diff mbox series

media: zoran: move to dma-mapping interface

Message ID 20180424204158.2764095-1-arnd@arndb.de
State New
Headers show
Series media: zoran: move to dma-mapping interface | expand

Commit Message

Arnd Bergmann April 24, 2018, 8:40 p.m. UTC 
No drivers should use virt_to_bus() any more. This converts
one of the few remaining ones to the DMA mapping interface.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

---
 drivers/media/pci/zoran/Kconfig        |  2 +-
 drivers/media/pci/zoran/zoran.h        | 10 +++++--
 drivers/media/pci/zoran/zoran_card.c   | 10 +++++--
 drivers/media/pci/zoran/zoran_device.c | 16 +++++-----
 drivers/media/pci/zoran/zoran_driver.c | 54 +++++++++++++++++++++++++---------
 5 files changed, 63 insertions(+), 29 deletions(-)

-- 
2.9.0

Comments

'Christoph Hellwig' April 25, 2018, 7:21 a.m. UTC | #1 
On Wed, Apr 25, 2018 at 09:08:13AM +0200, Arnd Bergmann wrote:
> > That probably also means it can use dma_mmap_coherent instead of the

> > handcrafted remap_pfn_range loop and the PageReserved abuse.

> 

> I'd rather not touch that code. How about adding a comment about

> the fact that it should use dma_mmap_coherent()?


Maybe the real question is if there is anyone that actually cares
for this driver, or if we are better off just removing it?

Same is true for various other virt_to_bus using drivers, e.g. the
grotty atm drivers.
Arnd Bergmann April 25, 2018, 11:15 a.m. UTC | #2 
On Wed, Apr 25, 2018 at 9:21 AM, Christoph Hellwig <hch@infradead.org> wrote:
> On Wed, Apr 25, 2018 at 09:08:13AM +0200, Arnd Bergmann wrote:

>> > That probably also means it can use dma_mmap_coherent instead of the

>> > handcrafted remap_pfn_range loop and the PageReserved abuse.

>>

>> I'd rather not touch that code. How about adding a comment about

>> the fact that it should use dma_mmap_coherent()?

>

> Maybe the real question is if there is anyone that actually cares

> for this driver, or if we are better off just removing it?

>

> Same is true for various other virt_to_bus using drivers, e.g. the

> grotty atm drivers.


That thought had occurred to me as well. I removed the oldest ISDN
drivers already some years ago, and the OSS sound drivers
got removed as well, and comedi got converted to the dma-mapping
interfaces, so there isn't much left at all now. This is what we
have as of v4.17-rc1:

$ git grep -wl '\<bus_to_virt\|virt_to_bus\>' drivers/
drivers/atm/ambassador.c
drivers/atm/firestream.c
drivers/atm/horizon.c
drivers/atm/zatm.c
drivers/block/swim3.c # power mac specific
drivers/gpu/drm/mga/mga_dma.c # commented out
drivers/infiniband/hw/nes/nes_verbs.c # commented out
drivers/isdn/hisax/netjet.c
drivers/net/appletalk/ltpc.c
drivers/net/ethernet/amd/au1000_eth.c # mips specific
drivers/net/ethernet/amd/ni65.c # only in comment
drivers/net/ethernet/apple/bmac.c # power mac specific
drivers/net/ethernet/apple/mace.c # power mac specific
drivers/net/ethernet/dec/tulip/de4x5.c  # trivially fixable
drivers/net/ethernet/i825xx/82596.c # m68k specific
drivers/net/ethernet/i825xx/lasi_82596.c # parisc specific
drivers/net/ethernet/i825xx/lib82596.c # only in comment
drivers/net/ethernet/sgi/ioc3-eth.c # mips specific
drivers/net/wan/cosa.c
drivers/net/wan/lmc/lmc_main.c
drivers/net/wan/z85230.c
drivers/scsi/3w-xxxx.c # only in comment
drivers/scsi/BusLogic.c
drivers/scsi/a2091.c # m68k specific
drivers/scsi/a3000.c # m68k specific
drivers/scsi/dc395x.c # only in comment
drivers/scsi/dpt_i2o.c
drivers/scsi/gvp11.c # m68k specific
drivers/scsi/mvme147.c # m68k specific
drivers/scsi/qla1280.c # comment only
drivers/staging/netlogic/xlr_net.c # mips specific
drivers/tty/serial/cpm_uart/cpm_uart_cpm2.c # ppc32 specific
drivers/vme/bridges/vme_ca91cx42.c

My feeling is that we want to keep most of the arch specific
ones, in particular removing the m68k drivers would break
a whole class of machines.

For the ones that don't have a comment on them, they
probably won't be missed much, but it's hard to know for
sure. What we do know is that they never worked on
x86_64, and most of them are for ISA cards.

        Arnd
'Christoph Hellwig' April 25, 2018, 3:26 p.m. UTC | #3 
On Wed, Apr 25, 2018 at 01:15:18PM +0200, Arnd Bergmann wrote:
> That thought had occurred to me as well. I removed the oldest ISDN

> drivers already some years ago, and the OSS sound drivers

> got removed as well, and comedi got converted to the dma-mapping

> interfaces, so there isn't much left at all now. This is what we

> have as of v4.17-rc1:


Yes, I've been looking at various grotty old bits to purge.  Usually
I've been looking for some non-tree wide patches and CCed the last
active people to see if they care.  In a few cases people do, but
most often no one does.

> My feeling is that we want to keep most of the arch specific

> ones, in particular removing the m68k drivers would break

> a whole class of machines.


For the arch specific ones it would good to just ping the relevant
maintainers.  Especially m68k and parisc folks seems to be very
responsive.
Arnd Bergmann April 25, 2018, 3:58 p.m. UTC | #4 
On Wed, Apr 25, 2018 at 5:26 PM, Christoph Hellwig <hch@infradead.org> wrote:
> On Wed, Apr 25, 2018 at 01:15:18PM +0200, Arnd Bergmann wrote:

>> That thought had occurred to me as well. I removed the oldest ISDN

>> drivers already some years ago, and the OSS sound drivers

>> got removed as well, and comedi got converted to the dma-mapping

>> interfaces, so there isn't much left at all now. This is what we

>> have as of v4.17-rc1:

>

> Yes, I've been looking at various grotty old bits to purge.  Usually

> I've been looking for some non-tree wide patches and CCed the last

> active people to see if they care.  In a few cases people do, but

> most often no one does.


Let's start with this one (zoran) then, as Mauro is keen on having
all media drivers compile-testable on x86-64 and arm.

Trent Piepho and Hans Verkuil both worked on this driver in the
2008/2009 timeframe and those were the last commits from anyone
who appears to have tested their patches on actual hardware.

Trent, Hans: do you have reason to believe that there might still
be users out there?

       Arnd
Bernhard Praschinger April 25, 2018, 5:27 p.m. UTC | #5 
Hallo

Christoph Hellwig wrote:
> On Wed, Apr 25, 2018 at 09:08:13AM +0200, Arnd Bergmann wrote:

>>> That probably also means it can use dma_mmap_coherent instead of the

>>> handcrafted remap_pfn_range loop and the PageReserved abuse.

>>

>> I'd rather not touch that code. How about adding a comment about

>> the fact that it should use dma_mmap_coherent()?

>

> Maybe the real question is if there is anyone that actually cares

> for this driver, or if we are better off just removing it?

>

> Same is true for various other virt_to_bus using drivers, e.g. the

> grotty atm drivers.


I would appreciate if somebody would removes the driver from the linux 
kernel. I suggested that some years ago 2014-06-23 (just scroll down):
https://sourceforge.net/p/mjpeg/mailman/mjpeg-users/?viewmonth=201406

You should also find that thread in the kernel-janitors@vger.kernel.org 
and linux-media@vger.kernel.org Mailinglist archive.

I know of one person that is still using this old type of card's but he 
uses a 2.6.x Kernel on a old machine, using old software releases.
https://sourceforge.net/p/mjpeg/mailman/mjpeg-users/?viewmonth=201709

That type of card were introduced about ~20 years ago. I think it is a 
good moment to say goodbye to that type of cards.

auf hoffentlich bald,

Berni the Chaos of Woodquarter

Email: shadowlord@utanet.at
www: http://www.lysator.liu.se/~gz/bernhard
Arnd Bergmann May 7, 2018, 9:17 p.m. UTC | #6 
On Mon, May 7, 2018 at 5:05 AM, Hans Verkuil <hverkuil@xs4all.nl> wrote:
> On 25/04/18 19:22, Mauro Carvalho Chehab wrote:

>> Em Wed, 25 Apr 2018 17:58:25 +0200

>> Arnd Bergmann <arnd@arndb.de> escreveu:

>>

>>> On Wed, Apr 25, 2018 at 5:26 PM, Christoph Hellwig <hch@infradead.org> wrote:

>>>> On Wed, Apr 25, 2018 at 01:15:18PM +0200, Arnd Bergmann wrote:

>>>>> That thought had occurred to me as well. I removed the oldest ISDN

>>>>> drivers already some years ago, and the OSS sound drivers

>>>>> got removed as well, and comedi got converted to the dma-mapping

>>>>> interfaces, so there isn't much left at all now. This is what we

>>>>> have as of v4.17-rc1:

>>>>

>>>> Yes, I've been looking at various grotty old bits to purge.  Usually

>>>> I've been looking for some non-tree wide patches and CCed the last

>>>> active people to see if they care.  In a few cases people do, but

>>>> most often no one does.

>>>

>>> Let's start with this one (zoran) then, as Mauro is keen on having

>>> all media drivers compile-testable on x86-64 and arm.

>>>

>>> Trent Piepho and Hans Verkuil both worked on this driver in the

>>> 2008/2009 timeframe and those were the last commits from anyone

>>> who appears to have tested their patches on actual hardware.

>>

>> Zoran is a driver for old hardware. I don't doubt that are people

>> out there still using it, but who knows?

>>

>> I have a few those boards packed somewhere. I haven't work with PCI

>> hardware for a while. If needed, I can try to seek for them and

>> do some tests. I need first to unpack a machine with PCI slots...

>> the NUCs I generally use for development don't have any :-)

>>

>> Anyway, except for virt_to_bus() and related stuff, I think that this

>> driver is in good shape, as Hans did a lot of work in the past to

>> make it to use the current media framework.

>>

>>>

>>> Trent, Hans: do you have reason to believe that there might still

>>> be users out there?

>

> I have no way of knowing this. However, I think they are easily replaced

> by much cheaper USB alternatives today.

>

> I did some work on the zoran driver several years ago, but it doesn't use

> the vb2 framework (and not even the older vb1 framework!) so I'm sure there

> are all sorts of bugs in that driver.

>

> Personally I would be fine with moving this driver to staging and removing

> it by, say, the end of the year.

>

> Nobody is going to work on it and I think it is time to retire it.


Based on the link to the old discussed that Bernhard provided, it
seems that the driver was already in a barely usable state 5 years
ago (the remaining users decided to use an even older 2.6 kernel instead),
and nobody has worked on fixing it since, so moving it to staging or
immediately removing it would both seem appropriate.

        Arnd
diff mbox series

Patch

diff --git a/drivers/media/pci/zoran/Kconfig b/drivers/media/pci/zoran/Kconfig
index 39ec35bd21a5..26f40e124a32 100644
--- a/drivers/media/pci/zoran/Kconfig
+++ b/drivers/media/pci/zoran/Kconfig
@@ -1,6 +1,6 @@ 
 config VIDEO_ZORAN
 	tristate "Zoran ZR36057/36067 Video For Linux"
-	depends on PCI && I2C_ALGOBIT && VIDEO_V4L2 && VIRT_TO_BUS
+	depends on PCI && I2C_ALGOBIT && VIDEO_V4L2
 	depends on !ALPHA
 	help
 	  Say Y for support for MJPEG capture cards based on the Zoran
diff --git a/drivers/media/pci/zoran/zoran.h b/drivers/media/pci/zoran/zoran.h
index 9bb3c21aa275..9ff3a9acb60a 100644
--- a/drivers/media/pci/zoran/zoran.h
+++ b/drivers/media/pci/zoran/zoran.h
@@ -183,13 +183,14 @@  struct zoran_buffer {
 	struct zoran_sync bs;		/* DONE: info to return to application */
 	union {
 		struct {
-			__le32 *frag_tab;	/* addresses of frag table */
-			u32 frag_tab_bus;	/* same value cached to save time in ISR */
+			__le32 *frag_tab;	/* DMA addresses of frag table */
+			void **frag_virt_tab;	/* virtual addresses of frag table */
+			dma_addr_t frag_tab_dma;/* same value cached to save time in ISR */
 		} jpg;
 		struct {
 			char *fbuffer;		/* virtual address of frame buffer */
 			unsigned long fbuffer_phys;/* physical address of frame buffer */
-			unsigned long fbuffer_bus;/* bus address of frame buffer */
+			dma_addr_t fbuffer_dma;/* bus address of frame buffer */
 		} v4l;
 	};
 };
@@ -221,6 +222,7 @@  struct zoran_fh {
 
 	struct zoran_overlay_settings overlay_settings;
 	u32 *overlay_mask;			/* overlay mask */
+	dma_addr_t overlay_mask_dma;
 	enum zoran_lock_activity overlay_active;/* feature currently in use? */
 
 	struct zoran_buffer_col buffers;	/* buffers' info */
@@ -307,6 +309,7 @@  struct zoran {
 
 	struct zoran_overlay_settings overlay_settings;
 	u32 *overlay_mask;	/* overlay mask */
+	dma_addr_t overlay_mask_dma;
 	enum zoran_lock_activity overlay_active;	/* feature currently in use? */
 
 	wait_queue_head_t v4l_capq;
@@ -346,6 +349,7 @@  struct zoran {
 
 	/* zr36057's code buffer table */
 	__le32 *stat_com;		/* stat_com[i] is indexed by dma_head/tail & BUZ_MASK_STAT_COM */
+	dma_addr_t stat_com_dma;
 
 	/* (value & BUZ_MASK_FRAME) corresponds to index in pend[] queue */
 	int jpg_pend[BUZ_MAX_FRAME];
diff --git a/drivers/media/pci/zoran/zoran_card.c b/drivers/media/pci/zoran/zoran_card.c
index a6b9ebd20263..dabd8bf77472 100644
--- a/drivers/media/pci/zoran/zoran_card.c
+++ b/drivers/media/pci/zoran/zoran_card.c
@@ -890,6 +890,7 @@  zoran_open_init_params (struct zoran *zr)
 	/* User must explicitly set a window */
 	zr->overlay_settings.is_set = 0;
 	zr->overlay_mask = NULL;
+	zr->overlay_mask_dma = 0;
 	zr->overlay_active = ZORAN_FREE;
 
 	zr->v4l_memgrab_active = 0;
@@ -1028,7 +1029,8 @@  static int zr36057_init (struct zoran *zr)
 
 	/* allocate memory *before* doing anything to the hardware
 	 * in case allocation fails */
-	zr->stat_com = kzalloc(BUZ_NUM_STAT_COM * 4, GFP_KERNEL);
+	zr->stat_com = dma_alloc_coherent(&zr->pci_dev->dev,
+				BUZ_NUM_STAT_COM * 4, &zr->stat_com_dma, GFP_KERNEL);
 	zr->video_dev = video_device_alloc();
 	if (!zr->stat_com || !zr->video_dev) {
 		dprintk(1,
@@ -1072,7 +1074,8 @@  static int zr36057_init (struct zoran *zr)
 	return 0;
 
 exit_free:
-	kfree(zr->stat_com);
+	dma_free_coherent(&zr->pci_dev->dev, BUZ_NUM_STAT_COM * 4,
+			  zr->stat_com, zr->stat_com_dma);
 	kfree(zr->video_dev);
 	return err;
 }
@@ -1107,7 +1110,8 @@  static void zoran_remove(struct pci_dev *pdev)
 	btwrite(0, ZR36057_SPGPPCR);
 	free_irq(zr->pci_dev->irq, zr);
 	/* unmap and free memory */
-	kfree(zr->stat_com);
+	dma_free_coherent(&zr->pci_dev->dev, BUZ_NUM_STAT_COM * 4,
+			  zr->stat_com, zr->stat_com_dma);
 	zoran_proc_cleanup(zr);
 	iounmap(zr->zr36057_mem);
 	pci_disable_device(zr->pci_dev);
diff --git a/drivers/media/pci/zoran/zoran_device.c b/drivers/media/pci/zoran/zoran_device.c
index 40adceebca7e..1ac7810ddd25 100644
--- a/drivers/media/pci/zoran/zoran_device.c
+++ b/drivers/media/pci/zoran/zoran_device.c
@@ -430,9 +430,9 @@  zr36057_set_vfe (struct zoran              *zr,
 		 * zr->overlay_settings.width instead of video_width */
 
 		mask_line_size = (BUZ_MAX_WIDTH + 31) / 32;
-		reg = virt_to_bus(zr->overlay_mask);
+		reg = zr->overlay_mask_dma;
 		btwrite(reg, ZR36057_MMTR);
-		reg = virt_to_bus(zr->overlay_mask + mask_line_size);
+		reg = zr->overlay_mask_dma + mask_line_size;
 		btwrite(reg, ZR36057_MMBR);
 		reg =
 		    mask_line_size - (zr->overlay_settings.width +
@@ -775,7 +775,7 @@  zr36057_set_jpg (struct zoran          *zr,
 	//btor(ZR36057_VFESPFR_VCLKPol, ZR36057_VFESPFR);
 
 	/* code base address */
-	reg = virt_to_bus(zr->stat_com);
+	reg = zr->stat_com_dma;
 	btwrite(reg, ZR36057_JCBA);
 
 	/* FIFO threshold (FIFO is 160. double words) */
@@ -1097,7 +1097,7 @@  zoran_feed_stat_com (struct zoran *zr)
 			if (!(zr->stat_com[i] & cpu_to_le32(1)))
 				break;
 			zr->stat_com[i] =
-			    cpu_to_le32(zr->jpg_buffers.buffer[frame].jpg.frag_tab_bus);
+			    cpu_to_le32(zr->jpg_buffers.buffer[frame].jpg.frag_tab_dma);
 		} else {
 			/* fill 2 stat_com entries */
 			i = ((zr->jpg_dma_head -
@@ -1105,9 +1105,9 @@  zoran_feed_stat_com (struct zoran *zr)
 			if (!(zr->stat_com[i] & cpu_to_le32(1)))
 				break;
 			zr->stat_com[i] =
-			    cpu_to_le32(zr->jpg_buffers.buffer[frame].jpg.frag_tab_bus);
+			    cpu_to_le32(zr->jpg_buffers.buffer[frame].jpg.frag_tab_dma);
 			zr->stat_com[i + 1] =
-			    cpu_to_le32(zr->jpg_buffers.buffer[frame].jpg.frag_tab_bus);
+			    cpu_to_le32(zr->jpg_buffers.buffer[frame].jpg.frag_tab_dma);
 		}
 		zr->jpg_buffers.buffer[frame].state = BUZ_STATE_DMA;
 		zr->jpg_dma_head++;
@@ -1272,7 +1272,7 @@  error_handler (struct zoran *zr,
 		printk(KERN_INFO "stat_com frames:");
 		for (j = 0; j < BUZ_NUM_STAT_COM; j++) {
 			for (i = 0; i < zr->jpg_buffers.num_buffers; i++) {
-				if (le32_to_cpu(zr->stat_com[j]) == zr->jpg_buffers.buffer[i].jpg.frag_tab_bus)
+				if (le32_to_cpu(zr->stat_com[j]) == zr->jpg_buffers.buffer[i].jpg.frag_tab_dma)
 					printk(KERN_CONT "% d->%d", j, i);
 			}
 		}
@@ -1411,7 +1411,7 @@  zoran_irq (int             irq,
 
 					/* Buffer address */
 
-					reg = zr->v4l_buffers.buffer[frame].v4l.fbuffer_bus;
+					reg = zr->v4l_buffers.buffer[frame].v4l.fbuffer_dma;
 					btwrite(reg, ZR36057_VDTR);
 					if (zr->v4l_settings.height > BUZ_MAX_HEIGHT / 2)
 						reg += zr->v4l_settings.bytesperline;
diff --git a/drivers/media/pci/zoran/zoran_driver.c b/drivers/media/pci/zoran/zoran_driver.c
index 4b6466961b41..dad1fb02ced2 100644
--- a/drivers/media/pci/zoran/zoran_driver.c
+++ b/drivers/media/pci/zoran/zoran_driver.c
@@ -235,15 +235,20 @@  static int v4l_fbuffer_alloc(struct zoran_fh *fh)
 		}
 		fh->buffers.buffer[i].v4l.fbuffer = mem;
 		fh->buffers.buffer[i].v4l.fbuffer_phys = virt_to_phys(mem);
-		fh->buffers.buffer[i].v4l.fbuffer_bus = virt_to_bus(mem);
+		fh->buffers.buffer[i].v4l.fbuffer_dma =
+			dma_map_single(&zr->pci_dev->dev, mem,
+				       fh->buffers.buffer_size,
+				       DMA_FROM_DEVICE);
+		if (!fh->buffers.buffer[i].v4l.fbuffer_dma)
+			return -ENXIO;
 		for (off = 0; off < fh->buffers.buffer_size;
 		     off += PAGE_SIZE)
 			SetPageReserved(virt_to_page(mem + off));
 		dprintk(4,
 			KERN_INFO
-			"%s: %s - V4L frame %d mem %p (bus: 0x%llx)\n",
+			"%s: %s - V4L frame %d mem %p (bus: %pad)\n",
 			ZR_DEVNAME(zr), __func__, i, mem,
-			(unsigned long long)virt_to_bus(mem));
+			&fh->buffers.buffer[i].v4l.fbuffer_dma);
 	}
 
 	fh->buffers.allocated = 1;
@@ -308,6 +313,7 @@  static int jpg_fbuffer_alloc(struct zoran_fh *fh)
 	struct zoran *zr = fh->zr;
 	int i, j, off;
 	u8 *mem;
+	void **virt_tab;
 
 	for (i = 0; i < fh->buffers.num_buffers; i++) {
 		if (fh->buffers.buffer[i].jpg.frag_tab)
@@ -319,16 +325,19 @@  static int jpg_fbuffer_alloc(struct zoran_fh *fh)
 		/* Allocate fragment table for this buffer */
 
 		mem = (void *)get_zeroed_page(GFP_KERNEL);
-		if (!mem) {
+		virt_tab = (void *)get_zeroed_page(GFP_KERNEL);
+		if (!mem || !virt_tab) {
 			dprintk(1,
 				KERN_ERR
 				"%s: %s - get_zeroed_page (frag_tab) failed for buffer %d\n",
 				ZR_DEVNAME(zr), __func__, i);
+			kfree(mem);
+			kfree(virt_tab);
 			jpg_fbuffer_free(fh);
 			return -ENOBUFS;
 		}
 		fh->buffers.buffer[i].jpg.frag_tab = (__le32 *)mem;
-		fh->buffers.buffer[i].jpg.frag_tab_bus = virt_to_bus(mem);
+		fh->buffers.buffer[i].jpg.frag_virt_tab = virt_tab;
 
 		if (fh->buffers.need_contiguous) {
 			mem = kmalloc(fh->buffers.buffer_size, GFP_KERNEL);
@@ -340,8 +349,9 @@  static int jpg_fbuffer_alloc(struct zoran_fh *fh)
 				jpg_fbuffer_free(fh);
 				return -ENOBUFS;
 			}
+			fh->buffers.buffer[i].jpg.frag_virt_tab[0] = mem;
 			fh->buffers.buffer[i].jpg.frag_tab[0] =
-				cpu_to_le32(virt_to_bus(mem));
+				cpu_to_le32(dma_map_single(&zr->pci_dev->dev, mem, fh->buffers.buffer_size, DMA_FROM_DEVICE));
 			fh->buffers.buffer[i].jpg.frag_tab[1] =
 				cpu_to_le32((fh->buffers.buffer_size >> 1) | 1);
 			for (off = 0; off < fh->buffers.buffer_size; off += PAGE_SIZE)
@@ -359,8 +369,9 @@  static int jpg_fbuffer_alloc(struct zoran_fh *fh)
 					return -ENOBUFS;
 				}
 
+				fh->buffers.buffer[i].jpg.frag_virt_tab[j] = mem;
 				fh->buffers.buffer[i].jpg.frag_tab[2 * j] =
-					cpu_to_le32(virt_to_bus(mem));
+					cpu_to_le32(dma_map_single(&zr->pci_dev->dev, mem, fh->buffers.buffer_size, DMA_FROM_DEVICE));
 				fh->buffers.buffer[i].jpg.frag_tab[2 * j + 1] =
 					cpu_to_le32((PAGE_SIZE >> 2) << 1);
 				SetPageReserved(virt_to_page(mem));
@@ -368,6 +379,8 @@  static int jpg_fbuffer_alloc(struct zoran_fh *fh)
 
 			fh->buffers.buffer[i].jpg.frag_tab[2 * j - 1] |= cpu_to_le32(1);
 		}
+
+		fh->buffers.buffer[i].jpg.frag_tab_dma = dma_map_single(&zr->pci_dev->dev, mem, PAGE_SIZE, DMA_TO_DEVICE);
 	}
 
 	dprintk(4,
@@ -400,9 +413,10 @@  static void jpg_fbuffer_free(struct zoran_fh *fh)
 			frag_tab = buffer->jpg.frag_tab[0];
 
 			if (frag_tab) {
-				mem = bus_to_virt(le32_to_cpu(frag_tab));
+				mem = buffer->jpg.frag_virt_tab[0];
 				for (off = 0; off < fh->buffers.buffer_size; off += PAGE_SIZE)
 					ClearPageReserved(virt_to_page(mem + off));
+				dma_unmap_single(&zr->pci_dev->dev, frag_tab, PAGE_SIZE, DMA_FROM_DEVICE);
 				kfree(mem);
 				buffer->jpg.frag_tab[0] = 0;
 				buffer->jpg.frag_tab[1] = 0;
@@ -413,14 +427,19 @@  static void jpg_fbuffer_free(struct zoran_fh *fh)
 
 				if (!frag_tab)
 					break;
-				ClearPageReserved(virt_to_page(bus_to_virt(le32_to_cpu(frag_tab))));
-				free_page((unsigned long)bus_to_virt(le32_to_cpu(frag_tab)));
+				ClearPageReserved(virt_to_page(buffer->jpg.frag_virt_tab[j]));
+				dma_unmap_single(&zr->pci_dev->dev, le32_to_cpu(frag_tab), PAGE_SIZE, DMA_FROM_DEVICE);
+				free_page((unsigned long)buffer->jpg.frag_virt_tab[j]);
+				buffer->jpg.frag_virt_tab[j] = NULL;
 				buffer->jpg.frag_tab[2 * j] = 0;
 				buffer->jpg.frag_tab[2 * j + 1] = 0;
 			}
 		}
 
+		dma_unmap_single(&zr->pci_dev->dev, buffer->jpg.frag_tab_dma, PAGE_SIZE, DMA_TO_DEVICE);
 		free_page((unsigned long)buffer->jpg.frag_tab);
+		free_page((unsigned long)buffer->jpg.frag_virt_tab);
+		buffer->jpg.frag_virt_tab = NULL;
 		buffer->jpg.frag_tab = NULL;
 	}
 
@@ -873,6 +892,7 @@  static void zoran_close_end_session(struct zoran_fh *fh)
 		if (!zr->v4l_memgrab_active)
 			zr36057_overlay(zr, 0);
 		zr->overlay_mask = NULL;
+		zr->overlay_mask_dma = 0;
 	}
 
 	if (fh->map_mode == ZORAN_MAP_MODE_RAW) {
@@ -940,8 +960,10 @@  static int zoran_open(struct file *file)
 
 	/* used to be BUZ_MAX_WIDTH/HEIGHT, but that gives overflows
 	 * on norm-change! */
-	fh->overlay_mask =
-	    kmalloc(((768 + 31) / 32) * 576 * 4, GFP_KERNEL);
+	fh->overlay_mask = dma_alloc_wc(&zr->pci_dev->dev,
+					((768 + 31) / 32) * 576 * 4,
+					&fh->overlay_mask_dma,
+					GFP_KERNEL);
 	if (!fh->overlay_mask) {
 		dprintk(1,
 			KERN_ERR
@@ -1016,6 +1038,7 @@  zoran_close(struct file  *file)
 		zr->v4l_overlay_active = 0;
 		zr36057_overlay(zr, 0);
 		zr->overlay_mask = NULL;
+		zr->overlay_mask_dma = 0;
 
 		/* capture off */
 		wake_up_interruptible(&zr->v4l_capq);
@@ -1033,7 +1056,8 @@  zoran_close(struct file  *file)
 
 	v4l2_fh_del(&fh->fh);
 	v4l2_fh_exit(&fh->fh);
-	kfree(fh->overlay_mask);
+	dma_free_wc(&zr->pci_dev->dev, ((768 + 31) / 32) * 576 * 4,
+		    fh->overlay_mask, fh->overlay_mask_dma);
 	kfree(fh);
 
 	dprintk(4, KERN_INFO "%s: %s done\n", ZR_DEVNAME(zr), __func__);
@@ -1284,6 +1308,7 @@  static int setup_overlay(struct zoran_fh *fh, int on)
 		if (!zr->v4l_memgrab_active)
 			zr36057_overlay(zr, 0);
 		zr->overlay_mask = NULL;
+		zr->overlay_mask_dma = 0;
 	} else {
 		if (!zr->vbuf_base || !fh->overlay_settings.is_set) {
 			dprintk(1,
@@ -1302,6 +1327,7 @@  static int setup_overlay(struct zoran_fh *fh, int on)
 		zr->overlay_active = fh->overlay_active = ZORAN_LOCKED;
 		zr->v4l_overlay_active = 1;
 		zr->overlay_mask = fh->overlay_mask;
+		zr->overlay_mask_dma = fh->overlay_mask_dma;
 		zr->overlay_settings = fh->overlay_settings;
 		if (!zr->v4l_memgrab_active)
 			zr36057_overlay(zr, 1);
@@ -2763,7 +2789,7 @@  zoran_mmap (struct file           *file,
 				    le32_to_cpu(fh->buffers.
 				    buffer[i].jpg.frag_tab[2 * j]);
 				/* should just be pos on i386 */
-				page = virt_to_phys(bus_to_virt(pos))
+				page = virt_to_phys(fh->buffers.buffer[i].jpg.frag_virt_tab[j])
 								>> PAGE_SHIFT;
 				if (remap_pfn_range(vma, start, page,
 							todo, PAGE_SHARED)) {