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Provide a template for busdma code for RISC-V.

Browse Source 
RISC-V ISA specifies no cache management instructions so leave cache
operations in cpufunc.h as no-op for now.

Note some new hardware comes with their own memory-mapped cache
management controller.

Tested on HiFive Unleashed board with cgem(4).

Reviewed by:	markj
Obtained from:	arm64
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D20126
This commit is contained in:
br 2019-05-07 13:41:43 +00:00
parent 4b1a9bdef5
commit 64cb3b9636
7 changed files with 1747 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
sys/conf/files.riscv
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@ -28,6 +28,7 @@ libkern/memset.c standard
riscv/riscv/autoconf.c standard
riscv/riscv/bus_machdep.c standard
riscv/riscv/bus_space_asm.S standard
riscv/riscv/busdma_bounce.c standard
riscv/riscv/busdma_machdep.c standard
riscv/riscv/clock.c standard
riscv/riscv/copyinout.S standard

134
sys/riscv/include/bus_dma.h
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@ -3,7 +3,139 @@
#ifndef _MACHINE_BUS_DMA_H_
#define _MACHINE_BUS_DMA_H_
#define WANT_INLINE_DMAMAP
#include <sys/bus_dma.h>
#include <sys/bus_dma_internal.h>
#include <machine/bus_dma_impl.h>
/*
* Allocate a handle for mapping from kva/uva/physical
* address space into bus device space.
*/
static inline int
bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp)
{
struct bus_dma_tag_common *tc;
tc = (struct bus_dma_tag_common *)dmat;
return (tc->impl->map_create(dmat, flags, mapp));
}
/*
* Destroy a handle for mapping from kva/uva/physical
* address space into bus device space.
*/
static inline int
bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map)
{
struct bus_dma_tag_common *tc;
tc = (struct bus_dma_tag_common *)dmat;
return (tc->impl->map_destroy(dmat, map));
}
/*
* Allocate a piece of memory that can be efficiently mapped into
* bus device space based on the constraints listed in the dma tag.
* A dmamap to for use with dmamap_load is also allocated.
*/
static inline int
bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
bus_dmamap_t *mapp)
{
struct bus_dma_tag_common *tc;
tc = (struct bus_dma_tag_common *)dmat;
return (tc->impl->mem_alloc(dmat, vaddr, flags, mapp));
}
/*
* Free a piece of memory and it's allociated dmamap, that was allocated
* via bus_dmamem_alloc. Make the same choice for free/contigfree.
*/
static inline void
bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map)
{
struct bus_dma_tag_common *tc;
tc = (struct bus_dma_tag_common *)dmat;
tc->impl->mem_free(dmat, vaddr, map);
}
/*
* Release the mapping held by map.
*/
static inline void
bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map)
{
struct bus_dma_tag_common *tc;
tc = (struct bus_dma_tag_common *)dmat;
tc->impl->map_unload(dmat, map);
}
static inline void
bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op)
{
struct bus_dma_tag_common *tc;
tc = (struct bus_dma_tag_common *)dmat;
tc->impl->map_sync(dmat, map, op);
}
static inline int
_bus_dmamap_load_phys(bus_dma_tag_t dmat, bus_dmamap_t map, vm_paddr_t buf,
bus_size_t buflen, int flags, bus_dma_segment_t *segs, int *segp)
{
struct bus_dma_tag_common *tc;
tc = (struct bus_dma_tag_common *)dmat;
return (tc->impl->load_phys(dmat, map, buf, buflen, flags, segs,
segp));
}
static inline int
_bus_dmamap_load_ma(bus_dma_tag_t dmat, bus_dmamap_t map, struct vm_page **ma,
bus_size_t tlen, int ma_offs, int flags, bus_dma_segment_t *segs,
int *segp)
{
struct bus_dma_tag_common *tc;
tc = (struct bus_dma_tag_common *)dmat;
return (tc->impl->load_ma(dmat, map, ma, tlen, ma_offs, flags,
segs, segp));
}
static inline int
_bus_dmamap_load_buffer(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
bus_size_t buflen, struct pmap *pmap, int flags, bus_dma_segment_t *segs,
int *segp)
{
struct bus_dma_tag_common *tc;
tc = (struct bus_dma_tag_common *)dmat;
return (tc->impl->load_buffer(dmat, map, buf, buflen, pmap, flags, segs,
segp));
}
static inline void
_bus_dmamap_waitok(bus_dma_tag_t dmat, bus_dmamap_t map,
struct memdesc *mem, bus_dmamap_callback_t *callback, void *callback_arg)
{
struct bus_dma_tag_common *tc;
tc = (struct bus_dma_tag_common *)dmat;
tc->impl->map_waitok(dmat, map, mem, callback, callback_arg);
}
static inline bus_dma_segment_t *
_bus_dmamap_complete(bus_dma_tag_t dmat, bus_dmamap_t map,
bus_dma_segment_t *segs, int nsegs, int error)
{
struct bus_dma_tag_common *tc;
tc = (struct bus_dma_tag_common *)dmat;
return (tc->impl->map_complete(dmat, map, segs, nsegs, error));
}
#endif /* !_MACHINE_BUS_DMA_H_ */

96
sys/riscv/include/bus_dma_impl.h Normal file
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@ -0,0 +1,96 @@
/*-
* Copyright (c) 2013 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Konstantin Belousov <kib@FreeBSD.org>
* under sponsorship from the FreeBSD Foundation.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#ifndef _MACHINE_BUS_DMA_IMPL_H_
#define _MACHINE_BUS_DMA_IMPL_H_
struct bus_dma_tag_common {
struct bus_dma_impl *impl;
struct bus_dma_tag_common *parent;
bus_size_t alignment;
bus_addr_t boundary;
bus_addr_t lowaddr;
bus_addr_t highaddr;
bus_dma_filter_t *filter;
void *filterarg;
bus_size_t maxsize;
u_int nsegments;
bus_size_t maxsegsz;
int flags;
bus_dma_lock_t *lockfunc;
void *lockfuncarg;
int ref_count;
};
struct bus_dma_impl {
int (*tag_create)(bus_dma_tag_t parent,
bus_size_t alignment, bus_addr_t boundary, bus_addr_t lowaddr,
bus_addr_t highaddr, bus_dma_filter_t *filter,
void *filterarg, bus_size_t maxsize, int nsegments,
bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc,
void *lockfuncarg, bus_dma_tag_t *dmat);
int (*tag_destroy)(bus_dma_tag_t dmat);
int (*map_create)(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
int (*map_destroy)(bus_dma_tag_t dmat, bus_dmamap_t map);
int (*mem_alloc)(bus_dma_tag_t dmat, void** vaddr, int flags,
bus_dmamap_t *mapp);
void (*mem_free)(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
int (*load_ma)(bus_dma_tag_t dmat, bus_dmamap_t map,
struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
bus_dma_segment_t *segs, int *segp);
int (*load_phys)(bus_dma_tag_t dmat, bus_dmamap_t map,
vm_paddr_t buf, bus_size_t buflen, int flags,
bus_dma_segment_t *segs, int *segp);
int (*load_buffer)(bus_dma_tag_t dmat, bus_dmamap_t map,
void *buf, bus_size_t buflen, struct pmap *pmap, int flags,
bus_dma_segment_t *segs, int *segp);
void (*map_waitok)(bus_dma_tag_t dmat, bus_dmamap_t map,
struct memdesc *mem, bus_dmamap_callback_t *callback,
void *callback_arg);
bus_dma_segment_t *(*map_complete)(bus_dma_tag_t dmat, bus_dmamap_t map,
bus_dma_segment_t *segs, int nsegs, int error);
void (*map_unload)(bus_dma_tag_t dmat, bus_dmamap_t map);
void (*map_sync)(bus_dma_tag_t dmat, bus_dmamap_t map,
bus_dmasync_op_t op);
};
void bus_dma_dflt_lock(void *arg, bus_dma_lock_op_t op);
int bus_dma_run_filter(struct bus_dma_tag_common *dmat, bus_addr_t paddr);
int common_bus_dma_tag_create(struct bus_dma_tag_common *parent,
bus_size_t alignment,
bus_addr_t boundary, bus_addr_t lowaddr, bus_addr_t highaddr,
bus_dma_filter_t *filter, void *filterarg, bus_size_t maxsize,
int nsegments, bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc,
void *lockfuncarg, size_t sz, void **dmat);
extern struct bus_dma_impl bus_dma_bounce_impl;
#endif

11
sys/riscv/include/cpufunc.h
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@ -109,6 +109,17 @@ sfence_vma_page(uintptr_t addr)
#define rdinstret() csr_read64(instret)
#define rdhpmcounter(n) csr_read64(hpmcounter##n)
extern int64_t dcache_line_size;
extern int64_t icache_line_size;
#define cpu_dcache_wbinv_range(a, s)
#define cpu_dcache_inv_range(a, s)
#define cpu_dcache_wb_range(a, s)
#define cpu_idcache_wbinv_range(a, s)
#define cpu_icache_sync_range(a, s)
#define cpu_icache_sync_range_checked(a, s)
static __inline void
load_satp(uint64_t val)
{

1330
sys/riscv/riscv/busdma_bounce.c Normal file
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File diff suppressed because it is too large Load Diff

215
sys/riscv/riscv/busdma_machdep.c
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@ -1,5 +1,13 @@
/*-
* Copyright (c) 1997, 1998 Justin T. Gibbs.
* Copyright (c) 2013, 2015 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Konstantin Belousov <kib@FreeBSD.org>
* under sponsorship from the FreeBSD Foundation.
*
* Portions of this software were developed by Semihalf
* under sponsorship of the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -41,62 +49,183 @@ __FBSDID("$FreeBSD$");
#include <vm/pmap.h>
#include <machine/bus.h>
#include <machine/bus_dma_impl.h>
int
_bus_dmamap_load_phys(bus_dma_tag_t dmat, bus_dmamap_t map, vm_paddr_t buf,
bus_size_t buflen, int flags, bus_dma_segment_t *segs, int *segp)
{
panic("busdma");
}
int
_bus_dmamap_load_ma(bus_dma_tag_t dmat, bus_dmamap_t map, struct vm_page **ma,
bus_size_t tlen, int ma_offs, int flags, bus_dma_segment_t *segs,
int *segp)
{
panic("busdma");
}
int
_bus_dmamap_load_buffer(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
bus_size_t buflen, pmap_t pmap, int flags, bus_dma_segment_t *segs,
int *segp)
{
panic("busdma");
}
/*
* Convenience function for manipulating driver locks from busdma (during
* busdma_swi, for example). Drivers that don't provide their own locks
* should specify &Giant to dmat->lockfuncarg. Drivers that use their own
* non-mutex locking scheme don't have to use this at all.
*/
void
_bus_dmamap_waitok(bus_dma_tag_t dmat, bus_dmamap_t map,
struct memdesc *mem, bus_dmamap_callback_t *callback, void *callback_arg)
busdma_lock_mutex(void *arg, bus_dma_lock_op_t op)
{
struct mtx *dmtx;
panic("busdma");
}
bus_dma_segment_t *
_bus_dmamap_complete(bus_dma_tag_t dmat, bus_dmamap_t map,
bus_dma_segment_t *segs, int nsegs, int error)
{
panic("busdma");
dmtx = (struct mtx *)arg;
switch (op) {
case BUS_DMA_LOCK:
mtx_lock(dmtx);
break;
case BUS_DMA_UNLOCK:
mtx_unlock(dmtx);
break;
default:
panic("Unknown operation 0x%x for busdma_lock_mutex!", op);
}
}
/*
* Release the mapping held by map.
* dflt_lock should never get called. It gets put into the dma tag when
* lockfunc == NULL, which is only valid if the maps that are associated
* with the tag are meant to never be defered.
* XXX Should have a way to identify which driver is responsible here.
*/
void
bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map)
bus_dma_dflt_lock(void *arg, bus_dma_lock_op_t op)
{
panic("busdma");
panic("driver error: busdma dflt_lock called");
}
void
bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op)
/*
* Return true if a match is made.
*
* To find a match walk the chain of bus_dma_tag_t's looking for 'paddr'.
*
* If paddr is within the bounds of the dma tag then call the filter callback
* to check for a match, if there is no filter callback then assume a match.
*/
int
bus_dma_run_filter(struct bus_dma_tag_common *tc, bus_addr_t paddr)
{
int retval;
retval = 0;
do {
if (((paddr > tc->lowaddr && paddr <= tc->highaddr) ||
((paddr & (tc->alignment - 1)) != 0)) &&
(tc->filter == NULL ||
(*tc->filter)(tc->filterarg, paddr) != 0))
retval = 1;
tc = tc->parent;
} while (retval == 0 && tc != NULL);
return (retval);
}
int
common_bus_dma_tag_create(struct bus_dma_tag_common *parent,
bus_size_t alignment, bus_addr_t boundary, bus_addr_t lowaddr,
bus_addr_t highaddr, bus_dma_filter_t *filter, void *filterarg,
bus_size_t maxsize, int nsegments, bus_size_t maxsegsz, int flags,
bus_dma_lock_t *lockfunc, void *lockfuncarg, size_t sz, void **dmat)
{
void *newtag;
struct bus_dma_tag_common *common;
KASSERT(sz >= sizeof(struct bus_dma_tag_common), ("sz"));
/* Return a NULL tag on failure */
*dmat = NULL;
/* Basic sanity checking */
if (boundary != 0 && boundary < maxsegsz)
maxsegsz = boundary;
if (maxsegsz == 0)
return (EINVAL);
newtag = malloc(sz, M_DEVBUF, M_ZERO | M_NOWAIT);
if (newtag == NULL) {
CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d",
__func__, newtag, 0, ENOMEM);
return (ENOMEM);
}
common = newtag;
common->impl = &bus_dma_bounce_impl;
common->parent = parent;
common->alignment = alignment;
common->boundary = boundary;
common->lowaddr = trunc_page((vm_paddr_t)lowaddr) + (PAGE_SIZE - 1);
common->highaddr = trunc_page((vm_paddr_t)highaddr) + (PAGE_SIZE - 1);
common->filter = filter;
common->filterarg = filterarg;
common->maxsize = maxsize;
common->nsegments = nsegments;
common->maxsegsz = maxsegsz;
common->flags = flags;
common->ref_count = 1; /* Count ourself */
if (lockfunc != NULL) {
common->lockfunc = lockfunc;
common->lockfuncarg = lockfuncarg;
} else {
common->lockfunc = bus_dma_dflt_lock;
common->lockfuncarg = NULL;
}
/* Take into account any restrictions imposed by our parent tag */
if (parent != NULL) {
common->impl = parent->impl;
common->lowaddr = MIN(parent->lowaddr, common->lowaddr);
common->highaddr = MAX(parent->highaddr, common->highaddr);
if (common->boundary == 0)
common->boundary = parent->boundary;
else if (parent->boundary != 0) {
common->boundary = MIN(parent->boundary,
common->boundary);
}
if (common->filter == NULL) {
/*
* Short circuit looking at our parent directly
* since we have encapsulated all of its information
*/
common->filter = parent->filter;
common->filterarg = parent->filterarg;
common->parent = parent->parent;
}
atomic_add_int(&parent->ref_count, 1);
}
*dmat = common;
return (0);
}
/*
* Allocate a device specific dma_tag.
*/
int
bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
bus_addr_t boundary, bus_addr_t lowaddr, bus_addr_t highaddr,
bus_dma_filter_t *filter, void *filterarg, bus_size_t maxsize,
int nsegments, bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc,
void *lockfuncarg, bus_dma_tag_t *dmat)
{
struct bus_dma_tag_common *tc;
int error;
if (parent == NULL) {
error = bus_dma_bounce_impl.tag_create(parent, alignment,
boundary, lowaddr, highaddr, filter, filterarg, maxsize,
nsegments, maxsegsz, flags, lockfunc, lockfuncarg, dmat);
} else {
tc = (struct bus_dma_tag_common *)parent;
error = tc->impl->tag_create(parent, alignment,
boundary, lowaddr, highaddr, filter, filterarg, maxsize,
nsegments, maxsegsz, flags, lockfunc, lockfuncarg, dmat);
}
return (error);
}
int
bus_dma_tag_destroy(bus_dma_tag_t dmat)
{
struct bus_dma_tag_common *tc;
tc = (struct bus_dma_tag_common *)dmat;
return (tc->impl->tag_destroy(dmat));
}
int
bus_dma_tag_set_domain(bus_dma_tag_t dmat, int domain)
{
panic("busdma");
return (0);
}

4
sys/riscv/riscv/machdep.c
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@ -732,6 +732,10 @@ cache_setup(void)
{
/* TODO */
dcache_line_size = 0;
icache_line_size = 0;
idcache_line_size = 0;
}
/*