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DM USB: dynamically allocate block count for struct usb_xfer

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The block count of the struct usb_xfer is hard coded by the macro
USB_MAX_XFER_BLOCKS (1024), it wastes memory if 1024 blocks are
allocated for low speed transfer such as control transfer or interrupt
transfer. This patch introduces a new method to allocate different
number of blocks according to different endpoint type.

Tracked-On: #3628
Signed-off-by: Xiaoguang Wu <xiaoguang.wu@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>
This commit is contained in:
Xiaoguang Wu
2019-08-27 22:28:18 +08:00
committed by wenlingz
parent f1b142e6e0
commit 06781b37e9
6 changed files with 95 additions and 42 deletions
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4
devicemodel/hw/usb_core.c
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@@ -106,7 +106,7 @@ usb_block_append(struct usb_xfer *xfer, void *buf, int blen, void *hcb,
{
struct usb_block *xb;
if (xfer->ndata >= USB_MAX_XFER_BLOCKS)
if (xfer->ndata >= xfer->max_blk_cnt)
return NULL;
if (hcb == NULL)
@@ -120,7 +120,7 @@ usb_block_append(struct usb_xfer *xfer, void *buf, int blen, void *hcb,
xb->bdone = 0;
xb->type = USB_DATA_NONE;
xfer->ndata++;
xfer->tail = index_inc(xfer->tail, USB_MAX_XFER_BLOCKS);
xfer->tail = index_inc(xfer->tail, xfer->max_blk_cnt);
return xb;
}