[PATCH v2 4/9] drm/i915/pxp: Add MTL helpers to submit Heci-Cmd-Packet to GSC
Alan Previn
alan.previn.teres.alexis at intel.com
Wed Jan 11 21:42:21 UTC 2023
Add helper functions into (new) common heci-packet-submission files
to handle generating the MTL GSC-CS Memory-Header and emitting of
the Heci-Cmd-Packet instructions that gets submitted to the engine.
NOTE1: This common functions for heci-packet-submission will be used by
different i915 callers:
1- GSC-SW-Proxy: This is pending upstream publication awaiting
a few remaining opens
2- MTL-HDCP: An equivalent patch has also been published at:
https://patchwork.freedesktop.org/series/111876/. (Patch 1)
3- PXP: This series.
NOTE2: A difference in this patch vs what is appearing is in bullet 2
above is that HDCP (and SW-Proxy) will be using priveleged submission
(GGTT and common gsc-uc-context) while PXP will be using non-priveleged
PPGTT, context and batch buffer. Therefore this patch will only slightly
overlap with the MTL-HDCP patches despite have very similar function
names (emit_foo vs emit_nonpriv_foo). This is because HECI_CMD_PKT
instructions require very different flows and hw-specific code when done
via PPGTT based submission (not different from other engines). MTL-HDCP
contains the same intel_gsc_mtl_header_t structures as this but the
helpers there are different. Both add the same new file names.
NOTE3: Additional clarity about the heci-cmd-pkt layout and where the
common helpers come in:
- When an internal subsystem needs to send a command request
to the security firmware on MTL onwards, it will send that
via the GSC-engine-command-streamer.
- However those commands, (lets call them "gsc_specific_fw_api"
calls), are not understood by the GSC command streamer hw.
- The command streamer DOES understand GSC_HECI_CMD_PKT but
requires an additional header before the "gsc_specific_fw_api"
is sent by the hw engine to the firmware (with additional
metadata).
- Thus, the structural layout of the request submitted would
need to look like the diagram below (for non-priv PXP).
- In the diagram, the common helper for HDCP, (GSC-Sw-Proxy) and
PXP (i.e. new function intel_gsc_uc_heci_cmd_emit_mtl_header)
will populate blob (C) while additional helpers different for
GGTT (not in this series) vs PPGTT (this patch) will populate
blobs (A) and (B) below.
___________________________________________________________
(A) | MI_BATCH_BUFFER_START (ppgtt, batchbuff-addr, ...) |
| | |
| _|________________________________________________ |
| (B)| GSC_HECI_CMD_PKT (pkt-addr-in, pkt-size-in, | |
| | pkt-addr-out, pkt-size-out) |--------
| | MI_BATCH_BUFFER_END | | |
| |________________________________________________| | |
| | |
|_________________________________________________________| |
|
---------------------------------------------------------
|
\|/
______V___________________________________________
| _________________________________________ |
|(C)| | |
| | struct intel_gsc_mtl_header { | |
| | validity marker | |
| | heci_clent_id | |
| | ... | |
| | } | |
| |_______________________________________| |
|(D)| | |
| | struct gsc_fw_specific_api_foobar { | |
| | ... | |
| | For an example, see | |
| | 'struct pxp43_create_arb_in' at | |
| | intel_pxp_cmd_interface_43.h | |
| | | |
| | } | |
| | Struture depends on command type | |
| | struct gsc_fw_specific_api_foobar { | |
| |_______________________________________| |
|________________________________________________|
That said, this patch provides basic helpers but leaves the
PXP subsystem (i.e. the caller) to handle everything else from
input/output packet size verification to handling the
responses from security firmware (such as requiring a retry).
Signed-off-by: Alan Previn <alan.previn.teres.alexis at intel.com>
---
drivers/gpu/drm/i915/Makefile | 1 +
drivers/gpu/drm/i915/gt/intel_gpu_commands.h | 2 +
.../i915/gt/uc/intel_gsc_uc_heci_cmd_submit.c | 107 ++++++++++++++++++
.../i915/gt/uc/intel_gsc_uc_heci_cmd_submit.h | 69 +++++++++++
4 files changed, 179 insertions(+)
create mode 100644 drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_heci_cmd_submit.c
create mode 100644 drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_heci_cmd_submit.h
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index eae4325310e8..7dc18554da10 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -194,6 +194,7 @@ i915-y += \
i915-y += \
gt/uc/intel_gsc_fw.o \
gt/uc/intel_gsc_uc.o \
+ gt/uc/intel_gsc_uc_heci_cmd_submit.o \
gt/uc/intel_guc.o \
gt/uc/intel_guc_ads.o \
gt/uc/intel_guc_capture.o \
diff --git a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
index 2af1ae3831df..454179884801 100644
--- a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
+++ b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
@@ -439,6 +439,8 @@
#define GSC_FW_LOAD GSC_INSTR(1, 0, 2)
#define HECI1_FW_LIMIT_VALID (1 << 31)
+#define GSC_HECI_CMD_PKT GSC_INSTR(0, 0, 6)
+
/*
* Used to convert any address to canonical form.
* Starting from gen8, some commands (e.g. STATE_BASE_ADDRESS,
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_heci_cmd_submit.c b/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_heci_cmd_submit.c
new file mode 100644
index 000000000000..01bb7e587b1b
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_heci_cmd_submit.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#include <linux/types.h>
+
+#include "i915_drv.h"
+#include "i915_vma.h"
+
+#include "gt/intel_gpu_commands.h"
+#include "gt/intel_context.h"
+#include "gt/intel_gt.h"
+#include "gt/intel_ring.h"
+
+#include "intel_gsc_fw.h"
+#include "intel_gsc_uc.h"
+#include "intel_gsc_uc_heci_cmd_submit.h"
+
+void intel_gsc_uc_heci_cmd_emit_mtl_header(struct intel_gsc_mtl_header *header,
+ u8 heci_client_id, u32 message_size,
+ u64 host_session_id)
+{
+ host_session_id &= ~GSC_HECI_HOST_SESSION_USAGE_MASK;
+ if (heci_client_id == GSC_HECI_MEADDRESS_PXP)
+ host_session_id |= GSC_HECI_SESSION_PXP_SINGLE;
+
+ header->validity_marker = GSC_HECI_VALIDITY_MARKER;
+ header->heci_client_id = heci_client_id;
+ header->host_session_handle = host_session_id;
+ header->header_version = MTL_GSC_HECI_HEADER_VERSION;
+ header->message_size = message_size;
+}
+
+static void
+emit_gsc_heci_pkt_nonpriv(u32 *cs, struct intel_gsc_heci_non_priv_pkt *pkt)
+{
+ *cs++ = GSC_HECI_CMD_PKT;
+ *cs++ = lower_32_bits(pkt->addr_in);
+ *cs++ = upper_32_bits(pkt->addr_in);
+ *cs++ = pkt->size_in;
+ *cs++ = lower_32_bits(pkt->addr_out);
+ *cs++ = upper_32_bits(pkt->addr_out);
+ *cs++ = pkt->size_out;
+ *cs++ = 0;
+ *cs++ = MI_BATCH_BUFFER_END;
+}
+
+int
+intel_gsc_uc_heci_cmd_submit_nonpriv(struct intel_gsc_uc *gsc,
+ struct intel_context *ce,
+ struct intel_gsc_heci_non_priv_pkt *pkt,
+ u32 *cs, int timeout_ms)
+{
+ struct intel_engine_cs *eng;
+ struct i915_request *rq;
+ int err;
+
+ rq = intel_context_create_request(ce);
+ if (IS_ERR(rq))
+ return PTR_ERR(rq);
+
+ emit_gsc_heci_pkt_nonpriv(cs, pkt);
+
+ i915_vma_lock(pkt->bb_vma);
+ err = i915_vma_move_to_active(pkt->bb_vma, rq, EXEC_OBJECT_WRITE);
+ i915_vma_unlock(pkt->bb_vma);
+
+ if (!err) {
+ i915_vma_lock(pkt->heci_pkt_vma);
+ err = i915_vma_move_to_active(pkt->heci_pkt_vma, rq, EXEC_OBJECT_WRITE);
+ i915_vma_unlock(pkt->heci_pkt_vma);
+ }
+
+ eng = rq->context->engine;
+ if (!err && eng->emit_init_breadcrumb)
+ err = eng->emit_init_breadcrumb(rq);
+
+ if (!err)
+ err = eng->emit_bb_start(rq, i915_vma_offset(pkt->bb_vma), PAGE_SIZE, 0);
+
+ if (err) {
+ i915_request_add(rq);
+ return err;
+ }
+
+ i915_request_get(rq);
+
+ i915_request_add(rq);
+ if (i915_request_wait(rq, I915_WAIT_INTERRUPTIBLE,
+ msecs_to_jiffies(timeout_ms)) < 0) {
+ i915_request_put(rq);
+ return -ETIME;
+ }
+
+ i915_request_put(rq);
+
+ err = ce->engine->emit_flush(rq, 0);
+ if (err)
+ drm_err(&gsc_uc_to_gt(gsc)->i915->drm,
+ "Failed emit-flush for gsc-heci-non-priv-pkterr=%d\n", err);
+
+ if (unlikely(err))
+ i915_request_set_error_once(rq, err);
+
+ return err;
+}
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_heci_cmd_submit.h b/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_heci_cmd_submit.h
new file mode 100644
index 000000000000..23155bed3fee
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_heci_cmd_submit.h
@@ -0,0 +1,69 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#ifndef _INTEL_GSC_UC_HECI_CMD_H_
+#define _INTEL_GSC_UC_HECI_CMD_H_
+
+#include <linux/types.h>
+
+struct i915_vma;
+struct intel_context;
+struct intel_gsc_uc;
+
+struct intel_gsc_mtl_header {
+ u32 validity_marker;
+#define GSC_HECI_VALIDITY_MARKER 0xA578875A
+
+ u8 heci_client_id;
+#define GSC_HECI_MEADDRESS_PXP 17
+#define GSC_HECI_MEADDRESS_HDCP 18
+
+ u8 reserved1;
+
+ u16 header_version;
+#define MTL_GSC_HECI_HEADER_VERSION 1
+
+ u64 host_session_handle;
+#define GSC_HECI_HOST_SESSION_USAGE_MASK REG_GENMASK64(63, 60)
+#define GSC_HECI_SESSION_PXP_SINGLE BIT_ULL(60)
+
+ u64 gsc_message_handle;
+
+ u32 message_size; /* lower 20 bits only, upper 12 are reserved */
+
+ /*
+ * Flags mask:
+ * Bit 0: Pending
+ * Bit 1: Session Cleanup;
+ * Bits 2-15: Flags
+ * Bits 16-31: Extension Size
+ */
+ u32 flags;
+#define GSC_HECI_FLAG_MSG_PENDING BIT(0)
+#define GSC_HECI_FLAG_MSG_CLEANUP BIT(1)
+
+ u32 status;
+} __packed;
+
+struct intel_gsc_heci_non_priv_pkt {
+ u64 addr_in;
+ u32 size_in;
+ u64 addr_out;
+ u32 size_out;
+ struct i915_vma *heci_pkt_vma;
+ struct i915_vma *bb_vma;
+};
+
+void
+intel_gsc_uc_heci_cmd_emit_mtl_header(struct intel_gsc_mtl_header *header,
+ u8 heci_client_id, u32 msg_size,
+ u64 host_session_id);
+
+int
+intel_gsc_uc_heci_cmd_submit_nonpriv(struct intel_gsc_uc *gsc,
+ struct intel_context *ce,
+ struct intel_gsc_heci_non_priv_pkt *pkt,
+ u32 *cs, int timeout_ms);
+#endif
--
2.39.0
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