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authorLinus Torvalds <torvalds@linux-foundation.org>2018-08-14 05:24:32 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-14 05:24:32 +0300
commite5a32b5b21a18d24e9d735891550c194b4c60bd2 (patch)
treea5c78286f8e6794a5760ab9f3f029c57ea624183 /arch/mips/mm
parent2280a5360e4ff9320bfb12f760a8e9916ff5e7bc (diff)
parent22f20a110321efb7cde3e87ae99862e1036ca285 (diff)
downloadlinux-e5a32b5b21a18d24e9d735891550c194b4c60bd2.tar.xz
Merge tag 'mips_4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux
Pull MIPS updates from Paul Burton: "Here are the main MIPS changes for 4.19. An overview of the general architecture changes: - Massive DMA ops refactoring from Christoph Hellwig (huzzah for deleting crufty code!). - We introduce NT_MIPS_DSP & NT_MIPS_FP_MODE ELF notes & corresponding regsets to expose DSP ASE & floating point mode state respectively, both for live debugging & core dumps. - We better optimize our code by hard-coding cpu_has_* macros at compile time where their values are known due to the ISA revision that the kernel build is targeting. - The EJTAG exception handler now better handles SMP systems, where it was previously possible for CPUs to clobber a register value saved by another CPU. - Our implementation of memset() gained a couple of fixes for MIPSr6 systems to return correct values in some cases where stores fault. - We now implement ioremap_wc() using the uncached-accelerated cache coherency attribute where supported, which is detected during boot, and fall back to plain uncached access where necessary. The MIPS-specific (and unused in tree) ioremap_uncached_accelerated() & ioremap_cacheable_cow() are removed. - The prctl(PR_SET_FP_MODE, ...) syscall is better supported for SMP systems by reworking the way we ensure remote CPUs that may be running threads within the affected process switch mode. - Systems using the MIPS Coherence Manager will now set the MIPS_IC_SNOOPS_REMOTE flag to avoid some unnecessary cache maintenance overhead when flushing the icache. - A few fixes were made for building with clang/LLVM, which now sucessfully builds kernels for many of our platforms. - Miscellaneous cleanups all over. And some platform-specific changes: - ar7 gained stubs for a few clock API functions to fix build failures for some drivers. - ath79 gained support for a few new SoCs, a few fixes & better gpio-keys support. - Ci20 now exposes its SPI bus using the spi-gpio driver. - The generic platform can now auto-detect a suitable value for PHYS_OFFSET based upon the memory map described by the device tree, allowing us to avoid wasting memory on page book-keeping for systems where RAM starts at a non-zero physical address. - Ingenic systems using the jz4740 platform code now link their vmlinuz higher to allow for kernels of a realistic size. - Loongson32 now builds the kernel targeting MIPSr1 rather than MIPSr2 to avoid CPU errata. - Loongson64 gains a couple of fixes, a workaround for a write buffering issue & support for the Loongson 3A R3.1 CPU. - Malta now uses the piix4-poweroff driver to handle powering down. - Microsemi Ocelot gained support for its SPI bus & NOR flash, its second MDIO bus and can now be supported by a FIT/.itb image. - Octeon saw a bunch of header cleanups which remove a lot of duplicate or unused code" * tag 'mips_4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: (123 commits) MIPS: Remove remnants of UASM_ISA MIPS: netlogic: xlr: Remove erroneous check in nlm_fmn_send() MIPS: VDSO: Force link endianness MIPS: Always specify -EB or -EL when using clang MIPS: Use dins to simplify __write_64bit_c0_split() MIPS: Use read-write output operand in __write_64bit_c0_split() MIPS: Avoid using array as parameter to write_c0_kpgd() MIPS: vdso: Allow clang's --target flag in VDSO cflags MIPS: genvdso: Remove GOT checks MIPS: Remove obsolete MIPS checks for DST node "chosen@0" MIPS: generic: Remove input symbols from defconfig MIPS: Delete unused code in linux32.c MIPS: Remove unused sys_32_mmap2 MIPS: Remove nabi_no_regargs mips: dts: mscc: enable spi and NOR flash support on ocelot PCB123 mips: dts: mscc: Add spi on Ocelot MIPS: Loongson: Merge load addresses MIPS: Loongson: Set Loongson32 to MIPS32R1 MIPS: mscc: ocelot: add interrupt controller properties to GPIO controller MIPS: generic: Select MIPS_AUTO_PFN_OFFSET ...
Diffstat (limited to 'arch/mips/mm')
-rw-r--r--arch/mips/mm/Makefile3
-rw-r--r--arch/mips/mm/c-r4k.c18
-rw-r--r--arch/mips/mm/cache.c4
-rw-r--r--arch/mips/mm/dma-default.c404
-rw-r--r--arch/mips/mm/dma-noncoherent.c208
-rw-r--r--arch/mips/mm/page.c15
-rw-r--r--arch/mips/mm/tlbex.c2
-rw-r--r--arch/mips/mm/uasm-micromips.c1
-rw-r--r--arch/mips/mm/uasm-mips.c1
9 files changed, 227 insertions, 429 deletions
diff --git a/arch/mips/mm/Makefile b/arch/mips/mm/Makefile
index c463bdad45c7..3e5bb203c95a 100644
--- a/arch/mips/mm/Makefile
+++ b/arch/mips/mm/Makefile
@@ -3,7 +3,7 @@
# Makefile for the Linux/MIPS-specific parts of the memory manager.
#
-obj-y += cache.o dma-default.o extable.o fault.o \
+obj-y += cache.o extable.o fault.o \
gup.o init.o mmap.o page.o page-funcs.o \
pgtable.o tlbex.o tlbex-fault.o tlb-funcs.o
@@ -17,6 +17,7 @@ obj-$(CONFIG_32BIT) += ioremap.o pgtable-32.o
obj-$(CONFIG_64BIT) += pgtable-64.o
obj-$(CONFIG_HIGHMEM) += highmem.o
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
+obj-$(CONFIG_DMA_NONCOHERENT) += dma-noncoherent.o
obj-$(CONFIG_CPU_R4K_CACHE_TLB) += c-r4k.o cex-gen.o tlb-r4k.o
obj-$(CONFIG_CPU_R3000) += c-r3k.o tlb-r3k.o
diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index e12dfa48b478..a9ef057c79fe 100644
--- a/arch/mips/mm/c-r4k.c
+++ b/arch/mips/mm/c-r4k.c
@@ -830,12 +830,13 @@ static void r4k_flush_icache_user_range(unsigned long start, unsigned long end)
return __r4k_flush_icache_range(start, end, true);
}
-#if defined(CONFIG_DMA_NONCOHERENT) || defined(CONFIG_DMA_MAYBE_COHERENT)
+#ifdef CONFIG_DMA_NONCOHERENT
static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
{
/* Catch bad driver code */
- BUG_ON(size == 0);
+ if (WARN_ON(size == 0))
+ return;
preempt_disable();
if (cpu_has_inclusive_pcaches) {
@@ -871,7 +872,8 @@ static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
{
/* Catch bad driver code */
- BUG_ON(size == 0);
+ if (WARN_ON(size == 0))
+ return;
preempt_disable();
if (cpu_has_inclusive_pcaches) {
@@ -904,7 +906,7 @@ static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
bc_inv(addr, size);
__sync();
}
-#endif /* CONFIG_DMA_NONCOHERENT || CONFIG_DMA_MAYBE_COHERENT */
+#endif /* CONFIG_DMA_NONCOHERENT */
struct flush_cache_sigtramp_args {
struct mm_struct *mm;
@@ -1505,6 +1507,14 @@ static void probe_pcache(void)
if (c->dcache.flags & MIPS_CACHE_PINDEX)
c->dcache.flags &= ~MIPS_CACHE_ALIASES;
+ /*
+ * In systems with CM the icache fills from L2 or closer caches, and
+ * thus sees remote stores without needing to write them back any
+ * further than that.
+ */
+ if (mips_cm_present())
+ c->icache.flags |= MIPS_IC_SNOOPS_REMOTE;
+
switch (current_cpu_type()) {
case CPU_20KC:
/*
diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c
index 0d3c656feba0..70a523151ff3 100644
--- a/arch/mips/mm/cache.c
+++ b/arch/mips/mm/cache.c
@@ -56,7 +56,7 @@ EXPORT_SYMBOL_GPL(local_flush_data_cache_page);
EXPORT_SYMBOL(flush_data_cache_page);
EXPORT_SYMBOL(flush_icache_all);
-#if defined(CONFIG_DMA_NONCOHERENT) || defined(CONFIG_DMA_MAYBE_COHERENT)
+#ifdef CONFIG_DMA_NONCOHERENT
/* DMA cache operations. */
void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
@@ -65,7 +65,7 @@ void (*_dma_cache_inv)(unsigned long start, unsigned long size);
EXPORT_SYMBOL(_dma_cache_wback_inv);
-#endif /* CONFIG_DMA_NONCOHERENT || CONFIG_DMA_MAYBE_COHERENT */
+#endif /* CONFIG_DMA_NONCOHERENT */
/*
* We could optimize the case where the cache argument is not BCACHE but
diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c
deleted file mode 100644
index f9fef0028ca2..000000000000
--- a/arch/mips/mm/dma-default.c
+++ /dev/null
@@ -1,404 +0,0 @@
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 2000 Ani Joshi <ajoshi@unixbox.com>
- * Copyright (C) 2000, 2001, 06 Ralf Baechle <ralf@linux-mips.org>
- * swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
- */
-
-#include <linux/types.h>
-#include <linux/dma-mapping.h>
-#include <linux/mm.h>
-#include <linux/export.h>
-#include <linux/scatterlist.h>
-#include <linux/string.h>
-#include <linux/gfp.h>
-#include <linux/highmem.h>
-#include <linux/dma-contiguous.h>
-
-#include <asm/cache.h>
-#include <asm/cpu-type.h>
-#include <asm/io.h>
-
-#include <dma-coherence.h>
-
-#if defined(CONFIG_DMA_MAYBE_COHERENT) && !defined(CONFIG_DMA_PERDEV_COHERENT)
-/* User defined DMA coherency from command line. */
-enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT;
-EXPORT_SYMBOL_GPL(coherentio);
-int hw_coherentio = 0; /* Actual hardware supported DMA coherency setting. */
-
-static int __init setcoherentio(char *str)
-{
- coherentio = IO_COHERENCE_ENABLED;
- pr_info("Hardware DMA cache coherency (command line)\n");
- return 0;
-}
-early_param("coherentio", setcoherentio);
-
-static int __init setnocoherentio(char *str)
-{
- coherentio = IO_COHERENCE_DISABLED;
- pr_info("Software DMA cache coherency (command line)\n");
- return 0;
-}
-early_param("nocoherentio", setnocoherentio);
-#endif
-
-static inline struct page *dma_addr_to_page(struct device *dev,
- dma_addr_t dma_addr)
-{
- return pfn_to_page(
- plat_dma_addr_to_phys(dev, dma_addr) >> PAGE_SHIFT);
-}
-
-/*
- * The affected CPUs below in 'cpu_needs_post_dma_flush()' can
- * speculatively fill random cachelines with stale data at any time,
- * requiring an extra flush post-DMA.
- *
- * Warning on the terminology - Linux calls an uncached area coherent;
- * MIPS terminology calls memory areas with hardware maintained coherency
- * coherent.
- *
- * Note that the R14000 and R16000 should also be checked for in this
- * condition. However this function is only called on non-I/O-coherent
- * systems and only the R10000 and R12000 are used in such systems, the
- * SGI IP28 Indigo² rsp. SGI IP32 aka O2.
- */
-static inline bool cpu_needs_post_dma_flush(struct device *dev)
-{
- if (plat_device_is_coherent(dev))
- return false;
-
- switch (boot_cpu_type()) {
- case CPU_R10000:
- case CPU_R12000:
- case CPU_BMIPS5000:
- return true;
-
- default:
- /*
- * Presence of MAARs suggests that the CPU supports
- * speculatively prefetching data, and therefore requires
- * the post-DMA flush/invalidate.
- */
- return cpu_has_maar;
- }
-}
-
-static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp)
-{
- gfp_t dma_flag;
-
-#ifdef CONFIG_ISA
- if (dev == NULL)
- dma_flag = __GFP_DMA;
- else
-#endif
-#if defined(CONFIG_ZONE_DMA32) && defined(CONFIG_ZONE_DMA)
- if (dev == NULL || dev->coherent_dma_mask < DMA_BIT_MASK(32))
- dma_flag = __GFP_DMA;
- else if (dev->coherent_dma_mask < DMA_BIT_MASK(64))
- dma_flag = __GFP_DMA32;
- else
-#endif
-#if defined(CONFIG_ZONE_DMA32) && !defined(CONFIG_ZONE_DMA)
- if (dev == NULL || dev->coherent_dma_mask < DMA_BIT_MASK(64))
- dma_flag = __GFP_DMA32;
- else
-#endif
-#if defined(CONFIG_ZONE_DMA) && !defined(CONFIG_ZONE_DMA32)
- if (dev == NULL ||
- dev->coherent_dma_mask < DMA_BIT_MASK(sizeof(phys_addr_t) * 8))
- dma_flag = __GFP_DMA;
- else
-#endif
- dma_flag = 0;
-
- /* Don't invoke OOM killer */
- gfp |= __GFP_NORETRY;
-
- return gfp | dma_flag;
-}
-
-static void *mips_dma_alloc_coherent(struct device *dev, size_t size,
- dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
-{
- void *ret;
- struct page *page = NULL;
- unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
-
- gfp = massage_gfp_flags(dev, gfp);
-
- if (IS_ENABLED(CONFIG_DMA_CMA) && gfpflags_allow_blocking(gfp))
- page = dma_alloc_from_contiguous(dev, count, get_order(size),
- gfp);
- if (!page)
- page = alloc_pages(gfp, get_order(size));
-
- if (!page)
- return NULL;
-
- ret = page_address(page);
- memset(ret, 0, size);
- *dma_handle = plat_map_dma_mem(dev, ret, size);
- if (!(attrs & DMA_ATTR_NON_CONSISTENT) &&
- !plat_device_is_coherent(dev)) {
- dma_cache_wback_inv((unsigned long) ret, size);
- ret = UNCAC_ADDR(ret);
- }
-
- return ret;
-}
-
-static void mips_dma_free_coherent(struct device *dev, size_t size, void *vaddr,
- dma_addr_t dma_handle, unsigned long attrs)
-{
- unsigned long addr = (unsigned long) vaddr;
- unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
- struct page *page = NULL;
-
- plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
-
- if (!(attrs & DMA_ATTR_NON_CONSISTENT) && !plat_device_is_coherent(dev))
- addr = CAC_ADDR(addr);
-
- page = virt_to_page((void *) addr);
-
- if (!dma_release_from_contiguous(dev, page, count))
- __free_pages(page, get_order(size));
-}
-
-static int mips_dma_mmap(struct device *dev, struct vm_area_struct *vma,
- void *cpu_addr, dma_addr_t dma_addr, size_t size,
- unsigned long attrs)
-{
- unsigned long user_count = vma_pages(vma);
- unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
- unsigned long addr = (unsigned long)cpu_addr;
- unsigned long off = vma->vm_pgoff;
- unsigned long pfn;
- int ret = -ENXIO;
-
- if (!plat_device_is_coherent(dev))
- addr = CAC_ADDR(addr);
-
- pfn = page_to_pfn(virt_to_page((void *)addr));
-
- if (attrs & DMA_ATTR_WRITE_COMBINE)
- vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
- else
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-
- if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret))
- return ret;
-
- if (off < count && user_count <= (count - off)) {
- ret = remap_pfn_range(vma, vma->vm_start,
- pfn + off,
- user_count << PAGE_SHIFT,
- vma->vm_page_prot);
- }
-
- return ret;
-}
-
-static inline void __dma_sync_virtual(void *addr, size_t size,
- enum dma_data_direction direction)
-{
- switch (direction) {
- case DMA_TO_DEVICE:
- dma_cache_wback((unsigned long)addr, size);
- break;
-
- case DMA_FROM_DEVICE:
- dma_cache_inv((unsigned long)addr, size);
- break;
-
- case DMA_BIDIRECTIONAL:
- dma_cache_wback_inv((unsigned long)addr, size);
- break;
-
- default:
- BUG();
- }
-}
-
-/*
- * A single sg entry may refer to multiple physically contiguous
- * pages. But we still need to process highmem pages individually.
- * If highmem is not configured then the bulk of this loop gets
- * optimized out.
- */
-static inline void __dma_sync(struct page *page,
- unsigned long offset, size_t size, enum dma_data_direction direction)
-{
- size_t left = size;
-
- do {
- size_t len = left;
-
- if (PageHighMem(page)) {
- void *addr;
-
- if (offset + len > PAGE_SIZE) {
- if (offset >= PAGE_SIZE) {
- page += offset >> PAGE_SHIFT;
- offset &= ~PAGE_MASK;
- }
- len = PAGE_SIZE - offset;
- }
-
- addr = kmap_atomic(page);
- __dma_sync_virtual(addr + offset, len, direction);
- kunmap_atomic(addr);
- } else
- __dma_sync_virtual(page_address(page) + offset,
- size, direction);
- offset = 0;
- page++;
- left -= len;
- } while (left);
-}
-
-static void mips_dma_unmap_page(struct device *dev, dma_addr_t dma_addr,
- size_t size, enum dma_data_direction direction, unsigned long attrs)
-{
- if (cpu_needs_post_dma_flush(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- __dma_sync(dma_addr_to_page(dev, dma_addr),
- dma_addr & ~PAGE_MASK, size, direction);
- plat_post_dma_flush(dev);
- plat_unmap_dma_mem(dev, dma_addr, size, direction);
-}
-
-static int mips_dma_map_sg(struct device *dev, struct scatterlist *sglist,
- int nents, enum dma_data_direction direction, unsigned long attrs)
-{
- int i;
- struct scatterlist *sg;
-
- for_each_sg(sglist, sg, nents, i) {
- if (!plat_device_is_coherent(dev) &&
- !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- __dma_sync(sg_page(sg), sg->offset, sg->length,
- direction);
-#ifdef CONFIG_NEED_SG_DMA_LENGTH
- sg->dma_length = sg->length;
-#endif
- sg->dma_address = plat_map_dma_mem_page(dev, sg_page(sg)) +
- sg->offset;
- }
-
- return nents;
-}
-
-static dma_addr_t mips_dma_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t size, enum dma_data_direction direction,
- unsigned long attrs)
-{
- if (!plat_device_is_coherent(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- __dma_sync(page, offset, size, direction);
-
- return plat_map_dma_mem_page(dev, page) + offset;
-}
-
-static void mips_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
- int nhwentries, enum dma_data_direction direction,
- unsigned long attrs)
-{
- int i;
- struct scatterlist *sg;
-
- for_each_sg(sglist, sg, nhwentries, i) {
- if (!plat_device_is_coherent(dev) &&
- !(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
- direction != DMA_TO_DEVICE)
- __dma_sync(sg_page(sg), sg->offset, sg->length,
- direction);
- plat_unmap_dma_mem(dev, sg->dma_address, sg->length, direction);
- }
-}
-
-static void mips_dma_sync_single_for_cpu(struct device *dev,
- dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
-{
- if (cpu_needs_post_dma_flush(dev))
- __dma_sync(dma_addr_to_page(dev, dma_handle),
- dma_handle & ~PAGE_MASK, size, direction);
- plat_post_dma_flush(dev);
-}
-
-static void mips_dma_sync_single_for_device(struct device *dev,
- dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
-{
- if (!plat_device_is_coherent(dev))
- __dma_sync(dma_addr_to_page(dev, dma_handle),
- dma_handle & ~PAGE_MASK, size, direction);
-}
-
-static void mips_dma_sync_sg_for_cpu(struct device *dev,
- struct scatterlist *sglist, int nelems,
- enum dma_data_direction direction)
-{
- int i;
- struct scatterlist *sg;
-
- if (cpu_needs_post_dma_flush(dev)) {
- for_each_sg(sglist, sg, nelems, i) {
- __dma_sync(sg_page(sg), sg->offset, sg->length,
- direction);
- }
- }
- plat_post_dma_flush(dev);
-}
-
-static void mips_dma_sync_sg_for_device(struct device *dev,
- struct scatterlist *sglist, int nelems,
- enum dma_data_direction direction)
-{
- int i;
- struct scatterlist *sg;
-
- if (!plat_device_is_coherent(dev)) {
- for_each_sg(sglist, sg, nelems, i) {
- __dma_sync(sg_page(sg), sg->offset, sg->length,
- direction);
- }
- }
-}
-
-static int mips_dma_supported(struct device *dev, u64 mask)
-{
- return plat_dma_supported(dev, mask);
-}
-
-static void mips_dma_cache_sync(struct device *dev, void *vaddr, size_t size,
- enum dma_data_direction direction)
-{
- BUG_ON(direction == DMA_NONE);
-
- if (!plat_device_is_coherent(dev))
- __dma_sync_virtual(vaddr, size, direction);
-}
-
-static const struct dma_map_ops mips_default_dma_map_ops = {
- .alloc = mips_dma_alloc_coherent,
- .free = mips_dma_free_coherent,
- .mmap = mips_dma_mmap,
- .map_page = mips_dma_map_page,
- .unmap_page = mips_dma_unmap_page,
- .map_sg = mips_dma_map_sg,
- .unmap_sg = mips_dma_unmap_sg,
- .sync_single_for_cpu = mips_dma_sync_single_for_cpu,
- .sync_single_for_device = mips_dma_sync_single_for_device,
- .sync_sg_for_cpu = mips_dma_sync_sg_for_cpu,
- .sync_sg_for_device = mips_dma_sync_sg_for_device,
- .dma_supported = mips_dma_supported,
- .cache_sync = mips_dma_cache_sync,
-};
-
-const struct dma_map_ops *mips_dma_map_ops = &mips_default_dma_map_ops;
-EXPORT_SYMBOL(mips_dma_map_ops);
diff --git a/arch/mips/mm/dma-noncoherent.c b/arch/mips/mm/dma-noncoherent.c
new file mode 100644
index 000000000000..2aca1236af36
--- /dev/null
+++ b/arch/mips/mm/dma-noncoherent.c
@@ -0,0 +1,208 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2000 Ani Joshi <ajoshi@unixbox.com>
+ * Copyright (C) 2000, 2001, 06 Ralf Baechle <ralf@linux-mips.org>
+ * swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
+ */
+#include <linux/dma-direct.h>
+#include <linux/dma-noncoherent.h>
+#include <linux/dma-contiguous.h>
+#include <linux/highmem.h>
+
+#include <asm/cache.h>
+#include <asm/cpu-type.h>
+#include <asm/dma-coherence.h>
+#include <asm/io.h>
+
+#ifdef CONFIG_DMA_PERDEV_COHERENT
+static inline int dev_is_coherent(struct device *dev)
+{
+ return dev->archdata.dma_coherent;
+}
+#else
+static inline int dev_is_coherent(struct device *dev)
+{
+ switch (coherentio) {
+ default:
+ case IO_COHERENCE_DEFAULT:
+ return hw_coherentio;
+ case IO_COHERENCE_ENABLED:
+ return 1;
+ case IO_COHERENCE_DISABLED:
+ return 0;
+ }
+}
+#endif /* CONFIG_DMA_PERDEV_COHERENT */
+
+/*
+ * The affected CPUs below in 'cpu_needs_post_dma_flush()' can speculatively
+ * fill random cachelines with stale data at any time, requiring an extra
+ * flush post-DMA.
+ *
+ * Warning on the terminology - Linux calls an uncached area coherent; MIPS
+ * terminology calls memory areas with hardware maintained coherency coherent.
+ *
+ * Note that the R14000 and R16000 should also be checked for in this condition.
+ * However this function is only called on non-I/O-coherent systems and only the
+ * R10000 and R12000 are used in such systems, the SGI IP28 Indigo² rsp.
+ * SGI IP32 aka O2.
+ */
+static inline bool cpu_needs_post_dma_flush(struct device *dev)
+{
+ if (dev_is_coherent(dev))
+ return false;
+
+ switch (boot_cpu_type()) {
+ case CPU_R10000:
+ case CPU_R12000:
+ case CPU_BMIPS5000:
+ return true;
+ default:
+ /*
+ * Presence of MAARs suggests that the CPU supports
+ * speculatively prefetching data, and therefore requires
+ * the post-DMA flush/invalidate.
+ */
+ return cpu_has_maar;
+ }
+}
+
+void *arch_dma_alloc(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
+{
+ void *ret;
+
+ ret = dma_direct_alloc(dev, size, dma_handle, gfp, attrs);
+ if (!ret)
+ return NULL;
+
+ if (!dev_is_coherent(dev) && !(attrs & DMA_ATTR_NON_CONSISTENT)) {
+ dma_cache_wback_inv((unsigned long) ret, size);
+ ret = (void *)UNCAC_ADDR(ret);
+ }
+
+ return ret;
+}
+
+void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
+ dma_addr_t dma_addr, unsigned long attrs)
+{
+ if (!(attrs & DMA_ATTR_NON_CONSISTENT) && !dev_is_coherent(dev))
+ cpu_addr = (void *)CAC_ADDR((unsigned long)cpu_addr);
+ dma_direct_free(dev, size, cpu_addr, dma_addr, attrs);
+}
+
+int arch_dma_mmap(struct device *dev, struct vm_area_struct *vma,
+ void *cpu_addr, dma_addr_t dma_addr, size_t size,
+ unsigned long attrs)
+{
+ unsigned long user_count = vma_pages(vma);
+ unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
+ unsigned long addr = (unsigned long)cpu_addr;
+ unsigned long off = vma->vm_pgoff;
+ unsigned long pfn;
+ int ret = -ENXIO;
+
+ if (!dev_is_coherent(dev))
+ addr = CAC_ADDR(addr);
+
+ pfn = page_to_pfn(virt_to_page((void *)addr));
+
+ if (attrs & DMA_ATTR_WRITE_COMBINE)
+ vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
+ else
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+ if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret))
+ return ret;
+
+ if (off < count && user_count <= (count - off)) {
+ ret = remap_pfn_range(vma, vma->vm_start,
+ pfn + off,
+ user_count << PAGE_SHIFT,
+ vma->vm_page_prot);
+ }
+
+ return ret;
+}
+
+static inline void dma_sync_virt(void *addr, size_t size,
+ enum dma_data_direction dir)
+{
+ switch (dir) {
+ case DMA_TO_DEVICE:
+ dma_cache_wback((unsigned long)addr, size);
+ break;
+
+ case DMA_FROM_DEVICE:
+ dma_cache_inv((unsigned long)addr, size);
+ break;
+
+ case DMA_BIDIRECTIONAL:
+ dma_cache_wback_inv((unsigned long)addr, size);
+ break;
+
+ default:
+ BUG();
+ }
+}
+
+/*
+ * A single sg entry may refer to multiple physically contiguous pages. But
+ * we still need to process highmem pages individually. If highmem is not
+ * configured then the bulk of this loop gets optimized out.
+ */
+static inline void dma_sync_phys(phys_addr_t paddr, size_t size,
+ enum dma_data_direction dir)
+{
+ struct page *page = pfn_to_page(paddr >> PAGE_SHIFT);
+ unsigned long offset = paddr & ~PAGE_MASK;
+ size_t left = size;
+
+ do {
+ size_t len = left;
+
+ if (PageHighMem(page)) {
+ void *addr;
+
+ if (offset + len > PAGE_SIZE) {
+ if (offset >= PAGE_SIZE) {
+ page += offset >> PAGE_SHIFT;
+ offset &= ~PAGE_MASK;
+ }
+ len = PAGE_SIZE - offset;
+ }
+
+ addr = kmap_atomic(page);
+ dma_sync_virt(addr + offset, len, dir);
+ kunmap_atomic(addr);
+ } else
+ dma_sync_virt(page_address(page) + offset, size, dir);
+ offset = 0;
+ page++;
+ left -= len;
+ } while (left);
+}
+
+void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
+ size_t size, enum dma_data_direction dir)
+{
+ if (!dev_is_coherent(dev))
+ dma_sync_phys(paddr, size, dir);
+}
+
+void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
+ size_t size, enum dma_data_direction dir)
+{
+ if (cpu_needs_post_dma_flush(dev))
+ dma_sync_phys(paddr, size, dir);
+}
+
+void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size,
+ enum dma_data_direction direction)
+{
+ BUG_ON(direction == DMA_NONE);
+
+ if (!dev_is_coherent(dev))
+ dma_sync_virt(vaddr, size, direction);
+}
diff --git a/arch/mips/mm/page.c b/arch/mips/mm/page.c
index d5d02993aa21..56e4f8bffd4c 100644
--- a/arch/mips/mm/page.c
+++ b/arch/mips/mm/page.c
@@ -623,21 +623,6 @@ struct dmadscr {
u64 pad_b;
} ____cacheline_aligned_in_smp page_descr[DM_NUM_CHANNELS];
-void sb1_dma_init(void)
-{
- int i;
-
- for (i = 0; i < DM_NUM_CHANNELS; i++) {
- const u64 base_val = CPHYSADDR((unsigned long)&page_descr[i]) |
- V_DM_DSCR_BASE_RINGSZ(1);
- void *base_reg = IOADDR(A_DM_REGISTER(i, R_DM_DSCR_BASE));
-
- __raw_writeq(base_val, base_reg);
- __raw_writeq(base_val | M_DM_DSCR_BASE_RESET, base_reg);
- __raw_writeq(base_val | M_DM_DSCR_BASE_ENABL, base_reg);
- }
-}
-
void clear_page(void *page)
{
u64 to_phys = CPHYSADDR((unsigned long)page);
diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c
index 79b9f2ad3ff5..49312a14cd17 100644
--- a/arch/mips/mm/tlbex.c
+++ b/arch/mips/mm/tlbex.c
@@ -1509,7 +1509,7 @@ static void setup_pw(void)
#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
write_c0_pwctl(1 << 6 | psn);
#endif
- write_c0_kpgd(swapper_pg_dir);
+ write_c0_kpgd((long)swapper_pg_dir);
kscratch_used_mask |= (1 << 7); /* KScratch6 is used for KPGD */
}
diff --git a/arch/mips/mm/uasm-micromips.c b/arch/mips/mm/uasm-micromips.c
index 9bb6baa45da3..24e5b0d06899 100644
--- a/arch/mips/mm/uasm-micromips.c
+++ b/arch/mips/mm/uasm-micromips.c
@@ -19,7 +19,6 @@
#include <asm/inst.h>
#include <asm/elf.h>
#include <asm/bugs.h>
-#define UASM_ISA _UASM_ISA_MICROMIPS
#include <asm/uasm.h>
#define RS_MASK 0x1f
diff --git a/arch/mips/mm/uasm-mips.c b/arch/mips/mm/uasm-mips.c
index 9fea6c6bbf49..60ceb93c71a0 100644
--- a/arch/mips/mm/uasm-mips.c
+++ b/arch/mips/mm/uasm-mips.c
@@ -19,7 +19,6 @@
#include <asm/inst.h>
#include <asm/elf.h>
#include <asm/bugs.h>
-#define UASM_ISA _UASM_ISA_CLASSIC
#include <asm/uasm.h>
#define RS_MASK 0x1f