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Message-ID: <1cafba51-b652-5457-0dd7-77d64264c85e@arm.com> Date: Fri, 1 Feb 2019 13:53:09 +0000 From: Robin Murphy <robin.murphy@....com> To: Christoph Hellwig <hch@....de>, John Crispin <john@...ozen.org>, Vinod Koul <vkoul@...nel.org>, Dmitry Tarnyagin <dmitry.tarnyagin@...kless.no>, Nicolas Ferre <nicolas.ferre@...rochip.com>, Sudip Mukherjee <sudipm.mukherjee@...il.com>, Felipe Balbi <balbi@...nel.org>, linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org, netdev@...r.kernel.org, linux-usb@...r.kernel.org, linux-fbdev@...r.kernel.org, alsa-devel@...a-project.org Cc: iommu@...ts.linux-foundation.org Subject: Re: [PATCH 03/18] net: caif: pass struct device to DMA API functions On 01/02/2019 08:47, Christoph Hellwig wrote: > The DMA API generally relies on a struct device to work properly, and > only barely works without one for legacy reasons. Pass the easily > available struct device from the platform_device to remedy this. > > Also use the proper Kconfig symbol to check for DMA API availability. > > Signed-off-by: Christoph Hellwig <hch@....de> > --- > drivers/net/caif/caif_spi.c | 30 ++++++++++++++++-------------- > 1 file changed, 16 insertions(+), 14 deletions(-) > > diff --git a/drivers/net/caif/caif_spi.c b/drivers/net/caif/caif_spi.c > index d28a1398c091..b7f3e263b57c 100644 > --- a/drivers/net/caif/caif_spi.c > +++ b/drivers/net/caif/caif_spi.c > @@ -73,35 +73,37 @@ MODULE_PARM_DESC(spi_down_tail_align, "SPI downlink tail alignment."); > #define LOW_WATER_MARK 100 > #define HIGH_WATER_MARK (LOW_WATER_MARK*5) > > -#ifdef CONFIG_UML > +#ifdef CONFIG_HAS_DMA #ifndef, surely? Robin. > > /* > * We sometimes use UML for debugging, but it cannot handle > * dma_alloc_coherent so we have to wrap it. > */ > -static inline void *dma_alloc(dma_addr_t *daddr) > +static inline void *dma_alloc(struct cfspi *cfspi, dma_addr_t *daddr) > { > return kmalloc(SPI_DMA_BUF_LEN, GFP_KERNEL); > } > > -static inline void dma_free(void *cpu_addr, dma_addr_t handle) > +static inline void dma_free(struct cfspi *cfspi, void *cpu_addr, > + dma_addr_t handle) > { > kfree(cpu_addr); > } > > #else > > -static inline void *dma_alloc(dma_addr_t *daddr) > +static inline void *dma_alloc(struct cfspi *cfspi, dma_addr_t *daddr) > { > - return dma_alloc_coherent(NULL, SPI_DMA_BUF_LEN, daddr, > + return dma_alloc_coherent(&cfspi->pdev->dev, SPI_DMA_BUF_LEN, daddr, > GFP_KERNEL); > } > > -static inline void dma_free(void *cpu_addr, dma_addr_t handle) > +static inline void dma_free(struct cfspi *cfspi, void *cpu_addr, > + dma_addr_t handle) > { > - dma_free_coherent(NULL, SPI_DMA_BUF_LEN, cpu_addr, handle); > + dma_free_coherent(&cfspi->pdev->dev, SPI_DMA_BUF_LEN, cpu_addr, handle); > } > -#endif /* CONFIG_UML */ > +#endif /* CONFIG_HAS_DMA */ > > #ifdef CONFIG_DEBUG_FS > > @@ -610,13 +612,13 @@ static int cfspi_init(struct net_device *dev) > } > > /* Allocate DMA buffers. */ > - cfspi->xfer.va_tx[0] = dma_alloc(&cfspi->xfer.pa_tx[0]); > + cfspi->xfer.va_tx[0] = dma_alloc(cfspi, &cfspi->xfer.pa_tx[0]); > if (!cfspi->xfer.va_tx[0]) { > res = -ENODEV; > goto err_dma_alloc_tx_0; > } > > - cfspi->xfer.va_rx = dma_alloc(&cfspi->xfer.pa_rx); > + cfspi->xfer.va_rx = dma_alloc(cfspi, &cfspi->xfer.pa_rx); > > if (!cfspi->xfer.va_rx) { > res = -ENODEV; > @@ -665,9 +667,9 @@ static int cfspi_init(struct net_device *dev) > return 0; > > err_create_wq: > - dma_free(cfspi->xfer.va_rx, cfspi->xfer.pa_rx); > + dma_free(cfspi, cfspi->xfer.va_rx, cfspi->xfer.pa_rx); > err_dma_alloc_rx: > - dma_free(cfspi->xfer.va_tx[0], cfspi->xfer.pa_tx[0]); > + dma_free(cfspi, cfspi->xfer.va_tx[0], cfspi->xfer.pa_tx[0]); > err_dma_alloc_tx_0: > return res; > } > @@ -683,8 +685,8 @@ static void cfspi_uninit(struct net_device *dev) > > cfspi->ndev = NULL; > /* Free DMA buffers. */ > - dma_free(cfspi->xfer.va_rx, cfspi->xfer.pa_rx); > - dma_free(cfspi->xfer.va_tx[0], cfspi->xfer.pa_tx[0]); > + dma_free(cfspi, cfspi->xfer.va_rx, cfspi->xfer.pa_rx); > + dma_free(cfspi, cfspi->xfer.va_tx[0], cfspi->xfer.pa_tx[0]); > set_bit(SPI_TERMINATE, &cfspi->state); > wake_up_interruptible(&cfspi->wait); > destroy_workqueue(cfspi->wq); >
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