arch/*/: remove CONFIG_VIRT_TO_BUS
All architecture-independent users of virt_to_bus() and bus_to_virt() have been fixed to use the dma mapping interfaces or have been removed now. This means the definitions on most architectures, and the CONFIG_VIRT_TO_BUS symbol are now obsolete and can be removed. The only exceptions to this are a few network and scsi drivers for m68k Amiga and VME machines and ppc32 Macintosh. These drivers work correctly with the old interfaces and are probably not worth changing. On alpha and parisc, virt_to_bus() were still used in asm/floppy.h. alpha can use isa_virt_to_bus() like x86 does, and parisc can just open-code the virt_to_phys() here, as this is architecture specific code. I tried updating the bus-virt-phys-mapping.rst documentation, which started as an email from Linus to explain some details of the Linux-2.0 driver interfaces. The bits about virt_to_bus() were declared obsolete backin 2000, and the rest is not all that relevant any more, so in the end I just decided to remove the file completely. Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Acked-by: Helge Deller <deller@gmx.de> # parisc Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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Arnd Bergmann
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@ -1,220 +0,0 @@
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==========================================================
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How to access I/O mapped memory from within device drivers
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==========================================================
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:Author: Linus
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.. warning::
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The virt_to_bus() and bus_to_virt() functions have been
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superseded by the functionality provided by the PCI DMA interface
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(see Documentation/core-api/dma-api-howto.rst). They continue
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to be documented below for historical purposes, but new code
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must not use them. --davidm 00/12/12
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::
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[ This is a mail message in response to a query on IO mapping, thus the
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strange format for a "document" ]
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The AHA-1542 is a bus-master device, and your patch makes the driver give the
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controller the physical address of the buffers, which is correct on x86
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(because all bus master devices see the physical memory mappings directly).
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However, on many setups, there are actually **three** different ways of looking
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at memory addresses, and in this case we actually want the third, the
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so-called "bus address".
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Essentially, the three ways of addressing memory are (this is "real memory",
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that is, normal RAM--see later about other details):
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- CPU untranslated. This is the "physical" address. Physical address
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0 is what the CPU sees when it drives zeroes on the memory bus.
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- CPU translated address. This is the "virtual" address, and is
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completely internal to the CPU itself with the CPU doing the appropriate
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translations into "CPU untranslated".
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- bus address. This is the address of memory as seen by OTHER devices,
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not the CPU. Now, in theory there could be many different bus
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addresses, with each device seeing memory in some device-specific way, but
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happily most hardware designers aren't actually actively trying to make
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things any more complex than necessary, so you can assume that all
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external hardware sees the memory the same way.
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Now, on normal PCs the bus address is exactly the same as the physical
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address, and things are very simple indeed. However, they are that simple
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because the memory and the devices share the same address space, and that is
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not generally necessarily true on other PCI/ISA setups.
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Now, just as an example, on the PReP (PowerPC Reference Platform), the
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CPU sees a memory map something like this (this is from memory)::
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0-2 GB "real memory"
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2 GB-3 GB "system IO" (inb/out and similar accesses on x86)
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3 GB-4 GB "IO memory" (shared memory over the IO bus)
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Now, that looks simple enough. However, when you look at the same thing from
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the viewpoint of the devices, you have the reverse, and the physical memory
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address 0 actually shows up as address 2 GB for any IO master.
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So when the CPU wants any bus master to write to physical memory 0, it
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has to give the master address 0x80000000 as the memory address.
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So, for example, depending on how the kernel is actually mapped on the
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PPC, you can end up with a setup like this::
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physical address: 0
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virtual address: 0xC0000000
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bus address: 0x80000000
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where all the addresses actually point to the same thing. It's just seen
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through different translations..
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Similarly, on the Alpha, the normal translation is::
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physical address: 0
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virtual address: 0xfffffc0000000000
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bus address: 0x40000000
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(but there are also Alphas where the physical address and the bus address
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are the same).
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Anyway, the way to look up all these translations, you do::
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#include <asm/io.h>
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phys_addr = virt_to_phys(virt_addr);
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virt_addr = phys_to_virt(phys_addr);
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bus_addr = virt_to_bus(virt_addr);
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virt_addr = bus_to_virt(bus_addr);
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Now, when do you need these?
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You want the **virtual** address when you are actually going to access that
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pointer from the kernel. So you can have something like this::
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/*
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* this is the hardware "mailbox" we use to communicate with
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* the controller. The controller sees this directly.
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*/
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struct mailbox {
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__u32 status;
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__u32 bufstart;
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__u32 buflen;
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..
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} mbox;
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unsigned char * retbuffer;
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/* get the address from the controller */
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retbuffer = bus_to_virt(mbox.bufstart);
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switch (retbuffer[0]) {
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case STATUS_OK:
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...
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on the other hand, you want the bus address when you have a buffer that
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you want to give to the controller::
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/* ask the controller to read the sense status into "sense_buffer" */
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mbox.bufstart = virt_to_bus(&sense_buffer);
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mbox.buflen = sizeof(sense_buffer);
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mbox.status = 0;
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notify_controller(&mbox);
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And you generally **never** want to use the physical address, because you can't
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use that from the CPU (the CPU only uses translated virtual addresses), and
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you can't use it from the bus master.
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So why do we care about the physical address at all? We do need the physical
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address in some cases, it's just not very often in normal code. The physical
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address is needed if you use memory mappings, for example, because the
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"remap_pfn_range()" mm function wants the physical address of the memory to
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be remapped as measured in units of pages, a.k.a. the pfn (the memory
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management layer doesn't know about devices outside the CPU, so it
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shouldn't need to know about "bus addresses" etc).
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.. note::
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The above is only one part of the whole equation. The above
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only talks about "real memory", that is, CPU memory (RAM).
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There is a completely different type of memory too, and that's the "shared
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memory" on the PCI or ISA bus. That's generally not RAM (although in the case
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of a video graphics card it can be normal DRAM that is just used for a frame
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buffer), but can be things like a packet buffer in a network card etc.
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This memory is called "PCI memory" or "shared memory" or "IO memory" or
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whatever, and there is only one way to access it: the readb/writeb and
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related functions. You should never take the address of such memory, because
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there is really nothing you can do with such an address: it's not
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conceptually in the same memory space as "real memory" at all, so you cannot
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just dereference a pointer. (Sadly, on x86 it **is** in the same memory space,
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so on x86 it actually works to just deference a pointer, but it's not
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portable).
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For such memory, you can do things like:
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- reading::
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/*
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* read first 32 bits from ISA memory at 0xC0000, aka
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* C000:0000 in DOS terms
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*/
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unsigned int signature = isa_readl(0xC0000);
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- remapping and writing::
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/*
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* remap framebuffer PCI memory area at 0xFC000000,
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* size 1MB, so that we can access it: We can directly
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* access only the 640k-1MB area, so anything else
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* has to be remapped.
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*/
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void __iomem *baseptr = ioremap(0xFC000000, 1024*1024);
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/* write a 'A' to the offset 10 of the area */
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writeb('A',baseptr+10);
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/* unmap when we unload the driver */
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iounmap(baseptr);
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- copying and clearing::
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/* get the 6-byte Ethernet address at ISA address E000:0040 */
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memcpy_fromio(kernel_buffer, 0xE0040, 6);
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/* write a packet to the driver */
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memcpy_toio(0xE1000, skb->data, skb->len);
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/* clear the frame buffer */
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memset_io(0xA0000, 0, 0x10000);
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OK, that just about covers the basics of accessing IO portably. Questions?
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Comments? You may think that all the above is overly complex, but one day you
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might find yourself with a 500 MHz Alpha in front of you, and then you'll be
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happy that your driver works ;)
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Note that kernel versions 2.0.x (and earlier) mistakenly called the
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ioremap() function "vremap()". ioremap() is the proper name, but I
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didn't think straight when I wrote it originally. People who have to
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support both can do something like::
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/* support old naming silliness */
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#if LINUX_VERSION_CODE < 0x020100
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#define ioremap vremap
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#define iounmap vfree
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#endif
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at the top of their source files, and then they can use the right names
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even on 2.0.x systems.
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And the above sounds worse than it really is. Most real drivers really
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don't do all that complex things (or rather: the complexity is not so
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much in the actual IO accesses as in error handling and timeouts etc).
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It's generally not hard to fix drivers, and in many cases the code
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actually looks better afterwards::
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unsigned long signature = *(unsigned int *) 0xC0000;
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vs
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unsigned long signature = readl(0xC0000);
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I think the second version actually is more readable, no?
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@ -707,20 +707,6 @@ to use the dma_sync_*() interfaces::
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}
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}
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Drivers converted fully to this interface should not use virt_to_bus() any
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longer, nor should they use bus_to_virt(). Some drivers have to be changed a
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little bit, because there is no longer an equivalent to bus_to_virt() in the
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dynamic DMA mapping scheme - you have to always store the DMA addresses
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returned by the dma_alloc_coherent(), dma_pool_alloc(), and dma_map_single()
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calls (dma_map_sg() stores them in the scatterlist itself if the platform
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supports dynamic DMA mapping in hardware) in your driver structures and/or
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in the card registers.
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All drivers should be using these interfaces with no exceptions. It
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is planned to completely remove virt_to_bus() and bus_to_virt() as
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they are entirely deprecated. Some ports already do not provide these
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as it is impossible to correctly support them.
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Handling Errors
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===============
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@ -41,7 +41,6 @@ Library functionality that is used throughout the kernel.
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rbtree
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generic-radix-tree
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packing
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bus-virt-phys-mapping
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this_cpu_ops
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timekeeping
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errseq
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@ -52,7 +52,6 @@ Todolist:
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circular-buffers
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generic-radix-tree
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packing
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bus-virt-phys-mapping
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this_cpu_ops
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timekeeping
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errseq
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@ -17,7 +17,6 @@ config ALPHA
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select HAVE_PERF_EVENTS
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select NEED_DMA_MAP_STATE
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select NEED_SG_DMA_LENGTH
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select VIRT_TO_BUS
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select GENERIC_IRQ_PROBE
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select GENERIC_PCI_IOMAP
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select AUTO_IRQ_AFFINITY if SMP
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@ -20,7 +20,7 @@
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#define fd_free_dma() free_dma(FLOPPY_DMA)
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#define fd_clear_dma_ff() clear_dma_ff(FLOPPY_DMA)
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#define fd_set_dma_mode(mode) set_dma_mode(FLOPPY_DMA,mode)
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#define fd_set_dma_addr(addr) set_dma_addr(FLOPPY_DMA,virt_to_bus(addr))
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#define fd_set_dma_addr(addr) set_dma_addr(FLOPPY_DMA,isa_virt_to_bus(addr))
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#define fd_set_dma_count(count) set_dma_count(FLOPPY_DMA,count)
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#define fd_enable_irq() enable_irq(FLOPPY_IRQ)
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#define fd_disable_irq() disable_irq(FLOPPY_IRQ)
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@ -106,15 +106,15 @@ static inline void * phys_to_virt(unsigned long address)
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extern unsigned long __direct_map_base;
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extern unsigned long __direct_map_size;
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static inline unsigned long __deprecated virt_to_bus(volatile void *address)
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static inline unsigned long __deprecated isa_virt_to_bus(volatile void *address)
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{
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unsigned long phys = virt_to_phys(address);
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unsigned long bus = phys + __direct_map_base;
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return phys <= __direct_map_size ? bus : 0;
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}
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#define isa_virt_to_bus virt_to_bus
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#define isa_virt_to_bus isa_virt_to_bus
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static inline void * __deprecated bus_to_virt(unsigned long address)
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static inline void * __deprecated isa_bus_to_virt(unsigned long address)
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{
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void *virt;
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@ -125,7 +125,7 @@ static inline void * __deprecated bus_to_virt(unsigned long address)
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virt = phys_to_virt(address);
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return (long)address <= 0 ? NULL : virt;
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}
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#define isa_bus_to_virt bus_to_virt
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#define isa_bus_to_virt isa_bus_to_virt
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/*
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* There are different chipsets to interface the Alpha CPUs to the world.
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@ -39,7 +39,6 @@ config IA64
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select HAVE_FUNCTION_DESCRIPTORS
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select HAVE_VIRT_CPU_ACCOUNTING
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select HUGETLB_PAGE_SIZE_VARIABLE if HUGETLB_PAGE
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select VIRT_TO_BUS
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select GENERIC_IRQ_PROBE
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select GENERIC_PENDING_IRQ if SMP
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select GENERIC_IRQ_SHOW
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@ -96,14 +96,6 @@ extern u64 kern_mem_attribute (unsigned long phys_addr, unsigned long size);
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extern int valid_phys_addr_range (phys_addr_t addr, size_t count); /* efi.c */
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extern int valid_mmap_phys_addr_range (unsigned long pfn, size_t count);
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/*
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* The following two macros are deprecated and scheduled for removal.
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* Please use the PCI-DMA interface defined in <asm/pci.h> instead.
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*/
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#define bus_to_virt phys_to_virt
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#define virt_to_bus virt_to_phys
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#define page_to_bus page_to_phys
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# endif /* KERNEL */
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/*
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@ -30,7 +30,6 @@ config M68K
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select OLD_SIGACTION
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select OLD_SIGSUSPEND3
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select UACCESS_MEMCPY if !MMU
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select VIRT_TO_BUS
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select ZONE_DMA
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config CPU_BIG_ENDIAN
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@ -33,9 +33,11 @@ static inline void *phys_to_virt(unsigned long address)
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/*
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* IO bus memory addresses are 1:1 with the physical address,
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* deprecated globally but still used on two machines.
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*/
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#if defined(CONFIG_AMIGA) || defined(CONFIG_VME)
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#define virt_to_bus virt_to_phys
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#define bus_to_virt phys_to_virt
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#endif
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#endif
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#endif
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|
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@ -38,7 +38,6 @@ config MICROBLAZE
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select OF_EARLY_FLATTREE
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select PCI_DOMAINS_GENERIC if PCI
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select PCI_SYSCALL if PCI
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select VIRT_TO_BUS
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select CPU_NO_EFFICIENT_FFS
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select MMU_GATHER_NO_RANGE
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select SPARSE_IRQ
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|
|
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@ -30,8 +30,6 @@ extern resource_size_t isa_mem_base;
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#define PCI_IOBASE ((void __iomem *)_IO_BASE)
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#define IO_SPACE_LIMIT (0xFFFFFFFF)
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#define page_to_bus(page) (page_to_phys(page))
|
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|
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extern void iounmap(volatile void __iomem *addr);
|
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extern void __iomem *ioremap(phys_addr_t address, unsigned long size);
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|
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@ -100,7 +100,6 @@ config MIPS
|
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select RTC_LIB
|
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select SYSCTL_EXCEPTION_TRACE
|
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select TRACE_IRQFLAGS_SUPPORT
|
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select VIRT_TO_BUS
|
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select ARCH_HAS_ELFCORE_COMPAT
|
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select HAVE_ARCH_KCSAN if 64BIT
|
||||
|
||||
|
|
|
|||
|
|
@ -147,15 +147,6 @@ static inline void *isa_bus_to_virt(unsigned long address)
|
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return phys_to_virt(address);
|
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}
|
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|
||||
/*
|
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* However PCI ones are not necessarily 1:1 and therefore these interfaces
|
||||
* are forbidden in portable PCI drivers.
|
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*
|
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* Allow them for x86 for legacy drivers, though.
|
||||
*/
|
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#define virt_to_bus virt_to_phys
|
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#define bus_to_virt phys_to_virt
|
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|
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/*
|
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* Change "struct page" to physical address.
|
||||
*/
|
||||
|
|
|
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|
|
@ -43,7 +43,6 @@ config PARISC
|
|||
select SYSCTL_ARCH_UNALIGN_ALLOW
|
||||
select SYSCTL_EXCEPTION_TRACE
|
||||
select HAVE_MOD_ARCH_SPECIFIC
|
||||
select VIRT_TO_BUS
|
||||
select MODULES_USE_ELF_RELA
|
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select CLONE_BACKWARDS
|
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select TTY # Needed for pdc_cons.c
|
||||
|
|
|
|||
|
|
@ -179,7 +179,7 @@ static void _fd_chose_dma_mode(char *addr, unsigned long size)
|
|||
{
|
||||
if(can_use_virtual_dma == 2) {
|
||||
if((unsigned int) addr >= (unsigned int) high_memory ||
|
||||
virt_to_bus(addr) >= 0x1000000 ||
|
||||
virt_to_phys(addr) >= 0x1000000 ||
|
||||
_CROSS_64KB(addr, size, 0))
|
||||
use_virtual_dma = 1;
|
||||
else
|
||||
|
|
@ -215,7 +215,7 @@ static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
|
|||
doing_pdma = 0;
|
||||
clear_dma_ff(FLOPPY_DMA);
|
||||
set_dma_mode(FLOPPY_DMA,mode);
|
||||
set_dma_addr(FLOPPY_DMA,virt_to_bus(addr));
|
||||
set_dma_addr(FLOPPY_DMA,virt_to_phys(addr));
|
||||
set_dma_count(FLOPPY_DMA,size);
|
||||
enable_dma(FLOPPY_DMA);
|
||||
return 0;
|
||||
|
|
|
|||
|
|
@ -7,8 +7,6 @@
|
|||
|
||||
#define virt_to_phys(a) ((unsigned long)__pa(a))
|
||||
#define phys_to_virt(a) __va(a)
|
||||
#define virt_to_bus virt_to_phys
|
||||
#define bus_to_virt phys_to_virt
|
||||
|
||||
static inline unsigned long isa_bus_to_virt(unsigned long addr) {
|
||||
BUG();
|
||||
|
|
|
|||
|
|
@ -276,7 +276,6 @@ config PPC
|
|||
select SYSCTL_EXCEPTION_TRACE
|
||||
select THREAD_INFO_IN_TASK
|
||||
select TRACE_IRQFLAGS_SUPPORT
|
||||
select VIRT_TO_BUS if !PPC64
|
||||
#
|
||||
# Please keep this list sorted alphabetically.
|
||||
#
|
||||
|
|
|
|||
|
|
@ -985,8 +985,6 @@ static inline void * bus_to_virt(unsigned long address)
|
|||
}
|
||||
#define bus_to_virt bus_to_virt
|
||||
|
||||
#define page_to_bus(page) (page_to_phys(page) + PCI_DRAM_OFFSET)
|
||||
|
||||
#endif /* CONFIG_PPC32 */
|
||||
|
||||
/* access ports */
|
||||
|
|
|
|||
|
|
@ -167,7 +167,6 @@ extern phys_addr_t __phys_addr_symbol(unsigned long x);
|
|||
#define page_to_virt(page) (pfn_to_virt(page_to_pfn(page)))
|
||||
|
||||
#define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
|
||||
#define page_to_bus(page) (page_to_phys(page))
|
||||
#define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr)))
|
||||
|
||||
#define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x))
|
||||
|
|
|
|||
|
|
@ -278,7 +278,6 @@ config X86
|
|||
select THREAD_INFO_IN_TASK
|
||||
select TRACE_IRQFLAGS_SUPPORT
|
||||
select USER_STACKTRACE_SUPPORT
|
||||
select VIRT_TO_BUS
|
||||
select HAVE_ARCH_KCSAN if X86_64
|
||||
select X86_FEATURE_NAMES if PROC_FS
|
||||
select PROC_PID_ARCH_STATUS if PROC_FS
|
||||
|
|
|
|||
|
|
@ -169,15 +169,6 @@ static inline unsigned int isa_virt_to_bus(volatile void *address)
|
|||
}
|
||||
#define isa_bus_to_virt phys_to_virt
|
||||
|
||||
/*
|
||||
* However PCI ones are not necessarily 1:1 and therefore these interfaces
|
||||
* are forbidden in portable PCI drivers.
|
||||
*
|
||||
* Allow them on x86 for legacy drivers, though.
|
||||
*/
|
||||
#define virt_to_bus virt_to_phys
|
||||
#define bus_to_virt phys_to_virt
|
||||
|
||||
/*
|
||||
* The default ioremap() behavior is non-cached; if you need something
|
||||
* else, you probably want one of the following.
|
||||
|
|
|
|||
|
|
@ -50,7 +50,6 @@ config XTENSA
|
|||
select MODULES_USE_ELF_RELA
|
||||
select PERF_USE_VMALLOC
|
||||
select TRACE_IRQFLAGS_SUPPORT
|
||||
select VIRT_TO_BUS
|
||||
help
|
||||
Xtensa processors are 32-bit RISC machines designed by Tensilica
|
||||
primarily for embedded systems. These processors are both
|
||||
|
|
|
|||
|
|
@ -63,9 +63,6 @@ static inline void iounmap(volatile void __iomem *addr)
|
|||
xtensa_iounmap(addr);
|
||||
}
|
||||
|
||||
#define virt_to_bus virt_to_phys
|
||||
#define bus_to_virt phys_to_virt
|
||||
|
||||
#endif /* CONFIG_MMU */
|
||||
|
||||
#include <asm-generic/io.h>
|
||||
|
|
|
|||
|
|
@ -1142,20 +1142,6 @@ static inline void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
|
|||
}
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_VIRT_TO_BUS
|
||||
#ifndef virt_to_bus
|
||||
static inline unsigned long virt_to_bus(void *address)
|
||||
{
|
||||
return (unsigned long)address;
|
||||
}
|
||||
|
||||
static inline void *bus_to_virt(unsigned long address)
|
||||
{
|
||||
return (void *)address;
|
||||
}
|
||||
#endif
|
||||
#endif
|
||||
|
||||
#ifndef memset_io
|
||||
#define memset_io memset_io
|
||||
/**
|
||||
|
|
|
|||
|
|
@ -639,14 +639,6 @@ config BOUNCE
|
|||
memory available to the CPU. Enabled by default when HIGHMEM is
|
||||
selected, but you may say n to override this.
|
||||
|
||||
config VIRT_TO_BUS
|
||||
bool
|
||||
help
|
||||
An architecture should select this if it implements the
|
||||
deprecated interface virt_to_bus(). All new architectures
|
||||
should probably not select this.
|
||||
|
||||
|
||||
config MMU_NOTIFIER
|
||||
bool
|
||||
select SRCU
|
||||
|
|
|
|||
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