ascend inclusion category: Feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8LNGH

---------------------------------------------

The do_mmap/mmap_region/__mm_populate/do_mbind could only be used to handle the current process, now the share pool need to handle the other process and create memory mmaping, so need to export new function to distinguish different process and handle it, it would not break the current logic and only valid for share pool.

Signed-off-by: Wang Wensheng wangwensheng4@huawei.com --- include/linux/mempolicy.h | 11 +++++++++++ include/linux/mm.h | 11 +++++++++++ mm/gup.c | 23 ++++++++++++++--------- mm/mempolicy.c | 12 +++++++++--- mm/mmap.c | 34 +++++++++++++++++++++++++++------- 5 files changed, 72 insertions(+), 19 deletions(-)

diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h index 6c2754d7bfed..ca62e945e4f7 100644 --- a/include/linux/mempolicy.h +++ b/include/linux/mempolicy.h @@ -184,6 +184,9 @@ static inline bool mpol_is_preferred_many(struct mempolicy *pol)

extern bool apply_policy_zone(struct mempolicy *policy, enum zone_type zone);

+extern long __do_mbind(unsigned long start, unsigned long len, + unsigned short mode, unsigned short mode_flags, + nodemask_t *nmask, unsigned long flags, struct mm_struct *mm); #else

struct mempolicy {}; @@ -294,5 +297,13 @@ static inline bool mpol_is_preferred_many(struct mempolicy *pol) return false; }

+static inline long __do_mbind(unsigned long start, unsigned long len, + unsigned short mode, unsigned short mode_flags, + nodemask_t *nmask, unsigned long flags, struct mm_struct *mm) +{ + return 0; +} + + #endif /* CONFIG_NUMA */ #endif diff --git a/include/linux/mm.h b/include/linux/mm.h index 8cf86b56aba5..4fe823ead243 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3288,6 +3288,10 @@ extern unsigned long do_mmap(struct file *file, unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate, struct list_head *uf); +extern unsigned long __do_mmap_mm(struct mm_struct *mm, struct file *file, unsigned long addr, + unsigned long len, unsigned long prot, + unsigned long flags, vm_flags_t vm_flags, unsigned long pgoff, + unsigned long *populate, struct list_head *uf); extern int do_vmi_munmap(struct vma_iterator *vmi, struct mm_struct *mm, unsigned long start, size_t len, struct list_head *uf, bool unlock); @@ -3301,6 +3305,8 @@ extern int do_vma_munmap(struct vma_iterator *vmi, struct vm_area_struct *vma, struct list_head *uf, bool unlock); extern int __mm_populate(unsigned long addr, unsigned long len, int ignore_errors); +extern int do_mm_populate(struct mm_struct *mm, unsigned long start, unsigned long len, + int ignore_errors); static inline void mm_populate(unsigned long addr, unsigned long len) { /* Ignore errors */ @@ -3308,6 +3314,11 @@ static inline void mm_populate(unsigned long addr, unsigned long len) } #else static inline void mm_populate(unsigned long addr, unsigned long len) {} +static inline int do_mm_populate(struct mm_struct *mm, unsigned long start, unsigned long len, + int ignore_errors) +{ + return -EPERM; +} #endif

/* These take the mm semaphore themselves */ diff --git a/mm/gup.c b/mm/gup.c index 2f8a2d89fde1..813add0d3a74 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -1727,16 +1727,9 @@ long faultin_vma_page_range(struct vm_area_struct *vma, unsigned long start, return ret; }

-/* - * __mm_populate - populate and/or mlock pages within a range of address space. - * - * This is used to implement mlock() and the MAP_POPULATE / MAP_LOCKED mmap - * flags. VMAs must be already marked with the desired vm_flags, and - * mmap_lock must not be held. - */ -int __mm_populate(unsigned long start, unsigned long len, int ignore_errors) +int do_mm_populate(struct mm_struct *mm, unsigned long start, unsigned long len, + int ignore_errors) { - struct mm_struct *mm = current->mm; unsigned long end, nstart, nend; struct vm_area_struct *vma = NULL; int locked = 0; @@ -1787,6 +1780,18 @@ int __mm_populate(unsigned long start, unsigned long len, int ignore_errors) mmap_read_unlock(mm); return ret; /* 0 or negative error code */ } + +/* + * __mm_populate - populate and/or mlock pages within a range of address space. + * + * This is used to implement mlock() and the MAP_POPULATE / MAP_LOCKED mmap + * flags. VMAs must be already marked with the desired vm_flags, and + * mmap_lock must not be held. + */ +int __mm_populate(unsigned long start, unsigned long len, int ignore_errors) +{ + return do_mm_populate(current->mm, start, len, ignore_errors); +} #else /* CONFIG_MMU */ static long __get_user_pages_locked(struct mm_struct *mm, unsigned long start, unsigned long nr_pages, struct page **pages, diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 4b8447f8175b..b23a239de750 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1262,11 +1262,10 @@ static struct folio *new_folio(struct folio *src, unsigned long start) } #endif

-static long do_mbind(unsigned long start, unsigned long len, +long __do_mbind(unsigned long start, unsigned long len, unsigned short mode, unsigned short mode_flags, - nodemask_t *nmask, unsigned long flags) + nodemask_t *nmask, unsigned long flags, struct mm_struct *mm) { - struct mm_struct *mm = current->mm; struct vm_area_struct *vma, *prev; struct vma_iterator vmi; struct mempolicy *new; @@ -1377,6 +1376,13 @@ static long do_mbind(unsigned long start, unsigned long len, return err; }

+static long do_mbind(unsigned long start, unsigned long len, + unsigned short mode, unsigned short mode_flags, + nodemask_t *nmask, unsigned long flags) +{ + return __do_mbind(start, len, mode, mode_flags, nmask, flags, current->mm); +} + /* * User space interface with variable sized bitmaps for nodelists. */ diff --git a/mm/mmap.c b/mm/mmap.c index 9e018d8dd7d6..df2624e48119 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1197,16 +1197,19 @@ static inline bool file_mmap_ok(struct file *file, struct inode *inode, return true; }

+static unsigned long __mmap_region(struct mm_struct *mm, + struct file *file, unsigned long addr, + unsigned long len, vm_flags_t vm_flags, + unsigned long pgoff, struct list_head *uf); /* * The caller must write-lock current->mm->mmap_lock. */ -unsigned long do_mmap(struct file *file, unsigned long addr, +unsigned long __do_mmap_mm(struct mm_struct *mm, struct file *file, unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate, struct list_head *uf) { - struct mm_struct *mm = current->mm; int pkey = 0;

*populate = 0; @@ -1371,7 +1374,7 @@ unsigned long do_mmap(struct file *file, unsigned long addr, vm_flags |= VM_NORESERVE; }

- addr = mmap_region(file, addr, len, vm_flags, pgoff, uf); + addr = __mmap_region(mm, file, addr, len, vm_flags, pgoff, uf); if (!IS_ERR_VALUE(addr) && ((vm_flags & VM_LOCKED) || (flags & (MAP_POPULATE | MAP_NONBLOCK)) == MAP_POPULATE)) @@ -1379,6 +1382,16 @@ unsigned long do_mmap(struct file *file, unsigned long addr, return addr; }

+unsigned long do_mmap(struct file *file, unsigned long addr, + unsigned long len, unsigned long prot, + unsigned long flags, vm_flags_t vm_flags, + unsigned long pgoff, unsigned long *populate, + struct list_head *uf) +{ + return __do_mmap_mm(current->mm, file, addr, len, prot, flags, + vm_flags, pgoff, populate, uf); +} + unsigned long ksys_mmap_pgoff(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long fd, unsigned long pgoff) @@ -2659,11 +2672,11 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len, return do_vmi_munmap(&vmi, mm, start, len, uf, false); }

-unsigned long mmap_region(struct file *file, unsigned long addr, - unsigned long len, vm_flags_t vm_flags, unsigned long pgoff, - struct list_head *uf) +static unsigned long __mmap_region(struct mm_struct *mm, + struct file *file, unsigned long addr, + unsigned long len, vm_flags_t vm_flags, + unsigned long pgoff, struct list_head *uf) { - struct mm_struct *mm = current->mm; struct vm_area_struct *vma = NULL; struct vm_area_struct *next, *prev, *merge; pgoff_t pglen = len >> PAGE_SHIFT; @@ -2915,6 +2928,13 @@ unsigned long mmap_region(struct file *file, unsigned long addr, return error; }

+unsigned long mmap_region(struct file *file, unsigned long addr, + unsigned long len, vm_flags_t vm_flags, unsigned long pgoff, + struct list_head *uf) +{ + return __mmap_region(current->mm, file, addr, len, vm_flags, pgoff, uf); +} + static int __vm_munmap(unsigned long start, size_t len, bool unlock) { int ret;

ascend inclusion category: Feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8LNGH

---------------------------------------------

The sp_area structure specify a memory region used for share_pool. Add alloc/get/drop operations for sp-area. The sp_mapping structure manage a set of sp_area.

Signed-off-by: Wang Wensheng wangwensheng4@huawei.com --- mm/share_pool.c | 953 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 953 insertions(+)

diff --git a/mm/share_pool.c b/mm/share_pool.c index a9e30b06486e..d12150626496 100644 --- a/mm/share_pool.c +++ b/mm/share_pool.c @@ -52,6 +52,625 @@ #include <linux/pagewalk.h> #include <linux/workqueue.h>

+/* Use spa va address as mmap offset. This can work because spa_file + * is setup with 64-bit address space. So va shall be well covered. + */ +#define addr_offset(spa) ((spa)->va_start) + +#define byte2kb(size) ((size) >> 10) +#define byte2mb(size) ((size) >> 20) +#define page2kb(page_num) ((page_num) << (PAGE_SHIFT - 10)) + +#define MAX_GROUP_FOR_SYSTEM 50000 +#define MAX_GROUP_FOR_TASK 3000 +#define MAX_PROC_PER_GROUP 1024 + +#define GROUP_NONE 0 + +#define SEC2US(sec) ((sec) * 1000000) +#define NS2US(ns) ((ns) / 1000) + +#define PF_DOMAIN_CORE 0x10000000 /* AOS CORE processes in sched.h */ + +static int system_group_count; + +/* idr of all sp_groups */ +static DEFINE_IDR(sp_group_idr); +/* rw semaphore for sp_group_idr and mm->sp_group_master */ +static DECLARE_RWSEM(sp_global_sem); + +/*** Statistical and maintenance tools ***/ + +/* list of all sp_group_masters */ +static LIST_HEAD(master_list); +/* mutex to protect insert/delete ops from master_list */ +static DEFINE_MUTEX(master_list_lock); + +/* list of all spm-dvpp */ +static LIST_HEAD(spm_dvpp_list); +/* mutex to protect insert/delete ops from master_list */ +static DEFINE_MUTEX(spm_list_lock); + +#define SEQ_printf(m, x...) \ +do { \ + if (m) \ + seq_printf(m, x); \ + else \ + pr_info(x); \ +} while (0) + +struct sp_meminfo { + /* not huge page size from sp_alloc */ + atomic64_t alloc_nsize; + /* huge page size from sp_alloc */ + atomic64_t alloc_hsize; + /* total size from sp_k2u */ + atomic64_t k2u_size; +}; + +enum sp_mapping_type { + SP_MAPPING_START, + SP_MAPPING_DVPP = SP_MAPPING_START, + SP_MAPPING_NORMAL, + SP_MAPPING_RO, + SP_MAPPING_END, +}; + +/* + * address space management + */ +struct sp_mapping { + unsigned long type; + atomic_t user; + unsigned long start[MAX_DEVID]; + unsigned long end[MAX_DEVID]; + struct rb_root area_root; + + struct rb_node *free_area_cache; + unsigned long cached_hole_size; + unsigned long cached_vstart; + + /* list head for all groups attached to this mapping, dvpp mapping only */ + struct list_head group_head; + struct list_head spm_node; + spinlock_t sp_mapping_lock; +}; + +/* Processes in the same sp_group can share memory. + * Memory layout for share pool: + * + * |-------------------- 8T -------------------|---|------ 8T ------------| + * | Device 0 | Device 1 |...| | + * |----------------------------------------------------------------------| + * |------------- 16G -------------| 16G | | | + * | DVPP GROUP0 | DVPP GROUP1 | ... | ... |...| sp normal memory | + * | sp | sp | | | | | + * |----------------------------------------------------------------------| + * + * The host SVM feature reserves 8T virtual memory by mmap, and due to the + * restriction of DVPP, while SVM and share pool will both allocate memory + * for DVPP, the memory have to be in the same 32G range. + * + * Share pool reserves 16T memory, with 8T for normal uses and 8T for DVPP. + * Within this 8T DVPP memory, SVM will call sp_config_dvpp_range() to + * tell us which 16G memory range is reserved for share pool . + * + * In some scenarios where there is no host SVM feature, share pool uses + * the default 8G memory setting for DVPP. + */ +struct sp_group { + int id; + struct file *file; + struct file *file_hugetlb; + /* number of process in this group */ + int proc_num; + /* list head of processes (sp_group_node, each represents a process) */ + struct list_head proc_head; + /* it is protected by rw_lock of this spg */ + struct rb_root spa_root; + /* group statistics */ + struct sp_meminfo meminfo; + atomic_t use_count; + atomic_t spa_num; + /* protect the group internal elements */ + struct rw_semaphore rw_lock; + /* list node for dvpp mapping */ + struct list_head mnode; + struct sp_mapping *mapping[SP_MAPPING_END]; +}; + +/* a per-process(per mm) struct which manages a sp_group_node list */ +struct sp_group_master { + pid_t tgid; + /* + * number of sp groups the process belongs to, + * a.k.a the number of sp_node in group_head + */ + unsigned int group_num; + /* list head of sp_node */ + struct list_head group_head; + struct mm_struct *mm; + /* + * Used to apply for the shared pool memory of the current process. + * For example, sp_alloc non-share memory or k2task. + */ + struct sp_group *local; + struct sp_meminfo meminfo; + struct list_head list_node; + char comm[TASK_COMM_LEN]; +}; + +/* + * each instance represents an sp group the process belongs to + * sp_group_master : sp_group_node = 1 : N + * sp_group_node->spg : sp_group = 1 : 1 + * sp_group_node : sp_group->proc_head = N : 1 + */ +struct sp_group_node { + /* list node in sp_group->proc_head */ + struct list_head proc_node; + /* list node in sp_group_maseter->group_head */ + struct list_head group_node; + struct sp_group_master *master; + struct sp_group *spg; + unsigned long prot; + + /* + * alloc amount minus free amount, may be negative when freed by + * another task in the same sp group. + */ + struct sp_meminfo meminfo; +}; + +static inline void sp_add_group_master(struct sp_group_master *master) +{ + mutex_lock(&master_list_lock); + list_add_tail(&master->list_node, &master_list); + mutex_unlock(&master_list_lock); +} + +static inline void sp_del_group_master(struct sp_group_master *master) +{ + mutex_lock(&master_list_lock); + list_del(&master->list_node); + mutex_unlock(&master_list_lock); +} + +static void meminfo_init(struct sp_meminfo *meminfo) +{ + memset(meminfo, 0, sizeof(struct sp_meminfo)); +} + +static void meminfo_inc_usage(unsigned long size, bool huge, struct sp_meminfo *meminfo) +{ + if (huge) + atomic64_add(size, &meminfo->alloc_hsize); + else + atomic64_add(size, &meminfo->alloc_nsize); +} + +static void meminfo_dec_usage(unsigned long size, bool huge, struct sp_meminfo *meminfo) +{ + if (huge) + atomic64_sub(size, &meminfo->alloc_hsize); + else + atomic64_sub(size, &meminfo->alloc_nsize); +} + +static void meminfo_inc_k2u(unsigned long size, struct sp_meminfo *meminfo) +{ + atomic64_add(size, &meminfo->k2u_size); +} + +static void meminfo_dec_k2u(unsigned long size, struct sp_meminfo *meminfo) +{ + atomic64_sub(size, &meminfo->k2u_size); +} + +static inline long meminfo_alloc_sum(struct sp_meminfo *meminfo) +{ + return atomic64_read(&meminfo->alloc_nsize) + + atomic64_read(&meminfo->alloc_hsize); +} + +static inline long meminfo_alloc_sum_byKB(struct sp_meminfo *meminfo) +{ + return byte2kb(meminfo_alloc_sum(meminfo)); +} + +static inline long meminfo_k2u_size(struct sp_meminfo *meminfo) +{ + return byte2kb(atomic64_read(&meminfo->k2u_size)); +} + +static inline long long meminfo_total_size(struct sp_meminfo *meminfo) +{ + return atomic64_read(&meminfo->alloc_nsize) + + atomic64_read(&meminfo->alloc_hsize) + + atomic64_read(&meminfo->k2u_size); +} + +static unsigned long sp_mapping_type(struct sp_mapping *spm) +{ + return spm->type; +} + +static void sp_mapping_set_type(struct sp_mapping *spm, unsigned long type) +{ + spm->type = type; +} + +static struct sp_mapping *sp_mapping_normal; +static struct sp_mapping *sp_mapping_ro; + +static void sp_mapping_add_to_list(struct sp_mapping *spm) +{ + mutex_lock(&spm_list_lock); + if (sp_mapping_type(spm) == SP_MAPPING_DVPP) + list_add_tail(&spm->spm_node, &spm_dvpp_list); + mutex_unlock(&spm_list_lock); +} + +static void sp_mapping_remove_from_list(struct sp_mapping *spm) +{ + mutex_lock(&spm_list_lock); + if (sp_mapping_type(spm) == SP_MAPPING_DVPP) + list_del(&spm->spm_node); + mutex_unlock(&spm_list_lock); +} + +static void sp_mapping_range_init(struct sp_mapping *spm) +{ + int i; + + for (i = 0; i < MAX_DEVID; i++) { + switch (sp_mapping_type(spm)) { + case SP_MAPPING_RO: + spm->start[i] = MMAP_SHARE_POOL_RO_START; + spm->end[i] = MMAP_SHARE_POOL_RO_END; + break; + case SP_MAPPING_NORMAL: + spm->start[i] = MMAP_SHARE_POOL_NORMAL_START; + spm->end[i] = MMAP_SHARE_POOL_NORMAL_END; + break; + case SP_MAPPING_DVPP: + spm->start[i] = MMAP_SHARE_POOL_DVPP_START + i * MMAP_SHARE_POOL_16G_SIZE; + spm->end[i] = spm->start[i] + MMAP_SHARE_POOL_16G_SIZE; + break; + default: + pr_err("Invalid sp_mapping type [%lu]\n", sp_mapping_type(spm)); + break; + } + } +} + +static struct sp_mapping *sp_mapping_create(unsigned long type) +{ + struct sp_mapping *spm; + + spm = kzalloc(sizeof(struct sp_mapping), GFP_KERNEL); + if (!spm) + return NULL; + + sp_mapping_set_type(spm, type); + sp_mapping_range_init(spm); + atomic_set(&spm->user, 0); + spm->area_root = RB_ROOT; + INIT_LIST_HEAD(&spm->group_head); + spin_lock_init(&spm->sp_mapping_lock); + sp_mapping_add_to_list(spm); + + return spm; +} + +static void sp_mapping_destroy(struct sp_mapping *spm) +{ + sp_mapping_remove_from_list(spm); + kfree(spm); +} + +static void sp_mapping_attach(struct sp_group *spg, struct sp_mapping *spm) +{ + unsigned long type = sp_mapping_type(spm); + + atomic_inc(&spm->user); + spg->mapping[type] = spm; + if (type == SP_MAPPING_DVPP) + list_add_tail(&spg->mnode, &spm->group_head); +} + +static void sp_mapping_detach(struct sp_group *spg, struct sp_mapping *spm) +{ + unsigned long type; + + if (!spm) + return; + + type = sp_mapping_type(spm); + if (type == SP_MAPPING_DVPP) + list_del(&spg->mnode); + if (atomic_dec_and_test(&spm->user)) + sp_mapping_destroy(spm); + + spg->mapping[type] = NULL; +} + +/* merge old mapping to new, and the old mapping would be destroyed */ +static void sp_mapping_merge(struct sp_mapping *new, struct sp_mapping *old) +{ + struct sp_group *spg, *tmp; + + if (new == old) + return; + + list_for_each_entry_safe(spg, tmp, &old->group_head, mnode) { + list_move_tail(&spg->mnode, &new->group_head); + spg->mapping[SP_MAPPING_DVPP] = new; + } + + atomic_add(atomic_read(&old->user), &new->user); + sp_mapping_destroy(old); +} + +static bool is_mapping_empty(struct sp_mapping *spm) +{ + return RB_EMPTY_ROOT(&spm->area_root); +} + +static bool can_mappings_merge(struct sp_mapping *m1, struct sp_mapping *m2) +{ + int i; + + for (i = 0; i < MAX_DEVID; i++) + if (m1->start[i] != m2->start[i] || m1->end[i] != m2->end[i]) + return false; + + return true; +} + +/* + * 1. The mappings of local group is set on creating. + * 2. This is used to setup the mapping for groups created during add_task. + * 3. The normal mapping exists for all groups. + * 4. The dvpp mappings for the new group and local group can merge _iff_ at + * least one of the mapping is empty. + * the caller must hold sp_global_sem + * NOTE: undo the mergeing when the later process failed. + */ +static int sp_group_setup_mapping_normal(struct mm_struct *mm, struct sp_group *spg) +{ + struct sp_mapping *local_dvpp_mapping, *spg_dvpp_mapping; + + local_dvpp_mapping = mm->sp_group_master->local->mapping[SP_MAPPING_DVPP]; + spg_dvpp_mapping = spg->mapping[SP_MAPPING_DVPP]; + + if (!list_empty(&spg->proc_head)) { + /* + * Don't return an error when the mappings' address range conflict. + * As long as the mapping is unused, we can drop the empty mapping. + * This may change the address range for the task or group implicitly, + * give a warn for it. + */ + bool is_conflict = !can_mappings_merge(local_dvpp_mapping, spg_dvpp_mapping); + + if (is_mapping_empty(local_dvpp_mapping)) { + sp_mapping_merge(spg_dvpp_mapping, local_dvpp_mapping); + if (is_conflict) + pr_warn_ratelimited("task address space conflict, spg_id=%d\n", + spg->id); + } else if (is_mapping_empty(spg_dvpp_mapping)) { + sp_mapping_merge(local_dvpp_mapping, spg_dvpp_mapping); + if (is_conflict) + pr_warn_ratelimited("group address space conflict, spg_id=%d\n", + spg->id); + } else { + pr_info_ratelimited("Duplicate address space, id=%d\n", spg->id); + return -EINVAL; + } + } else { + /* the mapping of local group is always set */ + sp_mapping_attach(spg, local_dvpp_mapping); + if (!spg->mapping[SP_MAPPING_NORMAL]) + sp_mapping_attach(spg, sp_mapping_normal); + if (!spg->mapping[SP_MAPPING_RO]) + sp_mapping_attach(spg, sp_mapping_ro); + } + + return 0; +} + +static inline bool is_local_group(int spg_id) +{ + return spg_id >= SPG_ID_LOCAL_MIN && spg_id <= SPG_ID_LOCAL_MAX; +} + +static void update_mem_usage_alloc(unsigned long size, bool inc, + bool is_hugepage, struct sp_group_node *spg_node) +{ + if (inc) { + meminfo_inc_usage(size, is_hugepage, &spg_node->meminfo); + meminfo_inc_usage(size, is_hugepage, &spg_node->master->meminfo); + } else { + meminfo_dec_usage(size, is_hugepage, &spg_node->meminfo); + meminfo_dec_usage(size, is_hugepage, &spg_node->master->meminfo); + } +} + +static void update_mem_usage_k2u(unsigned long size, bool inc, + struct sp_group_node *spg_node) +{ + if (inc) { + meminfo_inc_k2u(size, &spg_node->meminfo); + meminfo_inc_k2u(size, &spg_node->master->meminfo); + } else { + meminfo_dec_k2u(size, &spg_node->meminfo); + meminfo_dec_k2u(size, &spg_node->master->meminfo); + } +} + +struct sp_spa_stat { + atomic64_t alloc_num; + atomic64_t k2u_task_num; + atomic64_t k2u_spg_num; + atomic64_t alloc_size; + atomic64_t k2u_task_size; + atomic64_t k2u_spg_size; + atomic64_t dvpp_size; + atomic64_t dvpp_va_size; +}; + +static struct sp_spa_stat spa_stat; + +/* statistics of all sp group born from sp_alloc and k2u(spg) */ +struct sp_overall_stat { + atomic_t spa_total_num; + atomic64_t spa_total_size; +}; + +static struct sp_overall_stat sp_overall_stat; + +/*** Global share pool VA allocator ***/ + +enum spa_type { + SPA_TYPE_ALLOC = 1, + SPA_TYPE_K2TASK, + SPA_TYPE_K2SPG, +}; + +/* + * The lifetime for a sp_area: + * 1. The sp_area was created from a sp_mapping with sp_mapping_lock held. + * 2. The sp_area was added into a sp_group (using rb_tree). + * 3. The sp_area was mapped to all tasks in the sp_group and we bump its + * reference when each mmap succeeded. + * 4. When a new task was added into the sp_group, we map the sp_area into + * the new task and increase its reference count. + * 5. When a task was deleted from the sp_group, we unmap the sp_area for + * the task and decrease its reference count. + * 6. Also, we can use sp_free/sp_unshare to unmap the sp_area for all the + * tasks in the sp_group. And the reference count was decreased for each + * munmap. + * 7. When the refcount for sp_area reach zero: + * a. the sp_area would firstly be deleted from the sp_group and then + * deleted from sp_mapping. + * b. no one should use the sp_area from the view of sp_group. + * c. the spa->spg should not be used when the sp_area is not on a spg. + * + * The locking rules: + * 1. The newly created sp_area with a refcount of one. This is to distinct + * the new sp_area from a dying sp_area. + * 2. Use spg->rw_lock to protect all the sp_area in the sp_group. And the + * sp_area cannot be deleted without spg->rw_lock. + */ +struct sp_area { + unsigned long va_start; + unsigned long va_end; /* va_end always align to hugepage */ + unsigned long real_size; /* real size with alignment */ + unsigned long region_vstart; /* belong to normal region or DVPP region */ + unsigned long flags; + bool is_hugepage; + atomic_t use_count; /* How many vmas use this VA region */ + struct rb_node rb_node; /* address sorted rbtree */ + struct rb_node spg_link; /* link to the spg->rb_root */ + struct sp_group *spg; + struct sp_mapping *spm; /* where spa born from */ + enum spa_type type; + unsigned long kva; /* shared kva */ + pid_t applier; /* the original applier process */ + int preferred_node_id; /* memory node */ + struct work_struct work; +}; + +static unsigned long spa_size(struct sp_area *spa) +{ + return spa->real_size; +} + +static struct file *spa_file(struct sp_area *spa) +{ + if (spa->is_hugepage) + return spa->spg->file_hugetlb; + else + return spa->spg->file; +} + +/* the caller should hold sp_area_lock */ +static void spa_inc_usage(struct sp_area *spa) +{ + enum spa_type type = spa->type; + unsigned long size = spa->real_size; + bool is_dvpp = spa->flags & SP_DVPP; + bool is_huge = spa->is_hugepage; + + switch (type) { + case SPA_TYPE_ALLOC: + atomic64_inc(&spa_stat.alloc_num); + atomic64_add(size, &spa_stat.alloc_size); + meminfo_inc_usage(size, is_huge, &spa->spg->meminfo); + break; + case SPA_TYPE_K2TASK: + atomic64_inc(&spa_stat.k2u_task_num); + atomic64_add(size, &spa_stat.k2u_task_size); + meminfo_inc_k2u(size, &spa->spg->meminfo); + break; + case SPA_TYPE_K2SPG: + atomic64_inc(&spa_stat.k2u_spg_num); + atomic64_add(size, &spa_stat.k2u_spg_size); + meminfo_inc_k2u(size, &spa->spg->meminfo); + break; + default: + WARN(1, "invalid spa type"); + } + + if (is_dvpp) { + atomic64_add(size, &spa_stat.dvpp_size); + atomic64_add(ALIGN(size, PMD_SIZE), &spa_stat.dvpp_va_size); + } + + if (!is_local_group(spa->spg->id)) { + atomic_inc(&sp_overall_stat.spa_total_num); + atomic64_add(size, &sp_overall_stat.spa_total_size); + } +} + +/* the caller should hold sp_area_lock */ +static void spa_dec_usage(struct sp_area *spa) +{ + enum spa_type type = spa->type; + unsigned long size = spa->real_size; + bool is_dvpp = spa->flags & SP_DVPP; + bool is_huge = spa->is_hugepage; + + switch (type) { + case SPA_TYPE_ALLOC: + atomic64_dec(&spa_stat.alloc_num); + atomic64_sub(size, &spa_stat.alloc_size); + meminfo_dec_usage(size, is_huge, &spa->spg->meminfo); + break; + case SPA_TYPE_K2TASK: + atomic64_dec(&spa_stat.k2u_task_num); + atomic64_sub(size, &spa_stat.k2u_task_size); + meminfo_dec_k2u(size, &spa->spg->meminfo); + break; + case SPA_TYPE_K2SPG: + atomic64_dec(&spa_stat.k2u_spg_num); + atomic64_sub(size, &spa_stat.k2u_spg_size); + meminfo_dec_k2u(size, &spa->spg->meminfo); + break; + default: + WARN(1, "invalid spa type"); + } + + if (is_dvpp) { + atomic64_sub(size, &spa_stat.dvpp_size); + atomic64_sub(ALIGN(size, PMD_SIZE), &spa_stat.dvpp_va_size); + } + + if (!is_local_group(spa->spg->id)) { + atomic_dec(&sp_overall_stat.spa_total_num); + atomic64_sub(spa->real_size, &sp_overall_stat.spa_total_size); + } +} /** * mp_sp_group_id_by_pid() - Get the sp_group ID array of a process. * @tgid: tgid of target process. @@ -108,6 +727,323 @@ int mg_sp_id_of_current(void) } EXPORT_SYMBOL_GPL(mg_sp_id_of_current);

+#define insert_sp_area(__root, __spa, node, rb_node_param) \ + do { \ + struct rb_node **p = &((__root)->rb_node); \ + struct rb_node *parent = NULL; \ + while (*p) { \ + struct sp_area *tmp; \ + parent = *p; \ + tmp = rb_entry(parent, struct sp_area, rb_node_param);\ + if (__spa->va_start < tmp->va_end) \ + p = &(*p)->rb_left; \ + else if (__spa->va_end > tmp->va_start) \ + p = &(*p)->rb_right; \ + else \ + WARN(1, "duplicate spa of tree " #__root);\ + } \ + rb_link_node((node), parent, p); \ + rb_insert_color((node), (__root)); \ + } while (0) + +/* the caller must hold sp_mapping_lock */ +static void spm_insert_area(struct sp_mapping *spm, struct sp_area *spa) +{ + insert_sp_area(&spm->area_root, spa, &spa->rb_node, rb_node); +} + +static void sp_group_insert_area(struct sp_group *spg, struct sp_area *spa) +{ + insert_sp_area(&spg->spa_root, spa, &spa->spg_link, spg_link); + atomic_inc(&spg->spa_num); + spa_inc_usage(spa); + if (atomic_read(&spg->spa_num) == 1) + atomic_inc(&spg->use_count); +} + +/* + * The caller must hold spg->rw_lock. + * Return true to indicate that ths spa_num in the spg reaches zero and the caller + * should drop the extra spg->use_count added in sp_group_insert_area(). + */ +static bool sp_group_delete_area(struct sp_group *spg, struct sp_area *spa) +{ + rb_erase(&spa->spg_link, &spg->spa_root); + spa_dec_usage(spa); + return atomic_dec_and_test(&spa->spg->spa_num); +} + +/** + * sp_area_alloc() - Allocate a region of VA from the share pool. + * @size: the size of VA to allocate. + * @flags: how to allocate the memory. + * @spg: the share group that the memory is allocated to. + * @type: the type of the region. + * @applier: the tgid of the task which allocates the region. + * + * Return: a valid pointer for success, NULL on failure. + */ +static struct sp_area *sp_area_alloc(unsigned long size, unsigned long flags, + struct sp_group *spg, enum spa_type type, + pid_t applier, int node_id) +{ + int device_id; + struct sp_area *spa, *first, *err; + struct rb_node *n; + unsigned long vstart; + unsigned long vend; + unsigned long addr; + unsigned long size_align = ALIGN(size, PMD_SIZE); /* va aligned to 2M */ + struct sp_mapping *mapping; + + device_id = sp_flags_device_id(flags); + if (device_id < 0 || device_id >= MAX_DEVID) { + pr_err("invalid device id %d\n", device_id); + return ERR_PTR(-EINVAL); + } + + if (flags & SP_PROT_FOCUS) { + if ((flags & (SP_DVPP | SP_PROT_RO)) != SP_PROT_RO) { + pr_err("invalid sp_flags [%lx]\n", flags); + return ERR_PTR(-EINVAL); + } + mapping = spg->mapping[SP_MAPPING_RO]; + } else if (flags & SP_DVPP) { + mapping = spg->mapping[SP_MAPPING_DVPP]; + } else { + mapping = spg->mapping[SP_MAPPING_NORMAL]; + } + + if (!mapping) { + pr_err_ratelimited("non DVPP spg, id %d\n", spg->id); + return ERR_PTR(-EINVAL); + } + + vstart = mapping->start[device_id]; + vend = mapping->end[device_id]; + spa = kmalloc(sizeof(struct sp_area), GFP_KERNEL); + if (unlikely(!spa)) + return ERR_PTR(-ENOMEM); + + spin_lock(&mapping->sp_mapping_lock); + + /* + * Invalidate cache if we have more permissive parameters. + * cached_hole_size notes the largest hole noticed _below_ + * the sp_area cached in free_area_cache: if size fits + * into that hole, we want to scan from vstart to reuse + * the hole instead of allocating above free_area_cache. + * Note that sp_area_free may update free_area_cache + * without updating cached_hole_size. + */ + if (!mapping->free_area_cache || size_align < mapping->cached_hole_size || + vstart != mapping->cached_vstart) { + mapping->cached_hole_size = 0; + mapping->free_area_cache = NULL; + } + + /* record if we encounter less permissive parameters */ + mapping->cached_vstart = vstart; + + /* find starting point for our search */ + if (mapping->free_area_cache) { + first = rb_entry(mapping->free_area_cache, struct sp_area, rb_node); + addr = first->va_end; + if (addr + size_align < addr) { + err = ERR_PTR(-EOVERFLOW); + goto error; + } + } else { + addr = vstart; + if (addr + size_align < addr) { + err = ERR_PTR(-EOVERFLOW); + goto error; + } + + n = mapping->area_root.rb_node; + first = NULL; + + while (n) { + struct sp_area *tmp; + + tmp = rb_entry(n, struct sp_area, rb_node); + if (tmp->va_end >= addr) { + first = tmp; + if (tmp->va_start <= addr) + break; + n = n->rb_left; + } else + n = n->rb_right; + } + + if (!first) + goto found; + } + + /* from the starting point, traverse areas until a suitable hole is found */ + while (addr + size_align > first->va_start && addr + size_align <= vend) { + if (addr + mapping->cached_hole_size < first->va_start) + mapping->cached_hole_size = first->va_start - addr; + addr = first->va_end; + if (addr + size_align < addr) { + err = ERR_PTR(-EOVERFLOW); + goto error; + } + + n = rb_next(&first->rb_node); + if (n) + first = rb_entry(n, struct sp_area, rb_node); + else + goto found; + } + +found: + if (addr + size_align > vend) { + err = ERR_PTR(-EOVERFLOW); + goto error; + } + + spa->va_start = addr; + spa->va_end = addr + size_align; + spa->real_size = size; + spa->region_vstart = vstart; + spa->flags = flags; + spa->is_hugepage = (flags & SP_HUGEPAGE); + spa->spg = spg; + spa->spm = mapping; + spa->type = type; + spa->kva = 0; /* NULL pointer */ + spa->applier = applier; + spa->preferred_node_id = node_id; + atomic_set(&spa->use_count, 1); + + /* the link location could be saved before, to be optimized */ + spm_insert_area(mapping, spa); + mapping->free_area_cache = &spa->rb_node; + + spin_unlock(&mapping->sp_mapping_lock); + sp_group_insert_area(spg, spa); + + return spa; + +error: + spin_unlock(&mapping->sp_mapping_lock); + kfree(spa); + return err; +} + +/* + * Find a spa with key @addr from @spg and increase its use_count. + * The caller should hold spg->rw_lock + */ +static struct sp_area *sp_area_get(struct sp_group *spg, + unsigned long addr) +{ + struct rb_node *n = spg->spa_root.rb_node; + + while (n) { + struct sp_area *spa; + + spa = rb_entry(n, struct sp_area, spg_link); + if (addr < spa->va_start) { + n = n->rb_left; + } else if (addr > spa->va_start) { + n = n->rb_right; + } else { + /* a spa without any user will die soon */ + if (atomic_inc_not_zero(&spa->use_count)) + return spa; + else + return NULL; + } + } + + return NULL; +} + +/* + * Free the VA region starting from addr to the share pool + */ +static void sp_area_free(struct sp_area *spa) +{ + struct sp_mapping *spm = spa->spm; + + spin_lock(&spm->sp_mapping_lock); + if (spm->free_area_cache) { + struct sp_area *cache; + + cache = rb_entry(spm->free_area_cache, struct sp_area, rb_node); + if (spa->va_start <= cache->va_start) { + spm->free_area_cache = rb_prev(&spa->rb_node); + /* + * the new cache node may be changed to another region, + * i.e. from DVPP region to normal region + */ + if (spm->free_area_cache) { + cache = rb_entry(spm->free_area_cache, + struct sp_area, rb_node); + spm->cached_vstart = cache->region_vstart; + } + /* + * We don't try to update cached_hole_size, + * but it won't go very wrong. + */ + } + } + + rb_erase(&spa->rb_node, &spm->area_root); + spin_unlock(&spm->sp_mapping_lock); + RB_CLEAR_NODE(&spa->rb_node); + kfree(spa); +} + +static void sp_area_put_locked(struct sp_area *spa) +{ + if (atomic_dec_and_test(&spa->use_count)) { + if (sp_group_delete_area(spa->spg, spa)) + /* the caller must hold a refcount for spa->spg under spg->rw_lock */ + atomic_dec(&spa->spg->use_count); + sp_area_free(spa); + } +} + +static void sp_group_put(struct sp_group *spg) {} +static void sp_area_drop_func(struct work_struct *work) +{ + bool spa_zero; + struct sp_area *spa = container_of(work, struct sp_area, work); + struct sp_group *spg = spa->spg; + + down_write(&spg->rw_lock); + spa_zero = sp_group_delete_area(spg, spa); + up_write(&spg->rw_lock); + sp_area_free(spa); + if (spa_zero) + sp_group_put(spg); +} + +void __sp_area_drop(struct vm_area_struct *vma) +{ + struct sp_area *spa = vma->spa; + + if (!(vma->vm_flags & VM_SHARE_POOL)) + return; + + /* + * Considering a situation where task A and B are in the same spg. + * A is exiting and calling remove_vma(). Before A calls this func, + * B calls sp_free() to free the same spa. So spa maybe NULL when A + * calls this func later. + */ + if (!spa) + return; + + if (atomic_dec_and_test(&spa->use_count)) { + INIT_WORK(&spa->work, sp_area_drop_func); + schedule_work(&spa->work); + } +} + /** * mg_sp_free() - Free the memory allocated by mg_sp_alloc() or * mg_sp_alloc_nodemask(). @@ -308,8 +1244,25 @@ static int __init share_pool_init(void) if (!sp_is_enabled()) return 0;

+ sp_mapping_normal = sp_mapping_create(SP_MAPPING_NORMAL); + if (!sp_mapping_normal) + goto fail; + atomic_inc(&sp_mapping_normal->user); + + sp_mapping_ro = sp_mapping_create(SP_MAPPING_RO); + if (!sp_mapping_ro) + goto free_normal; + atomic_inc(&sp_mapping_ro->user); + proc_sharepool_init();

return 0; + +free_normal: + kfree(sp_mapping_normal); +fail: + pr_err("Ascend share pool initialization failed\n"); + static_branch_disable(&share_pool_enabled_key); + return 1; } late_initcall(share_pool_init);

ascend inclusion category: Feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8LNGH

---------------------------------------------

This function could map a user memory to kernel vmalloc space.

Signed-off-by: Wang Wensheng wangwensheng4@huawei.com --- mm/share_pool.c | 299 +++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 298 insertions(+), 1 deletion(-)

diff --git a/mm/share_pool.c b/mm/share_pool.c index d12150626496..49d9f7bfefbf 100644 --- a/mm/share_pool.c +++ b/mm/share_pool.c @@ -671,6 +671,13 @@ static void spa_dec_usage(struct sp_area *spa) atomic64_sub(spa->real_size, &sp_overall_stat.spa_total_size); } } + +static inline void check_interrupt_context(void) +{ + if (unlikely(in_interrupt())) + panic("function can't be used in interrupt context\n"); +} + /** * mp_sp_group_id_by_pid() - Get the sp_group ID array of a process. * @tgid: tgid of target process. @@ -1117,6 +1124,247 @@ void *mg_sp_make_share_k2u(unsigned long kva, unsigned long size, } EXPORT_SYMBOL_GPL(mg_sp_make_share_k2u);

+static int sp_pmd_entry(pmd_t *pmd, unsigned long addr, + unsigned long next, struct mm_walk *walk) +{ + struct page *page; + struct sp_walk_data *sp_walk_data = walk->private; + + /* + * There exist a scene in DVPP where the pagetable is huge page but its + * vma doesn't record it, something like THP. + * So we cannot make out whether it is a hugepage map until we access the + * pmd here. If mixed size of pages appear, just return an error. + */ + if (pmd_huge(*pmd)) { + if (!sp_walk_data->is_page_type_set) { + sp_walk_data->is_page_type_set = true; + sp_walk_data->is_hugepage = true; + } else if (!sp_walk_data->is_hugepage) { + return -EFAULT; + } + + /* To skip pte level walk */ + walk->action = ACTION_CONTINUE; + + page = pmd_page(*pmd); + get_page(page); + sp_walk_data->pages[sp_walk_data->page_count++] = page; + + return 0; + } + + if (!sp_walk_data->is_page_type_set) { + sp_walk_data->is_page_type_set = true; + sp_walk_data->is_hugepage = false; + } else if (sp_walk_data->is_hugepage) + return -EFAULT; + + sp_walk_data->pmd = pmd; + + return 0; +} + +static int sp_pte_entry(pte_t *pte, unsigned long addr, + unsigned long next, struct mm_walk *walk) +{ + struct page *page; + struct sp_walk_data *sp_walk_data = walk->private; + pmd_t *pmd = sp_walk_data->pmd; + +retry: + if (unlikely(!pte_present(*pte))) { + swp_entry_t entry; + spinlock_t *ptl = pte_lockptr(walk->mm, pmd); + + if (pte_none(*pte)) + goto no_page; + entry = pte_to_swp_entry(*pte); + if (!is_migration_entry(entry)) + goto no_page; + + pte_unmap_unlock(pte, ptl); + migration_entry_wait(walk->mm, pmd, addr); + pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); + goto retry; + } + + page = pte_page(*pte); + get_page(page); + sp_walk_data->pages[sp_walk_data->page_count++] = page; + return 0; + +no_page: + pr_debug("the page of addr %lx unexpectedly not in RAM\n", + (unsigned long)addr); + return -EFAULT; +} + +static int sp_test_walk(unsigned long addr, unsigned long next, + struct mm_walk *walk) +{ + /* + * FIXME: The devmm driver uses remap_pfn_range() but actually there + * are associated struct pages, so they should use vm_map_pages() or + * similar APIs. Before the driver has been converted to correct APIs + * we use this test_walk() callback so we can treat VM_PFNMAP VMAs as + * normal VMAs. + */ + return 0; +} + +static int sp_pte_hole(unsigned long start, unsigned long end, + int depth, struct mm_walk *walk) +{ + pr_debug("hole [%lx, %lx) appeared unexpectedly\n", + (unsigned long)start, (unsigned long)end); + return -EFAULT; +} + +static int sp_hugetlb_entry(pte_t *ptep, unsigned long hmask, + unsigned long addr, unsigned long next, + struct mm_walk *walk) +{ + pte_t pte = huge_ptep_get(ptep); + struct page *page = pte_page(pte); + struct sp_walk_data *sp_walk_data; + + if (unlikely(!pte_present(pte))) { + pr_debug("the page of addr %lx unexpectedly not in RAM\n", (unsigned long)addr); + return -EFAULT; + } + + sp_walk_data = walk->private; + get_page(page); + sp_walk_data->pages[sp_walk_data->page_count++] = page; + return 0; +} + +/* + * __sp_walk_page_range() - Walk page table with caller specific callbacks. + * @uva: the start VA of user memory. + * @size: the size of user memory. + * @mm: mm struct of the target task. + * @sp_walk_data: a structure of a page pointer array. + * + * the caller must hold mm->mmap_lock + * + * Notes for parameter alignment: + * When size == 0, let it be page_size, so that at least one page is walked. + * + * When size > 0, for convenience, usually the parameters of uva and + * size are not page aligned. There are four different alignment scenarios and + * we must handler all of them correctly. + * + * The basic idea is to align down uva and align up size so all the pages + * in range [uva, uva + size) are walked. However, there are special cases. + * + * Considering a 2M-hugepage addr scenario. Assuming the caller wants to + * traverse range [1001M, 1004.5M), so uva and size is 1001M and 3.5M + * accordingly. The aligned-down uva is 1000M and the aligned-up size is 4M. + * The traverse range will be [1000M, 1004M). Obviously, the final page for + * [1004M, 1004.5M) is not covered. + * + * To fix this problem, we need to walk an additional page, size should be + * ALIGN(uva+size) - uva_aligned + */ +static int __sp_walk_page_range(unsigned long uva, unsigned long size, + struct mm_struct *mm, struct sp_walk_data *sp_walk_data) +{ + int ret = 0; + struct vm_area_struct *vma; + unsigned long page_nr; + struct page **pages = NULL; + bool is_hugepage = false; + unsigned long uva_aligned; + unsigned long size_aligned; + unsigned int page_size = PAGE_SIZE; + struct mm_walk_ops sp_walk = {}; + + /* + * Here we also support non share pool memory in this interface + * because the caller can't distinguish whether a uva is from the + * share pool or not. It is not the best idea to do so, but currently + * it simplifies overall design. + * + * In this situation, the correctness of the parameters is mainly + * guaranteed by the caller. + */ + vma = find_vma(mm, uva); + if (!vma) { + pr_debug("u2k input uva %lx is invalid\n", (unsigned long)uva); + return -EINVAL; + } + if (is_vm_hugetlb_page(vma)) + is_hugepage = true; + + sp_walk.pte_hole = sp_pte_hole; + sp_walk.test_walk = sp_test_walk; + if (is_hugepage) { + sp_walk_data->is_hugepage = true; + sp_walk.hugetlb_entry = sp_hugetlb_entry; + page_size = PMD_SIZE; + } else { + sp_walk_data->is_hugepage = false; + sp_walk.pte_entry = sp_pte_entry; + sp_walk.pmd_entry = sp_pmd_entry; + } + + sp_walk_data->is_page_type_set = false; + sp_walk_data->page_count = 0; + sp_walk_data->page_size = page_size; + uva_aligned = ALIGN_DOWN(uva, page_size); + sp_walk_data->uva_aligned = uva_aligned; + if (size == 0) + size_aligned = page_size; + else + /* special alignment handling */ + size_aligned = ALIGN(uva + size, page_size) - uva_aligned; + + if (uva_aligned + size_aligned < uva_aligned) { + pr_err_ratelimited("overflow happened in walk page range\n"); + return -EINVAL; + } + + page_nr = size_aligned / page_size; + pages = kvmalloc_array(page_nr, sizeof(struct page *), GFP_KERNEL); + if (!pages) { + pr_err_ratelimited("alloc page array failed in walk page range\n"); + return -ENOMEM; + } + sp_walk_data->pages = pages; + + ret = walk_page_range(mm, uva_aligned, uva_aligned + size_aligned, + &sp_walk, sp_walk_data); + if (ret) { + while (sp_walk_data->page_count--) + put_page(pages[sp_walk_data->page_count]); + kvfree(pages); + sp_walk_data->pages = NULL; + } + + if (sp_walk_data->is_hugepage) + sp_walk_data->uva_aligned = ALIGN_DOWN(uva, PMD_SIZE); + + return ret; +} + +static void __sp_walk_page_free(struct sp_walk_data *data) +{ + int i = 0; + struct page *page; + + while (i < data->page_count) { + page = data->pages[i++]; + put_page(page); + } + + kvfree(data->pages); + /* prevent repeated release */ + data->page_count = 0; + data->pages = NULL; +} + /** * mg_sp_make_share_u2k() - Share user memory of a specified process to kernel. * @uva: the VA of shared user memory @@ -1129,7 +1377,56 @@ EXPORT_SYMBOL_GPL(mg_sp_make_share_k2u); */ void *mg_sp_make_share_u2k(unsigned long uva, unsigned long size, int tgid) { - return ERR_PTR(-EOPNOTSUPP); + int ret = 0; + struct mm_struct *mm = current->mm; + void *p = ERR_PTR(-ESRCH); + struct sp_walk_data sp_walk_data; + struct vm_struct *area; + + if (!sp_is_enabled()) + return ERR_PTR(-EOPNOTSUPP); + + check_interrupt_context(); + + if (mm == NULL) { + pr_err("u2k: kthread is not allowed\n"); + return ERR_PTR(-EPERM); + } + + mmap_write_lock(mm); + ret = __sp_walk_page_range(uva, size, mm, &sp_walk_data); + if (ret) { + pr_err_ratelimited("walk page range failed %d\n", ret); + mmap_write_unlock(mm); + return ERR_PTR(ret); + } + + if (sp_walk_data.is_hugepage) + p = vmap_hugepage(sp_walk_data.pages, sp_walk_data.page_count, + VM_MAP, PAGE_KERNEL); + else + p = vmap(sp_walk_data.pages, sp_walk_data.page_count, VM_MAP, + PAGE_KERNEL); + mmap_write_unlock(mm); + + if (!p) { + pr_err("vmap(huge) in u2k failed\n"); + __sp_walk_page_free(&sp_walk_data); + return ERR_PTR(-ENOMEM); + } + + p = p + (uva - sp_walk_data.uva_aligned); + + /* + * kva p may be used later in k2u. Since p comes from uva originally, + * it's reasonable to add flag VM_USERMAP so that p can be remapped + * into userspace again. + */ + area = find_vm_area(p); + area->flags |= VM_USERMAP; + + kvfree(sp_walk_data.pages); + return p; } EXPORT_SYMBOL_GPL(mg_sp_make_share_u2k);

ascend inclusion category: Feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8LNGH

---------------------------------------------

This is a simple wrap of walk_page_range() to get all the pages of a spa. It doesn't support holes.

Signed-off-by: Wang Wensheng wangwensheng4@huawei.com --- mm/share_pool.c | 40 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/mm/share_pool.c b/mm/share_pool.c index ce96ce8d3c80..cb3828ec325c 100644 --- a/mm/share_pool.c +++ b/mm/share_pool.c @@ -1555,7 +1555,36 @@ EXPORT_SYMBOL_GPL(mg_sp_unshare); int mg_sp_walk_page_range(unsigned long uva, unsigned long size, struct task_struct *tsk, struct sp_walk_data *sp_walk_data) { - return -EOPNOTSUPP; + struct mm_struct *mm; + int ret = 0; + + if (!sp_is_enabled()) + return -EOPNOTSUPP; + + check_interrupt_context(); + + if (unlikely(!sp_walk_data)) { + pr_err_ratelimited("null pointer when walk page range\n"); + return -EINVAL; + } + if (!tsk || (tsk->flags & PF_EXITING)) + return -ESRCH; + + get_task_struct(tsk); + mm = get_task_mm(tsk); + if (!mm) { + put_task_struct(tsk); + return -ESRCH; + } + + mmap_write_lock(mm); + ret = __sp_walk_page_range(uva, size, mm, sp_walk_data); + mmap_write_unlock(mm); + + mmput(mm); + put_task_struct(tsk); + + return ret; } EXPORT_SYMBOL_GPL(mg_sp_walk_page_range);

@@ -1565,6 +1594,15 @@ EXPORT_SYMBOL_GPL(mg_sp_walk_page_range); */ void mg_sp_walk_page_free(struct sp_walk_data *sp_walk_data) { + if (!sp_is_enabled()) + return; + + check_interrupt_context(); + + if (!sp_walk_data) + return; + + __sp_walk_page_free(sp_walk_data); } EXPORT_SYMBOL_GPL(mg_sp_walk_page_free);

ascend inclusion category: Feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8LNGH

---------------------------------------------

Alloc share memory for tasks in a share pool group. The tasks in the same pool could access the memory with the same virtual address.

When the user calling mg_sp_alloc(), the physical memory is allocated in do_mm_populate() for the first process and the pages are charged into the memcg of that process. We should start at the current process so as to charge the pages to the memcg of current process.

Signed-off-by: Wang Wensheng wangwensheng4@huawei.com --- mm/share_pool.c | 359 +++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 357 insertions(+), 2 deletions(-)

diff --git a/mm/share_pool.c b/mm/share_pool.c index f05b0f3a8067..50343077d0b1 100644 --- a/mm/share_pool.c +++ b/mm/share_pool.c @@ -484,6 +484,11 @@ static inline bool is_local_group(int spg_id) return spg_id >= SPG_ID_LOCAL_MIN && spg_id <= SPG_ID_LOCAL_MAX; }

+static int sp_init_group_master(struct task_struct *tsk, struct mm_struct *mm) +{ + return -EOPNOTSUPP; +} + static void update_mem_usage_alloc(unsigned long size, bool inc, bool is_hugepage, struct sp_group_node *spg_node) { @@ -694,6 +699,16 @@ static inline void check_interrupt_context(void) panic("function can't be used in interrupt context\n"); }

+struct sp_alloc_context { + unsigned long size; + unsigned long size_aligned; + unsigned long sp_flags; + nodemask_t *nodemask; + int preferred_node_id; + bool have_mbind; + enum spa_type type; +}; + /* * Get the sp_group from the mm and return the associated sp_group_node. * The caller should promise the @mm would not be deleted from the @spg. @@ -753,6 +768,11 @@ int mg_sp_group_id_by_pid(int tgid, int *spg_ids, int *num) } EXPORT_SYMBOL_GPL(mg_sp_group_id_by_pid);

+static bool is_online_node_id(int node_id) +{ + return node_id >= 0 && node_id < MAX_NUMNODES && node_online(node_id); +} + /** * mg_sp_group_add_task() - Add a process to an share group (sp_group). * @tgid: the tgid of the task to be added. @@ -1260,10 +1280,345 @@ static void __init proc_sharepool_init(void) return; }

+/* wrapper of __do_mmap() and the caller must hold mmap_write_lock(mm). */ +static unsigned long sp_mmap(struct mm_struct *mm, struct file *file, + struct sp_area *spa, unsigned long *populate, + unsigned long prot) +{ + unsigned long addr = spa->va_start; + unsigned long size = spa_size(spa); + unsigned long flags = MAP_FIXED_NOREPLACE | MAP_SHARED | MAP_POPULATE | + MAP_SHARE_POOL; + unsigned long vm_flags = VM_NORESERVE | VM_SHARE_POOL | VM_DONTCOPY; + unsigned long pgoff = addr_offset(spa) >> PAGE_SHIFT; + struct vm_area_struct *vma; + + if (spa->flags & SP_PROT_RO) + prot &= ~PROT_WRITE; + + atomic_inc(&spa->use_count); + addr = __do_mmap_mm(mm, file, addr, size, prot, flags, vm_flags, pgoff, + populate, NULL); + if (IS_ERR_VALUE(addr)) { + atomic_dec(&spa->use_count); + pr_err("do_mmap fails %ld\n", addr); + return addr; + } + + vma = find_vma(mm, addr); + vma->spa = spa; + + if (prot & PROT_WRITE) + /* clean PTE_RDONLY flags or trigger SMMU event */ + vma->vm_page_prot = __pgprot(((~PTE_RDONLY) & vma->vm_page_prot.pgprot) | + PTE_DIRTY); + else + vm_flags_clear(vma, VM_MAYWRITE); + + return addr; +} + +static int sp_alloc_prepare(unsigned long size, unsigned long sp_flags, + int spg_id, struct sp_alloc_context *ac) +{ + int device_id, node_id; + + if (!sp_is_enabled()) + return -EOPNOTSUPP; + + check_interrupt_context(); + + device_id = sp_flags_device_id(sp_flags); + node_id = sp_flags & SP_SPEC_NODE_ID ? sp_flags_node_id(sp_flags) : device_id; + if (!is_online_node_id(node_id)) { + pr_err_ratelimited("invalid numa node id %d\n", node_id); + return -EINVAL; + } + ac->preferred_node_id = node_id; + + if (current->flags & PF_KTHREAD) { + pr_err_ratelimited("allocation failed, task is kthread\n"); + return -EINVAL; + } + + if (unlikely(!size || (size >> PAGE_SHIFT) > totalram_pages())) { + pr_err_ratelimited("allocation failed, invalid size %lu\n", size); + return -EINVAL; + } + + if (spg_id != SPG_ID_DEFAULT && (spg_id < SPG_ID_MIN || spg_id >= SPG_ID_AUTO)) { + pr_err_ratelimited("allocation failed, invalid group id %d\n", spg_id); + return -EINVAL; + } + + if (sp_flags & (~SP_FLAG_MASK)) { + pr_err_ratelimited("allocation failed, invalid flag %lx\n", sp_flags); + return -EINVAL; + } + + if (sp_flags & SP_HUGEPAGE_ONLY) + sp_flags |= SP_HUGEPAGE; + + if (spg_id == SPG_ID_DEFAULT) { + /* + * We should first init the group_master in pass through scene and + * don't free it until we release the mm_struct. + */ + int ret = sp_init_group_master(current, current->mm); + + if (ret) { + pr_err("sp_alloc init local mapping failed %d\n", ret); + return ret; + } + } + + ac->type = SPA_TYPE_ALLOC; + ac->size = size; + ac->sp_flags = sp_flags; + ac->have_mbind = false; + ac->size_aligned = (sp_flags & SP_HUGEPAGE) ? ALIGN(size, PMD_SIZE) : + ALIGN(size, PAGE_SIZE); + + return 0; +} + +static bool sp_alloc_fallback(struct sp_area *spa, struct sp_alloc_context *ac) +{ + /* + * If hugepage allocation fails, this will transfer to normal page + * and try again. (only if SP_HUGEPAGE_ONLY is not flagged + */ + if (!(ac->sp_flags & SP_HUGEPAGE) || (ac->sp_flags & SP_HUGEPAGE_ONLY)) + return false; + + ac->size_aligned = ALIGN(ac->size, PAGE_SIZE); + ac->sp_flags &= ~SP_HUGEPAGE; + /* + * The mempolicy for shared memory is located at backend file, which varies + * between normal pages and huge pages. So we should set the mbind policy again + * when we retry using normal pages. + */ + ac->have_mbind = false; + sp_area_put_locked(spa); + return true; +} + +static long sp_mbind(struct mm_struct *mm, unsigned long start, unsigned long len, + nodemask_t *nodemask) +{ + return __do_mbind(start, len, MPOL_BIND, MPOL_F_STATIC_NODES, + nodemask, MPOL_MF_STRICT, mm); +} + +static int sp_alloc_populate(struct mm_struct *mm, struct sp_area *spa, + unsigned long populate, struct sp_alloc_context *ac) +{ + int ret; + + if (ac && !ac->have_mbind) { + ret = sp_mbind(mm, spa->va_start, spa->real_size, ac->nodemask); + if (ret < 0) { + pr_err("cannot bind the memory range to node[%*pbl], err:%d\n", + nodemask_pr_args(ac->nodemask), ret); + return ret; + } + ac->have_mbind = true; + } + + /* + * We are not ignoring errors, so if we fail to allocate + * physical memory we just return failure, so we won't encounter + * page fault later on, and more importantly sp_make_share_u2k() + * depends on this feature (and MAP_LOCKED) to work correctly. + */ + ret = do_mm_populate(mm, spa->va_start, populate, 0); + if (ac && (ac->sp_flags & SP_HUGEPAGE) && unlikely(ret == -EFAULT)) + ret = -ENOMEM; + if (ret) { + if (unlikely(fatal_signal_pending(current))) + pr_warn("allocation failed, current thread is killed\n"); + else + pr_warn("allocation failed due to mm populate failed(potential no enough memory when -12): %d\n", + ret); + } + + return ret; +} + +static int sp_k2u_populate(struct mm_struct *mm, struct sp_area *spa) +{ + return -EOPNOTSUPP; +} + +#define SP_SKIP_ERR 1 +/* + * The caller should increase the refcnt of the spa to prevent that we map + * a dead spa into a mm_struct. + */ +static int sp_map_spa_to_mm(struct mm_struct *mm, struct sp_area *spa, + unsigned long prot, struct sp_alloc_context *ac, + const char *str) +{ + int ret; + unsigned long mmap_addr; + unsigned long populate = 0; + + mmap_write_lock(mm); + if (unlikely(!mmget_not_zero(mm))) { + mmap_write_unlock(mm); + pr_warn("sp_map: target mm is exiting\n"); + return SP_SKIP_ERR; + } + + /* when success, mmap_addr == spa->va_start */ + mmap_addr = sp_mmap(mm, spa_file(spa), spa, &populate, prot); + if (IS_ERR_VALUE(mmap_addr)) { + mmap_write_unlock(mm); + mmput_async(mm); + pr_err("%s, sp mmap failed %ld\n", str, mmap_addr); + return (int)mmap_addr; + } + + if (spa->type == SPA_TYPE_ALLOC) { + mmap_write_unlock(mm); + ret = sp_alloc_populate(mm, spa, populate, ac); + if (ret) { + mmap_write_lock(mm); + do_munmap(mm, mmap_addr, spa_size(spa), NULL); + mmap_write_unlock(mm); + } + } else { + ret = sp_k2u_populate(mm, spa); + if (ret) { + do_munmap(mm, mmap_addr, spa_size(spa), NULL); + pr_info("k2u populate failed, %d\n", ret); + } + mmap_write_unlock(mm); + } + mmput_async(mm); + + return ret; +} + +static int sp_alloc_mmap_populate(struct sp_area *spa, struct sp_alloc_context *ac, + struct sp_group_node *spg_node) +{ + int ret = 0; + int mmap_ret = 0; + struct mm_struct *mm; + bool reach_current = false; + + mmap_ret = sp_map_spa_to_mm(current->mm, spa, spg_node->prot, ac, "sp_alloc"); + if (mmap_ret) { + /* Don't skip error for current process */ + mmap_ret = (mmap_ret == SP_SKIP_ERR) ? -EINVAL : mmap_ret; + goto fallocate; + } + + /* create mapping for each process in the group */ + list_for_each_entry(spg_node, &spa->spg->proc_head, proc_node) { + mm = spg_node->master->mm; + if (mm == current->mm) { + reach_current = true; + continue; + } + mmap_ret = sp_map_spa_to_mm(mm, spa, spg_node->prot, ac, "sp_alloc"); + if (mmap_ret) { + /* + * Goto fallback procedure upon ERR_VALUE, + * but skip the coredump situation, + * because we don't want one misbehaving process to affect others. + */ + if (mmap_ret != SP_SKIP_ERR) + goto unmap; + + continue; + } + ret = mmap_ret; + } + + return ret; + +unmap: + __sp_free(spa, mm); + if (!reach_current) + sp_munmap(current->mm, spa->va_start, spa_size(spa)); +fallocate: + /* + * Sometimes do_mm_populate() allocates some memory and then failed to + * allocate more. (e.g. memory use reaches cgroup limit.) + * In this case, it will return enomem, but will not free the + * memory which has already been allocated. + * + * So if sp_map_spa_to_mm fails, always call sp_fallocate() + * to make sure backup physical memory of the shared file is freed. + */ + sp_fallocate(spa); + + return mmap_ret; +} + +void *__mg_sp_alloc_nodemask(unsigned long size, unsigned long sp_flags, int spg_id, + nodemask_t *nodemask) +{ + int ret = 0; + struct sp_area *spa; + struct sp_group *spg; + nodemask_t __nodemask; + struct sp_alloc_context ac; + struct sp_group_node *spg_node; + + ret = sp_alloc_prepare(size, sp_flags, spg_id, &ac); + if (ret) + return ERR_PTR(ret); + + if (!nodemask) { /* mg_sp_alloc */ + nodes_clear(__nodemask); + node_set(ac.preferred_node_id, __nodemask); + ac.nodemask = &__nodemask; + } else /* mg_sp_alloc_nodemask */ + ac.nodemask = nodemask; + + spg = sp_group_get_from_mm(current->mm, spg_id, &spg_node); + if (!spg) { + pr_err("allocation failed, can't find group(%d)\n", spg_id); + return ERR_PTR(-ENODEV); + } + + down_write(&spg->rw_lock); +try_again: + spa = sp_area_alloc(ac.size_aligned, ac.sp_flags, spg, + ac.type, current->tgid, ac.preferred_node_id); + if (IS_ERR(spa)) { + up_write(&spg->rw_lock); + pr_err("alloc spa failed in allocation(potential no enough virtual memory when -75): %ld\n", + PTR_ERR(spa)); + ret = PTR_ERR(spa); + goto out; + } + + ret = sp_alloc_mmap_populate(spa, &ac, spg_node); + if (ret == -ENOMEM && sp_alloc_fallback(spa, &ac)) + goto try_again; + + if (!ret) + update_mem_usage(spa_size(spa), true, spa->is_hugepage, spg_node, spa->type); + + sp_area_put_locked(spa); + up_write(&spg->rw_lock); + +out: + sp_group_put(spg); + if (ret) + return ERR_PTR(ret); + else + return (void *)(spa->va_start); +} + void *mg_sp_alloc_nodemask(unsigned long size, unsigned long sp_flags, int spg_id, nodemask_t nodemask) { - return ERR_PTR(-EOPNOTSUPP); + return __mg_sp_alloc_nodemask(size, sp_flags, spg_id, &nodemask); } EXPORT_SYMBOL_GPL(mg_sp_alloc_nodemask);

@@ -1281,7 +1636,7 @@ EXPORT_SYMBOL_GPL(mg_sp_alloc_nodemask); */ void *mg_sp_alloc(unsigned long size, unsigned long sp_flags, int spg_id) { - return ERR_PTR(-EOPNOTSUPP); + return __mg_sp_alloc_nodemask(size, sp_flags, spg_id, NULL); } EXPORT_SYMBOL_GPL(mg_sp_alloc);

ascend inclusion category: Feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8LNGH

---------------------------------------------

Add tasks to share pool group. The share memory regions alloced before are mapped to the new joiner too.

Signed-off-by: Wang Wensheng wangwensheng4@huawei.com --- mm/share_pool.c | 452 +++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 450 insertions(+), 2 deletions(-)

diff --git a/mm/share_pool.c b/mm/share_pool.c index 6c1fd2f06d06..c10c6091115c 100644 --- a/mm/share_pool.c +++ b/mm/share_pool.c @@ -479,11 +479,34 @@ static int sp_group_setup_mapping_normal(struct mm_struct *mm, struct sp_group * return 0; }

+static int sp_group_setup_mapping_local(struct mm_struct *mm, struct sp_group *local) +{ + struct sp_mapping *spm; + + spm = sp_mapping_create(SP_MAPPING_DVPP); + if (!spm) + return -ENOMEM; + + sp_mapping_attach(local, spm); + sp_mapping_attach(local, sp_mapping_normal); + sp_mapping_attach(local, sp_mapping_ro); + + return 0; +} + static inline bool is_local_group(int spg_id) { return spg_id >= SPG_ID_LOCAL_MIN && spg_id <= SPG_ID_LOCAL_MAX; }

+static int sp_group_setup_mapping(struct mm_struct *mm, struct sp_group *spg) +{ + if (is_local_group(spg->id)) + return sp_group_setup_mapping_local(mm, spg); + else + return sp_group_setup_mapping_normal(mm, spg); +} + static int sp_init_group_master(struct task_struct *tsk, struct mm_struct *mm) { return -EOPNOTSUPP; @@ -709,6 +732,10 @@ struct sp_alloc_context { enum spa_type type; };

+static int sp_map_spa_to_mm(struct mm_struct *mm, struct sp_area *spa, + unsigned long prot, struct sp_alloc_context *ac, + const char *str); + struct sp_k2u_context { unsigned long kva; unsigned long kva_aligned; @@ -718,6 +745,82 @@ struct sp_k2u_context { enum spa_type type; };

+static void free_sp_group_locked(struct sp_group *spg) +{ + int type; + + fput(spg->file); + fput(spg->file_hugetlb); + idr_remove(&sp_group_idr, spg->id); + + for (type = SP_MAPPING_START; type < SP_MAPPING_END; type++) + sp_mapping_detach(spg, spg->mapping[type]); + + if (!is_local_group(spg->id)) + system_group_count--; + + kfree(spg); + WARN(system_group_count < 0, "unexpected group count\n"); +} + +static void free_sp_group(struct sp_group *spg) +{ + down_write(&sp_global_sem); + free_sp_group_locked(spg); + up_write(&sp_global_sem); +} + +static void sp_group_put_locked(struct sp_group *spg) +{ + lockdep_assert_held_write(&sp_global_sem); + + if (atomic_dec_and_test(&spg->use_count)) + free_sp_group_locked(spg); +} + +static void sp_group_put(struct sp_group *spg) +{ + if (atomic_dec_and_test(&spg->use_count)) + free_sp_group(spg); +} + +/* use with put_task_struct(task) */ +static int get_task(int tgid, struct task_struct **task) +{ + struct task_struct *tsk; + struct pid *p; + + rcu_read_lock(); + p = find_pid_ns(tgid, &init_pid_ns); + tsk = pid_task(p, PIDTYPE_TGID); + if (!tsk || (tsk->flags & PF_EXITING)) { + rcu_read_unlock(); + return -ESRCH; + } + get_task_struct(tsk); + rcu_read_unlock(); + + *task = tsk; + return 0; +} + +/* + * the caller must: + * 1. hold spg->rw_lock + * 2. ensure no concurrency problem for mm_struct + */ +static bool is_process_in_group(struct sp_group *spg, + struct mm_struct *mm) +{ + struct sp_group_node *spg_node; + + list_for_each_entry(spg_node, &spg->proc_head, proc_node) + if (spg_node->master->mm == mm) + return true; + + return false; +} + /* * Get the sp_group from the mm and return the associated sp_group_node. * The caller should promise the @mm would not be deleted from the @spg. @@ -782,6 +885,270 @@ static bool is_online_node_id(int node_id) return node_id >= 0 && node_id < MAX_NUMNODES && node_online(node_id); }

+static void sp_group_init(struct sp_group *spg, int spg_id) +{ + spg->id = spg_id; + spg->proc_num = 0; + spg->spa_root = RB_ROOT; + atomic_set(&spg->use_count, 1); + atomic_set(&spg->spa_num, 0); + INIT_LIST_HEAD(&spg->proc_head); + INIT_LIST_HEAD(&spg->mnode); + init_rwsem(&spg->rw_lock); + meminfo_init(&spg->meminfo); +} + +/* + * sp_group_create - create a new sp_group + * @spg_id: specify the id for the new sp_group + * + * valid @spg_id: + * SPG_ID_AUTO: + * Allocate a id in range [SPG_ID_AUTO_MIN, APG_ID_AUTO_MAX] + * SPG_ID_LOCAL: + * Allocate a id in range [SPG_ID_LOCAL_MIN, APG_ID_LOCAL_MAX] + * [SPG_ID_MIN, SPG_ID_MAX]: + * Using the input @spg_id for the new sp_group. + * + * Return: the newly created sp_group or an errno. + * Context: The caller should protect sp_group_idr from being access. + */ +static struct sp_group *sp_group_create(int spg_id) +{ + int ret, start, end; + struct sp_group *spg; + char name[DNAME_INLINE_LEN]; + int hsize_log = MAP_HUGE_2MB >> MAP_HUGE_SHIFT; + + if (unlikely(system_group_count + 1 == MAX_GROUP_FOR_SYSTEM && + spg_id != SPG_ID_LOCAL)) { + pr_err("reach system max group num\n"); + return ERR_PTR(-ENOSPC); + } + + if (spg_id == SPG_ID_LOCAL) { + start = SPG_ID_LOCAL_MIN; + end = SPG_ID_LOCAL_MAX + 1; + } else if (spg_id == SPG_ID_AUTO) { + start = SPG_ID_AUTO_MIN; + end = SPG_ID_AUTO_MAX + 1; + } else if (spg_id >= SPG_ID_MIN && spg_id <= SPG_ID_MAX) { + start = spg_id; + end = spg_id + 1; + } else { + pr_err("invalid input spg_id:%d\n", spg_id); + return ERR_PTR(-EINVAL); + } + + spg = kzalloc(sizeof(*spg), GFP_KERNEL); + if (spg == NULL) + return ERR_PTR(-ENOMEM); + + ret = idr_alloc(&sp_group_idr, spg, start, end, GFP_KERNEL); + if (ret < 0) { + pr_err("group %d idr alloc failed %d\n", spg_id, ret); + goto out_kfree; + } + spg_id = ret; + + sprintf(name, "sp_group_%d", spg_id); + spg->file = shmem_kernel_file_setup(name, MAX_LFS_FILESIZE, VM_NORESERVE); + if (IS_ERR(spg->file)) { + pr_err("spg file setup failed %ld\n", PTR_ERR(spg->file)); + ret = PTR_ERR(spg->file); + goto out_idr_remove; + } + + sprintf(name, "sp_group_%d_huge", spg_id); + spg->file_hugetlb = hugetlb_file_setup(name, MAX_LFS_FILESIZE, + VM_NORESERVE, HUGETLB_ANONHUGE_INODE, hsize_log); + if (IS_ERR(spg->file_hugetlb)) { + pr_err("spg file_hugetlb setup failed %ld\n", PTR_ERR(spg->file_hugetlb)); + ret = PTR_ERR(spg->file_hugetlb); + goto out_fput; + } + + sp_group_init(spg, spg_id); + + if (!is_local_group(spg_id)) + system_group_count++; + + return spg; + +out_fput: + fput(spg->file); +out_idr_remove: + idr_remove(&sp_group_idr, spg_id); +out_kfree: + kfree(spg); + return ERR_PTR(ret); +} + +/* the caller must hold sp_global_sem */ +static struct sp_group *sp_group_get_or_alloc(int spg_id) +{ + struct sp_group *spg; + + spg = idr_find(&sp_group_idr, spg_id); + if (!spg || !atomic_inc_not_zero(&spg->use_count)) + spg = sp_group_create(spg_id); + + return spg; +} + +/* the caller must hold sp_global_sem */ +static struct sp_group_node *spg_node_alloc(struct mm_struct *mm, + unsigned long prot, struct sp_group *spg) +{ + struct sp_group_master *master = mm->sp_group_master; + struct sp_group_node *spg_node; + + spg_node = kzalloc(sizeof(struct sp_group_node), GFP_KERNEL); + if (!spg_node) + return NULL; + + INIT_LIST_HEAD(&spg_node->group_node); + INIT_LIST_HEAD(&spg_node->proc_node); + spg_node->spg = spg; + spg_node->master = master; + spg_node->prot = prot; + meminfo_init(&spg_node->meminfo); + + return spg_node; +} + +/* + * sp_group_link_task - Actually add a task into a group + * @mm: specify the input task + * @spg: the sp_group + * @prot: read/write protection for the task in the group + * + * The input @mm and @spg must have been initialized properly and could not + * be freed during the sp_group_link_task(). + * the caller must hold sp_global_sem. + */ +static int sp_group_link_task(struct mm_struct *mm, struct sp_group *spg, + unsigned long prot, struct sp_group_node **pnode) +{ + int ret; + struct sp_group_node *node; + struct sp_group_master *master = mm->sp_group_master; + + if (master->group_num == MAX_GROUP_FOR_TASK) { + pr_err("task reaches max group num\n"); + return -ENOSPC; + } + + if (is_process_in_group(spg, mm)) { + pr_err("task already in target group(%d)\n", spg->id); + return -EEXIST; + } + + if (spg->proc_num + 1 == MAX_PROC_PER_GROUP) { + pr_err("add group: group(%d) reaches max process num\n", spg->id); + return -ENOSPC; + } + + node = spg_node_alloc(mm, prot, spg); + if (!node) + return -ENOMEM; + + ret = sp_group_setup_mapping(mm, spg); + if (ret) + goto out_kfree; + + /* + * We pin only the mm_struct instead of the memory space of the target mm. + * So we must ensure the existence of the memory space via mmget_not_zero + * before we would access it. + */ + mmgrab(mm); + master->group_num++; + list_add_tail(&node->group_node, &master->group_head); + atomic_inc(&spg->use_count); + spg->proc_num++; + list_add_tail(&node->proc_node, &spg->proc_head); + if (pnode) + *pnode = node; + + return 0; + +out_kfree: + kfree(node); + + return ret; +} + +static void sp_group_unlink_task(struct sp_group_node *spg_node) +{ + struct sp_group *spg = spg_node->spg; + struct sp_group_master *master = spg_node->master; + + list_del(&spg_node->proc_node); + spg->proc_num--; + list_del(&spg_node->group_node); + master->group_num--; + + mmdrop(master->mm); + sp_group_put_locked(spg); + kfree(spg_node); +} + +/* + * Find and initialize the mm of the task specified by @tgid. + * We increace the usercount for the mm on success. + */ +static int mm_add_group_init(pid_t tgid, struct mm_struct **pmm) +{ + int ret; + struct mm_struct *mm; + struct task_struct *tsk; + + ret = get_task(tgid, &tsk); + if (ret) + return ret; + + /* + * group_leader: current thread may be exiting in a multithread process + * + * DESIGN IDEA + * We increase mm->mm_users deliberately to ensure it's decreased in + * share pool under only 2 circumstances, which will simply the overall + * design as mm won't be freed unexpectedly. + * + * The corresponding refcount decrements are as follows: + * 1. the error handling branch of THIS function. + * 2. In sp_group_exit(). It's called only when process is exiting. + */ + mm = get_task_mm(tsk->group_leader); + if (!mm) { + ret = -ESRCH; + goto out_put_task; + } + + ret = sp_init_group_master(tsk, mm); + if (ret) + goto out_put_mm; + + if (mm->sp_group_master && mm->sp_group_master->tgid != tgid) { + pr_err("add: task(%d) is a vfork child of the original task(%d)\n", + tgid, mm->sp_group_master->tgid); + ret = -EINVAL; + goto out_put_mm; + } + *pmm = mm; + +out_put_mm: + if (ret) + mmput(mm); +out_put_task: + put_task_struct(tsk); + + return ret; +} + +static void sp_area_put_locked(struct sp_area *spa); +static void sp_munmap(struct mm_struct *mm, unsigned long addr, unsigned long size); /** * mg_sp_group_add_task() - Add a process to an share group (sp_group). * @tgid: the tgid of the task to be added. @@ -810,7 +1177,89 @@ static bool is_online_node_id(int node_id) */ int mg_sp_group_add_task(int tgid, unsigned long prot, int spg_id) { - return -EOPNOTSUPP; + int ret = 0; + struct sp_area *spa; + struct mm_struct *mm; + struct sp_group *spg; + struct rb_node *p, *n; + struct sp_group_node *spg_node; + + if (!sp_is_enabled()) + return -EOPNOTSUPP; + + check_interrupt_context(); + + /* only allow READ, READ | WRITE */ + if (!((prot == PROT_READ) || (prot == (PROT_READ | PROT_WRITE)))) { + pr_err_ratelimited("prot is invalid 0x%lx\n", prot); + return -EINVAL; + } + + if (spg_id < SPG_ID_MIN || spg_id > SPG_ID_AUTO) { + pr_err_ratelimited("add group failed, invalid group id %d\n", spg_id); + return -EINVAL; + } + + ret = mm_add_group_init(tgid, &mm); + if (ret < 0) + return ret; + + down_write(&sp_global_sem); + spg = sp_group_get_or_alloc(spg_id); + if (IS_ERR(spg)) { + ret = PTR_ERR(spg); + goto out_unlock; + } + /* save spg_id before we release sp_global_sem, or UAF may occur */ + spg_id = spg->id; + + down_write(&spg->rw_lock); + ret = sp_group_link_task(mm, spg, prot, &spg_node); + if (ret < 0) + goto put_spg; + + /* + * create mappings of existing shared memory segments into this + * new process' page table. + */ + for (p = rb_first(&spg->spa_root); p; p = n) { + n = rb_next(p); + spa = container_of(p, struct sp_area, spg_link); + + if (!atomic_inc_not_zero(&spa->use_count)) { + pr_warn("be careful, add new task(%d) to an exiting group(%d)\n", + tgid, spg_id); + continue; + } + + ret = sp_map_spa_to_mm(mm, spa, prot, NULL, "add_task"); + sp_area_put_locked(spa); + if (ret) { + pr_warn("mmap old spa to new task failed, %d\n", ret); + /* it makes no scene to skip error for coredump here */ + ret = ret < 0 ? ret : -EFAULT; + + for (p = rb_prev(p); p; p = n) { + n = rb_prev(p); + spa = container_of(p, struct sp_area, spg_link); + if (!atomic_inc_not_zero(&spa->use_count)) + continue; + sp_munmap(mm, spa->va_start, spa_size(spa)); + sp_area_put_locked(spa); + } + sp_group_unlink_task(spg_node); + break; + } + } +put_spg: + up_write(&spg->rw_lock); + sp_group_put_locked(spg); +out_unlock: + up_write(&sp_global_sem); + /* We put the mm_struct later to protect the mm from exiting while sp_mmap */ + mmput(mm); + + return ret < 0 ? ret : spg_id; } EXPORT_SYMBOL_GPL(mg_sp_group_add_task);

@@ -1100,7 +1549,6 @@ static void sp_area_put_locked(struct sp_area *spa) } }

-static void sp_group_put(struct sp_group *spg) {} static void sp_area_drop_func(struct work_struct *work) { bool spa_zero;

ascend inclusion category: Feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8LNGH

---------------------------------------------

This is used to get the local group id of current process. When the process is exiting, the caller of sp_free/sp_unshare must supply a real spg_id instead of zero. Because the current->mm is NULL and we cannot access the spg via the mm_struct of current.

Signed-off-by: Wang Wensheng wangwensheng4@huawei.com --- mm/share_pool.c | 104 +++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 102 insertions(+), 2 deletions(-)

diff --git a/mm/share_pool.c b/mm/share_pool.c index 1465c1c0a35a..37d1fef98ec4 100644 --- a/mm/share_pool.c +++ b/mm/share_pool.c @@ -507,9 +507,81 @@ static int sp_group_setup_mapping(struct mm_struct *mm, struct sp_group *spg) return sp_group_setup_mapping_normal(mm, spg); }

+static struct sp_group *sp_group_create(int spg_id); +static void sp_group_put_locked(struct sp_group *spg); +static int sp_group_link_task(struct mm_struct *mm, struct sp_group *spg, + unsigned long prot, struct sp_group_node **pnode); +static int init_local_group(struct mm_struct *mm) +{ + int ret; + struct sp_group *spg; + struct sp_group_master *master = mm->sp_group_master; + + spg = sp_group_create(SPG_ID_LOCAL); + if (IS_ERR(spg)) + return PTR_ERR(spg); + + ret = sp_group_link_task(mm, spg, PROT_READ | PROT_WRITE, NULL); + sp_group_put_locked(spg); + if (!ret) + master->local = spg; + + return ret; +} + +/* The caller must hold sp_global_sem and the input @mm cannot be freed */ +static int sp_init_group_master_locked(struct task_struct *tsk, struct mm_struct *mm) +{ + int ret; + struct sp_group_master *master; + + if (mm->sp_group_master) + return 0; + + master = kmalloc(sizeof(struct sp_group_master), GFP_KERNEL); + if (!master) + return -ENOMEM; + + INIT_LIST_HEAD(&master->group_head); + master->group_num = 0; + master->mm = mm; + master->tgid = tsk->tgid; + get_task_comm(master->comm, current); + meminfo_init(&master->meminfo); + mm->sp_group_master = master; + sp_add_group_master(master); + + ret = init_local_group(mm); + if (ret) + goto free_master; + + return 0; + +free_master: + sp_del_group_master(master); + mm->sp_group_master = NULL; + kfree(master); + + return ret; +} + static int sp_init_group_master(struct task_struct *tsk, struct mm_struct *mm) { - return -EOPNOTSUPP; + int ret; + + down_read(&sp_global_sem); + /* The sp_group_master would never change once set */ + if (mm->sp_group_master) { + up_read(&sp_global_sem); + return 0; + } + up_read(&sp_global_sem); + + down_write(&sp_global_sem); + ret = sp_init_group_master_locked(tsk, mm); + up_write(&sp_global_sem); + + return ret; }

static void update_mem_usage_alloc(unsigned long size, bool inc, @@ -1319,7 +1391,35 @@ EXPORT_SYMBOL_GPL(mg_sp_group_add_task);

int mg_sp_id_of_current(void) { - return -EOPNOTSUPP; + int ret, spg_id; + struct sp_group_master *master; + + if (!sp_is_enabled()) + return -EOPNOTSUPP; + + if ((current->flags & PF_KTHREAD) || !current->mm) + return -EINVAL; + + down_read(&sp_global_sem); + master = current->mm->sp_group_master; + if (master) { + spg_id = master->local->id; + up_read(&sp_global_sem); + return spg_id; + } + up_read(&sp_global_sem); + + down_write(&sp_global_sem); + ret = sp_init_group_master_locked(current, current->mm); + if (ret) { + up_write(&sp_global_sem); + return ret; + } + master = current->mm->sp_group_master; + spg_id = master->local->id; + up_write(&sp_global_sem); + + return spg_id; } EXPORT_SYMBOL_GPL(mg_sp_id_of_current);

ascend inclusion category: Feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8LNGH

---------------------------------------------

/proc/sharepool/* those interfaces show the system-wide processes that are in the sharepool group and all the groups.

Signed-off-by: Wang Wensheng wangwensheng4@huawei.com --- mm/share_pool.c | 321 +++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 315 insertions(+), 6 deletions(-)

diff --git a/mm/share_pool.c b/mm/share_pool.c index a0b818fa4355..c9b75b3ca632 100644 --- a/mm/share_pool.c +++ b/mm/share_pool.c @@ -1912,12 +1912,6 @@ int mg_sp_free(unsigned long addr, int id) } EXPORT_SYMBOL_GPL(mg_sp_free);

-static void __init proc_sharepool_init(void) -{ - if (!proc_mkdir("sharepool", NULL)) - return; -} - /* wrapper of __do_mmap() and the caller must hold mmap_write_lock(mm). */ static unsigned long sp_mmap(struct mm_struct *mm, struct file *file, struct sp_area *spa, unsigned long *populate, @@ -3042,6 +3036,321 @@ bool mg_is_sharepool_addr(unsigned long addr) } EXPORT_SYMBOL_GPL(mg_is_sharepool_addr);

+/*** Statistical and maintenance functions ***/ + +static void get_mm_rss_info(struct mm_struct *mm, unsigned long *anon, + unsigned long *file, unsigned long *shmem, unsigned long *total_rss) +{ + *anon = get_mm_counter(mm, MM_ANONPAGES); + *file = get_mm_counter(mm, MM_FILEPAGES); + *shmem = get_mm_counter(mm, MM_SHMEMPAGES); + *total_rss = *anon + *file + *shmem; +} + +static void get_process_sp_res(struct sp_group_master *master, + long *sp_res_out, long *sp_res_nsize_out) +{ + struct sp_group *spg; + struct sp_group_node *spg_node; + + *sp_res_out = 0; + *sp_res_nsize_out = 0; + + list_for_each_entry(spg_node, &master->group_head, group_node) { + spg = spg_node->spg; + *sp_res_out += meminfo_alloc_sum_byKB(&spg->meminfo); + *sp_res_nsize_out += byte2kb(atomic64_read(&spg->meminfo.alloc_nsize)); + } +} + +/* + * Statistics of RSS has a maximum 64 pages deviation (256KB). + * Please check_sync_rss_stat(). + */ +static void get_process_non_sp_res(unsigned long total_rss, unsigned long shmem, + long sp_res_nsize, long *non_sp_res_out, long *non_sp_shm_out) +{ + long non_sp_res, non_sp_shm; + + non_sp_res = page2kb(total_rss) - sp_res_nsize; + non_sp_res = non_sp_res < 0 ? 0 : non_sp_res; + non_sp_shm = page2kb(shmem) - sp_res_nsize; + non_sp_shm = non_sp_shm < 0 ? 0 : non_sp_shm; + + *non_sp_res_out = non_sp_res; + *non_sp_shm_out = non_sp_shm; +} + +static void print_process_prot(struct seq_file *seq, unsigned long prot) +{ + if (prot == PROT_READ) + seq_puts(seq, "R"); + else if (prot == (PROT_READ | PROT_WRITE)) + seq_puts(seq, "RW"); + else + seq_puts(seq, "-"); +} + +static void spa_stat_of_mapping_show(struct seq_file *seq, struct sp_mapping *spm) +{ + struct rb_node *node; + struct sp_area *spa; + + spin_lock(&spm->sp_mapping_lock); + for (node = rb_first(&spm->area_root); node; node = rb_next(node)) { + spa = rb_entry(node, struct sp_area, rb_node); + + seq_printf(seq, "%-10d 0x%-14lx 0x%-14lx %-10ld ", + spa->spg->id, spa->va_start, spa->va_end, byte2kb(spa->real_size)); + + switch (spa->type) { + case SPA_TYPE_ALLOC: + seq_printf(seq, "%-7s ", "ALLOC"); + break; + case SPA_TYPE_K2TASK: + seq_printf(seq, "%-7s ", "TASK"); + break; + case SPA_TYPE_K2SPG: + seq_printf(seq, "%-7s ", "SPG"); + break; + default: + /* usually impossible, perhaps a developer's mistake */ + break; + } + + if (spa->is_hugepage) + seq_printf(seq, "%-5s ", "Y"); + else + seq_printf(seq, "%-5s ", "N"); + + seq_printf(seq, "%-8d ", spa->applier); + seq_printf(seq, "%-8d\n", atomic_read(&spa->use_count)); + + } + spin_unlock(&spm->sp_mapping_lock); +} + +static void spa_ro_stat_show(struct seq_file *seq) +{ + spa_stat_of_mapping_show(seq, sp_mapping_ro); +} + +static void spa_normal_stat_show(struct seq_file *seq) +{ + spa_stat_of_mapping_show(seq, sp_mapping_normal); +} + +static void spa_dvpp_stat_show(struct seq_file *seq) +{ + struct sp_mapping *spm; + + mutex_lock(&spm_list_lock); + list_for_each_entry(spm, &spm_dvpp_list, spm_node) + spa_stat_of_mapping_show(seq, spm); + mutex_unlock(&spm_list_lock); +} + + +static void spa_overview_show(struct seq_file *seq) +{ + s64 total_num, alloc_num, k2u_task_num, k2u_spg_num; + s64 total_size, alloc_size, k2u_task_size, k2u_spg_size; + s64 dvpp_size, dvpp_va_size; + + if (!sp_is_enabled()) + return; + + alloc_num = atomic64_read(&spa_stat.alloc_num); + k2u_task_num = atomic64_read(&spa_stat.k2u_task_num); + k2u_spg_num = atomic64_read(&spa_stat.k2u_spg_num); + alloc_size = atomic64_read(&spa_stat.alloc_size); + k2u_task_size = atomic64_read(&spa_stat.k2u_task_size); + k2u_spg_size = atomic64_read(&spa_stat.k2u_spg_size); + dvpp_size = atomic64_read(&spa_stat.dvpp_size); + dvpp_va_size = atomic64_read(&spa_stat.dvpp_va_size); + total_num = alloc_num + k2u_task_num + k2u_spg_num; + total_size = alloc_size + k2u_task_size + k2u_spg_size; + + SEQ_printf(seq, "Spa total num %lld.\n", total_num); + SEQ_printf(seq, "Spa alloc num %lld, k2u(task) num %lld, k2u(spg) num %lld.\n", + alloc_num, k2u_task_num, k2u_spg_num); + SEQ_printf(seq, "Spa total size: %13lld KB\n", byte2kb(total_size)); + SEQ_printf(seq, "Spa alloc size: %13lld KB\n", byte2kb(alloc_size)); + SEQ_printf(seq, "Spa k2u(task) size: %13lld KB\n", byte2kb(k2u_task_size)); + SEQ_printf(seq, "Spa k2u(spg) size: %13lld KB\n", byte2kb(k2u_spg_size)); + SEQ_printf(seq, "Spa dvpp size: %13lld KB\n", byte2kb(dvpp_size)); + SEQ_printf(seq, "Spa dvpp va size: %13lld MB\n", byte2mb(dvpp_va_size)); + SEQ_printf(seq, "\n"); +} + +static int spg_info_show(int id, void *p, void *data) +{ + struct sp_group *spg = p; + struct seq_file *seq = data; + + if (id >= SPG_ID_LOCAL_MIN && id <= SPG_ID_LOCAL_MAX) + return 0; + + SEQ_printf(seq, "Group %6d ", id); + + down_read(&spg->rw_lock); + SEQ_printf(seq, "size: %lld KB, spa num: %d, total alloc: %ld KB, ", + byte2kb(meminfo_total_size(&spg->meminfo)), + atomic_read(&spg->spa_num), + meminfo_alloc_sum_byKB(&spg->meminfo)); + SEQ_printf(seq, "normal alloc: %lld KB, huge alloc: %lld KB\n", + byte2kb(atomic64_read(&spg->meminfo.alloc_nsize)), + byte2kb(atomic64_read(&spg->meminfo.alloc_hsize))); + up_read(&spg->rw_lock); + + return 0; +} + +static void spg_overview_show(struct seq_file *seq) +{ + if (!sp_is_enabled()) + return; + + SEQ_printf(seq, "Share pool total size: %lld KB, spa total num: %d.\n", + byte2kb(atomic64_read(&sp_overall_stat.spa_total_size)), + atomic_read(&sp_overall_stat.spa_total_num)); + + down_read(&sp_global_sem); + idr_for_each(&sp_group_idr, spg_info_show, seq); + up_read(&sp_global_sem); + + SEQ_printf(seq, "\n"); +} + +static bool should_show_statistics(void) +{ + if (!capable(CAP_SYS_ADMIN)) + return false; + + if (task_active_pid_ns(current) != &init_pid_ns) + return false; + + return true; +} + +static int spa_stat_show(struct seq_file *seq, void *offset) +{ + if (!should_show_statistics()) + return -EPERM; + + spg_overview_show(seq); + spa_overview_show(seq); + /* print the file header */ + seq_printf(seq, "%-10s %-16s %-16s %-10s %-7s %-5s %-8s %-8s\n", + "Group ID", "va_start", "va_end", "Size(KB)", "Type", "Huge", "PID", "Ref"); + spa_ro_stat_show(seq); + spa_normal_stat_show(seq); + spa_dvpp_stat_show(seq); + return 0; +} + +static int proc_usage_by_group(int id, void *p, void *data) +{ + struct sp_group *spg = p; + struct seq_file *seq = data; + struct sp_group_node *spg_node; + struct mm_struct *mm; + struct sp_group_master *master; + int tgid; + unsigned long anon, file, shmem, total_rss; + + down_read(&spg->rw_lock); + list_for_each_entry(spg_node, &spg->proc_head, proc_node) { + master = spg_node->master; + mm = master->mm; + tgid = master->tgid; + + get_mm_rss_info(mm, &anon, &file, &shmem, &total_rss); + + seq_printf(seq, "%-8d ", tgid); + seq_printf(seq, "%-8d ", id); + seq_printf(seq, "%-9ld %-9ld %-9ld %-8ld %-7ld %-7ld ", + meminfo_alloc_sum_byKB(&spg_node->meminfo), + meminfo_k2u_size(&spg_node->meminfo), + meminfo_alloc_sum_byKB(&spg_node->spg->meminfo), + page2kb(mm->total_vm), page2kb(total_rss), + page2kb(shmem)); + print_process_prot(seq, spg_node->prot); + seq_putc(seq, '\n'); + } + up_read(&spg->rw_lock); + cond_resched(); + + return 0; +} + +static int proc_group_usage_show(struct seq_file *seq, void *offset) +{ + if (!should_show_statistics()) + return -EPERM; + + spg_overview_show(seq); + spa_overview_show(seq); + + /* print the file header */ + seq_printf(seq, "%-8s %-8s %-9s %-9s %-9s %-8s %-7s %-7s %-4s\n", + "PID", "Group_ID", "SP_ALLOC", "SP_K2U", "SP_RES", + "VIRT", "RES", "Shm", "PROT"); + + down_read(&sp_global_sem); + idr_for_each(&sp_group_idr, proc_usage_by_group, seq); + up_read(&sp_global_sem); + + return 0; +} + +static int proc_usage_show(struct seq_file *seq, void *offset) +{ + struct sp_group_master *master = NULL; + unsigned long anon, file, shmem, total_rss; + long sp_res, sp_res_nsize, non_sp_res, non_sp_shm; + struct sp_meminfo *meminfo; + + if (!should_show_statistics()) + return -EPERM; + + seq_printf(seq, "%-8s %-16s %-9s %-9s %-9s %-10s %-10s %-8s\n", + "PID", "COMM", "SP_ALLOC", "SP_K2U", "SP_RES", "Non-SP_RES", + "Non-SP_Shm", "VIRT"); + + down_read(&sp_global_sem); + mutex_lock(&master_list_lock); + list_for_each_entry(master, &master_list, list_node) { + meminfo = &master->meminfo; + get_mm_rss_info(master->mm, &anon, &file, &shmem, &total_rss); + get_process_sp_res(master, &sp_res, &sp_res_nsize); + get_process_non_sp_res(total_rss, shmem, sp_res_nsize, + &non_sp_res, &non_sp_shm); + seq_printf(seq, "%-8d %-16s %-9ld %-9ld %-9ld %-10ld %-10ld %-8ld\n", + master->tgid, master->comm, + meminfo_alloc_sum_byKB(meminfo), + meminfo_k2u_size(meminfo), + sp_res, non_sp_res, non_sp_shm, + page2kb(master->mm->total_vm)); + } + mutex_unlock(&master_list_lock); + up_read(&sp_global_sem); + + return 0; +} + +static void __init proc_sharepool_init(void) +{ + if (!proc_mkdir("sharepool", NULL)) + return; + + proc_create_single_data("sharepool/spa_stat", 0400, NULL, spa_stat_show, NULL); + proc_create_single_data("sharepool/proc_stat", 0400, NULL, proc_group_usage_show, NULL); + proc_create_single_data("sharepool/proc_overview", 0400, NULL, proc_usage_show, NULL); +} + +/*** End of tatistical and maintenance functions ***/ + DEFINE_STATIC_KEY_FALSE(share_pool_enabled_key);

static int __init enable_share_pool(char *s)

ascend inclusion category: Feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8LNGH

---------------------------------------------

Add protections for the va reserved for sharepool. Forbid mremap/munmap to access that range.

Signed-off-by: Wang Wensheng wangwensheng4@huawei.com --- include/linux/share_pool.h | 27 +++++++++++++++++++++++++++ mm/mmap.c | 9 +++++++++ mm/mremap.c | 4 ++++ 3 files changed, 40 insertions(+)

diff --git a/include/linux/share_pool.h b/include/linux/share_pool.h index 87ce9eb9fa3e..bd2e0ca8f975 100644 --- a/include/linux/share_pool.h +++ b/include/linux/share_pool.h @@ -157,6 +157,23 @@ static inline void sp_init_mm(struct mm_struct *mm) mm->sp_group_master = NULL; }

+static inline bool sp_check_addr(unsigned long addr) +{ + if (sp_is_enabled() && mg_is_sharepool_addr(addr)) + return true; + else + return false; +} + +static inline bool sp_check_mmap_addr(unsigned long addr, unsigned long flags) +{ + if (sp_is_enabled() && mg_is_sharepool_addr(addr) && + !(flags & MAP_SHARE_POOL)) + return true; + else + return false; +} + #else /* CONFIG_SHARE_POOL */

static inline int mg_sp_group_add_task(int tgid, unsigned long prot, int spg_id) @@ -245,6 +262,16 @@ static inline bool sp_check_vm_share_pool(unsigned long vm_flags) { return false; } + +static inline bool sp_check_addr(unsigned long addr) +{ + return false; +} + +static inline bool sp_check_mmap_addr(unsigned long addr, unsigned long flags) +{ + return false; +} #endif /* !CONFIG_SHARE_POOL */

#endif /* LINUX_SHARE_POOL_H */ diff --git a/mm/mmap.c b/mm/mmap.c index ff9d9a8d25ce..21d1fc39bf21 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1720,6 +1720,9 @@ generic_get_unmapped_area(struct file *filp, unsigned long addr, if (len > mmap_end - mmap_min_addr) return -ENOMEM;

+ if (sp_check_mmap_addr(addr, flags)) + return -EINVAL; + if (flags & MAP_FIXED) return addr;

@@ -1769,6 +1772,9 @@ generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr, if (len > mmap_end - mmap_min_addr) return -ENOMEM;

+ if (sp_check_mmap_addr(addr, flags)) + return -EINVAL; + if (flags & MAP_FIXED) return addr;

@@ -2949,6 +2955,9 @@ static int __vm_munmap(unsigned long start, size_t len, bool unlock) LIST_HEAD(uf); VMA_ITERATOR(vmi, mm, start);

+ if (sp_check_addr(start)) + return -EINVAL; + if (mmap_write_lock_killable(mm)) return -EINTR;

diff --git a/mm/mremap.c b/mm/mremap.c index 382e81c33fc4..b6979f9d687c 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -25,6 +25,7 @@ #include <linux/uaccess.h> #include <linux/userfaultfd_k.h> #include <linux/mempolicy.h> +#include <linux/share_pool.h>

#include <asm/cacheflush.h> #include <asm/tlb.h> @@ -948,6 +949,9 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, if (offset_in_page(addr)) return ret;

+ if (sp_check_addr(addr) || sp_check_addr(new_addr)) + return ret; + old_len = PAGE_ALIGN(old_len); new_len = PAGE_ALIGN(new_len);