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Subject[PATCH v2 11/18] powerpc/vas: Export HVWC to debugfs
Date
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: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
---
arch/powerpc/platforms/powernv/Makefile | 3 +-
arch/powerpc/platforms/powernv/vas-debug.c | 209 ++++++++++++++++++++++++++++
arch/powerpc/platforms/powernv/vas-window.c | 34 ++++-
arch/powerpc/platforms/powernv/vas.c | 6 +-
arch/powerpc/platforms/powernv/vas.h | 14 ++
5 files changed, 259 insertions(+), 7 deletions(-)
create mode 100644 arch/powerpc/platforms/powernv/vas-debug.c

diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile
index 37d60f7..17921c4 100644
--- a/arch/powerpc/platforms/powernv/Makefile
+++ b/arch/powerpc/platforms/powernv/Makefile
@@ -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
diff --git a/arch/powerpc/platforms/powernv/vas-debug.c b/arch/powerpc/platforms/powernv/vas-debug.c
new file mode 100644
index 0000000..ca22f1e
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/vas-debug.c
@@ -0,0 +1,209 @@
+/*
+ * 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;
+}
diff --git a/arch/powerpc/platforms/powernv/vas-window.c b/arch/powerpc/platforms/powernv/vas-window.c
index 23c13a7..088ce56 100644
--- a/arch/powerpc/platforms/powernv/vas-window.c
+++ b/arch/powerpc/platforms/powernv/vas-window.c
@@ -145,24 +145,42 @@ 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;

+ mutex_lock(&vas_mutex);
+
if (window->hvwc_map) {
- get_hvwc_mmio_bar(window, &busaddr_start, &len);
- unmap_region(window->hvwc_map, busaddr_start, len);
+ hvwc_map = window->hvwc_map;
window->hvwc_map = NULL;
}

if (window->uwc_map) {
- get_uwc_mmio_bar(window, &busaddr_start, &len);
- unmap_region(window->uwc_map, busaddr_start, len);
+ 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 (uwc_map) {
+ get_uwc_mmio_bar(window, &busaddr_start, &len);
+ unmap_region(uwc_map, busaddr_start, len);
+ }
}

/*
@@ -528,6 +546,9 @@ 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 +573,8 @@ 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 +997,7 @@ 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;
diff --git a/arch/powerpc/platforms/powernv/vas.c b/arch/powerpc/platforms/powernv/vas.c
index cd9a733..c488621 100644
--- a/arch/powerpc/platforms/powernv/vas.c
+++ b/arch/powerpc/platforms/powernv/vas.c
@@ -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") {
diff --git a/arch/powerpc/platforms/powernv/vas.h b/arch/powerpc/platforms/powernv/vas.h
index ad906f6..145749a 100644
--- a/arch/powerpc/platforms/powernv/vas.h
+++ b/arch/powerpc/platforms/powernv/vas.h
@@ -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)
--
2.7.4
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