Commit a5003fc04113 ("[ALSA] emu10k1 - simplify page allocation for synth") switched from using the DMA allocator for synth DMA pages to manually calling alloc_page(). However, this usage has an implicit assumption that the DMA address space for the emu10k1-family chip is the same as the CPU physical address space which is not true for a system with a IOMMU.

Since this made the synth part of the driver non-functional on such systems let's effectively revert that commit.

Signed-off-by: Maciej S. Szmigiero mail@maciej.szmigiero.name --- sound/pci/emu10k1/memory.c | 70 ++++++++++++++++++++++++++-------------------- 1 file changed, 39 insertions(+), 31 deletions(-)

diff --git a/sound/pci/emu10k1/memory.c b/sound/pci/emu10k1/memory.c index 39afe199e1c7..a23eba540132 100644 --- a/sound/pci/emu10k1/memory.c +++ b/sound/pci/emu10k1/memory.c @@ -457,49 +457,44 @@ static void get_single_page_range(struct snd_util_memhdr *hdr, *last_page_ret = last_page; }

-/* release allocated pages */ -static void __synth_free_pages(struct snd_emu10k1 *emu, int first_page, - int last_page) -{ - int page; - - for (page = first_page; page <= last_page; page++) { - free_page((unsigned long)emu->page_ptr_table[page]); - emu->page_addr_table[page] = 0; - emu->page_ptr_table[page] = NULL; - } -} - /* * allocate kernel pages */ static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) { int page, first_page, last_page; + struct snd_dma_buffer dmab;

emu10k1_memblk_init(blk); get_single_page_range(emu->memhdr, blk, &first_page, &last_page); /* allocate kernel pages */ for (page = first_page; page <= last_page; page++) { - /* first try to allocate from <4GB zone */ - struct page *p = alloc_page(GFP_KERNEL | GFP_DMA32 | - __GFP_NOWARN); - if (!p || (page_to_pfn(p) & ~(emu->dma_mask >> PAGE_SHIFT))) { - if (p) - __free_page(p); - /* try to allocate from <16MB zone */ - p = alloc_page(GFP_ATOMIC | GFP_DMA | - __GFP_NORETRY | /* no OOM-killer */ - __GFP_NOWARN); - } - if (!p) { - __synth_free_pages(emu, first_page, page - 1); - return -ENOMEM; + if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, + snd_dma_pci_data(emu->pci), + PAGE_SIZE, &dmab) < 0) + goto __fail; + if (!is_valid_page(emu, dmab.addr)) { + snd_dma_free_pages(&dmab); + goto __fail; } - emu->page_addr_table[page] = page_to_phys(p); - emu->page_ptr_table[page] = page_address(p); + emu->page_addr_table[page] = dmab.addr; + emu->page_ptr_table[page] = dmab.area; } return 0; + +__fail: + /* release allocated pages */ + last_page = page - 1; + for (page = first_page; page <= last_page; page++) { + dmab.area = emu->page_ptr_table[page]; + dmab.addr = emu->page_addr_table[page]; + dmab.bytes = PAGE_SIZE; + snd_dma_free_pages(&dmab); + emu->page_addr_table[page] = 0; + emu->page_ptr_table[page] = NULL; + } + + return -ENOMEM; }

/* @@ -507,10 +502,23 @@ static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk */ static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) { - int first_page, last_page; + int page, first_page, last_page; + struct snd_dma_buffer dmab;

get_single_page_range(emu->memhdr, blk, &first_page, &last_page); - __synth_free_pages(emu, first_page, last_page); + dmab.dev.type = SNDRV_DMA_TYPE_DEV; + dmab.dev.dev = snd_dma_pci_data(emu->pci); + for (page = first_page; page <= last_page; page++) { + if (emu->page_ptr_table[page] == NULL) + continue; + dmab.area = emu->page_ptr_table[page]; + dmab.addr = emu->page_addr_table[page]; + dmab.bytes = PAGE_SIZE; + snd_dma_free_pages(&dmab); + emu->page_addr_table[page] = 0; + emu->page_ptr_table[page] = NULL; + } + return 0; }