Author: cem
Date: Thu May 16 19:10:48 2019
New Revision: 347888
URL: https://svnweb.freebsd.org/changeset/base/347888
Log:
mips: Implement basic pmap_kenter_device, pmap_kremove_device
Unbreak mips.BERI_DE4_SDROOT build, which uses device xdma. Device xdma
depends on the pmap_kenter_device APIs.
Reported by: tinderbox (local)
Sponsored by: Dell EMC Isilon
Modified:
head/sys/mips/include/pmap.h
head/sys/mips/mips/pmap.c
Modified: head/sys/mips/include/pmap.h
==============================================================================
--- head/sys/mips/include/pmap.h Thu May 16 19:09:41 2019
(r347887)
+++ head/sys/mips/include/pmap.h Thu May 16 19:10:48 2019
(r347888)
@@ -177,7 +177,9 @@ void pmap_unmapdev(vm_offset_t, vm_size_t);
vm_offset_t pmap_steal_memory(vm_size_t size);
void pmap_kenter(vm_offset_t va, vm_paddr_t pa);
void pmap_kenter_attr(vm_offset_t va, vm_paddr_t pa, vm_memattr_t attr);
+void pmap_kenter_device(vm_offset_t, vm_size_t, vm_paddr_t);
void pmap_kremove(vm_offset_t va);
+void pmap_kremove_device(vm_offset_t, vm_size_t);
void *pmap_kenter_temporary(vm_paddr_t pa, int i);
void pmap_kenter_temporary_free(vm_paddr_t pa);
void pmap_flush_pvcache(vm_page_t m);
Modified: head/sys/mips/mips/pmap.c
==============================================================================
--- head/sys/mips/mips/pmap.c Thu May 16 19:09:41 2019 (r347887)
+++ head/sys/mips/mips/pmap.c Thu May 16 19:10:48 2019 (r347888)
@@ -854,6 +854,44 @@ pmap_kenter(vm_offset_t va, vm_paddr_t pa)
pmap_kenter_attr(va, pa, VM_MEMATTR_DEFAULT);
}
+void
+pmap_kenter_device(vm_offset_t va, vm_size_t size, vm_paddr_t pa)
+{
+
+ KASSERT((size & PAGE_MASK) == 0,
+ ("%s: device mapping not page-sized", __func__));
+
+ for (; size > 0; size -= PAGE_SIZE) {
+ /*
+ * XXXCEM: this is somewhat inefficient on SMP systems in that
+ * every single page is individually TLB-invalidated via
+ * rendezvous (pmap_update_page()), instead of invalidating the
+ * entire range via a single rendezvous.
+ */
+ pmap_kenter_attr(va, pa, VM_MEMATTR_UNCACHEABLE);
+ va += PAGE_SIZE;
+ pa += PAGE_SIZE;
+ }
+}
+
+void
+pmap_kremove_device(vm_offset_t va, vm_size_t size)
+{
+
+ KASSERT((size & PAGE_MASK) == 0,
+ ("%s: device mapping not page-sized", __func__));
+
+ /*
+ * XXXCEM: Similar to pmap_kenter_device, this is inefficient on SMP,
+ * in that pages are invalidated individually instead of a single range
+ * rendezvous.
+ */
+ for (; size > 0; size -= PAGE_SIZE) {
+ pmap_kremove(va);
+ va += PAGE_SIZE;
+ }
+}
+
/*
* remove a page from the kernel pagetables
*/
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