Re: [PATCH v3 20/29] media: iris: subscribe parameters and properties to firmware for hfi_gen2

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On 27/08/2024 11:05, Dikshita Agarwal via B4 Relay wrote:
From: Vedang Nagar <quic_vnagar@xxxxxxxxxxx>

For hfi_gen2, subscribe for different bitstream parameters to
firmware to get notified for change in any of the subscribed
parameters.

Signed-off-by: Vedang Nagar <quic_vnagar@xxxxxxxxxxx>
Signed-off-by: Dikshita Agarwal <quic_dikshita@xxxxxxxxxxx>
---
  drivers/media/platform/qcom/iris/iris_hfi_gen2.h   |   6 +
  .../platform/qcom/iris/iris_hfi_gen2_command.c     | 179 +++++++++++++++++++++
  .../platform/qcom/iris/iris_hfi_gen2_defines.h     |   9 ++
  .../platform/qcom/iris/iris_platform_common.h      |   4 +
  .../platform/qcom/iris/iris_platform_sm8550.c      |  13 ++
  5 files changed, 211 insertions(+)

diff --git a/drivers/media/platform/qcom/iris/iris_hfi_gen2.h b/drivers/media/platform/qcom/iris/iris_hfi_gen2.h
index 8170c1fef569..5fbbab844025 100644
--- a/drivers/media/platform/qcom/iris/iris_hfi_gen2.h
+++ b/drivers/media/platform/qcom/iris/iris_hfi_gen2.h
@@ -18,12 +18,18 @@ struct iris_core;
   *
   * @inst: pointer to iris_instance structure
   * @packet: HFI packet
+ * @ipsc_properties_set: boolean to set ipsc properties to fw
+ * @opsc_properties_set: boolean to set opsc properties to fw
   * @src_subcr_params: subscription params to fw on input port
+ * @dst_subcr_params: subscription params to fw on output port
   */
  struct iris_inst_hfi_gen2 {
  	struct iris_inst		inst;
  	struct iris_hfi_header		*packet;
+	bool				ipsc_properties_set;
+	bool				opsc_properties_set;
  	struct hfi_subscription_params	src_subcr_params;
+	struct hfi_subscription_params	dst_subcr_params;
  };
void iris_hfi_gen2_command_ops_init(struct iris_core *core);
diff --git a/drivers/media/platform/qcom/iris/iris_hfi_gen2_command.c b/drivers/media/platform/qcom/iris/iris_hfi_gen2_command.c
index e50f00021f6d..791b535a3584 100644
--- a/drivers/media/platform/qcom/iris/iris_hfi_gen2_command.c
+++ b/drivers/media/platform/qcom/iris/iris_hfi_gen2_command.c
@@ -472,6 +472,9 @@ static int iris_hfi_gen2_session_open(struct iris_inst *inst)
  	if (inst->state != IRIS_INST_DEINIT)
  		return -EALREADY;
+ inst_hfi_gen2->ipsc_properties_set = false;
+	inst_hfi_gen2->opsc_properties_set = false;
+
  	inst_hfi_gen2->packet = kzalloc(4096, GFP_KERNEL);
  	if (!inst_hfi_gen2->packet)
  		return -ENOMEM;
@@ -536,9 +539,185 @@ static int iris_hfi_gen2_session_close(struct iris_inst *inst)
  	return ret;
  }
+static int iris_hfi_gen2_session_subscribe_mode(struct iris_inst *inst,
+						u32 cmd, u32 plane, u32 payload_type,
+						void *payload, u32 payload_size)
+{
+	struct iris_inst_hfi_gen2 *inst_hfi_gen2 = to_iris_inst_hfi_gen2(inst);
+
+	iris_hfi_gen2_packet_session_command(inst,
+					     cmd,
+					     (HFI_HOST_FLAGS_RESPONSE_REQUIRED |
+					     HFI_HOST_FLAGS_INTR_REQUIRED),
+					     iris_hfi_gen2_get_port(plane),
+					     inst->session_id,
+					     payload_type,
+					     payload,
+					     payload_size);
+
+	return iris_hfi_queue_cmd_write(inst->core, inst_hfi_gen2->packet,
+					inst_hfi_gen2->packet->size);
+}
+
+static int iris_hfi_gen2_subscribe_change_param(struct iris_inst *inst, u32 plane)
+{
+	struct iris_inst_hfi_gen2 *inst_hfi_gen2 = to_iris_inst_hfi_gen2(inst);
+	struct hfi_subscription_params subsc_params;
+	u32 prop_type, payload_size, payload_type;
+	struct iris_core *core = inst->core;
+	const u32 *change_param = NULL;
+	u32 change_param_size = 0;
+	u32 payload[32] = {0};
+	u32 hfi_port = 0;
+	int ret;
+	u32 i;
+
+	if ((V4L2_TYPE_IS_OUTPUT(plane) && inst_hfi_gen2->ipsc_properties_set) ||
+	    (V4L2_TYPE_IS_CAPTURE(plane) && inst_hfi_gen2->opsc_properties_set)) {
+		dev_err(core->dev, "invalid plane\n");
+		return 0;
+	}
+
+	change_param = core->iris_platform_data->input_config_params;
+	change_param_size = core->iris_platform_data->input_config_params_size;
+
+	if (!change_param || !change_param_size)
+		return -EINVAL;

That's an odd one, checking for zero but _not_ bounds checking chanage_param_size < (sizeof(payload)/sizeof(u32)) - 1

I'm not sure where inpug_config_param_size gets populated but I'd rather check that type of parameter - for exactly that reason - than the defensive coding done on your inputs elsewhere.

TL;DR why do you trust change_param_size < your array size but not change_param_size >= 1 ?

---
bod




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