[PATCH v2 0/2] dmaengine: edma/omap-dma: max_burst validity checking

[PATCH v2 0/2] dmaengine: edma/omap-dma: max_burst validity checking

[Peter Ujfalusi]

Hi,

Changes since v1:
- Fixed typo in commit message
- Separated from the 'dmaengine: core/edma/omap-dma: maximum SG len reporting'
  series

Both eDMA and sDMA have limit on the maximum burst size. The two patch
implements protection against too big burst size for both driver.

Regards,
Peter
---
Peter Ujfalusi (2):
  dmaengine: edma: Implement protection for invalid max_burst
  dmaengine: omap-dma: Implement protection for invalid max_burst

 drivers/dma/edma.c     | 5 +++++
 drivers/dma/omap-dma.c | 5 +++++
 2 files changed, 10 insertions(+)

-- 
2.14.2


Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

[PATCH v2 1/2] dmaengine: edma: Implement protection for invalid max_burst

[Peter Ujfalusi]

Set the device's max_burst to 32767 (CIDX is 16bit signed value) so clients
can take this into consideration when setting up the transfer.

During slave transfer preparation check if the requested maxburst is valid.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
---
 drivers/dma/edma.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index a7ea20e7b8e9..9364a3ed345a 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -891,6 +891,10 @@ static int edma_slave_config(struct dma_chan *chan,
 	    cfg->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
 		return -EINVAL;
 
+	if (cfg->src_maxburst > chan->device->max_burst ||
+	    cfg->dst_maxburst > chan->device->max_burst)
+		return -EINVAL;
+
 	memcpy(&echan->cfg, cfg, sizeof(echan->cfg));
 
 	return 0;
@@ -1868,6 +1872,7 @@ static void edma_dma_init(struct edma_cc *ecc, bool legacy_mode)
 	s_ddev->dst_addr_widths = EDMA_DMA_BUSWIDTHS;
 	s_ddev->directions |= (BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV));
 	s_ddev->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
+	s_ddev->max_burst = SZ_32K - 1; /* CIDX: 16bit signed */
 
 	s_ddev->dev = ecc->dev;
 	INIT_LIST_HEAD(&s_ddev->channels);
-- 
2.14.2


Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

[PATCH v2 2/2] dmaengine: omap-dma: Implement protection for invalid max_burst

[Peter Ujfalusi]

Set the device's max_burst to 16777215 (EN is 24bit unsigned value) so
clients can take this into consideration when setting up the transfer.

During slave transfer preparation check if the requested maxburst is valid.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: Russell King <linux@armlinux.org.uk>
---
 drivers/dma/omap-dma.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index 8c1665c8fe33..f6dd849159d8 100644
--- a/drivers/dma/omap-dma.c
+++ b/drivers/dma/omap-dma.c
@@ -1288,6 +1288,10 @@ static int omap_dma_slave_config(struct dma_chan *chan, struct dma_slave_config
 	    cfg->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
 		return -EINVAL;
 
+	if (cfg->src_maxburst > chan->device->max_burst ||
+	    cfg->dst_maxburst > chan->device->max_burst)
+		return -EINVAL;
+
 	memcpy(&c->cfg, cfg, sizeof(c->cfg));
 
 	return 0;
@@ -1482,6 +1486,7 @@ static int omap_dma_probe(struct platform_device *pdev)
 	od->ddev.dst_addr_widths = OMAP_DMA_BUSWIDTHS;
 	od->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
 	od->ddev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
+	od->ddev.max_burst = SZ_16M - 1; /* CCEN: 24bit unsigned */
 	od->ddev.dev = &pdev->dev;
 	INIT_LIST_HEAD(&od->ddev.channels);
 	spin_lock_init(&od->lock);
-- 
2.14.2


Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

Re: [PATCH v2 0/2] dmaengine: edma/omap-dma: max_burst validity checking

[Vinod Koul]

On Tue, Oct 03, 2017 at 11:35:36AM +0300, Peter Ujfalusi wrote:
> Hi,
> 
> Changes since v1:
> - Fixed typo in commit message
> - Separated from the 'dmaengine: core/edma/omap-dma: maximum SG len reporting'
>   series
> 
> Both eDMA and sDMA have limit on the maximum burst size. The two patch
> implements protection against too big burst size for both driver.

I have applied these, but had to hand fix the patches. I guess you should
use gmail or someother server to send patches

-- 
~Vinod