arch/tile: more /proc and /sys file support
This change introduces a few of the less controversial /proc and /proc/sys interfaces for tile, along with sysfs attributes for various things that were originally proposed as /proc/tile files. It also adjusts the "hardwall" proc API. Arnd Bergmann reviewed the initial arch/tile submission, which included a complete set of all the /proc/tile and /proc/sys/tile knobs that we had added in a somewhat ad hoc way during initial development, and provided feedback on where most of them should go. One knob turned out to be similar enough to the existing /proc/sys/debug/exception-trace that it was re-implemented to use that model instead. Another knob was /proc/tile/grid, which reported the "grid" dimensions of a tile chip (e.g. 8x8 processors = 64-core chip). Arnd suggested looking at sysfs for that, so this change moves that information to a pair of sysfs attributes (chip_width and chip_height) in the /sys/devices/system/cpu directory. We also put the "chip_serial" and "chip_revision" information from our old /proc/tile/board file as attributes in /sys/devices/system/cpu. Other information collected via hypervisor APIs is now placed in /sys/hypervisor. We create a /sys/hypervisor/type file (holding the constant string "tilera") to be parallel with the Xen use of /sys/hypervisor/type holding "xen". We create three top-level files, "version" (the hypervisor's own version), "config_version" (the version of the configuration file), and "hvconfig" (the contents of the configuration file). The remaining information from our old /proc/tile/board and /proc/tile/switch files becomes an attribute group appearing under /sys/hypervisor/board/. Finally, after some feedback from Arnd Bergmann for the previous version of this patch, the /proc/tile/hardwall file is split up into two conceptual parts. First, a directory /proc/tile/hardwall/ which contains one file per active hardwall, each file named after the hardwall's ID and holding a cpulist that says which cpus are enclosed by the hardwall. Second, a /proc/PID file "hardwall" that is either empty (for non-hardwall-using processes) or contains the hardwall ID. Finally, this change pushes the /proc/sys/tile/unaligned_fixup/ directory, with knobs controlling the kernel code for handling the fixup of unaligned exceptions. Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf
Родитель
7a0287df3e
Коммит
f133ecca9c
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@ -12,6 +12,7 @@ config TILE
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select GENERIC_IRQ_PROBE
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select GENERIC_PENDING_IRQ if SMP
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select GENERIC_IRQ_SHOW
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select SYS_HYPERVISOR
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# FIXME: investigate whether we need/want these options.
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# select HAVE_IOREMAP_PROT
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@ -40,6 +40,10 @@
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#define HARDWALL_DEACTIVATE \
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_IO(HARDWALL_IOCTL_BASE, _HARDWALL_DEACTIVATE)
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#define _HARDWALL_GET_ID 4
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#define HARDWALL_GET_ID \
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_IO(HARDWALL_IOCTL_BASE, _HARDWALL_GET_ID)
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#ifndef __KERNEL__
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/* This is the canonical name expected by userspace. */
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@ -47,9 +51,14 @@
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#else
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/* Hook for /proc/tile/hardwall. */
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struct seq_file;
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int proc_tile_hardwall_show(struct seq_file *sf, void *v);
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/* /proc hooks for hardwall. */
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struct proc_dir_entry;
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#ifdef CONFIG_HARDWALL
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void proc_tile_hardwall_init(struct proc_dir_entry *root);
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int proc_pid_hardwall(struct task_struct *task, char *buffer);
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#else
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static inline void proc_tile_hardwall_init(struct proc_dir_entry *root) {}
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#endif
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#endif
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@ -5,7 +5,7 @@
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extra-y := vmlinux.lds head_$(BITS).o
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obj-y := backtrace.o entry.o init_task.o irq.o messaging.o \
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pci-dma.o proc.o process.o ptrace.o reboot.o \
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setup.o signal.o single_step.o stack.o sys.o time.o traps.o \
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setup.o signal.o single_step.o stack.o sys.o sysfs.o time.o traps.o \
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intvec_$(BITS).o regs_$(BITS).o tile-desc_$(BITS).o
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obj-$(CONFIG_HARDWALL) += hardwall.o
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@ -40,16 +40,25 @@
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struct hardwall_info {
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struct list_head list; /* "rectangles" list */
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struct list_head task_head; /* head of tasks in this hardwall */
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struct cpumask cpumask; /* cpus in the rectangle */
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int ulhc_x; /* upper left hand corner x coord */
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int ulhc_y; /* upper left hand corner y coord */
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int width; /* rectangle width */
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int height; /* rectangle height */
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int id; /* integer id for this hardwall */
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int teardown_in_progress; /* are we tearing this one down? */
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};
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/* Currently allocated hardwall rectangles */
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static LIST_HEAD(rectangles);
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/* /proc/tile/hardwall */
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static struct proc_dir_entry *hardwall_proc_dir;
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/* Functions to manage files in /proc/tile/hardwall. */
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static void hardwall_add_proc(struct hardwall_info *rect);
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static void hardwall_remove_proc(struct hardwall_info *rect);
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/*
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* Guard changes to the hardwall data structures.
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* This could be finer grained (e.g. one lock for the list of hardwall
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@ -105,6 +114,8 @@ static int setup_rectangle(struct hardwall_info *r, struct cpumask *mask)
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r->ulhc_y = cpu_y(ulhc);
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r->width = cpu_x(lrhc) - r->ulhc_x + 1;
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r->height = cpu_y(lrhc) - r->ulhc_y + 1;
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cpumask_copy(&r->cpumask, mask);
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r->id = ulhc; /* The ulhc cpu id can be the hardwall id. */
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/* Width and height must be positive */
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if (r->width <= 0 || r->height <= 0)
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@ -388,6 +399,9 @@ static struct hardwall_info *hardwall_create(
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/* Set up appropriate hardwalling on all affected cpus. */
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hardwall_setup(rect);
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/* Create a /proc/tile/hardwall entry. */
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hardwall_add_proc(rect);
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return rect;
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}
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@ -645,6 +659,9 @@ static void hardwall_destroy(struct hardwall_info *rect)
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/* Restart switch and disable firewall. */
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on_each_cpu_mask(&mask, restart_udn_switch, NULL, 1);
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/* Remove the /proc/tile/hardwall entry. */
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hardwall_remove_proc(rect);
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/* Now free the rectangle from the list. */
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spin_lock_irqsave(&hardwall_lock, flags);
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BUG_ON(!list_empty(&rect->task_head));
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@ -654,35 +671,57 @@ static void hardwall_destroy(struct hardwall_info *rect)
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}
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/*
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* Dump hardwall state via /proc; initialized in arch/tile/sys/proc.c.
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*/
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int proc_tile_hardwall_show(struct seq_file *sf, void *v)
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static int hardwall_proc_show(struct seq_file *sf, void *v)
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{
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struct hardwall_info *r;
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struct hardwall_info *rect = sf->private;
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char buf[256];
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if (udn_disabled) {
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seq_printf(sf, "%dx%d 0,0 pids:\n", smp_width, smp_height);
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return 0;
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}
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spin_lock_irq(&hardwall_lock);
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list_for_each_entry(r, &rectangles, list) {
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struct task_struct *p;
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seq_printf(sf, "%dx%d %d,%d pids:",
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r->width, r->height, r->ulhc_x, r->ulhc_y);
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list_for_each_entry(p, &r->task_head, thread.hardwall_list) {
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unsigned int cpu = cpumask_first(&p->cpus_allowed);
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unsigned int x = cpu % smp_width;
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unsigned int y = cpu / smp_width;
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seq_printf(sf, " %d@%d,%d", p->pid, x, y);
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}
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seq_printf(sf, "\n");
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}
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spin_unlock_irq(&hardwall_lock);
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int rc = cpulist_scnprintf(buf, sizeof(buf), &rect->cpumask);
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buf[rc++] = '\n';
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seq_write(sf, buf, rc);
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return 0;
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}
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static int hardwall_proc_open(struct inode *inode,
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struct file *file)
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{
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return single_open(file, hardwall_proc_show, PDE(inode)->data);
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}
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static const struct file_operations hardwall_proc_fops = {
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.open = hardwall_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static void hardwall_add_proc(struct hardwall_info *rect)
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{
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char buf[64];
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snprintf(buf, sizeof(buf), "%d", rect->id);
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proc_create_data(buf, 0444, hardwall_proc_dir,
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&hardwall_proc_fops, rect);
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}
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static void hardwall_remove_proc(struct hardwall_info *rect)
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{
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char buf[64];
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snprintf(buf, sizeof(buf), "%d", rect->id);
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remove_proc_entry(buf, hardwall_proc_dir);
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}
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int proc_pid_hardwall(struct task_struct *task, char *buffer)
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{
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struct hardwall_info *rect = task->thread.hardwall;
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return rect ? sprintf(buffer, "%d\n", rect->id) : 0;
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}
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void proc_tile_hardwall_init(struct proc_dir_entry *root)
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{
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if (!udn_disabled)
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hardwall_proc_dir = proc_mkdir("hardwall", root);
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}
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/*
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* Character device support via ioctl/close.
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@ -716,6 +755,9 @@ static long hardwall_ioctl(struct file *file, unsigned int a, unsigned long b)
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return -EINVAL;
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return hardwall_deactivate(current);
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case _HARDWALL_GET_ID:
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return rect ? rect->id : -EINVAL;
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default:
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return -EINVAL;
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}
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@ -27,6 +27,7 @@
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#include <asm/processor.h>
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#include <asm/sections.h>
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#include <asm/homecache.h>
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#include <asm/hardwall.h>
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#include <arch/chip.h>
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@ -88,3 +89,75 @@ const struct seq_operations cpuinfo_op = {
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.stop = c_stop,
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.show = show_cpuinfo,
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};
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/*
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* Support /proc/tile directory
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*/
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static int __init proc_tile_init(void)
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{
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struct proc_dir_entry *root = proc_mkdir("tile", NULL);
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if (root == NULL)
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return 0;
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proc_tile_hardwall_init(root);
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return 0;
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}
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arch_initcall(proc_tile_init);
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/*
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* Support /proc/sys/tile directory
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*/
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#ifndef __tilegx__ /* FIXME: GX: no support for unaligned access yet */
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static ctl_table unaligned_subtable[] = {
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{
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.procname = "enabled",
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.data = &unaligned_fixup,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.procname = "printk",
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.data = &unaligned_printk,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.procname = "count",
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.data = &unaligned_fixup_count,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{}
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};
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static ctl_table unaligned_table[] = {
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{
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.procname = "unaligned_fixup",
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.mode = 0555,
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.child = unaligned_subtable
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},
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{}
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};
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#endif
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static struct ctl_path tile_path[] = {
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{ .procname = "tile" },
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{ }
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};
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static int __init proc_sys_tile_init(void)
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{
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#ifndef __tilegx__ /* FIXME: GX: no support for unaligned access yet */
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register_sysctl_paths(tile_path, unaligned_table);
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#endif
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return 0;
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}
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arch_initcall(proc_sys_tile_init);
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@ -0,0 +1,185 @@
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/*
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* Copyright 2011 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*
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* /sys entry support.
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*/
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#include <linux/sysdev.h>
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#include <linux/cpu.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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#include <hv/hypervisor.h>
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/* Return a string queried from the hypervisor, truncated to page size. */
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static ssize_t get_hv_confstr(char *page, int query)
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{
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ssize_t n = hv_confstr(query, (unsigned long)page, PAGE_SIZE - 1);
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n = n < 0 ? 0 : min(n, (ssize_t)PAGE_SIZE - 1) - 1;
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if (n)
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page[n++] = '\n';
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page[n] = '\0';
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return n;
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}
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static ssize_t chip_width_show(struct sysdev_class *dev,
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struct sysdev_class_attribute *attr,
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char *page)
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{
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return sprintf(page, "%u\n", smp_width);
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}
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static SYSDEV_CLASS_ATTR(chip_width, 0444, chip_width_show, NULL);
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static ssize_t chip_height_show(struct sysdev_class *dev,
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struct sysdev_class_attribute *attr,
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char *page)
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{
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return sprintf(page, "%u\n", smp_height);
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}
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static SYSDEV_CLASS_ATTR(chip_height, 0444, chip_height_show, NULL);
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static ssize_t chip_serial_show(struct sysdev_class *dev,
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struct sysdev_class_attribute *attr,
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char *page)
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{
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return get_hv_confstr(page, HV_CONFSTR_CHIP_SERIAL_NUM);
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}
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static SYSDEV_CLASS_ATTR(chip_serial, 0444, chip_serial_show, NULL);
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static ssize_t chip_revision_show(struct sysdev_class *dev,
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struct sysdev_class_attribute *attr,
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char *page)
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{
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return get_hv_confstr(page, HV_CONFSTR_CHIP_REV);
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}
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static SYSDEV_CLASS_ATTR(chip_revision, 0444, chip_revision_show, NULL);
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static ssize_t type_show(struct sysdev_class *dev,
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struct sysdev_class_attribute *attr,
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char *page)
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{
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return sprintf(page, "tilera\n");
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}
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static SYSDEV_CLASS_ATTR(type, 0444, type_show, NULL);
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#define HV_CONF_ATTR(name, conf) \
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static ssize_t name ## _show(struct sysdev_class *dev, \
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struct sysdev_class_attribute *attr, \
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char *page) \
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{ \
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return get_hv_confstr(page, conf); \
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} \
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static SYSDEV_CLASS_ATTR(name, 0444, name ## _show, NULL);
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HV_CONF_ATTR(version, HV_CONFSTR_HV_SW_VER)
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HV_CONF_ATTR(config_version, HV_CONFSTR_HV_CONFIG_VER)
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HV_CONF_ATTR(board_part, HV_CONFSTR_BOARD_PART_NUM)
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HV_CONF_ATTR(board_serial, HV_CONFSTR_BOARD_SERIAL_NUM)
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HV_CONF_ATTR(board_revision, HV_CONFSTR_BOARD_REV)
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HV_CONF_ATTR(board_description, HV_CONFSTR_BOARD_DESC)
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HV_CONF_ATTR(mezz_part, HV_CONFSTR_MEZZ_PART_NUM)
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HV_CONF_ATTR(mezz_serial, HV_CONFSTR_MEZZ_SERIAL_NUM)
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HV_CONF_ATTR(mezz_revision, HV_CONFSTR_MEZZ_REV)
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HV_CONF_ATTR(mezz_description, HV_CONFSTR_MEZZ_DESC)
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HV_CONF_ATTR(switch_control, HV_CONFSTR_SWITCH_CONTROL)
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static struct attribute *board_attrs[] = {
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&attr_board_part.attr,
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&attr_board_serial.attr,
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&attr_board_revision.attr,
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&attr_board_description.attr,
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&attr_mezz_part.attr,
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&attr_mezz_serial.attr,
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&attr_mezz_revision.attr,
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&attr_mezz_description.attr,
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&attr_switch_control.attr,
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NULL
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};
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static struct attribute_group board_attr_group = {
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.name = "board",
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.attrs = board_attrs,
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};
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static struct bin_attribute hvconfig_bin;
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static ssize_t
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hvconfig_bin_read(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t off, size_t count)
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{
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||||
static size_t size;
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/* Lazily learn the true size (minus the trailing NUL). */
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if (size == 0)
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size = hv_confstr(HV_CONFSTR_HV_CONFIG, 0, 0) - 1;
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||||
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/* Check and adjust input parameters. */
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if (off > size)
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return -EINVAL;
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if (count > size - off)
|
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count = size - off;
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||||
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if (count) {
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/* Get a copy of the hvc and copy out the relevant portion. */
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char *hvc;
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||||
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size = off + count;
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hvc = kmalloc(size, GFP_KERNEL);
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if (hvc == NULL)
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return -ENOMEM;
|
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hv_confstr(HV_CONFSTR_HV_CONFIG, (unsigned long)hvc, size);
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memcpy(buf, hvc + off, count);
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kfree(hvc);
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}
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||||
return count;
|
||||
}
|
||||
|
||||
static int __init create_sysfs_entries(void)
|
||||
{
|
||||
struct sysdev_class *cls = &cpu_sysdev_class;
|
||||
int err = 0;
|
||||
|
||||
#define create_cpu_attr(name) \
|
||||
if (!err) \
|
||||
err = sysfs_create_file(&cls->kset.kobj, &attr_##name.attr);
|
||||
create_cpu_attr(chip_width);
|
||||
create_cpu_attr(chip_height);
|
||||
create_cpu_attr(chip_serial);
|
||||
create_cpu_attr(chip_revision);
|
||||
|
||||
#define create_hv_attr(name) \
|
||||
if (!err) \
|
||||
err = sysfs_create_file(hypervisor_kobj, &attr_##name.attr);
|
||||
create_hv_attr(type);
|
||||
create_hv_attr(version);
|
||||
create_hv_attr(config_version);
|
||||
|
||||
if (!err)
|
||||
err = sysfs_create_group(hypervisor_kobj, &board_attr_group);
|
||||
|
||||
if (!err) {
|
||||
sysfs_bin_attr_init(&hvconfig_bin);
|
||||
hvconfig_bin.attr.name = "hvconfig";
|
||||
hvconfig_bin.attr.mode = S_IRUGO;
|
||||
hvconfig_bin.read = hvconfig_bin_read;
|
||||
hvconfig_bin.size = PAGE_SIZE;
|
||||
err = sysfs_create_bin_file(hypervisor_kobj, &hvconfig_bin);
|
||||
}
|
||||
|
||||
return err;
|
||||
}
|
||||
subsys_initcall(create_sysfs_entries);
|
||||
|
|
@ -83,6 +83,9 @@
|
|||
#include <linux/pid_namespace.h>
|
||||
#include <linux/fs_struct.h>
|
||||
#include <linux/slab.h>
|
||||
#ifdef CONFIG_HARDWALL
|
||||
#include <asm/hardwall.h>
|
||||
#endif
|
||||
#include "internal.h"
|
||||
|
||||
/* NOTE:
|
||||
|
|
@ -2894,6 +2897,9 @@ static const struct pid_entry tgid_base_stuff[] = {
|
|||
#ifdef CONFIG_TASK_IO_ACCOUNTING
|
||||
INF("io", S_IRUGO, proc_tgid_io_accounting),
|
||||
#endif
|
||||
#ifdef CONFIG_HARDWALL
|
||||
INF("hardwall", S_IRUGO, proc_pid_hardwall),
|
||||
#endif
|
||||
};
|
||||
|
||||
static int proc_tgid_base_readdir(struct file * filp,
|
||||
|
|
@ -3232,6 +3238,9 @@ static const struct pid_entry tid_base_stuff[] = {
|
|||
#ifdef CONFIG_TASK_IO_ACCOUNTING
|
||||
INF("io", S_IRUGO, proc_tid_io_accounting),
|
||||
#endif
|
||||
#ifdef CONFIG_HARDWALL
|
||||
INF("hardwall", S_IRUGO, proc_pid_hardwall),
|
||||
#endif
|
||||
};
|
||||
|
||||
static int proc_tid_base_readdir(struct file * filp,
|
||||
|
|
|
|||
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