Merge branch 'topic/pcm-mmap-cleanup' into for-next

This drags a few post-3.18 mmap fixes, a cleanup of dma_mmap_coherent()
usages and additional fixups for some architectures.

sound/core/pcm_native.c

@@ -35,9 +35,6 @@
 #include <sound/timer.h>
 #include <sound/minors.h>
 #include <asm/io.h>
-#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
-#include <dma-coherence.h>
-#endif
 
 /*
  *  Compatibility
@@ -195,6 +192,21 @@ int snd_pcm_info_user(struct snd_pcm_substream *substream,
 	return err;
 }
 
+static bool hw_support_mmap(struct snd_pcm_substream *substream)
+{
+	if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
+		return false;
+	/* check architectures that return -EINVAL from dma_mmap_coherent() */
+	/* FIXME: this should be some global flag */
+#if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\
+	defined(CONFIG_PARISC) || defined(CONFIG_XTENSA)
+	if (!substream->ops->mmap &&
+	    substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
+		return false;
+#endif
+	return true;
+}
+
 #undef RULES_DEBUG
 
 #ifdef RULES_DEBUG
@@ -372,8 +384,12 @@ int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 	}
 
 	hw = &substream->runtime->hw;
-	if (!params->info)
+	if (!params->info) {
 		params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
+		if (!hw_support_mmap(substream))
+			params->info &= ~(SNDRV_PCM_INFO_MMAP |
+					  SNDRV_PCM_INFO_MMAP_VALID);
+	}
 	if (!params->fifo_size) {
 		m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 		i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
@@ -2072,7 +2088,7 @@ int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
 		mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
 		mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
-	if (hw->info & SNDRV_PCM_INFO_MMAP) {
+	if (hw_support_mmap(substream)) {
 		if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
 			mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
 		if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
@@ -3251,20 +3267,6 @@ static inline struct page *
 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
 {
 	void *vaddr = substream->runtime->dma_area + ofs;
-#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
-	if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
-		return virt_to_page(CAC_ADDR(vaddr));
-#endif
-#if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
-	if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
-		dma_addr_t addr = substream->runtime->dma_addr + ofs;
-		addr -= get_dma_offset(substream->dma_buffer.dev.dev);
-		/* assume dma_handle set via pfn_to_phys() in
-		 * mm/dma-noncoherent.c
-		 */
-		return pfn_to_page(addr >> PAGE_SHIFT);
-	}
-#endif
 	return virt_to_page(vaddr);
 }
 
@@ -3309,13 +3311,6 @@ static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
 	.fault =	snd_pcm_mmap_data_fault,
 };
 
-#ifndef ARCH_HAS_DMA_MMAP_COHERENT
-/* This should be defined / handled globally! */
-#if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
-#define ARCH_HAS_DMA_MMAP_COHERENT
-#endif
-#endif
-
 /*
  * mmap the DMA buffer on RAM
  */
@@ -3331,7 +3326,6 @@ int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
 				area->vm_end - area->vm_start, area->vm_page_prot);
 	}
 #endif /* CONFIG_GENERIC_ALLOCATOR */
-#ifdef ARCH_HAS_DMA_MMAP_COHERENT
 	if (!substream->ops->page &&
 	    substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
 		return dma_mmap_coherent(substream->dma_buffer.dev.dev,
@@ -3339,11 +3333,6 @@ int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
 					 substream->runtime->dma_area,
 					 substream->runtime->dma_addr,
 					 area->vm_end - area->vm_start);
-#elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
-	if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
-	    !plat_device_is_coherent(substream->dma_buffer.dev.dev))
-		area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
-#endif /* ARCH_HAS_DMA_MMAP_COHERENT */
 	/* mmap with fault handler */
 	area->vm_ops = &snd_pcm_vm_ops_data_fault;
 	return 0;