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authorLinus Torvalds <torvalds@linux-foundation.org>2018-10-22 18:16:03 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2018-10-22 18:16:03 +0100
commitcff229491af5df946781edfbeafd43e9cf66a3b4 (patch)
treedff787191eb78a69c054510a9ea74cc391330b73 /arch/hexagon/kernel
parentMerge tag 'for-4.20/libata-20181021' of git://git.kernel.dk/linux-block (diff)
parentdma-direct: respect DMA_ATTR_NO_WARN (diff)
downloadlinux-dev-cff229491af5df946781edfbeafd43e9cf66a3b4.tar.xz
linux-dev-cff229491af5df946781edfbeafd43e9cf66a3b4.zip
Merge tag 'dma-mapping-4.20' of git://git.infradead.org/users/hch/dma-mapping
Pull dma mapping updates from Christoph Hellwig: "First batch of dma-mapping changes for 4.20. There will be a second PR as some big changes were only applied just before the end of the merge window, and I want to give them a few more days in linux-next. Summary: - mostly more consolidation of the direct mapping code, including converting over hexagon, and merging the coherent and non-coherent code into a single dma_map_ops instance (me) - cleanups for the dma_configure/dma_unconfigure callchains (me) - better handling of dma_masks in odd setups (me, Alexander Duyck) - better debugging of passing vmalloc address to the DMA API (Stephen Boyd) - CMA command line parsing fix (He Zhe)" * tag 'dma-mapping-4.20' of git://git.infradead.org/users/hch/dma-mapping: (27 commits) dma-direct: respect DMA_ATTR_NO_WARN dma-mapping: translate __GFP_NOFAIL to DMA_ATTR_NO_WARN dma-direct: document the zone selection logic dma-debug: Check for drivers mapping invalid addresses in dma_map_single() dma-direct: fix return value of dma_direct_supported dma-mapping: move dma_default_get_required_mask under ifdef dma-direct: always allow dma mask <= physiscal memory size dma-direct: implement complete bus_dma_mask handling dma-direct: refine dma_direct_alloc zone selection dma-direct: add an explicit dma_direct_get_required_mask dma-mapping: make the get_required_mask method available unconditionally unicore32: remove swiotlb support Revert "dma-mapping: clear dev->dma_ops in arch_teardown_dma_ops" dma-mapping: support non-coherent devices in dma_common_get_sgtable dma-mapping: consolidate the dma mmap implementations dma-mapping: merge direct and noncoherent ops dma-mapping: move the dma_coherent flag to struct device MIPS: don't select DMA_MAYBE_COHERENT from DMA_PERDEV_COHERENT dma-mapping: add the missing ARCH_HAS_SYNC_DMA_FOR_CPU_ALL declaration dma-mapping: fix panic caused by passing empty cma command line argument ...
Diffstat (limited to 'arch/hexagon/kernel')
-rw-r--r--arch/hexagon/kernel/dma.c143
1 files changed, 8 insertions, 135 deletions
diff --git a/arch/hexagon/kernel/dma.c b/arch/hexagon/kernel/dma.c
index 7ebe7ad19d15..706699374444 100644
--- a/arch/hexagon/kernel/dma.c
+++ b/arch/hexagon/kernel/dma.c
@@ -18,32 +18,19 @@
* 02110-1301, USA.
*/
-#include <linux/dma-mapping.h>
-#include <linux/dma-direct.h>
+#include <linux/dma-noncoherent.h>
#include <linux/bootmem.h>
#include <linux/genalloc.h>
-#include <asm/dma-mapping.h>
#include <linux/module.h>
#include <asm/page.h>
-#define HEXAGON_MAPPING_ERROR 0
-
-const struct dma_map_ops *dma_ops;
-EXPORT_SYMBOL(dma_ops);
-
-static inline void *dma_addr_to_virt(dma_addr_t dma_addr)
-{
- return phys_to_virt((unsigned long) dma_addr);
-}
-
static struct gen_pool *coherent_pool;
/* Allocates from a pool of uncached memory that was reserved at boot time */
-static void *hexagon_dma_alloc_coherent(struct device *dev, size_t size,
- dma_addr_t *dma_addr, gfp_t flag,
- unsigned long attrs)
+void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_addr,
+ gfp_t flag, unsigned long attrs)
{
void *ret;
@@ -75,58 +62,17 @@ static void *hexagon_dma_alloc_coherent(struct device *dev, size_t size,
return ret;
}
-static void hexagon_free_coherent(struct device *dev, size_t size, void *vaddr,
- dma_addr_t dma_addr, unsigned long attrs)
+void arch_dma_free(struct device *dev, size_t size, void *vaddr,
+ dma_addr_t dma_addr, unsigned long attrs)
{
gen_pool_free(coherent_pool, (unsigned long) vaddr, size);
}
-static int check_addr(const char *name, struct device *hwdev,
- dma_addr_t bus, size_t size)
-{
- if (hwdev && hwdev->dma_mask && !dma_capable(hwdev, bus, size)) {
- if (*hwdev->dma_mask >= DMA_BIT_MASK(32))
- printk(KERN_ERR
- "%s: overflow %Lx+%zu of device mask %Lx\n",
- name, (long long)bus, size,
- (long long)*hwdev->dma_mask);
- return 0;
- }
- return 1;
-}
-
-static int hexagon_map_sg(struct device *hwdev, struct scatterlist *sg,
- int nents, enum dma_data_direction dir,
- unsigned long attrs)
+void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
+ size_t size, enum dma_data_direction dir)
{
- struct scatterlist *s;
- int i;
-
- WARN_ON(nents == 0 || sg[0].length == 0);
-
- for_each_sg(sg, s, nents, i) {
- s->dma_address = sg_phys(s);
- if (!check_addr("map_sg", hwdev, s->dma_address, s->length))
- return 0;
-
- s->dma_length = s->length;
+ void *addr = phys_to_virt(paddr);
- if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
- continue;
-
- flush_dcache_range(dma_addr_to_virt(s->dma_address),
- dma_addr_to_virt(s->dma_address + s->length));
- }
-
- return nents;
-}
-
-/*
- * address is virtual
- */
-static inline void dma_sync(void *addr, size_t size,
- enum dma_data_direction dir)
-{
switch (dir) {
case DMA_TO_DEVICE:
hexagon_clean_dcache_range((unsigned long) addr,
@@ -144,76 +90,3 @@ static inline void dma_sync(void *addr, size_t size,
BUG();
}
}
-
-/**
- * hexagon_map_page() - maps an address for device DMA
- * @dev: pointer to DMA device
- * @page: pointer to page struct of DMA memory
- * @offset: offset within page
- * @size: size of memory to map
- * @dir: transfer direction
- * @attrs: pointer to DMA attrs (not used)
- *
- * Called to map a memory address to a DMA address prior
- * to accesses to/from device.
- *
- * We don't particularly have many hoops to jump through
- * so far. Straight translation between phys and virtual.
- *
- * DMA is not cache coherent so sync is necessary; this
- * seems to be a convenient place to do it.
- *
- */
-static dma_addr_t hexagon_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t size,
- enum dma_data_direction dir,
- unsigned long attrs)
-{
- dma_addr_t bus = page_to_phys(page) + offset;
- WARN_ON(size == 0);
-
- if (!check_addr("map_single", dev, bus, size))
- return HEXAGON_MAPPING_ERROR;
-
- if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- dma_sync(dma_addr_to_virt(bus), size, dir);
-
- return bus;
-}
-
-static void hexagon_sync_single_for_cpu(struct device *dev,
- dma_addr_t dma_handle, size_t size,
- enum dma_data_direction dir)
-{
- dma_sync(dma_addr_to_virt(dma_handle), size, dir);
-}
-
-static void hexagon_sync_single_for_device(struct device *dev,
- dma_addr_t dma_handle, size_t size,
- enum dma_data_direction dir)
-{
- dma_sync(dma_addr_to_virt(dma_handle), size, dir);
-}
-
-static int hexagon_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return dma_addr == HEXAGON_MAPPING_ERROR;
-}
-
-const struct dma_map_ops hexagon_dma_ops = {
- .alloc = hexagon_dma_alloc_coherent,
- .free = hexagon_free_coherent,
- .map_sg = hexagon_map_sg,
- .map_page = hexagon_map_page,
- .sync_single_for_cpu = hexagon_sync_single_for_cpu,
- .sync_single_for_device = hexagon_sync_single_for_device,
- .mapping_error = hexagon_mapping_error,
-};
-
-void __init hexagon_dma_init(void)
-{
- if (dma_ops)
- return;
-
- dma_ops = &hexagon_dma_ops;
-}