freebsd-dev/sys/dev/ath/if_ath_descdma.c
Adrian Chadd b45de1ebcd [ath] migrate ioctl and busdma memory operations out into separate source files.
This should be a big no-op pass; and reduces the size of if_ath.c.

I'm hopefully soon going to take a whack at the USB support for ath(4)
and this'll require some reuse of the busdma memory code.
2015-11-24 03:42:58 +00:00

443 lines
12 KiB
C

/*-
* Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
* redistribution must be conditioned upon including a substantially
* similar Disclaimer requirement for further binary redistribution.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGES.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* Driver for the Atheros Wireless LAN controller.
*
* This software is derived from work of Atsushi Onoe; his contribution
* is greatly appreciated.
*/
#include "opt_inet.h"
#include "opt_ath.h"
/*
* This is needed for register operations which are performed
* by the driver - eg, calls to ath_hal_gettsf32().
*
* It's also required for any AH_DEBUG checks in here, eg the
* module dependencies.
*/
#include "opt_ah.h"
#include "opt_wlan.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/errno.h>
#include <sys/callout.h>
#include <sys/bus.h>
#include <sys/endian.h>
#include <sys/kthread.h>
#include <sys/taskqueue.h>
#include <sys/priv.h>
#include <sys/module.h>
#include <sys/ktr.h>
#include <sys/smp.h> /* for mp_ncpus */
#include <machine/bus.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_types.h>
#include <net/if_arp.h>
#include <net/ethernet.h>
#include <net/if_llc.h>
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_regdomain.h>
#ifdef IEEE80211_SUPPORT_SUPERG
#include <net80211/ieee80211_superg.h>
#endif
#ifdef IEEE80211_SUPPORT_TDMA
#include <net80211/ieee80211_tdma.h>
#endif
#include <net/bpf.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/if_ether.h>
#endif
#include <dev/ath/if_athvar.h>
#include <dev/ath/ath_hal/ah_devid.h> /* XXX for softled */
#include <dev/ath/ath_hal/ah_diagcodes.h>
#include <dev/ath/if_ath_debug.h>
#include <dev/ath/if_ath_misc.h>
#if 0
#include <dev/ath/if_ath_tsf.h>
#include <dev/ath/if_ath_tx.h>
#include <dev/ath/if_ath_sysctl.h>
#include <dev/ath/if_ath_led.h>
#include <dev/ath/if_ath_keycache.h>
#include <dev/ath/if_ath_rx.h>
#include <dev/ath/if_ath_rx_edma.h>
#include <dev/ath/if_ath_tx_edma.h>
#include <dev/ath/if_ath_beacon.h>
#include <dev/ath/if_ath_btcoex.h>
#include <dev/ath/if_ath_spectral.h>
#include <dev/ath/if_ath_lna_div.h>
#include <dev/ath/if_athdfs.h>
#endif
#include <dev/ath/if_ath_descdma.h>
MALLOC_DECLARE(M_ATHDEV);
/*
* This is the descriptor setup / busdma memory intialisation and
* teardown routines.
*/
static void
ath_load_cb(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
{
bus_addr_t *paddr = (bus_addr_t*) arg;
KASSERT(error == 0, ("error %u on bus_dma callback", error));
*paddr = segs->ds_addr;
}
/*
* Allocate the descriptors and appropriate DMA tag/setup.
*
* For some situations (eg EDMA TX completion), there isn't a requirement
* for the ath_buf entries to be allocated.
*/
int
ath_descdma_alloc_desc(struct ath_softc *sc,
struct ath_descdma *dd, ath_bufhead *head,
const char *name, int ds_size, int ndesc)
{
#define DS2PHYS(_dd, _ds) \
((_dd)->dd_desc_paddr + ((caddr_t)(_ds) - (caddr_t)(_dd)->dd_desc))
#define ATH_DESC_4KB_BOUND_CHECK(_daddr, _len) \
((((u_int32_t)(_daddr) & 0xFFF) > (0x1000 - (_len))) ? 1 : 0)
int error;
dd->dd_descsize = ds_size;
DPRINTF(sc, ATH_DEBUG_RESET,
"%s: %s DMA: %u desc, %d bytes per descriptor\n",
__func__, name, ndesc, dd->dd_descsize);
dd->dd_name = name;
dd->dd_desc_len = dd->dd_descsize * ndesc;
/*
* Merlin work-around:
* Descriptors that cross the 4KB boundary can't be used.
* Assume one skipped descriptor per 4KB page.
*/
if (! ath_hal_split4ktrans(sc->sc_ah)) {
int numpages = dd->dd_desc_len / 4096;
dd->dd_desc_len += ds_size * numpages;
}
/*
* Setup DMA descriptor area.
*
* BUS_DMA_ALLOCNOW is not used; we never use bounce
* buffers for the descriptors themselves.
*/
error = bus_dma_tag_create(bus_get_dma_tag(sc->sc_dev), /* parent */
PAGE_SIZE, 0, /* alignment, bounds */
BUS_SPACE_MAXADDR_32BIT, /* lowaddr */
BUS_SPACE_MAXADDR, /* highaddr */
NULL, NULL, /* filter, filterarg */
dd->dd_desc_len, /* maxsize */
1, /* nsegments */
dd->dd_desc_len, /* maxsegsize */
0, /* flags */
NULL, /* lockfunc */
NULL, /* lockarg */
&dd->dd_dmat);
if (error != 0) {
device_printf(sc->sc_dev,
"cannot allocate %s DMA tag\n", dd->dd_name);
return error;
}
/* allocate descriptors */
error = bus_dmamem_alloc(dd->dd_dmat, (void**) &dd->dd_desc,
BUS_DMA_NOWAIT | BUS_DMA_COHERENT,
&dd->dd_dmamap);
if (error != 0) {
device_printf(sc->sc_dev,
"unable to alloc memory for %u %s descriptors, error %u\n",
ndesc, dd->dd_name, error);
goto fail1;
}
error = bus_dmamap_load(dd->dd_dmat, dd->dd_dmamap,
dd->dd_desc, dd->dd_desc_len,
ath_load_cb, &dd->dd_desc_paddr,
BUS_DMA_NOWAIT);
if (error != 0) {
device_printf(sc->sc_dev,
"unable to map %s descriptors, error %u\n",
dd->dd_name, error);
goto fail2;
}
DPRINTF(sc, ATH_DEBUG_RESET, "%s: %s DMA map: %p (%lu) -> %p (%lu)\n",
__func__, dd->dd_name, (uint8_t *) dd->dd_desc,
(u_long) dd->dd_desc_len, (caddr_t) dd->dd_desc_paddr,
/*XXX*/ (u_long) dd->dd_desc_len);
return (0);
fail2:
bus_dmamem_free(dd->dd_dmat, dd->dd_desc, dd->dd_dmamap);
fail1:
bus_dma_tag_destroy(dd->dd_dmat);
memset(dd, 0, sizeof(*dd));
return error;
#undef DS2PHYS
#undef ATH_DESC_4KB_BOUND_CHECK
}
int
ath_descdma_setup(struct ath_softc *sc,
struct ath_descdma *dd, ath_bufhead *head,
const char *name, int ds_size, int nbuf, int ndesc)
{
#define DS2PHYS(_dd, _ds) \
((_dd)->dd_desc_paddr + ((caddr_t)(_ds) - (caddr_t)(_dd)->dd_desc))
#define ATH_DESC_4KB_BOUND_CHECK(_daddr, _len) \
((((u_int32_t)(_daddr) & 0xFFF) > (0x1000 - (_len))) ? 1 : 0)
uint8_t *ds;
struct ath_buf *bf;
int i, bsize, error;
/* Allocate descriptors */
error = ath_descdma_alloc_desc(sc, dd, head, name, ds_size,
nbuf * ndesc);
/* Assume any errors during allocation were dealt with */
if (error != 0) {
return (error);
}
ds = (uint8_t *) dd->dd_desc;
/* allocate rx buffers */
bsize = sizeof(struct ath_buf) * nbuf;
bf = malloc(bsize, M_ATHDEV, M_NOWAIT | M_ZERO);
if (bf == NULL) {
device_printf(sc->sc_dev,
"malloc of %s buffers failed, size %u\n",
dd->dd_name, bsize);
goto fail3;
}
dd->dd_bufptr = bf;
TAILQ_INIT(head);
for (i = 0; i < nbuf; i++, bf++, ds += (ndesc * dd->dd_descsize)) {
bf->bf_desc = (struct ath_desc *) ds;
bf->bf_daddr = DS2PHYS(dd, ds);
if (! ath_hal_split4ktrans(sc->sc_ah)) {
/*
* Merlin WAR: Skip descriptor addresses which
* cause 4KB boundary crossing along any point
* in the descriptor.
*/
if (ATH_DESC_4KB_BOUND_CHECK(bf->bf_daddr,
dd->dd_descsize)) {
/* Start at the next page */
ds += 0x1000 - (bf->bf_daddr & 0xFFF);
bf->bf_desc = (struct ath_desc *) ds;
bf->bf_daddr = DS2PHYS(dd, ds);
}
}
error = bus_dmamap_create(sc->sc_dmat, BUS_DMA_NOWAIT,
&bf->bf_dmamap);
if (error != 0) {
device_printf(sc->sc_dev, "unable to create dmamap "
"for %s buffer %u, error %u\n",
dd->dd_name, i, error);
ath_descdma_cleanup(sc, dd, head);
return error;
}
bf->bf_lastds = bf->bf_desc; /* Just an initial value */
TAILQ_INSERT_TAIL(head, bf, bf_list);
}
/*
* XXX TODO: ensure that ds doesn't overflow the descriptor
* allocation otherwise weird stuff will occur and crash your
* machine.
*/
return 0;
/* XXX this should likely just call ath_descdma_cleanup() */
fail3:
bus_dmamap_unload(dd->dd_dmat, dd->dd_dmamap);
bus_dmamem_free(dd->dd_dmat, dd->dd_desc, dd->dd_dmamap);
bus_dma_tag_destroy(dd->dd_dmat);
memset(dd, 0, sizeof(*dd));
return error;
#undef DS2PHYS
#undef ATH_DESC_4KB_BOUND_CHECK
}
/*
* Allocate ath_buf entries but no descriptor contents.
*
* This is for RX EDMA where the descriptors are the header part of
* the RX buffer.
*/
int
ath_descdma_setup_rx_edma(struct ath_softc *sc,
struct ath_descdma *dd, ath_bufhead *head,
const char *name, int nbuf, int rx_status_len)
{
struct ath_buf *bf;
int i, bsize, error;
DPRINTF(sc, ATH_DEBUG_RESET, "%s: %s DMA: %u buffers\n",
__func__, name, nbuf);
dd->dd_name = name;
/*
* This is (mostly) purely for show. We're not allocating any actual
* descriptors here as EDMA RX has the descriptor be part
* of the RX buffer.
*
* However, dd_desc_len is used by ath_descdma_free() to determine
* whether we have already freed this DMA mapping.
*/
dd->dd_desc_len = rx_status_len * nbuf;
dd->dd_descsize = rx_status_len;
/* allocate rx buffers */
bsize = sizeof(struct ath_buf) * nbuf;
bf = malloc(bsize, M_ATHDEV, M_NOWAIT | M_ZERO);
if (bf == NULL) {
device_printf(sc->sc_dev,
"malloc of %s buffers failed, size %u\n",
dd->dd_name, bsize);
error = ENOMEM;
goto fail3;
}
dd->dd_bufptr = bf;
TAILQ_INIT(head);
for (i = 0; i < nbuf; i++, bf++) {
bf->bf_desc = NULL;
bf->bf_daddr = 0;
bf->bf_lastds = NULL; /* Just an initial value */
error = bus_dmamap_create(sc->sc_dmat, BUS_DMA_NOWAIT,
&bf->bf_dmamap);
if (error != 0) {
device_printf(sc->sc_dev, "unable to create dmamap "
"for %s buffer %u, error %u\n",
dd->dd_name, i, error);
ath_descdma_cleanup(sc, dd, head);
return error;
}
TAILQ_INSERT_TAIL(head, bf, bf_list);
}
return 0;
fail3:
memset(dd, 0, sizeof(*dd));
return error;
}
void
ath_descdma_cleanup(struct ath_softc *sc,
struct ath_descdma *dd, ath_bufhead *head)
{
struct ath_buf *bf;
struct ieee80211_node *ni;
int do_warning = 0;
if (dd->dd_dmamap != 0) {
bus_dmamap_unload(dd->dd_dmat, dd->dd_dmamap);
bus_dmamem_free(dd->dd_dmat, dd->dd_desc, dd->dd_dmamap);
bus_dma_tag_destroy(dd->dd_dmat);
}
if (head != NULL) {
TAILQ_FOREACH(bf, head, bf_list) {
if (bf->bf_m) {
/*
* XXX warn if there's buffers here.
* XXX it should have been freed by the
* owner!
*/
if (do_warning == 0) {
do_warning = 1;
device_printf(sc->sc_dev,
"%s: %s: mbuf should've been"
" unmapped/freed!\n",
__func__,
dd->dd_name);
}
bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap,
BUS_DMASYNC_POSTREAD);
bus_dmamap_unload(sc->sc_dmat, bf->bf_dmamap);
m_freem(bf->bf_m);
bf->bf_m = NULL;
}
if (bf->bf_dmamap != NULL) {
bus_dmamap_destroy(sc->sc_dmat, bf->bf_dmamap);
bf->bf_dmamap = NULL;
}
ni = bf->bf_node;
bf->bf_node = NULL;
if (ni != NULL) {
/*
* Reclaim node reference.
*/
ieee80211_free_node(ni);
}
}
}
if (head != NULL)
TAILQ_INIT(head);
if (dd->dd_bufptr != NULL)
free(dd->dd_bufptr, M_ATHDEV);
memset(dd, 0, sizeof(*dd));
}