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Commit bbfe59f8 authored by Sukadev Bhattiprolu's avatar Sukadev Bhattiprolu Committed by Michael Ellerman
Browse files

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: default avatarSukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent b25b33ac

arch/powerpc/platforms/powernv/vas-window.c

+73 −0
Original line number Diff line number Diff line
@@ -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)

{