Mbus
MSI（Memory System Interconnet）是SoC系统中统筹所有模块访问dram的总线互联器。MSI支持AXI、MBUS、MBUS和MSB接口，各种接口的数量单独可配，为各个模块提供高效的存储交互。MSI具有以下特点
- 优先级控制
- 带宽监控
- 数据加扰
- 安全控制功能
其中的Mbus模块提供给用户使用的包括总线使能和获取带宽接口。
模块配置
配置路径如下:
Kernel Setup --->
Drivers Setup --->
SoC HAL Drivers --->
MBUS Devices --->
[*] enable mbus driver
源码结构
rtos-hal/
|-- hal/source/mbus/hal_mbus.c // hal层接口代码
|-- include/hal/sunxi_hal_mbus.h // 头文件
模块接口介绍
Mbus 获取带宽枚举
/* MBUS PMU ids */
enum mbus_pmu {
MBUS_PMU_CPU = 0, /* CPU bandwidth */
MBUS_PMU_GPU, /* GPU bandwidth */
MBUS_PMU_VE, /* VE */
MBUS_PMU_DISP, /* DISPLAY */
MBUS_PMU_OTH, /* other masters */
MBUS_PMU_TOTAL, /* total masters */
MBUS_PMU_RV_SYS, /* RV_SYS */
MBUS_PMU_CE, /* CE */
MBUS_PMU_DE, /* DE */
MBUS_PMU_G2D, /* G2D */
MBUS_PMU_TVD, /* TVD */
MBUS_PMU_CSI, /* CSI */
MBUS_PMU_DSP_SYS, /* DSP_SYS */
MBUS_PMU_DI, /* DI */
MBUS_PMU_IOMMU, /* IOMMU */
MBUS_PMU_DMA0, /* DMA0 */
MBUS_PMU_DMA1, /* DMA1 */
MBUS_PMU_MAHB, /* MAHB */
};
返回值枚举
typedef enum{
HAL_MBUS_STATUS_ERROR_PARAMETER = -3,
HAL_MBUS_STATUS_ERROR_CHANNEL = -2,
HAL_MBUS_STATUS_ERROR = -1,
HAL_MBUS_STATUS_OK = 0
}hal_mbus_status_t;
Mbus 总线使能接口
使能Mbus总线
函数原型：
hal_mbus_status_t hal_mbus_pmu_enable(void);
参数：
- 无
返回值：
- 参考hal_mbus_status_t枚举
获取带宽接口
获取不同模块在总线上的带宽
函数原型：
hal_mbus_status_t hal_mbus_pmu_get_value(enum mbus_pmu type, unsigned int *value);
参数：
- type：模块类型
- value，保存获取的带宽数据
返回值：
- 参考hal_mbus_status_t枚举
模块使用范例
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <hal_cmd.h>
#include <sunxi_hal_mbus.h>
int cmd_mbus(int argc, char **argv)
{
int cnt = 1;
int ms_delay = 0;
int windows_us;
uint32_t cpu_value = 0, gpu_value = 0, ve_value = 0, disp_value = 0;
uint32_t total_value = 0, di_value = 0, oth_value = 0, csi_value = 0;
uint32_t tvd_value = 0, g2d_value = 0, iommu_value = 0, rv_value = 0;
uint32_t dsp_value = 0, dma0_value = 0, dma1_value = 0, de_value = 0;
uint32_t ce_value = 0, mahb_value = 0,rv_sys_value = 0;
printf("============MBUS TEST===============\n");
hal_mbus_pmu_enable();
if (argc >= 2)
cnt = atoi(argv[1]);
if (argc >= 3)
ms_delay = atoi(argv[2]);
printf("the bus bandwidth occupancy status is :\n");
while (cnt--) {
hal_mbus_pmu_get_value(MBUS_PMU_CPU, &cpu_value);
hal_mbus_pmu_get_value(MBUS_PMU_GPU, &gpu_value);
hal_mbus_pmu_get_value(MBUS_PMU_RV_SYS, &rv_sys_value);
hal_mbus_pmu_get_value(MBUS_PMU_VE, &ve_value);
hal_mbus_pmu_get_value(MBUS_PMU_DISP, &disp_value);
hal_mbus_pmu_get_value(MBUS_PMU_OTH, &oth_value);
hal_mbus_pmu_get_value(MBUS_PMU_CE, &ce_value);
hal_mbus_pmu_get_value(MBUS_PMU_DI, &di_value);
hal_mbus_pmu_get_value(MBUS_PMU_DE, &de_value);
hal_mbus_pmu_get_value(MBUS_PMU_CSI, &csi_value);
hal_mbus_pmu_get_value(MBUS_PMU_TVD, &tvd_value);
hal_mbus_pmu_get_value(MBUS_PMU_G2D, &g2d_value);
hal_mbus_pmu_get_value(MBUS_PMU_IOMMU, &iommu_value);
hal_mbus_pmu_get_value(MBUS_PMU_RV_SYS, &rv_value);
hal_mbus_pmu_get_value(MBUS_PMU_DSP_SYS, &dsp_value);
hal_mbus_pmu_get_value(MBUS_PMU_DMA0, &dma0_value);
hal_mbus_pmu_get_value(MBUS_PMU_DMA1, &dma1_value);
hal_mbus_pmu_get_value(MBUS_PMU_MAHB, &mahb_value);
hal_mbus_pmu_get_value(MBUS_PMU_TOTAL, &total_value); //mbus calculate bw every window time, total is the max one
hal_mbus_pmu_get_window(&windows_us);
printf("window(us) maxbw(k) cpu gpu ve disp di csi tvd g2d iommu rv dsp dma0 dma1 cd de mahb others rv_sys\n");
printf("%-10d %-8d %-8d %-8d %-8d %-8d %-8d %-8d %-8d %-8d %-8d %-8d %-8d %-8d %-8d %-8d %-8d %-8d %-8d %-8d\n",\
windows_us , total_value, cpu_value, gpu_value, ve_value, disp_value,\
di_value, csi_value, tvd_value, g2d_value, iommu_value,\
rv_value, dsp_value, dma0_value, dma1_value, ce_value,\
de_value, mahb_value, oth_value,rv_sys_value);
if (cnt && ms_delay)
mdelay(ms_delay);
}
return 0;
}
FINSH_FUNCTION_EXPORT_CMD(cmd_mbus, mbus_test, Mbus hal APIs tests);
int cmd_mbus_enable(int argc, char **argv)
{
hal_mbus_pmu_enable();
return 0;
}
FINSH_FUNCTION_EXPORT_CMD(cmd_mbus_enable, mbus_enable, Mbus hal enable APIs tests);
int cmd_mbus_value(int argc, char **argv)
{
int cnt = 1;
int ms_delay = 0;
int windows_us;
uint32_t cpu_value = 0, gpu_value = 0, ve_value = 0, disp_value = 0;
uint32_t total_value = 0, di_value = 0, oth_value = 0, csi_value = 0;
uint32_t tvd_value = 0, g2d_value = 0, iommu_value = 0, rv_value = 0;
uint32_t dsp_value = 0, dma0_value = 0, dma1_value = 0, de_value = 0;
uint32_t ce_value = 0, mahb_value = 0,rv_sys_value = 0;
if (argc >= 2)
cnt = atoi(argv[1]);
if (argc >= 3)
ms_delay = atoi(argv[2]);
printf("the bus bandwidth occupancy status is :\n");
while (cnt--) {
hal_mbus_pmu_get_value(MBUS_PMU_CPU, &cpu_value);
hal_mbus_pmu_get_value(MBUS_PMU_GPU, &gpu_value);
hal_mbus_pmu_get_value(MBUS_PMU_VE, &ve_value);
hal_mbus_pmu_get_value(MBUS_PMU_DISP, &disp_value);
hal_mbus_pmu_get_value(MBUS_PMU_OTH, &oth_value);
hal_mbus_pmu_get_value(MBUS_PMU_CE, &ce_value);
hal_mbus_pmu_get_value(MBUS_PMU_DI, &di_value);
hal_mbus_pmu_get_value(MBUS_PMU_DE, &de_value);
hal_mbus_pmu_get_value(MBUS_PMU_CSI, &csi_value);
hal_mbus_pmu_get_value(MBUS_PMU_TVD, &tvd_value);
hal_mbus_pmu_get_value(MBUS_PMU_G2D, &g2d_value);
hal_mbus_pmu_get_value(MBUS_PMU_IOMMU, &iommu_value);
hal_mbus_pmu_get_value(MBUS_PMU_RV_SYS, &rv_value);
hal_mbus_pmu_get_value(MBUS_PMU_DSP_SYS, &dsp_value);
hal_mbus_pmu_get_value(MBUS_PMU_DMA0, &dma0_value);
hal_mbus_pmu_get_value(MBUS_PMU_DMA1, &dma1_value);
hal_mbus_pmu_get_value(MBUS_PMU_MAHB, &mahb_value);
hal_mbus_pmu_get_value(MBUS_PMU_TOTAL, &total_value); //mbus calculate bw every window time, total is the max one
hal_mbus_pmu_get_window(&windows_us);
printf("window(us) maxbw(k) cpu gpu ve disp di csi tvd g2d iommu rv dsp dma0 dma1 cd de mahb others \n");
printf("%-10d %-8d %-8d %-8d %-8d %-8d %-8d %-8d %-8d %-8d %-8d 0x%08x %-8d %-8d %-8d %-8d %-8d %-8d %-8d \n",\
windows_us , total_value, cpu_value, gpu_value, ve_value, disp_value,\
di_value, csi_value, tvd_value, g2d_value, iommu_value,\
rv_value, dsp_value, dma0_value, dma1_value, ce_value,\
de_value, mahb_value, oth_value);
if (cnt && ms_delay)
mdelay(ms_delay);
}
return 0;
}
FINSH_FUNCTION_EXPORT_CMD(cmd_mbus_value, mbus_test_value, Mbus hal value APIs tests);