7 files changed, 141 insertions, 44 deletions
diff --git a/drivers/accel/ivpu/ivpu_drv.c b/drivers/accel/ivpu/ivpu_drv.c
index 3289751b475733..a08f99c3ba4adc 100644
--- a/drivers/accel/ivpu/ivpu_drv.c
+++ b/drivers/accel/ivpu/ivpu_drv.c
@@ -200,6 +200,9 @@ static int ivpu_get_param_ioctl(struct drm_device *dev, void *data, struct drm_f
 	case DRM_IVPU_PARAM_CAPABILITIES:
 		args->value = ivpu_is_capable(vdev, args->index);
 		break;
+	case DRM_IVPU_PARAM_PREEMPT_BUFFER_SIZE:
+		args->value = ivpu_fw_preempt_buf_size(vdev);
+		break;
 	default:
 		ret = -EINVAL;
 		break;
diff --git a/drivers/accel/ivpu/ivpu_fw.c b/drivers/accel/ivpu/ivpu_fw.c
index df9631fef05864..32f51349982988 100644
--- a/drivers/accel/ivpu/ivpu_fw.c
+++ b/drivers/accel/ivpu/ivpu_fw.c
@@ -26,6 +26,8 @@
 #define FW_RUNTIME_MIN_ADDR	(FW_GLOBAL_MEM_START)
 #define FW_RUNTIME_MAX_ADDR	(FW_GLOBAL_MEM_END - FW_SHARED_MEM_SIZE)
 #define FW_FILE_IMAGE_OFFSET	(VPU_FW_HEADER_SIZE + FW_VERSION_HEADER_SIZE)
+#define FW_PREEMPT_BUF_MIN_SIZE SZ_4K
+#define FW_PREEMPT_BUF_MAX_SIZE SZ_32M
 
 #define WATCHDOG_MSS_REDIRECT	32
 #define WATCHDOG_NCE_REDIRECT	33
@@ -151,6 +153,47 @@ ivpu_fw_sched_mode_select(struct ivpu_device *vdev, const struct vpu_firmware_he
 	return VPU_SCHEDULING_MODE_HW;
 }
 
+static void
+ivpu_preemption_config_parse(struct ivpu_device *vdev, const struct vpu_firmware_header *fw_hdr)
+{
+	struct ivpu_fw_info *fw = vdev->fw;
+	u32 primary_preempt_buf_size, secondary_preempt_buf_size;
+
+	if (fw_hdr->preemption_buffer_1_max_size)
+		primary_preempt_buf_size = fw_hdr->preemption_buffer_1_max_size;
+	else
+		primary_preempt_buf_size = fw_hdr->preemption_buffer_1_size;
+
+	if (fw_hdr->preemption_buffer_2_max_size)
+		secondary_preempt_buf_size = fw_hdr->preemption_buffer_2_max_size;
+	else
+		secondary_preempt_buf_size = fw_hdr->preemption_buffer_2_size;
+
+	ivpu_dbg(vdev, FW_BOOT, "Preemption buffer size, primary: %u, secondary: %u\n",
+		 primary_preempt_buf_size, secondary_preempt_buf_size);
+
+	if (primary_preempt_buf_size < FW_PREEMPT_BUF_MIN_SIZE ||
+	    secondary_preempt_buf_size < FW_PREEMPT_BUF_MIN_SIZE) {
+		ivpu_warn(vdev, "Preemption buffers size too small\n");
+		return;
+	}
+
+	if (primary_preempt_buf_size > FW_PREEMPT_BUF_MAX_SIZE ||
+	    secondary_preempt_buf_size > FW_PREEMPT_BUF_MAX_SIZE) {
+		ivpu_warn(vdev, "Preemption buffers size too big\n");
+		return;
+	}
+
+	if (fw->sched_mode != VPU_SCHEDULING_MODE_HW)
+		return;
+
+	if (ivpu_test_mode & IVPU_TEST_MODE_MIP_DISABLE)
+		return;
+
+	vdev->fw->primary_preempt_buf_size = ALIGN(primary_preempt_buf_size, PAGE_SIZE);
+	vdev->fw->secondary_preempt_buf_size = ALIGN(secondary_preempt_buf_size, PAGE_SIZE);
+}
+
 static int ivpu_fw_parse(struct ivpu_device *vdev)
 {
 	struct ivpu_fw_info *fw = vdev->fw;
@@ -235,17 +278,9 @@ static int ivpu_fw_parse(struct ivpu_device *vdev)
 	fw->sched_mode = ivpu_fw_sched_mode_select(vdev, fw_hdr);
 	ivpu_info(vdev, "Scheduler mode: %s\n", fw->sched_mode ? "HW" : "OS");
 
-	if (fw_hdr->preemption_buffer_1_max_size)
-		fw->primary_preempt_buf_size = fw_hdr->preemption_buffer_1_max_size;
-	else
-		fw->primary_preempt_buf_size = fw_hdr->preemption_buffer_1_size;
-
-	if (fw_hdr->preemption_buffer_2_max_size)
-		fw->secondary_preempt_buf_size = fw_hdr->preemption_buffer_2_max_size;
-	else
-		fw->secondary_preempt_buf_size = fw_hdr->preemption_buffer_2_size;
-	ivpu_dbg(vdev, FW_BOOT, "Preemption buffer sizes: primary %u, secondary %u\n",
-		 fw->primary_preempt_buf_size, fw->secondary_preempt_buf_size);
+	ivpu_preemption_config_parse(vdev, fw_hdr);
+	ivpu_dbg(vdev, FW_BOOT, "Mid-inference preemption %s supported\n",
+		 ivpu_fw_preempt_buf_size(vdev) ? "is" : "is not");
 
 	if (fw_hdr->ro_section_start_address && !is_within_range(fw_hdr->ro_section_start_address,
 								 fw_hdr->ro_section_size,
diff --git a/drivers/accel/ivpu/ivpu_fw.h b/drivers/accel/ivpu/ivpu_fw.h
index 7081913fb0ddea..6fe2917abda63b 100644
--- a/drivers/accel/ivpu/ivpu_fw.h
+++ b/drivers/accel/ivpu/ivpu_fw.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
- * Copyright (C) 2020-2024 Intel Corporation
+ * Copyright (C) 2020-2025 Intel Corporation
  */
 
 #ifndef __IVPU_FW_H__
@@ -52,4 +52,9 @@ static inline bool ivpu_fw_is_cold_boot(struct ivpu_device *vdev)
 	return vdev->fw->entry_point == vdev->fw->cold_boot_entry_point;
 }
 
+static inline u32 ivpu_fw_preempt_buf_size(struct ivpu_device *vdev)
+{
+	return vdev->fw->primary_preempt_buf_size + vdev->fw->secondary_preempt_buf_size;
+}
+
 #endif /* __IVPU_FW_H__ */
diff --git a/drivers/accel/ivpu/ivpu_gem.h b/drivers/accel/ivpu/ivpu_gem.h
index aa8ff14f7aae1a..3ee996d503b27d 100644
--- a/drivers/accel/ivpu/ivpu_gem.h
+++ b/drivers/accel/ivpu/ivpu_gem.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
- * Copyright (C) 2020-2023 Intel Corporation
+ * Copyright (C) 2020-2025 Intel Corporation
  */
 #ifndef __IVPU_GEM_H__
 #define __IVPU_GEM_H__
@@ -96,4 +96,9 @@ static inline u32 cpu_to_vpu_addr(struct ivpu_bo *bo, void *cpu_addr)
 	return bo->vpu_addr + (cpu_addr - ivpu_bo_vaddr(bo));
 }
 
+static inline bool ivpu_bo_is_mappable(struct ivpu_bo *bo)
+{
+	return bo->flags & DRM_IVPU_BO_MAPPABLE;
+}
+
 #endif /* __IVPU_GEM_H__ */
diff --git a/drivers/accel/ivpu/ivpu_job.c b/drivers/accel/ivpu/ivpu_job.c
index b9902dd0cad58d..044268d0fc875c 100644
--- a/drivers/accel/ivpu/ivpu_job.c
+++ b/drivers/accel/ivpu/ivpu_job.c
@@ -34,22 +34,20 @@ static void ivpu_cmdq_ring_db(struct ivpu_device *vdev, struct ivpu_cmdq *cmdq)
 static int ivpu_preemption_buffers_create(struct ivpu_device *vdev,
 					  struct ivpu_file_priv *file_priv, struct ivpu_cmdq *cmdq)
 {
-	u64 primary_size = ALIGN(vdev->fw->primary_preempt_buf_size, PAGE_SIZE);
-	u64 secondary_size = ALIGN(vdev->fw->secondary_preempt_buf_size, PAGE_SIZE);
-
-	if (vdev->fw->sched_mode != VPU_SCHEDULING_MODE_HW ||
-	    ivpu_test_mode & IVPU_TEST_MODE_MIP_DISABLE)
+	if (ivpu_fw_preempt_buf_size(vdev) == 0)
 		return 0;
 
 	cmdq->primary_preempt_buf = ivpu_bo_create(vdev, &file_priv->ctx, &vdev->hw->ranges.user,
-						   primary_size, DRM_IVPU_BO_WC);
+						   vdev->fw->primary_preempt_buf_size,
+						   DRM_IVPU_BO_WC);
 	if (!cmdq->primary_preempt_buf) {
 		ivpu_err(vdev, "Failed to create primary preemption buffer\n");
 		return -ENOMEM;
 	}
 
 	cmdq->secondary_preempt_buf = ivpu_bo_create(vdev, &file_priv->ctx, &vdev->hw->ranges.dma,
-						     secondary_size, DRM_IVPU_BO_WC);
+						     vdev->fw->secondary_preempt_buf_size,
+						     DRM_IVPU_BO_WC);
 	if (!cmdq->secondary_preempt_buf) {
 		ivpu_err(vdev, "Failed to create secondary preemption buffer\n");
 		goto err_free_primary;
@@ -66,20 +64,39 @@ err_free_primary:
 static void ivpu_preemption_buffers_free(struct ivpu_device *vdev,
 					 struct ivpu_file_priv *file_priv, struct ivpu_cmdq *cmdq)
 {
-	if (vdev->fw->sched_mode != VPU_SCHEDULING_MODE_HW)
-		return;
-
 	if (cmdq->primary_preempt_buf)
 		ivpu_bo_free(cmdq->primary_preempt_buf);
 	if (cmdq->secondary_preempt_buf)
 		ivpu_bo_free(cmdq->secondary_preempt_buf);
 }
 
+static int ivpu_preemption_job_init(struct ivpu_device *vdev, struct ivpu_file_priv *file_priv,
+				    struct ivpu_cmdq *cmdq, struct ivpu_job *job)
+{
+	int ret;
+
+	/* Use preemption buffer provided by the user space */
+	if (job->primary_preempt_buf)
+		return 0;
+
+	if (!cmdq->primary_preempt_buf) {
+		/* Allocate per command queue preemption buffers */
+		ret = ivpu_preemption_buffers_create(vdev, file_priv, cmdq);
+		if (ret)
+			return ret;
+	}
+
+	/* Use preemption buffers allocated by the kernel */
+	job->primary_preempt_buf = cmdq->primary_preempt_buf;
+	job->secondary_preempt_buf = cmdq->secondary_preempt_buf;
+
+	return 0;
+}
+
 static struct ivpu_cmdq *ivpu_cmdq_alloc(struct ivpu_file_priv *file_priv)
 {
 	struct ivpu_device *vdev = file_priv->vdev;
 	struct ivpu_cmdq *cmdq;
-	int ret;
 
 	cmdq = kzalloc(sizeof(*cmdq), GFP_KERNEL);
 	if (!cmdq)
@@ -89,10 +106,6 @@ static struct ivpu_cmdq *ivpu_cmdq_alloc(struct ivpu_file_priv *file_priv)
 	if (!cmdq->mem)
 		goto err_free_cmdq;
 
-	ret = ivpu_preemption_buffers_create(vdev, file_priv, cmdq);
-	if (ret)
-		ivpu_warn(vdev, "Failed to allocate preemption buffers, preemption limited\n");
-
 	return cmdq;
 
 err_free_cmdq:
@@ -429,17 +442,14 @@ static int ivpu_cmdq_push_job(struct ivpu_cmdq *cmdq, struct ivpu_job *job)
 	if (unlikely(ivpu_test_mode & IVPU_TEST_MODE_NULL_SUBMISSION))
 		entry->flags = VPU_JOB_FLAGS_NULL_SUBMISSION_MASK;
 
-	if (vdev->fw->sched_mode == VPU_SCHEDULING_MODE_HW) {
-		if (cmdq->primary_preempt_buf) {
-			entry->primary_preempt_buf_addr = cmdq->primary_preempt_buf->vpu_addr;
-			entry->primary_preempt_buf_size = ivpu_bo_size(cmdq->primary_preempt_buf);
-		}
+	if (job->primary_preempt_buf) {
+		entry->primary_preempt_buf_addr = job->primary_preempt_buf->vpu_addr;
+		entry->primary_preempt_buf_size = ivpu_bo_size(job->primary_preempt_buf);
+	}
 
-		if (cmdq->secondary_preempt_buf) {
-			entry->secondary_preempt_buf_addr = cmdq->secondary_preempt_buf->vpu_addr;
-			entry->secondary_preempt_buf_size =
-				ivpu_bo_size(cmdq->secondary_preempt_buf);
-		}
+	if (job->secondary_preempt_buf) {
+		entry->secondary_preempt_buf_addr = job->secondary_preempt_buf->vpu_addr;
+		entry->secondary_preempt_buf_size = ivpu_bo_size(job->secondary_preempt_buf);
 	}
 
 	wmb(); /* Ensure that tail is updated after filling entry */
@@ -663,6 +673,13 @@ static int ivpu_job_submit(struct ivpu_job *job, u8 priority, u32 cmdq_id)
 		goto err_unlock;
 	}
 
+	ret = ivpu_preemption_job_init(vdev, file_priv, cmdq, job);
+	if (ret) {
+		ivpu_err(vdev, "Failed to initialize preemption buffers for job %d: %d\n",
+			 job->job_id, ret);
+		goto err_unlock;
+	}
+
 	job->cmdq_id = cmdq->id;
 
 	is_first_job = xa_empty(&vdev->submitted_jobs_xa);
@@ -716,7 +733,7 @@ err_unlock:
 
 static int
 ivpu_job_prepare_bos_for_submit(struct drm_file *file, struct ivpu_job *job, u32 *buf_handles,
-				u32 buf_count, u32 commands_offset)
+				u32 buf_count, u32 commands_offset, u32 preempt_buffer_index)
 {
 	struct ivpu_file_priv *file_priv = job->file_priv;
 	struct ivpu_device *vdev = file_priv->vdev;
@@ -752,6 +769,20 @@ ivpu_job_prepare_bos_for_submit(struct drm_file *file, struct ivpu_job *job, u32
 
 	job->cmd_buf_vpu_addr = bo->vpu_addr + commands_offset;
 
+	if (preempt_buffer_index) {
+		struct ivpu_bo *preempt_bo = job->bos[preempt_buffer_index];
+
+		if (ivpu_bo_size(preempt_bo) < ivpu_fw_preempt_buf_size(vdev)) {
+			ivpu_warn(vdev, "Preemption buffer is too small\n");
+			return -EINVAL;
+		}
+		if (ivpu_bo_is_mappable(preempt_bo)) {
+			ivpu_warn(vdev, "Preemption buffer cannot be mappable\n");
+			return -EINVAL;
+		}
+		job->primary_preempt_buf = preempt_bo;
+	}
+
 	ret = drm_gem_lock_reservations((struct drm_gem_object **)job->bos, buf_count,
 					&acquire_ctx);
 	if (ret) {
@@ -782,7 +813,7 @@ unlock_reservations:
 
 static int ivpu_submit(struct drm_file *file, struct ivpu_file_priv *file_priv, u32 cmdq_id,
 		       u32 buffer_count, u32 engine, void __user *buffers_ptr, u32 cmds_offset,
-		       u8 priority)
+		       u32 preempt_buffer_index, u8 priority)
 {
 	struct ivpu_device *vdev = file_priv->vdev;
 	struct ivpu_job *job;
@@ -814,7 +845,8 @@ static int ivpu_submit(struct drm_file *file, struct ivpu_file_priv *file_priv,
 		goto err_exit_dev;
 	}
 
-	ret = ivpu_job_prepare_bos_for_submit(file, job, buf_handles, buffer_count, cmds_offset);
+	ret = ivpu_job_prepare_bos_for_submit(file, job, buf_handles, buffer_count, cmds_offset,
+					      preempt_buffer_index);
 	if (ret) {
 		ivpu_err(vdev, "Failed to prepare job: %d\n", ret);
 		goto err_destroy_job;
@@ -868,7 +900,7 @@ int ivpu_submit_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
 	priority = ivpu_job_to_jsm_priority(args->priority);
 
 	return ivpu_submit(file, file_priv, 0, args->buffer_count, args->engine,
-			   (void __user *)args->buffers_ptr, args->commands_offset, priority);
+			   (void __user *)args->buffers_ptr, args->commands_offset, 0, priority);
 }
 
 int ivpu_cmdq_submit_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
@@ -885,6 +917,9 @@ int ivpu_cmdq_submit_ioctl(struct drm_device *dev, void *data, struct drm_file *
 	if (args->buffer_count == 0 || args->buffer_count > JOB_MAX_BUFFER_COUNT)
 		return -EINVAL;
 
+	if (args->preempt_buffer_index >= args->buffer_count)
+		return -EINVAL;
+
 	if (!IS_ALIGNED(args->commands_offset, 8))
 		return -EINVAL;
 
@@ -895,7 +930,8 @@ int ivpu_cmdq_submit_ioctl(struct drm_device *dev, void *data, struct drm_file *
 		return -EBADFD;
 
 	return ivpu_submit(file, file_priv, args->cmdq_id, args->buffer_count, VPU_ENGINE_COMPUTE,
-			   (void __user *)args->buffers_ptr, args->commands_offset, 0);
+			   (void __user *)args->buffers_ptr, args->commands_offset,
+			   args->preempt_buffer_index, 0);
 }
 
 int ivpu_cmdq_create_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
diff --git a/drivers/accel/ivpu/ivpu_job.h b/drivers/accel/ivpu/ivpu_job.h
index 2e301c2eea7b9e..6c8b9c739b5109 100644
--- a/drivers/accel/ivpu/ivpu_job.h
+++ b/drivers/accel/ivpu/ivpu_job.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
- * Copyright (C) 2020-2024 Intel Corporation
+ * Copyright (C) 2020-2025 Intel Corporation
  */
 
 #ifndef __IVPU_JOB_H__
@@ -55,6 +55,8 @@ struct ivpu_job {
 	u32 job_id;
 	u32 engine_idx;
 	size_t bo_count;
+	struct ivpu_bo *primary_preempt_buf;
+	struct ivpu_bo *secondary_preempt_buf;
 	struct ivpu_bo *bos[] __counted_by(bo_count);
 };
 
diff --git a/include/uapi/drm/ivpu_accel.h b/include/uapi/drm/ivpu_accel.h
index 160ee1411d4a08..e470b0221e0201 100644
--- a/include/uapi/drm/ivpu_accel.h
+++ b/include/uapi/drm/ivpu_accel.h
@@ -90,6 +90,7 @@ extern "C" {
 #define DRM_IVPU_PARAM_TILE_CONFIG	    11
 #define DRM_IVPU_PARAM_SKU		    12
 #define DRM_IVPU_PARAM_CAPABILITIES	    13
+#define DRM_IVPU_PARAM_PREEMPT_BUFFER_SIZE  14
 
 #define DRM_IVPU_PLATFORM_TYPE_SILICON	    0
 
@@ -176,6 +177,9 @@ struct drm_ivpu_param {
 	 *
 	 * %DRM_IVPU_PARAM_CAPABILITIES:
 	 * Supported capabilities (read-only)
+	 *
+	 * %DRM_IVPU_PARAM_PREEMPT_BUFFER_SIZE:
+	 * Size of the preemption buffer (read-only)
 	 */
 	__u32 param;
 
@@ -371,6 +375,13 @@ struct drm_ivpu_cmdq_submit {
 	 * to be executed. The offset has to be 8-byte aligned.
 	 */
 	__u32 commands_offset;
+	/**
+	 * @preempt_buffer_index:
+	 *
+	 * Index of the preemption buffer in the buffers_ptr array.
+	 */
+	__u32 preempt_buffer_index;
+	__u32 reserved;
 };
 
 /* drm_ivpu_bo_wait job status codes */