From 049c1fb4fc2a45a51b51bf9abb24cd5fd1b3fcf3 Mon Sep 17 00:00:00 2001 From: Eli Billauer Date: Sat, 5 Jul 2014 12:45:08 +0300 Subject: [PATCH] staging: xillybus: Reorganizing xilly_setupchannels() Duplicate code in this function was moved into a new function, xilly_get_dma_buffers(). There is no change in functionality. Signed-off-by: Eli Billauer Signed-off-by: Greg Kroah-Hartman --- drivers/staging/xillybus/xillybus_core.c | 345 +++++++++-------------- 1 file changed, 138 insertions(+), 207 deletions(-) diff --git a/drivers/staging/xillybus/xillybus_core.c b/drivers/staging/xillybus/xillybus_core.c index fa799795f714..134800de13eb 100644 --- a/drivers/staging/xillybus/xillybus_core.c +++ b/drivers/staging/xillybus/xillybus_core.c @@ -319,28 +319,130 @@ EXPORT_SYMBOL(xillybus_isr); static void xillybus_autoflush(struct work_struct *work); +struct xilly_alloc_state { + void *salami; + int left_of_salami; + int nbuffer; + enum dma_data_direction direction; + u32 regdirection; +}; + +static int xilly_get_dma_buffers(struct xilly_endpoint *ep, + struct xilly_alloc_state *s, + struct xilly_buffer **buffers, + int bufnum, int bytebufsize) +{ + int i, rc; + dma_addr_t dma_addr; + struct device *dev = ep->dev; + struct xilly_buffer *this_buffer = NULL; /* Init to silence warning */ + + if (buffers) { /* Not the message buffer */ + this_buffer = devm_kzalloc( + dev, bufnum * sizeof(struct xilly_buffer), + GFP_KERNEL); + + if (!this_buffer) + return -ENOMEM; + } + + for (i = 0; i < bufnum; i++) { + /* + * Buffers are expected in descending size order, so there + * is either enough space for this buffer or none at all. + */ + + if ((s->left_of_salami < bytebufsize) && + (s->left_of_salami > 0)) { + dev_err(ep->dev, + "Corrupt buffer allocation in IDT. Aborting.\n"); + return -ENODEV; + } + + if (s->left_of_salami == 0) { + int allocorder, allocsize; + + allocsize = PAGE_SIZE; + allocorder = 0; + while (bytebufsize > allocsize) { + allocsize *= 2; + allocorder++; + } + + s->salami = (void *) devm_get_free_pages( + dev, + GFP_KERNEL | __GFP_DMA32 | __GFP_ZERO, + allocorder); + + if (!s->salami) + return -ENOMEM; + s->left_of_salami = allocsize; + } + + rc = ep->ephw->map_single(ep, s->salami, + bytebufsize, s->direction, + &dma_addr); + + if (rc) + return rc; + + iowrite32((u32) (dma_addr & 0xffffffff), + &ep->registers[fpga_dma_bufaddr_lowaddr_reg]); + iowrite32(((u32) ((((u64) dma_addr) >> 32) & 0xffffffff)), + &ep->registers[fpga_dma_bufaddr_highaddr_reg]); + mmiowb(); + + if (buffers) { /* Not the message buffer */ + this_buffer->addr = s->salami; + this_buffer->dma_addr = dma_addr; + buffers[i] = this_buffer++; + + iowrite32(s->regdirection | s->nbuffer++, + &ep->registers[fpga_dma_bufno_reg]); + } else { + ep->msgbuf_addr = s->salami; + ep->msgbuf_dma_addr = dma_addr; + ep->msg_buf_size = bytebufsize; + + iowrite32(s->regdirection, + &ep->registers[fpga_dma_bufno_reg]); + } + + s->left_of_salami -= bytebufsize; + s->salami += bytebufsize; + } + return 0; /* Success */ +} + static int xilly_setupchannels(struct xilly_endpoint *ep, unsigned char *chandesc, int entries ) { struct device *dev = ep->dev; - int i, entry, wr_nbuffer, rd_nbuffer; + int i, entry, rc; struct xilly_channel *channel; int channelnum, bufnum, bufsize, format, is_writebuf; int bytebufsize; int synchronous, allowpartial, exclusive_open, seekable; int supports_nonempty; - void *wr_salami = NULL; - void *rd_salami = NULL; - int left_of_wr_salami = 0; - int left_of_rd_salami = 0; - dma_addr_t dma_addr; int msg_buf_done = 0; - const gfp_t gfp_mask = GFP_KERNEL | __GFP_DMA32 | __GFP_ZERO; - struct xilly_buffer *this_buffer = NULL; /* Init to silence warning */ - int rc = 0; + struct xilly_alloc_state rd_alloc = { + .salami = NULL, + .left_of_salami = 0, + .nbuffer = 1, + .direction = DMA_TO_DEVICE, + .regdirection = 0, + }; + + struct xilly_alloc_state wr_alloc = { + .salami = NULL, + .left_of_salami = 0, + .nbuffer = 1, + .direction = DMA_FROM_DEVICE, + .regdirection = 0x80000000, + }; channel = devm_kzalloc(dev, ep->num_channels * sizeof(struct xilly_channel), GFP_KERNEL); @@ -395,17 +497,9 @@ static int xilly_setupchannels(struct xilly_endpoint *ep, ep->channels[i] = channel++; } - /* - * The DMA buffer address update is atomic on the FPGA, so even if - * it was in the middle of sending messages to some buffer, changing - * the address is safe, since the data will go to either of the - * buffers. Not that this situation should occur at all anyhow. - */ - - wr_nbuffer = 1; - rd_nbuffer = 1; /* Buffer zero isn't used at all */ - for (entry = 0; entry < entries; entry++, chandesc += 4) { + struct xilly_buffer **buffers = NULL; + is_writebuf = chandesc[0] & 0x01; channelnum = (chandesc[0] >> 1) | ((chandesc[1] & 0x0f) << 7); format = (chandesc[1] >> 4) & 0x03; @@ -426,40 +520,35 @@ static int xilly_setupchannels(struct xilly_endpoint *ep, channel = ep->channels[channelnum]; /* NULL for msg channel */ - bytebufsize = bufsize << 2; /* Overwritten just below */ - - if (!is_writebuf) { - channel->num_rd_buffers = bufnum; + if (!is_writebuf || channelnum > 0) { channel->log2_element_size = ((format > 2) ? 2 : format); + bytebufsize = channel->rd_buf_size = bufsize * (1 << channel->log2_element_size); - channel->rd_allow_partial = allowpartial; - channel->rd_synchronous = synchronous; - channel->rd_exclusive_open = exclusive_open; - channel->seekable = seekable; - channel->rd_buffers = devm_kzalloc(dev, + buffers = devm_kzalloc(dev, bufnum * sizeof(struct xilly_buffer *), GFP_KERNEL); - if (!channel->rd_buffers) + if (!buffers) goto memfail; + } else + bytebufsize = bufsize << 2; - this_buffer = devm_kzalloc(dev, - bufnum * sizeof(struct xilly_buffer), - GFP_KERNEL); + if (!is_writebuf) { + channel->num_rd_buffers = bufnum; + channel->rd_allow_partial = allowpartial; + channel->rd_synchronous = synchronous; + channel->rd_exclusive_open = exclusive_open; + channel->seekable = seekable; - if (!this_buffer) - goto memfail; + channel->rd_buffers = buffers; + rc = xilly_get_dma_buffers(ep, &rd_alloc, buffers, + bufnum, bytebufsize); } - else if (channelnum > 0) { channel->num_wr_buffers = bufnum; - channel->log2_element_size = ((format > 2) ? - 2 : format); - bytebufsize = channel->wr_buf_size = bufsize * - (1 << channel->log2_element_size); channel->seekable = seekable; channel->wr_supports_nonempty = supports_nonempty; @@ -468,171 +557,17 @@ static int xilly_setupchannels(struct xilly_endpoint *ep, channel->wr_synchronous = synchronous; channel->wr_exclusive_open = exclusive_open; - channel->wr_buffers = devm_kzalloc(dev, - bufnum * sizeof(struct xilly_buffer *), - GFP_KERNEL); - - if (!channel->wr_buffers) - goto memfail; - - this_buffer = devm_kzalloc(dev, - bufnum * sizeof(struct xilly_buffer), - GFP_KERNEL); - - if (!this_buffer) - goto memfail; + channel->wr_buffers = buffers; + rc = xilly_get_dma_buffers(ep, &wr_alloc, buffers, + bufnum, bytebufsize); + } else { + rc = xilly_get_dma_buffers(ep, &wr_alloc, NULL, + bufnum, bytebufsize); + msg_buf_done++; } - /* - * Although daunting, we cut the chunks for read buffers - * from a different salami than the write buffers', - * possibly improving performance. - */ - - if (is_writebuf) - for (i = 0; i < bufnum; i++) { - /* - * Buffers are expected in descending - * byte-size order, so there is either - * enough for this buffer or none at all. - */ - if ((left_of_wr_salami < bytebufsize) && - (left_of_wr_salami > 0)) { - dev_err(ep->dev, - "Corrupt buffer allocation in IDT. Aborting.\n"); - return -ENODEV; - } - - if (left_of_wr_salami == 0) { - int allocorder, allocsize; - - allocsize = PAGE_SIZE; - allocorder = 0; - while (bytebufsize > allocsize) { - allocsize *= 2; - allocorder++; - } - - wr_salami = (void *) - devm_get_free_pages( - dev, gfp_mask, - allocorder); - - if (!wr_salami) - goto memfail; - left_of_wr_salami = allocsize; - } - - rc = ep->ephw->map_single(ep, wr_salami, - bytebufsize, - DMA_FROM_DEVICE, - &dma_addr); - - if (rc) - goto dmafail; - - iowrite32( - (u32) (dma_addr & 0xffffffff), - &ep->registers[ - fpga_dma_bufaddr_lowaddr_reg] - ); - iowrite32( - ((u32) ((((u64) dma_addr) >> 32) - & 0xffffffff)), - &ep->registers[ - fpga_dma_bufaddr_highaddr_reg] - ); - mmiowb(); - - if (channelnum > 0) { - this_buffer->addr = wr_salami; - this_buffer->dma_addr = dma_addr; - channel->wr_buffers[i] = this_buffer++; - - iowrite32( - 0x80000000 | wr_nbuffer++, - &ep->registers[ - fpga_dma_bufno_reg]); - } else { - ep->msgbuf_addr = wr_salami; - ep->msgbuf_dma_addr = dma_addr; - ep->msg_buf_size = bytebufsize; - msg_buf_done++; - - iowrite32( - 0x80000000, &ep->registers[ - fpga_dma_bufno_reg]); - } - - left_of_wr_salami -= bytebufsize; - wr_salami += bytebufsize; - } - else /* Read buffers */ - for (i = 0; i < bufnum; i++) { - /* - * Buffers are expected in descending - * byte-size order, so there is either - * enough for this buffer or none at all. - */ - if ((left_of_rd_salami < bytebufsize) && - (left_of_rd_salami > 0)) { - dev_err(ep->dev, - "Corrupt buffer allocation in IDT. Aborting.\n"); - return -ENODEV; - } - - if (left_of_rd_salami == 0) { - int allocorder, allocsize; - - allocsize = PAGE_SIZE; - allocorder = 0; - while (bytebufsize > allocsize) { - allocsize *= 2; - allocorder++; - } - - rd_salami = (void *) - devm_get_free_pages( - dev, gfp_mask, - allocorder); - - if (!rd_salami) - goto memfail; - left_of_rd_salami = allocsize; - } - - - rc = ep->ephw->map_single(ep, rd_salami, - bytebufsize, - DMA_TO_DEVICE, - &dma_addr); - - if (rc) - goto dmafail; - - iowrite32( - (u32) (dma_addr & 0xffffffff), - &ep->registers[ - fpga_dma_bufaddr_lowaddr_reg] - ); - iowrite32( - ((u32) ((((u64) dma_addr) >> 32) - & 0xffffffff)), - &ep->registers[ - fpga_dma_bufaddr_highaddr_reg] - ); - mmiowb(); - - this_buffer->addr = rd_salami; - this_buffer->dma_addr = dma_addr; - channel->rd_buffers[i] = this_buffer++; - - iowrite32(rd_nbuffer++, - &ep->registers[fpga_dma_bufno_reg]); - - left_of_rd_salami -= bytebufsize; - rd_salami += bytebufsize; - } + if (rc) + goto memfail; } if (!msg_buf_done) { @@ -640,16 +575,12 @@ static int xilly_setupchannels(struct xilly_endpoint *ep, "Corrupt IDT: No message buffer. Aborting.\n"); return -ENODEV; } - return 0; memfail: dev_err(ep->dev, - "Failed to allocate write buffer memory. Aborting.\n"); + "Failed to assign DMA buffer memory. Aborting.\n"); return -ENOMEM; -dmafail: - dev_err(ep->dev, "Failed to map DMA memory!. Aborting.\n"); - return rc; } static void xilly_scan_idt(struct xilly_endpoint *endpoint, -- 2.34.1