| Message ID | 20190501131339.GA890@lst.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | None | expand |
Hi Christoph, On Wed, May 01, 2019 at 03:13:39PM +0200, Christoph Hellwig wrote: > Stop providing our arch alloc/free hooks and just expose the segment > offset instead. > > Signed-off-by: Christoph Hellwig <hch@lst.de> > --- > arch/mips/Kconfig | 1 + > arch/mips/include/asm/page.h | 3 --- > arch/mips/jazz/jazzdma.c | 6 ------ > arch/mips/mm/dma-noncoherent.c | 26 +++++++++----------------- > 4 files changed, 10 insertions(+), 26 deletions(-) This one looks good to me now, for patches 1 & 5: Acked-by: Paul Burton <paul.burton@mips.com> Thanks, Paul
On Wed, May 01, 2019 at 05:13:57PM +0000, Paul Burton wrote: > Hi Christoph, > > On Wed, May 01, 2019 at 03:13:39PM +0200, Christoph Hellwig wrote: > > Stop providing our arch alloc/free hooks and just expose the segment > > offset instead. > > > > Signed-off-by: Christoph Hellwig <hch@lst.de> > > --- > > arch/mips/Kconfig | 1 + > > arch/mips/include/asm/page.h | 3 --- > > arch/mips/jazz/jazzdma.c | 6 ------ > > arch/mips/mm/dma-noncoherent.c | 26 +++++++++----------------- > > 4 files changed, 10 insertions(+), 26 deletions(-) > > This one looks good to me now, for patches 1 & 5: > > Acked-by: Paul Burton <paul.burton@mips.com> Thanks, I've merged thos into the dma-mapping tree.
On Mon, Jun 3, 2019 at 8:50 AM Christoph Hellwig <hch@lst.de> wrote: > > On Wed, May 01, 2019 at 05:13:57PM +0000, Paul Burton wrote: > > Hi Christoph, > > > > On Wed, May 01, 2019 at 03:13:39PM +0200, Christoph Hellwig wrote: > > > Stop providing our arch alloc/free hooks and just expose the segment > > > offset instead. > > > > > > Signed-off-by: Christoph Hellwig <hch@lst.de> > > > --- > > > arch/mips/Kconfig | 1 + > > > arch/mips/include/asm/page.h | 3 --- > > > arch/mips/jazz/jazzdma.c | 6 ------ > > > arch/mips/mm/dma-noncoherent.c | 26 +++++++++----------------- > > > 4 files changed, 10 insertions(+), 26 deletions(-) > > > > This one looks good to me now, for patches 1 & 5: > > > > Acked-by: Paul Burton <paul.burton@mips.com> > > Thanks, I've merged thos into the dma-mapping tree. I think this is the cause of some kernelci failures in current linux-next builds: https://kernelci.org/build/next/branch/master/kernel/next-20190702/ bigsur_defconfig ‐ mips3 warnings — 1 error cavium_octeon_defconfig ‐ mips3 warnings — 1 error ip27_defconfig ‐ mips3 warnings — 1 error loongson3_defconfig ‐ mips3 warnings — 1 error mips_paravirt_defconfig ‐ mips3 warnings — 1 error nlm_xlp_defconfig ‐ mips3 warnings — 1 error nlm_xlr_defconfig ‐ mips1 warning — 1 error /home/buildslave/workspace/workspace/kernel-build@8/linux/build/../kernel/dma/direct.c:144: undefined reference to `arch_dma_prep_coherent' 2/home/buildslave/workspace/kernel-build/linux/build/../kernel/dma/direct.c:144: undefined reference to `arch_dma_prep_coherent' 2(.text+0xafc): undefined reference to `arch_dma_prep_coherent' 1direct.c:(.text+0x934): undefined reference to `arch_dma_prep_coherent' 1(.text+0xb84): undefined reference to `arch_dma_prep_coherent' I haven't looked into the details, but I suspect all machines with cache-coherent DMA are broken. Arnd
On Wed, Jul 03, 2019 at 10:54:05AM +0200, Arnd Bergmann wrote: > I think this is the cause of some kernelci failures in current > linux-next builds: Yes, Guenther reported this already and I sent a fix. I've been waiting for an ACK from the mips maintaines, but given the breakage I might as well just pull it in without an ACK.
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 4a5f5b0ee9a9..cde4b490f3c7 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -9,6 +9,7 @@ config MIPS select ARCH_HAS_ELF_RANDOMIZE select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_HAS_UBSAN_SANITIZE_ALL + select ARCH_HAS_UNCACHED_SEGMENT select ARCH_SUPPORTS_UPROBES select ARCH_USE_BUILTIN_BSWAP select ARCH_USE_CMPXCHG_LOCKREF if 64BIT diff --git a/arch/mips/include/asm/page.h b/arch/mips/include/asm/page.h index 6b31c93b5eaa..23e0f1386e04 100644 --- a/arch/mips/include/asm/page.h +++ b/arch/mips/include/asm/page.h @@ -258,9 +258,6 @@ extern int __virt_addr_valid(const volatile void *kaddr); ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \ VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) -#define UNCAC_ADDR(addr) (UNCAC_BASE + __pa(addr)) -#define CAC_ADDR(addr) ((unsigned long)__va((addr) - UNCAC_BASE)) - #include <asm-generic/memory_model.h> #include <asm-generic/getorder.h> diff --git a/arch/mips/jazz/jazzdma.c b/arch/mips/jazz/jazzdma.c index bedb5047aff3..1804dc9d8136 100644 --- a/arch/mips/jazz/jazzdma.c +++ b/arch/mips/jazz/jazzdma.c @@ -575,10 +575,6 @@ static void *jazz_dma_alloc(struct device *dev, size_t size, return NULL; } - if (!(attrs & DMA_ATTR_NON_CONSISTENT)) { - dma_cache_wback_inv((unsigned long)ret, size); - ret = (void *)UNCAC_ADDR(ret); - } return ret; } @@ -586,8 +582,6 @@ static void jazz_dma_free(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle, unsigned long attrs) { vdma_free(dma_handle); - if (!(attrs & DMA_ATTR_NON_CONSISTENT)) - vaddr = (void *)CAC_ADDR((unsigned long)vaddr); dma_direct_free_pages(dev, size, vaddr, dma_handle, attrs); } diff --git a/arch/mips/mm/dma-noncoherent.c b/arch/mips/mm/dma-noncoherent.c index f9549d2fbea3..ed56c6fa7be2 100644 --- a/arch/mips/mm/dma-noncoherent.c +++ b/arch/mips/mm/dma-noncoherent.c @@ -44,33 +44,25 @@ static inline bool cpu_needs_post_dma_flush(struct device *dev) } } -void *arch_dma_alloc(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) +void arch_dma_prep_coherent(struct page *page, size_t size) { - void *ret; - - ret = dma_direct_alloc_pages(dev, size, dma_handle, gfp, attrs); - if (ret && !(attrs & DMA_ATTR_NON_CONSISTENT)) { - dma_cache_wback_inv((unsigned long) ret, size); - ret = (void *)UNCAC_ADDR(ret); - } + dma_cache_wback_inv((unsigned long)page_address(page), size); +} - return ret; +void *uncached_kernel_address(void *addr) +{ + return (void *)(__pa(addr) + UNCAC_BASE); } -void arch_dma_free(struct device *dev, size_t size, void *cpu_addr, - dma_addr_t dma_addr, unsigned long attrs) +void *cached_kernel_address(void *addr) { - if (!(attrs & DMA_ATTR_NON_CONSISTENT)) - cpu_addr = (void *)CAC_ADDR((unsigned long)cpu_addr); - dma_direct_free_pages(dev, size, cpu_addr, dma_addr, attrs); + return __va(addr) - UNCAC_BASE; } long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr, dma_addr_t dma_addr) { - unsigned long addr = CAC_ADDR((unsigned long)cpu_addr); - return page_to_pfn(virt_to_page((void *)addr)); + return page_to_pfn(virt_to_page(cached_kernel_address(cpu_addr))); } pgprot_t arch_dma_mmap_pgprot(struct device *dev, pgprot_t prot,
Stop providing our arch alloc/free hooks and just expose the segment offset instead. Signed-off-by: Christoph Hellwig <hch@lst.de> --- arch/mips/Kconfig | 1 + arch/mips/include/asm/page.h | 3 --- arch/mips/jazz/jazzdma.c | 6 ------ arch/mips/mm/dma-noncoherent.c | 26 +++++++++----------------- 4 files changed, 10 insertions(+), 26 deletions(-)