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756 lines
17 KiB
756 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2012-2020 IBM Corporation |
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* |
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* Author: Ashley Lai <[email protected]> |
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* |
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* Maintained by: <[email protected]> |
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* |
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* Device driver for TCG/TCPA TPM (trusted platform module). |
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* Specifications at www.trustedcomputinggroup.org |
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*/ |
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#include <linux/dma-mapping.h> |
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#include <linux/dmapool.h> |
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#include <linux/slab.h> |
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#include <asm/vio.h> |
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#include <asm/irq.h> |
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#include <linux/types.h> |
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#include <linux/list.h> |
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#include <linux/spinlock.h> |
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#include <linux/interrupt.h> |
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#include <linux/wait.h> |
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#include <asm/prom.h> |
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#include "tpm.h" |
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#include "tpm_ibmvtpm.h" |
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static const char tpm_ibmvtpm_driver_name[] = "tpm_ibmvtpm"; |
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static const struct vio_device_id tpm_ibmvtpm_device_table[] = { |
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{ "IBM,vtpm", "IBM,vtpm"}, |
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{ "IBM,vtpm", "IBM,vtpm20"}, |
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{ "", "" } |
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}; |
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MODULE_DEVICE_TABLE(vio, tpm_ibmvtpm_device_table); |
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/** |
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* ibmvtpm_send_crq_word() - Send a CRQ request |
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* @vdev: vio device struct |
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* @w1: pre-constructed first word of tpm crq (second word is reserved) |
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* |
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* Return: |
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* 0 - Success |
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* Non-zero - Failure |
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*/ |
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static int ibmvtpm_send_crq_word(struct vio_dev *vdev, u64 w1) |
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{ |
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return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, w1, 0); |
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} |
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/** |
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* ibmvtpm_send_crq() - Send a CRQ request |
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* |
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* @vdev: vio device struct |
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* @valid: Valid field |
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* @msg: Type field |
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* @len: Length field |
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* @data: Data field |
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* |
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* The ibmvtpm crq is defined as follows: |
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* |
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* Byte | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
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* ----------------------------------------------------------------------- |
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* Word0 | Valid | Type | Length | Data |
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* ----------------------------------------------------------------------- |
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* Word1 | Reserved |
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* ----------------------------------------------------------------------- |
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* |
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* Which matches the following structure (on bigendian host): |
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* |
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* struct ibmvtpm_crq { |
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* u8 valid; |
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* u8 msg; |
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* __be16 len; |
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* __be32 data; |
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* __be64 reserved; |
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* } __attribute__((packed, aligned(8))); |
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* |
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* However, the value is passed in a register so just compute the numeric value |
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* to load into the register avoiding byteswap altogether. Endian only affects |
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* memory loads and stores - registers are internally represented the same. |
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* |
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* Return: |
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* 0 (H_SUCCESS) - Success |
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* Non-zero - Failure |
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*/ |
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static int ibmvtpm_send_crq(struct vio_dev *vdev, |
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u8 valid, u8 msg, u16 len, u32 data) |
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{ |
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u64 w1 = ((u64)valid << 56) | ((u64)msg << 48) | ((u64)len << 32) | |
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(u64)data; |
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return ibmvtpm_send_crq_word(vdev, w1); |
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} |
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/** |
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* tpm_ibmvtpm_recv - Receive data after send |
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* |
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* @chip: tpm chip struct |
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* @buf: buffer to read |
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* @count: size of buffer |
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* |
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* Return: |
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* Number of bytes read |
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*/ |
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static int tpm_ibmvtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count) |
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{ |
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struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev); |
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u16 len; |
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if (!ibmvtpm->rtce_buf) { |
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dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n"); |
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return 0; |
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} |
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len = ibmvtpm->res_len; |
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if (count < len) { |
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dev_err(ibmvtpm->dev, |
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"Invalid size in recv: count=%zd, crq_size=%d\n", |
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count, len); |
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return -EIO; |
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} |
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spin_lock(&ibmvtpm->rtce_lock); |
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memcpy((void *)buf, (void *)ibmvtpm->rtce_buf, len); |
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memset(ibmvtpm->rtce_buf, 0, len); |
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ibmvtpm->res_len = 0; |
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spin_unlock(&ibmvtpm->rtce_lock); |
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return len; |
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} |
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/** |
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* ibmvtpm_crq_send_init - Send a CRQ initialize message |
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* @ibmvtpm: vtpm device struct |
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* |
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* Return: |
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* 0 on success. |
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* Non-zero on failure. |
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*/ |
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static int ibmvtpm_crq_send_init(struct ibmvtpm_dev *ibmvtpm) |
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{ |
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int rc; |
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rc = ibmvtpm_send_crq_word(ibmvtpm->vdev, INIT_CRQ_CMD); |
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if (rc != H_SUCCESS) |
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dev_err(ibmvtpm->dev, |
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"%s failed rc=%d\n", __func__, rc); |
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return rc; |
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} |
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/** |
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* tpm_ibmvtpm_resume - Resume from suspend |
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* |
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* @dev: device struct |
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* |
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* Return: Always 0. |
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*/ |
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static int tpm_ibmvtpm_resume(struct device *dev) |
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{ |
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struct tpm_chip *chip = dev_get_drvdata(dev); |
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struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev); |
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int rc = 0; |
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do { |
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if (rc) |
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msleep(100); |
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rc = plpar_hcall_norets(H_ENABLE_CRQ, |
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ibmvtpm->vdev->unit_address); |
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} while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc)); |
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if (rc) { |
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dev_err(dev, "Error enabling ibmvtpm rc=%d\n", rc); |
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return rc; |
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} |
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rc = vio_enable_interrupts(ibmvtpm->vdev); |
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if (rc) { |
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dev_err(dev, "Error vio_enable_interrupts rc=%d\n", rc); |
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return rc; |
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} |
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rc = ibmvtpm_crq_send_init(ibmvtpm); |
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if (rc) |
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dev_err(dev, "Error send_init rc=%d\n", rc); |
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return rc; |
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} |
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/** |
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* tpm_ibmvtpm_send() - Send a TPM command |
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* @chip: tpm chip struct |
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* @buf: buffer contains data to send |
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* @count: size of buffer |
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* |
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* Return: |
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* 0 on success, |
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* -errno on error |
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*/ |
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static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count) |
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{ |
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struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev); |
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bool retry = true; |
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int rc, sig; |
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if (!ibmvtpm->rtce_buf) { |
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dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n"); |
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return 0; |
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} |
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if (count > ibmvtpm->rtce_size) { |
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dev_err(ibmvtpm->dev, |
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"Invalid size in send: count=%zd, rtce_size=%d\n", |
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count, ibmvtpm->rtce_size); |
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return -EIO; |
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} |
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if (ibmvtpm->tpm_processing_cmd) { |
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dev_info(ibmvtpm->dev, |
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"Need to wait for TPM to finish\n"); |
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/* wait for previous command to finish */ |
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sig = wait_event_interruptible(ibmvtpm->wq, !ibmvtpm->tpm_processing_cmd); |
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if (sig) |
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return -EINTR; |
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} |
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spin_lock(&ibmvtpm->rtce_lock); |
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ibmvtpm->res_len = 0; |
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memcpy((void *)ibmvtpm->rtce_buf, (void *)buf, count); |
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/* |
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* set the processing flag before the Hcall, since we may get the |
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* result (interrupt) before even being able to check rc. |
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*/ |
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ibmvtpm->tpm_processing_cmd = 1; |
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again: |
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rc = ibmvtpm_send_crq(ibmvtpm->vdev, |
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IBMVTPM_VALID_CMD, VTPM_TPM_COMMAND, |
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count, ibmvtpm->rtce_dma_handle); |
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if (rc != H_SUCCESS) { |
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/* |
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* H_CLOSED can be returned after LPM resume. Call |
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* tpm_ibmvtpm_resume() to re-enable the CRQ then retry |
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* ibmvtpm_send_crq() once before failing. |
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*/ |
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if (rc == H_CLOSED && retry) { |
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tpm_ibmvtpm_resume(ibmvtpm->dev); |
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retry = false; |
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goto again; |
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} |
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dev_err(ibmvtpm->dev, "tpm_ibmvtpm_send failed rc=%d\n", rc); |
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ibmvtpm->tpm_processing_cmd = 0; |
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} |
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spin_unlock(&ibmvtpm->rtce_lock); |
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return 0; |
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} |
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static void tpm_ibmvtpm_cancel(struct tpm_chip *chip) |
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{ |
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return; |
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} |
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static u8 tpm_ibmvtpm_status(struct tpm_chip *chip) |
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{ |
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struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev); |
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return ibmvtpm->tpm_processing_cmd; |
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} |
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/** |
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* ibmvtpm_crq_get_rtce_size - Send a CRQ request to get rtce size |
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* |
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* @ibmvtpm: vtpm device struct |
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* |
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* Return: |
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* 0 on success. |
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* Non-zero on failure. |
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*/ |
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static int ibmvtpm_crq_get_rtce_size(struct ibmvtpm_dev *ibmvtpm) |
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{ |
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int rc; |
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rc = ibmvtpm_send_crq(ibmvtpm->vdev, |
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IBMVTPM_VALID_CMD, VTPM_GET_RTCE_BUFFER_SIZE, 0, 0); |
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if (rc != H_SUCCESS) |
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dev_err(ibmvtpm->dev, |
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"ibmvtpm_crq_get_rtce_size failed rc=%d\n", rc); |
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return rc; |
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} |
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/** |
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* ibmvtpm_crq_get_version - Send a CRQ request to get vtpm version |
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* - Note that this is vtpm version and not tpm version |
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* |
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* @ibmvtpm: vtpm device struct |
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* |
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* Return: |
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* 0 on success. |
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* Non-zero on failure. |
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*/ |
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static int ibmvtpm_crq_get_version(struct ibmvtpm_dev *ibmvtpm) |
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{ |
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int rc; |
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rc = ibmvtpm_send_crq(ibmvtpm->vdev, |
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IBMVTPM_VALID_CMD, VTPM_GET_VERSION, 0, 0); |
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if (rc != H_SUCCESS) |
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dev_err(ibmvtpm->dev, |
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"ibmvtpm_crq_get_version failed rc=%d\n", rc); |
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return rc; |
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} |
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/** |
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* ibmvtpm_crq_send_init_complete - Send a CRQ initialize complete message |
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* @ibmvtpm: vtpm device struct |
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* |
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* Return: |
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* 0 on success. |
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* Non-zero on failure. |
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*/ |
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static int ibmvtpm_crq_send_init_complete(struct ibmvtpm_dev *ibmvtpm) |
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{ |
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int rc; |
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rc = ibmvtpm_send_crq_word(ibmvtpm->vdev, INIT_CRQ_COMP_CMD); |
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if (rc != H_SUCCESS) |
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dev_err(ibmvtpm->dev, |
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"ibmvtpm_crq_send_init_complete failed rc=%d\n", rc); |
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return rc; |
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} |
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/** |
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* tpm_ibmvtpm_remove - ibm vtpm remove entry point |
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* @vdev: vio device struct |
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* |
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* Return: Always 0. |
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*/ |
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static void tpm_ibmvtpm_remove(struct vio_dev *vdev) |
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{ |
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struct tpm_chip *chip = dev_get_drvdata(&vdev->dev); |
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struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev); |
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int rc = 0; |
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tpm_chip_unregister(chip); |
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free_irq(vdev->irq, ibmvtpm); |
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do { |
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if (rc) |
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msleep(100); |
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rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); |
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} while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); |
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dma_unmap_single(ibmvtpm->dev, ibmvtpm->crq_dma_handle, |
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CRQ_RES_BUF_SIZE, DMA_BIDIRECTIONAL); |
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free_page((unsigned long)ibmvtpm->crq_queue.crq_addr); |
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if (ibmvtpm->rtce_buf) { |
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dma_unmap_single(ibmvtpm->dev, ibmvtpm->rtce_dma_handle, |
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ibmvtpm->rtce_size, DMA_BIDIRECTIONAL); |
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kfree(ibmvtpm->rtce_buf); |
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} |
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kfree(ibmvtpm); |
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/* For tpm_ibmvtpm_get_desired_dma */ |
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dev_set_drvdata(&vdev->dev, NULL); |
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} |
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/** |
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* tpm_ibmvtpm_get_desired_dma - Get DMA size needed by this driver |
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* @vdev: vio device struct |
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* |
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* Return: |
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* Number of bytes the driver needs to DMA map. |
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*/ |
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static unsigned long tpm_ibmvtpm_get_desired_dma(struct vio_dev *vdev) |
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{ |
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struct tpm_chip *chip = dev_get_drvdata(&vdev->dev); |
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struct ibmvtpm_dev *ibmvtpm; |
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/* |
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* ibmvtpm initializes at probe time, so the data we are |
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* asking for may not be set yet. Estimate that 4K required |
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* for TCE-mapped buffer in addition to CRQ. |
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*/ |
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if (chip) |
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ibmvtpm = dev_get_drvdata(&chip->dev); |
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else |
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return CRQ_RES_BUF_SIZE + PAGE_SIZE; |
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return CRQ_RES_BUF_SIZE + ibmvtpm->rtce_size; |
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} |
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/** |
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* tpm_ibmvtpm_suspend - Suspend |
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* @dev: device struct |
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* |
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* Return: Always 0. |
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*/ |
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static int tpm_ibmvtpm_suspend(struct device *dev) |
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{ |
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struct tpm_chip *chip = dev_get_drvdata(dev); |
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struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev); |
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int rc = 0; |
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rc = ibmvtpm_send_crq(ibmvtpm->vdev, |
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IBMVTPM_VALID_CMD, VTPM_PREPARE_TO_SUSPEND, 0, 0); |
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if (rc != H_SUCCESS) |
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dev_err(ibmvtpm->dev, |
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"tpm_ibmvtpm_suspend failed rc=%d\n", rc); |
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return rc; |
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} |
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/** |
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* ibmvtpm_reset_crq - Reset CRQ |
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* |
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* @ibmvtpm: ibm vtpm struct |
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* |
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* Return: |
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* 0 on success. |
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* Non-zero on failure. |
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*/ |
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static int ibmvtpm_reset_crq(struct ibmvtpm_dev *ibmvtpm) |
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{ |
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int rc = 0; |
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do { |
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if (rc) |
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msleep(100); |
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rc = plpar_hcall_norets(H_FREE_CRQ, |
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ibmvtpm->vdev->unit_address); |
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} while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); |
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memset(ibmvtpm->crq_queue.crq_addr, 0, CRQ_RES_BUF_SIZE); |
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ibmvtpm->crq_queue.index = 0; |
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return plpar_hcall_norets(H_REG_CRQ, ibmvtpm->vdev->unit_address, |
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ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE); |
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} |
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static bool tpm_ibmvtpm_req_canceled(struct tpm_chip *chip, u8 status) |
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{ |
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return (status == 0); |
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} |
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static const struct tpm_class_ops tpm_ibmvtpm = { |
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.recv = tpm_ibmvtpm_recv, |
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.send = tpm_ibmvtpm_send, |
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.cancel = tpm_ibmvtpm_cancel, |
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.status = tpm_ibmvtpm_status, |
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.req_complete_mask = 1, |
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.req_complete_val = 0, |
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.req_canceled = tpm_ibmvtpm_req_canceled, |
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}; |
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static const struct dev_pm_ops tpm_ibmvtpm_pm_ops = { |
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.suspend = tpm_ibmvtpm_suspend, |
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.resume = tpm_ibmvtpm_resume, |
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}; |
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/** |
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* ibmvtpm_crq_get_next - Get next responded crq |
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* |
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* @ibmvtpm: vtpm device struct |
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* |
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* Return: vtpm crq pointer or NULL. |
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*/ |
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static struct ibmvtpm_crq *ibmvtpm_crq_get_next(struct ibmvtpm_dev *ibmvtpm) |
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{ |
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struct ibmvtpm_crq_queue *crq_q = &ibmvtpm->crq_queue; |
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struct ibmvtpm_crq *crq = &crq_q->crq_addr[crq_q->index]; |
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if (crq->valid & VTPM_MSG_RES) { |
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if (++crq_q->index == crq_q->num_entry) |
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crq_q->index = 0; |
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smp_rmb(); |
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} else |
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crq = NULL; |
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return crq; |
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} |
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/** |
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* ibmvtpm_crq_process - Process responded crq |
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* |
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* @crq: crq to be processed |
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* @ibmvtpm: vtpm device struct |
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* |
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*/ |
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static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq, |
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struct ibmvtpm_dev *ibmvtpm) |
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{ |
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int rc = 0; |
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switch (crq->valid) { |
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case VALID_INIT_CRQ: |
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switch (crq->msg) { |
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case INIT_CRQ_RES: |
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dev_info(ibmvtpm->dev, "CRQ initialized\n"); |
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rc = ibmvtpm_crq_send_init_complete(ibmvtpm); |
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if (rc) |
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dev_err(ibmvtpm->dev, "Unable to send CRQ init complete rc=%d\n", rc); |
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return; |
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case INIT_CRQ_COMP_RES: |
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dev_info(ibmvtpm->dev, |
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"CRQ initialization completed\n"); |
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return; |
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default: |
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dev_err(ibmvtpm->dev, "Unknown crq message type: %d\n", crq->msg); |
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return; |
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} |
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case IBMVTPM_VALID_CMD: |
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switch (crq->msg) { |
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case VTPM_GET_RTCE_BUFFER_SIZE_RES: |
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if (be16_to_cpu(crq->len) <= 0) { |
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dev_err(ibmvtpm->dev, "Invalid rtce size\n"); |
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return; |
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} |
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ibmvtpm->rtce_size = be16_to_cpu(crq->len); |
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ibmvtpm->rtce_buf = kmalloc(ibmvtpm->rtce_size, |
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GFP_ATOMIC); |
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if (!ibmvtpm->rtce_buf) { |
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dev_err(ibmvtpm->dev, "Failed to allocate memory for rtce buffer\n"); |
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return; |
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} |
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ibmvtpm->rtce_dma_handle = dma_map_single(ibmvtpm->dev, |
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ibmvtpm->rtce_buf, ibmvtpm->rtce_size, |
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DMA_BIDIRECTIONAL); |
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if (dma_mapping_error(ibmvtpm->dev, |
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ibmvtpm->rtce_dma_handle)) { |
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kfree(ibmvtpm->rtce_buf); |
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ibmvtpm->rtce_buf = NULL; |
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dev_err(ibmvtpm->dev, "Failed to dma map rtce buffer\n"); |
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} |
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return; |
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case VTPM_GET_VERSION_RES: |
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ibmvtpm->vtpm_version = be32_to_cpu(crq->data); |
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return; |
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case VTPM_TPM_COMMAND_RES: |
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/* len of the data in rtce buffer */ |
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ibmvtpm->res_len = be16_to_cpu(crq->len); |
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ibmvtpm->tpm_processing_cmd = 0; |
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wake_up_interruptible(&ibmvtpm->wq); |
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return; |
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default: |
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return; |
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} |
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} |
|
return; |
|
} |
|
|
|
/** |
|
* ibmvtpm_interrupt - Interrupt handler |
|
* |
|
* @irq: irq number to handle |
|
* @vtpm_instance: vtpm that received interrupt |
|
* |
|
* Returns: |
|
* IRQ_HANDLED |
|
**/ |
|
static irqreturn_t ibmvtpm_interrupt(int irq, void *vtpm_instance) |
|
{ |
|
struct ibmvtpm_dev *ibmvtpm = (struct ibmvtpm_dev *) vtpm_instance; |
|
struct ibmvtpm_crq *crq; |
|
|
|
/* while loop is needed for initial setup (get version and |
|
* get rtce_size). There should be only one tpm request at any |
|
* given time. |
|
*/ |
|
while ((crq = ibmvtpm_crq_get_next(ibmvtpm)) != NULL) { |
|
ibmvtpm_crq_process(crq, ibmvtpm); |
|
wake_up_interruptible(&ibmvtpm->crq_queue.wq); |
|
crq->valid = 0; |
|
smp_wmb(); |
|
} |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
/** |
|
* tpm_ibmvtpm_probe - ibm vtpm initialize entry point |
|
* |
|
* @vio_dev: vio device struct |
|
* @id: vio device id struct |
|
* |
|
* Return: |
|
* 0 on success. |
|
* Non-zero on failure. |
|
*/ |
|
static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev, |
|
const struct vio_device_id *id) |
|
{ |
|
struct ibmvtpm_dev *ibmvtpm; |
|
struct device *dev = &vio_dev->dev; |
|
struct ibmvtpm_crq_queue *crq_q; |
|
struct tpm_chip *chip; |
|
int rc = -ENOMEM, rc1; |
|
|
|
chip = tpmm_chip_alloc(dev, &tpm_ibmvtpm); |
|
if (IS_ERR(chip)) |
|
return PTR_ERR(chip); |
|
|
|
ibmvtpm = kzalloc(sizeof(struct ibmvtpm_dev), GFP_KERNEL); |
|
if (!ibmvtpm) { |
|
dev_err(dev, "kzalloc for ibmvtpm failed\n"); |
|
goto cleanup; |
|
} |
|
|
|
ibmvtpm->dev = dev; |
|
ibmvtpm->vdev = vio_dev; |
|
|
|
crq_q = &ibmvtpm->crq_queue; |
|
crq_q->crq_addr = (struct ibmvtpm_crq *)get_zeroed_page(GFP_KERNEL); |
|
if (!crq_q->crq_addr) { |
|
dev_err(dev, "Unable to allocate memory for crq_addr\n"); |
|
goto cleanup; |
|
} |
|
|
|
crq_q->num_entry = CRQ_RES_BUF_SIZE / sizeof(*crq_q->crq_addr); |
|
init_waitqueue_head(&crq_q->wq); |
|
ibmvtpm->crq_dma_handle = dma_map_single(dev, crq_q->crq_addr, |
|
CRQ_RES_BUF_SIZE, |
|
DMA_BIDIRECTIONAL); |
|
|
|
if (dma_mapping_error(dev, ibmvtpm->crq_dma_handle)) { |
|
dev_err(dev, "dma mapping failed\n"); |
|
goto cleanup; |
|
} |
|
|
|
rc = plpar_hcall_norets(H_REG_CRQ, vio_dev->unit_address, |
|
ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE); |
|
if (rc == H_RESOURCE) |
|
rc = ibmvtpm_reset_crq(ibmvtpm); |
|
|
|
if (rc) { |
|
dev_err(dev, "Unable to register CRQ rc=%d\n", rc); |
|
goto reg_crq_cleanup; |
|
} |
|
|
|
rc = request_irq(vio_dev->irq, ibmvtpm_interrupt, 0, |
|
tpm_ibmvtpm_driver_name, ibmvtpm); |
|
if (rc) { |
|
dev_err(dev, "Error %d register irq 0x%x\n", rc, vio_dev->irq); |
|
goto init_irq_cleanup; |
|
} |
|
|
|
rc = vio_enable_interrupts(vio_dev); |
|
if (rc) { |
|
dev_err(dev, "Error %d enabling interrupts\n", rc); |
|
goto init_irq_cleanup; |
|
} |
|
|
|
init_waitqueue_head(&ibmvtpm->wq); |
|
|
|
crq_q->index = 0; |
|
|
|
dev_set_drvdata(&chip->dev, ibmvtpm); |
|
|
|
spin_lock_init(&ibmvtpm->rtce_lock); |
|
|
|
rc = ibmvtpm_crq_send_init(ibmvtpm); |
|
if (rc) |
|
goto init_irq_cleanup; |
|
|
|
rc = ibmvtpm_crq_get_version(ibmvtpm); |
|
if (rc) |
|
goto init_irq_cleanup; |
|
|
|
rc = ibmvtpm_crq_get_rtce_size(ibmvtpm); |
|
if (rc) |
|
goto init_irq_cleanup; |
|
|
|
if (!wait_event_timeout(ibmvtpm->crq_queue.wq, |
|
ibmvtpm->rtce_buf != NULL, |
|
HZ)) { |
|
dev_err(dev, "CRQ response timed out\n"); |
|
goto init_irq_cleanup; |
|
} |
|
|
|
|
|
if (!strcmp(id->compat, "IBM,vtpm20")) |
|
chip->flags |= TPM_CHIP_FLAG_TPM2; |
|
|
|
rc = tpm_get_timeouts(chip); |
|
if (rc) |
|
goto init_irq_cleanup; |
|
|
|
if (chip->flags & TPM_CHIP_FLAG_TPM2) { |
|
rc = tpm2_get_cc_attrs_tbl(chip); |
|
if (rc) |
|
goto init_irq_cleanup; |
|
} |
|
|
|
return tpm_chip_register(chip); |
|
init_irq_cleanup: |
|
do { |
|
rc1 = plpar_hcall_norets(H_FREE_CRQ, vio_dev->unit_address); |
|
} while (rc1 == H_BUSY || H_IS_LONG_BUSY(rc1)); |
|
reg_crq_cleanup: |
|
dma_unmap_single(dev, ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE, |
|
DMA_BIDIRECTIONAL); |
|
cleanup: |
|
if (ibmvtpm) { |
|
if (crq_q->crq_addr) |
|
free_page((unsigned long)crq_q->crq_addr); |
|
kfree(ibmvtpm); |
|
} |
|
|
|
return rc; |
|
} |
|
|
|
static struct vio_driver ibmvtpm_driver = { |
|
.id_table = tpm_ibmvtpm_device_table, |
|
.probe = tpm_ibmvtpm_probe, |
|
.remove = tpm_ibmvtpm_remove, |
|
.get_desired_dma = tpm_ibmvtpm_get_desired_dma, |
|
.name = tpm_ibmvtpm_driver_name, |
|
.pm = &tpm_ibmvtpm_pm_ops, |
|
}; |
|
|
|
/** |
|
* ibmvtpm_module_init - Initialize ibm vtpm module. |
|
* |
|
* |
|
* Return: |
|
* 0 on success. |
|
* Non-zero on failure. |
|
*/ |
|
static int __init ibmvtpm_module_init(void) |
|
{ |
|
return vio_register_driver(&ibmvtpm_driver); |
|
} |
|
|
|
/** |
|
* ibmvtpm_module_exit - Tear down ibm vtpm module. |
|
*/ |
|
static void __exit ibmvtpm_module_exit(void) |
|
{ |
|
vio_unregister_driver(&ibmvtpm_driver); |
|
} |
|
|
|
module_init(ibmvtpm_module_init); |
|
module_exit(ibmvtpm_module_exit); |
|
|
|
MODULE_AUTHOR("[email protected]"); |
|
MODULE_DESCRIPTION("IBM vTPM Driver"); |
|
MODULE_VERSION("1.0"); |
|
MODULE_LICENSE("GPL");
|
|
|