freebsd-dev/sys/dev/oce/oce_util.c
John Baldwin c34f1a08c6 Fix teardown of static DMA allocations in various NIC drivers:
- Add missing calls to bus_dmamap_unload() in et(4).
- Check the bus address against 0 to decide when to call
  bus_dmamap_unload() instead of comparing the bus_dma map against NULL.
- Check the virtual address against NULL to decide when to call
  bus_dmamem_free() instead of comparing the bus_dma map against NULL.
- Don't clear bus_dma map pointers to NULL for static allocations.
  Instead, treat the value as completely opaque.
- Pass the correct virtual address to bus_dmamem_free() in wpi(4) instead
  of trying to free a pointer to the virtual address.

Reviewed by:	yongari
2014-06-17 14:47:49 +00:00

270 lines
6.0 KiB
C

/*-
* Copyright (C) 2013 Emulex
* 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.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Emulex Corporation nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* 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 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 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 DAMAGE.
*
* Contact Information:
* freebsd-drivers@emulex.com
*
* Emulex
* 3333 Susan Street
* Costa Mesa, CA 92626
*/
/* $FreeBSD$ */
#include "oce_if.h"
static void oce_dma_map_ring(void *arg,
bus_dma_segment_t *segs,
int nseg,
int error);
/**
* @brief Allocate DMA memory
* @param sc software handle to the device
* @param size bus size
* @param dma dma memory area
* @param flags creation flags
* @returns 0 on success, error otherwize
*/
int
oce_dma_alloc(POCE_SOFTC sc, bus_size_t size, POCE_DMA_MEM dma, int flags)
{
int rc;
memset(dma, 0, sizeof(OCE_DMA_MEM));
rc = bus_dma_tag_create(bus_get_dma_tag(sc->dev),
8, 0,
BUS_SPACE_MAXADDR,
BUS_SPACE_MAXADDR,
NULL, NULL,
size, 1, size, 0, NULL, NULL, &dma->tag);
if (rc == 0) {
rc = bus_dmamem_alloc(dma->tag,
&dma->ptr,
BUS_DMA_NOWAIT | BUS_DMA_COHERENT |
BUS_DMA_ZERO,
&dma->map);
}
dma->paddr = 0;
if (rc == 0) {
rc = bus_dmamap_load(dma->tag,
dma->map,
dma->ptr,
size,
oce_dma_map_addr,
&dma->paddr, flags | BUS_DMA_NOWAIT);
if (dma->paddr == 0)
rc = ENXIO;
}
if (rc != 0)
oce_dma_free(sc, dma);
return rc;
}
/**
* @brief Free DMA memory
* @param sc software handle to the device
* @param dma dma area to free
*/
void
oce_dma_free(POCE_SOFTC sc, POCE_DMA_MEM dma)
{
if (dma->tag == NULL)
return;
if (dma->paddr != 0) {
bus_dmamap_sync(dma->tag, dma->map,
BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(dma->tag, dma->map);
dma->paddr = 0;
}
if (dma->ptr != NULL) {
bus_dmamem_free(dma->tag, dma->ptr, dma->map);
dma->ptr = NULL;
}
bus_dma_tag_destroy(dma->tag);
dma->tag = NULL;
return;
}
/**
* @brief Map DMA memory segment addresses
* @param arg physical address pointer
* @param segs dma memory segments
* @param nseg number of dma memory segments
* @param error if error, zeroes the physical address
*/
void
oce_dma_map_addr(void *arg, bus_dma_segment_t * segs, int nseg, int error)
{
bus_addr_t *paddr = arg;
if (error)
*paddr = 0;
else
*paddr = segs->ds_addr;
}
/**
* @brief Destroy a ring buffer
* @param sc software handle to the device
* @param ring ring buffer
*/
void
oce_destroy_ring_buffer(POCE_SOFTC sc, oce_ring_buffer_t *ring)
{
oce_dma_free(sc, &ring->dma);
free(ring, M_DEVBUF);
}
oce_ring_buffer_t *
oce_create_ring_buffer(POCE_SOFTC sc,
uint32_t q_len, uint32_t item_size)
{
uint32_t size = q_len * item_size;
int rc;
oce_ring_buffer_t *ring;
ring = malloc(sizeof(oce_ring_buffer_t), M_DEVBUF, M_NOWAIT | M_ZERO);
if (ring == NULL)
return NULL;
ring->item_size = item_size;
ring->num_items = q_len;
rc = bus_dma_tag_create(bus_get_dma_tag(sc->dev),
4096, 0,
BUS_SPACE_MAXADDR,
BUS_SPACE_MAXADDR,
NULL, NULL,
size, 8, 4096, 0, NULL, NULL, &ring->dma.tag);
if (rc)
goto fail;
rc = bus_dmamem_alloc(ring->dma.tag,
&ring->dma.ptr,
BUS_DMA_NOWAIT | BUS_DMA_COHERENT,
&ring->dma.map);
if (rc)
goto fail;
bzero(ring->dma.ptr, size);
bus_dmamap_sync(ring->dma.tag, ring->dma.map,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
ring->dma.paddr = 0;
return ring;
fail:
oce_dma_free(sc, &ring->dma);
free(ring, M_DEVBUF);
ring = NULL;
return NULL;
}
struct _oce_dmamap_paddr_table {
uint32_t max_entries;
uint32_t num_entries;
struct phys_addr *paddrs;
};
/**
* @brief Map ring buffer
* @param arg dma map phyical address table pointer
* @param segs dma memory segments
* @param nseg number of dma memory segments
* @param error maps only if error is 0
*/
static void
oce_dma_map_ring(void *arg, bus_dma_segment_t * segs, int nseg, int error)
{
int i;
struct _oce_dmamap_paddr_table *dpt =
(struct _oce_dmamap_paddr_table *)arg;
if (error == 0) {
if (nseg <= dpt->max_entries) {
for (i = 0; i < nseg; i++) {
dpt->paddrs[i].lo = ADDR_LO(segs[i].ds_addr);
dpt->paddrs[i].hi = ADDR_HI(segs[i].ds_addr);
}
dpt->num_entries = nseg;
}
}
}
/**
* @brief Load bus dma map for a ring buffer
* @param ring ring buffer pointer
* @param pa_list physical address list
* @returns number entries
*/
uint32_t
oce_page_list(oce_ring_buffer_t *ring, struct phys_addr *pa_list)
{
struct _oce_dmamap_paddr_table dpt;
dpt.max_entries = 8;
dpt.num_entries = 0;
dpt.paddrs = pa_list;
bus_dmamap_load(ring->dma.tag,
ring->dma.map,
ring->dma.ptr,
ring->item_size * ring->num_items,
oce_dma_map_ring, &dpt, BUS_DMA_NOWAIT);
return dpt.num_entries;
}