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sparc: remove the sparc32_dma_ops indirection

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There is no good reason to have a double indirection for the sparc32
dma ops, so remove the sparc32_dma_ops and define separate dma_map_ops
instance for the different IOMMU types.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig
2018-12-03 14:04:32 +01:00
parent 53b7670e57
commit ce65d36f3e
4 changed files with 138 additions and 236 deletions
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124
arch/sparc/kernel/ioport.c
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@@ -52,8 +52,6 @@
#include <asm/io-unit.h>
#include <asm/leon.h>
const struct sparc32_dma_ops *sparc32_dma_ops;
/* This function must make sure that caches and memory are coherent after DMA
* On LEON systems without cache snooping it flushes the entire D-CACHE.
*/
@@ -247,7 +245,7 @@ static void _sparc_free_io(struct resource *res)
release_resource(res);
}
static unsigned long sparc_dma_alloc_resource(struct device *dev, size_t len)
unsigned long sparc_dma_alloc_resource(struct device *dev, size_t len)
{
struct resource *res;
@@ -266,7 +264,7 @@ static unsigned long sparc_dma_alloc_resource(struct device *dev, size_t len)
return res->start;
}
static bool sparc_dma_free_resource(void *cpu_addr, size_t size)
bool sparc_dma_free_resource(void *cpu_addr, size_t size)
{
unsigned long addr = (unsigned long)cpu_addr;
struct resource *res;
@@ -302,122 +300,6 @@ void sbus_set_sbus64(struct device *dev, int x)
}
EXPORT_SYMBOL(sbus_set_sbus64);
/*
* Allocate a chunk of memory suitable for DMA.
* Typically devices use them for control blocks.
* CPU may access them without any explicit flushing.
*/
static void *sbus_alloc_coherent(struct device *dev, size_t len,
dma_addr_t *dma_addrp, gfp_t gfp,
unsigned long attrs)
{
unsigned long len_total = PAGE_ALIGN(len);
unsigned long va, addr;
int order;
/* XXX why are some lengths signed, others unsigned? */
if (len <= 0) {
return NULL;
}
/* XXX So what is maxphys for us and how do drivers know it? */
if (len > 256*1024) { /* __get_free_pages() limit */
return NULL;
}
order = get_order(len_total);
va = __get_free_pages(gfp, order);
if (va == 0)
goto err_nopages;
addr = sparc_dma_alloc_resource(dev, len_total);
if (!addr)
goto err_nomem;
// XXX The sbus_map_dma_area does this for us below, see comments.
// srmmu_mapiorange(0, virt_to_phys(va), res->start, len_total);
/*
* XXX That's where sdev would be used. Currently we load
* all iommu tables with the same translations.
*/
if (sbus_map_dma_area(dev, dma_addrp, va, addr, len_total) != 0)
goto err_noiommu;
return (void *)addr;
err_noiommu:
sparc_dma_free_resource((void *)addr, len_total);
err_nomem:
free_pages(va, order);
err_nopages:
return NULL;
}
static void sbus_free_coherent(struct device *dev, size_t n, void *p,
dma_addr_t ba, unsigned long attrs)
{
struct page *pgv;
n = PAGE_ALIGN(n);
if (!sparc_dma_free_resource(p, n))
return;
pgv = virt_to_page(p);
sbus_unmap_dma_area(dev, ba, n);
__free_pages(pgv, get_order(n));
}
/*
* Map a chunk of memory so that devices can see it.
* CPU view of this memory may be inconsistent with
* a device view and explicit flushing is necessary.
*/
static dma_addr_t sbus_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t len,
enum dma_data_direction dir,
unsigned long attrs)
{
void *va = page_address(page) + offset;
/* XXX why are some lengths signed, others unsigned? */
if (len <= 0) {
return 0;
}
/* XXX So what is maxphys for us and how do drivers know it? */
if (len > 256*1024) { /* __get_free_pages() limit */
return 0;
}
return mmu_get_scsi_one(dev, va, len);
}
static void sbus_unmap_page(struct device *dev, dma_addr_t ba, size_t n,
enum dma_data_direction dir, unsigned long attrs)
{
mmu_release_scsi_one(dev, ba, n);
}
static int sbus_map_sg(struct device *dev, struct scatterlist *sg, int n,
enum dma_data_direction dir, unsigned long attrs)
{
mmu_get_scsi_sgl(dev, sg, n);
return n;
}
static void sbus_unmap_sg(struct device *dev, struct scatterlist *sg, int n,
enum dma_data_direction dir, unsigned long attrs)
{
mmu_release_scsi_sgl(dev, sg, n);
}
static const struct dma_map_ops sbus_dma_ops = {
.alloc = sbus_alloc_coherent,
.free = sbus_free_coherent,
.map_page = sbus_map_page,
.unmap_page = sbus_unmap_page,
.map_sg = sbus_map_sg,
.unmap_sg = sbus_unmap_sg,
};
static int __init sparc_register_ioport(void)
{
register_proc_sparc_ioport();
@@ -491,7 +373,7 @@ void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
dma_make_coherent(paddr, PAGE_ALIGN(size));
}
const struct dma_map_ops *dma_ops = &sbus_dma_ops;
const struct dma_map_ops *dma_ops;
EXPORT_SYMBOL(dma_ops);
#ifdef CONFIG_PROC_FS