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Subject[09/93] ALSA: ctxfi - fix PTP address initialization
2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Jaroslav Kysela <perex@perex.cz>

commit 21956b61f594f7924d98240da74bc81c28601fa9 upstream.

After hours of debugging, I finally found the reason why some source
and runtime combination does not work. The PTP (page table pages)
address must be aligned. I am not sure how much, but alignment to
PAGE_SIZE is sufficient. Also, use ALSA's page allocation routines
to ensure proper virtual -> physical address translation.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
sound/pci/ctxfi/ctatc.c | 15 ++-------------
sound/pci/ctxfi/ctvmem.c | 38 ++++++++++++++++++--------------------
sound/pci/ctxfi/ctvmem.h | 8 +++++---
3 files changed, 25 insertions(+), 36 deletions(-)
--- a/sound/pci/ctxfi/ctatc.c
+++ b/sound/pci/ctxfi/ctatc.c
@@ -166,18 +166,7 @@ static void ct_unmap_audio_buffer(struct

static unsigned long atc_get_ptp_phys(struct ct_atc *atc, int index)
{
- struct ct_vm *vm;
- void *kvirt_addr;
- unsigned long phys_addr;
-
- vm = atc->vm;
- kvirt_addr = vm->get_ptp_virt(vm, index);
- if (kvirt_addr == NULL)
- phys_addr = (~0UL);
- else
- phys_addr = virt_to_phys(kvirt_addr);
-
- return phys_addr;
+ return atc->vm->get_ptp_phys(atc->vm, index);
}

static unsigned int convert_format(snd_pcm_format_t snd_format)
@@ -1669,7 +1658,7 @@ int __devinit ct_atc_create(struct snd_c
}

/* Set up device virtual memory management object */
- err = ct_vm_create(&atc->vm);
+ err = ct_vm_create(&atc->vm, pci);
if (err < 0)
goto error1;

--- a/sound/pci/ctxfi/ctvmem.c
+++ b/sound/pci/ctxfi/ctvmem.c
@@ -138,7 +138,7 @@ ct_vm_map(struct ct_vm *vm, struct snd_p
return NULL;
}

- ptp = vm->ptp[0];
+ ptp = (unsigned long *)vm->ptp[0].area;
pte_start = (block->addr >> CT_PAGE_SHIFT);
pages = block->size >> CT_PAGE_SHIFT;
for (i = 0; i < pages; i++) {
@@ -158,25 +158,25 @@ static void ct_vm_unmap(struct ct_vm *vm
}

/* *
- * return the host (kmalloced) addr of the @index-th device
- * page talbe page on success, or NULL on failure.
- * The first returned NULL indicates the termination.
+ * return the host physical addr of the @index-th device
+ * page table page on success, or ~0UL on failure.
+ * The first returned ~0UL indicates the termination.
* */
-static void *
-ct_get_ptp_virt(struct ct_vm *vm, int index)
+static dma_addr_t
+ct_get_ptp_phys(struct ct_vm *vm, int index)
{
- void *addr;
+ dma_addr_t addr;

- addr = (index >= CT_PTP_NUM) ? NULL : vm->ptp[index];
+ addr = (index >= CT_PTP_NUM) ? ~0UL : vm->ptp[index].addr;

return addr;
}

-int ct_vm_create(struct ct_vm **rvm)
+int ct_vm_create(struct ct_vm **rvm, struct pci_dev *pci)
{
struct ct_vm *vm;
struct ct_vm_block *block;
- int i;
+ int i, err = 0;

*rvm = NULL;

@@ -188,23 +188,21 @@ int ct_vm_create(struct ct_vm **rvm)

/* Allocate page table pages */
for (i = 0; i < CT_PTP_NUM; i++) {
- vm->ptp[i] = kmalloc(PAGE_SIZE, GFP_KERNEL);
- if (!vm->ptp[i])
+ err = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV,
+ snd_dma_pci_data(pci),
+ PAGE_SIZE, &vm->ptp[i]);
+ if (err < 0)
break;
}
- if (!i) {
+ if (err < 0) {
/* no page table pages are allocated */
- kfree(vm);
+ ct_vm_destroy(vm);
return -ENOMEM;
}
vm->size = CT_ADDRS_PER_PAGE * i;
- /* Initialise remaining ptps */
- for (; i < CT_PTP_NUM; i++)
- vm->ptp[i] = NULL;
-
vm->map = ct_vm_map;
vm->unmap = ct_vm_unmap;
- vm->get_ptp_virt = ct_get_ptp_virt;
+ vm->get_ptp_phys = ct_get_ptp_phys;
INIT_LIST_HEAD(&vm->unused);
INIT_LIST_HEAD(&vm->used);
block = kzalloc(sizeof(*block), GFP_KERNEL);
@@ -242,7 +240,7 @@ void ct_vm_destroy(struct ct_vm *vm)

/* free allocated page table pages */
for (i = 0; i < CT_PTP_NUM; i++)
- kfree(vm->ptp[i]);
+ snd_dma_free_pages(&vm->ptp[i]);

vm->size = 0;

--- a/sound/pci/ctxfi/ctvmem.h
+++ b/sound/pci/ctxfi/ctvmem.h
@@ -22,6 +22,8 @@

#include <linux/mutex.h>
#include <linux/list.h>
+#include <linux/pci.h>
+#include <sound/memalloc.h>

/* The chip can handle the page table of 4k pages
* (emu20k1 can handle even 8k pages, but we don't use it right now)
@@ -41,7 +43,7 @@ struct snd_pcm_substream;

/* Virtual memory management object for card device */
struct ct_vm {
- void *ptp[CT_PTP_NUM]; /* Device page table pages */
+ struct snd_dma_buffer ptp[CT_PTP_NUM]; /* Device page table pages */
unsigned int size; /* Available addr space in bytes */
struct list_head unused; /* List of unused blocks */
struct list_head used; /* List of used blocks */
@@ -52,10 +54,10 @@ struct ct_vm {
int size);
/* Unmap device logical addr area. */
void (*unmap)(struct ct_vm *, struct ct_vm_block *block);
- void *(*get_ptp_virt)(struct ct_vm *vm, int index);
+ dma_addr_t (*get_ptp_phys)(struct ct_vm *vm, int index);
};

-int ct_vm_create(struct ct_vm **rvm);
+int ct_vm_create(struct ct_vm **rvm, struct pci_dev *pci);
void ct_vm_destroy(struct ct_vm *vm);

#endif /* CTVMEM_H */



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