search for: io_tlb_end

...+++ b/kernel/dma/swiotlb.c @@ -667,3 +667,12 @@ size_t swiotlb_max_mapping_size(struct device *dev) { return ((size_t)1 << IO_TLB_SHIFT) * IO_TLB_SEGSIZE; } + +bool is_swiotlb_active(void) +{ + /* + * When SWIOTLB is initialized, even if io_tlb_start points to physical + * address zero, io_tlb_end surely doesn't. + */ + return io_tlb_end != 0; +} -- 2.17.1

Hi, here is the next version of this patch-set. Previous versions can be found here: V1: https://lore.kernel.org/lkml/20190110134433.15672-1-joro at 8bytes.org/ V2: https://lore.kernel.org/lkml/20190115132257.6426-1-joro at 8bytes.org/ V3: https://lore.kernel.org/lkml/20190123163049.24863-1-joro at 8bytes.org/ V4: https://lore.kernel.org/lkml/20190129084342.26030-1-joro at 8bytes.org/

...lb_memory; + void swiotlb_print_info(void) { unsigned long bytes = io_tlb_nslabs << IO_TLB_SHIFT; unsigned char *vstart, *vend; + if (no_iotlb_memory) { + pr_warn("software IO TLB: No low mem\n"); + return; + } + vstart = phys_to_virt(io_tlb_start); vend = phys_to_virt(io_tlb_end); @@ -136,7 +143,7 @@ void swiotlb_print_info(void) bytes >> 20, vstart, vend - 1); } -void __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose) +int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose) { void *v_overflow_buffer;...

...lb_memory; + void swiotlb_print_info(void) { unsigned long bytes = io_tlb_nslabs << IO_TLB_SHIFT; unsigned char *vstart, *vend; + if (no_iotlb_memory) { + pr_warn("software IO TLB: No low mem\n"); + return; + } + vstart = phys_to_virt(io_tlb_start); vend = phys_to_virt(io_tlb_end); @@ -136,7 +143,7 @@ void swiotlb_print_info(void) bytes >> 20, vstart, vend - 1); } -void __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose) +int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose) { void *v_overflow_buffer;...

Hi all, Here''s a work in progress series whcih does a partial revert of the previous swiotlb changes, and does a partial replacement with Becky Bruce''s series. The most important difference is Becky''s use of phys_addr_t rather than page+offset to represent arbitrary pages. This turns out to be simpler. I didn''t replicate the map_single_page changes, since

Hi Ingo, Here''s the chunk of patches to add Xen Dom0 support (it''s probably worth creating a new xen/dom0 topic branch for it). A dom0 Xen domain is basically the same as a normal domU domain, but it has extra privileges to directly access hardware. There are two issues to deal with: - translating to and from the domain''s pseudo-physical addresses and real machine

...d-black tree is not modified at run time; - add "swiotlb-xen: introduce xen_swiotlb_set_dma_mask"; - add "xen: introduce xen_alloc/free_coherent_pages"; - add "swiotlb-xen: use xen_alloc/free_coherent_pages"; - add "swiotlb: don''t assume that io_tlb_start-io_tlb_end is coherent". Changes in v4: - rename XENMEM_get_dma_buf to XENMEM_exchange_and_pin; - rename XENMEM_put_dma_buf to XENMEM_unpin; - improve the documentation of the new hypercalls; - add a note about out.address_bits for XENMEM_exchange; - code style fixes; - add err_out label in xen_dma_add_...