| Message ID | 20200910054038.324517-2-hch@lst.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/3] ARM/dma-mapping: move various helpers from dma-mapping.h to dma-direct.h | expand |
On 2020-09-10 06:40, Christoph Hellwig wrote: > Move the helpers to translate to and from direct mapping DMA addresses > to dma-direct.h. This not only is the most logical place, but the new > placement also avoids dependency loops with pending commits. For the straightforward move as it should be, Reviewed-by: Robin Murphy <robin.murphy@arm.com> However I do wonder how much of this could be cleaned up further... > Signed-off-by: Christoph Hellwig <hch@lst.de> > --- > arch/arm/common/dmabounce.c | 2 +- > arch/arm/include/asm/dma-direct.h | 70 ++++++++++++++++++++++++++++++ > arch/arm/include/asm/dma-mapping.h | 70 ------------------------------ > 3 files changed, 71 insertions(+), 71 deletions(-) > > diff --git a/arch/arm/common/dmabounce.c b/arch/arm/common/dmabounce.c > index f4b719bde76367..d3e00ea9208834 100644 > --- a/arch/arm/common/dmabounce.c > +++ b/arch/arm/common/dmabounce.c > @@ -24,7 +24,7 @@ > #include <linux/slab.h> > #include <linux/page-flags.h> > #include <linux/device.h> > -#include <linux/dma-mapping.h> > +#include <linux/dma-direct.h> > #include <linux/dmapool.h> > #include <linux/list.h> > #include <linux/scatterlist.h> > diff --git a/arch/arm/include/asm/dma-direct.h b/arch/arm/include/asm/dma-direct.h > index 7c3001a6a775bf..de0f4ff9279615 100644 > --- a/arch/arm/include/asm/dma-direct.h > +++ b/arch/arm/include/asm/dma-direct.h > @@ -2,6 +2,76 @@ > #ifndef ASM_ARM_DMA_DIRECT_H > #define ASM_ARM_DMA_DIRECT_H 1 > > +#include <asm/memory.h> > + > +#ifdef __arch_page_to_dma > +#error Please update to __arch_pfn_to_dma > +#endif This must be long, long dead by now. > + > +/* > + * dma_to_pfn/pfn_to_dma/dma_to_virt/virt_to_dma are architecture private > + * functions used internally by the DMA-mapping API to provide DMA > + * addresses. They must not be used by drivers. > + */ > +#ifndef __arch_pfn_to_dma > +static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn) > +{ > + if (dev) > + pfn -= dev->dma_pfn_offset; > + return (dma_addr_t)__pfn_to_bus(pfn); > +} > + > +static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr) > +{ > + unsigned long pfn = __bus_to_pfn(addr); > + > + if (dev) > + pfn += dev->dma_pfn_offset; > + > + return pfn; > +} These are only overridden for OMAP1510, and it looks like it wouldn't take much for the platform code or ohci-omap driver to set up a generic DMA offset for the relevant device. > + > +static inline void *dma_to_virt(struct device *dev, dma_addr_t addr) > +{ > + if (dev) { > + unsigned long pfn = dma_to_pfn(dev, addr); > + > + return phys_to_virt(__pfn_to_phys(pfn)); > + } > + > + return (void *)__bus_to_virt((unsigned long)addr); > +} This appears entirely unused. > + > +static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) > +{ > + if (dev) > + return pfn_to_dma(dev, virt_to_pfn(addr)); > + > + return (dma_addr_t)__virt_to_bus((unsigned long)(addr)); > +} And this is only used for some debug prints in dmabounce. Similarly the __bus_to_*()/__*_to_bus() calls themselves only appear significant to mach-footbridge any more, and could probably also be evolved into regular DMA offsets now that all API calls must have a non-NULL device. I think I might come back and take a closer look at all this at some point in future... :) Robin. > + > +#else > +static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn) > +{ > + return __arch_pfn_to_dma(dev, pfn); > +} > + > +static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr) > +{ > + return __arch_dma_to_pfn(dev, addr); > +} > + > +static inline void *dma_to_virt(struct device *dev, dma_addr_t addr) > +{ > + return __arch_dma_to_virt(dev, addr); > +} > + > +static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) > +{ > + return __arch_virt_to_dma(dev, addr); > +} > +#endif > + > static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr) > { > unsigned int offset = paddr & ~PAGE_MASK; > diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h > index bdd80ddbca3451..0a1a536368c3a4 100644 > --- a/arch/arm/include/asm/dma-mapping.h > +++ b/arch/arm/include/asm/dma-mapping.h > @@ -8,8 +8,6 @@ > #include <linux/scatterlist.h> > #include <linux/dma-debug.h> > > -#include <asm/memory.h> > - > #include <xen/xen.h> > #include <asm/xen/hypervisor.h> > > @@ -23,74 +21,6 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus) > return NULL; > } > > -#ifdef __arch_page_to_dma > -#error Please update to __arch_pfn_to_dma > -#endif > - > -/* > - * dma_to_pfn/pfn_to_dma/dma_to_virt/virt_to_dma are architecture private > - * functions used internally by the DMA-mapping API to provide DMA > - * addresses. They must not be used by drivers. > - */ > -#ifndef __arch_pfn_to_dma > -static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn) > -{ > - if (dev) > - pfn -= dev->dma_pfn_offset; > - return (dma_addr_t)__pfn_to_bus(pfn); > -} > - > -static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr) > -{ > - unsigned long pfn = __bus_to_pfn(addr); > - > - if (dev) > - pfn += dev->dma_pfn_offset; > - > - return pfn; > -} > - > -static inline void *dma_to_virt(struct device *dev, dma_addr_t addr) > -{ > - if (dev) { > - unsigned long pfn = dma_to_pfn(dev, addr); > - > - return phys_to_virt(__pfn_to_phys(pfn)); > - } > - > - return (void *)__bus_to_virt((unsigned long)addr); > -} > - > -static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) > -{ > - if (dev) > - return pfn_to_dma(dev, virt_to_pfn(addr)); > - > - return (dma_addr_t)__virt_to_bus((unsigned long)(addr)); > -} > - > -#else > -static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn) > -{ > - return __arch_pfn_to_dma(dev, pfn); > -} > - > -static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr) > -{ > - return __arch_dma_to_pfn(dev, addr); > -} > - > -static inline void *dma_to_virt(struct device *dev, dma_addr_t addr) > -{ > - return __arch_dma_to_virt(dev, addr); > -} > - > -static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) > -{ > - return __arch_virt_to_dma(dev, addr); > -} > -#endif > - > /** > * arm_dma_alloc - allocate consistent memory for DMA > * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices >
On Thu, Sep 10, 2020 at 07:02:23PM +0100, Robin Murphy wrote: > On 2020-09-10 06:40, Christoph Hellwig wrote: >> Move the helpers to translate to and from direct mapping DMA addresses >> to dma-direct.h. This not only is the most logical place, but the new >> placement also avoids dependency loops with pending commits. > > For the straightforward move as it should be, > > Reviewed-by: Robin Murphy <robin.murphy@arm.com> > > However I do wonder how much of this could be cleaned up further... >> + >> +#ifdef __arch_page_to_dma >> +#error Please update to __arch_pfn_to_dma >> +#endif > > This must be long, long dead by now. Yeah. I had a patch to remove this which lead me into the rabbit hole your described later. A few patches in I decided to give up and just do the trivial move. But it probably makes sense to pick up at least the two trivial dead code removal patches.. >> +static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr) >> +{ >> + unsigned long pfn = __bus_to_pfn(addr); >> + >> + if (dev) >> + pfn += dev->dma_pfn_offset; >> + >> + return pfn; >> +} > > These are only overridden for OMAP1510, and it looks like it wouldn't take > much for the platform code or ohci-omap driver to set up a generic DMA > offset for the relevant device. I sent a ping to the omap maintainers earlier this week to ask for that :) >> +static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) >> +{ >> + if (dev) >> + return pfn_to_dma(dev, virt_to_pfn(addr)); >> + >> + return (dma_addr_t)__virt_to_bus((unsigned long)(addr)); >> +} > > And this is only used for some debug prints in dmabounce. > > Similarly the __bus_to_*()/__*_to_bus() calls themselves only appear > significant to mach-footbridge any more, and could probably also be evolved > into regular DMA offsets now that all API calls must have a non-NULL > device. I think I might come back and take a closer look at all this at > some point in future... :) Yes, pretty much all of this should eventually go away. I just don't want to bock the ranges work on all kinds of random arm cleanups..
diff --git a/arch/arm/common/dmabounce.c b/arch/arm/common/dmabounce.c index f4b719bde76367..d3e00ea9208834 100644 --- a/arch/arm/common/dmabounce.c +++ b/arch/arm/common/dmabounce.c @@ -24,7 +24,7 @@ #include <linux/slab.h> #include <linux/page-flags.h> #include <linux/device.h> -#include <linux/dma-mapping.h> +#include <linux/dma-direct.h> #include <linux/dmapool.h> #include <linux/list.h> #include <linux/scatterlist.h> diff --git a/arch/arm/include/asm/dma-direct.h b/arch/arm/include/asm/dma-direct.h index 7c3001a6a775bf..de0f4ff9279615 100644 --- a/arch/arm/include/asm/dma-direct.h +++ b/arch/arm/include/asm/dma-direct.h @@ -2,6 +2,76 @@ #ifndef ASM_ARM_DMA_DIRECT_H #define ASM_ARM_DMA_DIRECT_H 1 +#include <asm/memory.h> + +#ifdef __arch_page_to_dma +#error Please update to __arch_pfn_to_dma +#endif + +/* + * dma_to_pfn/pfn_to_dma/dma_to_virt/virt_to_dma are architecture private + * functions used internally by the DMA-mapping API to provide DMA + * addresses. They must not be used by drivers. + */ +#ifndef __arch_pfn_to_dma +static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn) +{ + if (dev) + pfn -= dev->dma_pfn_offset; + return (dma_addr_t)__pfn_to_bus(pfn); +} + +static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr) +{ + unsigned long pfn = __bus_to_pfn(addr); + + if (dev) + pfn += dev->dma_pfn_offset; + + return pfn; +} + +static inline void *dma_to_virt(struct device *dev, dma_addr_t addr) +{ + if (dev) { + unsigned long pfn = dma_to_pfn(dev, addr); + + return phys_to_virt(__pfn_to_phys(pfn)); + } + + return (void *)__bus_to_virt((unsigned long)addr); +} + +static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) +{ + if (dev) + return pfn_to_dma(dev, virt_to_pfn(addr)); + + return (dma_addr_t)__virt_to_bus((unsigned long)(addr)); +} + +#else +static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn) +{ + return __arch_pfn_to_dma(dev, pfn); +} + +static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr) +{ + return __arch_dma_to_pfn(dev, addr); +} + +static inline void *dma_to_virt(struct device *dev, dma_addr_t addr) +{ + return __arch_dma_to_virt(dev, addr); +} + +static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) +{ + return __arch_virt_to_dma(dev, addr); +} +#endif + static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr) { unsigned int offset = paddr & ~PAGE_MASK; diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h index bdd80ddbca3451..0a1a536368c3a4 100644 --- a/arch/arm/include/asm/dma-mapping.h +++ b/arch/arm/include/asm/dma-mapping.h @@ -8,8 +8,6 @@ #include <linux/scatterlist.h> #include <linux/dma-debug.h> -#include <asm/memory.h> - #include <xen/xen.h> #include <asm/xen/hypervisor.h> @@ -23,74 +21,6 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus) return NULL; } -#ifdef __arch_page_to_dma -#error Please update to __arch_pfn_to_dma -#endif - -/* - * dma_to_pfn/pfn_to_dma/dma_to_virt/virt_to_dma are architecture private - * functions used internally by the DMA-mapping API to provide DMA - * addresses. They must not be used by drivers. - */ -#ifndef __arch_pfn_to_dma -static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn) -{ - if (dev) - pfn -= dev->dma_pfn_offset; - return (dma_addr_t)__pfn_to_bus(pfn); -} - -static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr) -{ - unsigned long pfn = __bus_to_pfn(addr); - - if (dev) - pfn += dev->dma_pfn_offset; - - return pfn; -} - -static inline void *dma_to_virt(struct device *dev, dma_addr_t addr) -{ - if (dev) { - unsigned long pfn = dma_to_pfn(dev, addr); - - return phys_to_virt(__pfn_to_phys(pfn)); - } - - return (void *)__bus_to_virt((unsigned long)addr); -} - -static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) -{ - if (dev) - return pfn_to_dma(dev, virt_to_pfn(addr)); - - return (dma_addr_t)__virt_to_bus((unsigned long)(addr)); -} - -#else -static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn) -{ - return __arch_pfn_to_dma(dev, pfn); -} - -static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr) -{ - return __arch_dma_to_pfn(dev, addr); -} - -static inline void *dma_to_virt(struct device *dev, dma_addr_t addr) -{ - return __arch_dma_to_virt(dev, addr); -} - -static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) -{ - return __arch_virt_to_dma(dev, addr); -} -#endif - /** * arm_dma_alloc - allocate consistent memory for DMA * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
Move the helpers to translate to and from direct mapping DMA addresses to dma-direct.h. This not only is the most logical place, but the new placement also avoids dependency loops with pending commits. Signed-off-by: Christoph Hellwig <hch@lst.de> --- arch/arm/common/dmabounce.c | 2 +- arch/arm/include/asm/dma-direct.h | 70 ++++++++++++++++++++++++++++++ arch/arm/include/asm/dma-mapping.h | 70 ------------------------------ 3 files changed, 71 insertions(+), 71 deletions(-)