Quoting Huang, Sean Z (2020-12-10 07:24:15)
> PXP (Protected Xe Path) is an i915 componment, available on GEN12+,
> that helps to establish the hardware protected session and manage
> the status of the alive software session, as well as its life cycle.
>
> This patch series is to allow the kernel space to create and
> manage a single hardware session (a.k.a default session or
> arbitrary session). So Mesa can allocate the protected buffer,
> which is encrypted with the leverage of the arbitrary hardware
> session.
>
> Signed-off-by: Huang, Sean Z <sean.z.huang@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/Kconfig | 19 +++++++++++++
> drivers/gpu/drm/i915/Makefile | 5 ++++
> drivers/gpu/drm/i915/gt/intel_gt.c | 7 +++++
> drivers/gpu/drm/i915/gt/intel_gt_types.h | 3 ++
> drivers/gpu/drm/i915/pxp/intel_pxp.c | 27 ++++++++++++++++++
> drivers/gpu/drm/i915/pxp/intel_pxp.h | 29 ++++++++++++++++++++
> drivers/gpu/drm/i915/pxp/intel_pxp_context.c | 27 ++++++++++++++++++
> drivers/gpu/drm/i915/pxp/intel_pxp_context.h | 22 +++++++++++++++
> 8 files changed, 139 insertions(+)
> create mode 100644 drivers/gpu/drm/i915/pxp/intel_pxp.c
> create mode 100644 drivers/gpu/drm/i915/pxp/intel_pxp.h
> create mode 100644 drivers/gpu/drm/i915/pxp/intel_pxp_context.c
> create mode 100644 drivers/gpu/drm/i915/pxp/intel_pxp_context.h
>
> diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
> index 1e1cb245fca7..a42b9b031455 100644
> --- a/drivers/gpu/drm/i915/Kconfig
> +++ b/drivers/gpu/drm/i915/Kconfig
> @@ -130,6 +130,25 @@ config DRM_I915_GVT_KVMGT
> Choose this option if you want to enable KVMGT support for
> Intel GVT-g.
>
> +config DRM_I915_PXP
> + bool "Enable Intel PXP support for Intel Gen12+ platform"
> + depends on DRM_I915
> + select INTEL_MEI_PXP
Doesn't exist.
Kconfig dependency resolution is not recursive; you probably will need a
depends on INTEL_MEI
> + default n
So this is dead code then?
If the recommendation is not to enable it, and you don't even add it to
CI for testing, what's it for?
> + help
> + This option selects INTEL_MEI_ME if it isn't already selected to
> + enabled full PXP Services on Intel platforms.
> +
> + PXP (Protected Xe Path) is an i915 componment, available on GEN12+,
> + that helps to establish the hardware protected session and manage
> + the status of the alive software session, as well as its life cycle.
> +
> + This patch series is to allow the kernel space to create and
> + manage a single hardware session (a.k.a default session or
> + arbitrary session). So Mesa can allocate the protected buffer,
> + which is encrypted with the leverage of the arbitrary hardware
> + session.
Mesa is but one user; the first but not last.
> +
> menu "drm/i915 Debugging"
> depends on DRM_I915
> depends on EXPERT
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index e5574e506a5c..99efac469cc2 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -254,6 +254,11 @@ i915-y += \
>
> i915-y += i915_perf.o
>
> +# Protected execution platform (PXP) support
> +i915-$(CONFIG_DRM_I915_PXP) += \
> + pxp/intel_pxp.o \
> + pxp/intel_pxp_context.o
> +
> # Post-mortem debug and GPU hang state capture
> i915-$(CONFIG_DRM_I915_CAPTURE_ERROR) += i915_gpu_error.o
> i915-$(CONFIG_DRM_I915_SELFTEST) += \
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
> index 44f1d51e5ae5..d8e20ede7326 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt.c
> +++ b/drivers/gpu/drm/i915/gt/intel_gt.c
> @@ -584,6 +584,12 @@ int intel_gt_init(struct intel_gt *gt)
> if (err)
> goto err_gt;
>
> + if (INTEL_GEN(gt->i915) >= 12) {
Just call it.
> + err = intel_pxp_init(>->pxp);
> + if (err)
Not an error; the system can survive without, and userspace can detect
the feature.
> + goto err_gt;
> + }
> +
> goto out_fw;
> err_gt:
> __intel_gt_disable(gt);
> @@ -638,6 +644,7 @@ void intel_gt_driver_release(struct intel_gt *gt)
> if (vm) /* FIXME being called twice on error paths :( */
> i915_vm_put(vm);
>
> + intel_pxp_uninit(>->pxp);
How often have we used uninit?
> intel_gt_pm_fini(gt);
> intel_gt_fini_scratch(gt);
> intel_gt_fini_buffer_pool(gt);
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_types.h b/drivers/gpu/drm/i915/gt/intel_gt_types.h
> index 6d39a4a11bf3..05255632c2c0 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt_types.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gt_types.h
> @@ -23,6 +23,7 @@
> #include "intel_rc6_types.h"
> #include "intel_rps_types.h"
> #include "intel_wakeref.h"
> +#include "pxp/intel_pxp.h"
Only include the types from a types.h
Includes from other layers in their own section.
>
> struct drm_i915_private;
> struct i915_ggtt;
> @@ -120,6 +121,8 @@ struct intel_gt {
> /* Slice/subslice/EU info */
> struct sseu_dev_info sseu;
> } info;
> +
> + struct intel_pxp pxp;
> };
>
> enum intel_gt_scratch_field {
> diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.c b/drivers/gpu/drm/i915/pxp/intel_pxp.c
> new file mode 100644
> index 000000000000..ba43b2c923c7
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c
> @@ -0,0 +1,27 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright(c) 2020 Intel Corporation.
> + */
> +#include "i915_drv.h"
> +#include "intel_pxp.h"
> +#include "intel_pxp_context.h"
> +
> +int intel_pxp_init(struct intel_pxp *pxp)
> +{
> + struct intel_gt *gt = container_of(pxp, struct intel_gt, pxp);
You are not inside gt/, wise not to bake in such embedded assumptions.
i.e. all the container_of(pxp)->i915->pxp will be far less fragile with
a pxp->global = >->i915->pxp.
> + /* PXP only available for GEN12+ */
> + if (INTEL_GEN(gt->i915) < 12)
> + return -ENODEV;
> +
> + intel_pxp_ctx_init(&pxp->ctx);
> +
> + drm_info(>->i915->drm, "Protected Xe Path (PXP) protected content support initialized\n");
Reconsider; this should only be at most once per device.
> + return 0;
> +}
> +
> +void intel_pxp_uninit(struct intel_pxp *pxp)
> +{
> + intel_pxp_ctx_fini(&pxp->ctx);
> +}
> diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.h b/drivers/gpu/drm/i915/pxp/intel_pxp.h
> new file mode 100644
> index 000000000000..7c3d49a6a3ab
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/pxp/intel_pxp.h
> @@ -0,0 +1,29 @@
> +/* SPDX-License-Identifier: MIT */
> +/*
> + * Copyright(c) 2020, Intel Corporation. All rights reserved.
> + */
> +
> +#ifndef __INTEL_PXP_H__
> +#define __INTEL_PXP_H__
> +
> +#include "intel_pxp_context.h"
> +
> +struct intel_pxp {
> + struct pxp_context ctx;
> +};
> +
> +#ifdef CONFIG_DRM_I915_PXP
> +int intel_pxp_init(struct intel_pxp *pxp);
> +void intel_pxp_uninit(struct intel_pxp *pxp);
> +#else
> +static inline int intel_pxp_init(struct intel_pxp *pxp)
> +{
> + return 0;
> +}
> +
> +static inline void intel_pxp_uninit(struct intel_pxp *pxp)
> +{
> +}
> +#endif
> +
> +#endif /* __INTEL_PXP_PM_H__ */
> diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_context.c b/drivers/gpu/drm/i915/pxp/intel_pxp_context.c
> new file mode 100644
> index 000000000000..5ffaf55dc7df
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_context.c
> @@ -0,0 +1,27 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright(c) 2020, Intel Corporation. All rights reserved.
> + */
> +
> +#include "intel_pxp_context.h"
> +#include <linux/random.h>
System includes first.
> +
> +/**
> + * intel_pxp_ctx_init - To init a pxp context.
> + * @ctx: pointer to ctx structure.
> + */
> +void intel_pxp_ctx_init(struct pxp_context *ctx)
> +{
> + get_random_bytes(&ctx->id, sizeof(ctx->id));
As already stated, this randomisation does not add any security; and
does not mean you can safely have multiple contexts without collision.
What you had in mind was an ida.
> +
> + mutex_init(&ctx->mutex);
> +}
> +
> +/**
> + * intel_pxp_ctx_fini - To finish the pxp context.
> + * @ctx: pointer to ctx structure.
> + */
> +void intel_pxp_ctx_fini(struct pxp_context *ctx)
> +{
> + ctx->id = 0;
> +}
> diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_context.h b/drivers/gpu/drm/i915/pxp/intel_pxp_context.h
> new file mode 100644
> index 000000000000..953a2e700931
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_context.h
> @@ -0,0 +1,22 @@
> +/* SPDX-License-Identifier: MIT */
> +/*
> + * Copyright(c) 2020, Intel Corporation. All rights reserved.
> + */
> +
> +#ifndef __INTEL_PXP_CONTEXT_H__
> +#define __INTEL_PXP_CONTEXT_H__
> +
> +#include <linux/mutex.h>
> +
> +/* struct pxp_context - Represents combined view of driver and logical HW states. */
> +struct pxp_context {
> + /** @mutex: mutex to protect the pxp context */
> + struct mutex mutex;
> +
> + int id;
> +};
> +
> +void intel_pxp_ctx_init(struct pxp_context *ctx);
> +void intel_pxp_ctx_fini(struct pxp_context *ctx);
> +
> +#endif /* __INTEL_PXP_CONTEXT_H__ */
> --
> 2.17.1
>
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