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author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2017-07-24 16:51:18 -0700 |
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committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2017-07-24 16:51:18 -0700 |
commit | 53a7ff8fb785839b87f950fd85433d9c662fac89 (patch) | |
tree | 119840a23e5226d3f258e2309b4ef1d328535dd2 /arch/mips/mm/dma-default.c | |
parent | 4323418d62fefe48ee5019f2c744c918be06ec69 (diff) | |
parent | 072a7852338af900c302490474939e089f4bd4c4 (diff) |
Merge branch 'bind_unbind' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core into next
This brings in devm_device_add_group() and friends so that we can create
driver-specific device attributes as managed resources.
Diffstat (limited to 'arch/mips/mm/dma-default.c')
-rw-r--r-- | arch/mips/mm/dma-default.c | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c index fe8df14b6169..e08598c70b3e 100644 --- a/arch/mips/mm/dma-default.c +++ b/arch/mips/mm/dma-default.c @@ -68,12 +68,25 @@ static inline struct page *dma_addr_to_page(struct device *dev, * systems and only the R10000 and R12000 are used in such systems, the * SGI IP28 Indigo² rsp. SGI IP32 aka O2. */ -static inline int cpu_needs_post_dma_flush(struct device *dev) +static inline bool cpu_needs_post_dma_flush(struct device *dev) { - return !plat_device_is_coherent(dev) && - (boot_cpu_type() == CPU_R10000 || - boot_cpu_type() == CPU_R12000 || - boot_cpu_type() == CPU_BMIPS5000); + 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) |