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@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_gt_irq.c | 4 +
drivers/gpu/drm/i915/i915_reg.h | 3 +-
drivers/gpu/drm/i915/pxp/intel_pxp.c | 101 +++++++++++++++++++
drivers/gpu/drm/i915/pxp/intel_pxp.h | 27 +++++
drivers/gpu/drm/i915/pxp/intel_pxp_context.c | 2 +
drivers/gpu/drm/i915/pxp/intel_pxp_context.h | 1 +
6 files changed, 137 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_irq.c b/drivers/gpu/drm/i915/gt/intel_gt_irq.c
index 257063a57101..fbe9ef88b905 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(>->rps, iir);
+ if (instance == OTHER_KCR_INSTANCE)
+ return intel_pxp_irq_handler(>->pxp, 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 0023c023f472..1e8dfe435ca8 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7944,6 +7944,7 @@ 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))
@@ -7966,7 +7967,7 @@ enum {
#define GEN11_VECS0_VECS1_INTR_MASK _MMIO(0x1900d0)
#define GEN11_GUC_SG_INTR_MASK _MMIO(0x1900e8)
#define GEN11_GPM_WGBOXPERF_INTR_MASK _MMIO(0x1900ec)
-#define GEN11_CRYPTO_RSVD_INTR_MASK _MMIO(0x1900f0)
+#define GEN11_CRYPTO_INTR_MASK _MMIO(0x1900f0) /* crypto mask is in bit31-16 (Engine1 Interrupt Mask) */
#define GEN11_GUNIT_CSME_INTR_MASK _MMIO(0x1900f4)
#define ENGINE1_MASK REG_GENMASK(31, 16)
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.c b/drivers/gpu/drm/i915/pxp/intel_pxp.c
index 67bdaeb79b40..9bcb170b34f1 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c
@@ -14,6 +14,70 @@
/* Setting KCR Init bit is required after system boot */
#define KCR_INIT_ALLOW_DISPLAY_ME_WRITES (BIT(14) | (BIT(14) << KCR_INIT_MASK_SHIFT))
+static void intel_pxp_write_irq_mask_reg(struct intel_gt *gt, u32 mask)
+{
+ lockdep_assert_held(>->irq_lock);
+
+ intel_uncore_write(gt->uncore, GEN11_CRYPTO_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(>->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(>->irq_lock);
+ events = fetch_and_zero(&pxp->current_events);
+ spin_unlock_irq(>->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(>->irq_lock);
+ intel_pxp_write_irq_mask_reg(gt, 0);
+ spin_unlock_irq(>->irq_lock);
+}
+
int intel_pxp_init(struct intel_pxp *pxp)
{
struct intel_gt *gt = container_of(pxp, struct intel_gt, pxp);
@@ -28,6 +92,12 @@ int 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(>->i915->drm, "Protected Xe Path (PXP) protected content support initialized\n");
return 0;
@@ -39,3 +109,34 @@ void intel_pxp_uninit(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)
+{
+ struct drm_i915_private *i915;
+ const u32 events = iir & pxp->handled_irr;
+ struct intel_gt *gt = container_of(pxp, typeof(*gt), pxp);
+
+ if (!gt || !gt->i915 || INTEL_GEN(i915) < 12)
+ return;
+
+ i915 = gt->i915;
+
+ lockdep_assert_held(>->irq_lock);
+
+ if (unlikely(!events)) {
+ drm_err(&i915->drm, "%s returned due to iir=[0x%04x]\n", __func__, iir);
+ return;
+ }
+
+ intel_pxp_write_irq_mask_reg(gt, pxp->handled_irr);
+
+ 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 406d35f402a6..c8c580cee5bc 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.h
@@ -6,8 +6,13 @@
#ifndef __INTEL_PXP_H__
#define __INTEL_PXP_H__
+#include <linux/workqueue.h>
#include "intel_pxp_context.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_session_types {
SESSION_TYPE_TYPE0 = 0,
SESSION_TYPE_TYPE1 = 1,
@@ -25,14 +30,36 @@ enum pxp_protection_modes {
};
struct intel_pxp {
+ struct work_struct irq_work;
+ u32 handled_irr;
+ u32 current_events;
+
struct pxp_context ctx;
};
#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);
+
int intel_pxp_init(struct intel_pxp *pxp);
void intel_pxp_uninit(struct intel_pxp *pxp);
int intel_pxp_reg_read(struct intel_pxp *pxp, u32 offset, u32 *regval);
#else
+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 int intel_pxp_init(struct intel_pxp *pxp)
{
return 0;
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_context.c b/drivers/gpu/drm/i915/pxp/intel_pxp_context.c
index 5ffaf55dc7df..d00f4e0b88ba 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_context.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_context.c
@@ -14,6 +14,8 @@ void intel_pxp_ctx_init(struct pxp_context *ctx)
{
get_random_bytes(&ctx->id, sizeof(ctx->id));
+ ctx->global_state_attacked = false;
+
mutex_init(&ctx->mutex);
}
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_context.h b/drivers/gpu/drm/i915/pxp/intel_pxp_context.h
index e37125ed7434..62a2504b33bf 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_context.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_context.h
@@ -18,6 +18,7 @@ struct pxp_context {
int id;
+ bool global_state_attacked;
bool flag_display_hm_surface_keys;
};
--
2.17.1
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