Re: [RFC] Initial alpha-0 for new page allocator API

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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@mbligh:~/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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