[i-g-t 2/4] lib/xe/xe_util: Introduce helper functions for buffer creation and command submission etc

[Oak Zeng <oak.zeng@intel.com>]

From: Bommu Krishnaiah <krishnaiah.bommu@intel.com>

Introduce helper functions for buffer creation, binding, command submission, and
destruction. With those helpers, writing a xe igt test will be much easier, which
will be showed in a coming example.

Signed-off-by: Bommu Krishnaiah <krishnaiah.bommu@intel.com>
Signed-off-by: Oak Zeng <oak.zeng@intel.com>
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
---
 lib/xe/xe_util.c | 185 +++++++++++++++++++++++++++++++++++++++++++++++
 lib/xe/xe_util.h |  33 +++++++++
 2 files changed, 218 insertions(+)

diff --git a/lib/xe/xe_util.c b/lib/xe/xe_util.c
index 06b378ce0..aa2c05a2c 100644
--- a/lib/xe/xe_util.c
+++ b/lib/xe/xe_util.c
@@ -13,6 +13,191 @@
 #include "xe/xe_query.h"
 #include "xe/xe_util.h"
 
+/**
+ * __xe_submit_cmd:
+ * @cmdbuf Pointer to the command buffer structure
+ *
+ * Submits a command buffer to the GPU, waits for its completion, and verifies
+ * the user fence value
+ *
+ * Return: The result of waiting for the user fence value
+ */
+int64_t __xe_submit_cmd(struct xe_buffer *cmdbuf)
+{
+	int64_t timeout = NSEC_PER_SEC;
+	int ret;
+
+	struct drm_xe_sync sync[1] = {
+		{ .type = DRM_XE_SYNC_TYPE_USER_FENCE,
+			.flags = DRM_XE_SYNC_FLAG_SIGNAL,
+			.timeline_value = USER_FENCE_VALUE,
+			.addr = xe_cmdbuf_exec_ufence_gpuva(cmdbuf),},
+	};
+	struct drm_xe_exec exec = {
+		.num_batch_buffer = 1,
+		.num_syncs = 1,
+		.syncs = to_user_pointer(&sync),
+		.exec_queue_id = cmdbuf->exec_queue,
+		.address = (uint64_t)cmdbuf->gpu_addr,
+	};
+
+	xe_exec(cmdbuf->fd, &exec);
+	ret = __xe_wait_ufence(cmdbuf->fd, xe_cmdbuf_exec_ufence_cpuva(cmdbuf),USER_FENCE_VALUE, cmdbuf->exec_queue, &timeout);
+	memset(xe_cmdbuf_exec_ufence_cpuva(cmdbuf), 0, UFENCE_LENGTH);
+	return ret;
+}
+
+/**
+ * xe_submit_cmd:
+ * @cmdbuf Pointer to the command buffer structure
+ *
+ * Wrapper function to submit a command buffer and assert its successful
+ * execution.
+ */
+void xe_submit_cmd(struct xe_buffer *cmdbuf)
+{
+	int64_t ret;
+
+	ret = __xe_submit_cmd(cmdbuf);
+	igt_assert_eq(ret, 0);
+}
+
+/**
+ *xe_create_buffer:
+ * @buffer Pointer to the xe_buffer structure containing buffer details.
+ *
+ * Creates a buffer, maps it to both CPU and GPU address spaces, and binds it
+ * to a virtual memory (VM) space.
+ */
+void xe_create_buffer(struct xe_buffer *buffer)
+{
+	struct drm_xe_sync sync[1] = {
+		{ .type = DRM_XE_SYNC_TYPE_USER_FENCE, .flags = DRM_XE_SYNC_FLAG_SIGNAL,
+			.timeline_value = USER_FENCE_VALUE },
+	};
+
+	buffer->bind_queue = xe_bind_exec_queue_create(buffer->fd, buffer->vm, 0);
+	buffer->bind_ufence = aligned_alloc(xe_get_default_alignment(buffer->fd), PAGE_ALIGN_UFENCE);
+	sync->addr = (uint64_t)buffer->bind_ufence;
+
+
+	/* create and bind the buffer->bo */
+	buffer->bo = xe_bo_create(buffer->fd, 0, buffer->size, buffer->placement, buffer->flag);
+	buffer->cpu_addr = xe_bo_map(buffer->fd, buffer->bo, buffer->size);
+	xe_vm_bind_async(buffer->fd, buffer->vm, buffer->bind_queue, buffer->bo, 0, buffer->gpu_addr, buffer->size, sync, 1);
+
+	xe_wait_ufence(buffer->fd, (uint64_t *)buffer->bind_ufence, USER_FENCE_VALUE, buffer->bind_queue, NSEC_PER_SEC);
+	memset(buffer->bind_ufence, 0, PAGE_ALIGN_UFENCE);
+}
+
+/**
+ * xe_destroy_buffer:
+ * @buffer Pointer to the xe_buffer structure containing buffer details
+ *
+ * Destroys a buffer created by xe_create_buffer and releases associated
+ * resources.
+ */
+void xe_destroy_buffer(struct xe_buffer *buffer)
+{
+	struct drm_xe_sync sync[1] = {
+		{ .type = DRM_XE_SYNC_TYPE_USER_FENCE, .flags = DRM_XE_SYNC_FLAG_SIGNAL,
+			.timeline_value = USER_FENCE_VALUE },
+	};
+	sync->addr = (uint64_t)buffer->bind_ufence;
+
+	xe_vm_unbind_async(buffer->fd, buffer->vm, buffer->bind_queue, 0, buffer->gpu_addr, buffer->size, sync, 1);
+	xe_wait_ufence(buffer->fd, (uint64_t *)buffer->bind_ufence, USER_FENCE_VALUE, buffer->bind_queue, NSEC_PER_SEC);
+	memset(buffer->bind_ufence, 0, PAGE_ALIGN_UFENCE);
+
+	munmap(buffer->cpu_addr, buffer->size);
+	gem_close(buffer->fd, buffer->bo);
+
+	free(buffer->bind_ufence);
+	xe_exec_queue_destroy(buffer->fd, buffer->bind_queue);
+}
+
+/**
+ * insert_store:
+ * @batch Pointer to the batch buffer where commands will be inserted.
+ * @dst_va Destination virtual address to store the value.
+ * @val Value to be stored.
+ *
+ * Inserts a MI_STORE_DWORD_IMM_GEN4 command into a batch buffer, which stores
+ * an immediate value to a given destination virtual address.
+ * */
+void insert_store(uint32_t *batch, uint64_t dst_va, uint32_t val)
+{
+	int i = 0;
+
+	batch[i] = MI_STORE_DWORD_IMM_GEN4;
+	batch[++i] = dst_va;
+	batch[++i] = dst_va >> 32;
+	batch[++i] = val;
+	batch[++i] = MI_BATCH_BUFFER_END;
+}
+
+/**
+ * xe_create_cmdbuf:
+ * @cmd_buf Pointer to the xe_buffer structure representing the command buffer.
+ * @fill_func Pointer to the function that fills the command buffer.
+ * @dst_va Virtual address of the memory location where val need to store.
+ * @val Value to be written to the memory locations.
+ * @eci Pointer to the engine class instance for execution.
+ *
+ * Creates a command buffer, fills it with commands using the provided fill
+ * function, and sets up the execution queue for submission.
+ */
+void xe_create_cmdbuf(struct xe_buffer *cmd_buf, cmdbuf_fill_func_t fill_func, uint64_t dst_va, uint32_t val, struct drm_xe_engine_class_instance *eci)
+{
+	/*
+	 * make some room for a exec_ufence, which will be used to sync the
+	 * submission of this command....
+	 */
+	cmd_buf->size = xe_bb_size(cmd_buf->fd, cmd_buf->size + PAGE_ALIGN_UFENCE);
+	xe_create_buffer(cmd_buf);
+	cmd_buf->exec_queue = xe_exec_queue_create(cmd_buf->fd, cmd_buf->vm, eci, 0);
+	fill_func(cmd_buf->cpu_addr, dst_va, val);
+}
+
+/**
+ * xe_destroy_cmdbuf:
+ * @cmd_buf Pointer to the xe_buffer structure representing the command buffer.
+ *
+ * Destroys a command buffer created by xe_create_cmdbuf and releases
+ * associated resources.
+ */
+void xe_destroy_cmdbuf(struct xe_buffer *cmd_buf)
+{
+	xe_exec_queue_destroy(cmd_buf->fd, cmd_buf->exec_queue);
+	xe_destroy_buffer(cmd_buf);
+}
+
+/**
+ * xe_cmdbuf_exec_ufence_gpuva:
+ * @cmd_buf Pointer to the xe_buffer structure representing the command buffer.
+ *
+ * Returns the GPU virtual address of the execution user fence located at the
+ * end of the command buffer.
+ */
+uint64_t xe_cmdbuf_exec_ufence_gpuva(struct xe_buffer *cmd_buf)
+{
+	/* the last 8 bytes of the cmd buffer is used as ufence */
+	return (uint64_t)cmd_buf->gpu_addr + cmd_buf->size - UFENCE_LENGTH;
+}
+
+/**
+ * xe_cmdbuf_exec_ufence_cpuva:
+ * @cmd_buf Pointer to the xe_buffer structure representing the command buffer.
+ *
+ * Returns the CPU virtual address of the execution user fence located at the
+ * end of the command buffer.
+ */
+uint64_t *xe_cmdbuf_exec_ufence_cpuva(struct xe_buffer *cmd_buf)
+{
+	/* the last 8 bytes of the cmd buffer is used as ufence */
+	return cmd_buf->cpu_addr + cmd_buf->size - UFENCE_LENGTH;
+}
+
 static bool __region_belongs_to_regions_type(struct drm_xe_mem_region *region,
 					     uint32_t *mem_regions_type,
 					     int num_regions)
diff --git a/lib/xe/xe_util.h b/lib/xe/xe_util.h
index 06ebd3c2a..54f25619f 100644
--- a/lib/xe/xe_util.h
+++ b/lib/xe/xe_util.h
@@ -14,6 +14,39 @@
 
 #include "xe_query.h"
 
+#define USER_FENCE_VALUE        0xdeadbeefdeadbeefull
+#define PAGE_ALIGN_UFENCE	4096
+#define UFENCE_LENGTH		8
+
+struct xe_buffer {
+	void *cpu_addr;
+	uint64_t gpu_addr;
+	/*the user fence used to vm bind this buffer*/
+	uint32_t *bind_ufence;
+	uint64_t size;
+	uint32_t flag;
+	uint32_t vm;
+	uint32_t bo;
+	uint32_t placement;
+	uint32_t bind_queue;
+	/*only a cmd buffer has a exec queue*/
+	uint32_t exec_queue;
+	int fd;
+	bool is_userptr;
+};
+
+typedef void (*cmdbuf_fill_func_t) (uint32_t *batch, uint64_t dst_gpu_va, uint32_t val);
+void xe_create_buffer(struct xe_buffer *buffer);
+void xe_create_cmdbuf(struct xe_buffer *cmd_buf, cmdbuf_fill_func_t fill_func,
+		uint64_t dst_va, uint32_t val, struct drm_xe_engine_class_instance *eci);
+uint64_t xe_cmdbuf_exec_ufence_gpuva(struct xe_buffer *cmd_buf);
+uint64_t *xe_cmdbuf_exec_ufence_cpuva(struct xe_buffer *cmd_buf);
+void insert_store(uint32_t *batch, uint64_t dst_va, uint32_t val);
+void xe_submit_cmd(struct xe_buffer *cmdbuf);
+int64_t __xe_submit_cmd(struct xe_buffer *cmdbuf);
+void xe_destroy_buffer(struct xe_buffer *buffer);
+void xe_destroy_cmdbuf(struct xe_buffer *cmd_buf);
+
 #define XE_IS_SYSMEM_MEMORY_REGION(fd, region) \
 	(xe_region_class(fd, region) == DRM_XE_MEM_REGION_CLASS_SYSMEM)
 #define XE_IS_VRAM_MEMORY_REGION(fd, region) \
-- 
2.26.3