1 files changed, 564 insertions, 0 deletions

diff --git a/sound/pci/emu10k1/memory.c b/sound/pci/emu10k1/memory.c
new file mode 100644
index 000000000000..7a595f0dd7a1
--- /dev/null
+++ b/sound/pci/emu10k1/memory.c
@@ -0,0 +1,564 @@
+/*
+ *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
+ *  Copyright (c) by Takashi Iwai <tiwai@suse.de>
+ *
+ *  EMU10K1 memory page allocation (PTB area)
+ *
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ */
+
+#include <sound/driver.h>
+#include <linux/pci.h>
+#include <linux/time.h>
+#include <sound/core.h>
+#include <sound/emu10k1.h>
+
+/* page arguments of these two macros are Emu page (4096 bytes), not like
+ * aligned pages in others
+ */
+#define __set_ptb_entry(emu,page,addr) \
+        (((u32 *)(emu)->ptb_pages.area)[page] = cpu_to_le32(((addr) << 1) | (page)))
+
+#define UNIT_PAGES              (PAGE_SIZE / EMUPAGESIZE)
+#define MAX_ALIGN_PAGES         (MAXPAGES / UNIT_PAGES)
+/* get aligned page from offset address */
+#define get_aligned_page(offset)        ((offset) >> PAGE_SHIFT)
+/* get offset address from aligned page */
+#define aligned_page_offset(page)       ((page) << PAGE_SHIFT)
+
+#if PAGE_SIZE == 4096
+/* page size == EMUPAGESIZE */
+/* fill PTB entrie(s) corresponding to page with addr */
+#define set_ptb_entry(emu,page,addr)    __set_ptb_entry(emu,page,addr)
+/* fill PTB entrie(s) corresponding to page with silence pointer */
+#define set_silent_ptb(emu,page)        __set_ptb_entry(emu,page,emu->silent_page.addr)
+#else
+/* fill PTB entries -- we need to fill UNIT_PAGES entries */
+static inline void set_ptb_entry(emu10k1_t *emu, int page, dma_addr_t addr)
+{
+        int i;
+        page *= UNIT_PAGES;
+        for (i = 0; i < UNIT_PAGES; i++, page++) {
+                __set_ptb_entry(emu, page, addr);
+                addr += EMUPAGESIZE;
+        }
+}
+static inline void set_silent_ptb(emu10k1_t *emu, int page)
+{
+        int i;
+        page *= UNIT_PAGES;
+        for (i = 0; i < UNIT_PAGES; i++, page++)
+                /* do not increment ptr */
+                __set_ptb_entry(emu, page, emu->silent_page.addr);
+}
+#endif /* PAGE_SIZE */
+
+
+/*
+ */
+static int synth_alloc_pages(emu10k1_t *hw, emu10k1_memblk_t *blk);
+static int synth_free_pages(emu10k1_t *hw, emu10k1_memblk_t *blk);
+
+#define get_emu10k1_memblk(l,member)    list_entry(l, emu10k1_memblk_t, member)
+
+
+/* initialize emu10k1 part */
+static void emu10k1_memblk_init(emu10k1_memblk_t *blk)
+{
+        blk->mapped_page = -1;
+        INIT_LIST_HEAD(&blk->mapped_link);
+        INIT_LIST_HEAD(&blk->mapped_order_link);
+        blk->map_locked = 0;
+
+        blk->first_page = get_aligned_page(blk->mem.offset);
+        blk->last_page = get_aligned_page(blk->mem.offset + blk->mem.size - 1);
+        blk->pages = blk->last_page - blk->first_page + 1;
+}
+
+/*
+ * search empty region on PTB with the given size
+ *
+ * if an empty region is found, return the page and store the next mapped block
+ * in nextp
+ * if not found, return a negative error code.
+ */
+static int search_empty_map_area(emu10k1_t *emu, int npages, struct list_head **nextp)
+{
+        int page = 0, found_page = -ENOMEM;
+        int max_size = npages;
+        int size;
+        struct list_head *candidate = &emu->mapped_link_head;
+        struct list_head *pos;
+
+        list_for_each (pos, &emu->mapped_link_head) {
+                emu10k1_memblk_t *blk = get_emu10k1_memblk(pos, mapped_link);
+                snd_assert(blk->mapped_page >= 0, continue);
+                size = blk->mapped_page - page;
+                if (size == npages) {
+                        *nextp = pos;
+                        return page;
+                }
+                else if (size > max_size) {
+                        /* we look for the maximum empty hole */
+                        max_size = size;
+                        candidate = pos;
+                        found_page = page;
+                }
+                page = blk->mapped_page + blk->pages;
+        }
+        size = MAX_ALIGN_PAGES - page;
+        if (size >= max_size) {
+                *nextp = pos;
+                return page;
+        }
+        *nextp = candidate;
+        return found_page;
+}
+
+/*
+ * map a memory block onto emu10k1's PTB
+ *
+ * call with memblk_lock held
+ */
+static int map_memblk(emu10k1_t *emu, emu10k1_memblk_t *blk)
+{
+        int page, pg;
+        struct list_head *next;
+
+        page = search_empty_map_area(emu, blk->pages, &next);
+        if (page < 0) /* not found */
+                return page;
+        /* insert this block in the proper position of mapped list */
+        list_add_tail(&blk->mapped_link, next);
+        /* append this as a newest block in order list */
+        list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head);
+        blk->mapped_page = page;
+        /* fill PTB */
+        for (pg = blk->first_page; pg <= blk->last_page; pg++) {
+                set_ptb_entry(emu, page, emu->page_addr_table[pg]);
+                page++;
+        }
+        return 0;
+}
+
+/*
+ * unmap the block
+ * return the size of resultant empty pages
+ *
+ * call with memblk_lock held
+ */
+static int unmap_memblk(emu10k1_t *emu, emu10k1_memblk_t *blk)
+{
+        int start_page, end_page, mpage, pg;
+        struct list_head *p;
+        emu10k1_memblk_t *q;
+
+        /* calculate the expected size of empty region */
+        if ((p = blk->mapped_link.prev) != &emu->mapped_link_head) {
+                q = get_emu10k1_memblk(p, mapped_link);
+                start_page = q->mapped_page + q->pages;
+        } else
+                start_page = 0;
+        if ((p = blk->mapped_link.next) != &emu->mapped_link_head) {
+                q = get_emu10k1_memblk(p, mapped_link);
+                end_page = q->mapped_page;
+        } else
+                end_page = MAX_ALIGN_PAGES;
+
+        /* remove links */
+        list_del(&blk->mapped_link);
+        list_del(&blk->mapped_order_link);
+        /* clear PTB */
+        mpage = blk->mapped_page;
+        for (pg = blk->first_page; pg <= blk->last_page; pg++) {
+                set_silent_ptb(emu, mpage);
+                mpage++;
+        }
+        blk->mapped_page = -1;
+        return end_page - start_page; /* return the new empty size */
+}
+
+/*
+ * search empty pages with the given size, and create a memory block
+ *
+ * unlike synth_alloc the memory block is aligned to the page start
+ */
+static emu10k1_memblk_t *
+search_empty(emu10k1_t *emu, int size)
+{
+        struct list_head *p;
+        emu10k1_memblk_t *blk;
+        int page, psize;
+
+        psize = get_aligned_page(size + PAGE_SIZE -1);
+        page = 0;
+        list_for_each(p, &emu->memhdr->block) {
+                blk = get_emu10k1_memblk(p, mem.list);
+                if (page + psize <= blk->first_page)
+                        goto __found_pages;
+                page = blk->last_page + 1;
+        }
+        if (page + psize > emu->max_cache_pages)
+                return NULL;
+
+__found_pages:
+        /* create a new memory block */
+        blk = (emu10k1_memblk_t *)__snd_util_memblk_new(emu->memhdr, psize << PAGE_SHIFT, p->prev);
+        if (blk == NULL)
+                return NULL;
+        blk->mem.offset = aligned_page_offset(page); /* set aligned offset */
+        emu10k1_memblk_init(blk);
+        return blk;
+}
+
+
+/*
+ * check if the given pointer is valid for pages
+ */
+static int is_valid_page(emu10k1_t *emu, dma_addr_t addr)
+{
+        if (addr & ~emu->dma_mask) {
+                snd_printk("max memory size is 0x%lx (addr = 0x%lx)!!\n", emu->dma_mask, (unsigned long)addr);
+                return 0;
+        }
+        if (addr & (EMUPAGESIZE-1)) {
+                snd_printk("page is not aligned\n");
+                return 0;
+        }
+        return 1;
+}
+
+/*
+ * map the given memory block on PTB.
+ * if the block is already mapped, update the link order.
+ * if no empty pages are found, tries to release unsed memory blocks
+ * and retry the mapping.
+ */
+int snd_emu10k1_memblk_map(emu10k1_t *emu, emu10k1_memblk_t *blk)
+{
+        int err;
+        int size;
+        struct list_head *p, *nextp;
+        emu10k1_memblk_t *deleted;
+        unsigned long flags;
+
+        spin_lock_irqsave(&emu->memblk_lock, flags);
+        if (blk->mapped_page >= 0) {
+                /* update order link */
+                list_del(&blk->mapped_order_link);
+                list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head);
+                spin_unlock_irqrestore(&emu->memblk_lock, flags);
+                return 0;
+        }
+        if ((err = map_memblk(emu, blk)) < 0) {
+                /* no enough page - try to unmap some blocks */
+                /* starting from the oldest block */
+                p = emu->mapped_order_link_head.next;
+                for (; p != &emu->mapped_order_link_head; p = nextp) {
+                        nextp = p->next;
+                        deleted = get_emu10k1_memblk(p, mapped_order_link);
+                        if (deleted->map_locked)
+                                continue;
+                        size = unmap_memblk(emu, deleted);
+                        if (size >= blk->pages) {
+                                /* ok the empty region is enough large */
+                                err = map_memblk(emu, blk);
+                                break;
+                        }
+                }
+        }
+        spin_unlock_irqrestore(&emu->memblk_lock, flags);
+        return err;
+}
+
+/*
+ * page allocation for DMA
+ */
+snd_util_memblk_t *
+snd_emu10k1_alloc_pages(emu10k1_t *emu, snd_pcm_substream_t *substream)
+{
+        snd_pcm_runtime_t *runtime = substream->runtime;
+        struct snd_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream);
+        snd_util_memhdr_t *hdr;
+        emu10k1_memblk_t *blk;
+        int page, err, idx;
+
+        snd_assert(emu, return NULL);
+        snd_assert(runtime->dma_bytes > 0 && runtime->dma_bytes < MAXPAGES * EMUPAGESIZE, return NULL);
+        hdr = emu->memhdr;
+        snd_assert(hdr, return NULL);
+
+        down(&hdr->block_mutex);
+        blk = search_empty(emu, runtime->dma_bytes);
+        if (blk == NULL) {
+                up(&hdr->block_mutex);
+                return NULL;
+        }
+        /* fill buffer addresses but pointers are not stored so that
+         * snd_free_pci_page() is not called in in synth_free()
+         */
+        idx = 0;
+        for (page = blk->first_page; page <= blk->last_page; page++, idx++) {
+                dma_addr_t addr;
+#ifdef CONFIG_SND_DEBUG
+                if (idx >= sgbuf->pages) {
+                        printk(KERN_ERR "emu: pages overflow! (%d-%d) for %d\n",
+                               blk->first_page, blk->last_page, sgbuf->pages);
+                        up(&hdr->block_mutex);
+                        return NULL;
+                }
+#endif
+                addr = sgbuf->table[idx].addr;
+                if (! is_valid_page(emu, addr)) {
+                        printk(KERN_ERR "emu: failure page = %d\n", idx);
+                        up(&hdr->block_mutex);
+                        return NULL;
+                }
+                emu->page_addr_table[page] = addr;
+                emu->page_ptr_table[page] = NULL;
+        }
+
+        /* set PTB entries */
+        blk->map_locked = 1; /* do not unmap this block! */
+        err = snd_emu10k1_memblk_map(emu, blk);
+        if (err < 0) {
+                __snd_util_mem_free(hdr, (snd_util_memblk_t *)blk);
+                up(&hdr->block_mutex);
+                return NULL;
+        }
+        up(&hdr->block_mutex);
+        return (snd_util_memblk_t *)blk;
+}
+
+
+/*
+ * release DMA buffer from page table
+ */
+int snd_emu10k1_free_pages(emu10k1_t *emu, snd_util_memblk_t *blk)
+{
+        snd_assert(emu && blk, return -EINVAL);
+        return snd_emu10k1_synth_free(emu, blk);
+}
+
+
+/*
+ * memory allocation using multiple pages (for synth)
+ * Unlike the DMA allocation above, non-contiguous pages are assined.
+ */
+
+/*
+ * allocate a synth sample area
+ */
+snd_util_memblk_t *
+snd_emu10k1_synth_alloc(emu10k1_t *hw, unsigned int size)
+{
+        emu10k1_memblk_t *blk;
+        snd_util_memhdr_t *hdr = hw->memhdr; 
+
+        down(&hdr->block_mutex);
+        blk = (emu10k1_memblk_t *)__snd_util_mem_alloc(hdr, size);
+        if (blk == NULL) {
+                up(&hdr->block_mutex);
+                return NULL;
+        }
+        if (synth_alloc_pages(hw, blk)) {
+                __snd_util_mem_free(hdr, (snd_util_memblk_t *)blk);
+                up(&hdr->block_mutex);
+                return NULL;
+        }
+        snd_emu10k1_memblk_map(hw, blk);
+        up(&hdr->block_mutex);
+        return (snd_util_memblk_t *)blk;
+}
+
+
+/*
+ * free a synth sample area
+ */
+int
+snd_emu10k1_synth_free(emu10k1_t *emu, snd_util_memblk_t *memblk)
+{
+        snd_util_memhdr_t *hdr = emu->memhdr; 
+        emu10k1_memblk_t *blk = (emu10k1_memblk_t *)memblk;
+        unsigned long flags;
+
+        down(&hdr->block_mutex);
+        spin_lock_irqsave(&emu->memblk_lock, flags);
+        if (blk->mapped_page >= 0)
+                unmap_memblk(emu, blk);
+        spin_unlock_irqrestore(&emu->memblk_lock, flags);
+        synth_free_pages(emu, blk);
+         __snd_util_mem_free(hdr, memblk);
+        up(&hdr->block_mutex);
+        return 0;
+}
+
+
+/* check new allocation range */
+static void get_single_page_range(snd_util_memhdr_t *hdr, emu10k1_memblk_t *blk, int *first_page_ret, int *last_page_ret)
+{
+        struct list_head *p;
+        emu10k1_memblk_t *q;
+        int first_page, last_page;
+        first_page = blk->first_page;
+        if ((p = blk->mem.list.prev) != &hdr->block) {
+                q = get_emu10k1_memblk(p, mem.list);
+                if (q->last_page == first_page)
+                        first_page++;  /* first page was already allocated */
+        }
+        last_page = blk->last_page;
+        if ((p = blk->mem.list.next) != &hdr->block) {
+                q = get_emu10k1_memblk(p, mem.list);
+                if (q->first_page == last_page)
+                        last_page--; /* last page was already allocated */
+        }
+        *first_page_ret = first_page;
+        *last_page_ret = last_page;
+}
+
+/*
+ * allocate kernel pages
+ */
+static int synth_alloc_pages(emu10k1_t *emu, emu10k1_memblk_t *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;
+                }
+                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;
+}
+
+/*
+ * free pages
+ */
+static int synth_free_pages(emu10k1_t *emu, emu10k1_memblk_t *blk)
+{
+        int page, first_page, last_page;
+        struct snd_dma_buffer dmab;
+
+        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;
+        }
+
+        return 0;
+}
+
+/* calculate buffer pointer from offset address */
+inline static void *offset_ptr(emu10k1_t *emu, int page, int offset)
+{
+        char *ptr;
+        snd_assert(page >= 0 && page < emu->max_cache_pages, return NULL);
+        ptr = emu->page_ptr_table[page];
+        if (! ptr) {
+                printk("emu10k1: access to NULL ptr: page = %d\n", page);
+                return NULL;
+        }
+        ptr += offset & (PAGE_SIZE - 1);
+        return (void*)ptr;
+}
+
+/*
+ * bzero(blk + offset, size)
+ */
+int snd_emu10k1_synth_bzero(emu10k1_t *emu, snd_util_memblk_t *blk, int offset, int size)
+{
+        int page, nextofs, end_offset, temp, temp1;
+        void *ptr;
+        emu10k1_memblk_t *p = (emu10k1_memblk_t *)blk;
+
+        offset += blk->offset & (PAGE_SIZE - 1);
+        end_offset = offset + size;
+        page = get_aligned_page(offset);
+        do {
+                nextofs = aligned_page_offset(page + 1);
+                temp = nextofs - offset;
+                temp1 = end_offset - offset;
+                if (temp1 < temp)
+                        temp = temp1;
+                ptr = offset_ptr(emu, page + p->first_page, offset);
+                if (ptr)
+                        memset(ptr, 0, temp);
+                offset = nextofs;
+                page++;
+        } while (offset < end_offset);
+        return 0;
+}
+
+/*
+ * copy_from_user(blk + offset, data, size)
+ */
+int snd_emu10k1_synth_copy_from_user(emu10k1_t *emu, snd_util_memblk_t *blk, int offset, const char __user *data, int size)
+{
+        int page, nextofs, end_offset, temp, temp1;
+        void *ptr;
+        emu10k1_memblk_t *p = (emu10k1_memblk_t *)blk;
+
+        offset += blk->offset & (PAGE_SIZE - 1);
+        end_offset = offset + size;
+        page = get_aligned_page(offset);
+        do {
+                nextofs = aligned_page_offset(page + 1);
+                temp = nextofs - offset;
+                temp1 = end_offset - offset;
+                if (temp1 < temp)
+                        temp = temp1;
+                ptr = offset_ptr(emu, page + p->first_page, offset);
+                if (ptr && copy_from_user(ptr, data, temp))
+                        return -EFAULT;
+                offset = nextofs;
+                data += temp;
+                page++;
+        } while (offset < end_offset);
+        return 0;
+}