s390/pci: add ioctl interface for CLP
Provide a user space interface to issue call logical-processor instructions. Only selected CLP commands are allowed, enough to get the full overview of the installed PCI functions. Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
@@ -8,13 +8,19 @@
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#define KMSG_COMPONENT "zpci"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/compat.h>
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#include <linux/kernel.h>
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#include <linux/miscdevice.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 <linux/uaccess.h>
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#include <asm/pci_debug.h>
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#include <asm/pci_clp.h>
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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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static inline void zpci_err_clp(unsigned int rsp, int rc)
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{
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@@ -27,21 +33,43 @@ static inline void zpci_err_clp(unsigned int rsp, int rc)
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}
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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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* 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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*/
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static inline u8 clp_instr(void *data)
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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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{
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struct { u8 _[CLP_BLK_SIZE]; } *req = data;
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u64 ignored;
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u8 cc;
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int cc = 3;
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asm volatile (
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" .insn rrf,0xb9a00000,%[ign],%[req],0x0,0x2\n"
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" ipm %[cc]\n"
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" .insn rrf,0xb9a00000,%[ign],%[req],0,%[lps]\n"
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"0: ipm %[cc]\n"
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" srl %[cc],28\n"
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: [cc] "=d" (cc), [ign] "=d" (ignored), "+m" (*req)
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: [req] "a" (req)
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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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: "cc");
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return cc;
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}
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@@ -90,7 +118,7 @@ static int clp_query_pci_fngrp(struct zpci_dev *zdev, u8 pfgid)
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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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rc = clp_req(rrb, CLP_LPS_PCI);
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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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@@ -143,7 +171,7 @@ static int clp_query_pci_fn(struct zpci_dev *zdev, u32 fh)
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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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rc = clp_req(rrb, CLP_LPS_PCI);
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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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@@ -214,7 +242,7 @@ static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command)
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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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rc = clp_req(rrb, CLP_LPS_PCI);
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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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@@ -280,7 +308,7 @@ static int clp_list_pci(struct clp_req_rsp_list_pci *rrb,
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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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rc = clp_req(rrb, CLP_LPS_PCI);
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if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
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zpci_err("List PCI FN:\n");
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zpci_err_clp(rrb->response.hdr.rsp, rc);
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@@ -391,3 +419,198 @@ int clp_rescan_pci_devices_simple(void)
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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_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
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{
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unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
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if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
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lpcb->response.hdr.len > limit)
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return -EINVAL;
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return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0;
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}
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static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
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{
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switch (lpcb->cmd) {
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case 0x0001: /* store logical-processor characteristics */
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return clp_base_slpc(req, (void *) lpcb);
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default:
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return -EINVAL;
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}
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}
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static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
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{
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unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
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if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
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lpcb->response.hdr.len > limit)
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return -EINVAL;
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return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
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}
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static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb)
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{
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unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
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if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
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lpcb->response.hdr.len > limit)
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return -EINVAL;
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if (lpcb->request.reserved2 != 0)
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return -EINVAL;
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return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
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}
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static int clp_pci_query(struct clp_req *req,
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struct clp_req_rsp_query_pci *lpcb)
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{
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unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
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if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
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lpcb->response.hdr.len > limit)
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return -EINVAL;
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if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0)
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return -EINVAL;
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return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
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}
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static int clp_pci_query_grp(struct clp_req *req,
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struct clp_req_rsp_query_pci_grp *lpcb)
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{
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unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
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if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
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lpcb->response.hdr.len > limit)
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return -EINVAL;
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if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0 ||
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lpcb->request.reserved4 != 0)
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return -EINVAL;
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return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
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}
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static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
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{
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switch (lpcb->cmd) {
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case 0x0001: /* store logical-processor characteristics */
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return clp_pci_slpc(req, (void *) lpcb);
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case 0x0002: /* list PCI functions */
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return clp_pci_list(req, (void *) lpcb);
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case 0x0003: /* query PCI function */
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return clp_pci_query(req, (void *) lpcb);
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case 0x0004: /* query PCI function group */
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return clp_pci_query_grp(req, (void *) lpcb);
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default:
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return -EINVAL;
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}
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}
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static int clp_normal_command(struct clp_req *req)
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{
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struct clp_req_hdr *lpcb;
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void __user *uptr;
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int rc;
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rc = -EINVAL;
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if (req->lps != 0 && req->lps != 2)
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goto out;
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rc = -ENOMEM;
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lpcb = clp_alloc_block(GFP_KERNEL);
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if (!lpcb)
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goto out;
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rc = -EFAULT;
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uptr = (void __force __user *)(unsigned long) req->data_p;
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if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0)
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goto out_free;
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rc = -EINVAL;
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if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0)
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goto out_free;
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switch (req->lps) {
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case 0:
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rc = clp_base_command(req, lpcb);
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break;
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case 2:
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rc = clp_pci_command(req, lpcb);
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break;
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}
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if (rc)
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goto out_free;
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rc = -EFAULT;
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if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0)
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goto out_free;
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rc = 0;
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out_free:
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clp_free_block(lpcb);
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out:
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return rc;
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}
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static int clp_immediate_command(struct clp_req *req)
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{
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void __user *uptr;
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unsigned long ilp;
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int exists;
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if (req->cmd > 1 || clp_get_ilp(&ilp) != 0)
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return -EINVAL;
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uptr = (void __force __user *)(unsigned long) req->data_p;
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if (req->cmd == 0) {
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/* Command code 0: test for a specific processor */
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exists = test_bit_inv(req->lps, &ilp);
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return put_user(exists, (int __user *) uptr);
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}
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/* Command code 1: return bit mask of installed processors */
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return put_user(ilp, (unsigned long __user *) uptr);
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}
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static long clp_misc_ioctl(struct file *filp, unsigned int cmd,
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unsigned long arg)
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{
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struct clp_req req;
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void __user *argp;
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if (cmd != CLP_SYNC)
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return -EINVAL;
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argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg;
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if (copy_from_user(&req, argp, sizeof(req)))
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return -EFAULT;
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if (req.r != 0)
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return -EINVAL;
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return req.c ? clp_immediate_command(&req) : clp_normal_command(&req);
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}
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static int clp_misc_release(struct inode *inode, struct file *filp)
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{
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return 0;
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}
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static const struct file_operations clp_misc_fops = {
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.owner = THIS_MODULE,
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.open = nonseekable_open,
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.release = clp_misc_release,
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.unlocked_ioctl = clp_misc_ioctl,
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.compat_ioctl = clp_misc_ioctl,
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.llseek = no_llseek,
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};
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static struct miscdevice clp_misc_device = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "clp",
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.fops = &clp_misc_fops,
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};
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static int __init clp_misc_init(void)
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{
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return misc_register(&clp_misc_device);
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}
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device_initcall(clp_misc_init);
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