We shouldn't assume CPU physical address we get from page_to_phys()
is same as DMA address we get from dma_alloc_coherent(). On x86_64,
we won't run into any problem with the assumption when dma_ops is
nommu_dma_ops. However, DMA address is IOVA when IOMMU is enabled.
And it's most likely different from CPU physical address when AMD
IOMMU is not in passthrough mode.
This patch fixes page faults when IOMMU is enabled.
Signed-off-by: Vijendar Mukunda <vijendar.mukunda@amd.com>
Link: https://lore.kernel.org/r/1564753899-17124-2-git-send-email-Vijendar.Mukunda@amd.com
Signed-off-by: Mark Brown <broonie@kernel.org>
u16 num_pages;
u16 channels;
u32 xfer_resolution;
u16 num_pages;
u16 channels;
u32 xfer_resolution;
void __iomem *acp3x_base;
};
void __iomem *acp3x_base;
};
static void config_acp3x_dma(struct i2s_stream_instance *rtd, int direction)
{
u16 page_idx;
static void config_acp3x_dma(struct i2s_stream_instance *rtd, int direction)
{
u16 page_idx;
u32 low, high, val, acp_fifo_addr;
u32 low, high, val, acp_fifo_addr;
- struct page *pg = rtd->pg;
+ dma_addr_t addr = rtd->dma_addr;
/* 8 scratch registers used to map one 64 bit address */
if (direction == SNDRV_PCM_STREAM_PLAYBACK)
/* 8 scratch registers used to map one 64 bit address */
if (direction == SNDRV_PCM_STREAM_PLAYBACK)
for (page_idx = 0; page_idx < rtd->num_pages; page_idx++) {
/* Load the low address of page int ACP SRAM through SRBM */
for (page_idx = 0; page_idx < rtd->num_pages; page_idx++) {
/* Load the low address of page int ACP SRAM through SRBM */
- addr = page_to_phys(pg);
low = lower_32_bits(addr);
high = upper_32_bits(addr);
low = lower_32_bits(addr);
high = upper_32_bits(addr);
+ 4);
/* Move to next physically contiguos page */
val += 8;
+ 4);
/* Move to next physically contiguos page */
val += 8;
}
if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
}
if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
struct snd_pcm_runtime *runtime = substream->runtime;
struct i2s_stream_instance *rtd = runtime->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
struct i2s_stream_instance *rtd = runtime->private_data;
return status;
memset(substream->runtime->dma_area, 0, params_buffer_bytes(params));
return status;
memset(substream->runtime->dma_area, 0, params_buffer_bytes(params));
- pg = virt_to_page(substream->dma_buffer.area);
- if (pg) {
- rtd->pg = pg;
+ if (substream->dma_buffer.area) {
+ rtd->dma_addr = substream->dma_buffer.addr;
rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT);
config_acp3x_dma(rtd, substream->stream);
status = 0;
rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT);
config_acp3x_dma(rtd, substream->stream);
status = 0;