[PATCH i-g-t 5/5] lib/intel_compute: Allow the user to provide input and output buffers

[Francois Dugast]

Allow the user to create and provide the buffers to be used as input
and as output of the compute kernel. This allows special handling as
well as read/write from outside the compute library. Support is
limited to xe2lpg.

Signed-off-by: Francois Dugast <francois.dugast at intel.com>
---
 lib/intel_compute.c | 32 ++++++++++++++++++++++++--------
 lib/intel_compute.h |  2 ++
 2 files changed, 26 insertions(+), 8 deletions(-)

diff --git a/lib/intel_compute.c b/lib/intel_compute.c
index db6e81c38..6dc8ffd79 100644
--- a/lib/intel_compute.c
+++ b/lib/intel_compute.c
@@ -1662,6 +1662,8 @@ static void xe2lpg_compute_exec(int fd, const unsigned char *kernel,
 
 	struct bo_execenv execenv;
 	float *input_data, *output_data;
+	uint64_t bind_input_addr = (user && user->input_addr) ? user->input_addr : ADDR_INPUT;
+	uint64_t bind_output_addr = (user && user->output_addr) ? user->output_addr : ADDR_OUTPUT;
 
 	bo_execenv_create(fd, &execenv, eci, user);
 
@@ -1672,16 +1674,24 @@ static void xe2lpg_compute_exec(int fd, const unsigned char *kernel,
 
 	memcpy(bo_dict[0].data, kernel, size);
 	create_dynamic_state(bo_dict[1].data, OFFSET_KERNEL);
-	xehp_create_surface_state(bo_dict[2].data, ADDR_INPUT, ADDR_OUTPUT);
-	xehp_create_indirect_data(bo_dict[3].data, ADDR_INPUT, ADDR_OUTPUT);
-	xehp_create_surface_state(bo_dict[7].data, ADDR_INPUT, ADDR_OUTPUT);
+	xehp_create_surface_state(bo_dict[2].data, bind_input_addr, bind_output_addr);
+	xehp_create_indirect_data(bo_dict[3].data, bind_input_addr, bind_output_addr);
+	xehp_create_surface_state(bo_dict[7].data, bind_input_addr, bind_output_addr);
 
-	input_data = (float *) bo_dict[4].data;
-	output_data = (float *) bo_dict[5].data;
-	srand(time(NULL));
+	if (user && user->input_addr) {
+		input_data = (float *) user->input_addr;
+	} else {
+		input_data = (float *) bo_dict[4].data;
+		srand(time(NULL));
 
-	for (int i = 0; i < SIZE_DATA; i++)
-		input_data[i] = rand() / (float)RAND_MAX;
+		for (int i = 0; i < SIZE_DATA; i++)
+			input_data[i] = rand() / (float)RAND_MAX;
+	}
+
+	if (user && user->output_addr)
+		output_data = (float *) user->output_addr;
+	else
+		output_data = (float *) bo_dict[5].data;
 
 	xe2lpg_compute_exec_compute(bo_dict[8].data,
 				  ADDR_GENERAL_STATE_BASE,
@@ -1794,6 +1804,12 @@ static bool __run_intel_compute_kernel(int fd,
 		return false;
 	}
 
+	if (user && (user->input_addr || user->output_addr) &&
+	    intel_compute_batches[batch].compute_exec != xe2lpg_compute_exec) {
+		igt_debug("GPU version 0x%x does not support user input/output buffers\n", ip_ver);
+		return false;
+	}
+
 	/* If the user provides a kernel, use it */
 	if (user && user->kernel) {
 		kernel = user->kernel;
diff --git a/lib/intel_compute.h b/lib/intel_compute.h
index f32da2734..3e2fd7266 100644
--- a/lib/intel_compute.h
+++ b/lib/intel_compute.h
@@ -38,6 +38,8 @@ struct user_execenv {
 	const unsigned char *kernel;
 	unsigned int kernel_size;
 	bool skip_results_check;
+	uint64_t input_addr;
+	uint64_t output_addr;
 };
 
 extern const struct intel_compute_kernels intel_compute_square_kernels[];
-- 
2.43.0