Define helpers to allocate/free VAS window objects. These will be used in follow-on patches when opening/closing windows.
Signed-off-by: Sukadev Bhattiprolu <suka...@linux.vnet.ibm.com> --- arch/powerpc/platforms/powernv/vas-window.c | 63 ++++++++++++++++++++++++++++- 1 file changed, 62 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/platforms/powernv/vas-window.c b/arch/powerpc/platforms/powernv/vas-window.c index 5ddcb63..0c178fe 100644 --- a/arch/powerpc/platforms/powernv/vas-window.c +++ b/arch/powerpc/platforms/powernv/vas-window.c @@ -120,7 +120,7 @@ static void unmap_wc_mmio_bars(struct vas_window *window) * OS/User Window Context (UWC) MMIO Base Address Region for the given window. * Map these bus addresses and save the mapped kernel addresses in @window. */ -int map_wc_mmio_bars(struct vas_window *window) +static int map_wc_mmio_bars(struct vas_window *window) { int len; uint64_t start; @@ -437,6 +437,67 @@ int init_winctx_regs(struct vas_window *window, struct vas_winctx *winctx) return 0; } +DEFINE_SPINLOCK(vas_ida_lock); + +void vas_release_window_id(struct ida *ida, int winid) +{ + spin_lock(&vas_ida_lock); + ida_remove(ida, winid); + spin_unlock(&vas_ida_lock); +} + +int vas_assign_window_id(struct ida *ida) +{ + int rc, winid; + + rc = ida_pre_get(ida, GFP_KERNEL); + if (!rc) + return -EAGAIN; + + spin_lock(&vas_ida_lock); + rc = ida_get_new_above(ida, 0, &winid); + spin_unlock(&vas_ida_lock); + + if (rc) + return rc; + + if (winid > VAS_MAX_WINDOWS_PER_CHIP) { + pr_err("VAS: 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) +{ + unmap_wc_mmio_bars(window); + kfree(window->paste_addr_name); + kfree(window); +} + +struct vas_window *vas_window_alloc(struct vas_instance *vinst, int id) +{ + struct vas_window *window; + + window = kzalloc(sizeof(*window), GFP_KERNEL); + if (!window) + return NULL; + + window->vinst = vinst; + window->winid = id; + + if (map_wc_mmio_bars(window)) + goto out_free; + + return window; + +out_free: + kfree(window); + return NULL; +} + /* stub for now */ int vas_win_close(struct vas_window *window) { -- 2.7.4