#include "gt/intel_context.h"
#include "i915_drv.h"
+/**
+ * DOC: PXP
+ *
+ * PXP (Protected Xe Path) is a feature available in Gen12 and newer platforms.
+ * It allows execution and flip to display of protected (i.e. encrypted)
+ * objects. The SW support is enabled via the CONFIG_DRM_I915_PXP kconfig.
+ *
+ * Objects can opt-in to PXP encryption at creation time via the
+ * I915_GEM_CREATE_EXT_PROTECTED_CONTENT create_ext flag. For objects to be
+ * correctly protected they must be used in conjunction with a context created
+ * with the I915_CONTEXT_PARAM_PROTECTED_CONTENT flag. See the documentation
+ * of those two uapi flags for details and restrictions.
+ *
+ * Protected objects are tied to a pxp session; currently we only support one
+ * session, which i915 manages and whose index is available in the uapi
+ * (I915_PROTECTED_CONTENT_DEFAULT_SESSION) for use in instructions targeting
+ * protected objects.
+ * The session is invalidated by the HW when certain events occur (e.g.
+ * suspend/resume). When this happens, all the objects that were used with the
+ * session are marked as invalid and all contexts marked as using protected
+ * content are banned. Any further attempt at using them in an execbuf call is
+ * rejected, while flips are converted to black frames.
+ *
+ * Some of the PXP setup operations are performed by the Management Engine,
+ * which is handled by the mei driver; communication between i915 and mei is
+ * performed via the mei_pxp component module.
+ */
+
struct intel_gt *pxp_to_gt(const struct intel_pxp *pxp)
{
return container_of(pxp, struct intel_gt, pxp);
struct intel_context;
struct i915_pxp_component;
+/**
+ * struct intel_pxp - pxp state
+ */
struct intel_pxp {
+ /**
+ * @pxp_component: i915_pxp_component struct of the bound mei_pxp
+ * module. Only set and cleared inside component bind/unbind functions,
+ * which are protected by &tee_mutex.
+ */
struct i915_pxp_component *pxp_component;
+ /**
+ * @pxp_component_added: track if the pxp component has been added.
+ * Set and cleared in tee init and fini functions respectively.
+ */
bool pxp_component_added;
+ /** @ce: kernel-owned context used for PXP operations */
struct intel_context *ce;
- /*
+ /** @arb_mutex: protects arb session start */
+ struct mutex arb_mutex;
+ /**
+ * @arb_is_valid: tracks arb session status.
* After a teardown, the arb session can still be in play on the HW
* even if the keys are gone, so we can't rely on the HW state of the
* session to know if it's valid and need to track the status in SW.
*/
- struct mutex arb_mutex; /* protects arb session start */
bool arb_is_valid;
- /*
- * Keep track of which key instance we're on, so we can use it to
- * determine if an object was created using the current key or a
+ /**
+ * @key_instance: tracks which key instance we're on, so we can use it
+ * to determine if an object was created using the current key or a
* previous one.
*/
u32 key_instance;
- struct mutex tee_mutex; /* protects the tee channel binding */
+ /** @tee_mutex: protects the tee channel binding and messaging. */
+ struct mutex tee_mutex;
- /*
- * If the HW perceives an attack on the integrity of the encryption it
- * will invalidate the keys and expect SW to re-initialize the session.
- * We keep track of this state to make sure we only re-start the arb
- * session when required.
+ /**
+ * @hw_state_invalidated: if the HW perceives an attack on the integrity
+ * of the encryption it will invalidate the keys and expect SW to
+ * re-initialize the session. We keep track of this state to make sure
+ * we only re-start the arb session when required.
*/
bool hw_state_invalidated;
+ /** @irq_enabled: tracks the status of the kcr irqs */
bool irq_enabled;
+ /**
+ * @termination: tracks the status of a pending termination. Only
+ * re-initialized under gt->irq_lock and completed in &session_work.
+ */
struct completion termination;
+ /** @session_work: worker that manages session events. */
struct work_struct session_work;
- u32 session_events; /* protected with gt->irq_lock */
+ /** @session_events: pending session events, protected with gt->irq_lock. */
+ u32 session_events;
#define PXP_TERMINATION_REQUEST BIT(0)
#define PXP_TERMINATION_COMPLETE BIT(1)
#define PXP_INVAL_REQUIRED BIT(2)
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