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Date:   Tue, 19 Jan 2021 18:10:42 +0800
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Subject: [PATCH 2/4] usb: host: export symbols for xhci hooks usage
From:   Howard Yen <howardyen@google.com>
To:     gregkh@linuxfoundation.org, robh+dt@kernel.org,
        mathias.nyman@intel.com
Cc:     linux-usb@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, Howard Yen <howardyen@google.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

Export symbols for xhci hooks usage:
    xhci_ring_free
        - Allow xhci hook to free xhci_ring.
    xhci_get_slot_ctx
        - Allow xhci hook to get slot_ctx from the xhci_container_ctx
	  for getting the slot_ctx information to know which slot is
	  offloading and compare the context in remote subsystem memory
	  if needed.
    xhci_get_ep_ctx
        - Allow xhci hook to get ep_ctx from the xhci_container_ctx for
	  getting the ep_ctx information to know which ep is offloading and
	  comparing the context in remote subsystem memory if needed.
    xhci_handle_event
        - Allow xhci hook to handle the xhci events from the USB
	  controller.
    xhci_update_erst_dequeue
        - If xhci events was handle by xhci hook, it needs to update
	  the erst dequeue pointer to let the USB controller know the
	  events was handled.

Signed-off-by: Howard Yen <howardyen@google.com>
---
 drivers/usb/host/xhci-mem.c  | 3 +++
 drivers/usb/host/xhci-ring.c | 6 ++++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index f3dbc5956290..69f19774b914 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -289,6 +289,7 @@ void xhci_ring_free(struct xhci_hcd *xhci, struct xhci_ring *ring)
 
 	kfree(ring);
 }
+EXPORT_SYMBOL_GPL(xhci_ring_free);
 
 static void xhci_initialize_ring_info(struct xhci_ring *ring,
 					unsigned int cycle_state)
@@ -545,6 +546,7 @@ struct xhci_slot_ctx *xhci_get_slot_ctx(struct xhci_hcd *xhci,
 	return (struct xhci_slot_ctx *)
 		(ctx->bytes + CTX_SIZE(xhci->hcc_params));
 }
+EXPORT_SYMBOL_GPL(xhci_get_slot_ctx);
 
 struct xhci_ep_ctx *xhci_get_ep_ctx(struct xhci_hcd *xhci,
 				    struct xhci_container_ctx *ctx,
@@ -558,6 +560,7 @@ struct xhci_ep_ctx *xhci_get_ep_ctx(struct xhci_hcd *xhci,
 	return (struct xhci_ep_ctx *)
 		(ctx->bytes + (ep_index * CTX_SIZE(xhci->hcc_params)));
 }
+EXPORT_SYMBOL_GPL(xhci_get_ep_ctx);
 
 
 /***************** Streams structures manipulation *************************/
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index bfd653a1e5f6..f3b387e2fcb3 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -2717,7 +2717,7 @@ static int handle_tx_event(struct xhci_hcd *xhci,
  * Returns >0 for "possibly more events to process" (caller should call again),
  * otherwise 0 if done.  In future, <0 returns should indicate error code.
  */
-static int xhci_handle_event(struct xhci_hcd *xhci)
+int xhci_handle_event(struct xhci_hcd *xhci)
 {
 	union xhci_trb *event;
 	int update_ptrs = 1;
@@ -2786,13 +2786,14 @@ static int xhci_handle_event(struct xhci_hcd *xhci)
 	 */
 	return 1;
 }
+EXPORT_SYMBOL_GPL(xhci_handle_event);
 
 /*
  * Update Event Ring Dequeue Pointer:
  * - When all events have finished
  * - To avoid "Event Ring Full Error" condition
  */
-static void xhci_update_erst_dequeue(struct xhci_hcd *xhci,
+void xhci_update_erst_dequeue(struct xhci_hcd *xhci,
 		union xhci_trb *event_ring_deq)
 {
 	u64 temp_64;
@@ -2822,6 +2823,7 @@ static void xhci_update_erst_dequeue(struct xhci_hcd *xhci,
 	temp_64 |= ERST_EHB;
 	xhci_write_64(xhci, temp_64, &xhci->ir_set->erst_dequeue);
 }
+EXPORT_SYMBOL_GPL(xhci_update_erst_dequeue);
 
 static irqreturn_t xhci_vendor_queue_irq_work(struct xhci_hcd *xhci)
 {
-- 
2.30.0.284.gd98b1dd5eaa7-goog