diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/platforms/powernv/vas-window.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/vas-window.c b/arch/powerpc/platforms/powernv/vas-window.c index 68dfe538e0f6..bfc9dba24b65 100644 --- a/arch/powerpc/platforms/powernv/vas-window.c +++ b/arch/powerpc/platforms/powernv/vas-window.c @@ -485,6 +485,79 @@ int init_winctx_regs(struct vas_window *window, struct vas_winctx *winctx) return 0; } +static DEFINE_SPINLOCK(vas_ida_lock); + +static void vas_release_window_id(struct ida *ida, int winid) +{ + spin_lock(&vas_ida_lock); + ida_remove(ida, winid); + spin_unlock(&vas_ida_lock); +} + +static int vas_assign_window_id(struct ida *ida) +{ + int rc, winid; + + do { + rc = ida_pre_get(ida, GFP_KERNEL); + if (!rc) + return -EAGAIN; + + spin_lock(&vas_ida_lock); + rc = ida_get_new(ida, &winid); + spin_unlock(&vas_ida_lock); + } while (rc == -EAGAIN); + + if (rc) + return rc; + + if (winid > VAS_WINDOWS_PER_CHIP) { + pr_err("Too many (%d) open windows\n", winid); + vas_release_window_id(ida, winid); + return -EAGAIN; + } + + return winid; +} + +void vas_window_free(struct vas_window *window) +{ + int winid = window->winid; + struct vas_instance *vinst = window->vinst; + + unmap_winctx_mmio_bars(window); + kfree(window); + + vas_release_window_id(&vinst->ida, winid); +} + +struct vas_window *vas_window_alloc(struct vas_instance *vinst) +{ + int winid; + struct vas_window *window; + + winid = vas_assign_window_id(&vinst->ida); + if (winid < 0) + return ERR_PTR(winid); + + window = kzalloc(sizeof(*window), GFP_KERNEL); + if (!window) + goto out_free; + + window->vinst = vinst; + window->winid = winid; + + if (map_winctx_mmio_bars(window)) + goto out_free; + + return window; + +out_free: + kfree(window); + vas_release_window_id(&vinst->ida, winid); + return ERR_PTR(-ENOMEM); +} + /* stub for now */ int vas_win_close(struct vas_window *window) { |