Messages in this thread Patch in this message |  | | From | Sukadev Bhattiprolu <> | Subject | [PATCH v7 06/12] powerpc/vas: Define helpers to alloc/free windows | Date | Wed, 23 Aug 2017 23:38:02 -0700 |
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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 <sukadev@linux.vnet.ibm.com> --- arch/powerpc/platforms/powernv/vas-window.c | 70 +++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+)
diff --git a/arch/powerpc/platforms/powernv/vas-window.c b/arch/powerpc/platforms/powernv/vas-window.c index 3a50d6a..9c12919 100644 --- a/arch/powerpc/platforms/powernv/vas-window.c +++ b/arch/powerpc/platforms/powernv/vas-window.c @@ -490,6 +490,76 @@ 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_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) +{ + 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) + return ERR_PTR(-ENOMEM); + + window->vinst = vinst; + window->winid = winid; + + if (map_winctx_mmio_bars(window)) + goto out_free; + + return window; + +out_free: + kfree(window); + return ERR_PTR(-ENOMEM); +} + /* stub for now */ int vas_win_close(struct vas_window *window) { -- 2.7.4
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