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From:   Daehwan Jung <dh10.jung@samsung.com>
To:     Mathias Nyman <mathias.nyman@intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     linux-usb@vger.kernel.org (open list:USB XHCI DRIVER),
        linux-kernel@vger.kernel.org (open list),
        Howard Yen <howardyen@google.com>,
        Jack Pham <jackp@codeaurora.org>,
        Puma Hsu <pumahsu@google.com>,
        "J . Avila" <elavila@google.com>,
        Daehwan Jung <dh10.jung@samsung.com>, sc.suh@samsung.com
Subject: [PATCH v3 1/4] usb: host: export symbols for xhci hooks usage
Date:   Mon, 21 Mar 2022 17:59:51 +0900
Message-Id: <1647853194-62147-2-git-send-email-dh10.jung@samsung.com>
In-Reply-To: <1647853194-62147-1-git-send-email-dh10.jung@samsung.com>
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References: <1647853194-62147-1-git-send-email-dh10.jung@samsung.com>
        <CGME20220321090204epcas2p31e39a4b8b6fc803ceecac5d19e6e39e9@epcas2p3.samsung.com>
Precedence: bulk

Export symbols for xhci hooks usage:
    xhci_get_slot_ctx
    xhci_get_endpoint_address
    - 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_ring_alloc
    - Allow xhci hook to allocate vendor specific ring.

    xhci_trb_virt_to_dma
    - Used to retrieve the DMA address of vendor specific ring.

    xhci_segment_free
    xhci_link_segments
    - Allow xhci hook to handle vendor specific segment.

    xhci_initialize_ring_info
    - Allow xhci hook to initialize vendor specific ring.

    xhci_check_trb_in_td_math
    - Allow xhci hook to Check TRB math for validation.

    xhci_address_device
    - Allow override to give configuration info to Co-processor.

    xhci_bus_suspend
    xhci_bus_resume
    - Allow override of suspend and resume for power scenario.

    xhci_remove_stream_mapping
    - Allow xhci hook to remove stream mapping.

Signed-off-by: Daehwan Jung <dh10.jung@samsung.com>
Signed-off-by: Jack Pham <jackp@codeaurora.org>
Signed-off-by: Howard Yen <howardyen@google.com>
---
 drivers/usb/host/xhci-hub.c  |  2 ++
 drivers/usb/host/xhci-mem.c  | 19 +++++++++++++------
 drivers/usb/host/xhci-ring.c |  1 +
 drivers/usb/host/xhci.c      |  4 +++-
 4 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index 1e7dc130c39a..56546aaa93c7 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -1812,6 +1812,7 @@ int xhci_bus_suspend(struct usb_hcd *hcd)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(xhci_bus_suspend);
 
 /*
  * Workaround for missing Cold Attach Status (CAS) if device re-plugged in S3.
@@ -1956,6 +1957,7 @@ int xhci_bus_resume(struct usb_hcd *hcd)
 	spin_unlock_irqrestore(&xhci->lock, flags);
 	return 0;
 }
+EXPORT_SYMBOL_GPL(xhci_bus_resume);
 
 unsigned long xhci_get_resuming_ports(struct usb_hcd *hcd)
 {
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index bbb27ee2c6a3..82b9f90c0f27 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -65,7 +65,7 @@ static struct xhci_segment *xhci_segment_alloc(struct xhci_hcd *xhci,
 	return seg;
 }
 
-static void xhci_segment_free(struct xhci_hcd *xhci, struct xhci_segment *seg)
+void xhci_segment_free(struct xhci_hcd *xhci, struct xhci_segment *seg)
 {
 	if (seg->trbs) {
 		dma_pool_free(xhci->segment_pool, seg->trbs, seg->dma);
@@ -74,6 +74,7 @@ static void xhci_segment_free(struct xhci_hcd *xhci, struct xhci_segment *seg)
 	kfree(seg->bounce_buf);
 	kfree(seg);
 }
+EXPORT_SYMBOL_GPL(xhci_segment_free);
 
 static void xhci_free_segments_for_ring(struct xhci_hcd *xhci,
 				struct xhci_segment *first)
@@ -96,9 +97,9 @@ static void xhci_free_segments_for_ring(struct xhci_hcd *xhci,
  * DMA address of the next segment.  The caller needs to set any Link TRB
  * related flags, such as End TRB, Toggle Cycle, and no snoop.
  */
-static void xhci_link_segments(struct xhci_segment *prev,
-			       struct xhci_segment *next,
-			       enum xhci_ring_type type, bool chain_links)
+void xhci_link_segments(struct xhci_segment *prev,
+			struct xhci_segment *next,
+			enum xhci_ring_type type, bool chain_links)
 {
 	u32 val;
 
@@ -118,6 +119,7 @@ static void xhci_link_segments(struct xhci_segment *prev,
 		prev->trbs[TRBS_PER_SEGMENT-1].link.control = cpu_to_le32(val);
 	}
 }
+EXPORT_SYMBOL_GPL(xhci_link_segments);
 
 /*
  * Link the ring to the new segments.
@@ -256,7 +258,7 @@ static int xhci_update_stream_segment_mapping(
 	return ret;
 }
 
-static void xhci_remove_stream_mapping(struct xhci_ring *ring)
+void xhci_remove_stream_mapping(struct xhci_ring *ring)
 {
 	struct xhci_segment *seg;
 
@@ -269,6 +271,7 @@ static void xhci_remove_stream_mapping(struct xhci_ring *ring)
 		seg = seg->next;
 	} while (seg != ring->first_seg);
 }
+EXPORT_SYMBOL_GPL(xhci_remove_stream_mapping);
 
 static int xhci_update_stream_mapping(struct xhci_ring *ring, gfp_t mem_flags)
 {
@@ -316,6 +319,7 @@ void xhci_initialize_ring_info(struct xhci_ring *ring,
 	 */
 	ring->num_trbs_free = ring->num_segs * (TRBS_PER_SEGMENT - 1) - 1;
 }
+EXPORT_SYMBOL_GPL(xhci_initialize_ring_info);
 
 /* Allocate segments and link them for a ring */
 static int xhci_alloc_segments_for_ring(struct xhci_hcd *xhci,
@@ -407,6 +411,7 @@ 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,
@@ -518,6 +523,7 @@ 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,
@@ -1965,7 +1971,7 @@ static int xhci_test_trb_in_td(struct xhci_hcd *xhci,
 }
 
 /* TRB math checks for xhci_trb_in_td(), using the command and event rings. */
-static int xhci_check_trb_in_td_math(struct xhci_hcd *xhci)
+int xhci_check_trb_in_td_math(struct xhci_hcd *xhci)
 {
 	struct {
 		dma_addr_t		input_dma;
@@ -2085,6 +2091,7 @@ static int xhci_check_trb_in_td_math(struct xhci_hcd *xhci)
 	xhci_dbg(xhci, "TRB math tests passed.\n");
 	return 0;
 }
+EXPORT_SYMBOL_GPL(xhci_check_trb_in_td_math);
 
 static void xhci_set_hc_event_deq(struct xhci_hcd *xhci)
 {
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index d0b6806275e0..c6896bdab763 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)
 {
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 642610c78f58..8f53672dcd97 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1457,6 +1457,7 @@ unsigned int xhci_get_endpoint_address(unsigned int ep_index)
 	unsigned int direction = ep_index % 2 ? USB_DIR_OUT : USB_DIR_IN;
 	return direction | number;
 }
+EXPORT_SYMBOL_GPL(xhci_get_endpoint_address);
 
 /* Find the flag for this endpoint (for use in the control context).  Use the
  * endpoint index to create a bitmask.  The slot context is bit 0, endpoint 0 is
@@ -4313,10 +4314,11 @@ static int xhci_setup_device(struct usb_hcd *hcd, struct usb_device *udev,
 	return ret;
 }
 
-static int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev)
+int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev)
 {
 	return xhci_setup_device(hcd, udev, SETUP_CONTEXT_ADDRESS);
 }
+EXPORT_SYMBOL_GPL(xhci_address_device);
 
 static int xhci_enable_device(struct usb_hcd *hcd, struct usb_device *udev)
 {
-- 
2.31.1