[PATCH 4/5] ALSA: emu10k1: make sure synth DMA pages are allocated with DMA functions

["Maciej S. Szmigiero" <mail@maciej.szmigiero.name>]

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;
 }