diff options
Diffstat (limited to 'drivers/scsi/isci/core/scic_sds_unsolicited_frame_control.c')
| -rw-r--r-- | drivers/scsi/isci/core/scic_sds_unsolicited_frame_control.c | 379 |
1 files changed, 379 insertions, 0 deletions
diff --git a/drivers/scsi/isci/core/scic_sds_unsolicited_frame_control.c b/drivers/scsi/isci/core/scic_sds_unsolicited_frame_control.c new file mode 100644 index 000000000000..7ca2f1709f6d --- /dev/null +++ b/drivers/scsi/isci/core/scic_sds_unsolicited_frame_control.c @@ -0,0 +1,379 @@ +/* + * 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. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * 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. + */ + +/** + * This file contains the implementation of the + * struct scic_sds_unsolicited_frame_control object and it's public, protected, and + * private methods. + * + * + */ + +#include "scic_sds_unsolicited_frame_control.h" +#include "scu_registers.h" +#include "scic_sds_controller.h" +#include "scic_user_callback.h" +#include "sci_util.h" +#include "sci_environment.h" + +/** + * 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. + * @uf_control: This parameter specifies the UF control object for which to + * update the address table count. + * + */ +void scic_sds_unsolicited_frame_control_set_address_table_count( + struct scic_sds_unsolicited_frame_control *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; + } +} + +/** + * 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. + * @uf_control: This parameter specifies the unsolicted frame control object + * for which to construct the unsolicited frames objects. + * @uf_buffer_phys_address: This parameter specifies the physical address for + * the first unsolicited frame buffer. + * @uf_buffer_virt_address: This parameter specifies the virtual address for + * the first unsolicited frame buffer. + * @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. + * @used_uf_header_entries: This parameter specifies the number of actually + * utilized UF headers. + * + */ +static void scic_sds_unsolicited_frame_control_construct_frames( + struct scic_sds_unsolicited_frame_control *uf_control, + dma_addr_t uf_buffer_phys_address, + unsigned long uf_buffer_virt_address, + u32 unused_uf_header_entries, + u32 used_uf_header_entries) +{ + u32 index; + struct scic_sds_unsolicited_frame *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 + ); + } +} + +/** + * This method constructs the various members of the unsolicted frame control + * object (buffers, headers, address, table, etc). + * @uf_control: This parameter specifies the unsolicited frame control object + * to construct. + * @mde: This parameter specifies the memory descriptor from which to derive + * all of the address information needed to get the unsolicited frame + * functionality working. + * @controller: This parameter specifies the controller object associated with + * the uf_control being constructed. + * + */ +void scic_sds_unsolicited_frame_control_construct( + struct scic_sds_unsolicited_frame_control *uf_control, + struct sci_physical_memory_descriptor *mde, + struct scic_sds_controller *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; + dma_addr_t 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(struct scu_unsolicited_frame_header); + used_uf_header_bytes = used_uf_header_entries + * sizeof(struct scu_unsolicited_frame_header); + + /* + * 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 + = (struct scu_unsolicited_frame_header *) + scic_cb_get_virtual_address( + controller, uf_control->headers.physical_address + ); + + /* + * 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 + = (dma_addr_t *) + scic_cb_get_virtual_address( + controller, uf_control->address_table.physical_address + ); + + 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, + (unsigned long)mde->virtual_address, + unused_uf_header_entries, + used_uf_header_entries + ); +} + +/** + * This method returns the frame header for the specified frame index. + * @uf_control: + * @frame_index: + * @frame_header: + * + * enum sci_status + */ +enum sci_status scic_sds_unsolicited_frame_control_get_header( + struct scic_sds_unsolicited_frame_control *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; +} + +/** + * This method returns the frame buffer for the specified frame index. + * @uf_control: + * @frame_index: + * @frame_buffer: + * + * enum sci_status + */ +enum sci_status scic_sds_unsolicited_frame_control_get_buffer( + struct scic_sds_unsolicited_frame_control *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; +} + +/** + * 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. + * @uf_control: This parameter specifies the UF control object + * @frame_index: This parameter specifies the frame index to attempt to release. + * + * This method returns an indication to the caller as to whether the + * unsolicited frame get pointer should be updated. true This value indicates + * the unsolicited frame get pointer should be updated (i.e. write + * SCU_UFQGP_WRITE). false This value indicates the get pointer should not be + * updated. + */ +bool scic_sds_unsolicited_frame_control_release_frame( + struct scic_sds_unsolicited_frame_control *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 (((lower_32_bits(uf_control->address_table.array[frame_get]) + == 0) && + (upper_32_bits(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. */ + BUG_ON(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; +} + |