2012-11-29 04:55:21 -07:00
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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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2014-07-16 09:21:01 -06:00
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#define KMSG_COMPONENT "zpci"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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2012-11-29 04:55:21 -07:00
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2016-01-13 04:54:28 -07:00
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#include <linux/compat.h>
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2012-11-29 04:55:21 -07:00
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#include <linux/kernel.h>
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2016-01-13 04:54:28 -07:00
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#include <linux/miscdevice.h>
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2012-11-29 04:55:21 -07:00
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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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2016-01-13 04:54:28 -07:00
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#include <linux/uaccess.h>
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2013-04-16 06:11:14 -06:00
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#include <asm/pci_debug.h>
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2012-11-29 04:55:21 -07:00
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#include <asm/pci_clp.h>
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2016-01-13 04:54:28 -07:00
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#include <asm/compat.h>
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#include <asm/clp.h>
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#include <uapi/asm/clp.h>
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2012-11-29 04:55:21 -07:00
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2013-10-22 07:17:19 -06:00
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static inline void zpci_err_clp(unsigned int rsp, int rc)
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{
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struct {
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unsigned int rsp;
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int rc;
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} __packed data = {rsp, rc};
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zpci_err_hex(&data, sizeof(data));
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}
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2012-11-29 04:55:21 -07:00
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/*
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2016-01-13 04:54:28 -07:00
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* Call Logical Processor with c=1, lps=0 and command 1
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* to get the bit mask of installed logical processors
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2012-11-29 04:55:21 -07:00
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*/
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2016-01-13 04:54:28 -07:00
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static inline int clp_get_ilp(unsigned long *ilp)
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{
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unsigned long mask;
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int cc = 3;
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asm volatile (
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" .insn rrf,0xb9a00000,%[mask],%[cmd],8,0\n"
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"0: ipm %[cc]\n"
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" srl %[cc],28\n"
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"1:\n"
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EX_TABLE(0b, 1b)
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: [cc] "+d" (cc), [mask] "=d" (mask) : [cmd] "a" (1)
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: "cc");
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*ilp = mask;
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return cc;
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}
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/*
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* Call Logical Processor with c=0, the give constant lps and an lpcb request.
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*/
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static inline int clp_req(void *data, unsigned int lps)
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2012-11-29 04:55:21 -07:00
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{
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2013-01-31 11:53:12 -07:00
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struct { u8 _[CLP_BLK_SIZE]; } *req = data;
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u64 ignored;
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2016-01-13 04:54:28 -07:00
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int cc = 3;
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2012-11-29 04:55:21 -07:00
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asm volatile (
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2016-01-13 04:54:28 -07:00
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" .insn rrf,0xb9a00000,%[ign],%[req],0,%[lps]\n"
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"0: ipm %[cc]\n"
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2012-11-29 04:55:21 -07:00
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" srl %[cc],28\n"
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2016-01-13 04:54:28 -07:00
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"1:\n"
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EX_TABLE(0b, 1b)
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: [cc] "+d" (cc), [ign] "=d" (ignored), "+m" (*req)
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: [req] "a" (req), [lps] "i" (lps)
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2013-01-31 11:53:12 -07:00
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: "cc");
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2012-11-29 04:55:21 -07:00
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return cc;
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}
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2013-08-29 11:37:28 -06:00
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static void *clp_alloc_block(gfp_t gfp_mask)
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2012-11-29 04:55:21 -07:00
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{
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2013-08-29 11:37:28 -06:00
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return (void *) __get_free_pages(gfp_mask, get_order(CLP_BLK_SIZE));
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2012-11-29 04:55:21 -07:00
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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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2012-11-29 06:33:30 -07:00
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zdev->tlb_refresh = response->refresh;
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zdev->dma_mask = response->dasm;
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2012-11-29 05:05:05 -07:00
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zdev->msi_addr = response->msia;
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2014-10-29 12:12:04 -06:00
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zdev->max_msi = response->noi;
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2012-12-11 06:53:35 -07:00
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zdev->fmb_update = response->mui;
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2012-11-29 05:05:05 -07:00
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2012-11-29 04:55:21 -07:00
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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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2013-08-29 11:37:28 -06:00
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rrb = clp_alloc_block(GFP_KERNEL);
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2012-11-29 04:55:21 -07:00
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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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2016-01-13 04:54:28 -07:00
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rc = clp_req(rrb, CLP_LPS_PCI);
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2012-11-29 04:55:21 -07:00
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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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2013-10-22 07:17:19 -06:00
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zpci_err("Q PCI FGRP:\n");
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zpci_err_clp(rrb->response.hdr.rsp, rc);
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2012-11-29 04:55:21 -07:00
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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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2012-11-29 06:33:30 -07:00
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zdev->start_dma = response->sdma;
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zdev->end_dma = response->edma;
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2012-11-29 04:55:21 -07:00
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zdev->pchid = response->pchid;
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zdev->pfgid = response->pfgid;
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2014-04-16 08:12:05 -06:00
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zdev->pft = response->pft;
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zdev->vfn = response->vfn;
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zdev->uid = response->uid;
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memcpy(zdev->pfip, response->pfip, sizeof(zdev->pfip));
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if (response->util_str_avail) {
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memcpy(zdev->util_str, response->util_str,
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sizeof(zdev->util_str));
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}
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2012-11-29 04:55:21 -07:00
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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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2013-08-29 11:37:28 -06:00
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rrb = clp_alloc_block(GFP_KERNEL);
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2012-11-29 04:55:21 -07:00
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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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2016-01-13 04:54:28 -07:00
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rc = clp_req(rrb, CLP_LPS_PCI);
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2012-11-29 04:55:21 -07:00
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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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2016-03-16 06:56:35 -06:00
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rc = clp_query_pci_fngrp(zdev, rrb->response.pfgid);
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2012-11-29 04:55:21 -07:00
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} else {
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2013-10-22 07:17:19 -06:00
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zpci_err("Q PCI FN:\n");
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zpci_err_clp(rrb->response.hdr.rsp, rc);
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2012-11-29 04:55:21 -07:00
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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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2013-04-16 06:11:14 -06:00
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zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, configured);
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2013-11-12 11:35:01 -07:00
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zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
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if (!zdev)
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return -ENOMEM;
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2012-11-29 04:55:21 -07:00
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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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2013-11-12 11:35:01 -07:00
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kfree(zdev);
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2012-11-29 04:55:21 -07:00
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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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2013-08-29 11:38:33 -06:00
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int rc, retries = 100;
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2012-11-29 04:55:21 -07:00
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2013-08-29 11:37:28 -06:00
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rrb = clp_alloc_block(GFP_KERNEL);
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2012-11-29 04:55:21 -07:00
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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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2016-01-13 04:54:28 -07:00
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rc = clp_req(rrb, CLP_LPS_PCI);
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2012-11-29 04:55:21 -07:00
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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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2013-08-29 11:38:33 -06:00
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msleep(20);
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2012-11-29 04:55:21 -07:00
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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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2013-10-22 07:17:19 -06:00
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zpci_err("Set PCI FN:\n");
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zpci_err_clp(rrb->response.hdr.rsp, rc);
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2012-11-29 04:55:21 -07:00
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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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2013-04-16 06:11:14 -06:00
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zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
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2012-11-29 04:55:21 -07:00
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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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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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2013-04-16 06:11:14 -06:00
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zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
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2012-11-29 04:55:21 -07:00
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return rc;
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}
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2013-08-29 11:37:28 -06:00
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static int clp_list_pci(struct clp_req_rsp_list_pci *rrb,
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void (*cb)(struct clp_fh_list_entry *entry))
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2012-11-29 04:55:21 -07:00
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{
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u64 resume_token = 0;
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int entries, i, rc;
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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 */
|
2016-01-13 04:54:28 -07:00
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rc = clp_req(rrb, CLP_LPS_PCI);
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2012-11-29 04:55:21 -07:00
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|
|
if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
|
2013-10-22 07:17:19 -06:00
|
|
|
zpci_err("List PCI FN:\n");
|
|
|
|
zpci_err_clp(rrb->response.hdr.rsp, rc);
|
2012-11-29 04:55:21 -07:00
|
|
|
rc = -EIO;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
WARN_ON_ONCE(rrb->response.entry_size !=
|
|
|
|
sizeof(struct clp_fh_list_entry));
|
|
|
|
|
|
|
|
entries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
|
|
|
|
rrb->response.entry_size;
|
|
|
|
|
|
|
|
resume_token = rrb->response.resume_token;
|
|
|
|
for (i = 0; i < entries; i++)
|
2013-08-29 11:37:28 -06:00
|
|
|
cb(&rrb->response.fh_list[i]);
|
2012-11-29 04:55:21 -07:00
|
|
|
} while (resume_token);
|
|
|
|
out:
|
2013-08-29 11:37:28 -06:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __clp_add(struct clp_fh_list_entry *entry)
|
|
|
|
{
|
|
|
|
if (!entry->vendor_id)
|
|
|
|
return;
|
|
|
|
|
|
|
|
clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __clp_rescan(struct clp_fh_list_entry *entry)
|
|
|
|
{
|
|
|
|
struct zpci_dev *zdev;
|
|
|
|
|
|
|
|
if (!entry->vendor_id)
|
|
|
|
return;
|
|
|
|
|
|
|
|
zdev = get_zdev_by_fid(entry->fid);
|
|
|
|
if (!zdev) {
|
|
|
|
clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!entry->config_state) {
|
|
|
|
/*
|
|
|
|
* The handle is already disabled, that means no iota/irq freeing via
|
|
|
|
* the firmware interfaces anymore. Need to free resources manually
|
|
|
|
* (DMA memory, debug, sysfs)...
|
|
|
|
*/
|
|
|
|
zpci_stop_device(zdev);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2013-08-29 11:40:01 -06:00
|
|
|
static void __clp_update(struct clp_fh_list_entry *entry)
|
|
|
|
{
|
|
|
|
struct zpci_dev *zdev;
|
|
|
|
|
|
|
|
if (!entry->vendor_id)
|
|
|
|
return;
|
|
|
|
|
|
|
|
zdev = get_zdev_by_fid(entry->fid);
|
|
|
|
if (!zdev)
|
|
|
|
return;
|
|
|
|
|
|
|
|
zdev->fh = entry->fh;
|
|
|
|
}
|
|
|
|
|
2013-08-29 11:37:28 -06:00
|
|
|
int clp_scan_pci_devices(void)
|
|
|
|
{
|
|
|
|
struct clp_req_rsp_list_pci *rrb;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
rrb = clp_alloc_block(GFP_KERNEL);
|
|
|
|
if (!rrb)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
rc = clp_list_pci(rrb, __clp_add);
|
|
|
|
|
|
|
|
clp_free_block(rrb);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
int clp_rescan_pci_devices(void)
|
|
|
|
{
|
|
|
|
struct clp_req_rsp_list_pci *rrb;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
rrb = clp_alloc_block(GFP_KERNEL);
|
|
|
|
if (!rrb)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
rc = clp_list_pci(rrb, __clp_rescan);
|
|
|
|
|
2012-11-29 04:55:21 -07:00
|
|
|
clp_free_block(rrb);
|
|
|
|
return rc;
|
|
|
|
}
|
2013-08-29 11:40:01 -06:00
|
|
|
|
|
|
|
int clp_rescan_pci_devices_simple(void)
|
|
|
|
{
|
|
|
|
struct clp_req_rsp_list_pci *rrb;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
rrb = clp_alloc_block(GFP_NOWAIT);
|
|
|
|
if (!rrb)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
rc = clp_list_pci(rrb, __clp_update);
|
|
|
|
|
|
|
|
clp_free_block(rrb);
|
|
|
|
return rc;
|
|
|
|
}
|
2016-01-13 04:54:28 -07:00
|
|
|
|
|
|
|
static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
|
|
|
|
{
|
|
|
|
unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
|
|
|
|
|
|
|
|
if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
|
|
|
|
lpcb->response.hdr.len > limit)
|
|
|
|
return -EINVAL;
|
|
|
|
return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
|
|
|
|
{
|
|
|
|
switch (lpcb->cmd) {
|
|
|
|
case 0x0001: /* store logical-processor characteristics */
|
|
|
|
return clp_base_slpc(req, (void *) lpcb);
|
|
|
|
default:
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
|
|
|
|
{
|
|
|
|
unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
|
|
|
|
|
|
|
|
if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
|
|
|
|
lpcb->response.hdr.len > limit)
|
|
|
|
return -EINVAL;
|
|
|
|
return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb)
|
|
|
|
{
|
|
|
|
unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
|
|
|
|
|
|
|
|
if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
|
|
|
|
lpcb->response.hdr.len > limit)
|
|
|
|
return -EINVAL;
|
|
|
|
if (lpcb->request.reserved2 != 0)
|
|
|
|
return -EINVAL;
|
|
|
|
return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int clp_pci_query(struct clp_req *req,
|
|
|
|
struct clp_req_rsp_query_pci *lpcb)
|
|
|
|
{
|
|
|
|
unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
|
|
|
|
|
|
|
|
if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
|
|
|
|
lpcb->response.hdr.len > limit)
|
|
|
|
return -EINVAL;
|
|
|
|
if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0)
|
|
|
|
return -EINVAL;
|
|
|
|
return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int clp_pci_query_grp(struct clp_req *req,
|
|
|
|
struct clp_req_rsp_query_pci_grp *lpcb)
|
|
|
|
{
|
|
|
|
unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
|
|
|
|
|
|
|
|
if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
|
|
|
|
lpcb->response.hdr.len > limit)
|
|
|
|
return -EINVAL;
|
|
|
|
if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0 ||
|
|
|
|
lpcb->request.reserved4 != 0)
|
|
|
|
return -EINVAL;
|
|
|
|
return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
|
|
|
|
{
|
|
|
|
switch (lpcb->cmd) {
|
|
|
|
case 0x0001: /* store logical-processor characteristics */
|
|
|
|
return clp_pci_slpc(req, (void *) lpcb);
|
|
|
|
case 0x0002: /* list PCI functions */
|
|
|
|
return clp_pci_list(req, (void *) lpcb);
|
|
|
|
case 0x0003: /* query PCI function */
|
|
|
|
return clp_pci_query(req, (void *) lpcb);
|
|
|
|
case 0x0004: /* query PCI function group */
|
|
|
|
return clp_pci_query_grp(req, (void *) lpcb);
|
|
|
|
default:
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static int clp_normal_command(struct clp_req *req)
|
|
|
|
{
|
|
|
|
struct clp_req_hdr *lpcb;
|
|
|
|
void __user *uptr;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
rc = -EINVAL;
|
|
|
|
if (req->lps != 0 && req->lps != 2)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
rc = -ENOMEM;
|
|
|
|
lpcb = clp_alloc_block(GFP_KERNEL);
|
|
|
|
if (!lpcb)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
rc = -EFAULT;
|
|
|
|
uptr = (void __force __user *)(unsigned long) req->data_p;
|
|
|
|
if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0)
|
|
|
|
goto out_free;
|
|
|
|
|
|
|
|
rc = -EINVAL;
|
|
|
|
if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0)
|
|
|
|
goto out_free;
|
|
|
|
|
|
|
|
switch (req->lps) {
|
|
|
|
case 0:
|
|
|
|
rc = clp_base_command(req, lpcb);
|
|
|
|
break;
|
|
|
|
case 2:
|
|
|
|
rc = clp_pci_command(req, lpcb);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (rc)
|
|
|
|
goto out_free;
|
|
|
|
|
|
|
|
rc = -EFAULT;
|
|
|
|
if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0)
|
|
|
|
goto out_free;
|
|
|
|
|
|
|
|
rc = 0;
|
|
|
|
|
|
|
|
out_free:
|
|
|
|
clp_free_block(lpcb);
|
|
|
|
out:
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int clp_immediate_command(struct clp_req *req)
|
|
|
|
{
|
|
|
|
void __user *uptr;
|
|
|
|
unsigned long ilp;
|
|
|
|
int exists;
|
|
|
|
|
|
|
|
if (req->cmd > 1 || clp_get_ilp(&ilp) != 0)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
uptr = (void __force __user *)(unsigned long) req->data_p;
|
|
|
|
if (req->cmd == 0) {
|
|
|
|
/* Command code 0: test for a specific processor */
|
|
|
|
exists = test_bit_inv(req->lps, &ilp);
|
|
|
|
return put_user(exists, (int __user *) uptr);
|
|
|
|
}
|
|
|
|
/* Command code 1: return bit mask of installed processors */
|
|
|
|
return put_user(ilp, (unsigned long __user *) uptr);
|
|
|
|
}
|
|
|
|
|
|
|
|
static long clp_misc_ioctl(struct file *filp, unsigned int cmd,
|
|
|
|
unsigned long arg)
|
|
|
|
{
|
|
|
|
struct clp_req req;
|
|
|
|
void __user *argp;
|
|
|
|
|
|
|
|
if (cmd != CLP_SYNC)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg;
|
|
|
|
if (copy_from_user(&req, argp, sizeof(req)))
|
|
|
|
return -EFAULT;
|
|
|
|
if (req.r != 0)
|
|
|
|
return -EINVAL;
|
|
|
|
return req.c ? clp_immediate_command(&req) : clp_normal_command(&req);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int clp_misc_release(struct inode *inode, struct file *filp)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct file_operations clp_misc_fops = {
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.open = nonseekable_open,
|
|
|
|
.release = clp_misc_release,
|
|
|
|
.unlocked_ioctl = clp_misc_ioctl,
|
|
|
|
.compat_ioctl = clp_misc_ioctl,
|
|
|
|
.llseek = no_llseek,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct miscdevice clp_misc_device = {
|
|
|
|
.minor = MISC_DYNAMIC_MINOR,
|
|
|
|
.name = "clp",
|
|
|
|
.fops = &clp_misc_fops,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init clp_misc_init(void)
|
|
|
|
{
|
|
|
|
return misc_register(&clp_misc_device);
|
|
|
|
}
|
|
|
|
|
|
|
|
device_initcall(clp_misc_init);
|