[Intel-gfx] [PATCH v5 01/40] drm: hdcp2.2 authentication msg definitions
C, Ramalingam
ramalingam.c at intel.com
Wed Jul 11 17:57:08 UTC 2018
Thanks seanpaul for the reviews.
> -----Original Message-----
> From: Sean Paul [mailto:seanpaul at chromium.org]
> Sent: Tuesday, July 10, 2018 1:51 AM
> To: C, Ramalingam <ramalingam.c at intel.com>
> Cc: intel-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org;
> daniel at ffwll.ch; Winkler, Tomas <tomas.winkler at intel.com>; Usyskin,
> Alexander <alexander.usyskin at intel.com>; Shankar, Uma
> <uma.shankar at intel.com>
> Subject: Re: [Intel-gfx] [PATCH v5 01/40] drm: hdcp2.2 authentication msg
> definitions
>
> On Wed, Jun 27, 2018 at 02:09:50PM +0530, Ramalingam C wrote:
> > This patch defines the hdcp2.2 protocol messages for authentication.
> >
> > v2:
> > bit_fields are removed. Instead bitmasking used. [Tomas and Jani]
> > prefix HDCP_2_2_ is added to the macros. [Tomas]
> > v3:
> > No Changes.
> > v4:
> > Style and spellings are fixed [Uma]
> > v5:
> > Fix for macros.
> >
> > Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
> > ---
> > include/drm/drm_hdcp.h | 179
> > +++++++++++++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 179 insertions(+)
> >
> > diff --git a/include/drm/drm_hdcp.h b/include/drm/drm_hdcp.h index
> > 98e63d870139..3e963c5d04b2 100644
> > --- a/include/drm/drm_hdcp.h
> > +++ b/include/drm/drm_hdcp.h
> > @@ -38,4 +38,183 @@
> > #define DRM_HDCP_DDC_BSTATUS 0x41
> > #define DRM_HDCP_DDC_KSV_FIFO 0x43
> >
> > +#define DRM_HDCP_1_4_SRM_ID 0x8
> > +#define DRM_HDCP_1_4_VRL_LENGTH_SIZE 3
> > +#define DRM_HDCP_1_4_DCP_SIG_SIZE 40
>
> These don't seem to be related to the patch?
>
> > +
> > +/* Protocol message definition for HDCP2.2 specification */
> > +#define HDCP_STREAM_TYPE0 0x00
> > +#define HDCP_STREAM_TYPE1 0x01
>
> Why not HDCP_2_2 prefix?
Though they are introduced at HDCP2.2, this is classification of the streams.
And Type 0 can be transmitted on HDCP1.4.
So keeping it as generic name with no version mentioned.
>
> > +
> > +/* HDCP2.2 Msg IDs */
> > +#define HDCP_2_2_NULL_MSG 1
> > +#define HDCP_2_2_AKE_INIT 2
> > +#define HDCP_2_2_AKE_SEND_CERT 3
> > +#define HDCP_2_2_AKE_NO_STORED_KM 4
> > +#define HDCP_2_2_AKE_STORED_KM 5
> > +#define HDCP_2_2_AKE_SEND_HPRIME 7
> > +#define HDCP_2_2_AKE_SEND_PAIRING_INFO 8
> > +#define HDCP_2_2_LC_INIT 9
> > +#define HDCP_2_2_LC_SEND_LPRIME 10
> > +#define HDCP_2_2_SKE_SEND_EKS 11
> > +#define HDCP_2_2_REP_SEND_RECVID_LIST 12
> > +#define HDCP_2_2_REP_SEND_ACK 15
> > +#define HDCP_2_2_REP_STREAM_MANAGE 16
> > +#define HDCP_2_2_REP_STREAM_READY 17
> > +#define HDCP_2_2_ERRATA_DP_STREAM_TYPE 50
> > +
> > +#define HDCP_2_2_RTX_LEN 8
> > +#define HDCP_2_2_RRX_LEN 8
> > +
> > +#define HDCP_2_2_K_PUB_RX_MOD_N_LEN 128
> > +#define HDCP_2_2_K_PUB_RX_EXP_E_LEN 3
> > +#define HDCP_2_2_K_PUB_RX_LEN
> (HDCP_2_2_K_PUB_RX_MOD_N_LEN + \
> > +
> HDCP_2_2_K_PUB_RX_EXP_E_LEN)
> > +
> > +#define HDCP_2_2_DCP_LLC_SIG_LEN 384
> > +
> > +#define HDCP_2_2_E_KPUB_KM_LEN 128
> > +#define HDCP_2_2_E_KH_KM_M_LEN (16 + 16)
> > +#define HDCP_2_2_H_PRIME_LEN 32
> > +#define HDCP_2_2_E_KH_KM_LEN 16
> > +#define HDCP_2_2_RN_LEN 8
> > +#define HDCP_2_2_L_PRIME_LEN 32
> > +#define HDCP_2_2_E_DKEY_KS_LEN 16
> > +#define HDCP_2_2_RIV_LEN 8
> > +#define HDCP_2_2_SEQ_NUM_LEN 3
> > +#define HDCP_2_2_LPRIME_HALF_LEN
> (HDCP_2_2_L_PRIME_LEN / 2)
> > +#define HDCP_2_2_RECEIVER_ID_LEN DRM_HDCP_KSV_LEN
> > +#define HDCP_2_2_MAX_DEVICE_COUNT 31
> > +#define HDCP_2_2_RECEIVER_IDS_MAX_LEN
> (HDCP_2_2_RECEIVER_ID_LEN * \
> > +
> HDCP_2_2_MAX_DEVICE_COUNT)
> > +#define HDCP_2_2_MPRIME_LEN 32
> > +
> > +/* Following Macros take a byte at a time for bit(s) masking */
> > +/*
> > + * TODO: This has to be changed for DP MST, as multiple stream on
> > + * same port is possible.
> > + * For HDCP2.2 on HDMI and DP SST this value is always 1.
> > + */
> > +#define HDCP_2_2_MAX_CONTENT_STREAMS_CNT 1
> > +#define HDCP_2_2_TXCAP_MASK_LEN 2
> > +#define HDCP_2_2_RXCAPS_LEN 3
> > +#define HDCP_2_2_RX_REPEATER(x) ((x) & BIT(0))
> > +#define HDCP_2_2_DP_HDCP_CAPABLE(x) ((x) & BIT(1))
> > +#define HDCP_2_2_RXINFO_LEN 2
> > +
> > +/* HDCP1.x compliant device in downstream */
> > +#define HDCP_2_2_HDCP1_DEVICE_CONNECTED(x) ((x) & BIT(0))
> > +
> > +/* HDCP2.0 Compliant repeater in downstream */
> > +#define HDCP_2_2_HDCP_2_0_REP_CONNECTED(x) ((x) & BIT(1))
> > +#define HDCP_2_2_MAX_CASCADE_EXCEEDED(x) ((x) & BIT(2))
> > +#define HDCP_2_2_MAX_DEVS_EXCEEDED(x) ((x) & BIT(3))
> > +#define HDCP_2_2_DEV_COUNT_LO(x) (((x) & (0xF << 4)) >> 4)
> > +#define HDCP_2_2_DEV_COUNT_HI(x) ((x) & BIT(0))
> > +#define HDCP_2_2_DEPTH(x) (((x) & (0x7 << 1)) >> 1)
> > +
> > +struct hdcp2_cert_rx {
> > + uint8_t receiver_id[HDCP_2_2_RECEIVER_ID_LEN];
> > + uint8_t kpub_rx[HDCP_2_2_K_PUB_RX_LEN];
> > + uint8_t reserved[2];
> > + uint8_t dcp_signature[HDCP_2_2_DCP_LLC_SIG_LEN];
> > +} __packed;
> > +
> > +struct hdcp2_streamid_type {
> > + uint8_t stream_id;
> > + uint8_t stream_type;
> > +} __packed;
> > +
> > +/*
> > + * The TxCaps field specified in the HDCP HDMI, DP specs
> > + * This field is big endian as specified in the errata.
> > + */
> > +struct hdcp2_tx_caps {
> > + /* Transmitter must set this to 0x2 */
> > + uint8_t version;
> > +
> > + /* Reserved for HDCP and DP Spec. Read as Zero */
> > + uint8_t tx_cap_mask[HDCP_2_2_TXCAP_MASK_LEN];
> > +} __packed;
> > +
> > +/* Main structures for HDCP2.2 protocol communication */ struct
> > +hdcp2_ake_init {
> > + uint8_t msg_id;
> > + uint8_t r_tx[HDCP_2_2_RTX_LEN];
> > + struct hdcp2_tx_caps tx_caps;
> > +} __packed;
> > +
> > +struct hdcp2_ake_send_cert {
> > + uint8_t msg_id;
> > + struct hdcp2_cert_rx cert_rx;
> > + uint8_t r_rx[HDCP_2_2_RRX_LEN];
> > + uint8_t rx_caps[HDCP_2_2_RXCAPS_LEN];
> > +} __packed;
> > +
> > +struct hdcp2_ake_no_stored_km {
> > + uint8_t msg_id;
> > + uint8_t e_kpub_km[HDCP_2_2_E_KPUB_KM_LEN];
> > +} __packed;
> > +
> > +struct hdcp2_ake_stored_km {
> > + uint8_t msg_id;
> > + uint8_t e_kh_km_m[HDCP_2_2_E_KH_KM_M_LEN];
> > +} __packed;
> > +
> > +struct hdcp2_ake_send_hprime {
> > + uint8_t msg_id;
> > + uint8_t h_prime[HDCP_2_2_H_PRIME_LEN];
> > +} __packed;
> > +
> > +struct hdcp2_ake_send_pairing_info {
> > + uint8_t msg_id;
> > + uint8_t e_kh_km[HDCP_2_2_E_KH_KM_LEN];
> > +} __packed;
> > +
> > +struct hdcp2_lc_init {
> > + uint8_t msg_id;
> > + uint8_t r_n[HDCP_2_2_RN_LEN];
> > +} __packed;
> > +
> > +struct hdcp2_lc_send_lprime {
> > + uint8_t msg_id;
> > + uint8_t l_prime[HDCP_2_2_L_PRIME_LEN];
> > +} __packed;
> > +
> > +struct hdcp2_ske_send_eks {
> > + uint8_t msg_id;
> > + uint8_t e_dkey_ks[HDCP_2_2_E_DKEY_KS_LEN];
> > + uint8_t riv[HDCP_2_2_RIV_LEN];
> > +} __packed;
> > +
> > +struct hdcp2_rep_send_receiverid_list {
> > + uint8_t msg_id;
> > + uint8_t rx_info[HDCP_2_2_RXINFO_LEN];
> > + uint8_t seq_num_v[HDCP_2_2_SEQ_NUM_LEN];
> > + uint8_t v_prime[HDCP_2_2_LPRIME_HALF_LEN];
> > + uint8_t
> receiver_ids[HDCP_2_2_RECEIVER_IDS_MAX_LEN];
> > +} __packed;
> > +
> > +struct hdcp2_rep_send_ack {
> > + uint8_t msg_id;
> > + uint8_t v[HDCP_2_2_LPRIME_HALF_LEN];
> > +} __packed;
> > +
> > +struct hdcp2_rep_stream_manage {
> > + uint8_t msg_id;
> > + uint8_t seq_num_m[HDCP_2_2_SEQ_NUM_LEN];
> > + __be16 k;
> > + struct hdcp2_streamid_type
> > +streams[HDCP_2_2_MAX_CONTENT_STREAMS_CNT];
> > +} __packed;
> > +
> > +struct hdcp2_rep_stream_ready {
> > + uint8_t msg_id;
> > + uint8_t m_prime[HDCP_2_2_MPRIME_LEN];
> > +} __packed;
> > +
> > +struct hdcp2_dp_errata_stream_type {
> > + uint8_t msg_id;
> > + uint8_t stream_type;
> > +} __packed;
>
> Perhaps this has already been asked and answered, but do all of these need to
> be __packed? This is kind of the problem with adding a bunch of unused
> structures to a patch, it's hard to see what their usage is. In future, these should
> probably be introduced when they're being used.
These are the HDCP2.2 message defined at HDCP2.2 spec. And they needs to be
__packed just to have exact size mentioned by spec.
Like how we have HDCP1.4 and 2.2 macros defined as per the HDCP spec definitions,
defined the HDCP2.2 messages together here.
Thanks,
Ram.
>
> Sean
>
> > +
> > #endif
> > --
> > 2.7.4
> >
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx at lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
> --
> Sean Paul, Software Engineer, Google / Chromium OS
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