[PATCH v5 1/6] usb: host: export symbols for xhci-exynos to use xhci hooks

Daehwan Jung
2022-05-06T06:33:47Z

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. Vendors could
alloc additional event ring.

xhci_trb_virt_to_dma
- Used to retrieve the DMA address of vendor specific ring. Vendors
could get dequeue address of event ring.

xhci_segment_free
xhci_link_segments
- Allow xhci hook to handle vendor specific segment. Vendors could
directly free or link segments of vendor specific ring.

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. Vendors could
check trb when allocating vendor specific ring.

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 to xhci hook to remove stream mapping. Vendors need to do it
when free-ing vendor specific ring if it's stream type.

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 +++-
drivers/usb/host/xhci.h | 7 +++++++
5 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index f65f1ba2b592..841617952ac7 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 f9707997969d..652b37cd9c5e 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 25b87e99b4dd..c06e8b21b724 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1468,6 +1468,7 @@ 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
@@ -4324,10 +4325,11 @@ 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)
{
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 473a33ce299e..5316841e9b26 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -2054,6 +2054,11 @@ void xhci_free_erst(struct xhci_hcd *xhci, struct xhci_erst *erst);
void xhci_free_endpoint_ring(struct xhci_hcd *xhci,
struct xhci_virt_device *virt_dev,
unsigned int ep_index);
+void xhci_segment_free(struct xhci_hcd *xhci, struct xhci_segment *seg);
+void xhci_link_segments(struct xhci_segment *prev,
+ struct xhci_segment *next,
+ enum xhci_ring_type type, bool chain_links);
+void xhci_remove_stream_mapping(struct xhci_ring *ring);
struct xhci_stream_info *xhci_alloc_stream_info(struct xhci_hcd *xhci,
unsigned int num_stream_ctxs,
unsigned int num_streams,
@@ -2100,6 +2105,7 @@ int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
struct usb_host_endpoint *ep);
int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev);
void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev);
+int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev);
int xhci_disable_slot(struct xhci_hcd *xhci, u32 slot_id);
int xhci_ext_cap_init(struct xhci_hcd *xhci);

@@ -2116,6 +2122,7 @@ int xhci_alloc_tt_info(struct xhci_hcd *xhci,

/* xHCI ring, segment, TRB, and TD functions */
dma_addr_t xhci_trb_virt_to_dma(struct xhci_segment *seg, union xhci_trb *trb);
+int xhci_check_trb_in_td_math(struct xhci_hcd *xhci);
struct xhci_segment *trb_in_td(struct xhci_hcd *xhci,
struct xhci_segment *start_seg, union xhci_trb *start_trb,
union xhci_trb *end_trb, dma_addr_t suspect_dma, bool debug);
--
2.31.1