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powerpc/powernv/vas: Define helpers to alloc/free windows 

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>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Sukadev Bhattiprolu 2017-08-28 23:23:36 -07:00 committed by Michael Ellerman
parent b25b33ac18
commit bbfe59f8a7
1 changed files with 73 additions and 0 deletions
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73
arch/powerpc/platforms/powernv/vas-window.c
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@ -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)
{