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Date: Fri, 22 Sep 2006 12:24:26 -0700
From: Martin Bligh <mbligh@...igh.org>
To: Andi Kleen <ak@...e.de>
Cc: Christoph Lameter <clameter@....com>, akpm@...gle.com,
linux-kernel@...r.kernel.org,
Christoph Hellwig <hch@...radead.org>,
James Bottomley <James.Bottomley@...eleye.com>,
linux-mm@...ck.org
Subject: Re: [RFC] Initial alpha-0 for new page allocator API
Andi Kleen wrote:
> On Friday 22 September 2006 18:35, Christoph Lameter wrote:
>
>>On Fri, 22 Sep 2006, Andi Kleen wrote:
>>
>>
>>>On Friday 22 September 2006 06:02, Christoph Lameter wrote:
>>>
>>>>We have repeatedly discussed the problems of devices having varying
>>>>address range requirements for doing DMA.
>>>
>>>We already have such an API. dma_alloc_coherent(). Device drivers
>>>are not supposed to mess with GFP_DMA* directly anymore for quite
>>>some time.
>>
>>Device drivers need to be able to indicate ranges of addresses that may be
>>different from ZONE_DMA. This is an attempt to come up with a future
>>scheme that does no longer rely on device drivers referring to zoies.
>
>
> We already have that scheme. Any existing driver should be already converted
> away from GFP_DMA towards dma_*/pci_*. dma_* knows all the magic
> how to get memory for the various ranges. No need to mess up the
> main allocator.
mbligh@...igh:~/linux/views/linux-2.6.18$ grep -r GFP_DMA drivers
drivers/atm/fore200e.c: chunk->alloc_addr =
fore200e_kmalloc(chunk->alloc_size, GFP_KERNEL | GFP_DMA);
drivers/atm/fore200e.c: data = kmalloc(tx_len, GFP_ATOMIC | GFP_DMA);
drivers/atm/fore200e.c: fore200e->stats = fore200e_kmalloc(sizeof(struct
stats), GFP_KERNEL | GFP_DMA);
drivers/atm/fore200e.c: struct prom_data* prom =
fore200e_kmalloc(sizeof(struct prom_data), GFP_KERNEL | GFP_DMA);
drivers/atm/iphase.c: cpcs = kmalloc(sizeof(*cpcs),
GFP_KERNEL|GFP_DMA);
drivers/char/synclink.c: info->intermediate_rxbuffer =
kmalloc(info->max_frame_size, GFP_KERNEL | GFP_DMA);
drivers/isdn/hisax/netjet.c: GFP_KERNEL | GFP_DMA))) {
drivers/isdn/hisax/netjet.c: GFP_KERNEL | GFP_DMA))) {
drivers/media/dvb/dvb-usb/gp8psk.c: buf = kmalloc(512, GFP_KERNEL |
GFP_DMA);
drivers/media/video/arv.c: ar->line_buff = kmalloc(MAX_AR_LINE_BYTES,
GFP_KERNEL | GFP_DMA);
drivers/media/video/planb.c: |GFP_DMA, 0);
drivers/media/video/vino.c: GFP_KERNEL | GFP_DMA);
drivers/media/video/vino.c: get_zeroed_page(GFP_KERNEL | GFP_DMA);
drivers/media/video/vino.c: GFP_KERNEL | GFP_DMA);
drivers/media/video/vino.c: get_zeroed_page(GFP_KERNEL | GFP_DMA);
drivers/media/video/vino.c: vino_drvdata->dummy_page =
get_zeroed_page(GFP_KERNEL | GFP_DMA);
drivers/media/video/vino.c: GFP_KERNEL | GFP_DMA);
drivers/media/video/zr36120_mem.c: mem =
(void*)__get_free_pages(GFP_USER|GFP_DMA,get_order(size));
drivers/mmc/wbsd.c: GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
drivers/net/b44.c: skb = __dev_alloc_skb(RX_PKT_BUF_SZ,GFP_DMA);
drivers/net/b44.c: GFP_ATOMIC|GFP_DMA);
drivers/net/b44.c: insisting on use of GFP_DMA, which is more
restrictive
drivers/net/b44.c: insisting on use of GFP_DMA, which is more
restrictive
drivers/net/gt96100eth.c: ret = (void *)__get_free_pages(GFP_ATOMIC |
GFP_DMA, get_order(size));
drivers/net/hamradio/dmascc.c: info = kmalloc(sizeof(struct scc_info),
GFP_KERNEL | GFP_DMA);
drivers/net/hp100.c: * PCI cards can access the whole PC memory.
Therefore GFP_DMA is not
drivers/net/irda/au1k_ir.c: int gfp = GFP_ATOMIC | GFP_DMA;
drivers/net/irda/pxaficp_ir.c: io->head = kmalloc(size, GFP_KERNEL |
GFP_DMA);
drivers/net/irda/sa1100_ir.c: io->head = kmalloc(size, GFP_KERNEL |
GFP_DMA);
drivers/net/irda/vlsi_ir.c: rd->buf = kmalloc(len, GFP_KERNEL|GFP_DMA);
drivers/net/lance.c: lp = kmalloc(sizeof(*lp), GFP_DMA | GFP_KERNEL);
drivers/net/lance.c: GFP_DMA | GFP_KERNEL);
drivers/net/lance.c: GFP_DMA | GFP_KERNEL);
drivers/net/lance.c: skb = alloc_skb(PKT_BUF_SZ, GFP_DMA | gfp);
drivers/net/lance.c: rx_buff = kmalloc(PKT_BUF_SZ, GFP_DMA | gfp);
drivers/net/macmace.c: mp->rx_ring = (void *)
__get_free_pages(GFP_KERNEL | GFP_DMA, N_RX_PAGES);
drivers/net/macmace.c: mp->tx_ring = (void *)
__get_free_pages(GFP_KERNEL | GFP_DMA, 0);
drivers/net/meth.c: skb = alloc_skb(METH_RX_BUFF_SIZE, GFP_ATOMIC |
GFP_DMA);
drivers/net/ni65.c: ret = skb = alloc_skb(2+16+size,GFP_KERNEL|GFP_DMA);
drivers/net/ni65.c: ret = ptr = kmalloc(T_BUF_SIZE,GFP_KERNEL | GFP_DMA);
drivers/net/tokenring/3c359.c: xl_priv->xl_tx_ring =
kmalloc((sizeof(struct xl_tx_desc) * XL_TX_RING_SIZE) + 7, GFP_DMA |
GFP_KERNEL) ;
drivers/net/tokenring/3c359.c: xl_priv->xl_rx_ring =
kmalloc((sizeof(struct xl_rx_desc) * XL_RX_RING_SIZE) +7, GFP_DMA |
GFP_KERNEL) ;
drivers/net/wan/cosa.c: cosa->bouncebuf = kmalloc(COSA_MTU,
GFP_KERNEL|GFP_DMA);
drivers/net/wan/cosa.c: if ((chan->rxdata = kmalloc(COSA_MTU,
GFP_DMA|GFP_KERNEL)) == NULL) {
drivers/net/wan/cosa.c: if ((kbuf = kmalloc(count, GFP_KERNEL|GFP_DMA))
== NULL) {
drivers/net/wan/z85230.c: c->rx_buf[0]=(void
*)get_zeroed_page(GFP_KERNEL|GFP_DMA);
drivers/net/wan/z85230.c: c->tx_dma_buf[0]=(void
*)get_zeroed_page(GFP_KERNEL|GFP_DMA);
drivers/net/wan/z85230.c: c->tx_dma_buf[0]=(void
*)get_zeroed_page(GFP_KERNEL|GFP_DMA);
drivers/net/znet.c: if (!(znet->rx_start = kmalloc (DMA_BUF_SIZE,
GFP_KERNEL | GFP_DMA)))
drivers/net/znet.c: if (!(znet->tx_start = kmalloc (DMA_BUF_SIZE,
GFP_KERNEL | GFP_DMA)))
drivers/s390/block/dasd.c: device->ccw_mem = (void *)
__get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
drivers/s390/block/dasd.c: device->erp_mem = (void *)
get_zeroed_page(GFP_ATOMIC | GFP_DMA);
drivers/s390/block/dasd.c: GFP_ATOMIC | GFP_DMA);
drivers/s390/block/dasd.c: cqr->data = kzalloc(datasize, GFP_ATOMIC |
GFP_DMA);
drivers/s390/block/dasd_eckd.c: GFP_KERNEL | GFP_DMA);
drivers/s390/char/con3215.c: RAW3215_INBUF_SIZE, GFP_KERNEL|GFP_DMA);
drivers/s390/char/con3215.c: GFP_KERNEL|GFP_DMA);
drivers/s390/char/raw3270.c: rq = kzalloc(sizeof(struct
raw3270_request), GFP_KERNEL | GFP_DMA);
drivers/s390/char/raw3270.c: rq->buffer = kmalloc(size, GFP_KERNEL |
GFP_DMA);
drivers/s390/char/raw3270.c: rp = kmalloc(sizeof(struct raw3270),
GFP_KERNEL | GFP_DMA);
drivers/s390/char/sclp_cpi.c: sccb = (struct cpi_sccb *)
__get_free_page(GFP_KERNEL | GFP_DMA);
drivers/s390/char/sclp_tty.c: page = (void *)
get_zeroed_page(GFP_KERNEL | GFP_DMA);
drivers/s390/char/sclp_vt220.c: page = (void *)
get_zeroed_page(GFP_KERNEL | GFP_DMA);
drivers/s390/char/tape_3590.c: GFP_KERNEL | GFP_DMA);
drivers/s390/char/tape_core.c: device->modeset_byte = kmalloc(1,
GFP_KERNEL | GFP_DMA);
drivers/s390/char/tape_core.c: GFP_ATOMIC | GFP_DMA);
drivers/s390/char/tape_core.c: request->cpdata = kzalloc(datasize,
GFP_KERNEL | GFP_DMA);
drivers/s390/char/tty3270.c: __get_free_pages(GFP_KERNEL|GFP_DMA, 0);
drivers/s390/char/vmcp.c: | __GFP_REPEAT | GFP_DMA,
drivers/s390/cio/chsc.c: page = (void *)get_zeroed_page(GFP_KERNEL |
GFP_DMA);
drivers/s390/cio/chsc.c: secm_area = (void *)get_zeroed_page(GFP_KERNEL
| GFP_DMA);
drivers/s390/cio/chsc.c: css->cub_addr1 = (void
*)get_zeroed_page(GFP_KERNEL | GFP_DMA);
drivers/s390/cio/chsc.c: css->cub_addr2 = (void
*)get_zeroed_page(GFP_KERNEL | GFP_DMA);
drivers/s390/cio/chsc.c: scpd_area = (void *)get_zeroed_page(GFP_KERNEL
| GFP_DMA);
drivers/s390/cio/chsc.c: scmc_area = (void *)get_zeroed_page(GFP_KERNEL
| GFP_DMA);
drivers/s390/cio/chsc.c: sei_page = (void *)get_zeroed_page(GFP_KERNEL |
GFP_DMA);
drivers/s390/cio/chsc.c: sda_area = (void
*)get_zeroed_page(GFP_KERNEL|GFP_DMA);
drivers/s390/cio/chsc.c: scsc_area = (void *)get_zeroed_page(GFP_KERNEL
| GFP_DMA);
drivers/s390/cio/cmf.c: mem = (void*)__get_free_pages(GFP_KERNEL | GFP_DMA,
drivers/s390/cio/css.c: sch = kmalloc (sizeof (*sch), GFP_KERNEL | GFP_DMA);
drivers/s390/cio/device.c: GFP_KERNEL | GFP_DMA);
drivers/s390/cio/device_ops.c: rdc_ccw = kzalloc(sizeof(struct ccw1),
GFP_KERNEL | GFP_DMA);
drivers/s390/cio/device_ops.c: rcd_ccw = kzalloc(sizeof(struct ccw1),
GFP_KERNEL | GFP_DMA);
drivers/s390/cio/device_ops.c: rcd_buf = kzalloc(ciw->count, GFP_KERNEL
| GFP_DMA);
drivers/s390/cio/device_ops.c: buf = kmalloc(32*sizeof(char),
GFP_DMA|GFP_KERNEL);
drivers/s390/cio/device_ops.c: buf2 = kmalloc(32*sizeof(char),
GFP_DMA|GFP_KERNEL);
drivers/s390/cio/qdio.c: irq_ptr = (void *) get_zeroed_page(GFP_KERNEL |
GFP_DMA);
drivers/s390/cio/qdio.c: irq_ptr->qdr=kmalloc(sizeof(struct qdr),
GFP_KERNEL | GFP_DMA);
drivers/s390/cio/qdio.c: return (void *) get_zeroed_page(gfp_mask|GFP_DMA);
drivers/s390/net/claw.c: (void *)__get_free_pages(__GFP_DMA,
drivers/s390/net/claw.c: (void *)__get_free_pages(__GFP_DMA,
drivers/s390/net/claw.c: p_buff=(void
*)__get_free_pages(__GFP_DMA,
drivers/s390/net/claw.c: (void *)__get_free_pages(__GFP_DMA,
drivers/s390/net/claw.c: p_buff = (void
*)__get_free_pages(__GFP_DMA,
drivers/s390/net/ctcmain.c: GFP_ATOMIC | GFP_DMA);
drivers/s390/net/ctcmain.c: GFP_KERNEL | GFP_DMA)) == NULL) {
drivers/s390/net/ctcmain.c: nskb = alloc_skb(skb->len, GFP_ATOMIC |
GFP_DMA);
drivers/s390/net/iucv.c: /* Note: GFP_DMA used used to get memory below
2G */
drivers/s390/net/iucv.c: GFP_KERNEL|GFP_DMA);
drivers/s390/net/iucv.c: GFP_KERNEL|GFP_DMA);
drivers/s390/net/lcs.c: kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
drivers/s390/net/lcs.c: card = kzalloc(sizeof(struct lcs_card),
GFP_KERNEL | GFP_DMA);
drivers/s390/net/lcs.c: * Note: we have allocated the buffer with
GFP_DMA, so
drivers/s390/net/lcs.c: * Note: we have allocated the buffer with
GFP_DMA, so
drivers/s390/net/netiucv.c: NETIUCV_HDRLEN, GFP_ATOMIC | GFP_DMA);
drivers/s390/net/netiucv.c: GFP_KERNEL | GFP_DMA);
drivers/s390/net/netiucv.c: GFP_KERNEL | GFP_DMA);
drivers/s390/net/qeth_main.c: kmalloc(QETH_BUFSIZE, GFP_DMA|GFP_KERNEL);
drivers/s390/net/qeth_main.c: card = kzalloc(sizeof(struct qeth_card),
GFP_DMA|GFP_KERNEL);
drivers/s390/net/qeth_main.c: ptr = (void *)
__get_free_page(GFP_KERNEL|GFP_DMA);
drivers/s390/net/qeth_main.c: GFP_KERNEL|GFP_DMA);
drivers/s390/net/qeth_main.c: GFP_KERNEL|GFP_DMA);
drivers/s390/net/smsgiucv.c: msg = kmalloc(len + 1, GFP_ATOMIC|GFP_DMA);
drivers/scsi/53c7xx.c:/* FIXME: for ISA bus '7xx chips, we need to or
GFP_DMA in here */
drivers/scsi/aacraid/commctrl.c: /* Does this really need to be
GFP_DMA? */
drivers/scsi/aacraid/commctrl.c: p =
kmalloc(usg->sg[i].count,GFP_KERNEL|__GFP_DMA);
drivers/scsi/aha1542.c: SCpnt->host_scribble = (unsigned char *)
kmalloc(512, GFP_KERNEL | GFP_DMA);
drivers/scsi/ch.c: buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
drivers/scsi/ch.c: buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
drivers/scsi/ch.c: buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
drivers/scsi/eata.c: gfp_t gfp_mask = (shost->unchecked_isa_dma ?
GFP_DMA : 0) | GFP_ATOMIC;
drivers/scsi/hosts.c: gfp_mask |= __GFP_DMA;
drivers/scsi/initio.c: if ((tul_scb = (SCB *) kmalloc(i, GFP_ATOMIC |
GFP_DMA)) != NULL)
drivers/scsi/ips.c:/* 4.71.00 - Change all memory allocations to not
use GFP_DMA flag */
drivers/scsi/osst.c: priority |= GFP_DMA;
drivers/scsi/pluto.c: fcs = (struct ctrl_inquiry *) kmalloc (sizeof
(struct ctrl_inquiry) * fcscount, GFP_DMA);
drivers/scsi/scsi.c: .gfp_mask = __GFP_DMA,
drivers/scsi/scsi_error.c: gfp_mask |= __GFP_DMA;
drivers/scsi/scsi_scan.c: ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
drivers/scsi/scsi_scan.c: (sdev->host->unchecked_isa_dma ?
__GFP_DMA : 0));
drivers/scsi/sd.c: buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL | __GFP_DMA);
drivers/scsi/sg.c: * XXX(hch): we shouldn't need GFP_DMA for the actual
S/G list.
drivers/scsi/sg.c: gfp_flags |= GFP_DMA;
drivers/scsi/sg.c: page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP |
__GFP_NOWARN;
drivers/scsi/sr.c: buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
drivers/scsi/sr.c: buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
drivers/scsi/sr_ioctl.c:/* primitive to determine whether we need to
have GFP_DMA set based on
drivers/scsi/sr_ioctl.c:#define SR_GFP_DMA(cd)
(((cd)->device->host->unchecked_isa_dma) ? GFP_DMA : 0)
drivers/scsi/sr_ioctl.c: buffer = kmalloc(32, GFP_KERNEL | SR_GFP_DMA(cd));
drivers/scsi/sr_ioctl.c: buffer = kmalloc(32, GFP_KERNEL | SR_GFP_DMA(cd));
drivers/scsi/sr_ioctl.c: char *buffer = kmalloc(32, GFP_KERNEL |
SR_GFP_DMA(cd));
drivers/scsi/sr_ioctl.c: raw_sector = (unsigned char *) kmalloc(2048,
GFP_KERNEL | SR_GFP_DMA(cd));
drivers/scsi/sr_vendor.c: buffer = (unsigned char *) kmalloc(512,
GFP_KERNEL | GFP_DMA);
drivers/scsi/sr_vendor.c: buffer = (unsigned char *) kmalloc(512,
GFP_KERNEL | GFP_DMA);
drivers/scsi/st.c: priority |= GFP_DMA;
drivers/scsi/u14-34f.c: (sh[j]->unchecked_isa_dma ? GFP_DMA :
0) | GFP_ATOMIC))) {
drivers/usb/gadget/lh7a40x_udc.c: retval = kmalloc(bytes, gfp_flags &
~(__GFP_DMA | __GFP_HIGHMEM));
drivers/usb/gadget/pxa2xx_udc.c: retval = kmalloc (bytes, gfp_flags &
~(__GFP_DMA|__GFP_HIGHMEM));
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