gpu: host1x: Set up device DMA parameters

In order to store device DMA parameters, the DMA framework depends on
the device's dma_parms field to point at a valid memory location. Add
backing storage for this in struct host1x_memory_context and point to
it.

Reported-by: Jonathan Hunter <jonathanh@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240916133320.368620-1-thierry.reding@gmail.com

drivers/gpu/host1x/context.c

@@ -58,6 +58,7 @@ int host1x_memory_context_list_init(struct host1x *host1x)
 		ctx->dev.parent = host1x->dev;
 		ctx->dev.release = host1x_memory_context_release;
 
+		ctx->dev.dma_parms = &ctx->dma_parms;
 		dma_set_max_seg_size(&ctx->dev, UINT_MAX);
 
 		err = device_add(&ctx->dev);

include/linux/host1x.h

@@ -471,6 +471,7 @@ struct host1x_memory_context {
 	refcount_t ref;
 	struct pid *owner;
 
+	struct device_dma_parameters dma_parms;
 	struct device dev;
 	u64 dma_mask;
 	u32 stream_id;