search for: pkmap_page_t

...highmem.h +++ b/arch/powerpc/include/asm/highmem.h @@ -24,12 +24,10 @@ #ifdef __KERNEL__ #include <linux/interrupt.h> -#include <asm/kmap_types.h> #include <asm/cacheflush.h> #include <asm/page.h> #include <asm/fixmap.h> -extern pte_t *kmap_pte; extern pte_t *pkmap_page_table; /* @@ -60,6 +58,11 @@ extern pte_t *pkmap_page_table; #define flush_cache_kmaps() flush_cache_all() +#define arch_kmap_local_post_map(vaddr, pteval) \ + local_flush_tlb_page(NULL, vaddr) +#define arch_kmap_local_post_unmap(vaddr) \ + local_flush_tlb_page(NULL, vaddr) + #endif /* __KER...

...m/highmem.h +++ b/arch/arm/include/asm/highmem.h @@ -2,7 +2,7 @@ #ifndef _ASM_HIGHMEM_H #define _ASM_HIGHMEM_H -#include <asm/kmap_types.h> +#include <asm/kmap_size.h> #define PKMAP_BASE (PAGE_OFFSET - PMD_SIZE) #define LAST_PKMAP PTRS_PER_PTE @@ -46,19 +46,32 @@ extern pte_t *pkmap_page_table; #ifdef ARCH_NEEDS_KMAP_HIGH_GET extern void *kmap_high_get(struct page *page); -#else + +static inline void *arch_kmap_local_high_get(struct page *page) +{ + if (IS_ENABLED(CONFIG_DEBUG_HIGHMEM) && !cache_is_vivt()) + return NULL; + return kmap_high_get(page); +} +#define arch_kma...

...MAX_IDX slots per + * CPU. So the number of CPUs sharing a single PTE page is limited. * * - pkmap being preemptible, in theory could do with more than 256 concurrent * mappings. However, generic pkmap code: map_new_virtual(), doesn't traverse @@ -47,48 +46,6 @@ */ extern pte_t * pkmap_page_table; -static pte_t * fixmap_page_table; - -void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) -{ - int idx, cpu_idx; - unsigned long vaddr; - - cpu_idx = kmap_atomic_idx_push(); - idx = cpu_idx + KM_TYPE_NR * smp_processor_id(); - vaddr = FIXMAP_ADDR(idx); - - set_pte_at(&init_mm, va...

Following up to the discussion in: https://lore.kernel.org/r/20200914204209.256266093 at linutronix.de and the second version of this: https://lore.kernel.org/r/20201029221806.189523375 at linutronix.de this series provides a preemptible variant of kmap_atomic & related interfaces. This is achieved by: - Removing the RT dependency from migrate_disable/enable() - Consolidating all

Following up to the discussion in: https://lore.kernel.org/r/20200914204209.256266093 at linutronix.de and the second version of this: https://lore.kernel.org/r/20201029221806.189523375 at linutronix.de this series provides a preemptible variant of kmap_atomic & related interfaces. This is achieved by: - Removing the RT dependency from migrate_disable/enable() - Consolidating all

Following up to the discussion in: https://lore.kernel.org/r/20200914204209.256266093 at linutronix.de and the second version of this: https://lore.kernel.org/r/20201029221806.189523375 at linutronix.de this series provides a preemptible variant of kmap_atomic & related interfaces. This is achieved by: - Removing the RT dependency from migrate_disable/enable() - Consolidating all

...CON_MEM_BASE, __end_of_fixed_addresses --- a/arch/nds32/include/asm/highmem.h +++ b/arch/nds32/include/asm/highmem.h @@ -5,7 +5,6 @@ #define _ASM_HIGHMEM_H #include <asm/proc-fns.h> -#include <asm/kmap_types.h> #include <asm/fixmap.h> /* @@ -45,11 +44,22 @@ extern pte_t *pkmap_page_table; extern void kmap_init(void); /* - * The following functions are already defined by <linux/highmem.h> - * when CONFIG_HIGHMEM is not set. + * FIXME: The below looks broken vs. a kmap_atomic() in task context which + * is interupted and another kmap_atomic() happens in interrupt contex...

...@@ #include <linux/interrupt.h> #include <linux/uaccess.h> #include <asm/cpu-features.h> -#include <asm/kmap_types.h> +#include <asm/kmap_size.h> /* declarations for highmem.c */ extern unsigned long highstart_pfn, highend_pfn; @@ -48,11 +48,11 @@ extern pte_t *pkmap_page_table; #define ARCH_HAS_KMAP_FLUSH_TLB extern void kmap_flush_tlb(unsigned long addr); -extern void *kmap_atomic_pfn(unsigned long pfn); #define flush_cache_kmaps() BUG_ON(cpu_has_dc_aliases) -extern void kmap_init(void); +#define arch_kmap_local_post_map(vaddr, pteval) local_flush_tlb_one(v...

...+{ + return NULL; +} +#endif + +/* Unmap a local mapping which was obtained by kmap_high_get() */ +static inline void kmap_high_unmap_local(unsigned long vaddr) +{ +#ifdef ARCH_NEEDS_KMAP_HIGH_GET + if (vaddr >= PKMAP_ADDR(0) && vaddr < PKMAP_ADDR(LAST_PKMAP)) + kunmap_high(pte_page(pkmap_page_table[PKMAP_NR(vaddr)])); +#endif +} + +static inline int kmap_local_calc_idx(int idx) +{ + return idx + KM_MAX_IDX * smp_processor_id(); +} + +static pte_t *__kmap_pte; + +static pte_t *kmap_get_pte(void) +{ + if (!__kmap_pte) + __kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); + return __k...

I''m sure everyone has seen the drop of VMI patches for Linux at this point, but just in case, the link is included below. I''ve read this version of the VMI spec and have made my way through most of the patches. While I wasn''t really that impressed with the first spec wrt Xen, the second version seems to be much more palatable. Specifically, the code inlining and

...-104,7 +104,7 @@ static inline wait_queue_head_t *get_pkm atomic_long_t _totalhigh_pages __read_mostly; EXPORT_SYMBOL(_totalhigh_pages); -unsigned int nr_free_highpages (void) +unsigned int __nr_free_highpages (void) { struct zone *zone; unsigned int pages = 0; @@ -141,7 +141,7 @@ pte_t * pkmap_page_table; do { spin_unlock(&kmap_lock); (void)(flags); } while (0) #endif -struct page *kmap_to_page(void *vaddr) +struct page *__kmap_to_page(void *vaddr) { unsigned long addr = (unsigned long)vaddr; @@ -152,7 +152,7 @@ struct page *kmap_to_page(void *vaddr) return virt_to_page(addr)...