system/freebsd-src
system/freebsd-src
1
0
Fork 0
mirror of https://github.com/freebsd/freebsd-src synced 2024-10-15 21:05:08 +00:00
Code Issues Packages Projects Releases Wiki Activity

linuxkpi: Make arch_io_*_memtype_wc amd64-only

Browse source 
Linux only implements these functions on x86.  They return 0 on other
architectures.  The FreeBSD implementation calls PHYS_TO_DMAP but this
panics on i386 because it does not have a direct map so return 0 on i386
as well for now.  These functions are only used by graphics/drm-*-kmod
to mark the VRAM aperture write-combining but this is also accomplished
by a call to vm_phys_fictitious_reg_range so this change is sufficient
to fix drm-*-kmod on i386 for FreeBSD 14.1.

Reviewed by:	kib
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D45125
This commit is contained in:
Tijl Coosemans 2024-05-08 20:49:56 +02:00
parent 22b3e7898e
commit 2ae0f5a4d0
1 changed files with 4 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
sys/compat/linuxkpi/common/include/linux/io.h
View file

@ -541,30 +541,29 @@ void lkpi_arch_phys_wc_del(int);
#define arch_phys_wc_index(x) \
(((x) < __MTRR_ID_BASE) ? -1 : ((x) - __MTRR_ID_BASE))
#if defined(__amd64__) || defined(__i386__) || defined(__aarch64__) || defined(__powerpc__) || defined(__riscv)
static inline int
arch_io_reserve_memtype_wc(resource_size_t start, resource_size_t size)
{
#if defined(__amd64__)
vm_offset_t va;
va = PHYS_TO_DMAP(start);
#ifdef VM_MEMATTR_WRITE_COMBINING
return (-pmap_change_attr(va, size, VM_MEMATTR_WRITE_COMBINING));
#else
return (-pmap_change_attr(va, size, VM_MEMATTR_UNCACHEABLE));
return (0);
#endif
}
static inline void
arch_io_free_memtype_wc(resource_size_t start, resource_size_t size)
{
#if defined(__amd64__)
vm_offset_t va;
va = PHYS_TO_DMAP(start);
pmap_change_attr(va, size, VM_MEMATTR_WRITE_BACK);
}
#endif
}
#endif /* _LINUXKPI_LINUX_IO_H_ */