From 7c78da3175177c905a75c54b5830029c778494ea Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 1 Jun 2011 16:00:01 -0700 Subject: isci: remove 'min memory' infrastructure The old 'core' had aspirations of running in severely memory constrained environments like bios option-rom, it's not needed for Linux and gets in the way of other cleanups (like unifying/reducing the number of structure members in scic_sds_controller/isci_host). This also fixes a theoretical bug in that the driver would blindly override the silicon advertised limits for number of ports, task contexts, and remote node contexts. Signed-off-by: Dan Williams --- drivers/scsi/isci/unsolicited_frame_control.c | 186 ++++++-------------------- 1 file changed, 44 insertions(+), 142 deletions(-) (limited to 'drivers/scsi/isci/unsolicited_frame_control.c') diff --git a/drivers/scsi/isci/unsolicited_frame_control.c b/drivers/scsi/isci/unsolicited_frame_control.c index 12e6763..d895707 100644 --- a/drivers/scsi/isci/unsolicited_frame_control.c +++ b/drivers/scsi/isci/unsolicited_frame_control.c @@ -57,120 +57,30 @@ #include "unsolicited_frame_control.h" #include "registers.h" -/** - * 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, - void *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]; - - uf->buffer = NULL; - uf_control->address_table.array[index] = 0; - 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 = 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; - uf_buffer_phys_address += SCU_UNSOLICITED_FRAME_BUFFER_SIZE; - } -} - int scic_sds_unsolicited_frame_control_construct(struct scic_sds_controller *scic) { struct scic_sds_unsolicited_frame_control *uf_control = &scic->uf_control; - 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; - void *uf_buffer_virt_address; + struct scic_sds_unsolicited_frame *uf; + u32 buf_len, header_len, i; + dma_addr_t dma; size_t size; - - /* - * 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->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; + void *virt; /* * 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); - - size = used_uf_buffer_bytes + used_uf_header_bytes + - uf_control->address_table.count * sizeof(dma_addr_t); - + buf_len = SCU_MAX_UNSOLICITED_FRAMES * SCU_UNSOLICITED_FRAME_BUFFER_SIZE; + header_len = SCU_MAX_UNSOLICITED_FRAMES * sizeof(struct scu_unsolicited_frame_header); + size = buf_len + header_len + SCU_MAX_UNSOLICITED_FRAMES * sizeof(dma_addr_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_virt_address = dmam_alloc_coherent(scic_to_dev(scic), size, - &uf_buffer_phys_address, GFP_KERNEL); - if (!uf_buffer_virt_address) + virt = dmam_alloc_coherent(scic_to_dev(scic), size, &dma, GFP_KERNEL); + if (!virt) return -ENOMEM; /* @@ -183,15 +93,8 @@ int scic_sds_unsolicited_frame_control_construct(struct scic_sds_controller *sci * headers, since we program the UF address table pointers to * NULL. */ - uf_control->headers.physical_address = - uf_buffer_phys_address + - used_uf_buffer_bytes - - unused_uf_header_bytes; - - uf_control->headers.array = - uf_buffer_virt_address + - used_uf_buffer_bytes - - unused_uf_header_bytes; + uf_control->headers.physical_address = dma + buf_len; + uf_control->headers.array = virt + buf_len; /* * Program the location of the UF address table into the SCU. @@ -200,16 +103,8 @@ int scic_sds_unsolicited_frame_control_construct(struct scic_sds_controller *sci * 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 + - used_uf_buffer_bytes + - used_uf_header_bytes; - - uf_control->address_table.array = - uf_buffer_virt_address + - used_uf_buffer_bytes + - used_uf_header_bytes; - + uf_control->address_table.physical_address = dma + buf_len + header_len; + uf_control->address_table.array = virt + buf_len + header_len; uf_control->get = 0; /* @@ -220,16 +115,26 @@ int scic_sds_unsolicited_frame_control_construct(struct scic_sds_controller *sci * - 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, - uf_buffer_virt_address, - unused_uf_header_entries, - used_uf_header_entries - ); + * Program the actual used UF buffers into the UF address table and + * the controller's array of UFs. + */ + for (i = 0; i < SCU_MAX_UNSOLICITED_FRAMES; i++) { + uf = &uf_control->buffers.array[i]; + + uf_control->address_table.array[i] = dma; + + uf->buffer = virt; + uf->header = &uf_control->headers.array[i]; + 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. + */ + virt += SCU_UNSOLICITED_FRAME_BUFFER_SIZE; + dma += SCU_UNSOLICITED_FRAME_BUFFER_SIZE; + } return 0; } @@ -247,7 +152,7 @@ enum sci_status scic_sds_unsolicited_frame_control_get_header( u32 frame_index, void **frame_header) { - if (frame_index < uf_control->address_table.count) { + if (frame_index < SCU_MAX_UNSOLICITED_FRAMES) { /* * Skip the first word in the frame since this is a controll word used * by the hardware. */ @@ -272,7 +177,7 @@ enum sci_status scic_sds_unsolicited_frame_control_get_buffer( u32 frame_index, void **frame_buffer) { - if (frame_index < uf_control->address_table.count) { + if (frame_index < SCU_MAX_UNSOLICITED_FRAMES) { *frame_buffer = uf_control->buffers.array[frame_index].buffer; return SCI_SUCCESS; @@ -298,26 +203,24 @@ bool scic_sds_unsolicited_frame_control_release_frame( 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; + frame_get = uf_control->get & (SCU_MAX_UNSOLICITED_FRAMES - 1); + frame_cycle = uf_control->get & SCU_MAX_UNSOLICITED_FRAMES; /* * 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)) + 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 < SCU_MAX_UNSOLICITED_FRAMES) 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); + BUG_ON(frame_get >= SCU_MAX_UNSOLICITED_FRAMES); - if (frame_index < uf_control->address_table.count) { + if (frame_index < SCU_MAX_UNSOLICITED_FRAMES) { uf_control->buffers.array[frame_index].state = UNSOLICITED_FRAME_RELEASED; /* @@ -333,9 +236,8 @@ bool scic_sds_unsolicited_frame_control_release_frame( INCREMENT_QUEUE_GET( frame_get, frame_cycle, - uf_control->address_table.count - 1, - uf_control->address_table.count - ); + SCU_MAX_UNSOLICITED_FRAMES - 1, + SCU_MAX_UNSOLICITED_FRAMES); } uf_control->get = -- cgit v1.1