From 085f88710f6eb7c6438bf4d99460dff91161aa47 Mon Sep 17 00:00:00 2001 From: Alistair Strachan Date: Wed, 2 May 2018 21:45:21 -0700 Subject: [PATCH] staging: Android: vsoc: Create wc kernel mapping for region shm. MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Map the region shm as write-combining instead of uncachable. Cc: Greg Kroah-Hartman Cc: Arve Hjønnevåg Cc: Todd Kjos Cc: Martijn Coenen Cc: Greg Hartman Cc: devel@driverdev.osuosl.org Cc: kernel-team@android.com Signed-off-by: Alistair Strachan Signed-off-by: Greg Kroah-Hartman --- drivers/staging/android/TODO | 1 - drivers/staging/android/vsoc.c | 4 +--- 2 files changed, 1 insertion(+), 4 deletions(-) diff --git a/drivers/staging/android/TODO b/drivers/staging/android/TODO index 6aab759..fbf015c 100644 --- a/drivers/staging/android/TODO +++ b/drivers/staging/android/TODO @@ -17,7 +17,6 @@ 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 This functionality has been superseded by the futex and is there for legacy reasons. diff --git a/drivers/staging/android/vsoc.c b/drivers/staging/android/vsoc.c index 587c66d..794137b 100644 --- a/drivers/staging/android/vsoc.c +++ b/drivers/staging/android/vsoc.c @@ -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); -- 2.7.4