From 6c997d153d7c1e11d51aeb1b7c46002d5daa760b Mon Sep 17 00:00:00 2001
From: Jack Pham <jackp@codeaurora.org>
Date: Wed, 10 Mar 2021 00:27:11 -0800
Subject: [PATCH] ANDROID: usb: host: export additional xhci symbols for ring
 management

Export the following xhci symbols which will allow vendor modules
to perform their own ring management. These will be used to create
and manage additional secondary rings that are used to offload to a
separate coprocessor which interacts with the xHC controller.

xhci_ring_alloc
    - Allocate a struct xhci_ring.

xhci_alloc_erst
xhci_free_erst
    - Allocate and free event ring segment tables.

xhci_trb_virt_to_dma
    - Used to retrieve the DMA address of a TRB

xhci_ring_cmd_db
    - Notify the controller when a new command is issued

xhci_alloc_command
xhci_free_command
    - Allocate and free a struct xhci_command

xhci_queue_stop_endpoint
    - Issue a stop endpoint command to the controller

Bug: 182336717
Change-Id: I9d4c5884108e656e890aca8137d4ef580bcd7a12
Signed-off-by: Jack Pham <jackp@codeaurora.org>
---
 drivers/usb/host/xhci-mem.c  | 5 +++++
 drivers/usb/host/xhci-ring.c | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 177d4bf7fb0b..a5f7aa7d5c12 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -439,6 +439,7 @@ struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci,
 	kfree(ring);
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(xhci_ring_alloc);
 
 void xhci_free_endpoint_ring(struct xhci_hcd *xhci,
 		struct xhci_virt_device *virt_dev,
@@ -1801,6 +1802,7 @@ struct xhci_command *xhci_alloc_command(struct xhci_hcd *xhci,
 	INIT_LIST_HEAD(&command->cmd_list);
 	return command;
 }
+EXPORT_SYMBOL_GPL(xhci_alloc_command);
 
 struct xhci_command *xhci_alloc_command_with_ctx(struct xhci_hcd *xhci,
 		bool allocate_completion, gfp_t mem_flags)
@@ -1834,6 +1836,7 @@ void xhci_free_command(struct xhci_hcd *xhci,
 	kfree(command->completion);
 	kfree(command);
 }
+EXPORT_SYMBOL_GPL(xhci_free_command);
 
 int xhci_alloc_erst(struct xhci_hcd *xhci,
 		    struct xhci_ring *evt_ring,
@@ -1864,6 +1867,7 @@ int xhci_alloc_erst(struct xhci_hcd *xhci,
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(xhci_alloc_erst);
 
 void xhci_free_erst(struct xhci_hcd *xhci, struct xhci_erst *erst)
 {
@@ -1877,6 +1881,7 @@ void xhci_free_erst(struct xhci_hcd *xhci, struct xhci_erst *erst)
 				erst->erst_dma_addr);
 	erst->entries = NULL;
 }
+EXPORT_SYMBOL_GPL(xhci_free_erst);
 
 static struct xhci_device_context_array *xhci_vendor_alloc_dcbaa(
 		struct xhci_hcd *xhci, gfp_t flags)
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 90a36b145e67..81cc26e0925d 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -79,6 +79,7 @@ dma_addr_t xhci_trb_virt_to_dma(struct xhci_segment *seg,
 		return 0;
 	return seg->dma + (segment_offset * sizeof(*trb));
 }
+EXPORT_SYMBOL_GPL(xhci_trb_virt_to_dma);
 
 static bool trb_is_noop(union xhci_trb *trb)
 {
@@ -311,6 +312,7 @@ void xhci_ring_cmd_db(struct xhci_hcd *xhci)
 	/* Flush PCI posted writes */
 	readl(&xhci->dba->doorbell[0]);
 }
+EXPORT_SYMBOL_GPL(xhci_ring_cmd_db);
 
 static bool xhci_mod_cmd_timer(struct xhci_hcd *xhci, unsigned long delay)
 {
@@ -4361,6 +4363,7 @@ int xhci_queue_stop_endpoint(struct xhci_hcd *xhci, struct xhci_command *cmd,
 	return queue_command(xhci, cmd, 0, 0, 0,
 			trb_slot_id | trb_ep_index | type | trb_suspend, false);
 }
+EXPORT_SYMBOL_GPL(xhci_queue_stop_endpoint);
 
 int xhci_queue_reset_ep(struct xhci_hcd *xhci, struct xhci_command *cmd,
 			int slot_id, unsigned int ep_index,