OSCL-LXR linux-6.0.1/​drivers/​s390/​net/​ism_drv.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0
 /*
  * ISM driver for s390.
  *
  * Copyright IBM Corp. 2018
  */
 #define KMSG_COMPONENT "ism"
 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
 
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/interrupt.h>
 #include <linux/device.h>
 #include <linux/pci.h>
 #include <linux/err.h>
 #include <linux/ctype.h>
 #include <linux/processor.h>
 #include <net/smc.h>
 
 #include <asm/debug.h>
 
 #include "ism.h"
 
 MODULE_DESCRIPTION("ISM driver for s390");
 MODULE_LICENSE("GPL");
 
 #define PCI_DEVICE_ID_IBM_ISM 0x04ED
 #define DRV_NAME "ism"
 
 static const struct pci_device_id ism_device_table[] = {
     { PCI_VDEVICE(IBM, PCI_DEVICE_ID_IBM_ISM), 0 },
     { 0, }
 };
 MODULE_DEVICE_TABLE(pci, ism_device_table);
 
 static debug_info_t *ism_debug_info;
 
 static int ism_cmd(struct ism_dev *ism, void *cmd)
 {
     struct ism_req_hdr *req = cmd;
     struct ism_resp_hdr *resp = cmd;
 
     __ism_write_cmd(ism, req + 1, sizeof(*req), req->len - sizeof(*req));
     __ism_write_cmd(ism, req, 0, sizeof(*req));
 
     WRITE_ONCE(resp->ret, ISM_ERROR);
 
     __ism_read_cmd(ism, resp, 0, sizeof(*resp));
     if (resp->ret) {
         debug_text_event(ism_debug_info, 0, "cmd failure");
         debug_event(ism_debug_info, 0, resp, sizeof(*resp));
         goto out;
     }
     __ism_read_cmd(ism, resp + 1, sizeof(*resp), resp->len - sizeof(*resp));
 out:
     return resp->ret;
 }
 
 static int ism_cmd_simple(struct ism_dev *ism, u32 cmd_code)
 {
     union ism_cmd_simple cmd;
 
     memset(&cmd, 0, sizeof(cmd));
     cmd.request.hdr.cmd = cmd_code;
     cmd.request.hdr.len = sizeof(cmd.request);
 
     return ism_cmd(ism, &cmd);
 }
 
 static int query_info(struct ism_dev *ism)
 {
     union ism_qi cmd;
 
     memset(&cmd, 0, sizeof(cmd));
     cmd.request.hdr.cmd = ISM_QUERY_INFO;
     cmd.request.hdr.len = sizeof(cmd.request);
 
     if (ism_cmd(ism, &cmd))
         goto out;
 
     debug_text_event(ism_debug_info, 3, "query info");
     debug_event(ism_debug_info, 3, &cmd.response, sizeof(cmd.response));
 out:
     return 0;
 }
 
 static int register_sba(struct ism_dev *ism)
 {
     union ism_reg_sba cmd;
     dma_addr_t dma_handle;
     struct ism_sba *sba;
 
     sba = dma_alloc_coherent(&ism->pdev->dev, PAGE_SIZE, &dma_handle,
                  GFP_KERNEL);
     if (!sba)
         return -ENOMEM;
 
     memset(&cmd, 0, sizeof(cmd));
     cmd.request.hdr.cmd = ISM_REG_SBA;
     cmd.request.hdr.len = sizeof(cmd.request);
     cmd.request.sba = dma_handle;
 
     if (ism_cmd(ism, &cmd)) {
         dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, sba, dma_handle);
         return -EIO;
     }
 
     ism->sba = sba;
     ism->sba_dma_addr = dma_handle;
 
     return 0;
 }
 
 static int register_ieq(struct ism_dev *ism)
 {
     union ism_reg_ieq cmd;
     dma_addr_t dma_handle;
     struct ism_eq *ieq;
 
     ieq = dma_alloc_coherent(&ism->pdev->dev, PAGE_SIZE, &dma_handle,
                  GFP_KERNEL);
     if (!ieq)
         return -ENOMEM;
 
     memset(&cmd, 0, sizeof(cmd));
     cmd.request.hdr.cmd = ISM_REG_IEQ;
     cmd.request.hdr.len = sizeof(cmd.request);
     cmd.request.ieq = dma_handle;
     cmd.request.len = sizeof(*ieq);
 
     if (ism_cmd(ism, &cmd)) {
         dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, ieq, dma_handle);
         return -EIO;
     }
 
     ism->ieq = ieq;
     ism->ieq_idx = -1;
     ism->ieq_dma_addr = dma_handle;
 
     return 0;
 }
 
 static int unregister_sba(struct ism_dev *ism)
 {
     int ret;
 
     if (!ism->sba)
         return 0;
 
     ret = ism_cmd_simple(ism, ISM_UNREG_SBA);
     if (ret && ret != ISM_ERROR)
         return -EIO;
 
     dma_free_coherent(&ism->pdev->dev, PAGE_SIZE,
               ism->sba, ism->sba_dma_addr);
 
     ism->sba = NULL;
     ism->sba_dma_addr = 0;
 
     return 0;
 }
 
 static int unregister_ieq(struct ism_dev *ism)
 {
     int ret;
 
     if (!ism->ieq)
         return 0;
 
     ret = ism_cmd_simple(ism, ISM_UNREG_IEQ);
     if (ret && ret != ISM_ERROR)
         return -EIO;
 
     dma_free_coherent(&ism->pdev->dev, PAGE_SIZE,
               ism->ieq, ism->ieq_dma_addr);
 
     ism->ieq = NULL;
     ism->ieq_dma_addr = 0;
 
     return 0;
 }
 
 static int ism_read_local_gid(struct ism_dev *ism)
 {
     union ism_read_gid cmd;
     int ret;
 
     memset(&cmd, 0, sizeof(cmd));
     cmd.request.hdr.cmd = ISM_READ_GID;
     cmd.request.hdr.len = sizeof(cmd.request);
 
     ret = ism_cmd(ism, &cmd);
     if (ret)
         goto out;
 
     ism->smcd->local_gid = cmd.response.gid;
 out:
     return ret;
 }
 
 static int ism_query_rgid(struct smcd_dev *smcd, u64 rgid, u32 vid_valid,
               u32 vid)
 {
     struct ism_dev *ism = smcd->priv;
     union ism_query_rgid cmd;
 
     memset(&cmd, 0, sizeof(cmd));
     cmd.request.hdr.cmd = ISM_QUERY_RGID;
     cmd.request.hdr.len = sizeof(cmd.request);
 
     cmd.request.rgid = rgid;
     cmd.request.vlan_valid = vid_valid;
     cmd.request.vlan_id = vid;
 
     return ism_cmd(ism, &cmd);
 }
 
 static void ism_free_dmb(struct ism_dev *ism, struct smcd_dmb *dmb)
 {
     clear_bit(dmb->sba_idx, ism->sba_bitmap);
     dma_free_coherent(&ism->pdev->dev, dmb->dmb_len,
               dmb->cpu_addr, dmb->dma_addr);
 }
 
 static int ism_alloc_dmb(struct ism_dev *ism, struct smcd_dmb *dmb)
 {
     unsigned long bit;
 
     if (PAGE_ALIGN(dmb->dmb_len) > dma_get_max_seg_size(&ism->pdev->dev))
         return -EINVAL;
 
     if (!dmb->sba_idx) {
         bit = find_next_zero_bit(ism->sba_bitmap, ISM_NR_DMBS,
                      ISM_DMB_BIT_OFFSET);
         if (bit == ISM_NR_DMBS)
             return -ENOSPC;
 
         dmb->sba_idx = bit;
     }
     if (dmb->sba_idx < ISM_DMB_BIT_OFFSET ||
         test_and_set_bit(dmb->sba_idx, ism->sba_bitmap))
         return -EINVAL;
 
     dmb->cpu_addr = dma_alloc_coherent(&ism->pdev->dev, dmb->dmb_len,
                        &dmb->dma_addr,
                        GFP_KERNEL | __GFP_NOWARN | __GFP_NOMEMALLOC | __GFP_COMP | __GFP_NORETRY);
     if (!dmb->cpu_addr)
         clear_bit(dmb->sba_idx, ism->sba_bitmap);
 
     return dmb->cpu_addr ? 0 : -ENOMEM;
 }
 
 static int ism_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb)
 {
     struct ism_dev *ism = smcd->priv;
     union ism_reg_dmb cmd;
     int ret;
 
     ret = ism_alloc_dmb(ism, dmb);
     if (ret)
         goto out;
 
     memset(&cmd, 0, sizeof(cmd));
     cmd.request.hdr.cmd = ISM_REG_DMB;
     cmd.request.hdr.len = sizeof(cmd.request);
 
     cmd.request.dmb = dmb->dma_addr;
     cmd.request.dmb_len = dmb->dmb_len;
     cmd.request.sba_idx = dmb->sba_idx;
     cmd.request.vlan_valid = dmb->vlan_valid;
     cmd.request.vlan_id = dmb->vlan_id;
     cmd.request.rgid = dmb->rgid;
 
     ret = ism_cmd(ism, &cmd);
     if (ret) {
         ism_free_dmb(ism, dmb);
         goto out;
     }
     dmb->dmb_tok = cmd.response.dmb_tok;
 out:
     return ret;
 }
 
 static int ism_unregister_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb)
 {
     struct ism_dev *ism = smcd->priv;
     union ism_unreg_dmb cmd;
     int ret;
 
     memset(&cmd, 0, sizeof(cmd));
     cmd.request.hdr.cmd = ISM_UNREG_DMB;
     cmd.request.hdr.len = sizeof(cmd.request);
 
     cmd.request.dmb_tok = dmb->dmb_tok;
 
     ret = ism_cmd(ism, &cmd);
     if (ret && ret != ISM_ERROR)
         goto out;
 
     ism_free_dmb(ism, dmb);
 out:
     return ret;
 }
 
 static int ism_add_vlan_id(struct smcd_dev *smcd, u64 vlan_id)
 {
     struct ism_dev *ism = smcd->priv;
     union ism_set_vlan_id cmd;
 
     memset(&cmd, 0, sizeof(cmd));
     cmd.request.hdr.cmd = ISM_ADD_VLAN_ID;
     cmd.request.hdr.len = sizeof(cmd.request);
 
     cmd.request.vlan_id = vlan_id;
 
     return ism_cmd(ism, &cmd);
 }
 
 static int ism_del_vlan_id(struct smcd_dev *smcd, u64 vlan_id)
 {
     struct ism_dev *ism = smcd->priv;
     union ism_set_vlan_id cmd;
 
     memset(&cmd, 0, sizeof(cmd));
     cmd.request.hdr.cmd = ISM_DEL_VLAN_ID;
     cmd.request.hdr.len = sizeof(cmd.request);
 
     cmd.request.vlan_id = vlan_id;
 
     return ism_cmd(ism, &cmd);
 }
 
 static int ism_set_vlan_required(struct smcd_dev *smcd)
 {
     return ism_cmd_simple(smcd->priv, ISM_SET_VLAN);
 }
 
 static int ism_reset_vlan_required(struct smcd_dev *smcd)
 {
     return ism_cmd_simple(smcd->priv, ISM_RESET_VLAN);
 }
 
 static int ism_signal_ieq(struct smcd_dev *smcd, u64 rgid, u32 trigger_irq,
               u32 event_code, u64 info)
 {
     struct ism_dev *ism = smcd->priv;
     union ism_sig_ieq cmd;
 
     memset(&cmd, 0, sizeof(cmd));
     cmd.request.hdr.cmd = ISM_SIGNAL_IEQ;
     cmd.request.hdr.len = sizeof(cmd.request);
 
     cmd.request.rgid = rgid;
     cmd.request.trigger_irq = trigger_irq;
     cmd.request.event_code = event_code;
     cmd.request.info = info;
 
     return ism_cmd(ism, &cmd);
 }
 
 static unsigned int max_bytes(unsigned int start, unsigned int len,
                   unsigned int boundary)
 {
     return min(boundary - (start & (boundary - 1)), len);
 }
 
 static int ism_move(struct smcd_dev *smcd, u64 dmb_tok, unsigned int idx,
             bool sf, unsigned int offset, void *data, unsigned int size)
 {
     struct ism_dev *ism = smcd->priv;
     unsigned int bytes;
     u64 dmb_req;
     int ret;
 
     while (size) {
         bytes = max_bytes(offset, size, PAGE_SIZE);
         dmb_req = ISM_CREATE_REQ(dmb_tok, idx, size == bytes ? sf : 0,
                      offset);
 
         ret = __ism_move(ism, dmb_req, data, bytes);
         if (ret)
             return ret;
 
         size -= bytes;
         data += bytes;
         offset += bytes;
     }
 
     return 0;
 }
 
 static struct ism_systemeid SYSTEM_EID = {
     .seid_string = "IBM-SYSZ-ISMSEID00000000",
     .serial_number = "0000",
     .type = "0000",
 };
 
 static void ism_create_system_eid(void)
 {
     struct cpuid id;
     u16 ident_tail;
     char tmp[5];
 
     get_cpu_id(&id);
     ident_tail = (u16)(id.ident & ISM_IDENT_MASK);
     snprintf(tmp, 5, "%04X", ident_tail);
     memcpy(&SYSTEM_EID.serial_number, tmp, 4);
     snprintf(tmp, 5, "%04X", id.machine);
     memcpy(&SYSTEM_EID.type, tmp, 4);
 }
 
 static u8 *ism_get_system_eid(void)
 {
     return SYSTEM_EID.seid_string;
 }
 
 static u16 ism_get_chid(struct smcd_dev *smcd)
 {
     struct ism_dev *ism = (struct ism_dev *)smcd->priv;
 
     if (!ism || !ism->pdev)
         return 0;
 
     return to_zpci(ism->pdev)->pchid;
 }
 
 static void ism_handle_event(struct ism_dev *ism)
 {
     struct smcd_event *entry;
 
     while ((ism->ieq_idx + 1) != READ_ONCE(ism->ieq->header.idx)) {
         if (++(ism->ieq_idx) == ARRAY_SIZE(ism->ieq->entry))
             ism->ieq_idx = 0;
 
         entry = &ism->ieq->entry[ism->ieq_idx];
         debug_event(ism_debug_info, 2, entry, sizeof(*entry));
         smcd_handle_event(ism->smcd, entry);
     }
 }
 
 static irqreturn_t ism_handle_irq(int irq, void *data)
 {
     struct ism_dev *ism = data;
     unsigned long bit, end;
     unsigned long *bv;
     u16 dmbemask;
 
     bv = (void *) &ism->sba->dmb_bits[ISM_DMB_WORD_OFFSET];
     end = sizeof(ism->sba->dmb_bits) * BITS_PER_BYTE - ISM_DMB_BIT_OFFSET;
 
     spin_lock(&ism->lock);
     ism->sba->s = 0;
     barrier();
     for (bit = 0;;) {
         bit = find_next_bit_inv(bv, end, bit);
         if (bit >= end)
             break;
 
         clear_bit_inv(bit, bv);
         dmbemask = ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET];
         ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET] = 0;
         barrier();
         smcd_handle_irq(ism->smcd, bit + ISM_DMB_BIT_OFFSET, dmbemask);
     }
 
     if (ism->sba->e) {
         ism->sba->e = 0;
         barrier();
         ism_handle_event(ism);
     }
     spin_unlock(&ism->lock);
     return IRQ_HANDLED;
 }
 
 static const struct smcd_ops ism_ops = {
     .query_remote_gid = ism_query_rgid,
     .register_dmb = ism_register_dmb,
     .unregister_dmb = ism_unregister_dmb,
     .add_vlan_id = ism_add_vlan_id,
     .del_vlan_id = ism_del_vlan_id,
     .set_vlan_required = ism_set_vlan_required,
     .reset_vlan_required = ism_reset_vlan_required,
     .signal_event = ism_signal_ieq,
     .move_data = ism_move,
     .get_system_eid = ism_get_system_eid,
     .get_chid = ism_get_chid,
 };
 
 static int ism_dev_init(struct ism_dev *ism)
 {
     struct pci_dev *pdev = ism->pdev;
     int ret;
 
     ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI);
     if (ret <= 0)
         goto out;
 
     ret = request_irq(pci_irq_vector(pdev, 0), ism_handle_irq, 0,
               pci_name(pdev), ism);
     if (ret)
         goto free_vectors;
 
     ret = register_sba(ism);
     if (ret)
         goto free_irq;
 
     ret = register_ieq(ism);
     if (ret)
         goto unreg_sba;
 
     ret = ism_read_local_gid(ism);
     if (ret)
         goto unreg_ieq;
 
     if (!ism_add_vlan_id(ism->smcd, ISM_RESERVED_VLANID))
         /* hardware is V2 capable */
         ism_create_system_eid();
 
     ret = smcd_register_dev(ism->smcd);
     if (ret)
         goto unreg_ieq;
 
     query_info(ism);
     return 0;
 
 unreg_ieq:
     unregister_ieq(ism);
 unreg_sba:
     unregister_sba(ism);
 free_irq:
     free_irq(pci_irq_vector(pdev, 0), ism);
 free_vectors:
     pci_free_irq_vectors(pdev);
 out:
     return ret;
 }
 
 static int ism_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
     struct ism_dev *ism;
     int ret;
 
     ism = kzalloc(sizeof(*ism), GFP_KERNEL);
     if (!ism)
         return -ENOMEM;
 
     spin_lock_init(&ism->lock);
     dev_set_drvdata(&pdev->dev, ism);
     ism->pdev = pdev;
 
     ret = pci_enable_device_mem(pdev);
     if (ret)
         goto err;
 
     ret = pci_request_mem_regions(pdev, DRV_NAME);
     if (ret)
         goto err_disable;
 
     ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
     if (ret)
         goto err_resource;
 
     dma_set_seg_boundary(&pdev->dev, SZ_1M - 1);
     dma_set_max_seg_size(&pdev->dev, SZ_1M);
     pci_set_master(pdev);
 
     ism->smcd = smcd_alloc_dev(&pdev->dev, dev_name(&pdev->dev), &ism_ops,
                    ISM_NR_DMBS);
     if (!ism->smcd) {
         ret = -ENOMEM;
         goto err_resource;
     }
 
     ism->smcd->priv = ism;
     ret = ism_dev_init(ism);
     if (ret)
         goto err_free;
 
     return 0;
 
 err_free:
     smcd_free_dev(ism->smcd);
 err_resource:
     pci_release_mem_regions(pdev);
 err_disable:
     pci_disable_device(pdev);
 err:
     kfree(ism);
     dev_set_drvdata(&pdev->dev, NULL);
     return ret;
 }
 
 static void ism_dev_exit(struct ism_dev *ism)
 {
     struct pci_dev *pdev = ism->pdev;
 
     smcd_unregister_dev(ism->smcd);
     if (SYSTEM_EID.serial_number[0] != '0' ||
         SYSTEM_EID.type[0] != '0')
         ism_del_vlan_id(ism->smcd, ISM_RESERVED_VLANID);
     unregister_ieq(ism);
     unregister_sba(ism);
     free_irq(pci_irq_vector(pdev, 0), ism);
     pci_free_irq_vectors(pdev);
 }
 
 static void ism_remove(struct pci_dev *pdev)
 {
     struct ism_dev *ism = dev_get_drvdata(&pdev->dev);
 
     ism_dev_exit(ism);
 
     smcd_free_dev(ism->smcd);
     pci_release_mem_regions(pdev);
     pci_disable_device(pdev);
     dev_set_drvdata(&pdev->dev, NULL);
     kfree(ism);
 }
 
 static struct pci_driver ism_driver = {
     .name     = DRV_NAME,
     .id_table = ism_device_table,
     .probe    = ism_probe,
     .remove   = ism_remove,
 };
 
 static int __init ism_init(void)
 {
     int ret;
 
     ism_debug_info = debug_register("ism", 2, 1, 16);
     if (!ism_debug_info)
         return -ENODEV;
 
     debug_register_view(ism_debug_info, &debug_hex_ascii_view);
     ret = pci_register_driver(&ism_driver);
     if (ret)
         debug_unregister(ism_debug_info);
 
     return ret;
 }
 
 static void __exit ism_exit(void)
 {
     pci_unregister_driver(&ism_driver);
     debug_unregister(ism_debug_info);
 }
 
 module_init(ism_init);
 module_exit(ism_exit);

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