This is a note to let you know that I've just added the patch titled
intel_th: msu: Fix single mode with disabled IOMMU
to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-testing branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will be merged to the char-misc-next branch sometime soon, after it passes testing, and the merge window is open.
If you have any questions about this process, please let me know.
From 918b8646497b5dba6ae82d4a7325f01b258972b9 Mon Sep 17 00:00:00 2001
From: Alexander Shishkin alexander.shishkin@linux.intel.com Date: Fri, 21 Jun 2019 19:19:29 +0300 Subject: intel_th: msu: Fix single mode with disabled IOMMU
Commit 4e0eaf239fb3 ("intel_th: msu: Fix single mode with IOMMU") switched the single mode code to use dma mapping pages obtained from the page allocator, but with IOMMU disabled, that may lead to using SWIOTLB bounce buffers and without additional sync'ing, produces empty trace buffers.
Fix this by using a DMA32 GFP flag to the page allocation in single mode, as the device supports full 32-bit DMA addressing.
Signed-off-by: Alexander Shishkin alexander.shishkin@linux.intel.com Fixes: 4e0eaf239fb3 ("intel_th: msu: Fix single mode with IOMMU") Reviewed-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Reported-by: Ammy Yi ammy.yi@intel.com Cc: stable stable@vger.kernel.org Link: https://lore.kernel.org/r/20190621161930.60785-4-alexander.shishkin@linux.in... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/hwtracing/intel_th/msu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/hwtracing/intel_th/msu.c b/drivers/hwtracing/intel_th/msu.c index 6bfce03c6489..cfd48c81b9d9 100644 --- a/drivers/hwtracing/intel_th/msu.c +++ b/drivers/hwtracing/intel_th/msu.c @@ -667,7 +667,7 @@ static int msc_buffer_contig_alloc(struct msc *msc, unsigned long size) goto err_out;
ret = -ENOMEM; - page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order); + page = alloc_pages(GFP_KERNEL | __GFP_ZERO | GFP_DMA32, order); if (!page) goto err_free_sgt;