diff options
| author | Elric Fu <elricfu1@gmail.com> | 2012-06-27 16:31:12 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-07 08:32:26 -0700 |
| commit | 2818247b6565b7adfbcd53b74509448a8e1fad84 (patch) | |
| tree | 606c886cf719aac07beea71f1e1f95a7f5b41e75 /drivers/usb/host/xhci.h | |
| parent | 1976fffe9dc839e9d25c903a65723600f7641a50 (diff) | |
xHCI: add aborting command ring function
commit b92cc66c047ff7cf587b318fe377061a353c120f upstream.
Software have to abort command ring and cancel command
when a command is failed or hang. Otherwise, the command
ring will hang up and can't handle the others. An example
of a command that may hang is the Address Device Command,
because waiting for a SET_ADDRESS request to be acknowledged
by a USB device is outside of the xHC's ability to control.
To cancel a command, software will initialize a command
descriptor for the cancel command, and add it into a
cancel_cmd_list of xhci.
Sarah: Fixed missing newline on "Have the command ring been stopped?"
debugging statement.
This patch should be backported to kernels as old as 3.0, that contain
the commit 7ed603ecf8b68ab81f4c83097d3063d43ec73bb8 "xhci: Add an
assertion to check for virt_dev=0 bug." That commit papers over a NULL
pointer dereference, and this patch fixes the underlying issue that
caused the NULL pointer dereference.
Signed-off-by: Elric Fu <elricfu1@gmail.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Tested-by: Miroslav Sabljic <miroslav.sabljic@avl.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/xhci.h')
| -rw-r--r-- | drivers/usb/host/xhci.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 75722b70bba..6456a56e6d2 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1252,6 +1252,13 @@ struct xhci_td { union xhci_trb *last_trb; }; +/* command descriptor */ +struct xhci_cd { + struct list_head cancel_cmd_list; + struct xhci_command *command; + union xhci_trb *cmd_trb; +}; + struct xhci_dequeue_state { struct xhci_segment *new_deq_seg; union xhci_trb *new_deq_ptr; @@ -1421,6 +1428,7 @@ struct xhci_hcd { #define CMD_RING_STATE_RUNNING (1 << 0) #define CMD_RING_STATE_ABORTED (1 << 1) #define CMD_RING_STATE_STOPPED (1 << 2) + struct list_head cancel_cmd_list; unsigned int cmd_ring_reserved_trbs; struct xhci_ring *event_ring; struct xhci_erst erst; @@ -1699,6 +1707,8 @@ static inline void xhci_unregister_plat(void) /* xHCI host controller glue */ typedef void (*xhci_get_quirks_t)(struct device *, struct xhci_hcd *); +int handshake(struct xhci_hcd *xhci, void __iomem *ptr, + u32 mask, u32 done, int usec); void xhci_quiesce(struct xhci_hcd *xhci); int xhci_halt(struct xhci_hcd *xhci); int xhci_reset(struct xhci_hcd *xhci); @@ -1789,6 +1799,8 @@ void xhci_queue_config_ep_quirk(struct xhci_hcd *xhci, unsigned int slot_id, unsigned int ep_index, struct xhci_dequeue_state *deq_state); void xhci_stop_endpoint_command_watchdog(unsigned long arg); +int xhci_cancel_cmd(struct xhci_hcd *xhci, struct xhci_command *command, + union xhci_trb *cmd_trb); void xhci_ring_ep_doorbell(struct xhci_hcd *xhci, unsigned int slot_id, unsigned int ep_index, unsigned int stream_id); |