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dma-mapping updates for Linux 5.16

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- convert sparc32 to the generic dma-direct code
  - use bitmap_zalloc (Christophe JAILLET)
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Merge tag 'dma-mapping-5.16' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping updates from Christoph Hellwig:
 "Just a small set of changes this time. The request dma_direct_alloc
  cleanups are still under review and haven't made the cut.

  Summary:

   - convert sparc32 to the generic dma-direct code

   - use bitmap_zalloc (Christophe JAILLET)"

* tag 'dma-mapping-5.16' of git://git.infradead.org/users/hch/dma-mapping:
  dma-mapping: use 'bitmap_zalloc()' when applicable
  sparc32: use DMA_DIRECT_REMAP
  sparc32: remove dma_make_coherent
  sparc32: remove the call to dma_make_coherent in arch_dma_free
This commit is contained in:
Linus Torvalds 2021-11-09 10:56:41 -08:00
commit 372594985c
3 changed files with 12 additions and 72 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/sparc/Kconfig
View File

@ -53,8 +53,9 @@ config SPARC32
def_bool !64BIT
select ARCH_32BIT_OFF_T
select ARCH_HAS_SYNC_DMA_FOR_CPU
select GENERIC_ATOMIC64
select CLZ_TAB
select DMA_DIRECT_REMAP
select GENERIC_ATOMIC64
select HAVE_UID16
select OLD_SIGACTION
select ZONE_DMA

76
arch/sparc/kernel/ioport.c
View File

@ -52,17 +52,6 @@
#include <asm/io-unit.h>
#include <asm/leon.h>
/* 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.
*/
static inline void dma_make_coherent(unsigned long pa, unsigned long len)
{
if (sparc_cpu_model == sparc_leon) {
if (!sparc_leon3_snooping_enabled())
leon_flush_dcache_all();
}
}
static void __iomem *_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz);
static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
unsigned long size, char *name);
@ -311,68 +300,19 @@ arch_initcall(sparc_register_ioport);
#endif /* CONFIG_SBUS */
/* Allocate and map kernel buffer using consistent mode DMA for a device.
* hwdev should be valid struct pci_dev pointer for PCI devices.
*/
void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t gfp, unsigned long attrs)
{
unsigned long addr;
void *va;
if (!size || size > 256 * 1024) /* __get_free_pages() limit */
return NULL;
size = PAGE_ALIGN(size);
va = (void *) __get_free_pages(gfp | __GFP_ZERO, get_order(size));
if (!va) {
printk("%s: no %zd pages\n", __func__, size >> PAGE_SHIFT);
return NULL;
}
addr = sparc_dma_alloc_resource(dev, size);
if (!addr)
goto err_nomem;
srmmu_mapiorange(0, virt_to_phys(va), addr, size);
*dma_handle = virt_to_phys(va);
return (void *)addr;
err_nomem:
free_pages((unsigned long)va, get_order(size));
return NULL;
}
/* Free and unmap a consistent DMA buffer.
* cpu_addr is what was returned arch_dma_alloc, size must be the same as what
* was passed into arch_dma_alloc, and likewise dma_addr must be the same as
* what *dma_ndler was set to.
/*
* IIep is write-through, not flushing on cpu to device transfer.
*
* References to the memory and mappings associated with cpu_addr/dma_addr
* past this call are illegal.
* On LEON systems without cache snooping, the entire D-CACHE must be flushed to
* make DMA to cacheable memory coherent.
*/
void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_addr, unsigned long attrs)
{
size = PAGE_ALIGN(size);
if (!sparc_dma_free_resource(cpu_addr, size))
return;
dma_make_coherent(dma_addr, size);
srmmu_unmapiorange((unsigned long)cpu_addr, size);
free_pages((unsigned long)phys_to_virt(dma_addr), get_order(size));
}
/* IIep is write-through, not flushing on cpu to device transfer. */
void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
enum dma_data_direction dir)
{
if (dir != PCI_DMA_TODEVICE)
dma_make_coherent(paddr, PAGE_ALIGN(size));
if (dir != PCI_DMA_TODEVICE &&
sparc_cpu_model == sparc_leon &&
!sparc_leon3_snooping_enabled())
leon_flush_dcache_all();
}
#ifdef CONFIG_PROC_FS

5
kernel/dma/coherent.c
View File

@ -40,7 +40,6 @@ static struct dma_coherent_mem *dma_init_coherent_memory(phys_addr_t phys_addr,
{
struct dma_coherent_mem *dma_mem;
int pages = size >> PAGE_SHIFT;
int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
void *mem_base;
if (!size)
@ -53,7 +52,7 @@ static struct dma_coherent_mem *dma_init_coherent_memory(phys_addr_t phys_addr,
dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL);
if (!dma_mem)
goto out_unmap_membase;
dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
dma_mem->bitmap = bitmap_zalloc(pages, GFP_KERNEL);
if (!dma_mem->bitmap)
goto out_free_dma_mem;
@ -81,7 +80,7 @@ static void dma_release_coherent_memory(struct dma_coherent_mem *mem)
return;
memunmap(mem->virt_base);
kfree(mem->bitmap);
bitmap_free(mem->bitmap);
kfree(mem);
}