[ALSA] emu10k1 - simplify page allocation for synth

Simplify the page allocation of emu10k1 driver for emux synth support.
Since these pages aren't be necessarily coherent, we can avoid
expensive DMA-coherent routines.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/emu10k1/memory.c b/sound/pci/emu10k1/memory.c
index 916c1db..128eaca 100644 (file)
--- a/sound/pci/emu10k1/memory.c
+++ b/sound/pci/emu10k1/memory.c
@@ -437,43 +437,46 @@ 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++) {
-               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;
+               /* 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)))
+                       /* try to allocate from <16MB zone */
+                       p = alloc_page(GFP_DMA |
+                                      __GFP_NORETRY | /* no OOM-killer */
+                                      __GFP_NOWARN);
+               if (!p) {
+                       __synth_free_pages(emu, first_page, page - 1);
+                       return -ENOMEM;
                }
-               emu->page_addr_table[page] = dmab.addr;
-               emu->page_ptr_table[page] = dmab.area;
+               emu->page_addr_table[page] = page_to_phys(p);
+               emu->page_ptr_table[page] = page_address(p);
        }
        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;
 }
 
 /*
@@ -481,23 +484,10 @@ __fail:
  */
 static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
 {
-       int page, first_page, last_page;
-       struct snd_dma_buffer dmab;
+       int first_page, last_page;
 
        get_single_page_range(emu->memhdr, blk, &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;
-       }
-
+       __synth_free_pages(emu, first_page, last_page);
        return 0;
 }