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author | Michael Tretter <m.tretter@pengutronix.de> | 2021-08-19 10:12:50 +0200 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2021-08-23 15:51:36 +0200 |
commit | 52bc1b99afbf4acced704ce67130455ee0f882a7 (patch) | |
tree | 59ada8d9f7886ad1afc10ae019144640bd1da896 | |
parent | 3b1ac08954d4518e019331fb34ba9b0677055145 (diff) | |
download | barebox-52bc1b99afbf4acced704ce67130455ee0f882a7.tar.gz barebox-52bc1b99afbf4acced704ce67130455ee0f882a7.tar.xz |
firmware: zynqmp-fpga: avoid additional buffer for size argument
There are two different APIs for loading an FPGA via the pmu-fw as
indicated by the ZYNQMP_PM_FEATURE_SIZE_NOT_NEEDED feature flag.
The pmu-fw expects as second argument either the size of the bitstream or a
pointer to the size of the bitstream.
The driver allocates a separate buffer for the size, which results in
the allocation of a 4k page for storing a 32 bit value.
Allocate some more memory for the bitstream and append the size of the
bitstream at the end of the bitstream to avoid the additional memory
allocation.
Add a comment to explain the surprising size of the allocation.
Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Link: https://lore.barebox.org/20210819081251.726840-3-m.tretter@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
-rw-r--r-- | drivers/firmware/zynqmp-fpga.c | 37 |
1 files changed, 16 insertions, 21 deletions
diff --git a/drivers/firmware/zynqmp-fpga.c b/drivers/firmware/zynqmp-fpga.c index 736d1950fa..667910479a 100644 --- a/drivers/firmware/zynqmp-fpga.c +++ b/drivers/firmware/zynqmp-fpga.c @@ -197,8 +197,8 @@ static void zynqmp_fpga_show_header(const struct device_d *dev, static int fpgamgr_program_finish(struct firmware_handler *fh) { struct fpgamgr *mgr = container_of(fh, struct fpgamgr, fh); - char *buf_aligned; - u32 *buf_size = NULL; + u32 *buf_aligned; + u32 buf_size; u32 *body; size_t body_length; int header_length = 0; @@ -234,17 +234,14 @@ static int fpgamgr_program_finish(struct firmware_handler *fh) goto err_free; } - if (!(mgr->features & ZYNQMP_PM_FEATURE_SIZE_NOT_NEEDED)) { - buf_size = dma_alloc_coherent(sizeof(*buf_size), - DMA_ADDRESS_BROKEN); - if (!buf_size) { - status = -ENOBUFS; - goto err_free; - } - *buf_size = body_length; - } - - buf_aligned = dma_alloc_coherent(body_length, DMA_ADDRESS_BROKEN); + /* + * The PMU FW variants without the ZYNQMP_PM_FEATURE_SIZE_NOT_NEEDED + * feature expect a pointer to the bitstream size, which is stored in + * memory. Allocate some extra space at the end of the buffer for the + * bitstream size. + */ + buf_aligned = dma_alloc_coherent(body_length + sizeof(buf_size), + DMA_ADDRESS_BROKEN); if (!buf_aligned) { status = -ENOBUFS; goto err_free; @@ -259,20 +256,18 @@ static int fpgamgr_program_finish(struct firmware_handler *fh) addr = (u64)buf_aligned; - if (!(mgr->features & ZYNQMP_PM_FEATURE_SIZE_NOT_NEEDED) && buf_size) { - status = mgr->eemi_ops->fpga_load(addr, - (u32)(uintptr_t)buf_size, - flags); - dma_free_coherent(buf_size, 0, sizeof(*buf_size)); + if (mgr->features & ZYNQMP_PM_FEATURE_SIZE_NOT_NEEDED) { + buf_size = body_length; } else { - status = mgr->eemi_ops->fpga_load(addr, (u32)(body_length), - flags); + buf_aligned[body_length / sizeof(*buf_aligned)] = body_length; + buf_size = addr + body_length; } + status = mgr->eemi_ops->fpga_load(addr, buf_size, flags); if (status < 0) dev_err(&mgr->dev, "unable to load fpga\n"); - dma_free_coherent(buf_aligned, 0, body_length); + dma_free_coherent(buf_aligned, 0, body_length + sizeof(buf_size)); err_free: free(mgr->buf); |