[PATCH v1 1/4] usb: host: export symbols for xhci hooks usage

Daehwan Jung
2022-03-04T06:33:18Z

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.

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

xhci_segment_free
- Free a segment struct.

xhci_link_segments
- Make the prev segment point to the next segment.

xhci_initialize_ring_info
- Initialize a ring struct.

xhci_check_trb_in_td_math
- Check TRB math for validation.

xhci_get_endpoint_address
- Get endpoint address from endpoint index.

xhci_address_device
- Issue an address device command

xhci_bus_suspend
xhci_bus_resume
- Suspend and resume for power scenario

xhci_remove_stream_mapping
- Remove stream mapping in stream endpoint

xhci_remove_segment_mapping
- Remove segment mapping

Signed-off-by: Daehwan Jung <dh10.jung@samsung.com>
---
drivers/usb/host/xhci-hub.c | 2 ++
drivers/usb/host/xhci-mem.c | 29 +++++++++++++++++++++--------
drivers/usb/host/xhci-ring.c | 9 +++++++--
drivers/usb/host/xhci.c | 4 +++-
4 files changed, 33 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index df3522dab31b..6c1b8d748d0f 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -1809,6 +1809,7 @@ 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.
@@ -1953,6 +1954,7 @@ 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 0e312066c5c6..e6d56ef91ddb 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);
@@ -74,8 +74,9 @@ 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,
+void xhci_free_segments_for_ring(struct xhci_hcd *xhci,
struct xhci_segment *first)
{
struct xhci_segment *seg;
@@ -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.
@@ -206,7 +208,7 @@ static int xhci_insert_segment_mapping(struct radix_tree_root *trb_address_map,
return ret;
}

-static void xhci_remove_segment_mapping(struct radix_tree_root *trb_address_map,
+void xhci_remove_segment_mapping(struct radix_tree_root *trb_address_map,
struct xhci_segment *seg)
{
unsigned long key;
@@ -215,6 +217,7 @@ static void xhci_remove_segment_mapping(struct radix_tree_root *trb_address_map,
if (radix_tree_lookup(trb_address_map, key))
radix_tree_delete(trb_address_map, key);
}
+EXPORT_SYMBOL_GPL(xhci_remove_segment_mapping);

static int xhci_update_stream_segment_mapping(
struct radix_tree_root *trb_address_map,
@@ -256,7 +259,7 @@ 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 +272,7 @@ 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)
{
@@ -292,6 +296,7 @@ void xhci_ring_free(struct xhci_hcd *xhci, struct xhci_ring *ring)

kfree(ring);
}
+EXPORT_SYMBOL_GPL(xhci_ring_free);

void xhci_initialize_ring_info(struct xhci_ring *ring,
unsigned int cycle_state)
@@ -316,6 +321,7 @@ 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 +413,7 @@ 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,
@@ -519,6 +526,7 @@ 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,
@@ -1755,6 +1763,7 @@ 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)
@@ -1788,6 +1797,7 @@ 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,
@@ -1818,6 +1828,7 @@ 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)
{
@@ -1831,6 +1842,7 @@ 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);

void xhci_mem_cleanup(struct xhci_hcd *xhci)
{
@@ -1969,7 +1981,7 @@ 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;
@@ -2089,6 +2101,7 @@ 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..2e99393560e5 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)
{
@@ -2965,7 +2967,7 @@ 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;
@@ -3034,13 +3036,14 @@ 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;
@@ -3070,6 +3073,7 @@ 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);

/*
* xHCI spec says we can get an interrupt, and if the HC has an error condition,
@@ -4420,6 +4424,7 @@ 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,
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index dc357cabb265..041a65a6f175 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1449,6 +1449,7 @@ 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
@@ -4306,10 +4307,11 @@ 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