[Intel-gfx] [RFC-v1 02/16] drm/i915/pxp: Enable PXP irq worker and callback stub

["Huang, Sean Z" <sean.z.huang@intel.com>]

Create the irq worker that serves as callback handler, those
callback stubs should be called while the hardware key teardown
occurs.

Signed-off-by: Huang, Sean Z <sean.z.huang@intel.com>
---
 drivers/gpu/drm/i915/gt/intel_gt_irq.c |  4 ++
 drivers/gpu/drm/i915/i915_reg.h        |  1 +
 drivers/gpu/drm/i915/pxp/intel_pxp.c   | 88 ++++++++++++++++++++++++++
 drivers/gpu/drm/i915/pxp/intel_pxp.h   | 36 +++++++++++
 4 files changed, 129 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_irq.c b/drivers/gpu/drm/i915/gt/intel_gt_irq.c
index 257063a57101..d64013d0afb5 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_irq.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_irq.c
@@ -13,6 +13,7 @@
 #include "intel_gt_irq.h"
 #include "intel_uncore.h"
 #include "intel_rps.h"
+#include "pxp/intel_pxp.h"
 
 static void guc_irq_handler(struct intel_guc *guc, u16 iir)
 {
@@ -106,6 +107,9 @@ gen11_other_irq_handler(struct intel_gt *gt, const u8 instance,
 	if (instance == OTHER_GTPM_INSTANCE)
 		return gen11_rps_irq_handler(&gt->rps, iir);
 
+	if (instance == OTHER_KCR_INSTANCE)
+		return intel_pxp_irq_handler(gt, iir);
+
 	WARN_ONCE(1, "unhandled other interrupt instance=0x%x, iir=0x%x\n",
 		  instance, iir);
 }
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 5375b219cc3b..c3b9ca142539 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7943,6 +7943,7 @@ enum {
 /* irq instances for OTHER_CLASS */
 #define OTHER_GUC_INSTANCE	0
 #define OTHER_GTPM_INSTANCE	1
+#define OTHER_KCR_INSTANCE	4
 
 #define GEN11_INTR_IDENTITY_REG(x)	_MMIO(0x190060 + ((x) * 4))
 
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.c b/drivers/gpu/drm/i915/pxp/intel_pxp.c
index 3de4593ca495..07faaadb0031 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c
@@ -6,6 +6,58 @@
 #include "i915_drv.h"
 #include "intel_pxp.h"
 
+static void intel_pxp_write_irq_mask_reg(struct drm_i915_private *i915, u32 mask)
+{
+	/* crypto mask is in bit31-16 (Engine1 Interrupt Mask) */
+	intel_uncore_write(&i915->uncore, GEN11_CRYPTO_RSVD_INTR_MASK, mask << 16);
+}
+
+static void intel_pxp_unmask_irq(struct intel_gt *gt)
+{
+	lockdep_assert_held(&gt->irq_lock);
+
+	intel_pxp_write_irq_mask_reg(gt->i915, 0);
+}
+
+static void intel_pxp_mask_irq(struct intel_gt *gt, u32 mask)
+{
+	lockdep_assert_held(&gt->irq_lock);
+
+	intel_pxp_write_irq_mask_reg(gt->i915, mask);
+}
+
+static int intel_pxp_teardown_required_callback(struct drm_i915_private *i915)
+{
+	return 0;
+}
+
+static int intel_pxp_global_terminate_complete_callback(struct drm_i915_private *i915)
+{
+	return 0;
+}
+
+static void intel_pxp_irq_work(struct work_struct *work)
+{
+	struct intel_pxp *pxp_ptr = container_of(work, typeof(*pxp_ptr), irq_work);
+	struct drm_i915_private *i915 = container_of(pxp_ptr, typeof(*i915), pxp);
+	u32 events = 0;
+
+	spin_lock_irq(&i915->gt.irq_lock);
+	events = fetch_and_zero(&pxp_ptr->current_events);
+	spin_unlock_irq(&i915->gt.irq_lock);
+
+	if (events & PXP_IRQ_VECTOR_DISPLAY_PXP_STATE_TERMINATED ||
+	    events & PXP_IRQ_VECTOR_DISPLAY_APP_TERM_PER_FW_REQ)
+		intel_pxp_teardown_required_callback(i915);
+
+	if (events & PXP_IRQ_VECTOR_PXP_DISP_STATE_RESET_COMPLETE)
+		intel_pxp_global_terminate_complete_callback(i915);
+
+	spin_lock_irq(&i915->gt.irq_lock);
+	intel_pxp_unmask_irq(&i915->gt);
+	spin_unlock_irq(&i915->gt.irq_lock);
+}
+
 int intel_pxp_init(struct drm_i915_private *i915)
 {
 	if (!i915)
@@ -17,9 +69,45 @@ int intel_pxp_init(struct drm_i915_private *i915)
 
 	drm_info(&i915->drm, "i915 PXP is inited with i915=[%p]\n", i915);
 
+	INIT_WORK(&i915->pxp.irq_work, intel_pxp_irq_work);
+
+	i915->pxp.handled_irr = (PXP_IRQ_VECTOR_DISPLAY_PXP_STATE_TERMINATED |
+				 PXP_IRQ_VECTOR_DISPLAY_APP_TERM_PER_FW_REQ |
+				 PXP_IRQ_VECTOR_PXP_DISP_STATE_RESET_COMPLETE);
+
 	return 0;
 }
 
 void intel_pxp_uninit(struct drm_i915_private *i915)
 {
 }
+
+/**
+ * intel_pxp_irq_handler - Proxies KCR interrupts to PXP.
+ * @gt: valid GT instance
+ * @iir: GT interrupt vector associated with the interrupt
+ *
+ * Dispatches each vector element into an IRQ to PXP.
+ */
+void intel_pxp_irq_handler(struct intel_gt *gt, u16 iir)
+{
+	struct drm_i915_private *i915;
+	const u32 events = iir & i915->pxp.handled_irr;
+
+	if (!gt || !gt->i915 || INTEL_GEN(i915) < 12)
+		return;
+
+	i915 = gt->i915;
+
+	lockdep_assert_held(&gt->irq_lock);
+
+	if (unlikely(!events)) {
+		drm_err(&i915->drm, "%s returned due to iir=[0x%04x]\n", __func__, iir);
+		return;
+	}
+
+	intel_pxp_mask_irq(gt, i915->pxp.handled_irr);
+
+	i915->pxp.current_events |= events;
+	schedule_work(&i915->pxp.irq_work);
+}
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.h b/drivers/gpu/drm/i915/pxp/intel_pxp.h
index 0b83d33045f3..7966dc275b54 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.h
@@ -8,18 +8,54 @@
 
 #include <drm/drm_file.h>
 
+#define PXP_IRQ_VECTOR_DISPLAY_PXP_STATE_TERMINATED BIT(1)
+#define PXP_IRQ_VECTOR_DISPLAY_APP_TERM_PER_FW_REQ BIT(2)
+#define PXP_IRQ_VECTOR_PXP_DISP_STATE_RESET_COMPLETE BIT(3)
+
+enum pxp_sm_session_req {
+	/* Request KMD to allocate session id and move it to IN INIT */
+	PXP_SM_REQ_SESSION_ID_INIT = 0x0,
+	/* Inform KMD that UMD has completed the initialization */
+	PXP_SM_REQ_SESSION_IN_PLAY,
+	/* Request KMD to terminate the session */
+	PXP_SM_REQ_SESSION_TERMINATE
+};
+
 struct pxp_context;
 
 struct intel_pxp {
+	struct work_struct irq_work;
+	u32 handled_irr;
+	u32 current_events;
+
 	struct pxp_context *ctx;
 };
 
+struct intel_gt;
 struct drm_i915_private;
 
 #ifdef CONFIG_DRM_I915_PXP
+void intel_pxp_irq_handler(struct intel_gt *gt, u16 iir);
+int i915_pxp_teardown_required_callback(struct drm_i915_private *i915);
+int i915_pxp_global_terminate_complete_callback(struct drm_i915_private *i915);
+
 int intel_pxp_init(struct drm_i915_private *i915);
 void intel_pxp_uninit(struct drm_i915_private *i915);
 #else
+static inline void intel_pxp_irq_handler(struct intel_gt *gt, u16 iir)
+{
+}
+
+static inline int i915_pxp_teardown_required_callback(struct drm_i915_private *i915)
+{
+	return 0;
+}
+
+static inline int i915_pxp_global_terminate_complete_callback(struct drm_i915_private *i915)
+{
+	return 0;
+}
+
 static inline int intel_pxp_init(struct drm_i915_private *i915)
 {
 	return 0;
-- 
2.17.1

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