Quoting Huang, Sean Z (2020-11-15 23:08:08)
> Create the arbitrary session, with the fixed session id 0xf, after
> system boot, for the case that application allocates the protected
> buffer without establishing any protection session. Because the
> hardware requires at least one alive session for protected buffer
> creation. This arbitrary session needs to be re-created after
> teardown or power event because hardware encryption key won't be
> valid after such cases.
>
> Signed-off-by: Huang, Sean Z <sean.z.huang@xxxxxxxxx>
<SNIP>
> +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.h
> @@ -16,4 +16,10 @@ int pxp_tee_ioctl_io_message(struct drm_i915_private *i915,
> void __user *msg_out_user_ptr, u32 *msg_out_size_ptr,
> u32 msg_out_buf_size);
>
> +int intel_pxp_tee_cmd_create_arb_session(struct drm_i915_private *i915);
> +
> +/* TEE command to create the arbitrary session */
> +#define PXP_TEE_ARB_CMD_BIN {0x00040000, 0x0000001e, 0x00000000, 0x00000008, 0x00000002, 0x0000000f}
> +#define PXP_TEE_ARB_CMD_DW_LEN (6)
This is a BLOB so it doesn't belong to kernel source code. It could be
considered in linux-firmware. As it's only an init sequence I'm not sure
how that will be perceived.
Probably best to ask.
Regards, Joonas
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