Re: [Intel-gfx] [PXP CLEAN PATCH v06 02/27] drm/i915/pxp: Enable PXP irq worker and callback stub

["Souza, Jose" <jose.souza@intel.com>]

On Fri, 2020-11-13 at 16:36 -0800, Sean Z Huang wrote:
> From: "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   | 95 ++++++++++++++++++++++++++
>  drivers/gpu/drm/i915/pxp/intel_pxp.h   | 22 ++++++
>  4 files changed, 122 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 7ea70b7ffcc6..faf6b06145fa 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -7941,6 +7941,7 @@ 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 a469c55e3e54..d98bff4a0fde 100644
> --- a/drivers/gpu/drm/i915/pxp/intel_pxp.c
> +++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c
> @@ -6,15 +6,110 @@
>  #include "i915_drv.h"
>  #include "intel_pxp.h"
>  
> 
> 
> 
> +static void intel_pxp_write_irq_mask_reg(struct drm_i915_private *i915, u32 mask)
> +{
> +	WARN_ON(INTEL_GEN(i915) < 11);


should be drm_warn_on(), also I don't see any value in this warning.

> +
> +	/* 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)
> +{
> +	drm_dbg(&i915->drm, "%s was called\n", __func__);

Looks like something used for debug, should not be in the upstream version.
Saw a lot more of debug like this that should be removed.

> +
> +	return 0;
> +}
> +
> +static int intel_pxp_global_terminate_complete_callback(struct drm_i915_private *i915)
> +{
> +	drm_dbg(&i915->drm, ">>> %s\n", __func__);
> +
> +	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);
> +
> +	drm_dbg(&i915->drm, "%s was called with events=[%d]\n", __func__, events);
> +
> +	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)
>  {
>  	int ret;
>  
> 
> 
> 
> 
> 
> 
> 
>  	drm_info(&i915->drm, "i915_pxp_init\n");
>  
> 
> 
> 
> 
> 
> 
> 
> +	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 ret;
>  }
>  
> 
> 
> 
> 
> 
> 
> 
>  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 = gt->i915;
> +	const u32 events = iir & i915->pxp.handled_irr;
> +
> +	drm_dbg(&i915->drm, "%s was called with iir=[0x%04x]\n", __func__, iir);
> +
> +	lockdep_assert_held(&gt->irq_lock);
> +
> +	if (unlikely(!events)) {
> +		drm_dbg(&i915->drm, "%s returned due to iir=[0x%04x]\n", __func__, iir);
> +		goto end;
> +	}
> +
> +	intel_pxp_mask_irq(gt, i915->pxp.handled_irr);
> +
> +	i915->pxp.current_events |= events;
> +	schedule_work(&i915->pxp.irq_work);
> +end:
> +	return;
> +}
> diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.h b/drivers/gpu/drm/i915/pxp/intel_pxp.h
> index 578f1126bada..620774fc32e2 100644
> --- a/drivers/gpu/drm/i915/pxp/intel_pxp.h
> +++ b/drivers/gpu/drm/i915/pxp/intel_pxp.h
> @@ -8,14 +8,36 @@
>  
> 
> 
> 
> 
> 
> 
> 
>  #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 *r0ctx;
>  };
>  
> 
> 
> 
> 
> 
> 
> 
> +struct intel_gt;
>  struct drm_i915_private;
>  
> 
> 
> 
> 
> 
> 
> 
> +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);
>  
> 
> 
> 
> 
> 
> 
> 

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