diff options
Diffstat (limited to 'linux-core/drm_compat.c')
| -rw-r--r-- | linux-core/drm_compat.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/linux-core/drm_compat.c b/linux-core/drm_compat.c index e95269ec..b7b8e395 100644 --- a/linux-core/drm_compat.c +++ b/linux-core/drm_compat.c @@ -779,3 +779,32 @@ struct pci_dev * pci_get_bus_and_slot(unsigned int bus, unsigned int devfn) } EXPORT_SYMBOL(pci_get_bus_and_slot); #endif + +#if defined(DRM_KMAP_ATOMIC_PROT_PFN) && defined(CONFIG_HIMEM) +#define drm_kmap_get_fixmap_pte(vaddr) \ + pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), vaddr), (vaddr)), (vaddr)) + +void *kmap_atomic_prot_pfn(unsigned long pfn, enum km_type type, + pgprot_t protection) +{ + enum fixed_addresses idx; + unsigned long vaddr; + static pte_t *km_pte; + static int initialized = 0; + + if (unlikely(!initialized)) { + km_pte = drm_kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN)); + initialized = 1; + } + + pagefault_disable(); + idx = type + KM_TYPE_NR*smp_processor_id(); + vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); + set_pte(km_pte-idx, pfn_pte(pfn, protection)); + + return (void*) vaddr; +} + +EXPORT_SYMBOL(kmap_atomic_prot_pfn); + + |