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socfpga: arria10: Improve bitstream loading speed

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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>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Paweł Anikiel 2022-06-17 12:47:24 +02:00 • committed by Tien Fong Chee
parent aea0e80a9f
commit 8b1eee3730
1 changed files with 18 additions and 2 deletions
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20
drivers/fpga/socfpga_arria10.c
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@ -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;