![Tejun Heo](/assets/img/avatar_default.png)
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
378 lines
8.6 KiB
C
378 lines
8.6 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2000 Ani Joshi <ajoshi@unixbox.com>
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* Copyright (C) 2000, 2001, 06 Ralf Baechle <ralf@linux-mips.org>
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* swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
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*/
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#include <linux/types.h>
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#include <linux/dma-mapping.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/scatterlist.h>
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#include <linux/string.h>
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#include <linux/gfp.h>
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#include <asm/cache.h>
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#include <asm/io.h>
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#include <dma-coherence.h>
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static inline unsigned long dma_addr_to_virt(struct device *dev,
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dma_addr_t dma_addr)
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{
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unsigned long addr = plat_dma_addr_to_phys(dev, dma_addr);
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return (unsigned long)phys_to_virt(addr);
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}
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/*
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* Warning on the terminology - Linux calls an uncached area coherent;
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* MIPS terminology calls memory areas with hardware maintained coherency
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* coherent.
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*/
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static inline int cpu_is_noncoherent_r10000(struct device *dev)
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{
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return !plat_device_is_coherent(dev) &&
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(current_cpu_type() == CPU_R10000 ||
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current_cpu_type() == CPU_R12000);
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}
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static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp)
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{
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/* ignore region specifiers */
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gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
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#ifdef CONFIG_ZONE_DMA
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if (dev == NULL)
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gfp |= __GFP_DMA;
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else if (dev->coherent_dma_mask < DMA_BIT_MASK(24))
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gfp |= __GFP_DMA;
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else
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#endif
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#ifdef CONFIG_ZONE_DMA32
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if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
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gfp |= __GFP_DMA32;
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else
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#endif
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;
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/* Don't invoke OOM killer */
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gfp |= __GFP_NORETRY;
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return gfp;
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}
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void *dma_alloc_noncoherent(struct device *dev, size_t size,
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dma_addr_t * dma_handle, gfp_t gfp)
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{
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void *ret;
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gfp = massage_gfp_flags(dev, gfp);
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ret = (void *) __get_free_pages(gfp, get_order(size));
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if (ret != NULL) {
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memset(ret, 0, size);
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*dma_handle = plat_map_dma_mem(dev, ret, size);
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}
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return ret;
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}
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EXPORT_SYMBOL(dma_alloc_noncoherent);
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void *dma_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t * dma_handle, gfp_t gfp)
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{
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void *ret;
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if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
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return ret;
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gfp = massage_gfp_flags(dev, gfp);
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ret = (void *) __get_free_pages(gfp, get_order(size));
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if (ret) {
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memset(ret, 0, size);
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*dma_handle = plat_map_dma_mem(dev, ret, size);
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if (!plat_device_is_coherent(dev)) {
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dma_cache_wback_inv((unsigned long) ret, size);
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ret = UNCAC_ADDR(ret);
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}
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}
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return ret;
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}
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EXPORT_SYMBOL(dma_alloc_coherent);
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void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
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dma_addr_t dma_handle)
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{
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plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
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free_pages((unsigned long) vaddr, get_order(size));
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}
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EXPORT_SYMBOL(dma_free_noncoherent);
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void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
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dma_addr_t dma_handle)
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{
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unsigned long addr = (unsigned long) vaddr;
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int order = get_order(size);
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if (dma_release_from_coherent(dev, order, vaddr))
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return;
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plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
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if (!plat_device_is_coherent(dev))
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addr = CAC_ADDR(addr);
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free_pages(addr, get_order(size));
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}
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EXPORT_SYMBOL(dma_free_coherent);
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static inline void __dma_sync(unsigned long addr, size_t size,
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enum dma_data_direction direction)
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{
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switch (direction) {
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case DMA_TO_DEVICE:
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dma_cache_wback(addr, size);
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break;
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case DMA_FROM_DEVICE:
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dma_cache_inv(addr, size);
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break;
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case DMA_BIDIRECTIONAL:
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dma_cache_wback_inv(addr, size);
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break;
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default:
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BUG();
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}
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}
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dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
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enum dma_data_direction direction)
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{
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unsigned long addr = (unsigned long) ptr;
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if (!plat_device_is_coherent(dev))
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__dma_sync(addr, size, direction);
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return plat_map_dma_mem(dev, ptr, size);
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}
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EXPORT_SYMBOL(dma_map_single);
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void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
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enum dma_data_direction direction)
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{
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if (cpu_is_noncoherent_r10000(dev))
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__dma_sync(dma_addr_to_virt(dev, dma_addr), size,
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direction);
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plat_unmap_dma_mem(dev, dma_addr, size, direction);
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}
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EXPORT_SYMBOL(dma_unmap_single);
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int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction direction)
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{
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int i;
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BUG_ON(direction == DMA_NONE);
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for (i = 0; i < nents; i++, sg++) {
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unsigned long addr;
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addr = (unsigned long) sg_virt(sg);
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if (!plat_device_is_coherent(dev) && addr)
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__dma_sync(addr, sg->length, direction);
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sg->dma_address = plat_map_dma_mem(dev,
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(void *)addr, sg->length);
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}
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return nents;
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}
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EXPORT_SYMBOL(dma_map_sg);
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dma_addr_t dma_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size, enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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if (!plat_device_is_coherent(dev)) {
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unsigned long addr;
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addr = (unsigned long) page_address(page) + offset;
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__dma_sync(addr, size, direction);
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}
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return plat_map_dma_mem_page(dev, page) + offset;
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}
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EXPORT_SYMBOL(dma_map_page);
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void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
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enum dma_data_direction direction)
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{
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unsigned long addr;
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int i;
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BUG_ON(direction == DMA_NONE);
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for (i = 0; i < nhwentries; i++, sg++) {
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if (!plat_device_is_coherent(dev) &&
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direction != DMA_TO_DEVICE) {
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addr = (unsigned long) sg_virt(sg);
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if (addr)
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__dma_sync(addr, sg->length, direction);
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}
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plat_unmap_dma_mem(dev, sg->dma_address, sg->length, direction);
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}
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}
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EXPORT_SYMBOL(dma_unmap_sg);
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void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
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size_t size, enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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if (cpu_is_noncoherent_r10000(dev)) {
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unsigned long addr;
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addr = dma_addr_to_virt(dev, dma_handle);
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__dma_sync(addr, size, direction);
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}
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}
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EXPORT_SYMBOL(dma_sync_single_for_cpu);
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void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
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size_t size, enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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plat_extra_sync_for_device(dev);
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if (!plat_device_is_coherent(dev)) {
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unsigned long addr;
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addr = dma_addr_to_virt(dev, dma_handle);
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__dma_sync(addr, size, direction);
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}
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}
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EXPORT_SYMBOL(dma_sync_single_for_device);
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void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
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unsigned long offset, size_t size, enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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if (cpu_is_noncoherent_r10000(dev)) {
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unsigned long addr;
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addr = dma_addr_to_virt(dev, dma_handle);
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__dma_sync(addr + offset, size, direction);
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}
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}
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EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
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void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
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unsigned long offset, size_t size, enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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plat_extra_sync_for_device(dev);
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if (!plat_device_is_coherent(dev)) {
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unsigned long addr;
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addr = dma_addr_to_virt(dev, dma_handle);
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__dma_sync(addr + offset, size, direction);
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}
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}
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EXPORT_SYMBOL(dma_sync_single_range_for_device);
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void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
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enum dma_data_direction direction)
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{
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int i;
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BUG_ON(direction == DMA_NONE);
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/* Make sure that gcc doesn't leave the empty loop body. */
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for (i = 0; i < nelems; i++, sg++) {
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if (cpu_is_noncoherent_r10000(dev))
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__dma_sync((unsigned long)page_address(sg_page(sg)),
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sg->length, direction);
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}
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}
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EXPORT_SYMBOL(dma_sync_sg_for_cpu);
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void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
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enum dma_data_direction direction)
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{
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int i;
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BUG_ON(direction == DMA_NONE);
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/* Make sure that gcc doesn't leave the empty loop body. */
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for (i = 0; i < nelems; i++, sg++) {
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if (!plat_device_is_coherent(dev))
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__dma_sync((unsigned long)page_address(sg_page(sg)),
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sg->length, direction);
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}
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}
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EXPORT_SYMBOL(dma_sync_sg_for_device);
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int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
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{
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return plat_dma_mapping_error(dev, dma_addr);
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}
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EXPORT_SYMBOL(dma_mapping_error);
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int dma_supported(struct device *dev, u64 mask)
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{
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return plat_dma_supported(dev, mask);
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}
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EXPORT_SYMBOL(dma_supported);
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int dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
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{
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return plat_device_is_coherent(dev);
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}
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EXPORT_SYMBOL(dma_is_consistent);
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void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
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enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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plat_extra_sync_for_device(dev);
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if (!plat_device_is_coherent(dev))
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__dma_sync((unsigned long)vaddr, size, direction);
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}
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EXPORT_SYMBOL(dma_cache_sync);
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