net/mlx5: FW tracer, create trace buffer and copy strings database

For each PF do the following:
1- Allocate memory for the tracer strings database and read the
strings from the FW to the SW. These strings will be used later for
parsing traces.
2- Allocate and dma map tracer buffers.

Traces that will be written into the buffer will be parsed as a group
of one or more traces, referred to as trace message. The trace message
represents a C-like printf string.
First trace of a message holds the pointer to the correct string in
strings database. The following traces holds the variables of the
message.

Signed-off-by: Feras Daoud <ferasda@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c b/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
index 3ecbf06..35107b8 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
@@ -119,6 +119,163 @@ static void mlx5_fw_tracer_ownership_release(struct mlx5_fw_tracer *tracer)
        tracer->owner = false;
 }
 
+static int mlx5_fw_tracer_create_log_buf(struct mlx5_fw_tracer *tracer)
+{
+       struct mlx5_core_dev *dev = tracer->dev;
+       struct device *ddev = &dev->pdev->dev;
+       dma_addr_t dma;
+       void *buff;
+       gfp_t gfp;
+       int err;
+
+       tracer->buff.size = TRACE_BUFFER_SIZE_BYTE;
+
+       gfp = GFP_KERNEL | __GFP_ZERO;
+       buff = (void *)__get_free_pages(gfp,
+                                       get_order(tracer->buff.size));
+       if (!buff) {
+               err = -ENOMEM;
+               mlx5_core_warn(dev, "FWTracer: Failed to allocate pages, %d\n", err);
+               return err;
+       }
+       tracer->buff.log_buf = buff;
+
+       dma = dma_map_single(ddev, buff, tracer->buff.size, DMA_FROM_DEVICE);
+       if (dma_mapping_error(ddev, dma)) {
+               mlx5_core_warn(dev, "FWTracer: Unable to map DMA: %d\n",
+                              dma_mapping_error(ddev, dma));
+               err = -ENOMEM;
+               goto free_pages;
+       }
+       tracer->buff.dma = dma;
+
+       return 0;
+
+free_pages:
+       free_pages((unsigned long)tracer->buff.log_buf, get_order(tracer->buff.size));
+
+       return err;
+}
+
+static void mlx5_fw_tracer_destroy_log_buf(struct mlx5_fw_tracer *tracer)
+{
+       struct mlx5_core_dev *dev = tracer->dev;
+       struct device *ddev = &dev->pdev->dev;
+
+       if (!tracer->buff.log_buf)
+               return;
+
+       dma_unmap_single(ddev, tracer->buff.dma, tracer->buff.size, DMA_FROM_DEVICE);
+       free_pages((unsigned long)tracer->buff.log_buf, get_order(tracer->buff.size));
+}
+
+static void mlx5_fw_tracer_free_strings_db(struct mlx5_fw_tracer *tracer)
+{
+       u32 num_string_db = tracer->str_db.num_string_db;
+       int i;
+
+       for (i = 0; i < num_string_db; i++) {
+               kfree(tracer->str_db.buffer[i]);
+               tracer->str_db.buffer[i] = NULL;
+       }
+}
+
+static int mlx5_fw_tracer_allocate_strings_db(struct mlx5_fw_tracer *tracer)
+{
+       u32 *string_db_size_out = tracer->str_db.size_out;
+       u32 num_string_db = tracer->str_db.num_string_db;
+       int i;
+
+       for (i = 0; i < num_string_db; i++) {
+               tracer->str_db.buffer[i] = kzalloc(string_db_size_out[i], GFP_KERNEL);
+               if (!tracer->str_db.buffer[i])
+                       goto free_strings_db;
+       }
+
+       return 0;
+
+free_strings_db:
+       mlx5_fw_tracer_free_strings_db(tracer);
+       return -ENOMEM;
+}
+
+static void mlx5_tracer_read_strings_db(struct work_struct *work)
+{
+       struct mlx5_fw_tracer *tracer = container_of(work, struct mlx5_fw_tracer,
+                                                    read_fw_strings_work);
+       u32 num_of_reads, num_string_db = tracer->str_db.num_string_db;
+       struct mlx5_core_dev *dev = tracer->dev;
+       u32 in[MLX5_ST_SZ_DW(mtrc_cap)] = {0};
+       u32 leftovers, offset;
+       int err = 0, i, j;
+       u32 *out, outlen;
+       void *out_value;
+
+       outlen = MLX5_ST_SZ_BYTES(mtrc_stdb) + STRINGS_DB_READ_SIZE_BYTES;
+       out = kzalloc(outlen, GFP_KERNEL);
+       if (!out) {
+               err = -ENOMEM;
+               goto out;
+       }
+
+       for (i = 0; i < num_string_db; i++) {
+               offset = 0;
+               MLX5_SET(mtrc_stdb, in, string_db_index, i);
+               num_of_reads = tracer->str_db.size_out[i] /
+                               STRINGS_DB_READ_SIZE_BYTES;
+               leftovers = (tracer->str_db.size_out[i] %
+                               STRINGS_DB_READ_SIZE_BYTES) /
+                                       STRINGS_DB_LEFTOVER_SIZE_BYTES;
+
+               MLX5_SET(mtrc_stdb, in, read_size, STRINGS_DB_READ_SIZE_BYTES);
+               for (j = 0; j < num_of_reads; j++) {
+                       MLX5_SET(mtrc_stdb, in, start_offset, offset);
+
+                       err = mlx5_core_access_reg(dev, in, sizeof(in), out,
+                                                  outlen, MLX5_REG_MTRC_STDB,
+                                                  0, 1);
+                       if (err) {
+                               mlx5_core_dbg(dev, "FWTracer: Failed to read strings DB %d\n",
+                                             err);
+                               goto out_free;
+                       }
+
+                       out_value = MLX5_ADDR_OF(mtrc_stdb, out, string_db_data);
+                       memcpy(tracer->str_db.buffer[i] + offset, out_value,
+                              STRINGS_DB_READ_SIZE_BYTES);
+                       offset += STRINGS_DB_READ_SIZE_BYTES;
+               }
+
+               /* Strings database is aligned to 64, need to read leftovers*/
+               MLX5_SET(mtrc_stdb, in, read_size,
+                        STRINGS_DB_LEFTOVER_SIZE_BYTES);
+               for (j = 0; j < leftovers; j++) {
+                       MLX5_SET(mtrc_stdb, in, start_offset, offset);
+
+                       err = mlx5_core_access_reg(dev, in, sizeof(in), out,
+                                                  outlen, MLX5_REG_MTRC_STDB,
+                                                  0, 1);
+                       if (err) {
+                               mlx5_core_dbg(dev, "FWTracer: Failed to read strings DB %d\n",
+                                             err);
+                               goto out_free;
+                       }
+
+                       out_value = MLX5_ADDR_OF(mtrc_stdb, out, string_db_data);
+                       memcpy(tracer->str_db.buffer[i] + offset, out_value,
+                              STRINGS_DB_LEFTOVER_SIZE_BYTES);
+                       offset += STRINGS_DB_LEFTOVER_SIZE_BYTES;
+               }
+       }
+
+       tracer->str_db.loaded = true;
+
+out_free:
+       kfree(out);
+out:
+       return;
+}
+
 static void mlx5_fw_tracer_ownership_change(struct work_struct *work)
 {
        struct mlx5_fw_tracer *tracer = container_of(work, struct mlx5_fw_tracer,
@@ -161,6 +318,7 @@ struct mlx5_fw_tracer *mlx5_fw_tracer_create(struct mlx5_core_dev *dev)
        tracer->dev = dev;
 
        INIT_WORK(&tracer->ownership_change_work, mlx5_fw_tracer_ownership_change);
+       INIT_WORK(&tracer->read_fw_strings_work, mlx5_tracer_read_strings_db);
 
        err = mlx5_query_mtrc_caps(tracer);
        if (err) {
@@ -168,10 +326,22 @@ struct mlx5_fw_tracer *mlx5_fw_tracer_create(struct mlx5_core_dev *dev)
                goto destroy_workqueue;
        }
 
-       mlx5_fw_tracer_ownership_change(&tracer->ownership_change_work);
+       err = mlx5_fw_tracer_create_log_buf(tracer);
+       if (err) {
+               mlx5_core_warn(dev, "FWTracer: Create log buffer failed %d\n", err);
+               goto destroy_workqueue;
+       }
+
+       err = mlx5_fw_tracer_allocate_strings_db(tracer);
+       if (err) {
+               mlx5_core_warn(dev, "FWTracer: Allocate strings database failed %d\n", err);
+               goto free_log_buf;
+       }
 
        return tracer;
 
+free_log_buf:
+       mlx5_fw_tracer_destroy_log_buf(tracer);
 destroy_workqueue:
        tracer->dev = NULL;
        destroy_workqueue(tracer->work_queue);
@@ -180,17 +350,50 @@ free_tracer:
        return ERR_PTR(err);
 }
 
-void mlx5_fw_tracer_destroy(struct mlx5_fw_tracer *tracer)
+int mlx5_fw_tracer_init(struct mlx5_fw_tracer *tracer)
 {
-       if (!tracer)
+       struct mlx5_core_dev *dev;
+       int err;
+
+       if (IS_ERR_OR_NULL(tracer))
+               return 0;
+
+       dev = tracer->dev;
+
+       if (!tracer->str_db.loaded)
+               queue_work(tracer->work_queue, &tracer->read_fw_strings_work);
+
+       err = mlx5_fw_tracer_ownership_acquire(tracer);
+       if (err) {
+               mlx5_core_dbg(dev, "FWTracer: Ownership was not granted %d\n", err);
+               return 0; /* return 0 since ownership can be acquired on a later FW event */
+       }
+
+       return 0;
+}
+
+void mlx5_fw_tracer_cleanup(struct mlx5_fw_tracer *tracer)
+{
+       if (IS_ERR_OR_NULL(tracer))
                return;
 
        cancel_work_sync(&tracer->ownership_change_work);
 
        if (tracer->owner)
                mlx5_fw_tracer_ownership_release(tracer);
+}
 
+void mlx5_fw_tracer_destroy(struct mlx5_fw_tracer *tracer)
+{
+       if (IS_ERR_OR_NULL(tracer))
+               return;
+
+       cancel_work_sync(&tracer->read_fw_strings_work);
+       mlx5_fw_tracer_free_strings_db(tracer);
+       mlx5_fw_tracer_destroy_log_buf(tracer);
        flush_workqueue(tracer->work_queue);
        destroy_workqueue(tracer->work_queue);
        kfree(tracer);
 }
+
+EXPORT_TRACEPOINT_SYMBOL(mlx5_fw);

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.h b/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.h
index 721c41a..66cb7e7 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.h
@@ -37,6 +37,11 @@
 #include "mlx5_core.h"
 
 #define STRINGS_DB_SECTIONS_NUM 8
+#define STRINGS_DB_READ_SIZE_BYTES 256
+#define STRINGS_DB_LEFTOVER_SIZE_BYTES 64
+#define TRACER_BUFFER_PAGE_NUM 64
+#define TRACER_BUFFER_CHUNK 4096
+#define TRACE_BUFFER_SIZE_BYTE (TRACER_BUFFER_PAGE_NUM * TRACER_BUFFER_CHUNK)
 
 struct mlx5_fw_tracer {
        struct mlx5_core_dev *dev;
@@ -44,6 +49,7 @@ struct mlx5_fw_tracer {
        u8   trc_ver;
        struct workqueue_struct *work_queue;
        struct work_struct ownership_change_work;
+       struct work_struct read_fw_strings_work;
 
        /* Strings DB */
        struct {
@@ -52,7 +58,19 @@ struct mlx5_fw_tracer {
                u32 num_string_db;
                u32 base_address_out[STRINGS_DB_SECTIONS_NUM];
                u32 size_out[STRINGS_DB_SECTIONS_NUM];
+               void *buffer[STRINGS_DB_SECTIONS_NUM];
+               bool loaded;
        } str_db;
+
+       /* Log Buffer */
+       struct {
+               u32 pdn;
+               void *log_buf;
+               dma_addr_t dma;
+               u32 size;
+               struct mlx5_core_mkey mkey;
+
+       } buff;
 };
 
 enum mlx5_fw_tracer_ownership_state {