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drm/i915/pxp: Add MTL helpers to submit Heci-Cmd-Packet to GSC
Add helper functions into a new file for heci-packet-submission. The helpers will handle generating the MTL GSC-CS Memory-Header and submission of the Heci-Cmd-Packet instructions to the engine. NOTE1: These 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 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: - On MTL, when an i915 subsystem needs to send a command request to the security firmware, 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 GSC CS only looks at the GSC_HECI_CMD_PKT instruction and passes it along to the GSC firmware. - The GSC FW on the other hand needs additional metadata to know which usage service is being called (PXP, HDCP, proxy, etc) along with session specific info. Thus an extra header called GSC-CS HECI Memory Header, (C) in below diagram is prepended before the FW specific API, (D). - 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 PPGGTT (this patch) vs GGTT (HDCP series) 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 (D) and everything else such as input/output size verification or handling the responses from security firmware (for example, requiring a retry). Signed-off-by: Alan Previn <alan.previn.teres.alexis@intel.com> Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230511231738.1077674-4-alan.previn.teres.alexis@intel.com
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2 changed files with 125 additions and 0 deletions
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@ -3,6 +3,7 @@
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* Copyright © 2023 Intel Corporation
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*/
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#include "gt/intel_context.h"
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#include "gt/intel_engine_pm.h"
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#include "gt/intel_gpu_commands.h"
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#include "gt/intel_gt.h"
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@ -107,3 +108,104 @@ void intel_gsc_uc_heci_cmd_emit_mtl_header(struct intel_gsc_mtl_header *header,
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header->header_version = MTL_GSC_HEADER_VERSION;
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header->message_size = message_size;
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}
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static void
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emit_gsc_heci_pkt_nonpriv(u32 *cmd, struct intel_gsc_heci_non_priv_pkt *pkt)
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{
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*cmd++ = GSC_HECI_CMD_PKT;
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*cmd++ = lower_32_bits(pkt->addr_in);
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*cmd++ = upper_32_bits(pkt->addr_in);
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*cmd++ = pkt->size_in;
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*cmd++ = lower_32_bits(pkt->addr_out);
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*cmd++ = upper_32_bits(pkt->addr_out);
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*cmd++ = pkt->size_out;
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*cmd++ = 0;
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*cmd++ = MI_BATCH_BUFFER_END;
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}
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int
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intel_gsc_uc_heci_cmd_submit_nonpriv(struct intel_gsc_uc *gsc,
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struct intel_context *ce,
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struct intel_gsc_heci_non_priv_pkt *pkt,
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u32 *cmd, int timeout_ms)
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{
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struct intel_engine_cs *engine;
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struct i915_gem_ww_ctx ww;
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struct i915_request *rq;
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int err, trials = 0;
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i915_gem_ww_ctx_init(&ww, false);
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retry:
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err = i915_gem_object_lock(pkt->bb_vma->obj, &ww);
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if (err)
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goto out_ww;
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err = i915_gem_object_lock(pkt->heci_pkt_vma->obj, &ww);
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if (err)
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goto out_ww;
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err = intel_context_pin_ww(ce, &ww);
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if (err)
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goto out_ww;
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rq = i915_request_create(ce);
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if (IS_ERR(rq)) {
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err = PTR_ERR(rq);
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goto out_unpin_ce;
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}
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emit_gsc_heci_pkt_nonpriv(cmd, pkt);
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err = i915_vma_move_to_active(pkt->bb_vma, rq, 0);
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if (err)
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goto out_rq;
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err = i915_vma_move_to_active(pkt->heci_pkt_vma, rq, EXEC_OBJECT_WRITE);
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if (err)
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goto out_rq;
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engine = rq->context->engine;
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if (engine->emit_init_breadcrumb) {
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err = engine->emit_init_breadcrumb(rq);
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if (err)
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goto out_rq;
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}
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err = engine->emit_bb_start(rq, i915_vma_offset(pkt->bb_vma), PAGE_SIZE, 0);
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if (err)
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goto out_rq;
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err = ce->engine->emit_flush(rq, 0);
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if (err)
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drm_err(&gsc_uc_to_gt(gsc)->i915->drm,
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"Failed emit-flush for gsc-heci-non-priv-pkterr=%d\n", err);
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out_rq:
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i915_request_get(rq);
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if (unlikely(err))
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i915_request_set_error_once(rq, err);
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i915_request_add(rq);
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if (!err) {
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if (i915_request_wait(rq, I915_WAIT_INTERRUPTIBLE,
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msecs_to_jiffies(timeout_ms)) < 0)
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err = -ETIME;
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}
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i915_request_put(rq);
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out_unpin_ce:
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intel_context_unpin(ce);
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out_ww:
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if (err == -EDEADLK) {
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err = i915_gem_ww_ctx_backoff(&ww);
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if (!err) {
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if (++trials < 10)
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goto retry;
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else
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err = EAGAIN;
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}
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}
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i915_gem_ww_ctx_fini(&ww);
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return err;
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}
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@ -8,7 +8,10 @@
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#include <linux/types.h>
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struct i915_vma;
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struct intel_context;
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struct intel_gsc_uc;
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struct intel_gsc_mtl_header {
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u32 validity_marker;
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#define GSC_HECI_VALIDITY_MARKER 0xA578875A
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@ -59,4 +62,24 @@ int intel_gsc_uc_heci_cmd_submit_packet(struct intel_gsc_uc *gsc,
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void intel_gsc_uc_heci_cmd_emit_mtl_header(struct intel_gsc_mtl_header *header,
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u8 heci_client_id, u32 message_size,
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u64 host_session_id);
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struct intel_gsc_heci_non_priv_pkt {
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u64 addr_in;
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u32 size_in;
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u64 addr_out;
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u32 size_out;
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struct i915_vma *heci_pkt_vma;
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struct i915_vma *bb_vma;
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};
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void
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intel_gsc_uc_heci_cmd_emit_mtl_header(struct intel_gsc_mtl_header *header,
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u8 heci_client_id, u32 msg_size,
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u64 host_session_id);
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int
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intel_gsc_uc_heci_cmd_submit_nonpriv(struct intel_gsc_uc *gsc,
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struct intel_context *ce,
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struct intel_gsc_heci_non_priv_pkt *pkt,
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u32 *cs, int timeout_ms);
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#endif
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