With this ioctl action, user space driver can reserve a specific
session slot/id assigned by PXP, as the first step of PXP session
establishment flow. The session info is stored in the session list
structure.
Signed-off-by: Huang, Sean Z <sean.z.huang@xxxxxxxxx>
---
drivers/gpu/drm/i915/pxp/intel_pxp.c | 20 ++++
drivers/gpu/drm/i915/pxp/intel_pxp.h | 24 +++-
drivers/gpu/drm/i915/pxp/intel_pxp_sm.c | 149 +++++++++++++++++++++++-
drivers/gpu/drm/i915/pxp/intel_pxp_sm.h | 3 +
4 files changed, 193 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.c b/drivers/gpu/drm/i915/pxp/intel_pxp.c
index 34f6db3f8bd6..5f13a44fe548 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c
@@ -38,6 +38,26 @@ int i915_pxp_ops_ioctl(struct drm_device *dev, void *data, struct drm_file *drmf
}
switch (pxp_info.action) {
+ case PXP_ACTION_SET_SESSION_STATUS:
+ {
+ struct pxp_sm_set_session_status_params *params = &pxp_info.set_session_status;
+
+ if (params->req_session_state == PXP_SM_REQ_SESSION_ID_INIT) {
+ ret = intel_pxp_sm_reserve_session(i915, drmfile, 0,
+ params->session_type,
+ params->session_mode,
+ ¶ms->pxp_tag);
+ if (ret == PXP_SM_STATUS_RETRY_REQUIRED ||
+ ret == PXP_SM_STATUS_SESSION_NOT_AVAILABLE) {
+ pxp_info.sm_status = ret;
+ ret = 0;
+ }
+ } else {
+ ret = -EINVAL;
+ goto end;
+ }
+ break;
+ }
case PXP_ACTION_SET_USER_CONTEXT:
{
ret = intel_pxp_set_user_ctx(i915, pxp_info.set_user_ctx);
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.h b/drivers/gpu/drm/i915/pxp/intel_pxp.h
index c9d19d3ee0e7..1ed433b04943 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.h
@@ -15,6 +15,9 @@
#define pxp_session_list(i915, session_type) (((session_type) == SESSION_TYPE_TYPE0) ? \
&(i915)->pxp.ctx->active_pxp_type0_sessions : &(i915)->pxp.ctx->active_pxp_type1_sessions)
+#define pxp_session_max(session_type) (((session_type) == SESSION_TYPE_TYPE0) ? \
+ MAX_TYPE0_SESSIONS : MAX_TYPE1_SESSIONS)
+
#define MAX_TYPE0_SESSIONS 16
#define MAX_TYPE1_SESSIONS 6
@@ -27,7 +30,10 @@ enum pxp_sm_session_req {
PXP_SM_REQ_SESSION_TERMINATE
};
-#define PXP_ACTION_SET_USER_CONTEXT 5
+enum pxp_ioctl_action {
+ PXP_ACTION_SET_SESSION_STATUS = 1,
+ PXP_ACTION_SET_USER_CONTEXT = 5,
+};
enum pxp_sm_status {
PXP_SM_STATUS_SUCCESS,
@@ -36,10 +42,24 @@ enum pxp_sm_status {
PXP_SM_STATUS_ERROR_UNKNOWN
};
+struct pxp_sm_set_session_status_params {
+ /** @pxp_tag: in [optional], for Arbitrator session, out pxp tag */
+ u32 pxp_tag;
+ /** @session_type: in, session type */
+ u32 session_type;
+ /** @session_mode: in, session mode */
+ u32 session_mode;
+ /** @req_session_state: in, new session state */
+ u32 req_session_state;
+};
+
struct pxp_info {
u32 action;
u32 sm_status;
- u32 set_user_ctx;
+ union {
+ struct pxp_sm_set_session_status_params set_session_status;
+ u32 set_user_ctx;
+ };
} __attribute__((packed));
struct drm_i915_pxp_ops {
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c
index 469810390c9b..e4218083f7ec 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c
@@ -145,7 +145,7 @@ static int pxp_set_pxp_tag(struct drm_i915_private *i915, int session_type,
}
pxp_tag->session_id = pxp_get_session_id(session_idx, session_type);
-end:
+
return 0;
}
@@ -298,6 +298,153 @@ static bool check_if_protected_type0_sessions_are_attacked(struct drm_i915_priva
return false;
}
+/**
+ * create_new_session_entry - Create a new session entry with provided info.
+ * @i915: i915 device handle.
+ * @drmfile: pointer to drm_file
+ * @context_id: Numeric identifier of the context created by the caller.
+ * @session_type: Type of the session requested. One of enum pxp_session_types.
+ * @protection_mode: Type of protection requested for the session.
+ * One of the enum pxp_protection_modes.
+ * @session_index: Numeric session identifier.
+ *
+ * Return: status. 0 means creation is successful.
+ */
+static int create_new_session_entry(struct drm_i915_private *i915, struct drm_file *drmfile,
+ int context_id, int session_type, int protection_mode,
+ int session_index)
+{
+ struct pxp_protected_session *new_session = NULL;
+ int pid = 0;
+
+ if (drmfile)
+ pid = pid_nr(drmfile->pid);
+
+ new_session = kzalloc(sizeof(*new_session), GFP_KERNEL);
+ if (!new_session)
+ return -ENOMEM;
+
+ new_session->context_id = context_id;
+ new_session->session_type = session_type;
+ new_session->protection_mode = protection_mode;
+ new_session->session_index = session_index;
+ new_session->session_is_in_play = false;
+ new_session->drmfile = drmfile;
+ new_session->pid = pid;
+
+ switch (session_type) {
+ case SESSION_TYPE_TYPE0:
+ /* check to make sure the session id is within allowed range */
+ if (session_index < 0 || session_index >= MAX_TYPE0_SESSIONS) {
+ /* session id out of range.. free the new entry and return error */
+ kfree(new_session);
+ drm_err(&i915->drm, "Failed to %s, bad params\n", __func__);
+ return -EINVAL;
+ }
+
+ list_add(&new_session->session_list, &i915->pxp.ctx->active_pxp_type0_sessions);
+ break;
+
+ case SESSION_TYPE_TYPE1:
+ /* check to make sure the session id is within allowed range */
+ if (session_index < 0 || session_index >= MAX_TYPE1_SESSIONS) {
+ /* session id out of range.. free the new entry and return error */
+ kfree(new_session);
+ drm_err(&i915->drm, "Failed to %s, bad params\n", __func__);
+ return -EINVAL;
+ }
+
+ list_add(&new_session->session_list, &i915->pxp.ctx->active_pxp_type1_sessions);
+ break;
+
+ default:
+ /* session type is invalid... free new entry and return error. */
+ kfree(new_session);
+ drm_err(&i915->drm, "Failed to %s, bad params\n", __func__);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/**
+ * intel_pxp_sm_reserve_session - To reserve an available protected session.
+ * @i915: i915 device handle.
+ * @drmfile: pointer to drm_file.
+ * @context_id: Numeric identifier of the context created by the caller.
+ * @session_type: Type of the session requested. One of enum pxp_session_types.
+ * @protection_mode: Type of protection requested for the session. One of the
+ * enum pxp_protection_modes.
+ * @pxp_tag: Numeric session identifier returned back to caller.
+ *
+ * Return: status. 0 means reserve is successful.
+ */
+int intel_pxp_sm_reserve_session(struct drm_i915_private *i915, struct drm_file *drmfile,
+ int context_id, int session_type, int protection_mode,
+ u32 *pxp_tag)
+{
+ int ret;
+ int session_index = 0;
+
+ if (!pxp_tag || !i915)
+ return -EINVAL;
+
+ if (protection_mode != PROTECTION_MODE_LM && protection_mode != PROTECTION_MODE_HM &&
+ protection_mode != PROTECTION_MODE_SM) {
+ drm_err(&i915->drm, "Failed to %s, invalid session mode=[%d]\n",
+ __func__, protection_mode);
+ return -EINVAL;
+ }
+
+ lockdep_assert_held(&i915->pxp.ctx->ctx_mutex);
+
+ if (session_type == SESSION_TYPE_TYPE0) {
+ /*
+ * check if sessions are under attack. if so, don't allow creation of
+ * new session entries
+ */
+ if (check_if_protected_type0_sessions_are_attacked(i915))
+ /* protected sessions are under attack. return failure. */
+ return -EPERM;
+ }
+
+ /*
+ * iterate over the active sessions list to find next available open session id
+ * Cannot assume that the session entries will be sorted in the linked list
+ * as terminates are allowed at any time without re-sorting the linked list.
+ * So, the linked list should be walked start to finish to ensure a session is
+ * not already active
+ */
+ for (session_index = 0; session_index < pxp_session_max(session_type); session_index++) {
+ if (!is_sw_session_active(i915, session_type, session_index, false, NULL)) {
+ ret = sync_hw_sw_state(i915, session_index, session_type);
+ if (unlikely(ret)) {
+ ret = PXP_SM_STATUS_RETRY_REQUIRED;
+ goto end;
+ }
+
+ /*
+ * found an available session... create a new session entry
+ * with this identifier and return success
+ */
+ ret = create_new_session_entry(i915, drmfile, context_id, session_type,
+ protection_mode, session_index);
+ if (unlikely(ret))
+ goto end;
+
+ ret = pxp_set_pxp_tag(i915, session_type, session_index, protection_mode);
+ goto end;
+ }
+ }
+
+ ret = PXP_SM_STATUS_SESSION_NOT_AVAILABLE;
+end:
+ if (ret == 0)
+ *pxp_tag = intel_pxp_get_pxp_tag(i915, session_index, session_type, NULL);
+
+ return ret;
+}
+
int pxp_sm_set_kcr_init_reg(struct drm_i915_private *i915)
{
int ret;
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h
index b5012948f971..5fcf63f804f8 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h
@@ -84,6 +84,9 @@ struct pxp_protected_session {
bool session_is_in_play;
};
+int intel_pxp_sm_reserve_session(struct drm_i915_private *i915, struct drm_file *drmfile,
+ int context_id, int session_type, int protection_mode,
+ u32 *pxp_tag);
int pxp_sm_set_kcr_init_reg(struct drm_i915_private *i915);
#endif /* __INTEL_PXP_SM_H__ */
--
2.17.1
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