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MIPS/jazzdma: decouple from dma-direct 

The jazzdma ops implement support for a very basic IOMMU.  Thus we really
should not use the dma-direct code that takes physical address limits
into account.  This survived through the great MIPS DMA ops cleanup mostly
because I was lazy, but now it is time to fully split the implementations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Christoph Hellwig 2020-08-17 16:51:47 +02:00
parent a4877c44a4
commit 170780be32
1 changed files with 22 additions and 11 deletions
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31
arch/mips/jazz/jazzdma.c
View File

@ -16,7 +16,6 @@
#include <linux/memblock.h>
#include <linux/spinlock.h>
#include <linux/gfp.h>
#include <linux/dma-direct.h>
#include <linux/dma-noncoherent.h>
#include <asm/mipsregs.h>
#include <asm/jazz.h>
@ -492,26 +491,39 @@ int vdma_get_enable(int channel)
static void *jazz_dma_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
{
struct page *page;
void *ret;
ret = dma_direct_alloc_pages(dev, size, dma_handle, gfp, attrs);
if (!ret)
return NULL;
if (attrs & DMA_ATTR_NO_WARN)
gfp |= __GFP_NOWARN;
size = PAGE_ALIGN(size);
page = alloc_pages(gfp, get_order(size));
if (!page)
return NULL;
ret = page_address(page);
memset(ret, 0, size);
*dma_handle = vdma_alloc(virt_to_phys(ret), size);
if (*dma_handle == DMA_MAPPING_ERROR) {
dma_direct_free_pages(dev, size, ret, *dma_handle, attrs);
return NULL;
}
if (*dma_handle == DMA_MAPPING_ERROR)
goto out_free_pages;
if (attrs & DMA_ATTR_NON_CONSISTENT)
return ret;
arch_dma_prep_coherent(page, size);
return (void *)(UNCAC_BASE + __pa(ret));
out_free_pages:
__free_pages(page, get_order(size));
return NULL;
}
static void jazz_dma_free(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle, unsigned long attrs)
{
vdma_free(dma_handle);
dma_direct_free_pages(dev, size, vaddr, dma_handle, attrs);
if (!(attrs & DMA_ATTR_NON_CONSISTENT))
vaddr = __va(vaddr - UNCAC_BASE);
__free_pages(virt_to_page(vaddr), get_order(size));
}
static dma_addr_t jazz_dma_map_page(struct device *dev, struct page *page,
@ -608,7 +620,6 @@ const struct dma_map_ops jazz_dma_ops = {
.sync_single_for_device = jazz_dma_sync_single_for_device,
.sync_sg_for_cpu = jazz_dma_sync_sg_for_cpu,
.sync_sg_for_device = jazz_dma_sync_sg_for_device,
.dma_supported = dma_direct_supported,
.cache_sync = arch_dma_cache_sync,
.mmap = dma_common_mmap,
.get_sgtable = dma_common_get_sgtable,