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powerpc/vas: Export HVWC to debugfs

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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>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Sukadev Bhattiprolu
2017-11-07 18:23:51 -08:00
committed by Michael Ellerman
parent d4ef61b5e8
commit ece4e51291
5 changed files with 257 additions and 9 deletions
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14
arch/powerpc/platforms/powernv/vas.h
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@@ -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)