diff options
Diffstat (limited to 'drivers/scsi/ibmvscsi/rpa_vscsi.c')
| -rw-r--r-- | drivers/scsi/ibmvscsi/rpa_vscsi.c | 368 |
1 files changed, 0 insertions, 368 deletions
diff --git a/drivers/scsi/ibmvscsi/rpa_vscsi.c b/drivers/scsi/ibmvscsi/rpa_vscsi.c deleted file mode 100644 index f48ae0190d95..000000000000 --- a/drivers/scsi/ibmvscsi/rpa_vscsi.c +++ /dev/null @@ -1,368 +0,0 @@ -/* ------------------------------------------------------------ - * rpa_vscsi.c - * (C) Copyright IBM Corporation 1994, 2003 - * Authors: Colin DeVilbiss (devilbis@us.ibm.com) - * Santiago Leon (santil@us.ibm.com) - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 - * USA - * - * ------------------------------------------------------------ - * RPA-specific functions of the SCSI host adapter for Virtual I/O devices - * - * This driver allows the Linux SCSI peripheral drivers to directly - * access devices in the hosting partition, either on an iSeries - * hypervisor system or a converged hypervisor system. - */ - -#include <asm/vio.h> -#include <asm/prom.h> -#include <asm/iommu.h> -#include <asm/hvcall.h> -#include <linux/delay.h> -#include <linux/dma-mapping.h> -#include <linux/gfp.h> -#include <linux/interrupt.h> -#include "ibmvscsi.h" - -static char partition_name[97] = "UNKNOWN"; -static unsigned int partition_number = -1; - -/* ------------------------------------------------------------ - * Routines for managing the command/response queue - */ -/** - * rpavscsi_handle_event: - Interrupt handler for crq events - * @irq: number of irq to handle, not used - * @dev_instance: ibmvscsi_host_data of host that received interrupt - * - * Disables interrupts and schedules srp_task - * Always returns IRQ_HANDLED - */ -static irqreturn_t rpavscsi_handle_event(int irq, void *dev_instance) -{ - struct ibmvscsi_host_data *hostdata = - (struct ibmvscsi_host_data *)dev_instance; - vio_disable_interrupts(to_vio_dev(hostdata->dev)); - tasklet_schedule(&hostdata->srp_task); - return IRQ_HANDLED; -} - -/** - * release_crq_queue: - Deallocates data and unregisters CRQ - * @queue: crq_queue to initialize and register - * @host_data: ibmvscsi_host_data of host - * - * Frees irq, deallocates a page for messages, unmaps dma, and unregisters - * the crq with the hypervisor. - */ -static void rpavscsi_release_crq_queue(struct crq_queue *queue, - struct ibmvscsi_host_data *hostdata, - int max_requests) -{ - long rc = 0; - struct vio_dev *vdev = to_vio_dev(hostdata->dev); - free_irq(vdev->irq, (void *)hostdata); - tasklet_kill(&hostdata->srp_task); - do { - if (rc) - msleep(100); - rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); - } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); - dma_unmap_single(hostdata->dev, - queue->msg_token, - queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); - free_page((unsigned long)queue->msgs); -} - -/** - * crq_queue_next_crq: - Returns the next entry in message queue - * @queue: crq_queue to use - * - * Returns pointer to next entry in queue, or NULL if there are no new - * entried in the CRQ. - */ -static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue) -{ - struct viosrp_crq *crq; - unsigned long flags; - - spin_lock_irqsave(&queue->lock, flags); - crq = &queue->msgs[queue->cur]; - if (crq->valid & 0x80) { - if (++queue->cur == queue->size) - queue->cur = 0; - } else - crq = NULL; - spin_unlock_irqrestore(&queue->lock, flags); - - return crq; -} - -/** - * rpavscsi_send_crq: - Send a CRQ - * @hostdata: the adapter - * @word1: the first 64 bits of the data - * @word2: the second 64 bits of the data - */ -static int rpavscsi_send_crq(struct ibmvscsi_host_data *hostdata, - u64 word1, u64 word2) -{ - struct vio_dev *vdev = to_vio_dev(hostdata->dev); - - return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2); -} - -/** - * rpavscsi_task: - Process srps asynchronously - * @data: ibmvscsi_host_data of host - */ -static void rpavscsi_task(void *data) -{ - struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data; - struct vio_dev *vdev = to_vio_dev(hostdata->dev); - struct viosrp_crq *crq; - int done = 0; - - while (!done) { - /* Pull all the valid messages off the CRQ */ - while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) { - ibmvscsi_handle_crq(crq, hostdata); - crq->valid = 0x00; - } - - vio_enable_interrupts(vdev); - if ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) { - vio_disable_interrupts(vdev); - ibmvscsi_handle_crq(crq, hostdata); - crq->valid = 0x00; - } else { - done = 1; - } - } -} - -static void gather_partition_info(void) -{ - struct device_node *rootdn; - - const char *ppartition_name; - const unsigned int *p_number_ptr; - - /* Retrieve information about this partition */ - rootdn = of_find_node_by_path("/"); - if (!rootdn) { - return; - } - - ppartition_name = of_get_property(rootdn, "ibm,partition-name", NULL); - if (ppartition_name) - strncpy(partition_name, ppartition_name, - sizeof(partition_name)); - p_number_ptr = of_get_property(rootdn, "ibm,partition-no", NULL); - if (p_number_ptr) - partition_number = *p_number_ptr; - of_node_put(rootdn); -} - -static void set_adapter_info(struct ibmvscsi_host_data *hostdata) -{ - memset(&hostdata->madapter_info, 0x00, - sizeof(hostdata->madapter_info)); - - dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION); - strcpy(hostdata->madapter_info.srp_version, SRP_VERSION); - - strncpy(hostdata->madapter_info.partition_name, partition_name, - sizeof(hostdata->madapter_info.partition_name)); - - hostdata->madapter_info.partition_number = partition_number; - - hostdata->madapter_info.mad_version = 1; - hostdata->madapter_info.os_type = 2; -} - -/** - * reset_crq_queue: - resets a crq after a failure - * @queue: crq_queue to initialize and register - * @hostdata: ibmvscsi_host_data of host - * - */ -static int rpavscsi_reset_crq_queue(struct crq_queue *queue, - struct ibmvscsi_host_data *hostdata) -{ - int rc = 0; - struct vio_dev *vdev = to_vio_dev(hostdata->dev); - - /* Close the CRQ */ - do { - if (rc) - msleep(100); - rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); - } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); - - /* Clean out the queue */ - memset(queue->msgs, 0x00, PAGE_SIZE); - queue->cur = 0; - - set_adapter_info(hostdata); - - /* And re-open it again */ - rc = plpar_hcall_norets(H_REG_CRQ, - vdev->unit_address, - queue->msg_token, PAGE_SIZE); - if (rc == 2) { - /* Adapter is good, but other end is not ready */ - dev_warn(hostdata->dev, "Partner adapter not ready\n"); - } else if (rc != 0) { - dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc); - } - return rc; -} - -/** - * initialize_crq_queue: - Initializes and registers CRQ with hypervisor - * @queue: crq_queue to initialize and register - * @hostdata: ibmvscsi_host_data of host - * - * Allocates a page for messages, maps it for dma, and registers - * the crq with the hypervisor. - * Returns zero on success. - */ -static int rpavscsi_init_crq_queue(struct crq_queue *queue, - struct ibmvscsi_host_data *hostdata, - int max_requests) -{ - int rc; - int retrc; - struct vio_dev *vdev = to_vio_dev(hostdata->dev); - - queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL); - - if (!queue->msgs) - goto malloc_failed; - queue->size = PAGE_SIZE / sizeof(*queue->msgs); - - queue->msg_token = dma_map_single(hostdata->dev, queue->msgs, - queue->size * sizeof(*queue->msgs), - DMA_BIDIRECTIONAL); - - if (dma_mapping_error(hostdata->dev, queue->msg_token)) - goto map_failed; - - gather_partition_info(); - set_adapter_info(hostdata); - - retrc = rc = plpar_hcall_norets(H_REG_CRQ, - vdev->unit_address, - queue->msg_token, PAGE_SIZE); - if (rc == H_RESOURCE) - /* maybe kexecing and resource is busy. try a reset */ - rc = rpavscsi_reset_crq_queue(queue, - hostdata); - - if (rc == 2) { - /* Adapter is good, but other end is not ready */ - dev_warn(hostdata->dev, "Partner adapter not ready\n"); - retrc = 0; - } else if (rc != 0) { - dev_warn(hostdata->dev, "Error %d opening adapter\n", rc); - goto reg_crq_failed; - } - - queue->cur = 0; - spin_lock_init(&queue->lock); - - tasklet_init(&hostdata->srp_task, (void *)rpavscsi_task, - (unsigned long)hostdata); - - if (request_irq(vdev->irq, - rpavscsi_handle_event, - 0, "ibmvscsi", (void *)hostdata) != 0) { - dev_err(hostdata->dev, "couldn't register irq 0x%x\n", - vdev->irq); - goto req_irq_failed; - } - - rc = vio_enable_interrupts(vdev); - if (rc != 0) { - dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc); - goto req_irq_failed; - } - - return retrc; - - req_irq_failed: - tasklet_kill(&hostdata->srp_task); - rc = 0; - do { - if (rc) - msleep(100); - rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); - } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); - reg_crq_failed: - dma_unmap_single(hostdata->dev, - queue->msg_token, - queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); - map_failed: - free_page((unsigned long)queue->msgs); - malloc_failed: - return -1; -} - -/** - * reenable_crq_queue: - reenables a crq after - * @queue: crq_queue to initialize and register - * @hostdata: ibmvscsi_host_data of host - * - */ -static int rpavscsi_reenable_crq_queue(struct crq_queue *queue, - struct ibmvscsi_host_data *hostdata) -{ - int rc = 0; - struct vio_dev *vdev = to_vio_dev(hostdata->dev); - - /* Re-enable the CRQ */ - do { - if (rc) - msleep(100); - rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address); - } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); - - if (rc) - dev_err(hostdata->dev, "Error %d enabling adapter\n", rc); - return rc; -} - -/** - * rpavscsi_resume: - resume after suspend - * @hostdata: ibmvscsi_host_data of host - * - */ -static int rpavscsi_resume(struct ibmvscsi_host_data *hostdata) -{ - vio_disable_interrupts(to_vio_dev(hostdata->dev)); - tasklet_schedule(&hostdata->srp_task); - return 0; -} - -struct ibmvscsi_ops rpavscsi_ops = { - .init_crq_queue = rpavscsi_init_crq_queue, - .release_crq_queue = rpavscsi_release_crq_queue, - .reset_crq_queue = rpavscsi_reset_crq_queue, - .reenable_crq_queue = rpavscsi_reenable_crq_queue, - .send_crq = rpavscsi_send_crq, - .resume = rpavscsi_resume, -}; |
