static long genwqe_ioctl()

in genwqe/card_dev.c [1052:1227]

• 119 lines of code
• 43 McCabe index (conditional complexity)

static long genwqe_ioctl(struct file *filp, unsigned int cmd,
			 unsigned long arg)
{
	int rc = 0;
	struct genwqe_file *cfile = (struct genwqe_file *)filp->private_data;
	struct genwqe_dev *cd = cfile->cd;
	struct pci_dev *pci_dev = cd->pci_dev;
	struct genwqe_reg_io __user *io;
	u64 val;
	u32 reg_offs;

	/* Return -EIO if card hit EEH */
	if (pci_channel_offline(pci_dev))
		return -EIO;

	if (_IOC_TYPE(cmd) != GENWQE_IOC_CODE)
		return -EINVAL;

	switch (cmd) {

	case GENWQE_GET_CARD_STATE:
		put_user(cd->card_state, (enum genwqe_card_state __user *)arg);
		return 0;

		/* Register access */
	case GENWQE_READ_REG64: {
		io = (struct genwqe_reg_io __user *)arg;

		if (get_user(reg_offs, &io->num))
			return -EFAULT;

		if ((reg_offs >= cd->mmio_len) || (reg_offs & 0x7))
			return -EINVAL;

		val = __genwqe_readq(cd, reg_offs);
		put_user(val, &io->val64);
		return 0;
	}

	case GENWQE_WRITE_REG64: {
		io = (struct genwqe_reg_io __user *)arg;

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
			return -EPERM;

		if (get_user(reg_offs, &io->num))
			return -EFAULT;

		if ((reg_offs >= cd->mmio_len) || (reg_offs & 0x7))
			return -EINVAL;

		if (get_user(val, &io->val64))
			return -EFAULT;

		__genwqe_writeq(cd, reg_offs, val);
		return 0;
	}

	case GENWQE_READ_REG32: {
		io = (struct genwqe_reg_io __user *)arg;

		if (get_user(reg_offs, &io->num))
			return -EFAULT;

		if ((reg_offs >= cd->mmio_len) || (reg_offs & 0x3))
			return -EINVAL;

		val = __genwqe_readl(cd, reg_offs);
		put_user(val, &io->val64);
		return 0;
	}

	case GENWQE_WRITE_REG32: {
		io = (struct genwqe_reg_io __user *)arg;

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
			return -EPERM;

		if (get_user(reg_offs, &io->num))
			return -EFAULT;

		if ((reg_offs >= cd->mmio_len) || (reg_offs & 0x3))
			return -EINVAL;

		if (get_user(val, &io->val64))
			return -EFAULT;

		__genwqe_writel(cd, reg_offs, val);
		return 0;
	}

		/* Flash update/reading */
	case GENWQE_SLU_UPDATE: {
		struct genwqe_bitstream load;

		if (!genwqe_is_privileged(cd))
			return -EPERM;

		if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
			return -EPERM;

		if (copy_from_user(&load, (void __user *)arg,
				   sizeof(load)))
			return -EFAULT;

		rc = do_flash_update(cfile, &load);

		if (copy_to_user((void __user *)arg, &load, sizeof(load)))
			return -EFAULT;

		return rc;
	}

	case GENWQE_SLU_READ: {
		struct genwqe_bitstream load;

		if (!genwqe_is_privileged(cd))
			return -EPERM;

		if (genwqe_flash_readback_fails(cd))
			return -ENOSPC;	 /* known to fail for old versions */

		if (copy_from_user(&load, (void __user *)arg, sizeof(load)))
			return -EFAULT;

		rc = do_flash_read(cfile, &load);

		if (copy_to_user((void __user *)arg, &load, sizeof(load)))
			return -EFAULT;

		return rc;
	}

		/* memory pinning and unpinning */
	case GENWQE_PIN_MEM: {
		struct genwqe_mem m;

		if (copy_from_user(&m, (void __user *)arg, sizeof(m)))
			return -EFAULT;

		return genwqe_pin_mem(cfile, &m);
	}

	case GENWQE_UNPIN_MEM: {
		struct genwqe_mem m;

		if (copy_from_user(&m, (void __user *)arg, sizeof(m)))
			return -EFAULT;

		return genwqe_unpin_mem(cfile, &m);
	}

		/* launch an DDCB and wait for completion */
	case GENWQE_EXECUTE_DDCB:
		return do_execute_ddcb(cfile, arg, 0);

	case GENWQE_EXECUTE_RAW_DDCB: {

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		return do_execute_ddcb(cfile, arg, 1);
	}

	default:
		return -EINVAL;
	}

	return rc;
}