search for: kmap_local_page

kmap_atomic() is deprecated in favor of kmap_local_page() since commit f3ba3c710ac5 ("mm/highmem: Provide kmap_local*"). With kmap_local_page() the mappings are per thread, CPU local, can take page-faults, and can be called from any context (including interrupts). Furthermore, the tasks can be preempted and, when they are scheduled to run aga...

...----------- mm/highmem.c | 6 ++++ 3 files changed, 81 insertions(+), 16 deletions(-) --- a/include/linux/highmem-internal.h +++ b/include/linux/highmem-internal.h @@ -69,6 +69,26 @@ static inline void kmap_flush_unused(voi __kmap_flush_unused(); } +static inline void *kmap_local_page(struct page *page) +{ + return __kmap_local_page_prot(page, kmap_prot); +} + +static inline void *kmap_local_page_prot(struct page *page, pgprot_t prot) +{ + return __kmap_local_page_prot(page, prot); +} + +static inline void *kmap_local_pfn(unsigned long pfn) +{ + return __kmap_local_pfn_prot(pfn,...

On Thu, Mar 16, 2023 at 10:13:39AM +0100, Fabio M. De Francesco wrote: >On gioved? 2 marzo 2023 12:34:16 CET Stefano Garzarella wrote: >> kmap_atomic() is deprecated in favor of kmap_local_page(). >> >> With kmap_local_page() the mappings are per thread, CPU local, can take >> page-faults, and can be called from any context (including interrupts). >> Furthermore, the tasks can be preempted and, when they are scheduled to >> run again, the kernel virtual addre...

...el.org/lkml/20230302113421.174582-1-sgarzare at redhat.com/ RFC v1: https://lore.kernel.org/lkml/20221214163025.103075-1-sgarzare at redhat.com/ Stefano Garzarella (8): vdpa: add bind_mm/unbind_mm callbacks vhost-vdpa: use bind_mm/unbind_mm device callbacks vringh: replace kmap_atomic() with kmap_local_page() vringh: support VA with iotlb vdpa_sim: make devices agnostic for work management vdpa_sim: use kthread worker vdpa_sim: replace the spinlock with a mutex to protect the state vdpa_sim: add support for user VA drivers/vdpa/vdpa_sim/vdpa_sim.h | 11 +- include/linux/vdpa.h...

...to use user VA in the iotlb messages. So, let's add support for user VA in vringh to use it in the vDPA simulators. Signed-off-by: Stefano Garzarella <sgarzare at redhat.com> --- Notes: v3: - refactored avoiding code duplication [Eugenio] v2: - replace kmap_atomic() with kmap_local_page() [see previous patch] - fix cast warnings when build with W=1 C=1 include/linux/vringh.h | 5 +- drivers/vdpa/mlx5/net/mlx5_vnet.c | 2 +- drivers/vdpa/vdpa_sim/vdpa_sim.c | 4 +- drivers/vhost/vringh.c | 153 +++++++++++++++++++++++------- 4 files changed, 127 i...

...or now, maybe ?useful to support cgroups) [Jason] - add unbind_mm callback [Jason] - call the new unbind_mm callback during the release [Jason] - avoid to call bind_mm callback after the reset, since the device ?is not detaching it now during the reset - added new patch replace kmap_atomic() with kmap_local_page() since ?checkpatch.pl complained about deprecation of kmap_atomic() touched ?by a patch in this series - fix cast warnings when build with W=1 C=1 - added new patch to replace the spinlock with a mutex [Jason] - `use_va` set to true by default [Eugenio] - supported the new unbind_mm callback [Ja...

...9;s add support for user VA in vringh to use it in the vDPA > simulators. > > Signed-off-by: Stefano Garzarella <sgarzare at redhat.com> > --- > > Notes: > v3: > - refactored avoiding code duplication [Eugenio] > v2: > - replace kmap_atomic() with kmap_local_page() [see previous patch] > - fix cast warnings when build with W=1 C=1 > > include/linux/vringh.h | 5 +- > drivers/vdpa/mlx5/net/mlx5_vnet.c | 2 +- > drivers/vdpa/vdpa_sim/vdpa_sim.c | 4 +- > drivers/vhost/vringh.c | 153 +++++++++++++++++++++++--...

...el.org/lkml/20230302113421.174582-1-sgarzare at redhat.com/ RFC v1: https://lore.kernel.org/lkml/20221214163025.103075-1-sgarzare at redhat.com/ Stefano Garzarella (9): vdpa: add bind_mm/unbind_mm callbacks vhost-vdpa: use bind_mm/unbind_mm device callbacks vringh: replace kmap_atomic() with kmap_local_page() vringh: define the stride used for translation vringh: support VA with iotlb vdpa_sim: make devices agnostic for work management vdpa_sim: use kthread worker vdpa_sim: replace the spinlock with a mutex to protect the state vdpa_sim: add support for user VA drivers/vdpa/vdpa_sim/vdpa...

Following up to the discussion in: https://lore.kernel.org/r/20200914204209.256266093 at linutronix.de and the second version of this: https://lore.kernel.org/r/20201029221806.189523375 at linutronix.de this series provides a preemptible variant of kmap_atomic & related interfaces. This is achieved by: - Removing the RT dependency from migrate_disable/enable() - Consolidating all

Following up to the discussion in: https://lore.kernel.org/r/20200914204209.256266093 at linutronix.de and the second version of this: https://lore.kernel.org/r/20201029221806.189523375 at linutronix.de this series provides a preemptible variant of kmap_atomic & related interfaces. This is achieved by: - Removing the RT dependency from migrate_disable/enable() - Consolidating all

Following up to the discussion in: https://lore.kernel.org/r/20200914204209.256266093 at linutronix.de and the second version of this: https://lore.kernel.org/r/20201029221806.189523375 at linutronix.de this series provides a preemptible variant of kmap_atomic & related interfaces. This is achieved by: - Removing the RT dependency from migrate_disable/enable() - Consolidating all