[RFC-v21 06/13] drm/i915/pxp: Enable PXP irq worker and callback stub

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

rev21:
    - Fix bug, access i915 pointer before assigning the value at intel_pxp_irq_handler()
    - Writing register GEN11_CRYPTO_RSVD_INTR_ENABLE to enable the PXP irq
    - Remove the unnecessary comment for GEN11_CRYPTO_RSVD_INTR_MASK

Signed-off-by: Huang, Sean Z <sean.z.huang@xxxxxxxxx>
---
 drivers/gpu/drm/i915/gt/intel_gt_irq.c       | 14 +++
 drivers/gpu/drm/i915/i915_reg.h              |  1 +
 drivers/gpu/drm/i915/pxp/intel_pxp.c         | 99 ++++++++++++++++++++
 drivers/gpu/drm/i915/pxp/intel_pxp.h         | 23 ++++-
 drivers/gpu/drm/i915/pxp/intel_pxp_context.c |  3 +
 drivers/gpu/drm/i915/pxp/intel_pxp_context.h |  1 -
 drivers/gpu/drm/i915/pxp/intel_pxp_types.h   |  6 ++
 7 files changed, 145 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_irq.c b/drivers/gpu/drm/i915/gt/intel_gt_irq.c
index 9830342aa6f4..2241e9abfa3a 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_irq.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_irq.c
@@ -14,6 +14,7 @@
 #include "intel_lrc_reg.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)
 {
@@ -107,6 +108,9 @@ 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->pxp, iir);
+
 	WARN_ONCE(1, "unhandled other interrupt instance=0x%x, iir=0x%x\n",
 		  instance, iir);
 }
@@ -233,6 +237,9 @@ void gen11_gt_irq_reset(struct intel_gt *gt)
 	intel_uncore_write(uncore, GEN11_GPM_WGBOXPERF_INTR_MASK,  ~0);
 	intel_uncore_write(uncore, GEN11_GUC_SG_INTR_ENABLE, 0);
 	intel_uncore_write(uncore, GEN11_GUC_SG_INTR_MASK,  ~0);
+
+	intel_uncore_write(uncore, GEN11_CRYPTO_RSVD_INTR_ENABLE, 0);
+	intel_uncore_write(uncore, GEN11_CRYPTO_RSVD_INTR_MASK,  ~0);
 }
 
 void gen11_gt_irq_postinstall(struct intel_gt *gt)
@@ -245,6 +252,10 @@ void gen11_gt_irq_postinstall(struct intel_gt *gt)
 	struct intel_uncore *uncore = gt->uncore;
 	const u32 dmask = irqs << 16 | irqs;
 	const u32 smask = irqs << 16;
+	const u32 smask_pxp =
+		(PXP_IRQ_VECTOR_DISPLAY_PXP_STATE_TERMINATED |
+		 PXP_IRQ_VECTOR_DISPLAY_APP_TERM_PER_FW_REQ |
+		 PXP_IRQ_VECTOR_PXP_DISP_STATE_RESET_COMPLETE) << 16;
 
 	BUILD_BUG_ON(irqs & 0xffff0000);
 
@@ -271,6 +282,9 @@ void gen11_gt_irq_postinstall(struct intel_gt *gt)
 	/* Same thing for GuC interrupts */
 	intel_uncore_write(uncore, GEN11_GUC_SG_INTR_ENABLE, 0);
 	intel_uncore_write(uncore, GEN11_GUC_SG_INTR_MASK,  ~0);
+
+	intel_uncore_write(uncore, GEN11_CRYPTO_RSVD_INTR_ENABLE, smask_pxp);
+	intel_uncore_write(uncore, GEN11_CRYPTO_RSVD_INTR_MASK,  ~smask_pxp);
 }
 
 void gen5_gt_irq_handler(struct intel_gt *gt, u32 gt_iir)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 249a81575b9d..97bcecada87f 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 f71677a84405..99cd93e12455 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c
@@ -2,6 +2,7 @@
 /*
  * Copyright(c) 2020 Intel Corporation.
  */
+#include <linux/workqueue.h>
 #include "i915_drv.h"
 #include "intel_pxp.h"
 #include "intel_pxp_context.h"
@@ -14,6 +15,70 @@
 /* Setting KCR Init bit is required after system boot */
 #define KCR_INIT_ALLOW_DISPLAY_ME_WRITES (BIT(14) | (BIT(14) << 16))
 
+static void intel_pxp_write_irq_mask_reg(struct intel_gt *gt, u32 mask)
+{
+	lockdep_assert_held(&gt->irq_lock);
+
+	intel_uncore_write(gt->uncore, GEN11_CRYPTO_RSVD_INTR_MASK, mask << 16);
+}
+
+static int intel_pxp_teardown_required_callback(struct intel_pxp *pxp)
+{
+	int ret;
+
+	mutex_lock(&pxp->ctx.mutex);
+
+	pxp->ctx.global_state_attacked = true;
+
+	mutex_unlock(&pxp->ctx.mutex);
+
+	return ret;
+}
+
+static int intel_pxp_global_terminate_complete_callback(struct intel_pxp *pxp)
+{
+	int ret = 0;
+	struct intel_gt *gt = container_of(pxp, typeof(*gt), pxp);
+
+	mutex_lock(&pxp->ctx.mutex);
+
+	if (pxp->ctx.global_state_attacked) {
+		pxp->ctx.global_state_attacked = false;
+
+		/* Re-create the arb session after teardown handle complete */
+		ret = intel_pxp_arb_create_session(pxp);
+		if (ret) {
+			drm_err(&gt->i915->drm, "Failed to create arb session\n");
+			goto end;
+		}
+	}
+end:
+	mutex_unlock(&pxp->ctx.mutex);
+	return ret;
+}
+
+static void intel_pxp_irq_work(struct work_struct *work)
+{
+	struct intel_pxp *pxp = container_of(work, typeof(*pxp), irq_work);
+	struct intel_gt *gt = container_of(pxp, typeof(*gt), pxp);
+	u32 events = 0;
+
+	spin_lock_irq(&gt->irq_lock);
+	events = fetch_and_zero(&pxp->current_events);
+	spin_unlock_irq(&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(pxp);
+
+	if (events & PXP_IRQ_VECTOR_PXP_DISP_STATE_RESET_COMPLETE)
+		intel_pxp_global_terminate_complete_callback(pxp);
+
+	spin_lock_irq(&gt->irq_lock);
+	intel_pxp_write_irq_mask_reg(gt, ~pxp->handled_irr);
+	spin_unlock_irq(&gt->irq_lock);
+}
+
 void intel_pxp_init(struct intel_pxp *pxp)
 {
 	struct intel_gt *gt = container_of(pxp, struct intel_gt, pxp);
@@ -41,6 +106,12 @@ void intel_pxp_init(struct intel_pxp *pxp)
 
 	intel_pxp_tee_component_init(pxp);
 
+	INIT_WORK(&pxp->irq_work, intel_pxp_irq_work);
+
+	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);
+
 	drm_info(&gt->i915->drm, "Protected Xe Path (PXP) protected content support initialized\n");
 }
 
@@ -55,3 +126,31 @@ void intel_pxp_fini(struct intel_pxp *pxp)
 
 	intel_pxp_ctx_fini(&pxp->ctx);
 }
+
+/**
+ * intel_pxp_irq_handler - Proxies KCR interrupts to PXP.
+ * @pxp: pointer to pxp struct
+ * @iir: GT interrupt vector associated with the interrupt
+ *
+ * Dispatches each vector element into an IRQ to PXP.
+ */
+void intel_pxp_irq_handler(struct intel_pxp *pxp, u16 iir)
+{
+	const u32 events = iir & pxp->handled_irr;
+	struct intel_gt *gt = container_of(pxp, typeof(*gt), pxp);
+
+	if (!gt || !gt->i915 || INTEL_GEN(gt->i915) < 12)
+		return;
+
+	lockdep_assert_held(&gt->irq_lock);
+
+	if (!events) {
+		drm_err(&gt->i915->drm, "pxp irq handler called with zero irr\n");
+		return;
+	}
+
+	intel_pxp_write_irq_mask_reg(gt, ~0);
+
+	pxp->current_events |= events;
+	schedule_work(&pxp->irq_work);
+}
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.h b/drivers/gpu/drm/i915/pxp/intel_pxp.h
index f47bc6bea34f..420da2790624 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.h
@@ -8,15 +8,36 @@
 
 #include "intel_pxp_types.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)
+
 #ifdef CONFIG_DRM_I915_PXP
+void intel_pxp_irq_handler(struct intel_pxp *pxp, u16 iir);
+int i915_pxp_teardown_required_callback(struct intel_pxp *pxp);
+int i915_pxp_global_terminate_complete_callback(struct intel_pxp *pxp);
+
 void intel_pxp_init(struct intel_pxp *pxp);
 void intel_pxp_fini(struct intel_pxp *pxp);
 #else
-static inline void intel_pxp_init(struct intel_pxp *pxp)
+static inline void intel_pxp_irq_handler(struct intel_pxp *pxp, u16 iir)
+{
+}
+
+static inline int i915_pxp_teardown_required_callback(struct intel_pxp *pxp)
+{
+	return 0;
+}
+
+static inline int i915_pxp_global_terminate_complete_callback(struct intel_pxp *pxp)
 {
 	return 0;
 }
 
+static inline void intel_pxp_init(struct intel_pxp *pxp)
+{
+}
+
 static inline void intel_pxp_fini(struct intel_pxp *pxp)
 {
 }
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_context.c b/drivers/gpu/drm/i915/pxp/intel_pxp_context.c
index 2be6bf2f0d0f..4e820258b7ae 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_context.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_context.c
@@ -11,7 +11,10 @@
  */
 void intel_pxp_ctx_init(struct pxp_context *ctx)
 {
+	ctx->global_state_attacked = false;
+
 	mutex_init(&ctx->mutex);
+
 	ctx->inited = true;
 }
 
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_context.h b/drivers/gpu/drm/i915/pxp/intel_pxp_context.h
index bf2feb4aaf6d..f51021c33d45 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_context.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_context.h
@@ -8,7 +8,6 @@
 
 #include <linux/mutex.h>
 #include "intel_pxp_types.h"
-#include "intel_pxp_arb.h"
 
 void intel_pxp_ctx_init(struct pxp_context *ctx);
 void intel_pxp_ctx_fini(struct pxp_context *ctx);
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_types.h b/drivers/gpu/drm/i915/pxp/intel_pxp_types.h
index 19d43b43e483..dd7445ff2cb8 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_types.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_types.h
@@ -7,6 +7,7 @@
 #define __INTEL_PXP_TYPES_H__
 
 #include <linux/mutex.h>
+#include <linux/workqueue.h>
 
 struct intel_engine_cs;
 
@@ -20,9 +21,14 @@ struct pxp_context {
 	bool arb_is_in_play;
 
 	bool flag_display_hm_surface_keys;
+	bool global_state_attacked;
 };
 
 struct intel_pxp {
+	struct work_struct irq_work;
+	u32 handled_irr;
+	u32 current_events;
+
 	struct pxp_context ctx;
 
 	struct intel_engine_cs *vcs_engine;
-- 
2.17.1

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