Hi there FreeBSD guys,
I am having some memory allocation woes in my FreeBSD kernel
device driver. I allocate DMAable memory with something like:
retval = bus_dma_tag_create
(
NULL,
4,
0,
BUS_SPACE_MAXADDR,
BUS_SPACE_MAXADDR,
NULL,
NULL,
(1 << 20),
1,
(1 << 20),
0,
&memtag
);
retval = bus_dmamem_alloc
(
memtag,
(void **) &vaddr,
BUS_DMA_WAITOK,
&memmap
);
retval = bus_dmamap_load
(
memtag,
memmap,
vaddr,
(1 << 20),
my_callback,
NULL,
0
);
which seems to succeed/work. But when I attempt to release the
allocated memory like this:
bus_dmamap_unload(memtag, memmap);
bus_dmamem_free(memtag, (void *) vaddr, memmap);
bus_dmamap_destroy(memtag, memmap);
bus_dma_tag_destroy(memtag);
The actual memory does not seem to get released. If I continually
load and unload the driver, the physical addresses allocated
keep increasing by the amount I am trying to allocate and never
seem to get re-used. In addition, after enough load/unloads
'bus_dmamem_alloc' returns ENOMEM!
So to mem it does not look like the deallocation incantation
is actually releasing the allocated memory back to the system.
Any ideas would be appreciated.
Further information:
Machine:
P4 1.4 GHz
512MB memory
OS:
FreeBSD 4.5
Thank you.
Greg.
--
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| HW/SW Engineer [EMAIL PROTECTED] |
| Canon Information Systems Research Australia (CISRA) |
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| "I FLEXed my BISON and it went YACC!" - me. |
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