[v7,0/5] Re-introduce TX FIFO resize for larger EP bursting

Message

Wesley Cheng Jan. 29, 2021, 4:46 a.m. UTC

Changes in V7:
 - Added a new property tx-fifo-max-num for limiting how much fifo space the
   resizing logic can allocate for endpoints with large burst values.  This
   can differ across platforms, and tie in closely with overall system latency.
 - Added recommended checks for DWC32.
 - Added changes to set the tx-fifo-resize property from dwc3-qcom by default
   instead of modifying the current DTSI files.
 - Added comments on all APIs/variables introduced.
 - Updated the DWC3 YAML to include a better description of the tx-fifo-resize
   property and added an entry for tx-fifo-max-num.

Changes in V6:
 - Rebased patches to usb-testing.
 - Renamed to PATCH series instead of RFC.
 - Checking for fs_descriptors instead of ss_descriptors for determining the
   endpoint count for a particular configuration.
 - Re-ordered patch series to fix patch dependencies.

Changes in V5:
 - Added check_config() logic, which is used to communicate the number of EPs
   used in a particular configuration.  Based on this, the DWC3 gadget driver
   has the ability to know the maximum number of eps utilized in all configs.
   This helps reduce unnecessary allocation to unused eps, and will catch fifo
   allocation issues at bind() time.
 - Fixed variable declaration to single line per variable, and reverse xmas.
 - Created a helper for fifo clearing, which is used by ep0.c

Changes in V4:
 - Removed struct dwc3* as an argument for dwc3_gadget_resize_tx_fifos()
 - Removed WARN_ON(1) in case we run out of fifo space
 
Changes in V3:
 - Removed "Reviewed-by" tags
 - Renamed series back to RFC
 - Modified logic to ensure that fifo_size is reset if we pass the minimum
   threshold.  Tested with binding multiple FDs requesting 6 FIFOs.

Changes in V2:
 - Modified TXFIFO resizing logic to ensure that each EP is reserved a
   FIFO.
 - Removed dev_dbg() prints and fixed typos from patches
 - Added some more description on the dt-bindings commit message

Currently, there is no functionality to allow for resizing the TXFIFOs, and
relying on the HW default setting for the TXFIFO depth.  In most cases, the
HW default is probably sufficient, but for USB compositions that contain
multiple functions that require EP bursting, the default settings
might not be enough.  Also to note, the current SW will assign an EP to a
function driver w/o checking to see if the TXFIFO size for that particular
EP is large enough. (this is a problem if there are multiple HW defined
values for the TXFIFO size)

It is mentioned in the SNPS databook that a minimum of TX FIFO depth = 3
is required for an EP that supports bursting.  Otherwise, there may be
frequent occurences of bursts ending.  For high bandwidth functions,
such as data tethering (protocols that support data aggregation), mass
storage, and media transfer protocol (over FFS), the bMaxBurst value can be
large, and a bigger TXFIFO depth may prove to be beneficial in terms of USB
throughput. (which can be associated to system access latency, etc...)  It
allows for a more consistent burst of traffic, w/o any interruptions, as
data is readily available in the FIFO.

With testing done using the mass storage function driver, the results show
that with a larger TXFIFO depth, the bandwidth increased significantly.

Test Parameters:
 - Platform: Qualcomm SM8150
 - bMaxBurst = 6
 - USB req size = 256kB
 - Num of USB reqs = 16
 - USB Speed = Super-Speed
 - Function Driver: Mass Storage (w/ ramdisk)
 - Test Application: CrystalDiskMark

Results:

TXFIFO Depth = 3 max packets

Test Case | Data Size | AVG tput (in MB/s)
-------------------------------------------
Sequential|1 GB x     | 
Read      |9 loops    | 193.60
	  |           | 195.86
          |           | 184.77
          |           | 193.60
-------------------------------------------

TXFIFO Depth = 6 max packets

Test Case | Data Size | AVG tput (in MB/s)
-------------------------------------------
Sequential|1 GB x     | 
Read      |9 loops    | 287.35
	  |           | 304.94
          |           | 289.64
          |           | 293.61
-------------------------------------------

Wesley Cheng (5):
  usb: gadget: udc: core: Introduce check_config to verify USB
    configuration
  usb: gadget: configfs: Check USB configuration before adding
  usb: dwc3: Resize TX FIFOs to meet EP bursting requirements
  usb: dwc3: dwc3-qcom: Enable tx-fifo-resize property by default
  dt-bindings: usb: dwc3: Update dwc3 TX fifo properties

 .../devicetree/bindings/usb/snps,dwc3.yaml         |  15 +-
 drivers/usb/dwc3/core.c                            |   9 +
 drivers/usb/dwc3/core.h                            |  15 ++
 drivers/usb/dwc3/dwc3-qcom.c                       |  10 +
 drivers/usb/dwc3/ep0.c                             |   2 +
 drivers/usb/dwc3/gadget.c                          | 214 +++++++++++++++++++++
 drivers/usb/gadget/configfs.c                      |  22 +++
 drivers/usb/gadget/udc/core.c                      |  25 +++
 include/linux/usb/gadget.h                         |   5 +
 9 files changed, 315 insertions(+), 2 deletions(-)