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authorLinus Torvalds <torvalds@linux-foundation.org>2021-11-09 10:56:41 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2021-11-09 10:56:41 -0800
commit372594985c786b40108a5201ca3192223d6c0c40 (patch)
tree86ec652db339a5fa58b4b2cee3d85c2b75a22bef /arch
parent1bdd629e5aa0e335504304be4208935948692549 (diff)
parent9fbd8dc19aa57ec8fe92606043199919527cd9be (diff)
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
Diffstat (limited to 'arch')
-rw-r--r--arch/sparc/Kconfig3
-rw-r--r--arch/sparc/kernel/ioport.c76
2 files changed, 10 insertions, 69 deletions
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index b120ed947f50..66fc08646be5 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -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
diff --git a/arch/sparc/kernel/ioport.c b/arch/sparc/kernel/ioport.c
index 7ceae24b0ca9..57a72c46eddb 100644
--- a/arch/sparc/kernel/ioport.c
+++ b/arch/sparc/kernel/ioport.c
@@ -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