1 files changed, 438 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/xe_gsc.c b/drivers/gpu/drm/xe/xe_gsc.c
new file mode 100644
index 000000000000..a8a895cf4b44
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_gsc.c
@@ -0,0 +1,438 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2023 Intel Corporation
+ */
+
+#include "xe_gsc.h"
+
+#include <drm/drm_managed.h>
+
+#include "abi/gsc_mkhi_commands_abi.h"
+#include "generated/xe_wa_oob.h"
+#include "xe_bb.h"
+#include "xe_bo.h"
+#include "xe_device.h"
+#include "xe_exec_queue.h"
+#include "xe_gsc_submit.h"
+#include "xe_gt.h"
+#include "xe_gt_printk.h"
+#include "xe_huc.h"
+#include "xe_map.h"
+#include "xe_mmio.h"
+#include "xe_sched_job.h"
+#include "xe_uc_fw.h"
+#include "xe_wa.h"
+#include "instructions/xe_gsc_commands.h"
+#include "regs/xe_gsc_regs.h"
+
+static struct xe_gt *
+gsc_to_gt(struct xe_gsc *gsc)
+{
+	return container_of(gsc, struct xe_gt, uc.gsc);
+}
+
+static int memcpy_fw(struct xe_gsc *gsc)
+{
+	struct xe_gt *gt = gsc_to_gt(gsc);
+	struct xe_device *xe = gt_to_xe(gt);
+	u32 fw_size = gsc->fw.size;
+	void *storage;
+
+	/*
+	 * FIXME: xe_migrate_copy does not work with stolen mem yet, so we use
+	 * a memcpy for now.
+	 */
+	storage = kmalloc(fw_size, GFP_KERNEL);
+	if (!storage)
+		return -ENOMEM;
+
+	xe_map_memcpy_from(xe, storage, &gsc->fw.bo->vmap, 0, fw_size);
+	xe_map_memcpy_to(xe, &gsc->private->vmap, 0, storage, fw_size);
+	xe_map_memset(xe, &gsc->private->vmap, fw_size, 0, gsc->private->size - fw_size);
+
+	kfree(storage);
+
+	return 0;
+}
+
+static int emit_gsc_upload(struct xe_gsc *gsc)
+{
+	struct xe_gt *gt = gsc_to_gt(gsc);
+	u64 offset = xe_bo_ggtt_addr(gsc->private);
+	struct xe_bb *bb;
+	struct xe_sched_job *job;
+	struct dma_fence *fence;
+	long timeout;
+
+	bb = xe_bb_new(gt, 4, false);
+	if (IS_ERR(bb))
+		return PTR_ERR(bb);
+
+	bb->cs[bb->len++] = GSC_FW_LOAD;
+	bb->cs[bb->len++] = lower_32_bits(offset);
+	bb->cs[bb->len++] = upper_32_bits(offset);
+	bb->cs[bb->len++] = (gsc->private->size / SZ_4K) | GSC_FW_LOAD_LIMIT_VALID;
+
+	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;
+}
+
+#define version_query_wr(xe_, map_, offset_, field_, val_) \
+	xe_map_wr_field(xe_, map_, offset_, struct gsc_get_compatibility_version_in, field_, val_)
+#define version_query_rd(xe_, map_, offset_, field_) \
+	xe_map_rd_field(xe_, map_, offset_, struct gsc_get_compatibility_version_out, field_)
+
+static u32 emit_version_query_msg(struct xe_device *xe, struct iosys_map *map, u32 wr_offset)
+{
+	xe_map_memset(xe, map, wr_offset, 0, sizeof(struct gsc_get_compatibility_version_in));
+
+	version_query_wr(xe, map, wr_offset, header.group_id, MKHI_GROUP_ID_GFX_SRV);
+	version_query_wr(xe, map, wr_offset, header.command,
+			 MKHI_GFX_SRV_GET_HOST_COMPATIBILITY_VERSION);
+
+	return wr_offset + sizeof(struct gsc_get_compatibility_version_in);
+}
+
+#define GSC_VER_PKT_SZ SZ_4K /* 4K each for input and output */
+static int query_compatibility_version(struct xe_gsc *gsc)
+{
+	struct xe_uc_fw_version *compat = &gsc->fw.versions.found[XE_UC_FW_VER_COMPATIBILITY];
+	struct xe_gt *gt = gsc_to_gt(gsc);
+	struct xe_tile *tile = gt_to_tile(gt);
+	struct xe_device *xe = gt_to_xe(gt);
+	struct xe_bo *bo;
+	u32 wr_offset;
+	u32 rd_offset;
+	u64 ggtt_offset;
+	int err;
+
+	bo = xe_bo_create_pin_map(xe, tile, NULL, GSC_VER_PKT_SZ * 2,
+				  ttm_bo_type_kernel,
+				  XE_BO_CREATE_SYSTEM_BIT |
+				  XE_BO_CREATE_GGTT_BIT);
+	if (IS_ERR(bo)) {
+		xe_gt_err(gt, "failed to allocate bo for GSC version query\n");
+		return PTR_ERR(bo);
+	}
+
+	ggtt_offset = xe_bo_ggtt_addr(bo);
+
+	wr_offset = xe_gsc_emit_header(xe, &bo->vmap, 0, HECI_MEADDRESS_MKHI, 0,
+				       sizeof(struct gsc_get_compatibility_version_in));
+	wr_offset = emit_version_query_msg(xe, &bo->vmap, wr_offset);
+
+	err = xe_gsc_pkt_submit_kernel(gsc, ggtt_offset, wr_offset,
+				       ggtt_offset + GSC_VER_PKT_SZ,
+				       GSC_VER_PKT_SZ);
+	if (err) {
+		xe_gt_err(gt,
+			  "failed to submit GSC request for compatibility version: %d\n",
+			  err);
+		goto out_bo;
+	}
+
+	err = xe_gsc_read_out_header(xe, &bo->vmap, GSC_VER_PKT_SZ,
+				     sizeof(struct gsc_get_compatibility_version_out),
+				     &rd_offset);
+	if (err) {
+		xe_gt_err(gt, "HuC: invalid GSC reply for version query (err=%d)\n", err);
+		return err;
+	}
+
+	compat->major = version_query_rd(xe, &bo->vmap, rd_offset, compat_major);
+	compat->minor = version_query_rd(xe, &bo->vmap, rd_offset, compat_minor);
+
+	xe_gt_info(gt, "found GSC cv%u.%u\n", compat->major, compat->minor);
+
+out_bo:
+	xe_bo_unpin_map_no_vm(bo);
+	return err;
+}
+
+static int gsc_fw_is_loaded(struct xe_gt *gt)
+{
+	return xe_mmio_read32(gt, HECI_FWSTS1(MTL_GSC_HECI1_BASE)) &
+			      HECI1_FWSTS1_INIT_COMPLETE;
+}
+
+static int gsc_fw_wait(struct xe_gt *gt)
+{
+	/*
+	 * GSC load can take up to 250ms from the moment the instruction is
+	 * executed by the GSCCS. To account for possible submission delays or
+	 * other issues, we use a 500ms timeout in the wait here.
+	 */
+	return xe_mmio_wait32(gt, HECI_FWSTS1(MTL_GSC_HECI1_BASE),
+			      HECI1_FWSTS1_INIT_COMPLETE,
+			      HECI1_FWSTS1_INIT_COMPLETE,
+			      500 * USEC_PER_MSEC, NULL, false);
+}
+
+static int gsc_upload(struct xe_gsc *gsc)
+{
+	struct xe_gt *gt = gsc_to_gt(gsc);
+	struct xe_device *xe = gt_to_xe(gt);
+	int err;
+
+	/* we should only be here if the init step were successful */
+	xe_assert(xe, xe_uc_fw_is_loadable(&gsc->fw) && gsc->q);
+
+	if (gsc_fw_is_loaded(gt)) {
+		xe_gt_err(gt, "GSC already loaded at upload time\n");
+		return -EEXIST;
+	}
+
+	err = memcpy_fw(gsc);
+	if (err) {
+		xe_gt_err(gt, "Failed to memcpy GSC FW\n");
+		return err;
+	}
+
+	/*
+	 * GSC is only killed by an FLR, so we need to trigger one on unload to
+	 * make sure we stop it. This is because we assign a chunk of memory to
+	 * the GSC as part of the FW load, so we need to make sure it stops
+	 * using it when we release it to the system on driver unload. Note that
+	 * this is not a problem of the unload per-se, because the GSC will not
+	 * touch that memory unless there are requests for it coming from the
+	 * driver; therefore, no accesses will happen while Xe is not loaded,
+	 * but if we re-load the driver then the GSC might wake up and try to
+	 * access that old memory location again.
+	 * Given that an FLR is a very disruptive action (see the FLR function
+	 * for details), we want to do it as the last action before releasing
+	 * the access to the MMIO bar, which means we need to do it as part of
+	 * mmio cleanup.
+	 */
+	xe->needs_flr_on_fini = true;
+
+	err = emit_gsc_upload(gsc);
+	if (err) {
+		xe_gt_err(gt, "Failed to emit GSC FW upload (%pe)\n", ERR_PTR(err));
+		return err;
+	}
+
+	err = gsc_fw_wait(gt);
+	if (err) {
+		xe_gt_err(gt, "Failed to wait for GSC load (%pe)\n", ERR_PTR(err));
+		return err;
+	}
+
+	err = query_compatibility_version(gsc);
+	if (err)
+		return err;
+
+	err = xe_uc_fw_check_version_requirements(&gsc->fw);
+	if (err)
+		return err;
+
+	xe_gt_dbg(gt, "GSC FW async load completed\n");
+
+	return 0;
+}
+
+static void gsc_work(struct work_struct *work)
+{
+	struct xe_gsc *gsc = container_of(work, typeof(*gsc), work);
+	struct xe_gt *gt = gsc_to_gt(gsc);
+	struct xe_device *xe = gt_to_xe(gt);
+	int ret;
+
+	xe_device_mem_access_get(xe);
+	xe_force_wake_get(gt_to_fw(gt), XE_FW_GSC);
+
+	ret = gsc_upload(gsc);
+	if (ret && ret != -EEXIST) {
+		xe_uc_fw_change_status(&gsc->fw, XE_UC_FIRMWARE_LOAD_FAIL);
+		goto out;
+	}
+
+	xe_uc_fw_change_status(&gsc->fw, XE_UC_FIRMWARE_TRANSFERRED);
+
+	/* HuC auth failure is not fatal */
+	if (xe_huc_is_authenticated(&gt->uc.huc, XE_HUC_AUTH_VIA_GUC))
+		xe_huc_auth(&gt->uc.huc, XE_HUC_AUTH_VIA_GSC);
+
+out:
+	xe_force_wake_put(gt_to_fw(gt), XE_FW_GSC);
+	xe_device_mem_access_put(xe);
+}
+
+int xe_gsc_init(struct xe_gsc *gsc)
+{
+	struct xe_gt *gt = gsc_to_gt(gsc);
+	struct xe_tile *tile = gt_to_tile(gt);
+	int ret;
+
+	gsc->fw.type = XE_UC_FW_TYPE_GSC;
+	INIT_WORK(&gsc->work, gsc_work);
+
+	/* The GSC uC is only available on the media GT */
+	if (tile->media_gt && (gt != tile->media_gt)) {
+		xe_uc_fw_change_status(&gsc->fw, XE_UC_FIRMWARE_NOT_SUPPORTED);
+		return 0;
+	}
+
+	/*
+	 * Some platforms can have GuC but not GSC. That would cause
+	 * xe_uc_fw_init(gsc) to return a "not supported" failure code and abort
+	 * all firmware loading. So check for GSC being enabled before
+	 * propagating the failure back up. That way the higher level will keep
+	 * going and load GuC as appropriate.
+	 */
+	ret = xe_uc_fw_init(&gsc->fw);
+	if (!xe_uc_fw_is_enabled(&gsc->fw))
+		return 0;
+	else if (ret)
+		goto out;
+
+	return 0;
+
+out:
+	xe_gt_err(gt, "GSC init failed with %d", ret);
+	return ret;
+}
+
+static void free_resources(struct drm_device *drm, void *arg)
+{
+	struct xe_gsc *gsc = arg;
+
+	if (gsc->wq) {
+		destroy_workqueue(gsc->wq);
+		gsc->wq = NULL;
+	}
+
+	if (gsc->q) {
+		xe_exec_queue_put(gsc->q);
+		gsc->q = NULL;
+	}
+
+	if (gsc->private) {
+		xe_bo_unpin_map_no_vm(gsc->private);
+		gsc->private = NULL;
+	}
+}
+
+int xe_gsc_init_post_hwconfig(struct xe_gsc *gsc)
+{
+	struct xe_gt *gt = gsc_to_gt(gsc);
+	struct xe_tile *tile = gt_to_tile(gt);
+	struct xe_device *xe = gt_to_xe(gt);
+	struct xe_hw_engine *hwe = xe_gt_hw_engine(gt, XE_ENGINE_CLASS_OTHER, 0, true);
+	struct xe_exec_queue *q;
+	struct workqueue_struct *wq;
+	struct xe_bo *bo;
+	int err;
+
+	if (!xe_uc_fw_is_available(&gsc->fw))
+		return 0;
+
+	if (!hwe)
+		return -ENODEV;
+
+	bo = xe_bo_create_pin_map(xe, tile, NULL, SZ_4M,
+				  ttm_bo_type_kernel,
+				  XE_BO_CREATE_STOLEN_BIT |
+				  XE_BO_CREATE_GGTT_BIT);
+	if (IS_ERR(bo))
+		return PTR_ERR(bo);
+
+	q = xe_exec_queue_create(xe, NULL,
+				 BIT(hwe->logical_instance), 1, hwe,
+				 EXEC_QUEUE_FLAG_KERNEL |
+				 EXEC_QUEUE_FLAG_PERMANENT);
+	if (IS_ERR(q)) {
+		xe_gt_err(gt, "Failed to create queue for GSC submission\n");
+		err = PTR_ERR(q);
+		goto out_bo;
+	}
+
+	wq = alloc_ordered_workqueue("gsc-ordered-wq", 0);
+	if (!wq) {
+		err = -ENOMEM;
+		goto out_q;
+	}
+
+	gsc->private = bo;
+	gsc->q = q;
+	gsc->wq = wq;
+
+	err = drmm_add_action_or_reset(&xe->drm, free_resources, gsc);
+	if (err)
+		return err;
+
+	xe_uc_fw_change_status(&gsc->fw, XE_UC_FIRMWARE_LOADABLE);
+
+	return 0;
+
+out_q:
+	xe_exec_queue_put(q);
+out_bo:
+	xe_bo_unpin_map_no_vm(bo);
+	return err;
+}
+
+void xe_gsc_load_start(struct xe_gsc *gsc)
+{
+	struct xe_gt *gt = gsc_to_gt(gsc);
+
+	if (!xe_uc_fw_is_loadable(&gsc->fw) || !gsc->q)
+		return;
+
+	/* GSC FW survives GT reset and D3Hot */
+	if (gsc_fw_is_loaded(gt)) {
+		xe_uc_fw_change_status(&gsc->fw, XE_UC_FIRMWARE_TRANSFERRED);
+		return;
+	}
+
+	queue_work(gsc->wq, &gsc->work);
+}
+
+void xe_gsc_wait_for_worker_completion(struct xe_gsc *gsc)
+{
+	if (xe_uc_fw_is_loadable(&gsc->fw) && gsc->wq)
+		flush_work(&gsc->work);
+}
+
+/*
+ * wa_14015076503: if the GSC FW is loaded, we need to alert it before doing a
+ * GSC engine reset by writing a notification bit in the GS1 register and then
+ * triggering an interrupt to GSC; from the interrupt it will take up to 200ms
+ * for the FW to get prepare for the reset, so we need to wait for that amount
+ * of time.
+ * After the reset is complete we need to then clear the GS1 register.
+ */
+void xe_gsc_wa_14015076503(struct xe_gt *gt, bool prep)
+{
+	u32 gs1_set = prep ? HECI_H_GS1_ER_PREP : 0;
+	u32 gs1_clr = prep ? 0 : HECI_H_GS1_ER_PREP;
+
+	/* WA only applies if the GSC is loaded */
+	if (!XE_WA(gt, 14015076503) || !gsc_fw_is_loaded(gt))
+		return;
+
+	xe_mmio_rmw32(gt, HECI_H_GS1(MTL_GSC_HECI2_BASE), gs1_clr, gs1_set);
+
+	if (prep) {
+		/* make sure the reset bit is clear when writing the CSR reg */
+		xe_mmio_rmw32(gt, HECI_H_CSR(MTL_GSC_HECI2_BASE),
+			      HECI_H_CSR_RST, HECI_H_CSR_IG);
+		msleep(200);
+	}
+}