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Commit a69d100f authored by Alistair Strachan's avatar Alistair Strachan
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FROMLIST: staging: vsoc: Create wc kernel mapping for region shm. 



Map the region shm as write-combining instead of uncacheable.

Signed-off-by: default avatarAlistair Strachan <astrachan@google.com>
[sent upstream via staging TODO]
Bug: 702147120
Change-Id: If587b4f26abaa3580b889b04dbb655f8d5b4a8ee
parent c50e5cb3

drivers/staging/android/TODO

+0 −1
Original line number Diff line number Diff line
@@ -18,7 +18,6 @@ vsoc.c, uapi/vsoc_shm.h 
   waiting threads. We should eventually use multiple queues and select the

   queue based on the region.

 - Add debugfs support for examining the permissions of regions.

 - Use ioremap_wc instead of ioremap_nocache.

 - Remove VSOC_WAIT_FOR_INCOMING_INTERRUPT ioctl. This functionality has been

   superseded by the futex and is there for legacy reasons.

drivers/staging/android/vsoc.c

+1 −3
Original line number Diff line number Diff line
@@ -802,9 +802,7 @@ static int vsoc_probe_device(struct pci_dev *pdev, 


	dev_info(&pdev->dev, "shared memory @ DMA %p size=0x%zx\n",

		 (void *)vsoc_dev.shm_phys_start, vsoc_dev.shm_size);

	/* TODO(ghartman): ioremap_wc should work here */

	vsoc_dev.kernel_mapped_shm = ioremap_nocache(

			vsoc_dev.shm_phys_start, vsoc_dev.shm_size);

	vsoc_dev.kernel_mapped_shm = pci_iomap_wc(pdev, SHARED_MEMORY_BAR, 0);

	if (!vsoc_dev.kernel_mapped_shm) {

		dev_err(&vsoc_dev.dev->dev, "cannot iomap region\n");

		vsoc_remove_device(pdev);