diff options
| author | John David Anglin <dave.anglin@bell.net> | 2019-06-03 01:12:40 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2019-06-06 14:12:22 +0200 |
| commit | 116d753308cf032159c7b7aa87c9605bb5354784 (patch) | |
| tree | f2642cc73c48384f7b7934d0c794d27121018ffd /drivers/parisc | |
| parent | parisc: configs: Remove useless UEVENT_HELPER_PATH (diff) | |
| download | linux-116d753308cf032159c7b7aa87c9605bb5354784.tar.xz linux-116d753308cf032159c7b7aa87c9605bb5354784.zip | |
parisc: Use lpa instruction to load physical addresses in driver code
Most I/O in the kernel is done using the kernel offset mapping.
However, there is one API that uses aliased kernel address ranges:
> The final category of APIs is for I/O to deliberately aliased address
> ranges inside the kernel. Such aliases are set up by use of the
> vmap/vmalloc API. Since kernel I/O goes via physical pages, the I/O
> subsystem assumes that the user mapping and kernel offset mapping are
> the only aliases. This isn't true for vmap aliases, so anything in
> the kernel trying to do I/O to vmap areas must manually manage
> coherency. It must do this by flushing the vmap range before doing
> I/O and invalidating it after the I/O returns.
For this reason, we should use the hardware lpa instruction to load the
physical address of kernel virtual addresses in the driver code.
I believe we only use the vmap/vmalloc API with old PA 1.x processors
which don't have a sba, so we don't hit this problem.
Tested on c3750, c8000 and rp3440.
Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'drivers/parisc')
| -rw-r--r-- | drivers/parisc/ccio-dma.c | 2 | ||||
| -rw-r--r-- | drivers/parisc/sba_iommu.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/drivers/parisc/ccio-dma.c b/drivers/parisc/ccio-dma.c index 9b434644524c..8362517b98f9 100644 --- a/drivers/parisc/ccio-dma.c +++ b/drivers/parisc/ccio-dma.c @@ -570,7 +570,7 @@ ccio_io_pdir_entry(u64 *pdir_ptr, space_t sid, unsigned long vba, ** "hints" parm includes the VALID bit! ** "dep" clobbers the physical address offset bits as well. */ - pa = virt_to_phys(vba); + pa = lpa(vba); asm volatile("depw %1,31,12,%0" : "+r" (pa) : "r" (hints)); ((u32 *)pdir_ptr)[1] = (u32) pa; diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c index 78df92600203..aefb03ebeaf8 100644 --- a/drivers/parisc/sba_iommu.c +++ b/drivers/parisc/sba_iommu.c @@ -572,7 +572,7 @@ sba_io_pdir_entry(u64 *pdir_ptr, space_t sid, unsigned long vba, u64 pa; /* physical address */ register unsigned ci; /* coherent index */ - pa = virt_to_phys(vba); + pa = lpa(vba); pa &= IOVP_MASK; asm("lci 0(%1), %0" : "=r" (ci) : "r" (vba)); |