[PATCH v5 35/39] ml/cnxk: add support to select OCM allocation mode

[Srikanth Yalavarthi <syalavarthi@marvell.com>]

Added device argument "ocm_alloc_mode" to select OCM allocation
method during model start. Two modes are supported by the driver.

Added implementation for ocm_alloc_mode lowest as default.

ocm_alloc_mode:
lowest:  Allocate from first available free slot / lowest
         tile ID in OCM (default)
largest: Allocate from a slot with maximum free memory

Signed-off-by: Srikanth Yalavarthi <syalavarthi@marvell.com>
---
 drivers/ml/cnxk/cn10k_ml_dev.c | 45 +++++++++++++++++++++++++++++-----
 drivers/ml/cnxk/cn10k_ml_ocm.c |  6 ++---
 drivers/ml/cnxk/cn10k_ml_ocm.h |  3 +++
 3 files changed, 44 insertions(+), 10 deletions(-)

diff --git a/drivers/ml/cnxk/cn10k_ml_dev.c b/drivers/ml/cnxk/cn10k_ml_dev.c
index 948708a420..5c02d67c8e 100644
--- a/drivers/ml/cnxk/cn10k_ml_dev.c
+++ b/drivers/ml/cnxk/cn10k_ml_dev.c
@@ -21,11 +21,13 @@
 #define CN10K_ML_FW_ENABLE_DPE_WARNINGS "enable_dpe_warnings"
 #define CN10K_ML_FW_REPORT_DPE_WARNINGS "report_dpe_warnings"
 #define CN10K_ML_DEV_CACHE_MODEL_DATA	"cache_model_data"
+#define CN10K_ML_OCM_ALLOC_MODE		"ocm_alloc_mode"
 
 #define CN10K_ML_FW_PATH_DEFAULT		"/lib/firmware/mlip-fw.bin"
 #define CN10K_ML_FW_ENABLE_DPE_WARNINGS_DEFAULT 1
 #define CN10K_ML_FW_REPORT_DPE_WARNINGS_DEFAULT 0
 #define CN10K_ML_DEV_CACHE_MODEL_DATA_DEFAULT	1
+#define CN10K_ML_OCM_ALLOC_MODE_DEFAULT		"lowest"
 
 /* ML firmware macros */
 #define FW_MEMZONE_NAME		 "ml_cn10k_fw_mz"
@@ -39,9 +41,12 @@
 #define FW_ENABLE_DPE_WARNING_BITMASK BIT(0)
 #define FW_REPORT_DPE_WARNING_BITMASK BIT(1)
 
-static const char *const valid_args[] = {CN10K_ML_FW_PATH, CN10K_ML_FW_ENABLE_DPE_WARNINGS,
+static const char *const valid_args[] = {CN10K_ML_FW_PATH,
+					 CN10K_ML_FW_ENABLE_DPE_WARNINGS,
 					 CN10K_ML_FW_REPORT_DPE_WARNINGS,
-					 CN10K_ML_DEV_CACHE_MODEL_DATA, NULL};
+					 CN10K_ML_DEV_CACHE_MODEL_DATA,
+					 CN10K_ML_OCM_ALLOC_MODE,
+					 NULL};
 
 /* Dummy operations for ML device */
 struct rte_ml_dev_ops ml_dev_dummy_ops = {0};
@@ -81,6 +86,8 @@ cn10k_mldev_parse_devargs(struct rte_devargs *devargs, struct cn10k_ml_dev *mlde
 	bool report_dpe_warnings_set = false;
 	bool cache_model_data_set = false;
 	struct rte_kvargs *kvlist = NULL;
+	bool ocm_alloc_mode_set = false;
+	char *ocm_alloc_mode = NULL;
 	bool fw_path_set = false;
 	char *fw_path = NULL;
 	int ret = 0;
@@ -140,6 +147,17 @@ cn10k_mldev_parse_devargs(struct rte_devargs *devargs, struct cn10k_ml_dev *mlde
 		cache_model_data_set = true;
 	}
 
+	if (rte_kvargs_count(kvlist, CN10K_ML_OCM_ALLOC_MODE) == 1) {
+		ret = rte_kvargs_process(kvlist, CN10K_ML_OCM_ALLOC_MODE, &parse_string_arg,
+					 &ocm_alloc_mode);
+		if (ret < 0) {
+			plt_err("Error processing arguments, key = %s\n", CN10K_ML_OCM_ALLOC_MODE);
+			ret = -EINVAL;
+			goto exit;
+		}
+		ocm_alloc_mode_set = true;
+	}
+
 check_args:
 	if (!fw_path_set)
 		mldev->fw.path = CN10K_ML_FW_PATH_DEFAULT;
@@ -183,6 +201,20 @@ cn10k_mldev_parse_devargs(struct rte_devargs *devargs, struct cn10k_ml_dev *mlde
 	}
 	plt_info("ML: %s = %d", CN10K_ML_DEV_CACHE_MODEL_DATA, mldev->cache_model_data);
 
+	if (!ocm_alloc_mode_set) {
+		mldev->ocm.alloc_mode = CN10K_ML_OCM_ALLOC_MODE_DEFAULT;
+	} else {
+		if (!((strcmp(ocm_alloc_mode, "lowest") == 0) ||
+		      (strcmp(ocm_alloc_mode, "largest") == 0))) {
+			plt_err("Invalid argument, %s = %s\n", CN10K_ML_OCM_ALLOC_MODE,
+				ocm_alloc_mode);
+			ret = -EINVAL;
+			goto exit;
+		}
+		mldev->ocm.alloc_mode = ocm_alloc_mode;
+	}
+	plt_info("ML: %s = %s", CN10K_ML_OCM_ALLOC_MODE, mldev->ocm.alloc_mode);
+
 exit:
 	if (kvlist)
 		rte_kvargs_free(kvlist);
@@ -720,7 +752,8 @@ RTE_PMD_REGISTER_PCI(MLDEV_NAME_CN10K_PMD, cn10k_mldev_pmd);
 RTE_PMD_REGISTER_PCI_TABLE(MLDEV_NAME_CN10K_PMD, pci_id_ml_table);
 RTE_PMD_REGISTER_KMOD_DEP(MLDEV_NAME_CN10K_PMD, "vfio-pci");
 
-RTE_PMD_REGISTER_PARAM_STRING(MLDEV_NAME_CN10K_PMD,
-			      CN10K_ML_FW_PATH "=<path>" CN10K_ML_FW_ENABLE_DPE_WARNINGS
-					       "=<0|1>" CN10K_ML_FW_REPORT_DPE_WARNINGS
-					       "=<0|1>" CN10K_ML_DEV_CACHE_MODEL_DATA "=<0|1>");
+RTE_PMD_REGISTER_PARAM_STRING(MLDEV_NAME_CN10K_PMD, CN10K_ML_FW_PATH
+			      "=<path>" CN10K_ML_FW_ENABLE_DPE_WARNINGS
+			      "=<0|1>" CN10K_ML_FW_REPORT_DPE_WARNINGS
+			      "=<0|1>" CN10K_ML_DEV_CACHE_MODEL_DATA
+			      "=<0|1>" CN10K_ML_OCM_ALLOC_MODE "=<lowest|largest>");
diff --git a/drivers/ml/cnxk/cn10k_ml_ocm.c b/drivers/ml/cnxk/cn10k_ml_ocm.c
index 0b04fcc2da..551faef7eb 100644
--- a/drivers/ml/cnxk/cn10k_ml_ocm.c
+++ b/drivers/ml/cnxk/cn10k_ml_ocm.c
@@ -230,7 +230,6 @@ cn10k_ml_ocm_tilemask_find(struct rte_ml_dev *dev, uint8_t num_tiles, uint16_t w
 	int wb_page_start_curr;
 	int max_slot_sz_curr;
 	uint8_t tile_start;
-	int ocm_alloc_mode;
 	int wb_page_start;
 	uint16_t tile_id;
 	uint16_t word_id;
@@ -255,7 +254,6 @@ cn10k_ml_ocm_tilemask_find(struct rte_ml_dev *dev, uint8_t num_tiles, uint16_t w
 	max_slot_sz_curr = 0;
 	max_slot_sz = 0;
 	tile_idx = 0;
-	ocm_alloc_mode = 2;
 
 	if ((start_tile != -1) && (start_tile % num_tiles != 0)) {
 		plt_err("Invalid start_tile, %d", start_tile);
@@ -303,13 +301,13 @@ cn10k_ml_ocm_tilemask_find(struct rte_ml_dev *dev, uint8_t num_tiles, uint16_t w
 		}
 	}
 
-	if (ocm_alloc_mode == 1) {
+	if (strcmp(ocm->alloc_mode, "lowest") == 0) {
 		wb_page_start = slot_index_lowest(local_ocm_mask, ocm->mask_words, wb_pages, 0);
 		if (wb_page_start != -1) { /* Have a valid slot for WB, else next set of tiles */
 			tile_idx = tile_start;
 			goto found;
 		}
-	} else if (ocm_alloc_mode == 2) {
+	} else if (strcmp(ocm->alloc_mode, "largest") == 0) {
 		wb_page_start_curr = slot_index_largest(local_ocm_mask, ocm->mask_words, wb_pages,
 							&max_slot_sz_curr);
 		if (max_slot_sz_curr > max_slot_sz) {
diff --git a/drivers/ml/cnxk/cn10k_ml_ocm.h b/drivers/ml/cnxk/cn10k_ml_ocm.h
index 0c7172a671..5f018b410a 100644
--- a/drivers/ml/cnxk/cn10k_ml_ocm.h
+++ b/drivers/ml/cnxk/cn10k_ml_ocm.h
@@ -58,6 +58,9 @@ struct cn10k_ml_ocm {
 	/* OCM spinlock, used to update OCM state */
 	rte_spinlock_t lock;
 
+	/* OCM allocation mode */
+	const char *alloc_mode;
+
 	/* Number of OCM tiles */
 	uint8_t num_tiles;
 
-- 
2.17.1