Apply some optimizations to speed up bitstream loading (both for full and split periph/core bitstreams):
* Change the size of the first fs read, so that all the subsequent reads are aligned to a specific value (called MAX_FIRST_LOAD_SIZE). This value was chosen so that in subsequent reads the fat fs driver doesn't have to allocate a temporary buffer in get_contents (assuming 8KiB clusters).
* Change the buffer size to a larger value when reading to ddr (but not too large, because large transfers cause a stack overflow in the dwmmc driver).
Signed-off-by: Paweł Anikiel pan@semihalf.com --- drivers/fpga/socfpga_arria10.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-)
diff --git a/drivers/fpga/socfpga_arria10.c b/drivers/fpga/socfpga_arria10.c index 798e3a3f90..07bfe3060e 100644 --- a/drivers/fpga/socfpga_arria10.c +++ b/drivers/fpga/socfpga_arria10.c @@ -30,6 +30,14 @@ #define FPGA_TIMEOUT_MSEC 1000 /* timeout in ms */ #define FPGA_TIMEOUT_CNT 0x1000000 #define DEFAULT_DDR_LOAD_ADDRESS 0x400 +#define DDR_BUFFER_SIZE 0x100000 + +/* When reading bitstream from a filesystem, the size of the first read is + * changed so that the subsequent reads are aligned to this value. This value + * was chosen so that in subsequent reads the fat fs driver doesn't have to + * allocate a temporary buffer in get_contents (assuming 8KiB clusters). + */ +#define MAX_FIRST_LOAD_SIZE 0x2000
DECLARE_GLOBAL_DATA_PTR;
@@ -526,7 +534,8 @@ static void get_rbf_image_info(struct rbf_info *rbf, u16 *buffer) #ifdef CONFIG_FS_LOADER static int first_loading_rbf_to_buffer(struct udevice *dev, struct fpga_loadfs_info *fpga_loadfs, - u32 *buffer, size_t *buffer_bsize) + u32 *buffer, size_t *buffer_bsize, + size_t *buffer_bsize_ori) { u32 *buffer_p = (u32 *)*buffer; u32 *loadable = buffer_p; @@ -674,6 +683,7 @@ static int first_loading_rbf_to_buffer(struct udevice *dev, }
buffer_size = rbf_size; + *buffer_bsize_ori = DDR_BUFFER_SIZE; }
debug("FPGA: External data: offset = 0x%x, size = 0x%x.\n", @@ -686,11 +696,16 @@ static int first_loading_rbf_to_buffer(struct udevice *dev, * chunk by chunk transfer is required due to smaller buffer size * compare to bitstream */ + + if (buffer_size > MAX_FIRST_LOAD_SIZE) + buffer_size = MAX_FIRST_LOAD_SIZE; + if (rbf_size <= buffer_size) { /* Loading whole bitstream into buffer */ buffer_size = rbf_size; fpga_loadfs->remaining = 0; } else { + buffer_size -= rbf_offset % buffer_size; fpga_loadfs->remaining -= buffer_size; }
@@ -806,7 +821,8 @@ int socfpga_loadfs(fpga_fs_info *fpga_fsinfo, const void *buf, size_t bsize, * function below. */ ret = first_loading_rbf_to_buffer(dev, &fpga_loadfs, &buffer, - &buffer_sizebytes); + &buffer_sizebytes, + &buffer_sizebytes_ori); if (ret == 1) { printf("FPGA: Skipping configuration ...\n"); return 0;