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| Current File : //sys/dev/isci/scil/scic_sds_unsolicited_frame_control.c |
/*-
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
* The full GNU General Public License is included in this distribution
* in the file called LICENSE.GPL.
*
* BSD LICENSE
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/isci/scil/scic_sds_unsolicited_frame_control.c 231689 2012-02-14 15:58:49Z jimharris $");
/**
* @file
*
* @brief This file contains the implementation of the
* SCIC_SDS_UNSOLICITED_FRAME_CONTROL object and it's public,
* protected, and private methods.
*/
#include <dev/isci/scil/scic_sds_unsolicited_frame_control.h>
#include <dev/isci/scil/scu_registers.h>
#include <dev/isci/scil/scic_sds_controller.h>
#include <dev/isci/scil/scic_user_callback.h>
#include <dev/isci/scil/sci_util.h>
/**
* @brief The UF buffer address table size must be programmed to a power
* of 2. Find the first power of 2 that is equal to or greater then
* the number of unsolicited frame buffers to be utilized.
*
* @param[in,out] uf_control This parameter specifies the UF control
* object for which to update the address table count.
*
* @return none
*/
void scic_sds_unsolicited_frame_control_set_address_table_count(
SCIC_SDS_UNSOLICITED_FRAME_CONTROL_T *uf_control
)
{
uf_control->address_table.count = SCU_MIN_UF_TABLE_ENTRIES;
while (
(uf_control->address_table.count < uf_control->buffers.count)
&& (uf_control->address_table.count < SCU_ABSOLUTE_MAX_UNSOLICITED_FRAMES)
)
{
uf_control->address_table.count <<= 1;
}
}
/**
* @brief This method will program the unsolicited frames (UFs) into
* the UF address table and construct the UF frame structure
* being modeled in the core. It will handle the case where
* some of the UFs are not being used and thus should have
* entries programmed to zero in the address table.
*
* @param[in,out] uf_control This parameter specifies the unsolicted
* frame control object for which to construct the
* unsolicited frames objects.
* @param[in] uf_buffer_phys_address This parameter specifies the
* physical address for the first unsolicited frame
* buffer.
* @param[in] uf_buffer_virt_address This parameter specifies the
* virtual address for the first unsolicited frame
* buffer.
* @param[in] unused_uf_header_entries This parameter specifies
* the number of unused UF headers. This value can
* be non-zero when there are a non-power of 2 number
* of unsolicited frames being supported.
* @param[in] used_uf_header_entries This parameter specifies
* the number of actually utilized UF headers.
*
* @return none
*/
static
void scic_sds_unsolicited_frame_control_construct_frames(
SCIC_SDS_UNSOLICITED_FRAME_CONTROL_T *uf_control,
SCI_PHYSICAL_ADDRESS uf_buffer_phys_address,
POINTER_UINT uf_buffer_virt_address,
U32 unused_uf_header_entries,
U32 used_uf_header_entries
)
{
U32 index;
SCIC_SDS_UNSOLICITED_FRAME_T *uf;
// Program the unused buffers into the UF address table and the
// controller's array of UFs.
for (index = 0; index < unused_uf_header_entries; index++)
{
uf = &uf_control->buffers.array[index];
sci_cb_make_physical_address(
uf_control->address_table.array[index], 0, 0
);
uf->buffer = NULL;
uf->header = &uf_control->headers.array[index];
uf->state = UNSOLICITED_FRAME_EMPTY;
}
// Program the actual used UF buffers into the UF address table and
// the controller's array of UFs.
for (index = unused_uf_header_entries;
index < unused_uf_header_entries + used_uf_header_entries;
index++)
{
uf = &uf_control->buffers.array[index];
uf_control->address_table.array[index] = uf_buffer_phys_address;
uf->buffer = (void*) uf_buffer_virt_address;
uf->header = &uf_control->headers.array[index];
uf->state = UNSOLICITED_FRAME_EMPTY;
// Increment the address of the physical and virtual memory pointers
// Everything is aligned on 1k boundary with an increment of 1k
uf_buffer_virt_address += SCU_UNSOLICITED_FRAME_BUFFER_SIZE;
sci_physical_address_add(
uf_buffer_phys_address, SCU_UNSOLICITED_FRAME_BUFFER_SIZE
);
}
}
/**
* @brief This method constructs the various members of the unsolicted
* frame control object (buffers, headers, address, table, etc).
*
* @param[in,out] uf_control This parameter specifies the unsolicited
* frame control object to construct.
* @param[in] mde This parameter specifies the memory descriptor
* from which to derive all of the address information
* needed to get the unsolicited frame functionality
* working.
* @param[in] controller This parameter specifies the controller
* object associated with the uf_control being constructed.
*
* @return none
*/
void scic_sds_unsolicited_frame_control_construct(
SCIC_SDS_UNSOLICITED_FRAME_CONTROL_T *uf_control,
SCI_PHYSICAL_MEMORY_DESCRIPTOR_T *mde,
SCIC_SDS_CONTROLLER_T *controller
)
{
U32 unused_uf_header_entries;
U32 used_uf_header_entries;
U32 used_uf_buffer_bytes;
U32 unused_uf_header_bytes;
U32 used_uf_header_bytes;
SCI_PHYSICAL_ADDRESS uf_buffer_phys_address;
// Prepare all of the memory sizes for the UF headers, UF address
// table, and UF buffers themselves.
used_uf_buffer_bytes = uf_control->buffers.count
* SCU_UNSOLICITED_FRAME_BUFFER_SIZE;
unused_uf_header_entries = uf_control->address_table.count
- uf_control->buffers.count;
used_uf_header_entries = uf_control->buffers.count;
unused_uf_header_bytes = unused_uf_header_entries
* sizeof(SCU_UNSOLICITED_FRAME_HEADER_T);
used_uf_header_bytes = used_uf_header_entries
* sizeof(SCU_UNSOLICITED_FRAME_HEADER_T);
// The Unsolicited Frame buffers are set at the start of the UF
// memory descriptor entry. The headers and address table will be
// placed after the buffers.
uf_buffer_phys_address = mde->physical_address;
// Program the location of the UF header table into the SCU.
// Notes:
// - The address must align on a 64-byte boundary. Guaranteed to be
// on 64-byte boundary already 1KB boundary for unsolicited frames.
// - Program unused header entries to overlap with the last
// unsolicited frame. The silicon will never DMA to these unused
// headers, since we program the UF address table pointers to
// NULL.
uf_control->headers.physical_address = uf_buffer_phys_address;
sci_physical_address_add(
uf_control->headers.physical_address, used_uf_buffer_bytes);
sci_physical_address_subtract(
uf_control->headers.physical_address, unused_uf_header_bytes);
uf_control->headers.array = (SCU_UNSOLICITED_FRAME_HEADER_T*)
((U8 *)mde->virtual_address + used_uf_buffer_bytes - unused_uf_header_bytes);
// Program the location of the UF address table into the SCU.
// Notes:
// - The address must align on a 64-bit boundary. Guaranteed to be on 64
// byte boundary already due to above programming headers being on a
// 64-bit boundary and headers are on a 64-bytes in size.
uf_control->address_table.physical_address = uf_buffer_phys_address;
sci_physical_address_add(
uf_control->address_table.physical_address, used_uf_buffer_bytes);
sci_physical_address_add(
uf_control->address_table.physical_address, used_uf_header_bytes);
uf_control->address_table.array = (SCI_PHYSICAL_ADDRESS*)
((U8 *)mde->virtual_address + used_uf_buffer_bytes + used_uf_header_bytes);
uf_control->get = 0;
// UF buffer requirements are:
// - The last entry in the UF queue is not NULL.
// - There is a power of 2 number of entries (NULL or not-NULL)
// programmed into the queue.
// - Aligned on a 1KB boundary.
// If the user provided less then the maximum amount of memory,
// then be sure that we programm the first entries in the UF
// address table to NULL.
scic_sds_unsolicited_frame_control_construct_frames(
uf_control,
uf_buffer_phys_address,
(POINTER_UINT) mde->virtual_address,
unused_uf_header_entries,
used_uf_header_entries
);
}
/**
* @brief This method returns the frame header for the specified frame
* index.
*
* @param[in] uf_control
* @param[in] frame_index
* @param[out] frame_header
*
* @return SCI_STATUS
*/
SCI_STATUS scic_sds_unsolicited_frame_control_get_header(
SCIC_SDS_UNSOLICITED_FRAME_CONTROL_T *uf_control,
U32 frame_index,
void **frame_header
)
{
if (frame_index < uf_control->address_table.count)
{
// Skip the first word in the frame since this is a controll word used
// by the hardware.
*frame_header = &uf_control->buffers.array[frame_index].header->data;
return SCI_SUCCESS;
}
return SCI_FAILURE_INVALID_PARAMETER_VALUE;
}
/**
* @brief This method returns the frame buffer for the specified frame
* index.
*
* @param[in] uf_control
* @param[in] frame_index
* @param[out] frame_buffer
*
* @return SCI_STATUS
*/
SCI_STATUS scic_sds_unsolicited_frame_control_get_buffer(
SCIC_SDS_UNSOLICITED_FRAME_CONTROL_T *uf_control,
U32 frame_index,
void **frame_buffer
)
{
if (frame_index < uf_control->address_table.count)
{
*frame_buffer = uf_control->buffers.array[frame_index].buffer;
return SCI_SUCCESS;
}
return SCI_FAILURE_INVALID_PARAMETER_VALUE;
}
/**
* @brief This method releases the frame once this is done the frame is
* available for re-use by the hardware. The data contained in the
* frame header and frame buffer is no longer valid.
*
* @param[in] uf_control This parameter specifies the UF control object
* @param[in] frame_index This parameter specifies the frame index to
* attempt to release.
*
* @return This method returns an indication to the caller as to whether
* the unsolicited frame get pointer should be updated.
* @retval TRUE This value indicates the unsolicited frame get pointer
* should be updated (i.e. write SCU_UFQGP_WRITE).
* @retval FALSE This value indicates the get pointer should not be
* updated.
*/
BOOL scic_sds_unsolicited_frame_control_release_frame(
SCIC_SDS_UNSOLICITED_FRAME_CONTROL_T *uf_control,
U32 frame_index
)
{
U32 frame_get;
U32 frame_cycle;
frame_get = uf_control->get & (uf_control->address_table.count - 1);
frame_cycle = uf_control->get & uf_control->address_table.count;
// In the event there are NULL entries in the UF table, we need to
// advance the get pointer in order to find out if this frame should
// be released (i.e. update the get pointer).
while (
(
(sci_cb_physical_address_lower(
uf_control->address_table.array[frame_get]) == 0)
&& (sci_cb_physical_address_upper(
uf_control->address_table.array[frame_get]) == 0)
)
&& (frame_get < uf_control->address_table.count)
)
{
frame_get++;
}
// The table has a NULL entry as it's last element. This is
// illegal.
ASSERT(frame_get < uf_control->address_table.count);
if (frame_index < uf_control->address_table.count)
{
uf_control->buffers.array[frame_index].state = UNSOLICITED_FRAME_RELEASED;
// The frame index is equal to the current get pointer so we
// can now free up all of the frame entries that
if (frame_get == frame_index)
{
while (
uf_control->buffers.array[frame_get].state
== UNSOLICITED_FRAME_RELEASED
)
{
uf_control->buffers.array[frame_get].state = UNSOLICITED_FRAME_EMPTY;
INCREMENT_QUEUE_GET(
frame_get,
frame_cycle,
uf_control->address_table.count - 1,
uf_control->address_table.count
);
}
uf_control->get =
(SCU_UFQGP_GEN_BIT(ENABLE_BIT) | frame_cycle | frame_get);
return TRUE;
}
else
{
// Frames remain in use until we advance the get pointer
// so there is nothing we can do here
}
}
return FALSE;
}