1 files changed, 184 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/xe_gsc_submit.c b/drivers/gpu/drm/xe/xe_gsc_submit.c
new file mode 100644
index 000000000000..8c5381e5913f
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_gsc_submit.c
@@ -0,0 +1,184 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2023 Intel Corporation
+ */
+
+#include "xe_gsc_submit.h"
+
+#include "abi/gsc_command_header_abi.h"
+#include "xe_bb.h"
+#include "xe_exec_queue.h"
+#include "xe_gt_printk.h"
+#include "xe_gt_types.h"
+#include "xe_map.h"
+#include "xe_sched_job.h"
+#include "instructions/xe_gsc_commands.h"
+#include "regs/xe_gsc_regs.h"
+
+#define GSC_HDR_SIZE (sizeof(struct intel_gsc_mtl_header)) /* shorthand define */
+
+#define mtl_gsc_header_wr(xe_, map_, offset_, field_, val_) \
+	xe_map_wr_field(xe_, map_, offset_, struct intel_gsc_mtl_header, field_, val_)
+
+#define mtl_gsc_header_rd(xe_, map_, offset_, field_) \
+	xe_map_rd_field(xe_, map_, offset_, struct intel_gsc_mtl_header, field_)
+
+/*
+ * GSC FW allows us to define the host_session_handle as we see fit, as long
+ * as we use unique identifier for each user, with handle 0 being reserved for
+ * kernel usage.
+ * To be able to differentiate which client subsystem owns the given session, we
+ * include the client id in the top 8 bits of the handle.
+ */
+#define HOST_SESSION_CLIENT_MASK GENMASK_ULL(63, 56)
+
+static struct xe_gt *
+gsc_to_gt(struct xe_gsc *gsc)
+{
+	return container_of(gsc, struct xe_gt, uc.gsc);
+}
+
+/**
+ * xe_gsc_emit_header - write the MTL GSC header in memory
+ * @xe: the Xe device
+ * @map: the iosys map to write to
+ * @offset: offset from the start of the map at which to write the header
+ * @heci_client_id: client id identifying the type of command (see abi for values)
+ * @host_session_id: host session ID of the caller
+ * @payload_size: size of the payload that follows the header
+ *
+ * Returns: offset memory location following the header
+ */
+u32 xe_gsc_emit_header(struct xe_device *xe, struct iosys_map *map, u32 offset,
+		       u8 heci_client_id, u64 host_session_id, u32 payload_size)
+{
+	xe_assert(xe, !(host_session_id & HOST_SESSION_CLIENT_MASK));
+
+	if (host_session_id)
+		host_session_id |= FIELD_PREP(HOST_SESSION_CLIENT_MASK, heci_client_id);
+
+	xe_map_memset(xe, map, offset, 0, GSC_HDR_SIZE);
+
+	mtl_gsc_header_wr(xe, map, offset, validity_marker, GSC_HECI_VALIDITY_MARKER);
+	mtl_gsc_header_wr(xe, map, offset, heci_client_id, heci_client_id);
+	mtl_gsc_header_wr(xe, map, offset, host_session_handle, host_session_id);
+	mtl_gsc_header_wr(xe, map, offset, header_version, MTL_GSC_HEADER_VERSION);
+	mtl_gsc_header_wr(xe, map, offset, message_size, payload_size + GSC_HDR_SIZE);
+
+	return offset + GSC_HDR_SIZE;
+};
+
+/**
+ * xe_gsc_check_and_update_pending - check the pending bit and update the input
+ * header with the retry handle from the output header
+ * @xe: the Xe device
+ * @in: the iosys map containing the input buffer
+ * @offset_in: offset within the iosys at which the input buffer is located
+ * @out: the iosys map containing the output buffer
+ * @offset_out: offset within the iosys at which the output buffer is located
+ *
+ * Returns: true if the pending bit was set, false otherwise
+ */
+bool xe_gsc_check_and_update_pending(struct xe_device *xe,
+				     struct iosys_map *in, u32 offset_in,
+				     struct iosys_map *out, u32 offset_out)
+{
+	if (mtl_gsc_header_rd(xe, out, offset_out, flags) & GSC_OUTFLAG_MSG_PENDING) {
+		u64 handle = mtl_gsc_header_rd(xe, out, offset_out, gsc_message_handle);
+
+		mtl_gsc_header_wr(xe, in, offset_in, gsc_message_handle, handle);
+
+		return true;
+	}
+
+	return false;
+}
+
+/**
+ * xe_gsc_read_out_header - reads and validates the output header and returns
+ * the offset of the reply following the header
+ * @xe: the Xe device
+ * @map: the iosys map containing the output buffer
+ * @offset: offset within the iosys at which the output buffer is located
+ * @min_payload_size: minimum size of the message excluding the gsc header
+ * @payload_offset: optional pointer to be set to the payload offset
+ *
+ * Returns: -errno value on failure, 0 otherwise
+ */
+int xe_gsc_read_out_header(struct xe_device *xe,
+			   struct iosys_map *map, u32 offset,
+			   u32 min_payload_size,
+			   u32 *payload_offset)
+{
+	u32 marker = mtl_gsc_header_rd(xe, map, offset, validity_marker);
+	u32 size = mtl_gsc_header_rd(xe, map, offset, message_size);
+	u32 payload_size = size - GSC_HDR_SIZE;
+
+	if (marker != GSC_HECI_VALIDITY_MARKER)
+		return -EPROTO;
+
+	if (size < GSC_HDR_SIZE || payload_size < min_payload_size)
+		return -ENODATA;
+
+	if (payload_offset)
+		*payload_offset = offset + GSC_HDR_SIZE;
+
+	return 0;
+}
+
+/**
+ * xe_gsc_pkt_submit_kernel - submit a kernel heci pkt to the GSC
+ * @gsc: the GSC uC
+ * @addr_in: GGTT address of the message to send to the GSC
+ * @size_in: size of the message to send to the GSC
+ * @addr_out: GGTT address for the GSC to write the reply to
+ * @size_out: size of the memory reserved for the reply
+ */
+int xe_gsc_pkt_submit_kernel(struct xe_gsc *gsc, u64 addr_in, u32 size_in,
+			     u64 addr_out, u32 size_out)
+{
+	struct xe_gt *gt = gsc_to_gt(gsc);
+	struct xe_bb *bb;
+	struct xe_sched_job *job;
+	struct dma_fence *fence;
+	long timeout;
+
+	if (size_in < GSC_HDR_SIZE)
+		return -ENODATA;
+
+	if (size_out < GSC_HDR_SIZE)
+		return -ENOMEM;
+
+	bb = xe_bb_new(gt, 8, false);
+	if (IS_ERR(bb))
+		return PTR_ERR(bb);
+
+	bb->cs[bb->len++] = GSC_HECI_CMD_PKT;
+	bb->cs[bb->len++] = lower_32_bits(addr_in);
+	bb->cs[bb->len++] = upper_32_bits(addr_in);
+	bb->cs[bb->len++] = size_in;
+	bb->cs[bb->len++] = lower_32_bits(addr_out);
+	bb->cs[bb->len++] = upper_32_bits(addr_out);
+	bb->cs[bb->len++] = size_out;
+	bb->cs[bb->len++] = 0;
+
+	job = xe_bb_create_job(gsc->q, bb);
+	if (IS_ERR(job)) {
+		xe_bb_free(bb, NULL);
+		return PTR_ERR(job);
+	}
+
+	xe_sched_job_arm(job);
+	fence = dma_fence_get(&job->drm.s_fence->finished);
+	xe_sched_job_push(job);
+
+	timeout = dma_fence_wait_timeout(fence, false, HZ);
+	dma_fence_put(fence);
+	xe_bb_free(bb, NULL);
+	if (timeout < 0)
+		return timeout;
+	else if (!timeout)
+		return -ETIME;
+
+	return 0;
+}