Commit ece4e512 authored by Sukadev Bhattiprolu's avatar Sukadev Bhattiprolu Committed by Michael Ellerman

powerpc/vas: Export HVWC to debugfs

Export the VAS Window context information to debugfs.

We need to hold a mutex when closing the window to prevent a race
with the debugfs read(). Rather than introduce a per-instance mutex,
we use the global vas_mutex for now, since it is not heavily contended.

The window->cop field is only relevant to a receive window so we were
not setting it for a send window (which is is paired to a receive window
anyway). But to simplify reporting in debugfs, set the 'cop' field for the
send window also.
Signed-off-by: default avatarSukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent d4ef61b5
......@@ -14,4 +14,5 @@ obj-$(CONFIG_TRACEPOINTS) += opal-tracepoints.o
obj-$(CONFIG_OPAL_PRD) += opal-prd.o
obj-$(CONFIG_PERF_EVENTS) += opal-imc.o
obj-$(CONFIG_PPC_MEMTRACE) += memtrace.o
obj-$(CONFIG_PPC_VAS) += vas.o vas-window.o
obj-$(CONFIG_PPC_VAS) += vas.o vas-window.o vas-debug.o
obj-$(CONFIG_PPC_FTW) += nx-ftw.o
/*
* Copyright 2016-17 IBM Corp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#define pr_fmt(fmt) "vas: " fmt
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include "vas.h"
static struct dentry *vas_debugfs;
static char *cop_to_str(int cop)
{
switch (cop) {
case VAS_COP_TYPE_FAULT: return "Fault";
case VAS_COP_TYPE_842: return "NX-842 Normal Priority";
case VAS_COP_TYPE_842_HIPRI: return "NX-842 High Priority";
case VAS_COP_TYPE_GZIP: return "NX-GZIP Normal Priority";
case VAS_COP_TYPE_GZIP_HIPRI: return "NX-GZIP High Priority";
case VAS_COP_TYPE_FTW: return "Fast Thread-wakeup";
default: return "Unknown";
}
}
static int info_dbg_show(struct seq_file *s, void *private)
{
struct vas_window *window = s->private;
mutex_lock(&vas_mutex);
/* ensure window is not unmapped */
if (!window->hvwc_map)
goto unlock;
seq_printf(s, "Type: %s, %s\n", cop_to_str(window->cop),
window->tx_win ? "Send" : "Receive");
seq_printf(s, "Pid : %d\n", window->pid);
unlock:
mutex_unlock(&vas_mutex);
return 0;
}
static int info_dbg_open(struct inode *inode, struct file *file)
{
return single_open(file, info_dbg_show, inode->i_private);
}
static const struct file_operations info_fops = {
.open = info_dbg_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static inline void print_reg(struct seq_file *s, struct vas_window *win,
char *name, u32 reg)
{
seq_printf(s, "0x%016llx %s\n", read_hvwc_reg(win, name, reg), name);
}
static int hvwc_dbg_show(struct seq_file *s, void *private)
{
struct vas_window *window = s->private;
mutex_lock(&vas_mutex);
/* ensure window is not unmapped */
if (!window->hvwc_map)
goto unlock;
print_reg(s, window, VREG(LPID));
print_reg(s, window, VREG(PID));
print_reg(s, window, VREG(XLATE_MSR));
print_reg(s, window, VREG(XLATE_LPCR));
print_reg(s, window, VREG(XLATE_CTL));
print_reg(s, window, VREG(AMR));
print_reg(s, window, VREG(SEIDR));
print_reg(s, window, VREG(FAULT_TX_WIN));
print_reg(s, window, VREG(OSU_INTR_SRC_RA));
print_reg(s, window, VREG(HV_INTR_SRC_RA));
print_reg(s, window, VREG(PSWID));
print_reg(s, window, VREG(LFIFO_BAR));
print_reg(s, window, VREG(LDATA_STAMP_CTL));
print_reg(s, window, VREG(LDMA_CACHE_CTL));
print_reg(s, window, VREG(LRFIFO_PUSH));
print_reg(s, window, VREG(CURR_MSG_COUNT));
print_reg(s, window, VREG(LNOTIFY_AFTER_COUNT));
print_reg(s, window, VREG(LRX_WCRED));
print_reg(s, window, VREG(LRX_WCRED_ADDER));
print_reg(s, window, VREG(TX_WCRED));
print_reg(s, window, VREG(TX_WCRED_ADDER));
print_reg(s, window, VREG(LFIFO_SIZE));
print_reg(s, window, VREG(WINCTL));
print_reg(s, window, VREG(WIN_STATUS));
print_reg(s, window, VREG(WIN_CTX_CACHING_CTL));
print_reg(s, window, VREG(TX_RSVD_BUF_COUNT));
print_reg(s, window, VREG(LRFIFO_WIN_PTR));
print_reg(s, window, VREG(LNOTIFY_CTL));
print_reg(s, window, VREG(LNOTIFY_PID));
print_reg(s, window, VREG(LNOTIFY_LPID));
print_reg(s, window, VREG(LNOTIFY_TID));
print_reg(s, window, VREG(LNOTIFY_SCOPE));
print_reg(s, window, VREG(NX_UTIL_ADDER));
unlock:
mutex_unlock(&vas_mutex);
return 0;
}
static int hvwc_dbg_open(struct inode *inode, struct file *file)
{
return single_open(file, hvwc_dbg_show, inode->i_private);
}
static const struct file_operations hvwc_fops = {
.open = hvwc_dbg_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
void vas_window_free_dbgdir(struct vas_window *window)
{
if (window->dbgdir) {
debugfs_remove_recursive(window->dbgdir);
kfree(window->dbgname);
window->dbgdir = NULL;
window->dbgname = NULL;
}
}
void vas_window_init_dbgdir(struct vas_window *window)
{
struct dentry *f, *d;
if (!window->vinst->dbgdir)
return;
window->dbgname = kzalloc(16, GFP_KERNEL);
if (!window->dbgname)
return;
snprintf(window->dbgname, 16, "w%d", window->winid);
d = debugfs_create_dir(window->dbgname, window->vinst->dbgdir);
if (IS_ERR(d))
goto free_name;
window->dbgdir = d;
f = debugfs_create_file("info", 0444, d, window, &info_fops);
if (IS_ERR(f))
goto remove_dir;
f = debugfs_create_file("hvwc", 0444, d, window, &hvwc_fops);
if (IS_ERR(f))
goto remove_dir;
return;
free_name:
kfree(window->dbgname);
window->dbgname = NULL;
remove_dir:
debugfs_remove_recursive(window->dbgdir);
window->dbgdir = NULL;
}
void vas_instance_init_dbgdir(struct vas_instance *vinst)
{
struct dentry *d;
if (!vas_debugfs)
return;
vinst->dbgname = kzalloc(16, GFP_KERNEL);
if (!vinst->dbgname)
return;
snprintf(vinst->dbgname, 16, "v%d", vinst->vas_id);
d = debugfs_create_dir(vinst->dbgname, vas_debugfs);
if (IS_ERR(d))
goto free_name;
vinst->dbgdir = d;
return;
free_name:
kfree(vinst->dbgname);
vinst->dbgname = NULL;
vinst->dbgdir = NULL;
}
void vas_init_dbgdir(void)
{
vas_debugfs = debugfs_create_dir("vas", NULL);
if (IS_ERR(vas_debugfs))
vas_debugfs = NULL;
}
......@@ -145,23 +145,37 @@ static void unmap_paste_region(struct vas_window *window)
}
/*
* Unmap the MMIO regions for a window.
* Unmap the MMIO regions for a window. Hold the vas_mutex so we don't
* unmap when the window's debugfs dir is in use. This serializes close
* of a window even on another VAS instance but since its not a critical
* path, just minimize the time we hold the mutex for now. We can add
* a per-instance mutex later if necessary.
*/
static void unmap_winctx_mmio_bars(struct vas_window *window)
{
int len;
void *uwc_map;
void *hvwc_map;
u64 busaddr_start;
if (window->hvwc_map) {
get_hvwc_mmio_bar(window, &busaddr_start, &len);
unmap_region(window->hvwc_map, busaddr_start, len);
mutex_lock(&vas_mutex);
hvwc_map = window->hvwc_map;
window->hvwc_map = NULL;
uwc_map = window->uwc_map;
window->uwc_map = NULL;
mutex_unlock(&vas_mutex);
if (hvwc_map) {
get_hvwc_mmio_bar(window, &busaddr_start, &len);
unmap_region(hvwc_map, busaddr_start, len);
}
if (window->uwc_map) {
if (uwc_map) {
get_uwc_mmio_bar(window, &busaddr_start, &len);
unmap_region(window->uwc_map, busaddr_start, len);
window->uwc_map = NULL;
unmap_region(uwc_map, busaddr_start, len);
}
}
......@@ -528,6 +542,9 @@ static void vas_window_free(struct vas_window *window)
struct vas_instance *vinst = window->vinst;
unmap_winctx_mmio_bars(window);
vas_window_free_dbgdir(window);
kfree(window);
vas_release_window_id(&vinst->ida, winid);
......@@ -552,6 +569,8 @@ static struct vas_window *vas_window_alloc(struct vas_instance *vinst)
if (map_winctx_mmio_bars(window))
goto out_free;
vas_window_init_dbgdir(window);
return window;
out_free:
......@@ -974,6 +993,7 @@ struct vas_window *vas_tx_win_open(int vasid, enum vas_cop_type cop,
goto put_rxwin;
}
txwin->cop = cop;
txwin->tx_win = 1;
txwin->rxwin = rxwin;
txwin->nx_win = txwin->rxwin->nx_win;
......
......@@ -22,7 +22,7 @@
#include "vas.h"
static DEFINE_MUTEX(vas_mutex);
DEFINE_MUTEX(vas_mutex);
static LIST_HEAD(vas_instances);
static DEFINE_PER_CPU(int, cpu_vas_id);
......@@ -86,6 +86,8 @@ static int init_vas_instance(struct platform_device *pdev)
list_add(&vinst->node, &vas_instances);
mutex_unlock(&vas_mutex);
vas_instance_init_dbgdir(vinst);
dev_set_drvdata(&pdev->dev, vinst);
return 0;
......@@ -157,6 +159,8 @@ static int __init vas_init(void)
int found = 0;
struct device_node *dn;
vas_init_dbgdir();
platform_driver_register(&vas_driver);
for_each_compatible_node(dn, NULL, "ibm,vas") {
......
......@@ -13,6 +13,8 @@
#include <linux/idr.h>
#include <asm/vas.h>
#include <linux/io.h>
#include <linux/dcache.h>
#include <linux/mutex.h>
/*
* Overview of Virtual Accelerator Switchboard (VAS).
......@@ -317,6 +319,9 @@ struct vas_instance {
struct mutex mutex;
struct vas_window *rxwin[VAS_COP_TYPE_MAX];
struct vas_window *windows[VAS_WINDOWS_PER_CHIP];
char *dbgname;
struct dentry *dbgdir;
};
/*
......@@ -334,6 +339,9 @@ struct vas_window {
pid_t pid; /* Linux process id of owner */
int wcreds_max; /* Window credits */
char *dbgname;
struct dentry *dbgdir;
/* Fields applicable only to send windows */
void *paste_kaddr;
char *paste_addr_name;
......@@ -394,7 +402,13 @@ struct vas_winctx {
enum vas_notify_after_count notify_after_count;
};
extern struct mutex vas_mutex;
extern struct vas_instance *find_vas_instance(int vasid);
extern void vas_init_dbgdir(void);
extern void vas_instance_init_dbgdir(struct vas_instance *vinst);
extern void vas_window_init_dbgdir(struct vas_window *win);
extern void vas_window_free_dbgdir(struct vas_window *win);
static inline void vas_log_write(struct vas_window *win, char *name,
void *regptr, u64 val)
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment