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sound: usb: Flush cache explicitly after mapping buffers

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For USB Audio accelerated path it is must to explicitly flush cache
before giving mapped event ring, transfer ring and data buffer to
ADSP firmware as allocated memory is cacheable whereas ADSP
subsystem doesn't use cacheable memory. This helps to have coherent
memory seen from ADSP firmware.

Change-Id: I9aff88cdba18acb1cc181beee16e9db2ec167b88
Signed-off-by: Mayank Rana <mrana@codeaurora.org>
This commit is contained in:
Mayank Rana 2020-03-18 14:11:16 -07:00
commit a07204a774
1 changed files with 12 additions and 4 deletions
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16
sound/usb/usb_audio_qmi_svc.c
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@ -297,6 +297,7 @@ static unsigned long uaudio_iommu_map(enum mem_type mtype, phys_addr_t pa,
size_t sg_len, total_len = 0;
struct scatterlist *sg;
phys_addr_t pa_sg;
int prot = IOMMU_READ | IOMMU_WRITE;
switch (mtype) {
case MEM_EVENT_RING:
@ -330,7 +331,7 @@ static unsigned long uaudio_iommu_map(enum mem_type mtype, phys_addr_t pa,
sg_len = PAGE_ALIGN(sg->offset + sg->length);
pa_sg = page_to_phys(sg_page(sg));
ret = iommu_map(uaudio_qdev->domain, va_sg, pa_sg, sg_len,
IOMMU_READ | IOMMU_WRITE | IOMMU_MMIO);
prot);
if (ret) {
uaudio_err("mapping failed ret%d\n", ret);
uaudio_err("memtype:%d, pa:%pK iova:%lu sg_len:%zu\n",
@ -341,6 +342,9 @@ static unsigned long uaudio_iommu_map(enum mem_type mtype, phys_addr_t pa,
}
uaudio_dbg("memtype %d:map pa:%pK to iova:%lu len:%zu\n", mtype,
&pa_sg, va_sg, sg_len);
/* Invalidate cpu cache for device to access shared memory */
dma_sync_single_for_device(uaudio_qdev->dev, va_sg, sg_len,
DMA_TO_DEVICE);
va_sg += sg_len;
total_len += sg_len;
}
@ -357,11 +361,15 @@ skip_sgt_map:
uaudio_dbg("memtype:%d map pa:%pK to iova %lu size:%zu\n", mtype, &pa,
va, size);
ret = iommu_map(uaudio_qdev->domain, va, pa, size,
IOMMU_READ | IOMMU_WRITE | IOMMU_MMIO);
if (ret)
ret = iommu_map(uaudio_qdev->domain, va, pa, size, prot);
if (ret) {
uaudio_err("failed to map pa:%pK iova:%lu memtype:%d ret:%d\n",
&pa, va, mtype, ret);
goto done;
}
/* Invalidate cpu cache for device to access shared memory */
dma_sync_single_for_device(uaudio_qdev->dev, va, size, DMA_TO_DEVICE);
done:
return va;
}