Add MTL's function for ARB session creation using PXP firmware
version 4.3 ABI structure format.
Before checking the return status, look at the GSC-CS-Mem-Header's
pending-bit which means the GSC firmware is busy and we should
resubmit.
Signed-off-by: Alan Previn <alan.previn.teres.alexis@xxxxxxxxx>
---
drivers/gpu/drm/i915/pxp/intel_pxp.c | 9 +++-
.../drm/i915/pxp/intel_pxp_cmd_interface_43.h | 21 ++++++++
drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c | 54 ++++++++++++++++++-
drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h | 2 +
drivers/gpu/drm/i915/pxp/intel_pxp_session.c | 6 ++-
5 files changed, 87 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.c b/drivers/gpu/drm/i915/pxp/intel_pxp.c
index 4350921e40c4..9b56f743eac9 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c
@@ -297,8 +297,13 @@ int intel_pxp_start(struct intel_pxp *pxp)
if (!intel_pxp_is_enabled(pxp))
return -ENODEV;
- if (wait_for(pxp_component_bound(pxp), 250))
- return -ENXIO;
+ if (HAS_ENGINE(pxp->ctrl_gt, GSC0)) {
+ if (wait_for(intel_uc_fw_is_running(&pxp->ctrl_gt->uc.gsc.fw), 250))
+ return -ENXIO;
+ } else {
+ if (wait_for(pxp_component_bound(pxp), 250))
+ return -ENXIO;
+ }
mutex_lock(&pxp->arb_mutex);
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_cmd_interface_43.h b/drivers/gpu/drm/i915/pxp/intel_pxp_cmd_interface_43.h
index b2523d6918c7..9089e02a8c2d 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_cmd_interface_43.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_cmd_interface_43.h
@@ -11,6 +11,7 @@
/* PXP-Cmd-Op definitions */
#define PXP43_CMDID_START_HUC_AUTH 0x0000003A
+#define PXP43_CMDID_INIT_SESSION 0x00000036
/* PXP-Packet sizes for MTL's GSCCS-HECI instruction */
#define PXP43_MAX_HECI_IN_SIZE (SZ_32K)
@@ -27,4 +28,24 @@ struct pxp43_start_huc_auth_out {
struct pxp_cmd_header header;
} __packed;
+/* PXP-Input-Packet: Init PXP session */
+struct pxp43_create_arb_in {
+ struct pxp_cmd_header header;
+ /* header.stream_id fields for vesion 4.3 of Init PXP session: */
+ #define PXP43_INIT_SESSION_VALID BIT(0)
+ #define PXP43_INIT_SESSION_APPTYPE BIT(1)
+ #define PXP43_INIT_SESSION_APPID GENMASK(17, 2)
+ u32 protection_mode;
+ #define PXP43_INIT_SESSION_PROTECTION_ARB 0x2
+ u32 sub_session_id;
+ u32 init_flags;
+ u32 rsvd[12];
+} __packed;
+
+/* PXP-Input-Packet: Init PXP session */
+struct pxp43_create_arb_out {
+ struct pxp_cmd_header header;
+ u32 rsvd[8];
+} __packed;
+
#endif /* __INTEL_PXP_FW_INTERFACE_43_H__ */
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c
index 35b6bfa55dfc..066df4fc001f 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c
@@ -13,11 +13,11 @@
#include "intel_pxp_gsccs.h"
#include "intel_pxp_types.h"
-__maybe_unused
static int gsccs_send_message(struct intel_pxp *pxp,
void *msg_in, size_t msg_in_size,
void *msg_out, size_t msg_out_size_max,
- size_t *msg_out_len)
+ size_t *msg_out_len,
+ u64 *gsc_msg_handle_retry)
{
struct intel_gt *gt = pxp->ctrl_gt;
struct drm_i915_private *i915 = gt->i915;
@@ -46,6 +46,9 @@ static int gsccs_send_message(struct intel_pxp *pxp,
msg_in_size + sizeof(*header),
exec->host_session_handle);
+ /* copy caller provided gsc message handle if this is polling for a prior msg completion */
+ header->gsc_message_handle = *gsc_msg_handle_retry;
+
memcpy(exec->pkt_vaddr + sizeof(*header), msg_in, msg_in_size);
pkt.addr_in = i915_vma_offset(exec->pkt_vma);
@@ -79,6 +82,13 @@ static int gsccs_send_message(struct intel_pxp *pxp,
}
if (header->flags & GSC_HECI_FLAG_MSG_PENDING) {
drm_dbg(&i915->drm, "gsc PXP reply is busy\n");
+ /*
+ * When the GSC firmware replies with pending bit, it means that the requested
+ * operation has begun but the completion is pending and the caller needs
+ * to re-request with the gsc_message_handle that was returned by the firmware.
+ * until the pending bit is turned off.
+ */
+ *gsc_msg_handle_retry = header->gsc_message_handle;
ret = -EAGAIN;
goto unlock;
}
@@ -103,6 +113,46 @@ static int gsccs_send_message(struct intel_pxp *pxp,
return ret;
}
+int intel_pxp_gsccs_create_session(struct intel_pxp *pxp,
+ int arb_session_id)
+{
+ struct gsccs_session_resources *exec = &pxp->gsccs_res;
+ struct pxp43_create_arb_in msg_in = {0};
+ struct pxp43_create_arb_out msg_out = {0};
+ u64 gsc_session_retry = 0;
+ int ret, tries = 0;
+
+ /* get a unique host-session-handle (used later in HW cmds) at time of session creation */
+ get_random_bytes(&exec->host_session_handle, sizeof(exec->host_session_handle));
+
+ msg_in.header.api_version = PXP_APIVER(4, 3);
+ msg_in.header.command_id = PXP43_CMDID_INIT_SESSION;
+ msg_in.header.stream_id = (FIELD_PREP(PXP43_INIT_SESSION_APPID, arb_session_id) |
+ FIELD_PREP(PXP43_INIT_SESSION_VALID, 1) |
+ FIELD_PREP(PXP43_INIT_SESSION_APPTYPE, 0));
+ msg_in.header.buffer_len = sizeof(msg_in) - sizeof(msg_in.header);
+ msg_in.protection_mode = PXP43_INIT_SESSION_PROTECTION_ARB;
+
+ /*
+ * Keep sending request if GSC firmware was busy.
+ * Based on specs, we can expects a worst case pending-bit
+ * delay of 2000 milisecs.
+ */
+ do {
+ ret = gsccs_send_message(pxp,
+ &msg_in, sizeof(msg_in),
+ &msg_out, sizeof(msg_out), NULL,
+ &gsc_session_retry);
+ /* Only try again if gsc says so */
+ if (ret != -EAGAIN)
+ break;
+
+ msleep(20);
+ } while (++tries < 100);
+
+ return ret;
+}
+
static int
gsccs_create_buffer(struct intel_gt *gt,
const char *bufname, size_t size,
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h
index 354ea9a8f940..4a381ede00f5 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h
@@ -11,6 +11,8 @@
struct intel_pxp;
#ifdef CONFIG_DRM_I915_PXP
+int intel_pxp_gsccs_create_session(struct intel_pxp *pxp,
+ int arb_session_id);
void intel_pxp_gsccs_fini(struct intel_pxp *pxp);
int intel_pxp_gsccs_init(struct intel_pxp *pxp);
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_session.c b/drivers/gpu/drm/i915/pxp/intel_pxp_session.c
index 28f5ca838cb7..a4917d517e23 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_session.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_session.c
@@ -7,6 +7,7 @@
#include "intel_pxp.h"
#include "intel_pxp_cmd.h"
+#include "intel_pxp_gsccs.h"
#include "intel_pxp_session.h"
#include "intel_pxp_tee.h"
#include "intel_pxp_types.h"
@@ -62,7 +63,10 @@ static int pxp_create_arb_session(struct intel_pxp *pxp)
return -EEXIST;
}
- ret = intel_pxp_tee_cmd_create_arb_session(pxp, ARB_SESSION);
+ if (HAS_ENGINE(pxp->ctrl_gt, GSC0))
+ ret = intel_pxp_gsccs_create_session(pxp, ARB_SESSION);
+ else
+ ret = intel_pxp_tee_cmd_create_arb_session(pxp, ARB_SESSION);
if (ret) {
drm_err(>->i915->drm, "tee cmd for arb session creation failed\n");
return ret;
--
2.39.0
