k pages */
const size_t max_msg_size = PAGE_SIZE;
struct drm_i915_private *i915 = pxp->ctrl_gt->i915;
struct i915_pxp_component *pxp_component = pxp->pxp_component;
unsigned int offset = 0;
struct scatterlist *sg;
int ret;
if (msg_in_len > max_msg_size || msg_out_len > max_msg_size)
return -ENOSPC;
mutex_lock(&pxp->tee_mutex);
if (unlikely(!pxp_component || !pxp_component->ops->gsc_command)) {
ret = -ENODEV;
goto unlock;
}
GEM_BUG_ON(!pxp->stream_cmd.obj);
sg = i915_gem_object_get_sg_dma(pxp->stream_cmd.obj, 0, &offset);
memcpy(pxp->stream_cmd.vaddr, msg_in, msg_in_len);
ret = pxp_component->ops->gsc_command(pxp_component->tee_dev, client_id,
fence_id, sg, msg_in_len, sg);
if (ret < 0)
drm_err(&i915->drm, "Failed to send PXP TEE gsc command\n");
else
memcpy(msg_out, pxp->stream_cmd.vaddr, msg_out_len);
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->pxp;
struct intel_gt *gt = pxp->ctrl_gt;
struct intel_uc *uc = >->uc;
intel_wakeref_t wakeref;
int ret = 0;
if (!HAS_HECI_PXP(i915)) {
pxp->dev_link = device_link_add(i915_kdev, tee_kdev, DL_FLAG_STATELESS);
if (drm_WARN_ON(&i915->drm, !pxp->dev_link))
return -ENODEV;
}
mutex_lock(&pxp->tee_mutex);
pxp->pxp_component = data;
pxp->pxp_component->tee_dev = tee_kdev;
mutex_unlock(&pxp->tee_mutex);
if (intel_uc_uses_huc(uc) && intel_huc_is_loaded_by_gsc(&uc->huc)) {
with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
/* load huc via pxp */
ret = intel_huc_fw_load_and_auth_via_gsc(&uc->huc);
if (ret < 0)
gt_probe_error(gt, "failed to load huc via gsc %d\n", ret);
}
}
/* 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 */
if (intel_pxp_is_enabled(pxp))
intel_pxp_init_hw(pxp);
intel_runtime_pm_put(&i915->runtime_pm, wakeref);
return ret;
}
static void i915_pxp_tee_component_unbind(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->pxp;
intel_wakeref_t wakeref;
if (intel_pxp_is_enabled(pxp))
with_intel_runtime_pm_if_in_use(&i915->runtime_pm, wakeref)
intel_pxp_fini_hw(pxp);
mutex_lock(&pxp->tee_mutex);
pxp->pxp_component = NULL;
mutex_unlock(&pxp->tee_mutex);
if (pxp->dev_link) {
device_link_del(pxp->dev_link);
pxp->dev_link = NULL;
}
}
static const struct component_ops i915_pxp_tee_component_ops = {
.bind = i915_pxp_tee_component_bind,
.unbind = i915_pxp_tee_component_unbind,
};
static int alloc_streaming_command(struct intel_pxp *pxp)
{
struct drm_i915_private *i915 = pxp->ctrl_gt->i915;
struct drm_i915_gem_object *obj = NULL;
void *cmd;
int err;
pxp->stream_cmd.obj = NULL;
pxp->stream_cmd.vaddr = NULL;
if (!IS_DGFX(i915))
return 0;
/* allocate lmem object of one page for PXP command memory and store it */
obj = i915_gem_object_create_lmem(i915, PAGE_SIZE, I915_BO_ALLOC_CONTIGUOUS);
if (IS_ERR(obj)) {
drm_err(&i915->drm, "Failed to allocate pxp streaming command!\n");
return PTR_ERR(obj);
}
err = i915_gem_object_pin_pages_unlocked(obj);
if (err) {
drm_err(&i915->drm, "Failed to pin gsc message page!\n");
goto out_put;
}
/* map the lmem into the virtual memory pointer */
cmd = i915_gem_object_pin_map_unlocked(obj,
intel_gt_coherent_map_type(pxp->ctrl_gt,
obj, true));
if (IS_ERR(cmd)) {
drm_err(&i915->drm, "Failed to map gsc message page!\n");
err = PTR_ERR(cmd);
goto out_unpin;
}
memset(cmd, 0, obj->base.size);
pxp->stream_cmd.obj = obj;
pxp->stream_cmd.vaddr = cmd;
return 0;
out_unpin:
i915_gem_object_unpin_pages(obj);
out_put:
i915_gem_object_put(obj);
return err;
}
static void free_streaming_command(struct intel_pxp *pxp)
{
struct drm_i915_gem_object *obj = fetch_and_zero(&pxp->stream_cmd.obj);
if (!obj)
return;
i915_gem_object_unpin_map(obj);
i915_gem_object_unpin_pages(obj);
i915_gem_object_put(obj);
}
int intel_pxp_tee_component_init(struct intel_pxp *pxp)
{
int ret;
struct intel_gt *gt = pxp->ctrl_gt;
struct drm_i915_private *i915 = gt->i915;
ret = alloc_streaming_command(pxp);
if (ret)
return ret;
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);
goto out_free;
}
pxp->pxp_component_added = true;
return 0;
out_free:
free_streaming_command(pxp);
return ret;
}
void intel_pxp_tee_component_fini(struct intel_pxp *pxp)
{
struct drm_i915_private *i915 = pxp->ctrl_gt->i915;
if (!pxp->pxp_component_added)
return;
component_del(i915->drm.dev, &i915_pxp_tee_component_ops);
pxp->pxp_component_added = false;
free_streaming_command(pxp);
}
int intel_pxp_tee_cmd_create_arb_session(struct intel_pxp *pxp,
int arb_session_id)
{
struct drm_i915_private *i915 = pxp->ctrl_gt->i915;
struct pxp42_create_arb_in msg_in = {};
struct pxp42_create_arb_out msg_out = {};
int ret;
msg_in.header.api_version = PXP_APIVER(4, 2);
msg_in.header.command_id = PXP42_CMDID_INIT_SESSION;
msg_in.header.buffer_len = sizeof(msg_in) - sizeof(msg_in.header);
msg_in.protection_mode = PXP42_ARB_SESSION_MODE_HEAVY;
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 init arb session, ret=[%d]\n", ret);
} else if (msg_out.header.status != 0) {
if (is_fw_err_platform_config(pxp, msg_out.header.status)) {
drm_info_once(&i915->drm,
"PXP init-arb-session-%d failed due to BIOS/SOC:0x%08x:%s\n",
arb_session_id, msg_out.header.status,
fw_err_to_string(msg_out.header.status));
} else {
drm_dbg(&i915->drm, "PXP init-arb-session--%d failed 0x%08x:%st:\n",
arb_session_id, msg_out.header.status,
fw_err_to_string(msg_out.header.status));
drm_dbg(&i915->drm, " cmd-detail: ID=[0x%08x],API-Ver-[0x%08x]\n",
msg_in.header.command_id, msg_in.header.api_version);
}
}
return ret;
}
void intel_pxp_tee_end_arb_fw_session(struct intel_pxp *pxp, u32 session_id)
{
struct drm_i915_private *i915 = pxp->ctrl_gt->i915;
struct pxp42_inv_stream_key_in msg_in = {};
struct pxp42_inv_stream_key_out msg_out = {};
int ret, trials = 0;
try_again:
memset(&msg_in, 0, sizeof(msg_in));
memset(&msg_out, 0, sizeof(msg_out));
msg_in.header.api_version = PXP_APIVER(4, 2);
msg_in.header.command_id = PXP42_CMDID_INVALIDATE_STREAM_KEY;
msg_in.header.buffer_len = sizeof(msg_in) - sizeof(msg_in.header);
msg_in.header.stream_id = FIELD_PREP(PXP_CMDHDR_EXTDATA_SESSION_VALID, 1);
msg_in.header.stream_id |= FIELD_PREP(PXP_CMDHDR_EXTDATA_APP_TYPE, 0);
msg_in.header.stream_id |= FIELD_PREP(PXP_CMDHDR_EXTDATA_SESSION_ID, session_id);
ret = intel_pxp_tee_io_message(pxp,
&msg_in, sizeof(msg_in),
&msg_out, sizeof(msg_out),
NULL);
/* Cleanup coherency between GT and Firmware is critical, so try again if it fails */
if ((ret || msg_out.header.status != 0x0) && ++trials < 3)
goto try_again;
if (ret) {
drm_err(&i915->drm, "Failed to send tee msg for inv-stream-key-%u, ret=[%d]\n",
session_id, ret);
} else if (msg_out.header.status != 0) {
if (is_fw_err_platform_config(pxp, msg_out.header.status)) {
drm_info_once(&i915->drm,
"PXP inv-stream-key-%u failed due to BIOS/SOC :0x%08x:%s\n",
session_id, msg_out.header.status,
fw_err_to_string(msg_out.header.status));
} else {
drm_dbg(&i915->drm, "PXP inv-stream-key-%u failed 0x%08x:%s:\n",
session_id, msg_out.header.status,
fw_err_to_string(msg_out.header.status));
drm_dbg(&i915->drm, " cmd-detail: ID=[0x%08x],API-Ver-[0x%08x]\n",
msg_in.header.command_id, msg_in.header.api_version);
}
}
}
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