From 41d5e59c1299f27983977bcfe3b360600996051c Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 6 Jan 2009 11:38:21 -0700 Subject: dmaengine: add a release for dma class devices and dependent infrastructure Resolves: WARNING: at drivers/base/core.c:122 device_release+0x4d/0x52() Device 'dma0chan0' does not have a release() function, it is broken and must be fixed. The dma_chan_dev object is introduced to gear-match sysfs kobject and dmaengine channel lifetimes. When a channel is removed access to the sysfs entries return -ENODEV until the kobject can be released. The bulk of the change is updates to existing code to handle the extra layer of indirection between a dma_chan and its struct device. Reported-by: Alexander Beregalov Acked-by: Stephen Hemminger Cc: Haavard Skinnemoen Signed-off-by: Dan Williams --- drivers/dma/dw_dmac.c | 91 ++++++++++++++++++++++++++++----------------------- 1 file changed, 50 insertions(+), 41 deletions(-) (limited to 'drivers/dma/dw_dmac.c') diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c index a29dda8f801..6b702cc46b3 100644 --- a/drivers/dma/dw_dmac.c +++ b/drivers/dma/dw_dmac.c @@ -70,6 +70,15 @@ * the controller, though. */ +static struct device *chan2dev(struct dma_chan *chan) +{ + return &chan->dev->device; +} +static struct device *chan2parent(struct dma_chan *chan) +{ + return chan->dev->device.parent; +} + static struct dw_desc *dwc_first_active(struct dw_dma_chan *dwc) { return list_entry(dwc->active_list.next, struct dw_desc, desc_node); @@ -93,12 +102,12 @@ static struct dw_desc *dwc_desc_get(struct dw_dma_chan *dwc) ret = desc; break; } - dev_dbg(&dwc->chan.dev, "desc %p not ACKed\n", desc); + dev_dbg(chan2dev(&dwc->chan), "desc %p not ACKed\n", desc); i++; } spin_unlock_bh(&dwc->lock); - dev_vdbg(&dwc->chan.dev, "scanned %u descriptors on freelist\n", i); + dev_vdbg(chan2dev(&dwc->chan), "scanned %u descriptors on freelist\n", i); return ret; } @@ -108,10 +117,10 @@ static void dwc_sync_desc_for_cpu(struct dw_dma_chan *dwc, struct dw_desc *desc) struct dw_desc *child; list_for_each_entry(child, &desc->txd.tx_list, desc_node) - dma_sync_single_for_cpu(dwc->chan.dev.parent, + dma_sync_single_for_cpu(chan2parent(&dwc->chan), child->txd.phys, sizeof(child->lli), DMA_TO_DEVICE); - dma_sync_single_for_cpu(dwc->chan.dev.parent, + dma_sync_single_for_cpu(chan2parent(&dwc->chan), desc->txd.phys, sizeof(desc->lli), DMA_TO_DEVICE); } @@ -129,11 +138,11 @@ static void dwc_desc_put(struct dw_dma_chan *dwc, struct dw_desc *desc) spin_lock_bh(&dwc->lock); list_for_each_entry(child, &desc->txd.tx_list, desc_node) - dev_vdbg(&dwc->chan.dev, + dev_vdbg(chan2dev(&dwc->chan), "moving child desc %p to freelist\n", child); list_splice_init(&desc->txd.tx_list, &dwc->free_list); - dev_vdbg(&dwc->chan.dev, "moving desc %p to freelist\n", desc); + dev_vdbg(chan2dev(&dwc->chan), "moving desc %p to freelist\n", desc); list_add(&desc->desc_node, &dwc->free_list); spin_unlock_bh(&dwc->lock); } @@ -163,9 +172,9 @@ static void dwc_dostart(struct dw_dma_chan *dwc, struct dw_desc *first) /* ASSERT: channel is idle */ if (dma_readl(dw, CH_EN) & dwc->mask) { - dev_err(&dwc->chan.dev, + dev_err(chan2dev(&dwc->chan), "BUG: Attempted to start non-idle channel\n"); - dev_err(&dwc->chan.dev, + dev_err(chan2dev(&dwc->chan), " SAR: 0x%x DAR: 0x%x LLP: 0x%x CTL: 0x%x:%08x\n", channel_readl(dwc, SAR), channel_readl(dwc, DAR), @@ -193,7 +202,7 @@ dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc) void *param; struct dma_async_tx_descriptor *txd = &desc->txd; - dev_vdbg(&dwc->chan.dev, "descriptor %u complete\n", txd->cookie); + dev_vdbg(chan2dev(&dwc->chan), "descriptor %u complete\n", txd->cookie); dwc->completed = txd->cookie; callback = txd->callback; @@ -208,11 +217,11 @@ dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc) * mapped before they were submitted... */ if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP)) - dma_unmap_page(dwc->chan.dev.parent, desc->lli.dar, desc->len, - DMA_FROM_DEVICE); + dma_unmap_page(chan2parent(&dwc->chan), desc->lli.dar, + desc->len, DMA_FROM_DEVICE); if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP)) - dma_unmap_page(dwc->chan.dev.parent, desc->lli.sar, desc->len, - DMA_TO_DEVICE); + dma_unmap_page(chan2parent(&dwc->chan), desc->lli.sar, + desc->len, DMA_TO_DEVICE); /* * The API requires that no submissions are done from a @@ -228,7 +237,7 @@ static void dwc_complete_all(struct dw_dma *dw, struct dw_dma_chan *dwc) LIST_HEAD(list); if (dma_readl(dw, CH_EN) & dwc->mask) { - dev_err(&dwc->chan.dev, + dev_err(chan2dev(&dwc->chan), "BUG: XFER bit set, but channel not idle!\n"); /* Try to continue after resetting the channel... */ @@ -273,7 +282,7 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc) return; } - dev_vdbg(&dwc->chan.dev, "scan_descriptors: llp=0x%x\n", llp); + dev_vdbg(chan2dev(&dwc->chan), "scan_descriptors: llp=0x%x\n", llp); list_for_each_entry_safe(desc, _desc, &dwc->active_list, desc_node) { if (desc->lli.llp == llp) @@ -292,7 +301,7 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc) dwc_descriptor_complete(dwc, desc); } - dev_err(&dwc->chan.dev, + dev_err(chan2dev(&dwc->chan), "BUG: All descriptors done, but channel not idle!\n"); /* Try to continue after resetting the channel... */ @@ -308,7 +317,7 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc) static void dwc_dump_lli(struct dw_dma_chan *dwc, struct dw_lli *lli) { - dev_printk(KERN_CRIT, &dwc->chan.dev, + dev_printk(KERN_CRIT, chan2dev(&dwc->chan), " desc: s0x%x d0x%x l0x%x c0x%x:%x\n", lli->sar, lli->dar, lli->llp, lli->ctlhi, lli->ctllo); @@ -342,9 +351,9 @@ static void dwc_handle_error(struct dw_dma *dw, struct dw_dma_chan *dwc) * controller flagged an error instead of scribbling over * random memory locations. */ - dev_printk(KERN_CRIT, &dwc->chan.dev, + dev_printk(KERN_CRIT, chan2dev(&dwc->chan), "Bad descriptor submitted for DMA!\n"); - dev_printk(KERN_CRIT, &dwc->chan.dev, + dev_printk(KERN_CRIT, chan2dev(&dwc->chan), " cookie: %d\n", bad_desc->txd.cookie); dwc_dump_lli(dwc, &bad_desc->lli); list_for_each_entry(child, &bad_desc->txd.tx_list, desc_node) @@ -442,12 +451,12 @@ static dma_cookie_t dwc_tx_submit(struct dma_async_tx_descriptor *tx) * for DMA. But this is hard to do in a race-free manner. */ if (list_empty(&dwc->active_list)) { - dev_vdbg(&tx->chan->dev, "tx_submit: started %u\n", + dev_vdbg(chan2dev(tx->chan), "tx_submit: started %u\n", desc->txd.cookie); dwc_dostart(dwc, desc); list_add_tail(&desc->desc_node, &dwc->active_list); } else { - dev_vdbg(&tx->chan->dev, "tx_submit: queued %u\n", + dev_vdbg(chan2dev(tx->chan), "tx_submit: queued %u\n", desc->txd.cookie); list_add_tail(&desc->desc_node, &dwc->queue); @@ -472,11 +481,11 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, unsigned int dst_width; u32 ctllo; - dev_vdbg(&chan->dev, "prep_dma_memcpy d0x%x s0x%x l0x%zx f0x%lx\n", + dev_vdbg(chan2dev(chan), "prep_dma_memcpy d0x%x s0x%x l0x%zx f0x%lx\n", dest, src, len, flags); if (unlikely(!len)) { - dev_dbg(&chan->dev, "prep_dma_memcpy: length is zero!\n"); + dev_dbg(chan2dev(chan), "prep_dma_memcpy: length is zero!\n"); return NULL; } @@ -516,7 +525,7 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, first = desc; } else { prev->lli.llp = desc->txd.phys; - dma_sync_single_for_device(chan->dev.parent, + dma_sync_single_for_device(chan2parent(chan), prev->txd.phys, sizeof(prev->lli), DMA_TO_DEVICE); list_add_tail(&desc->desc_node, @@ -531,7 +540,7 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, prev->lli.ctllo |= DWC_CTLL_INT_EN; prev->lli.llp = 0; - dma_sync_single_for_device(chan->dev.parent, + dma_sync_single_for_device(chan2parent(chan), prev->txd.phys, sizeof(prev->lli), DMA_TO_DEVICE); @@ -562,7 +571,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, struct scatterlist *sg; size_t total_len = 0; - dev_vdbg(&chan->dev, "prep_dma_slave\n"); + dev_vdbg(chan2dev(chan), "prep_dma_slave\n"); if (unlikely(!dws || !sg_len)) return NULL; @@ -570,7 +579,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, reg_width = dws->reg_width; prev = first = NULL; - sg_len = dma_map_sg(chan->dev.parent, sgl, sg_len, direction); + sg_len = dma_map_sg(chan2parent(chan), sgl, sg_len, direction); switch (direction) { case DMA_TO_DEVICE: @@ -587,7 +596,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, desc = dwc_desc_get(dwc); if (!desc) { - dev_err(&chan->dev, + dev_err(chan2dev(chan), "not enough descriptors available\n"); goto err_desc_get; } @@ -607,7 +616,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, first = desc; } else { prev->lli.llp = desc->txd.phys; - dma_sync_single_for_device(chan->dev.parent, + dma_sync_single_for_device(chan2parent(chan), prev->txd.phys, sizeof(prev->lli), DMA_TO_DEVICE); @@ -633,7 +642,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, desc = dwc_desc_get(dwc); if (!desc) { - dev_err(&chan->dev, + dev_err(chan2dev(chan), "not enough descriptors available\n"); goto err_desc_get; } @@ -653,7 +662,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, first = desc; } else { prev->lli.llp = desc->txd.phys; - dma_sync_single_for_device(chan->dev.parent, + dma_sync_single_for_device(chan2parent(chan), prev->txd.phys, sizeof(prev->lli), DMA_TO_DEVICE); @@ -673,7 +682,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, prev->lli.ctllo |= DWC_CTLL_INT_EN; prev->lli.llp = 0; - dma_sync_single_for_device(chan->dev.parent, + dma_sync_single_for_device(chan2parent(chan), prev->txd.phys, sizeof(prev->lli), DMA_TO_DEVICE); @@ -768,11 +777,11 @@ static int dwc_alloc_chan_resources(struct dma_chan *chan) u32 cfghi; u32 cfglo; - dev_vdbg(&chan->dev, "alloc_chan_resources\n"); + dev_vdbg(chan2dev(chan), "alloc_chan_resources\n"); /* ASSERT: channel is idle */ if (dma_readl(dw, CH_EN) & dwc->mask) { - dev_dbg(&chan->dev, "DMA channel not idle?\n"); + dev_dbg(chan2dev(chan), "DMA channel not idle?\n"); return -EIO; } @@ -808,7 +817,7 @@ static int dwc_alloc_chan_resources(struct dma_chan *chan) desc = kzalloc(sizeof(struct dw_desc), GFP_KERNEL); if (!desc) { - dev_info(&chan->dev, + dev_info(chan2dev(chan), "only allocated %d descriptors\n", i); spin_lock_bh(&dwc->lock); break; @@ -818,7 +827,7 @@ static int dwc_alloc_chan_resources(struct dma_chan *chan) desc->txd.tx_submit = dwc_tx_submit; desc->txd.flags = DMA_CTRL_ACK; INIT_LIST_HEAD(&desc->txd.tx_list); - desc->txd.phys = dma_map_single(chan->dev.parent, &desc->lli, + desc->txd.phys = dma_map_single(chan2parent(chan), &desc->lli, sizeof(desc->lli), DMA_TO_DEVICE); dwc_desc_put(dwc, desc); @@ -833,7 +842,7 @@ static int dwc_alloc_chan_resources(struct dma_chan *chan) spin_unlock_bh(&dwc->lock); - dev_dbg(&chan->dev, + dev_dbg(chan2dev(chan), "alloc_chan_resources allocated %d descriptors\n", i); return i; @@ -846,7 +855,7 @@ static void dwc_free_chan_resources(struct dma_chan *chan) struct dw_desc *desc, *_desc; LIST_HEAD(list); - dev_dbg(&chan->dev, "free_chan_resources (descs allocated=%u)\n", + dev_dbg(chan2dev(chan), "free_chan_resources (descs allocated=%u)\n", dwc->descs_allocated); /* ASSERT: channel is idle */ @@ -867,13 +876,13 @@ static void dwc_free_chan_resources(struct dma_chan *chan) spin_unlock_bh(&dwc->lock); list_for_each_entry_safe(desc, _desc, &list, desc_node) { - dev_vdbg(&chan->dev, " freeing descriptor %p\n", desc); - dma_unmap_single(chan->dev.parent, desc->txd.phys, + dev_vdbg(chan2dev(chan), " freeing descriptor %p\n", desc); + dma_unmap_single(chan2parent(chan), desc->txd.phys, sizeof(desc->lli), DMA_TO_DEVICE); kfree(desc); } - dev_vdbg(&chan->dev, "free_chan_resources done\n"); + dev_vdbg(chan2dev(chan), "free_chan_resources done\n"); } /*----------------------------------------------------------------------*/ -- cgit v1.2.3