621 lines
13 KiB
C
621 lines
13 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* ISM driver for s390.
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*
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* Copyright IBM Corp. 2018
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*/
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#define KMSG_COMPONENT "ism"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#include <linux/device.h>
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#include <linux/pci.h>
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#include <linux/err.h>
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#include <net/smc.h>
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#include <asm/debug.h>
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#include "ism.h"
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MODULE_DESCRIPTION("ISM driver for s390");
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MODULE_LICENSE("GPL");
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#define PCI_DEVICE_ID_IBM_ISM 0x04ED
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#define DRV_NAME "ism"
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static const struct pci_device_id ism_device_table[] = {
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{ PCI_VDEVICE(IBM, PCI_DEVICE_ID_IBM_ISM), 0 },
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{ 0, }
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};
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MODULE_DEVICE_TABLE(pci, ism_device_table);
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static debug_info_t *ism_debug_info;
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static int ism_cmd(struct ism_dev *ism, void *cmd)
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{
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struct ism_req_hdr *req = cmd;
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struct ism_resp_hdr *resp = cmd;
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__ism_write_cmd(ism, req + 1, sizeof(*req), req->len - sizeof(*req));
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__ism_write_cmd(ism, req, 0, sizeof(*req));
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WRITE_ONCE(resp->ret, ISM_ERROR);
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__ism_read_cmd(ism, resp, 0, sizeof(*resp));
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if (resp->ret) {
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debug_text_event(ism_debug_info, 0, "cmd failure");
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debug_event(ism_debug_info, 0, resp, sizeof(*resp));
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goto out;
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}
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__ism_read_cmd(ism, resp + 1, sizeof(*resp), resp->len - sizeof(*resp));
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out:
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return resp->ret;
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}
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static int ism_cmd_simple(struct ism_dev *ism, u32 cmd_code)
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{
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union ism_cmd_simple cmd;
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memset(&cmd, 0, sizeof(cmd));
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cmd.request.hdr.cmd = cmd_code;
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cmd.request.hdr.len = sizeof(cmd.request);
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return ism_cmd(ism, &cmd);
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}
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static int query_info(struct ism_dev *ism)
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{
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union ism_qi cmd;
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memset(&cmd, 0, sizeof(cmd));
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cmd.request.hdr.cmd = ISM_QUERY_INFO;
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cmd.request.hdr.len = sizeof(cmd.request);
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if (ism_cmd(ism, &cmd))
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goto out;
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debug_text_event(ism_debug_info, 3, "query info");
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debug_event(ism_debug_info, 3, &cmd.response, sizeof(cmd.response));
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out:
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return 0;
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}
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static int register_sba(struct ism_dev *ism)
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{
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union ism_reg_sba cmd;
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dma_addr_t dma_handle;
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struct ism_sba *sba;
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sba = dma_alloc_coherent(&ism->pdev->dev, PAGE_SIZE, &dma_handle,
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GFP_KERNEL);
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if (!sba)
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return -ENOMEM;
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memset(&cmd, 0, sizeof(cmd));
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cmd.request.hdr.cmd = ISM_REG_SBA;
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cmd.request.hdr.len = sizeof(cmd.request);
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cmd.request.sba = dma_handle;
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if (ism_cmd(ism, &cmd)) {
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dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, sba, dma_handle);
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return -EIO;
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}
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ism->sba = sba;
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ism->sba_dma_addr = dma_handle;
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return 0;
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}
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static int register_ieq(struct ism_dev *ism)
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{
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union ism_reg_ieq cmd;
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dma_addr_t dma_handle;
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struct ism_eq *ieq;
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ieq = dma_alloc_coherent(&ism->pdev->dev, PAGE_SIZE, &dma_handle,
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GFP_KERNEL);
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if (!ieq)
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return -ENOMEM;
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memset(&cmd, 0, sizeof(cmd));
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cmd.request.hdr.cmd = ISM_REG_IEQ;
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cmd.request.hdr.len = sizeof(cmd.request);
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cmd.request.ieq = dma_handle;
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cmd.request.len = sizeof(*ieq);
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if (ism_cmd(ism, &cmd)) {
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dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, ieq, dma_handle);
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return -EIO;
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}
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ism->ieq = ieq;
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ism->ieq_idx = -1;
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ism->ieq_dma_addr = dma_handle;
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return 0;
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}
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static int unregister_sba(struct ism_dev *ism)
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{
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int ret;
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if (!ism->sba)
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return 0;
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ret = ism_cmd_simple(ism, ISM_UNREG_SBA);
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if (ret && ret != ISM_ERROR)
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return -EIO;
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dma_free_coherent(&ism->pdev->dev, PAGE_SIZE,
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ism->sba, ism->sba_dma_addr);
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ism->sba = NULL;
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ism->sba_dma_addr = 0;
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return 0;
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}
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static int unregister_ieq(struct ism_dev *ism)
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{
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int ret;
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if (!ism->ieq)
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return 0;
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ret = ism_cmd_simple(ism, ISM_UNREG_IEQ);
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if (ret && ret != ISM_ERROR)
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return -EIO;
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dma_free_coherent(&ism->pdev->dev, PAGE_SIZE,
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ism->ieq, ism->ieq_dma_addr);
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ism->ieq = NULL;
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ism->ieq_dma_addr = 0;
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return 0;
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}
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static int ism_read_local_gid(struct ism_dev *ism)
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{
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union ism_read_gid cmd;
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int ret;
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memset(&cmd, 0, sizeof(cmd));
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cmd.request.hdr.cmd = ISM_READ_GID;
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cmd.request.hdr.len = sizeof(cmd.request);
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ret = ism_cmd(ism, &cmd);
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if (ret)
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goto out;
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ism->smcd->local_gid = cmd.response.gid;
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out:
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return ret;
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}
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static int ism_query_rgid(struct smcd_dev *smcd, u64 rgid, u32 vid_valid,
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u32 vid)
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{
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struct ism_dev *ism = smcd->priv;
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union ism_query_rgid cmd;
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memset(&cmd, 0, sizeof(cmd));
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cmd.request.hdr.cmd = ISM_QUERY_RGID;
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cmd.request.hdr.len = sizeof(cmd.request);
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cmd.request.rgid = rgid;
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cmd.request.vlan_valid = vid_valid;
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cmd.request.vlan_id = vid;
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return ism_cmd(ism, &cmd);
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}
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static void ism_free_dmb(struct ism_dev *ism, struct smcd_dmb *dmb)
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{
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clear_bit(dmb->sba_idx, ism->sba_bitmap);
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dma_free_coherent(&ism->pdev->dev, dmb->dmb_len,
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dmb->cpu_addr, dmb->dma_addr);
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}
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static int ism_alloc_dmb(struct ism_dev *ism, struct smcd_dmb *dmb)
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{
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unsigned long bit;
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if (PAGE_ALIGN(dmb->dmb_len) > dma_get_max_seg_size(&ism->pdev->dev))
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return -EINVAL;
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if (!dmb->sba_idx) {
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bit = find_next_zero_bit(ism->sba_bitmap, ISM_NR_DMBS,
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ISM_DMB_BIT_OFFSET);
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if (bit == ISM_NR_DMBS)
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return -ENOMEM;
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dmb->sba_idx = bit;
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}
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if (dmb->sba_idx < ISM_DMB_BIT_OFFSET ||
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test_and_set_bit(dmb->sba_idx, ism->sba_bitmap))
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return -EINVAL;
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dmb->cpu_addr = dma_alloc_coherent(&ism->pdev->dev, dmb->dmb_len,
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&dmb->dma_addr,
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GFP_KERNEL | __GFP_NOWARN | __GFP_NOMEMALLOC | __GFP_COMP | __GFP_NORETRY);
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if (!dmb->cpu_addr)
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clear_bit(dmb->sba_idx, ism->sba_bitmap);
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return dmb->cpu_addr ? 0 : -ENOMEM;
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}
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static int ism_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb)
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{
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struct ism_dev *ism = smcd->priv;
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union ism_reg_dmb cmd;
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int ret;
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ret = ism_alloc_dmb(ism, dmb);
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if (ret)
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goto out;
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memset(&cmd, 0, sizeof(cmd));
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cmd.request.hdr.cmd = ISM_REG_DMB;
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cmd.request.hdr.len = sizeof(cmd.request);
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cmd.request.dmb = dmb->dma_addr;
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cmd.request.dmb_len = dmb->dmb_len;
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cmd.request.sba_idx = dmb->sba_idx;
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cmd.request.vlan_valid = dmb->vlan_valid;
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cmd.request.vlan_id = dmb->vlan_id;
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cmd.request.rgid = dmb->rgid;
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ret = ism_cmd(ism, &cmd);
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if (ret) {
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ism_free_dmb(ism, dmb);
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goto out;
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}
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dmb->dmb_tok = cmd.response.dmb_tok;
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out:
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return ret;
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}
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static int ism_unregister_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb)
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{
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struct ism_dev *ism = smcd->priv;
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union ism_unreg_dmb cmd;
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int ret;
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memset(&cmd, 0, sizeof(cmd));
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cmd.request.hdr.cmd = ISM_UNREG_DMB;
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cmd.request.hdr.len = sizeof(cmd.request);
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cmd.request.dmb_tok = dmb->dmb_tok;
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ret = ism_cmd(ism, &cmd);
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if (ret && ret != ISM_ERROR)
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goto out;
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ism_free_dmb(ism, dmb);
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out:
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return ret;
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}
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static int ism_add_vlan_id(struct smcd_dev *smcd, u64 vlan_id)
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{
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struct ism_dev *ism = smcd->priv;
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union ism_set_vlan_id cmd;
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memset(&cmd, 0, sizeof(cmd));
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cmd.request.hdr.cmd = ISM_ADD_VLAN_ID;
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cmd.request.hdr.len = sizeof(cmd.request);
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cmd.request.vlan_id = vlan_id;
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return ism_cmd(ism, &cmd);
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}
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static int ism_del_vlan_id(struct smcd_dev *smcd, u64 vlan_id)
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{
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struct ism_dev *ism = smcd->priv;
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union ism_set_vlan_id cmd;
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memset(&cmd, 0, sizeof(cmd));
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cmd.request.hdr.cmd = ISM_DEL_VLAN_ID;
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cmd.request.hdr.len = sizeof(cmd.request);
|
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cmd.request.vlan_id = vlan_id;
|
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|
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return ism_cmd(ism, &cmd);
|
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|
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}
|
||
|
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|
||
|
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static int ism_set_vlan_required(struct smcd_dev *smcd)
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|
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{
|
||
|
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return ism_cmd_simple(smcd->priv, ISM_SET_VLAN);
|
||
|
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}
|
||
|
|
|
||
|
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static int ism_reset_vlan_required(struct smcd_dev *smcd)
|
||
|
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{
|
||
|
|
return ism_cmd_simple(smcd->priv, ISM_RESET_VLAN);
|
||
|
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}
|
||
|
|
|
||
|
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static int ism_signal_ieq(struct smcd_dev *smcd, u64 rgid, u32 trigger_irq,
|
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|
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u32 event_code, u64 info)
|
||
|
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{
|
||
|
|
struct ism_dev *ism = smcd->priv;
|
||
|
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union ism_sig_ieq cmd;
|
||
|
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|
||
|
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memset(&cmd, 0, sizeof(cmd));
|
||
|
|
cmd.request.hdr.cmd = ISM_SIGNAL_IEQ;
|
||
|
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cmd.request.hdr.len = sizeof(cmd.request);
|
||
|
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|
||
|
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cmd.request.rgid = rgid;
|
||
|
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cmd.request.trigger_irq = trigger_irq;
|
||
|
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cmd.request.event_code = event_code;
|
||
|
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cmd.request.info = info;
|
||
|
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|
||
|
|
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 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;
|
||
|
|
|
||
|
|
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);
|
||
|
|
ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET] = 0;
|
||
|
|
barrier();
|
||
|
|
smcd_handle_irq(ism->smcd, bit + ISM_DMB_BIT_OFFSET);
|
||
|
|
}
|
||
|
|
|
||
|
|
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,
|
||
|
|
};
|
||
|
|
|
||
|
|
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;
|
||
|
|
|
||
|
|
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 = pci_set_dma_mask(pdev, 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)
|
||
|
|
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);
|
||
|
|
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 int ism_suspend(struct device *dev)
|
||
|
|
{
|
||
|
|
struct ism_dev *ism = dev_get_drvdata(dev);
|
||
|
|
|
||
|
|
ism_dev_exit(ism);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ism_resume(struct device *dev)
|
||
|
|
{
|
||
|
|
struct ism_dev *ism = dev_get_drvdata(dev);
|
||
|
|
|
||
|
|
return ism_dev_init(ism);
|
||
|
|
}
|
||
|
|
|
||
|
|
static SIMPLE_DEV_PM_OPS(ism_pm_ops, ism_suspend, ism_resume);
|
||
|
|
|
||
|
|
static struct pci_driver ism_driver = {
|
||
|
|
.name = DRV_NAME,
|
||
|
|
.id_table = ism_device_table,
|
||
|
|
.probe = ism_probe,
|
||
|
|
.remove = ism_remove,
|
||
|
|
.driver = {
|
||
|
|
.pm = &ism_pm_ops,
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
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);
|