From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- fs/proc/task_nommu.c | 296 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 296 insertions(+) create mode 100644 fs/proc/task_nommu.c (limited to 'fs/proc/task_nommu.c') diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c new file mode 100644 index 000000000..d362919f4 --- /dev/null +++ b/fs/proc/task_nommu.c @@ -0,0 +1,296 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "internal.h" + +/* + * Logic: we've got two memory sums for each process, "shared", and + * "non-shared". Shared memory may get counted more than once, for + * each process that owns it. Non-shared memory is counted + * accurately. + */ +void task_mem(struct seq_file *m, struct mm_struct *mm) +{ + VMA_ITERATOR(vmi, mm, 0); + struct vm_area_struct *vma; + struct vm_region *region; + unsigned long bytes = 0, sbytes = 0, slack = 0, size; + + mmap_read_lock(mm); + for_each_vma(vmi, vma) { + bytes += kobjsize(vma); + + region = vma->vm_region; + if (region) { + size = kobjsize(region); + size += region->vm_end - region->vm_start; + } else { + size = vma->vm_end - vma->vm_start; + } + + if (atomic_read(&mm->mm_count) > 1 || + is_nommu_shared_mapping(vma->vm_flags)) { + sbytes += size; + } else { + bytes += size; + if (region) + slack = region->vm_end - vma->vm_end; + } + } + + if (atomic_read(&mm->mm_count) > 1) + sbytes += kobjsize(mm); + else + bytes += kobjsize(mm); + + if (current->fs && current->fs->users > 1) + sbytes += kobjsize(current->fs); + else + bytes += kobjsize(current->fs); + + if (current->files && atomic_read(¤t->files->count) > 1) + sbytes += kobjsize(current->files); + else + bytes += kobjsize(current->files); + + if (current->sighand && refcount_read(¤t->sighand->count) > 1) + sbytes += kobjsize(current->sighand); + else + bytes += kobjsize(current->sighand); + + bytes += kobjsize(current); /* includes kernel stack */ + + mmap_read_unlock(mm); + + seq_printf(m, + "Mem:\t%8lu bytes\n" + "Slack:\t%8lu bytes\n" + "Shared:\t%8lu bytes\n", + bytes, slack, sbytes); +} + +unsigned long task_vsize(struct mm_struct *mm) +{ + VMA_ITERATOR(vmi, mm, 0); + struct vm_area_struct *vma; + unsigned long vsize = 0; + + mmap_read_lock(mm); + for_each_vma(vmi, vma) + vsize += vma->vm_end - vma->vm_start; + mmap_read_unlock(mm); + return vsize; +} + +unsigned long task_statm(struct mm_struct *mm, + unsigned long *shared, unsigned long *text, + unsigned long *data, unsigned long *resident) +{ + VMA_ITERATOR(vmi, mm, 0); + struct vm_area_struct *vma; + struct vm_region *region; + unsigned long size = kobjsize(mm); + + mmap_read_lock(mm); + for_each_vma(vmi, vma) { + size += kobjsize(vma); + region = vma->vm_region; + if (region) { + size += kobjsize(region); + size += region->vm_end - region->vm_start; + } + } + + *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) + >> PAGE_SHIFT; + *data = (PAGE_ALIGN(mm->start_stack) - (mm->start_data & PAGE_MASK)) + >> PAGE_SHIFT; + mmap_read_unlock(mm); + size >>= PAGE_SHIFT; + size += *text + *data; + *resident = size; + return size; +} + +/* + * display a single VMA to a sequenced file + */ +static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma) +{ + struct mm_struct *mm = vma->vm_mm; + unsigned long ino = 0; + struct file *file; + dev_t dev = 0; + int flags; + unsigned long long pgoff = 0; + + flags = vma->vm_flags; + file = vma->vm_file; + + if (file) { + struct inode *inode = file_inode(vma->vm_file); + dev = inode->i_sb->s_dev; + ino = inode->i_ino; + pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT; + } + + seq_setwidth(m, 25 + sizeof(void *) * 6 - 1); + seq_printf(m, + "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ", + vma->vm_start, + vma->vm_end, + flags & VM_READ ? 'r' : '-', + flags & VM_WRITE ? 'w' : '-', + flags & VM_EXEC ? 'x' : '-', + flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p', + pgoff, + MAJOR(dev), MINOR(dev), ino); + + if (file) { + seq_pad(m, ' '); + seq_path(m, file_user_path(file), ""); + } else if (mm && vma_is_initial_stack(vma)) { + seq_pad(m, ' '); + seq_puts(m, "[stack]"); + } + + seq_putc(m, '\n'); + return 0; +} + +/* + * display mapping lines for a particular process's /proc/pid/maps + */ +static int show_map(struct seq_file *m, void *_p) +{ + return nommu_vma_show(m, _p); +} + +static struct vm_area_struct *proc_get_vma(struct proc_maps_private *priv, + loff_t *ppos) +{ + struct vm_area_struct *vma = vma_next(&priv->iter); + + if (vma) { + *ppos = vma->vm_start; + } else { + *ppos = -1UL; + } + + return vma; +} + +static void *m_start(struct seq_file *m, loff_t *ppos) +{ + struct proc_maps_private *priv = m->private; + unsigned long last_addr = *ppos; + struct mm_struct *mm; + + /* See proc_get_vma(). Zero at the start or after lseek. */ + if (last_addr == -1UL) + return NULL; + + /* pin the task and mm whilst we play with them */ + priv->task = get_proc_task(priv->inode); + if (!priv->task) + return ERR_PTR(-ESRCH); + + mm = priv->lock_ctx.mm; + if (!mm || !mmget_not_zero(mm)) { + put_task_struct(priv->task); + priv->task = NULL; + return NULL; + } + + if (mmap_read_lock_killable(mm)) { + mmput(mm); + put_task_struct(priv->task); + priv->task = NULL; + return ERR_PTR(-EINTR); + } + + vma_iter_init(&priv->iter, mm, last_addr); + + return proc_get_vma(priv, ppos); +} + +static void m_stop(struct seq_file *m, void *v) +{ + struct proc_maps_private *priv = m->private; + struct mm_struct *mm = priv->lock_ctx.mm; + + if (!priv->task) + return; + + mmap_read_unlock(mm); + mmput(mm); + put_task_struct(priv->task); + priv->task = NULL; +} + +static void *m_next(struct seq_file *m, void *_p, loff_t *ppos) +{ + return proc_get_vma(m->private, ppos); +} + +static const struct seq_operations proc_pid_maps_ops = { + .start = m_start, + .next = m_next, + .stop = m_stop, + .show = show_map +}; + +static int maps_open(struct inode *inode, struct file *file, + const struct seq_operations *ops) +{ + struct proc_maps_private *priv; + + priv = __seq_open_private(file, ops, sizeof(*priv)); + if (!priv) + return -ENOMEM; + + priv->inode = inode; + priv->lock_ctx.mm = proc_mem_open(inode, PTRACE_MODE_READ); + if (IS_ERR_OR_NULL(priv->lock_ctx.mm)) { + int err = priv->lock_ctx.mm ? PTR_ERR(priv->lock_ctx.mm) : -ESRCH; + + seq_release_private(inode, file); + return err; + } + + return 0; +} + + +static int map_release(struct inode *inode, struct file *file) +{ + struct seq_file *seq = file->private_data; + struct proc_maps_private *priv = seq->private; + + if (priv->lock_ctx.mm) + mmdrop(priv->lock_ctx.mm); + + return seq_release_private(inode, file); +} + +static int pid_maps_open(struct inode *inode, struct file *file) +{ + return maps_open(inode, file, &proc_pid_maps_ops); +} + +const struct file_operations proc_pid_maps_operations = { + .open = pid_maps_open, + .read = seq_read, + .llseek = seq_lseek, + .release = map_release, +}; + -- cgit v1.3.1