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authorThomas Hellstrom <thomas-at-tungstengraphics-dot-com>2008-02-28 13:47:15 +0100
committerThomas Hellstrom <thomas-at-tungstengraphics-dot-com>2008-02-28 14:06:46 +0100
commit8ef838e5ff7b3c005d7fbc725e17bcccd0e1e1eb (patch)
tree7c772349e4cd4a3196221a7aeee705b8238b58d6
parentfd595fa4dc6f788a8a1e1b56178e15f411706cb9 (diff)
Add a compat kmap_atomic_prot_pfn to do quick kernel map / unmaps of
PCI- or high memory. This is substantially more efficient than drm_bo_kmap, since the mapping only lives on a single processor. Unmapping is done use kunmap_atomic(). Flushes only a single tlb() entry. Add a support utility int drm_bo_pfn_prot() that returns the pfn and desired page protection for a given bo offset. This is all intended for relocations in bound TTMS or vram. Mapping-accessing-unmapping must be atomic, either using preempt_xx() macros or a spinlock.
-rw-r--r--linux-core/drm_bo_move.c33
-rw-r--r--linux-core/drm_compat.c32
-rw-r--r--linux-core/drm_compat.h5
-rw-r--r--linux-core/drm_objects.h4
4 files changed, 74 insertions, 0 deletions
diff --git a/linux-core/drm_bo_move.c b/linux-core/drm_bo_move.c
index b06a09f0..30e0f43f 100644
--- a/linux-core/drm_bo_move.c
+++ b/linux-core/drm_bo_move.c
@@ -595,3 +595,36 @@ void drm_bo_kunmap(struct drm_bo_kmap_obj *map)
map->page = NULL;
}
EXPORT_SYMBOL(drm_bo_kunmap);
+
+int drm_bo_pfn_prot(struct drm_buffer_object *bo,
+ unsigned long dst_offset,
+ unsigned long *pfn,
+ pgprot_t *prot)
+{
+ struct drm_bo_mem_reg *mem = &bo->mem;
+ struct drm_device *dev = bo->dev;
+ unsigned long bus_offset;
+ unsigned long bus_size;
+ unsigned long bus_base;
+ struct drm_mem_type_manager *man = &dev->bm.man[mem->mem_type];
+ int ret;
+
+ ret = drm_bo_pci_offset(dev, mem, &bus_base, &bus_offset,
+ &bus_size);
+ if (ret)
+ return -EINVAL;
+
+ if (bus_size != 0)
+ *pfn = (bus_base + bus_offset + dst_offset) >> PAGE_SHIFT;
+ else if (!bo->ttm)
+ return -EINVAL;
+ else
+ *pfn = page_to_pfn(drm_ttm_get_page(bo->ttm, dst_offset >> PAGE_SHIFT));
+
+ *prot = (mem->flags & DRM_BO_FLAG_CACHED) ?
+ PAGE_KERNEL : drm_kernel_io_prot(man->drm_bus_maptype);
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_bo_pfn_prot);
+
diff --git a/linux-core/drm_compat.c b/linux-core/drm_compat.c
index a745a7d9..32e43a0a 100644
--- a/linux-core/drm_compat.c
+++ b/linux-core/drm_compat.c
@@ -729,3 +729,35 @@ void *idr_replace(struct idr *idp, void *ptr, int id)
}
EXPORT_SYMBOL(idr_replace);
#endif
+
+#if defined(CONFIG_X86)
+
+#define drm_kmap_get_fixmap_pte(vaddr) \
+ pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), vaddr), (vaddr)), (vaddr))
+
+void *kmap_atomic_prot_pfn(unsigned long pfn, enum km_type type,
+ pgprot_t protection)
+{
+ enum fixed_addresses idx;
+ unsigned long vaddr;
+ static pte_t *km_pte;
+ static int initialized = 0;
+
+ if (unlikely(!initialized)) {
+ km_pte = drm_kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN));
+ initialized = 1;
+ }
+
+ pagefault_disable();
+ idx = type + KM_TYPE_NR*smp_processor_id();
+ vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
+ set_pte(km_pte-idx, pfn_pte(pfn, protection));
+
+ return (void*) vaddr;
+}
+
+EXPORT_SYMBOL(kmap_atomic_prot_pfn);
+
+#endif
+
+
diff --git a/linux-core/drm_compat.h b/linux-core/drm_compat.h
index f8933e0c..39027cf4 100644
--- a/linux-core/drm_compat.h
+++ b/linux-core/drm_compat.h
@@ -328,4 +328,9 @@ void *idr_replace(struct idr *idp, void *ptr, int id);
typedef _Bool bool;
#endif
+#if defined(CONFIG_X86)
+#define DRM_KMAP_ATOMIC_PROT_PFN
+extern void *kmap_atomic_prot_pfn(unsigned long pfn, enum km_type type,
+ pgprot_t protection);
+#endif
#endif
diff --git a/linux-core/drm_objects.h b/linux-core/drm_objects.h
index e43e8dfd..8055afe1 100644
--- a/linux-core/drm_objects.h
+++ b/linux-core/drm_objects.h
@@ -738,6 +738,10 @@ static inline void *drm_bmo_virtual(struct drm_bo_kmap_obj *map, int *is_iomem)
extern void drm_bo_kunmap(struct drm_bo_kmap_obj *map);
extern int drm_bo_kmap(struct drm_buffer_object *bo, unsigned long start_page,
unsigned long num_pages, struct drm_bo_kmap_obj *map);
+extern int drm_bo_pfn_prot(struct drm_buffer_object *bo,
+ unsigned long dst_offset,
+ unsigned long *pfn,
+ pgprot_t *prot);
/*