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2 hours, 50 minutes

[PATCH v7 0/8] dma-buf: Use revoke mechanism to invalidate shared buffers

by Leon Romanovsky

Changelog: v7: * Fixed messed VFIO patch due to rebase. v6: https://patch.msgid.link/20260130-dmabuf-revoke-v6-0-06278f9b7bf0@nvidia.com * Added Reviewed-by tags. * Changed for blocking wait_for_completion() in VFIO * Fixed race between ->attach and move_notify, where priv->revoked is flipped and lock is released. v5: https://patch.msgid.link/20260124-dmabuf-revoke-v5-0-f98fca917e96@nvidia.com * Documented the DMA-BUF expectations around DMA unmap. * Added wait support in VFIO for DMA unmap. * Reordered patches. * Improved commit messages to document even more. v4: https://lore.kernel.org/all/20260121-dmabuf-revoke-v4-0-d311cbc8633d@nvidia… * Changed DMA_RESV_USAGE_KERNEL to DMA_RESV_USAGE_BOOKKEEP. * Made .invalidate_mapping() truly optional. * Added patch which renames dma_buf_move_notify() to be dma_buf_invalidate_mappings(). * Restored dma_buf_attachment_is_dynamic() function. v3: https://lore.kernel.org/all/20260120-dmabuf-revoke-v3-0-b7e0b07b8214@nvidia… * Used Jason's wordings for commits and cover letter. * Removed IOMMUFD patch. * Renamed dma_buf_attachment_is_revoke() to be dma_buf_attach_revocable(). * Added patch to remove CONFIG_DMABUF_MOVE_NOTIFY. * Added Reviewed-by tags. * Called to dma_resv_wait_timeout() after dma_buf_move_notify() in VFIO. * Added dma_buf_attach_revocable() check to VFIO DMABUF attach function. * Slightly changed commit messages. v2: https://patch.msgid.link/20260118-dmabuf-revoke-v2-0-a03bb27c0875@nvidia.com * Changed series to document the revoke semantics instead of implementing it. v1: https://patch.msgid.link/20260111-dmabuf-revoke-v1-0-fb4bcc8c259b@nvidia.com ------------------------------------------------------------------------- This series is based on latest VFIO fix, which will be sent to Linus very soon. https://lore.kernel.org/all/20260121-vfio-add-pin-v1-1-4e04916b17f1@nvidia.… Thanks ------------------------------------------------------------------------- This series documents a dma-buf “revoke” mechanism: to allow a dma-buf exporter to explicitly invalidate (“kill”) a shared buffer after it has been distributed to importers, so that further CPU and device access is prevented and importers reliably observe failure. The change in this series is to properly document and use existing core “revoked” state on the dma-buf object and a corresponding exporter-triggered revoke operation. dma-buf has quietly allowed calling move_notify on pinned dma-bufs, even though legacy importers using dma_buf_attach() would simply ignore these calls. The intention was that move_notify() would tell the importer to expedite it's unmapping process and once the importer is fully finished with DMA it would unmap the dma-buf which finally signals that the importer is no longer ever going to touch the memory again. Importers that touch past their unmap() call can trigger IOMMU errors, AER and beyond, however read-and-discard access between move_notify() and unmap is allowed. Thus, we can define the exporter's revoke sequence for pinned dma-buf as: dma_resv_lock(dmabuf->resv, NULL); // Prevent new mappings from being established priv->revoked = true; // Tell all importers to eventually unmap dma_buf_invalidate_mappings(dmabuf); // Wait for any inprogress fences on the old mapping dma_resv_wait_timeout(dmabuf->resv, DMA_RESV_USAGE_BOOKKEEP, false, MAX_SCHEDULE_TIMEOUT); dma_resv_unlock(dmabuf->resv, NULL); // Wait for all importers to complete unmap wait_for_completion(&priv->unmapp_comp); However, dma-buf also supports importers that don't do anything on move_notify(), and will not unmap the buffer in bounded time. Since such importers would cause the above sequence to hang, a new mechanism is needed to detect incompatible importers. Introduce dma_buf_attach_revocable() which if true indicates the above sequence is safe to use and will complete in kernel-only bounded time for this attachment. Unfortunately dma_buf_attach_revocable() is going to fail for the popular RDMA pinned importer, which means we cannot introduce it to existing places using pinned move_notify() without potentially breaking existing userspace flows. Existing exporters that only trigger this flow for RAS errors should not call dma_buf_attach_revocable() and will suffer an unbounded block on the final completion, hoping that the userspace will notice the RAS and clean things up. Without revoke support on the RDMA pinned importers it doesn't seem like any other non-breaking option is currently possible. For new exporters, like VFIO and RDMA, that have userspace triggered revoke events, the unbouned sleep would not be acceptable. They can call dma_buf_attach_revocable() and will not work with the RDMA pinned importer from day 0, preventing regressions. In the process add documentation explaining the above details. Thanks Signed-off-by: Leon Romanovsky <leonro(a)nvidia.com> --- Leon Romanovsky (8): dma-buf: Rename .move_notify() callback to a clearer identifier dma-buf: Rename dma_buf_move_notify() to dma_buf_invalidate_mappings() dma-buf: Always build with DMABUF_MOVE_NOTIFY vfio: Wait for dma-buf invalidation to complete dma-buf: Make .invalidate_mapping() truly optional dma-buf: Add dma_buf_attach_revocable() vfio: Permit VFIO to work with pinned importers iommufd: Add dma_buf_pin() drivers/dma-buf/Kconfig | 12 ----- drivers/dma-buf/dma-buf.c | 69 ++++++++++++++++++++----- drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 14 ++--- drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 2 +- drivers/gpu/drm/amd/amdkfd/Kconfig | 2 +- drivers/gpu/drm/virtio/virtgpu_prime.c | 2 +- drivers/gpu/drm/xe/tests/xe_dma_buf.c | 7 ++- drivers/gpu/drm/xe/xe_bo.c | 2 +- drivers/gpu/drm/xe/xe_dma_buf.c | 14 ++--- drivers/infiniband/core/umem_dmabuf.c | 13 ----- drivers/infiniband/hw/mlx5/mr.c | 2 +- drivers/iommu/iommufd/pages.c | 11 +++- drivers/iommu/iommufd/selftest.c | 2 +- drivers/vfio/pci/vfio_pci_dmabuf.c | 80 ++++++++++++++++++++++------- include/linux/dma-buf.h | 17 +++--- 15 files changed, 153 insertions(+), 96 deletions(-) --- base-commit: 61ceaf236115f20f4fdd7cf60f883ada1063349a change-id: 20251221-dmabuf-revoke-b90ef16e4236 Best regards, -- Leon Romanovsky <leonro(a)nvidia.com>

2 hours, 55 minutes

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4 hours, 11 minutes

Re: [PATCH 09/13] dt-bindings: serial: fsl-linflexuart: add dma properties

by Krzysztof Kozlowski

On Mon, Feb 16, 2026 at 05:29:57PM +0200, Daniel Baluta wrote: > > On 2/16/26 17:02, Larisa Grigore wrote: > > [You don't often get email from larisa.grigore(a)oss.nxp.com. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ] > > > > From: Radu Pirea <radu-nicolae.pirea(a)nxp.com> > > > > Add 'dmas' and 'dma-names' properties to describe optional DMA support > > for RX and TX channels in the LINFlexD UART controller. > > > > This allows the device tree to specify DMA channels used for UART data > > transfers. If not specified, the driver will fall to interrupt-based > > operations. > > > > Signed-off-by: Radu Pirea <radu-nicolae.pirea(a)nxp.com> > > Co-developed-by: Larisa Grigore <larisa.grigore(a)oss.nxp.com> > > Signed-off-by: Larisa Grigore <larisa.grigore(a)oss.nxp.com> > > If both of you worked on this patch then the last lines must read: > > Co-developed-by: Radu Pirea <radu-nicolae.pirea(a)nxp.com> > > Signed-off-by: Radu Pirea <radu-nicolae.pirea(a)nxp.com> > > Co-developed-by: Larisa Grigore <larisa.grigore(a)oss.nxp.com> > > Signed-off-by: Larisa Grigore <larisa.grigore(a)oss.nxp.com> No, the DCO with this authorship is correct if they both worked. Nothing has to be changed here. Best regards, Krzysztof

8 hours, 19 minutes

Re: [PATCH 12/13] serial: linflexuart: Add DMA support

by kernel test robot

Hi Larisa, kernel test robot noticed the following build warnings: [auto build test WARNING on tty/tty-testing] [also build test WARNING on tty/tty-next tty/tty-linus usb/usb-testing usb/usb-next usb/usb-linus robh/for-next linus/master v6.19 next-20260216] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Larisa-Grigore/serial-linfle… base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-testing patch link: https://lore.kernel.org/r/20260216150205.212318-13-larisa.grigore%40oss.nxp… patch subject: [PATCH 12/13] serial: linflexuart: Add DMA support config: i386-buildonly-randconfig-002-20260217 (https://download.01.org/0day-ci/archive/20260217/202602171112.rMhRspEp-lkp@…) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260217/202602171112.rMhRspEp-lkp@…) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp(a)intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202602171112.rMhRspEp-lkp@intel.com/ All warnings (new ones prefixed by >>): >> drivers/tty/serial/fsl_linflexuart.c:1095:6: warning: variable 'baud' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] 1095 | if (port->uartclk) { | ^~~~~~~~~~~~~ drivers/tty/serial/fsl_linflexuart.c:1113:67: note: uninitialized use occurs here 1113 | lfport->dma_rx_timeout = msecs_to_jiffies(DIV_ROUND_UP(10000000, baud)); | ^~~~ include/linux/math.h:49:22: note: expanded from macro 'DIV_ROUND_UP' 49 | #define DIV_ROUND_UP __KERNEL_DIV_ROUND_UP | ^ include/uapi/linux/const.h:51:46: note: expanded from macro '__KERNEL_DIV_ROUND_UP' 51 | #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) | ^ drivers/tty/serial/fsl_linflexuart.c:1095:2: note: remove the 'if' if its condition is always true 1095 | if (port->uartclk) { | ^~~~~~~~~~~~~~~~~~ drivers/tty/serial/fsl_linflexuart.c:970:19: note: initialize the variable 'baud' to silence this warning 970 | unsigned int baud; | ^ | = 0 drivers/tty/serial/fsl_linflexuart.c:205:13: warning: unused function 'linflex_console_putchar' [-Wunused-function] 205 | static void linflex_console_putchar(struct uart_port *port, unsigned char ch); | ^~~~~~~~~~~~~~~~~~~~~~~ 2 warnings generated. vim +1095 drivers/tty/serial/fsl_linflexuart.c 1d3f5f07fafc712 Radu Pirea 2026-02-16 959 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 960 static void 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 961 linflex_set_termios(struct uart_port *port, struct ktermios *termios, bec5b814d46c2a7 Ilpo Järvinen 2022-08-16 962 const struct ktermios *old) 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 963 { 0b34325c5f79f1f Larisa Grigore 2026-02-16 964 struct linflex_port *lfport = to_linflex_port(port); 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 965 unsigned long flags; 1312e6586227421 Larisa Grigore 2026-02-16 966 unsigned long cr, old_cr, cr1, gcr; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 967 unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8; 1d3f5f07fafc712 Radu Pirea 2026-02-16 968 unsigned long ibr, fbr, divisr, dividr; 1d3f5f07fafc712 Radu Pirea 2026-02-16 969 unsigned char ldiv_mul; 1d3f5f07fafc712 Radu Pirea 2026-02-16 970 unsigned int baud; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 971 a75137a58feb092 Radu Pirea 2026-02-16 972 uart_port_lock_irqsave(port, &flags); a75137a58feb092 Radu Pirea 2026-02-16 973 0b34325c5f79f1f Larisa Grigore 2026-02-16 974 _linflex_stop_rx(port); 0b34325c5f79f1f Larisa Grigore 2026-02-16 975 _linflex_stop_tx(port); 0b34325c5f79f1f Larisa Grigore 2026-02-16 976 fb1da4d7f0bec28 Larisa Grigore 2026-02-16 977 old_cr = readl(port->membase + UARTCR) & fb1da4d7f0bec28 Larisa Grigore 2026-02-16 978 ~(LINFLEXD_UARTCR_RXEN | LINFLEXD_UARTCR_TXEN); fb1da4d7f0bec28 Larisa Grigore 2026-02-16 979 cr = old_cr; fb1da4d7f0bec28 Larisa Grigore 2026-02-16 980 fb1da4d7f0bec28 Larisa Grigore 2026-02-16 981 /* In FIFO mode, we should make sure the fifo is empty fb1da4d7f0bec28 Larisa Grigore 2026-02-16 982 * before entering INITM. fb1da4d7f0bec28 Larisa Grigore 2026-02-16 983 */ fb1da4d7f0bec28 Larisa Grigore 2026-02-16 984 linflex_wait_tx_fifo_empty(port); fb1da4d7f0bec28 Larisa Grigore 2026-02-16 985 fb1da4d7f0bec28 Larisa Grigore 2026-02-16 986 /* disable transmit and receive */ fb1da4d7f0bec28 Larisa Grigore 2026-02-16 987 writel(old_cr, port->membase + UARTCR); 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 988 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 989 /* Enter initialization mode by setting INIT bit */ 5e8e1ccacae0470 Larisa Grigore 2026-02-16 990 cr1 = LINFLEXD_LINCR1_INIT | LINFLEXD_LINCR1_MME; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 991 writel(cr1, port->membase + LINCR1); 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 992 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 993 /* wait for init mode entry */ 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 994 while ((readl(port->membase + LINSR) 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 995 & LINFLEXD_LINSR_LINS_MASK) 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 996 != LINFLEXD_LINSR_LINS_INITMODE) 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 997 ; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 998 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 999 /* 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1000 * only support CS8 and CS7, and for CS7 must enable PE. 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1001 * supported mode: 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1002 * - (7,e/o,1) 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1003 * - (8,n,1) 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1004 * - (8,e/o,1) 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1005 */ 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1006 /* enter the UART into configuration mode */ 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1007 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1008 while ((termios->c_cflag & CSIZE) != CS8 && 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1009 (termios->c_cflag & CSIZE) != CS7) { 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1010 termios->c_cflag &= ~CSIZE; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1011 termios->c_cflag |= old_csize; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1012 old_csize = CS8; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1013 } 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1014 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1015 if ((termios->c_cflag & CSIZE) == CS7) { 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1016 /* Word length: WL1WL0:00 */ 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1017 cr = old_cr & ~LINFLEXD_UARTCR_WL1 & ~LINFLEXD_UARTCR_WL0; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1018 } 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1019 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1020 if ((termios->c_cflag & CSIZE) == CS8) { 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1021 /* Word length: WL1WL0:01 */ 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1022 cr = (old_cr | LINFLEXD_UARTCR_WL0) & ~LINFLEXD_UARTCR_WL1; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1023 } 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1024 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1025 if (termios->c_cflag & CMSPAR) { 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1026 if ((termios->c_cflag & CSIZE) != CS8) { 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1027 termios->c_cflag &= ~CSIZE; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1028 termios->c_cflag |= CS8; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1029 } 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1030 /* has a space/sticky bit */ 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1031 cr |= LINFLEXD_UARTCR_WL0; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1032 } 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1033 1312e6586227421 Larisa Grigore 2026-02-16 1034 gcr = readl(port->membase + GCR); 1312e6586227421 Larisa Grigore 2026-02-16 1035 1312e6586227421 Larisa Grigore 2026-02-16 1036 if (termios->c_cflag & CSTOPB) { 1312e6586227421 Larisa Grigore 2026-02-16 1037 /* Use 2 stop bits. */ 1312e6586227421 Larisa Grigore 2026-02-16 1038 cr = (cr & ~LINFLEXD_UARTCR_SBUR_MASK) | 1312e6586227421 Larisa Grigore 2026-02-16 1039 LINFLEXD_UARTCR_SBUR_2SBITS; 1312e6586227421 Larisa Grigore 2026-02-16 1040 /* Set STOP in GCR field for 2 stop bits. */ 1312e6586227421 Larisa Grigore 2026-02-16 1041 gcr = (gcr & ~LINFLEXD_GCR_STOP_MASK) | 1312e6586227421 Larisa Grigore 2026-02-16 1042 LINFLEXD_GCR_STOP_2SBITS; 1312e6586227421 Larisa Grigore 2026-02-16 1043 } else { 1312e6586227421 Larisa Grigore 2026-02-16 1044 /* Use 1 stop bit. */ 1312e6586227421 Larisa Grigore 2026-02-16 1045 cr = (cr & ~LINFLEXD_UARTCR_SBUR_MASK) | 1312e6586227421 Larisa Grigore 2026-02-16 1046 LINFLEXD_UARTCR_SBUR_1SBITS; 1312e6586227421 Larisa Grigore 2026-02-16 1047 /* Set STOP in GCR field for 1 stop bit. */ 1312e6586227421 Larisa Grigore 2026-02-16 1048 gcr = (gcr & ~LINFLEXD_GCR_STOP_MASK) | 1312e6586227421 Larisa Grigore 2026-02-16 1049 LINFLEXD_GCR_STOP_1SBITS; 1312e6586227421 Larisa Grigore 2026-02-16 1050 } 1312e6586227421 Larisa Grigore 2026-02-16 1051 /* Update GCR register. */ 1312e6586227421 Larisa Grigore 2026-02-16 1052 writel(gcr, port->membase + GCR); 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1053 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1054 /* parity must be enabled when CS7 to match 8-bits format */ 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1055 if ((termios->c_cflag & CSIZE) == CS7) 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1056 termios->c_cflag |= PARENB; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1057 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1058 if ((termios->c_cflag & PARENB)) { 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1059 cr |= LINFLEXD_UARTCR_PCE; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1060 if (termios->c_cflag & PARODD) 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1061 cr = (cr | LINFLEXD_UARTCR_PC0) & 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1062 (~LINFLEXD_UARTCR_PC1); 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1063 else 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1064 cr = cr & (~LINFLEXD_UARTCR_PC1 & 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1065 ~LINFLEXD_UARTCR_PC0); 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1066 } else { 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1067 cr &= ~LINFLEXD_UARTCR_PCE; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1068 } 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1069 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1070 port->read_status_mask = 0; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1071 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1072 if (termios->c_iflag & INPCK) 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1073 port->read_status_mask |= (LINFLEXD_UARTSR_FEF | 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1074 LINFLEXD_UARTSR_PE0 | 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1075 LINFLEXD_UARTSR_PE1 | 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1076 LINFLEXD_UARTSR_PE2 | 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1077 LINFLEXD_UARTSR_PE3); 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1078 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1079 port->read_status_mask |= LINFLEXD_UARTSR_FEF; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1080 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1081 /* characters to ignore */ 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1082 port->ignore_status_mask = 0; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1083 if (termios->c_iflag & IGNPAR) 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1084 port->ignore_status_mask |= LINFLEXD_UARTSR_PE; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1085 if (termios->c_iflag & IGNBRK) { 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1086 port->ignore_status_mask |= LINFLEXD_UARTSR_PE; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1087 /* 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1088 * if we're ignoring parity and break indicators, 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1089 * ignore overruns too (for real raw support). 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1090 */ 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1091 if (termios->c_iflag & IGNPAR) 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1092 port->ignore_status_mask |= LINFLEXD_UARTSR_BOF; 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1093 } 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1094 1d3f5f07fafc712 Radu Pirea 2026-02-16 @1095 if (port->uartclk) { 1d3f5f07fafc712 Radu Pirea 2026-02-16 1096 ldiv_mul = linflex_ldiv_multiplier(port); 1d3f5f07fafc712 Radu Pirea 2026-02-16 1097 baud = uart_get_baud_rate(port, termios, old, 0, 1d3f5f07fafc712 Radu Pirea 2026-02-16 1098 port->uartclk / ldiv_mul); 1d3f5f07fafc712 Radu Pirea 2026-02-16 1099 1d3f5f07fafc712 Radu Pirea 2026-02-16 1100 /* update the per-port timeout */ 1d3f5f07fafc712 Radu Pirea 2026-02-16 1101 uart_update_timeout(port, termios->c_cflag, baud); 1d3f5f07fafc712 Radu Pirea 2026-02-16 1102 1d3f5f07fafc712 Radu Pirea 2026-02-16 1103 divisr = port->uartclk; 1d3f5f07fafc712 Radu Pirea 2026-02-16 1104 dividr = ((unsigned long)baud * ldiv_mul); 1d3f5f07fafc712 Radu Pirea 2026-02-16 1105 1d3f5f07fafc712 Radu Pirea 2026-02-16 1106 ibr = divisr / dividr; 1d3f5f07fafc712 Radu Pirea 2026-02-16 1107 fbr = ((divisr % dividr) * 16 / dividr) & 0xF; 1d3f5f07fafc712 Radu Pirea 2026-02-16 1108 1d3f5f07fafc712 Radu Pirea 2026-02-16 1109 writel(ibr, port->membase + LINIBRR); 1d3f5f07fafc712 Radu Pirea 2026-02-16 1110 writel(fbr, port->membase + LINFBRR); 1d3f5f07fafc712 Radu Pirea 2026-02-16 1111 } 1d3f5f07fafc712 Radu Pirea 2026-02-16 1112 0b34325c5f79f1f Larisa Grigore 2026-02-16 1113 lfport->dma_rx_timeout = msecs_to_jiffies(DIV_ROUND_UP(10000000, baud)); 0b34325c5f79f1f Larisa Grigore 2026-02-16 1114 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1115 writel(cr, port->membase + UARTCR); 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1116 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1117 cr1 &= ~(LINFLEXD_LINCR1_INIT); 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1118 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1119 writel(cr1, port->membase + LINCR1); 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1120 fb1da4d7f0bec28 Larisa Grigore 2026-02-16 1121 cr |= (LINFLEXD_UARTCR_TXEN) | (LINFLEXD_UARTCR_RXEN); fb1da4d7f0bec28 Larisa Grigore 2026-02-16 1122 writel(cr, port->membase + UARTCR); fb1da4d7f0bec28 Larisa Grigore 2026-02-16 1123 0b34325c5f79f1f Larisa Grigore 2026-02-16 1124 _linflex_start_rx(port); 0b34325c5f79f1f Larisa Grigore 2026-02-16 1125 _linflex_start_tx(port); 0b34325c5f79f1f Larisa Grigore 2026-02-16 1126 7c6725ffd581335 Thomas Gleixner 2023-09-14 1127 uart_port_unlock_irqrestore(port, flags); 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1128 } 09864c1cdf5c537 Stefan-gabriel Mirea 2019-08-09 1129 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

13 hours, 3 minutes

Re: [PATCH 12/13] serial: linflexuart: Add DMA support

by kernel test robot

19 hours, 41 minutes

Re: [PATCH 08/13] dt-bindings: serial: fsl-linflexuart: add clock input properties

by Krzysztof Kozlowski

On 16/02/2026 16:02, Larisa Grigore wrote: > From: Radu Pirea <radu-nicolae.pirea(a)nxp.com> > > Add optional support for the two clock inputs used by the LINFlexD UART > controller: > - "lin": LIN_BAUD_CLK > - "ipg": LINFLEXD_CLK > > The clock inputs are kept optional to maintain compatibility with the > S32V234 platform. Does S32V234 have the clocks? I don't understand the "maintain compatibility" in this context. Either you have or you have not clocks, which should be expressed in schema (: false, see example schema). > > Signed-off-by: Radu Pirea <radu-nicolae.pirea(a)nxp.com> > Co-developed-by: Larisa Grigore <larisa.grigore(a)oss.nxp.com> > Signed-off-by: Larisa Grigore <larisa.grigore(a)oss.nxp.com> > --- > .../bindings/serial/fsl,s32-linflexuart.yaml | 18 ++++++++++++++++++ > 1 file changed, 18 insertions(+) > > diff --git a/Documentation/devicetree/bindings/serial/fsl,s32-linflexuart.yaml b/Documentation/devicetree/bindings/serial/fsl,s32-linflexuart.yaml > index 4171f524a928..885f0b1b3492 100644 > --- a/Documentation/devicetree/bindings/serial/fsl,s32-linflexuart.yaml > +++ b/Documentation/devicetree/bindings/serial/fsl,s32-linflexuart.yaml > @@ -34,6 +34,14 @@ properties: > interrupts: > maxItems: 1 > > + clocks: > + maxItems: 2 > + > + clock-names: > + items: > + - const: lin > + - const: ipg > + > required: > - compatible > - reg > @@ -48,3 +56,13 @@ examples: > reg = <0x40053000 0x1000>; > interrupts = <0 59 4>; > }; > + > + - | > + serial@401c8000 { > + compatible = "nxp,s32g2-linflexuart", > + "fsl,s32v234-linflexuart"; > + reg = <0x401C8000 0x3000>; > + interrupts = <0 82 1>; > + clocks = <&clks 14>, <&clks 13>; > + clock-names = "lin", "ipg"; Just add the clocks to existing example. No need for new example for each new property. > + }; Best regards, Krzysztof

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