[Intel-gfx] [PXP CLEAN PATCH v06 09/27] drm/i915/pxp: Implement funcs to get/set PXP tag

Sean Z Huang
2020-11-14T00:37:40Z

Implement the functions to get/set the PXP tag, which is 32-bit
bitwise value containing the hardware session info, such as its
session id, protection mode or whether it's enabled.

Signed-off-by: Huang, Sean Z <sean.z.huang@intel.com>
---
drivers/gpu/drm/i915/pxp/intel_pxp_sm.c | 105 ++++++++++++++++++++++++
drivers/gpu/drm/i915/pxp/intel_pxp_sm.h | 18 ++++
2 files changed, 123 insertions(+)

diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c
index 3dd5a9e3926b..fd5d10e71a27 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c
@@ -49,6 +49,16 @@ static int pxp_reg_write(struct drm_i915_private *i915, u32 offset, u32 regval)
return err;
}

+static u8 pxp_get_session_id(int session_index, int session_type)
+{
+ u8 session_id = session_index & SESSION_ID_MASK;
+
+ if (session_type == SESSION_TYPE_TYPE1)
+ session_id |= SESSION_TYPE_MASK;
+
+ return session_id;
+}
+
/**
* is_sw_session_active - Check if the given sw session id is active.
* @i915: i915 device handle.
@@ -86,6 +96,101 @@ static bool is_sw_session_active(struct drm_i915_private *i915, int session_type
return false;
}

+static int pxp_set_pxp_tag(struct drm_i915_private *i915, int session_type,
+ int session_idx, int protection_mode)
+{
+ struct pxp_tag *pxp_tag;
+ int ret;
+
+ if (!i915 || session_type >= SESSION_TYPE_MAX) {
+ ret = -EINVAL;
+ drm_dbg(&i915->drm, "Failed to %s, bad params\n", __func__);
+ goto end;
+ }
+
+ if (session_type == SESSION_TYPE_TYPE0 && session_idx < MAX_TYPE0_SESSIONS) {
+ pxp_tag = (struct pxp_tag *)&i915->pxp.r0ctx->type0_session_pxp_tag[session_idx];
+ } else if (session_type == SESSION_TYPE_TYPE1 && session_idx < MAX_TYPE1_SESSIONS) {
+ pxp_tag = (struct pxp_tag *)&i915->pxp.r0ctx->type1_session_pxp_tag[session_idx];
+ } else {
+ ret = -EINVAL;
+ drm_dbg(&i915->drm, "Failed to %s, bad params session_type=[%d], session_idx=[%d]\n",
+ __func__, session_type, session_idx);
+ goto end;
+ }
+
+ switch (protection_mode) {
+ case PROTECTION_MODE_NONE:
+ {
+ pxp_tag->enable = false;
+ pxp_tag->hm = false;
+ pxp_tag->sm = false;
+ break;
+ }
+ case PROTECTION_MODE_LM:
+ {
+ pxp_tag->enable = true;
+ pxp_tag->hm = false;
+ pxp_tag->sm = false;
+ pxp_tag->instance_id++;
+ break;
+ }
+ case PROTECTION_MODE_HM:
+ {
+ pxp_tag->enable = true;
+ pxp_tag->hm = true;
+ pxp_tag->sm = false;
+ pxp_tag->instance_id++;
+ break;
+ }
+ case PROTECTION_MODE_SM:
+ {
+ pxp_tag->enable = true;
+ pxp_tag->hm = true;
+ pxp_tag->sm = true;
+ pxp_tag->instance_id++;
+ break;
+ }
+ default:
+ ret = -EINVAL;
+ drm_dbg(&i915->drm, "Failed to %s, bad params protection_mode=[%d]\n",
+ __func__, protection_mode);
+ goto end;
+ }
+
+ pxp_tag->session_id = pxp_get_session_id(session_idx, session_type);
+
+ ret = 0;
+end:
+ return ret;
+}
+
+u32 intel_pxp_get_pxp_tag(struct drm_i915_private *i915, int session_idx,
+ int session_type, u32 *session_is_alive)
+{
+ struct pxp_tag *pxp_tag;
+
+ if (!i915 || session_type >= SESSION_TYPE_MAX) {
+ drm_dbg(&i915->drm, "Failed to %s, bad params\n", __func__);
+ return -EINVAL;
+ }
+
+ if (session_type == SESSION_TYPE_TYPE0 && session_idx < MAX_TYPE0_SESSIONS) {
+ pxp_tag = (struct pxp_tag *)&i915->pxp.r0ctx->type0_session_pxp_tag[session_idx];
+ } else if (session_type == SESSION_TYPE_TYPE1 && session_idx < MAX_TYPE1_SESSIONS) {
+ pxp_tag = (struct pxp_tag *)&i915->pxp.r0ctx->type1_session_pxp_tag[session_idx];
+ } else {
+ drm_dbg(&i915->drm, "Failed to %s, bad params session_type=[%d], session_idx=[%d]\n",
+ __func__, session_type, session_idx);
+ return -EINVAL;
+ }
+
+ if (session_is_alive)
+ *session_is_alive = pxp_tag->enable;
+
+ return pxp_tag->value;
+}
+
static bool is_hw_type0_session_in_play(struct drm_i915_private *i915, int session_index)
{
u32 regval_sip = 0;
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h
index a3149c18c831..c1f6b1be3fd1 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h
@@ -19,6 +19,9 @@
#define GEN12_KCR_TSIP_LOW _MMIO(0x32264) /* KCR type1 session in play 0-31 */
#define GEN12_KCR_TSIP_HIGH _MMIO(0x32268) /* KCR type1 session in play 32-63 */

+#define SESSION_TYPE_MASK BIT(7)
+#define SESSION_ID_MASK (BIT(7) - 1)
+
enum pxp_session_types {
SESSION_TYPE_TYPE0 = 0,
SESSION_TYPE_TYPE1 = 1,
@@ -35,6 +38,21 @@ enum pxp_protection_modes {
PROTECTION_MODE_ALL
};

+struct pxp_tag {
+ union {
+ u32 value;
+ struct {
+ u32 session_id : 8;
+ u32 instance_id : 8;
+ u32 enable : 1;
+ u32 hm : 1;
+ u32 reserved_1 : 1;
+ u32 sm : 1;
+ u32 reserved_2 : 12;
+ };
+ };
+};
+
/**
* struct pxp_protected_session - linked list to track all active sessions.
*/