Add GSC engine based method for sending PXP firmware packets
to the GSC firmware for MTL (and future) products.
Use the newly added helpers to populate the GSC-CS memory
header and send the message packet to the FW by dispatching
the GSC_HECI_CMD_PKT instruction on the GSC engine.
We use non-priveleged batches for submission to GSC engine
and require two buffers for the request:
- a buffer for the HECI packet that contains PXP FW commands
- a batch-buffer that contains the engine instruction for
sending the HECI packet to the GSC firmware.
Thus, add the allocation and freeing of these buffers in gsccs
init and fini.
Signed-off-by: Alan Previn <alan.previn.teres.alexis@xxxxxxxxx>
---
.../drm/i915/pxp/intel_pxp_cmd_interface_43.h | 4 +
drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c | 223 +++++++++++++++++-
drivers/gpu/drm/i915/pxp/intel_pxp_types.h | 7 +
3 files changed, 232 insertions(+), 2 deletions(-)
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 ad67e3f49c20..b2523d6918c7 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
@@ -12,6 +12,10 @@
/* PXP-Cmd-Op definitions */
#define PXP43_CMDID_START_HUC_AUTH 0x0000003A
+/* PXP-Packet sizes for MTL's GSCCS-HECI instruction */
+#define PXP43_MAX_HECI_IN_SIZE (SZ_32K)
+#define PXP43_MAX_HECI_OUT_SIZE (SZ_32K)
+
/* PXP-Input-Packet: HUC-Authentication */
struct pxp43_start_huc_auth_in {
struct pxp_cmd_header header;
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c
index 13693e78b57e..51b9959f7813 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c
@@ -6,19 +6,210 @@
#include "gem/i915_gem_internal.h"
#include "gt/intel_context.h"
+#include "gt/uc/intel_gsc_uc_heci_cmd_submit.h"
#include "i915_drv.h"
#include "intel_pxp_cmd_interface_43.h"
#include "intel_pxp_gsccs.h"
#include "intel_pxp_types.h"
+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,
+ u64 *gsc_msg_handle_retry)
+{
+ struct intel_gt *gt = pxp->ctrl_gt;
+ struct drm_i915_private *i915 = gt->i915;
+ struct gsccs_session_resources *exec = &pxp->gsccs_res;
+ struct intel_gsc_mtl_header *header = exec->pkt_vaddr;
+ struct intel_gsc_heci_non_priv_pkt pkt;
+ size_t max_msg_size;
+ u32 reply_size;
+ int ret;
+
+ if (!exec->ce)
+ return -ENODEV;
+
+ max_msg_size = PXP43_MAX_HECI_IN_SIZE - sizeof(*header);
+
+ if (msg_in_size > max_msg_size || msg_out_size_max > max_msg_size)
+ return -ENOSPC;
+
+ mutex_lock(&pxp->tee_mutex);
+
+ if (!exec->pkt_vma || !exec->bb_vma)
+ return -ENOENT;
+
+ memset(header, 0, sizeof(*header));
+ intel_gsc_uc_heci_cmd_emit_mtl_header(header, GSC_HECI_MEADDRESS_PXP,
+ msg_in_size + sizeof(*header),
+ exec->host_session_handle);
+
+ /* check if this is a host-session-handle cleanup call */
+ if (!msg_in && !msg_out)
+ header->flags |= GSC_HECI_FLAG_MSG_CLEANUP;
+
+ /* copy caller provided gsc message handle if this is polling for a prior msg completion */
+ header->gsc_message_handle = *gsc_msg_handle_retry;
+
+ /* NOTE: zero size packets are used for session-cleanups */
+ if (msg_in && msg_in_size)
+ memcpy(exec->pkt_vaddr + sizeof(*header), msg_in, msg_in_size);
+
+ pkt.addr_in = i915_vma_offset(exec->pkt_vma);
+ pkt.size_in = header->message_size;
+ pkt.addr_out = pkt.addr_in + PXP43_MAX_HECI_IN_SIZE;
+ pkt.size_out = msg_out_size_max + sizeof(*header);
+ pkt.heci_pkt_vma = exec->pkt_vma;
+ pkt.bb_vma = exec->bb_vma;
+
+ ret = intel_gsc_uc_heci_cmd_submit_nonpriv(>->uc.gsc,
+ exec->ce, &pkt, exec->bb_vaddr, 500);
+ if (ret) {
+ drm_err(&i915->drm, "failed to send gsc PXP msg (%d)\n", ret);
+ goto unlock;
+ }
+
+ /* we keep separate location for reply, so get the response header loc first */
+ header = exec->pkt_vaddr + PXP43_MAX_HECI_IN_SIZE;
+
+ /* Response validity marker, status and busyness */
+ if (header->validity_marker != GSC_HECI_VALIDITY_MARKER) {
+ drm_err(&i915->drm, "gsc PXP reply with invalid validity marker\n");
+ ret = -EINVAL;
+ goto unlock;
+ }
+ if (header->status != 0) {
+ drm_dbg(&i915->drm, "gsc PXP reply status has error = 0x%08x\n",
+ header->status);
+ ret = -EINVAL;
+ goto unlock;
+ }
+ 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;
+ }
+
+ reply_size = header->message_size - sizeof(*header);
+ if (reply_size > msg_out_size_max) {
+ drm_warn(&i915->drm, "caller with insufficient PXP reply size %u (%ld)\n",
+ reply_size, msg_out_size_max);
+ reply_size = msg_out_size_max;
+ } else if (reply_size != msg_out_size_max) {
+ drm_dbg(&i915->drm, "caller unexpected PXP reply size %u (%ld)\n",
+ reply_size, msg_out_size_max);
+ }
+
+ if (msg_out)
+ memcpy(msg_out, exec->pkt_vaddr + PXP43_MAX_HECI_IN_SIZE + sizeof(*header),
+ reply_size);
+ if (msg_out_len)
+ *msg_out_len = reply_size;
+
+unlock:
+ mutex_unlock(&pxp->tee_mutex);
+ return ret;
+}
+
+static int
+gsccs_create_buffer(struct intel_gt *gt,
+ const char *bufname, size_t size,
+ struct i915_vma **vma, void **map)
+{
+ struct drm_i915_private *i915 = gt->i915;
+ struct drm_i915_gem_object *obj;
+ int err = 0;
+
+ obj = i915_gem_object_create_internal(i915, size);
+ if (IS_ERR(obj)) {
+ drm_err(&i915->drm, "Failed to allocate gsccs backend %s.\n", bufname);
+ err = PTR_ERR(obj);
+ goto out_none;
+ }
+
+ *vma = i915_vma_instance(obj, gt->vm, NULL);
+ if (IS_ERR(*vma)) {
+ drm_err(&i915->drm, "Failed to vma-instance gsccs backend %s.\n", bufname);
+ err = PTR_ERR(*vma);
+ goto out_put;
+ }
+
+ /* return a virtual pointer */
+ *map = i915_gem_object_pin_map_unlocked(obj, i915_coherent_map_type(i915, obj, true));
+ if (IS_ERR(*map)) {
+ drm_err(&i915->drm, "Failed to map gsccs backend %s.\n", bufname);
+ err = PTR_ERR(*map);
+ goto out_put;
+ }
+
+ /* all PXP sessions commands are treated as non-priveleged */
+ err = i915_vma_pin(*vma, 0, 0, PIN_USER);
+ if (err) {
+ drm_err(&i915->drm, "Failed to vma-pin gsccs backend %s.\n", bufname);
+ goto out_unmap;
+ }
+
+ return 0;
+
+out_unmap:
+ i915_gem_object_unpin_map(obj);
+out_put:
+ i915_gem_object_put(obj);
+out_none:
+ *vma = NULL;
+ *map = NULL;
+
+ return err;
+}
+
+static void
+gsccs_cleanup_fw_host_session_handle(struct intel_pxp *pxp)
+{
+ struct drm_i915_private *i915 = pxp->ctrl_gt->i915;
+ u64 gsc_session_retry = 0;
+ int ret, tries = 0;
+
+ /*
+ * 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, NULL, 0, NULL, 0, NULL, &gsc_session_retry);
+ /* Only try again if gsc says so */
+ if (ret != -EAGAIN)
+ break;
+
+ msleep(20);
+ } while (++tries < 100);
+
+ if (ret)
+ drm_dbg(&i915->drm, "Failed to send gsccs msg host-session-cleanup: ret=[%d]\n",
+ ret);
+}
+
static void
gsccs_destroy_execution_resource(struct intel_pxp *pxp)
{
struct gsccs_session_resources *strm_res = &pxp->gsccs_res;
+ if (strm_res->host_session_handle)
+ gsccs_cleanup_fw_host_session_handle(pxp);
if (strm_res->ce)
intel_context_put(strm_res->ce);
+ if (strm_res->bb_vma)
+ i915_vma_unpin_and_release(&strm_res->bb_vma, I915_VMA_RELEASE_MAP);
+ if (strm_res->pkt_vma)
+ i915_vma_unpin_and_release(&strm_res->pkt_vma, I915_VMA_RELEASE_MAP);
memset(strm_res, 0, sizeof(*strm_res));
}
@@ -30,6 +221,7 @@ gsccs_allocate_execution_resource(struct intel_pxp *pxp)
struct gsccs_session_resources *strm_res = &pxp->gsccs_res;
struct intel_engine_cs *engine = gt->engine[GSC0];
struct intel_context *ce;
+ int err = 0;
/*
* First, ensure the GSC engine is present.
@@ -38,16 +230,43 @@ gsccs_allocate_execution_resource(struct intel_pxp *pxp)
if (!engine)
return -ENODEV;
+ /*
+ * Now, allocate, pin and map two objects, one for the heci message packet
+ * and another for the batch buffer we submit into GSC engine (that includes the packet).
+ * NOTE: GSC-CS backend is currently only supported on MTL, so we allocate shmem.
+ */
+ err = gsccs_create_buffer(pxp->ctrl_gt, "Heci Packet",
+ PXP43_MAX_HECI_IN_SIZE + PXP43_MAX_HECI_OUT_SIZE,
+ &strm_res->pkt_vma, &strm_res->pkt_vaddr);
+ if (err)
+ return err;
+
+ err = gsccs_create_buffer(pxp->ctrl_gt, "Batch Buffer", PAGE_SIZE,
+ &strm_res->bb_vma, &strm_res->bb_vaddr);
+ if (err)
+ goto free_pkt;
+
/* Finally, create an intel_context to be used during the submission */
ce = intel_context_create(engine);
if (IS_ERR(ce)) {
drm_err(>->i915->drm, "Failed creating gsccs backend ctx\n");
- return PTR_ERR(ce);
+ err = PTR_ERR(ce);
+ goto free_batch;
}
-
strm_res->ce = ce;
+ /* initialize host-session-handle (for all i915-to-gsc-firmware PXP cmds) */
+ get_random_bytes(&strm_res->host_session_handle, sizeof(strm_res->host_session_handle));
+
return 0;
+
+free_pkt:
+ i915_vma_unpin_and_release(&strm_res->pkt_vma, I915_VMA_RELEASE_MAP);
+free_batch:
+ i915_vma_unpin_and_release(&strm_res->bb_vma, I915_VMA_RELEASE_MAP);
+ memset(strm_res, 0, sizeof(*strm_res));
+
+ return err;
}
void intel_pxp_gsccs_fini(struct intel_pxp *pxp)
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_types.h b/drivers/gpu/drm/i915/pxp/intel_pxp_types.h
index d3819ec81a0c..329d58adddd8 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_types.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_types.h
@@ -37,6 +37,13 @@ struct intel_pxp {
*/
struct gsccs_session_resources {
struct intel_context *ce; /* context for gsc command submission */
+ u64 host_session_handle; /* used by firmware to tie commands to processes */
+
+ struct i915_vma *pkt_vma; /* GSC FW cmd packet vma */
+ void *pkt_vaddr; /* GSC FW cmd packet virt pointer */
+
+ struct i915_vma *bb_vma; /* HECI_PKT batch buffer vma */
+ void *bb_vaddr; /* HECI_PKT batch buffer virt pointer */
} gsccs_res;
/**
--
2.39.0
