[PATCH 1/2] drm/vmwgfx: Fix setting of dma masks

[PATCH 1/2] drm/vmwgfx: Fix setting of dma masks

[Thomas Hellstrom]

Previously we set only the dma mask and not the coherent mask. Fix that.
Also, for clarity, make sure both are initially set to 64 bits.

Fixes: 0d00c488f3de: ("drm/vmwgfx: Fix the driver for large dma addresses")
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index 3e2bcff34032..ae9df4432bfc 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -600,13 +600,16 @@ static int vmw_dma_select_mode(struct vmw_private *dev_priv)
 static int vmw_dma_masks(struct vmw_private *dev_priv)
 {
 	struct drm_device *dev = dev_priv->dev;
+	int ret = 0;
 
-	if (intel_iommu_enabled &&
+	ret = dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(64));
+	if (dev_priv->map_mode != vmw_dma_phys &&
 	    (sizeof(unsigned long) == 4 || vmw_restrict_dma_mask)) {
 		DRM_INFO("Restricting DMA addresses to 44 bits.\n");
-		return dma_set_mask(dev->dev, DMA_BIT_MASK(44));
+		return dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(44));
 	}
-	return 0;
+
+	return ret;
 }
 
 static int vmw_driver_load(struct drm_device *dev, unsigned long chipset)
-- 
2.19.0.rc1

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[PATCH v2 2/2] drm/vmwgfx: Improve on IOMMU detection

[Thomas Hellstrom]

instead of relying on intel_iommu_enabled, use the fact that the
dma_map_ops::map_page != dma_direct_map_page.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
---
v2: Merge fixes and typo fix in commit message. Also check for ops being
non-NULL before dereferencing it.
---
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index ae9df4432bfc..7ef5dcb06104 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -26,6 +26,7 @@
  **************************************************************************/
 #include <linux/module.h>
 #include <linux/console.h>
+#include <linux/dma-mapping.h>
 
 #include <drm/drmP.h>
 #include "vmwgfx_drv.h"
@@ -34,7 +35,6 @@
 #include <drm/ttm/ttm_placement.h>
 #include <drm/ttm/ttm_bo_driver.h>
 #include <drm/ttm/ttm_module.h>
-#include <linux/intel-iommu.h>
 
 #define VMWGFX_DRIVER_DESC "Linux drm driver for VMware graphics devices"
 #define VMWGFX_CHIP_SVGAII 0
@@ -545,6 +545,21 @@ static void vmw_get_initial_size(struct vmw_private *dev_priv)
 	dev_priv->initial_height = height;
 }
 
+/**
+ * vmw_assume_iommu - Figure out whether coherent dma-remapping might be
+ * taking place.
+ * @dev: Pointer to the struct drm_device.
+ *
+ * Return: true if iommu present, false otherwise.
+ */
+static bool vmw_assume_iommu(struct drm_device *dev)
+{
+	const struct dma_map_ops *ops = get_dma_ops(dev->dev);
+
+	return !dma_is_direct(ops) && ops &&
+		ops->map_page != dma_direct_map_page;
+}
+
 /**
  * vmw_dma_select_mode - Determine how DMA mappings should be set up for this
  * system.
@@ -568,7 +583,7 @@ static int vmw_dma_select_mode(struct vmw_private *dev_priv)
 
 	if (vmw_force_coherent)
 		dev_priv->map_mode = vmw_dma_alloc_coherent;
-	else if (intel_iommu_enabled)
+	else if (vmw_assume_iommu(dev_priv->dev))
 		dev_priv->map_mode = vmw_dma_map_populate;
 	else if (!vmw_force_iommu)
 		dev_priv->map_mode = vmw_dma_phys;
-- 
2.19.0.rc1

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Re: [PATCH 1/2] drm/vmwgfx: Fix setting of dma masks

[Deepak Singh Rawat]

For the series

Reviewed-by: Deepak Rawat <drawat@vmware.com>

On Tue, 2019-01-29 at 14:35 +0100, Thomas Hellstrom wrote:
> Previously we set only the dma mask and not the coherent mask. Fix
> that.
> Also, for clarity, make sure both are initially set to 64 bits.
> 
> Fixes: 0d00c488f3de: ("drm/vmwgfx: Fix the driver for large dma
> addresses")
> Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
> ---
>  drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> index 3e2bcff34032..ae9df4432bfc 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> @@ -600,13 +600,16 @@ static int vmw_dma_select_mode(struct
> vmw_private *dev_priv)
>  static int vmw_dma_masks(struct vmw_private *dev_priv)
>  {
>  	struct drm_device *dev = dev_priv->dev;
> +	int ret = 0;
>  
> -	if (intel_iommu_enabled &&
> +	ret = dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(64));
> +	if (dev_priv->map_mode != vmw_dma_phys &&
>  	    (sizeof(unsigned long) == 4 || vmw_restrict_dma_mask)) {
>  		DRM_INFO("Restricting DMA addresses to 44 bits.\n");
> -		return dma_set_mask(dev->dev, DMA_BIT_MASK(44));
> +		return dma_set_mask_and_coherent(dev->dev,
> DMA_BIT_MASK(44));
>  	}
> -	return 0;
> +
> +	return ret;
>  }
>  
>  static int vmw_driver_load(struct drm_device *dev, unsigned long
> chipset)

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