Re: [PATCH 15/21] ARM: dma-mapping: always invalidate WT caches before DMA

On Fri, Mar 31, 2023, at 13:08, Russell King (Oracle) wrote: > On Fri, Mar 31, 2023 at 12:38:45PM +0200, Arnd Bergmann wrote: >> On Fri, Mar 31, 2023, at 11:35, Russell King (Oracle) wrote: >> > On Fri, Mar 31, 2023 at 10:07:28AM +0100, Russell King (Oracle) wrote: >> >> On Mon, Mar 27, 2023 at

Re: [PATCH 15/21] ARM: dma-mapping: always invalidate WT caches before DMA

On Fri, Mar 31, 2023 at 12:38:45PM +0200, Arnd Bergmann wrote: > On Fri, Mar 31, 2023, at 11:35, Russell King (Oracle) wrote: > > On Fri, Mar 31, 2023 at 10:07:28AM +0100, Russell King (Oracle) wrote: > >> On Mon, Mar 27, 2023 at 02:13:11PM +0200, Arnd Bergmann wrote: > >> > From: Arnd Bergmann >

RE: [PATCH 15/21] ARM: dma-mapping: always invalidate WT caches before DMA

From: Arnd Bergmann > Sent: 31 March 2023 11:39 ... > Most architectures that have write-through caches (m68k, > microblaze) or write-back caches but no speculation (all other > armv4/armv5, hexagon, openrisc, sh, most mips, later xtensa) > only invalidate before DMA but not after. > > OTOH, most

Re: [PATCH 15/21] ARM: dma-mapping: always invalidate WT caches before DMA

On Fri, Mar 31, 2023, at 11:35, Russell King (Oracle) wrote: > On Fri, Mar 31, 2023 at 10:07:28AM +0100, Russell King (Oracle) wrote: >> On Mon, Mar 27, 2023 at 02:13:11PM +0200, Arnd Bergmann wrote: >> > From: Arnd Bergmann >> > >> > Most ARM CPUs can have write-back caches and that require >>

Re: [PATCH 15/21] ARM: dma-mapping: always invalidate WT caches before DMA

On Fri, Mar 31, 2023 at 10:07:28AM +0100, Russell King (Oracle) wrote: > On Mon, Mar 27, 2023 at 02:13:11PM +0200, Arnd Bergmann wrote: > > From: Arnd Bergmann > > > > Most ARM CPUs can have write-back caches and that require > > cache management to be done in the dma_sync_*_for_device() > >

Re: [PATCH 15/21] ARM: dma-mapping: always invalidate WT caches before DMA

On Mon, Mar 27, 2023 at 02:13:11PM +0200, Arnd Bergmann wrote: > From: Arnd Bergmann > > Most ARM CPUs can have write-back caches and that require > cache management to be done in the dma_sync_*_for_device() > operation. This is typically done in both writeback and > writethrough mode. > > The

Re: [PATCH 15/21] ARM: dma-mapping: always invalidate WT caches before DMA

On Mon, Mar 27, 2023 at 2:16 PM Arnd Bergmann wrote: > From: Arnd Bergmann > > Most ARM CPUs can have write-back caches and that require > cache management to be done in the dma_sync_*_for_device() > operation. This is typically done in both writeback and > writethrough mode. > > The cache-v4.S