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MIPS: Make (UN)CAC_ADDR() PHYS_OFFSET-agnostic

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Converting an address between cached & uncached (typically addresses in
(c)kseg0 & (c)kseg1 or 2 xkphys regions) should not depend upon
PHYS_OFFSET in any way - we're converting from a virtual address in one
unmapped region to a virtual address in another unmapped region.

For some reason our CAC_ADDR() & UNCAC_ADDR() macros make use of
PAGE_OFFSET, which typically includes PHYS_OFFSET. This means that
platforms with a non-zero PHYS_OFFSET typically have to workaround
miscalculation by these 2 macros by also defining UNCAC_BASE to a value
that isn't really correct.

It appears that an attempt has previously been made to address this with
commit 3f4579252aa1 ("MIPS: make CAC_ADDR and UNCAC_ADDR account for
PHYS_OFFSET") which was later undone by commit ed3ce16c3d ("Revert
"MIPS: make CAC_ADDR and UNCAC_ADDR account for PHYS_OFFSET"") which
also introduced the ar7 workaround. That attempt at a fix was roughly
equivalent, but essentially caused the CAC_ADDR() & UNCAC_ADDR() macros
to cancel out PHYS_OFFSET by adding & then subtracting it again. In his
revert Leonid is correct that using PHYS_OFFSET makes no sense in the
context of these macros, but appears to have missed its inclusion via
PAGE_OFFSET which means PHYS_OFFSET actually had an effect after the
revert rather than before it.

Here we fix this by modifying CAC_ADDR() & UNCAC_ADDR() to stop using
PAGE_OFFSET (& thus PHYS_OFFSET), instead using __pa() & __va() along
with UNCAC_BASE.

For UNCAC_ADDR(), __pa() will convert a cached address to a physical
address which we can simply use as an offset from UNCAC_BASE to obtain
an address in the uncached region.

For CAC_ADDR() we can undo the effect of UNCAC_ADDR() by subtracting
UNCAC_BASE and using __va() on the result.

With this change made, remove definitions of UNCAC_BASE from the ar7 &
pic32 platforms which appear to have defined them only to workaround
this problem.

Signed-off-by: Paul Burton <paul.burton@mips.com>
References: 3f4579252aa1 ("MIPS: make CAC_ADDR and UNCAC_ADDR account for PHYS_OFFSET")
References: ed3ce16c3d ("Revert "MIPS: make CAC_ADDR and UNCAC_ADDR account for PHYS_OFFSET"")
Patchwork: https://patchwork.linux-mips.org/patch/20046/
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: Vladimir Kondratiev <vladimir.kondratiev@intel.com>
This commit is contained in:
Paul Burton
2018-07-27 18:23:18 -07:00
parent 28ec2238f3
commit 0d0e14770d
5 changed files with 4 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
arch/mips/include/asm/mach-ar7/spaces.h
View File

@@ -17,9 +17,6 @@
#define PAGE_OFFSET _AC(0x94000000, UL)
#define PHYS_OFFSET _AC(0x14000000, UL)
#define UNCAC_BASE _AC(0xb4000000, UL) /* 0xa0000000 + PHYS_OFFSET */
#define IO_BASE UNCAC_BASE
#include <asm/mach-generic/spaces.h>
#endif /* __ASM_AR7_SPACES_H */

1
arch/mips/include/asm/mach-pic32/spaces.h
View File

@@ -16,7 +16,6 @@
#ifdef CONFIG_PIC32MZDA
#define PHYS_OFFSET _AC(0x08000000, UL)
#define UNCAC_BASE _AC(0xa8000000, UL)
#endif
#include <asm/mach-generic/spaces.h>

4
arch/mips/include/asm/page.h
View File

@@ -252,8 +252,8 @@ 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) ((addr) - PAGE_OFFSET + UNCAC_BASE)
#define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
#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>

2
arch/mips/jazz/jazzdma.c
View File

@@ -576,7 +576,7 @@ static void *jazz_dma_alloc(struct device *dev, size_t size,
if (!(attrs & DMA_ATTR_NON_CONSISTENT)) {
dma_cache_wback_inv((unsigned long)ret, size);
ret = UNCAC_ADDR(ret);
ret = (void *)UNCAC_ADDR(ret);
}
return ret;
}

2
arch/mips/mm/dma-noncoherent.c
View File

@@ -78,7 +78,7 @@ void *arch_dma_alloc(struct device *dev, size_t size,
if (!dev_is_coherent(dev) && !(attrs & DMA_ATTR_NON_CONSISTENT)) {
dma_cache_wback_inv((unsigned long) ret, size);
ret = UNCAC_ADDR(ret);
ret = (void *)UNCAC_ADDR(ret);
}
return ret;