mptctl.c

linux 内核源代码

			iocp->name);
		return -EBADRQC;
	} else if (iocstat == MPI_IOCSTATUS_BUSY) {
		printk(MYIOC_s_WARN_FMT "IOC_BUSY!\n", iocp->name);
		printk(MYIOC_s_WARN_FMT "(try again later?)\n", iocp->name);
		return -EBUSY;
	} else {
		printk(MYIOC_s_WARN_FMT "ioctl_fwdl() returned [bad] status = %04xh\n",
			iocp->name, iocstat);
		printk(MYIOC_s_WARN_FMT "(bad VooDoo)\n", iocp->name);
		return -ENOMSG;
	}
	return 0;

fwdl_out:
        kfree_sgl(sgl, sgl_dma, buflist, iocp);
	return ret;
}

/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
/*
 * SGE Allocation routine
 *
 * Inputs:	bytes - number of bytes to be transferred
 *		sgdir - data direction
 *		sge_offset - offset (in bytes) from the start of the request
 *			frame to the first SGE
 *		ioc - pointer to the mptadapter
 * Outputs:	frags - number of scatter gather elements
 *		blp - point to the buflist pointer
 *		sglbuf_dma - pointer to the (dma) sgl
 * Returns:	Null if failes
 *		pointer to the (virtual) sgl if successful.
 */
static MptSge_t *
kbuf_alloc_2_sgl(int bytes, u32 sgdir, int sge_offset, int *frags,
		 struct buflist **blp, dma_addr_t *sglbuf_dma, MPT_ADAPTER *ioc)
{
	MptSge_t	*sglbuf = NULL;		/* pointer to array of SGE */
						/* and chain buffers */
	struct buflist	*buflist = NULL;	/* kernel routine */
	MptSge_t	*sgl;
	int		 numfrags = 0;
	int		 fragcnt = 0;
	int		 alloc_sz = min(bytes,MAX_KMALLOC_SZ);	// avoid kernel warning msg!
	int		 bytes_allocd = 0;
	int		 this_alloc;
	dma_addr_t	 pa;					// phys addr
	int		 i, buflist_ent;
	int		 sg_spill = MAX_FRAGS_SPILL1;
	int		 dir;
	/* initialization */
	*frags = 0;
	*blp = NULL;

	/* Allocate and initialize an array of kernel
	 * structures for the SG elements.
	 */
	i = MAX_SGL_BYTES / 8;
	buflist = kzalloc(i, GFP_USER);
	if (!buflist)
		return NULL;
	buflist_ent = 0;

	/* Allocate a single block of memory to store the sg elements and
	 * the chain buffers.  The calling routine is responsible for
	 * copying the data in this array into the correct place in the
	 * request and chain buffers.
	 */
	sglbuf = pci_alloc_consistent(ioc->pcidev, MAX_SGL_BYTES, sglbuf_dma);
	if (sglbuf == NULL)
		goto free_and_fail;

	if (sgdir & 0x04000000)
		dir = PCI_DMA_TODEVICE;
	else
		dir = PCI_DMA_FROMDEVICE;

	/* At start:
	 *	sgl = sglbuf = point to beginning of sg buffer
	 *	buflist_ent = 0 = first kernel structure
	 *	sg_spill = number of SGE that can be written before the first
	 *		chain element.
	 *
	 */
	sgl = sglbuf;
	sg_spill = ((ioc->req_sz - sge_offset)/(sizeof(dma_addr_t) + sizeof(u32))) - 1;
	while (bytes_allocd < bytes) {
		this_alloc = min(alloc_sz, bytes-bytes_allocd);
		buflist[buflist_ent].len = this_alloc;
		buflist[buflist_ent].kptr = pci_alloc_consistent(ioc->pcidev,
								 this_alloc,
								 &pa);
		if (buflist[buflist_ent].kptr == NULL) {
			alloc_sz = alloc_sz / 2;
			if (alloc_sz == 0) {
				printk(MYIOC_s_WARN_FMT "-SG: No can do - "
				    "not enough memory!   :-(\n", ioc->name);
				printk(MYIOC_s_WARN_FMT "-SG: (freeing %d frags)\n",
					ioc->name, numfrags);
				goto free_and_fail;
			}
			continue;
		} else {
			dma_addr_t dma_addr;

			bytes_allocd += this_alloc;
			sgl->FlagsLength = (0x10000000|MPT_SGE_FLAGS_ADDRESSING|sgdir|this_alloc);
			dma_addr = pci_map_single(ioc->pcidev, buflist[buflist_ent].kptr, this_alloc, dir);
			sgl->Address = dma_addr;

			fragcnt++;
			numfrags++;
			sgl++;
			buflist_ent++;
		}

		if (bytes_allocd >= bytes)
			break;

		/* Need to chain? */
		if (fragcnt == sg_spill) {
			printk(MYIOC_s_WARN_FMT
			    "-SG: No can do - " "Chain required!   :-(\n", ioc->name);
			printk(MYIOC_s_WARN_FMT "(freeing %d frags)\n", ioc->name, numfrags);
			goto free_and_fail;
		}

		/* overflow check... */
		if (numfrags*8 > MAX_SGL_BYTES){
			/* GRRRRR... */
			printk(MYIOC_s_WARN_FMT "-SG: No can do - "
				"too many SG frags!   :-(\n", ioc->name);
			printk(MYIOC_s_WARN_FMT "-SG: (freeing %d frags)\n",
				ioc->name, numfrags);
			goto free_and_fail;
		}
	}

	/* Last sge fixup: set LE+eol+eob bits */
	sgl[-1].FlagsLength |= 0xC1000000;

	*frags = numfrags;
	*blp = buflist;

	dctlprintk(ioc, printk(MYIOC_s_DEBUG_FMT "-SG: kbuf_alloc_2_sgl() - "
	   "%d SG frags generated!\n", ioc->name, numfrags));

	dctlprintk(ioc, printk(MYIOC_s_DEBUG_FMT "-SG: kbuf_alloc_2_sgl() - "
	   "last (big) alloc_sz=%d\n", ioc->name, alloc_sz));

	return sglbuf;

free_and_fail:
	if (sglbuf != NULL) {
		for (i = 0; i < numfrags; i++) {
			dma_addr_t dma_addr;
			u8 *kptr;
			int len;

			if ((sglbuf[i].FlagsLength >> 24) == 0x30)
				continue;

			dma_addr = sglbuf[i].Address;
			kptr = buflist[i].kptr;
			len = buflist[i].len;

			pci_free_consistent(ioc->pcidev, len, kptr, dma_addr);
		}
		pci_free_consistent(ioc->pcidev, MAX_SGL_BYTES, sglbuf, *sglbuf_dma);
	}
	kfree(buflist);
	return NULL;
}

/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
/*
 * Routine to free the SGL elements.
 */
static void
kfree_sgl(MptSge_t *sgl, dma_addr_t sgl_dma, struct buflist *buflist, MPT_ADAPTER *ioc)
{
	MptSge_t	*sg = sgl;
	struct buflist	*bl = buflist;
	u32		 nib;
	int		 dir;
	int		 n = 0;

	if (sg->FlagsLength & 0x04000000)
		dir = PCI_DMA_TODEVICE;
	else
		dir = PCI_DMA_FROMDEVICE;

	nib = (sg->FlagsLength & 0xF0000000) >> 28;
	while (! (nib & 0x4)) { /* eob */
		/* skip ignore/chain. */
		if (nib == 0 || nib == 3) {
			;
		} else if (sg->Address) {
			dma_addr_t dma_addr;
			void *kptr;
			int len;

			dma_addr = sg->Address;
			kptr = bl->kptr;
			len = bl->len;
			pci_unmap_single(ioc->pcidev, dma_addr, len, dir);
			pci_free_consistent(ioc->pcidev, len, kptr, dma_addr);
			n++;
		}
		sg++;
		bl++;
		nib = (le32_to_cpu(sg->FlagsLength) & 0xF0000000) >> 28;
	}

	/* we're at eob! */
	if (sg->Address) {
		dma_addr_t dma_addr;
		void *kptr;
		int len;

		dma_addr = sg->Address;
		kptr = bl->kptr;
		len = bl->len;
		pci_unmap_single(ioc->pcidev, dma_addr, len, dir);
		pci_free_consistent(ioc->pcidev, len, kptr, dma_addr);
		n++;
	}

	pci_free_consistent(ioc->pcidev, MAX_SGL_BYTES, sgl, sgl_dma);
	kfree(buflist);
	dctlprintk(ioc, printk(MYIOC_s_DEBUG_FMT "-SG: Free'd 1 SGL buf + %d kbufs!\n",
	    ioc->name, n));
}

/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
/*
 *	mptctl_getiocinfo - Query the host adapter for IOC information.
 *	@arg: User space argument
 *
 * Outputs:	None.
 * Return:	0 if successful
 *		-EFAULT if data unavailable
 *		-ENODEV  if no such device/adapter
 */
static int
mptctl_getiocinfo (unsigned long arg, unsigned int data_size)
{
	struct mpt_ioctl_iocinfo __user *uarg = (void __user *) arg;
	struct mpt_ioctl_iocinfo *karg;
	MPT_ADAPTER		*ioc;
	struct pci_dev		*pdev;
	int			iocnum;
	unsigned int		port;
	int			cim_rev;
	u8			revision;
	struct scsi_device 	*sdev;
	VirtDevice		*vdevice;

	/* Add of PCI INFO results in unaligned access for
	 * IA64 and Sparc. Reset long to int. Return no PCI
	 * data for obsolete format.
	 */
	if (data_size == sizeof(struct mpt_ioctl_iocinfo_rev0))
		cim_rev = 0;
	else if (data_size == sizeof(struct mpt_ioctl_iocinfo_rev1))
		cim_rev = 1;
	else if (data_size == sizeof(struct mpt_ioctl_iocinfo))
		cim_rev = 2;
	else if (data_size == (sizeof(struct mpt_ioctl_iocinfo_rev0)+12))
		cim_rev = 0;	/* obsolete */
	else
		return -EFAULT;

	karg = kmalloc(data_size, GFP_KERNEL);
	if (karg == NULL) {
		printk(KERN_ERR MYNAM "%s::mpt_ioctl_iocinfo() @%d - no memory available!\n",
				__FILE__, __LINE__);
		return -ENOMEM;
	}

	if (copy_from_user(karg, uarg, data_size)) {
		printk(KERN_ERR MYNAM "%s@%d::mptctl_getiocinfo - "
			"Unable to read in mpt_ioctl_iocinfo struct @ %p\n",
				__FILE__, __LINE__, uarg);
		kfree(karg);
		return -EFAULT;
	}

	if (((iocnum = mpt_verify_adapter(karg->hdr.iocnum, &ioc)) < 0) ||
	    (ioc == NULL)) {
		printk(KERN_DEBUG MYNAM "%s::mptctl_getiocinfo() @%d - ioc%d not found!\n",
				__FILE__, __LINE__, iocnum);
		kfree(karg);
		return -ENODEV;
	}

	/* Verify the data transfer size is correct. */
	if (karg->hdr.maxDataSize != data_size) {
		printk(MYIOC_s_ERR_FMT "%s@%d::mptctl_getiocinfo - "
			"Structure size mismatch. Command not completed.\n",
			ioc->name, __FILE__, __LINE__);
		kfree(karg);
		return -EFAULT;
	}

	dctlprintk(ioc, printk(MYIOC_s_DEBUG_FMT "mptctl_getiocinfo called.\n",
	    ioc->name));

	/* Fill in the data and return the structure to the calling
	 * program
	 */
	if (ioc->bus_type == SAS)
		karg->adapterType = MPT_IOCTL_INTERFACE_SAS;
	else if (ioc->bus_type == FC)
		karg->adapterType = MPT_IOCTL_INTERFACE_FC;
	else
		karg->adapterType = MPT_IOCTL_INTERFACE_SCSI;

	if (karg->hdr.port > 1)
		return -EINVAL;
	port = karg->hdr.port;

	karg->port = port;
	pdev = (struct pci_dev *) ioc->pcidev;

	karg->pciId = pdev->device;
	pci_read_config_byte(pdev, PCI_CLASS_REVISION, &revision);
	karg->hwRev = revision;
	karg->subSystemDevice = pdev->subsystem_device;
	karg->subSystemVendor = pdev->subsystem_vendor;

	if (cim_rev == 1) {
		/* Get the PCI bus, device, and function numbers for the IOC
		 */
		karg->pciInfo.u.bits.busNumber = pdev->bus->number;
		karg->pciInfo.u.bits.deviceNumber = PCI_SLOT( pdev->devfn );
		karg->pciInfo.u.bits.functionNumber = PCI_FUNC( pdev->devfn );
	} else if (cim_rev == 2) {
		/* Get the PCI bus, device, function and segment ID numbers
		   for the IOC */
		karg->pciInfo.u.bits.busNumber = pdev->bus->number;
		karg->pciInfo.u.bits.deviceNumber = PCI_SLOT( pdev->devfn );
		karg->pciInfo.u.bits.functionNumber = PCI_FUNC( pdev->devfn );
		karg->pciInfo.segmentID = pci_domain_nr(pdev->bus);
	}

	/* Get number of devices
         */
	karg->numDevices = 0;
	if (ioc->sh) {
		shost_for_each_device(sdev, ioc->sh) {
			vdevice = sdev->hostdata;
			if (vdevice->vtarget->tflags &
			    MPT_TARGET_FLAGS_RAID_COMPONENT)
				continue;
			karg->numDevices++;
		}
	}

	/* Set the BIOS and FW Version
	 */
	karg->FWVersion = ioc->facts.FWVersion.Word;
	karg->BIOSVersion = ioc->biosVersion;

	/* Set the Version Strings.
	 */
	strncpy (karg->driverVersion, MPT_LINUX_PACKAGE_NAME, MPT_IOCTL_VERSION_LENGTH);
	karg->driverVersion[MPT_IOCTL_VERSION_LENGTH-1]='\0';

	karg->busChangeEvent = 0;
	karg->hostId = ioc->pfacts[port].PortSCSIID;
	karg->rsvd[0] = karg->rsvd[1] = 0;

	/* Copy the data from kernel memory to user memory
	 */
	if (copy_to_user((char __user *)arg, karg, data_size)) {
		printk(MYIOC_s_ERR_FMT "%s@%d::mptctl_getiocinfo - "
			"Unable to write out mpt_ioctl_iocinfo struct @ %p\n",
			ioc->name, __FILE__, __LINE__, uarg);
		kfree(karg);
		return -EFAULT;
	}

	kfree(karg);
	return 0;
}

/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
/*
 *	mptctl_gettargetinfo - Query the host adapter for target information.
 *	@arg: User space argument
 *
 * Outputs:	None.
 * Return:	0 if successful
 *		-EFAULT if data unavailable
 *		-ENODEV  if no such device/adapter
 */
static int
mptctl_gettargetinfo (unsigned long arg)
{
	struct mpt_ioctl_targetinfo __user *uarg = (void __user *) arg;
	struct mpt_ioctl_targetinfo karg;
	MPT_ADAPTER		*ioc;
	VirtDevice		*vdevice;
	char			*pmem;
	int			*pdata;
	int			iocnum;
	int			numDevices = 0;
	int			lun;
	int			maxWordsLeft;
	int			numBytes;
	u8			port;
	struct scsi_device 	*sdev;

	if (copy_from_user(&karg, uarg, sizeof(struct mpt_ioctl_targetinfo))) {
		printk(KERN_ERR MYNAM "%s@%d::mptctl_gettargetinfo - "
			"Unable to read in mpt_ioctl_targetinfo struct @ %p\n",
				__FILE__, __LINE__, uarg);
		return -EFAULT;
	}

	if (((iocnum = mpt_verify_adapter(karg.hdr.iocnum, &ioc)) < 0) ||
	    (ioc == NULL)) {
		printk(KERN_DEBUG MYNAM "%s::mptctl_gettargetinfo() @%d - ioc%d not found!\n",
				__FILE__, __LINE__, iocnum);
		return -ENODEV;
	}

	dctlprintk(ioc, printk(MYIOC_s_DEBUG_FMT "mptctl_gettargetinfo called.\n",
	    ioc->name));
	/* Get the port number and set the maximum number of bytes
	 * in the returned structure.
	 * Ignore the port setting.
	 */
	numBytes = karg.hdr.maxDataSize - sizeof(mpt_ioctl_header);
	maxWordsLeft = numBytes/sizeof(int);
	port = karg.hdr.port;

	if (maxWordsLeft <= 0) {
		printk(MYIOC_s_ERR_FMT "%s@%d::mptctl_gettargetinfo() - no memory available!\n",
			ioc->name, __FILE__, __LINE__);
		return -ENOMEM;
	}

	/* Fill in the data and return the structure to the calling
	 * program
	 */

	/* struct mpt_ioctl_targetinfo does not contain sufficient space
	 * for the target structures so when the IOCTL is called, there is
	 * not sufficient stack space for the structure. Allocate memory,
	 * populate the memory, copy back to the user, then free memory.
	 * targetInfo format:
	 * bits 31-24: reserved
	 *      23-16: LUN
	 *      15- 8: Bus Number
	 *       7- 0: Target ID
	 */
	pmem = kzalloc(numBytes, GFP_KERNEL);