s390/pci: CLP interface
CLP instructions are used to query the firmware about detected PCI functions, the attributes of those functions and to enable or disable a PCI function. The CLP interface is the equivalent to a PCI bus scan. Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Jan Glauber
committed by
Martin Schwidefsky
Martin Schwidefsky
parent
cd24834130
commit
a755a45dd9
@@ -2,4 +2,4 @@
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# Makefile for the s390 PCI subsystem.
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#
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obj-$(CONFIG_PCI) += pci.o
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obj-$(CONFIG_PCI) += pci.o pci_clp.o
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@@ -29,6 +29,7 @@
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#include <asm/facility.h>
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#include <asm/pci_insn.h>
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#include <asm/pci_clp.h>
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#define DEBUG /* enable pr_debug */
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@@ -436,6 +437,20 @@ static void zpci_free_domain(struct zpci_dev *zdev)
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spin_unlock(&zpci_domain_lock);
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}
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int zpci_enable_device(struct zpci_dev *zdev)
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{
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int rc;
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rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
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if (rc)
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goto out;
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pr_info("Enabled fh: 0x%x fid: 0x%x\n", zdev->fh, zdev->fid);
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return 0;
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out:
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return rc;
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}
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EXPORT_SYMBOL_GPL(zpci_enable_device);
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int zpci_create_device(struct zpci_dev *zdev)
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{
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int rc;
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@@ -455,8 +470,15 @@ int zpci_create_device(struct zpci_dev *zdev)
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if (zdev->state == ZPCI_FN_STATE_STANDBY)
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return 0;
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rc = zpci_enable_device(zdev);
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if (rc)
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goto out_start;
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return 0;
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out_start:
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mutex_lock(&zpci_list_lock);
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list_del(&zdev->entry);
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mutex_unlock(&zpci_list_lock);
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out_bus:
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zpci_free_domain(zdev);
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out:
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@@ -489,6 +511,7 @@ int zpci_scan_device(struct zpci_dev *zdev)
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return 0;
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out:
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clp_disable_fh(zdev);
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return -EIO;
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}
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EXPORT_SYMBOL_GPL(zpci_scan_device);
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@@ -547,9 +570,14 @@ static int __init pci_base_init(void)
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if (rc)
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goto out_mem;
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rc = clp_find_pci_devices();
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if (rc)
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goto out_find;
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zpci_scan_devices();
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return 0;
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out_find:
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zpci_mem_exit();
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out_mem:
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return rc;
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317
arch/s390/pci/pci_clp.c
Normal file
317
arch/s390/pci/pci_clp.c
Normal file
@@ -0,0 +1,317 @@
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/*
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* Copyright IBM Corp. 2012
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*
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* Author(s):
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* Jan Glauber <jang@linux.vnet.ibm.com>
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*/
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#define COMPONENT "zPCI"
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#define pr_fmt(fmt) COMPONENT ": " fmt
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/delay.h>
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#include <linux/pci.h>
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#include <asm/pci_clp.h>
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/*
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* Call Logical Processor
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* Retry logic is handled by the caller.
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*/
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static inline u8 clp_instr(void *req)
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{
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u64 ilpm;
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u8 cc;
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asm volatile (
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" .insn rrf,0xb9a00000,%[ilpm],%[req],0x0,0x2\n"
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" ipm %[cc]\n"
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" srl %[cc],28\n"
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: [cc] "=d" (cc), [ilpm] "=d" (ilpm)
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: [req] "a" (req)
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: "cc", "memory");
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return cc;
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}
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static void *clp_alloc_block(void)
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{
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struct page *page = alloc_pages(GFP_KERNEL, get_order(CLP_BLK_SIZE));
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return (page) ? page_address(page) : NULL;
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}
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static void clp_free_block(void *ptr)
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{
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free_pages((unsigned long) ptr, get_order(CLP_BLK_SIZE));
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}
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static void clp_store_query_pci_fngrp(struct zpci_dev *zdev,
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struct clp_rsp_query_pci_grp *response)
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{
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switch (response->version) {
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case 1:
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zdev->max_bus_speed = PCIE_SPEED_5_0GT;
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break;
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default:
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zdev->max_bus_speed = PCI_SPEED_UNKNOWN;
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break;
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}
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}
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static int clp_query_pci_fngrp(struct zpci_dev *zdev, u8 pfgid)
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{
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struct clp_req_rsp_query_pci_grp *rrb;
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int rc;
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rrb = clp_alloc_block();
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if (!rrb)
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return -ENOMEM;
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memset(rrb, 0, sizeof(*rrb));
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rrb->request.hdr.len = sizeof(rrb->request);
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rrb->request.hdr.cmd = CLP_QUERY_PCI_FNGRP;
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rrb->response.hdr.len = sizeof(rrb->response);
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rrb->request.pfgid = pfgid;
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rc = clp_instr(rrb);
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if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
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clp_store_query_pci_fngrp(zdev, &rrb->response);
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else {
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pr_err("Query PCI FNGRP failed with response: %x cc: %d\n",
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rrb->response.hdr.rsp, rc);
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rc = -EIO;
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}
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clp_free_block(rrb);
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return rc;
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}
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static int clp_store_query_pci_fn(struct zpci_dev *zdev,
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struct clp_rsp_query_pci *response)
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{
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int i;
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for (i = 0; i < PCI_BAR_COUNT; i++) {
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zdev->bars[i].val = le32_to_cpu(response->bar[i]);
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zdev->bars[i].size = response->bar_size[i];
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}
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zdev->pchid = response->pchid;
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zdev->pfgid = response->pfgid;
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return 0;
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}
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static int clp_query_pci_fn(struct zpci_dev *zdev, u32 fh)
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{
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struct clp_req_rsp_query_pci *rrb;
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int rc;
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rrb = clp_alloc_block();
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if (!rrb)
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return -ENOMEM;
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memset(rrb, 0, sizeof(*rrb));
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rrb->request.hdr.len = sizeof(rrb->request);
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rrb->request.hdr.cmd = CLP_QUERY_PCI_FN;
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rrb->response.hdr.len = sizeof(rrb->response);
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rrb->request.fh = fh;
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rc = clp_instr(rrb);
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if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
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rc = clp_store_query_pci_fn(zdev, &rrb->response);
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if (rc)
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goto out;
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if (rrb->response.pfgid)
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rc = clp_query_pci_fngrp(zdev, rrb->response.pfgid);
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} else {
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pr_err("Query PCI failed with response: %x cc: %d\n",
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rrb->response.hdr.rsp, rc);
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rc = -EIO;
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}
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out:
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clp_free_block(rrb);
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return rc;
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}
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int clp_add_pci_device(u32 fid, u32 fh, int configured)
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{
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struct zpci_dev *zdev;
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int rc;
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zdev = zpci_alloc_device();
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if (IS_ERR(zdev))
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return PTR_ERR(zdev);
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zdev->fh = fh;
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zdev->fid = fid;
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/* Query function properties and update zdev */
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rc = clp_query_pci_fn(zdev, fh);
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if (rc)
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goto error;
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if (configured)
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zdev->state = ZPCI_FN_STATE_CONFIGURED;
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else
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zdev->state = ZPCI_FN_STATE_STANDBY;
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rc = zpci_create_device(zdev);
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if (rc)
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goto error;
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return 0;
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error:
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zpci_free_device(zdev);
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return rc;
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}
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/*
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* Enable/Disable a given PCI function defined by its function handle.
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*/
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static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command)
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{
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struct clp_req_rsp_set_pci *rrb;
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int rc, retries = 1000;
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rrb = clp_alloc_block();
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if (!rrb)
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return -ENOMEM;
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do {
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memset(rrb, 0, sizeof(*rrb));
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rrb->request.hdr.len = sizeof(rrb->request);
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rrb->request.hdr.cmd = CLP_SET_PCI_FN;
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rrb->response.hdr.len = sizeof(rrb->response);
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rrb->request.fh = *fh;
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rrb->request.oc = command;
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rrb->request.ndas = nr_dma_as;
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rc = clp_instr(rrb);
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if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) {
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retries--;
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if (retries < 0)
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break;
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msleep(1);
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}
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} while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);
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if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
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*fh = rrb->response.fh;
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else {
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pr_err("Set PCI FN failed with response: %x cc: %d\n",
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rrb->response.hdr.rsp, rc);
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rc = -EIO;
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}
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clp_free_block(rrb);
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return rc;
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}
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int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
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{
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u32 fh = zdev->fh;
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int rc;
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rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
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if (!rc)
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/* Success -> store enabled handle in zdev */
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zdev->fh = fh;
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return rc;
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}
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int clp_disable_fh(struct zpci_dev *zdev)
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{
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u32 fh = zdev->fh;
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int rc;
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if (!zdev_enabled(zdev))
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return 0;
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dev_info(&zdev->pdev->dev, "disabling fn handle: 0x%x\n", fh);
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rc = clp_set_pci_fn(&fh, 0, CLP_SET_DISABLE_PCI_FN);
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if (!rc)
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/* Success -> store disabled handle in zdev */
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zdev->fh = fh;
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else
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dev_err(&zdev->pdev->dev,
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"Failed to disable fn handle: 0x%x\n", fh);
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return rc;
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}
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static void clp_check_pcifn_entry(struct clp_fh_list_entry *entry)
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{
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int present, rc;
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if (!entry->vendor_id)
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return;
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/* TODO: be a little bit more scalable */
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present = zpci_fid_present(entry->fid);
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if (present)
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pr_debug("%s: device %x already present\n", __func__, entry->fid);
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/* skip already used functions */
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if (present && entry->config_state)
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return;
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/* aev 306: function moved to stand-by state */
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if (present && !entry->config_state) {
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/*
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* The handle is already disabled, that means no iota/irq freeing via
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* the firmware interfaces anymore. Need to free resources manually
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* (DMA memory, debug, sysfs)...
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*/
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zpci_stop_device(get_zdev_by_fid(entry->fid));
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return;
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}
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rc = clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
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if (rc)
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pr_err("Failed to add fid: 0x%x\n", entry->fid);
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}
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int clp_find_pci_devices(void)
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{
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struct clp_req_rsp_list_pci *rrb;
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u64 resume_token = 0;
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int entries, i, rc;
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rrb = clp_alloc_block();
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if (!rrb)
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return -ENOMEM;
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do {
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memset(rrb, 0, sizeof(*rrb));
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rrb->request.hdr.len = sizeof(rrb->request);
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rrb->request.hdr.cmd = CLP_LIST_PCI;
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/* store as many entries as possible */
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rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
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rrb->request.resume_token = resume_token;
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/* Get PCI function handle list */
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rc = clp_instr(rrb);
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if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
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pr_err("List PCI failed with response: 0x%x cc: %d\n",
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rrb->response.hdr.rsp, rc);
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rc = -EIO;
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goto out;
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}
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WARN_ON_ONCE(rrb->response.entry_size !=
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sizeof(struct clp_fh_list_entry));
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entries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
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rrb->response.entry_size;
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pr_info("Detected number of PCI functions: %u\n", entries);
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/* Store the returned resume token as input for the next call */
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resume_token = rrb->response.resume_token;
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for (i = 0; i < entries; i++)
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clp_check_pcifn_entry(&rrb->response.fh_list[i]);
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} while (resume_token);
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pr_debug("Maximum number of supported PCI functions: %u\n",
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rrb->response.max_fn);
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out:
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clp_free_block(rrb);
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return rc;
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}
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Block a user