From 836cf0465c422ee6d654060edd7c620d9cf0c09c Mon Sep 17 00:00:00 2001 From: Dave Airlie Date: Sun, 10 Jul 2005 19:27:04 +1000 Subject: drm: cleanup buffer/map code This is a patch from DRM CVS that cleans up some code that was in CVS that I never moved to the kernel, this patch produces the result of the cleanups and puts it into the kernel drm. From: Eric Anholt , Jon Smirl, Dave Airlie Signed-off-by: Dave Airlie --- drivers/char/drm/drm_bufs.c | 229 ++++++++++++++++++++++++++++++-------------- 1 file changed, 159 insertions(+), 70 deletions(-) (limited to 'drivers/char/drm/drm_bufs.c') diff --git a/drivers/char/drm/drm_bufs.c b/drivers/char/drm/drm_bufs.c index 06b01215fdf..fcc8d244f46 100644 --- a/drivers/char/drm/drm_bufs.c +++ b/drivers/char/drm/drm_bufs.c @@ -36,29 +36,33 @@ #include #include "drmP.h" -/** - * Compute size order. Returns the exponent of the smaller power of two which - * is greater or equal to given number. - * - * \param size size. - * \return order. - * - * \todo Can be made faster. - */ -int drm_order( unsigned long size ) +unsigned long drm_get_resource_start(drm_device_t *dev, unsigned int resource) { - int order; - unsigned long tmp; + return pci_resource_start(dev->pdev, resource); +} +EXPORT_SYMBOL(drm_get_resource_start); - for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) - ; +unsigned long drm_get_resource_len(drm_device_t *dev, unsigned int resource) +{ + return pci_resource_len(dev->pdev, resource); +} +EXPORT_SYMBOL(drm_get_resource_len); - if (size & (size - 1)) - ++order; +static drm_local_map_t *drm_find_matching_map(drm_device_t *dev, + drm_local_map_t *map) +{ + struct list_head *list; - return order; + list_for_each(list, &dev->maplist->head) { + drm_map_list_t *entry = list_entry(list, drm_map_list_t, head); + if (entry->map && map->type == entry->map->type && + entry->map->offset == map->offset) { + return entry->map; + } + } + + return NULL; } -EXPORT_SYMBOL(drm_order); #ifdef CONFIG_COMPAT /* @@ -89,6 +93,7 @@ int drm_addmap(drm_device_t * dev, unsigned int offset, drm_map_t *map; drm_map_list_t *list; drm_dma_handle_t *dmah; + drm_local_map_t *found_map; map = drm_alloc( sizeof(*map), DRM_MEM_MAPS ); if ( !map ) @@ -129,6 +134,24 @@ int drm_addmap(drm_device_t * dev, unsigned int offset, #ifdef __alpha__ map->offset += dev->hose->mem_space->start; #endif + /* Some drivers preinitialize some maps, without the X Server + * needing to be aware of it. Therefore, we just return success + * when the server tries to create a duplicate map. + */ + found_map = drm_find_matching_map(dev, map); + if (found_map != NULL) { + if (found_map->size != map->size) { + DRM_DEBUG("Matching maps of type %d with " + "mismatched sizes, (%ld vs %ld)\n", + map->type, map->size, found_map->size); + found_map->size = map->size; + } + + drm_free(map, sizeof(*map), DRM_MEM_MAPS); + *map_ptr = found_map; + return 0; + } + if (drm_core_has_MTRR(dev)) { if ( map->type == _DRM_FRAME_BUFFER || (map->flags & _DRM_WRITE_COMBINING) ) { @@ -270,93 +293,136 @@ int drm_addmap_ioctl(struct inode *inode, struct file *filp, * * \sa drm_addmap */ -int drm_rmmap(drm_device_t *dev, void *handle) +int drm_rmmap_locked(drm_device_t *dev, drm_local_map_t *map) { struct list_head *list; drm_map_list_t *r_list = NULL; - drm_vma_entry_t *pt, *prev; - drm_map_t *map; - int found_maps = 0; + drm_dma_handle_t dmah; - down(&dev->struct_sem); - list = &dev->maplist->head; + /* Find the list entry for the map and remove it */ list_for_each(list, &dev->maplist->head) { r_list = list_entry(list, drm_map_list_t, head); - if(r_list->map && - r_list->map->handle == handle && - r_list->map->flags & _DRM_REMOVABLE) break; + if (r_list->map == map) { + list_del(list); + drm_free(list, sizeof(*list), DRM_MEM_MAPS); + break; + } } - /* List has wrapped around to the head pointer, or its empty we didn't - * find anything. + /* List has wrapped around to the head pointer, or it's empty and we + * didn't find anything. */ - if(list == (&dev->maplist->head)) { - up(&dev->struct_sem); + if (list == (&dev->maplist->head)) { return -EINVAL; } - map = r_list->map; - list_del(list); - drm_free(list, sizeof(*list), DRM_MEM_MAPS); - - for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) { - if (pt->vma->vm_private_data == map) found_maps++; - } - if(!found_maps) { - drm_dma_handle_t dmah; - - switch (map->type) { - case _DRM_REGISTERS: - case _DRM_FRAME_BUFFER: - if (drm_core_has_MTRR(dev)) { - if (map->mtrr >= 0) { - int retcode; - retcode = mtrr_del(map->mtrr, - map->offset, - map->size); - DRM_DEBUG("mtrr_del = %d\n", retcode); - } - } - drm_ioremapfree(map->handle, map->size, dev); - break; - case _DRM_SHM: - vfree(map->handle); - break; - case _DRM_AGP: - case _DRM_SCATTER_GATHER: - break; - case _DRM_CONSISTENT: - dmah.vaddr = map->handle; - dmah.busaddr = map->offset; - dmah.size = map->size; - __drm_pci_free(dev, &dmah); - break; + switch (map->type) { + case _DRM_REGISTERS: + drm_ioremapfree(map->handle, map->size, dev); + /* FALLTHROUGH */ + case _DRM_FRAME_BUFFER: + if (drm_core_has_MTRR(dev) && map->mtrr >= 0) { + int retcode; + retcode = mtrr_del(map->mtrr, map->offset, + map->size); + DRM_DEBUG ("mtrr_del=%d\n", retcode); } - drm_free(map, sizeof(*map), DRM_MEM_MAPS); + break; + case _DRM_SHM: + vfree(map->handle); + break; + case _DRM_AGP: + case _DRM_SCATTER_GATHER: + break; + case _DRM_CONSISTENT: + dmah.vaddr = map->handle; + dmah.busaddr = map->offset; + dmah.size = map->size; + __drm_pci_free(dev, &dmah); + break; } - up(&dev->struct_sem); + drm_free(map, sizeof(*map), DRM_MEM_MAPS); + return 0; } +EXPORT_SYMBOL(drm_rmmap_locked); + +int drm_rmmap(drm_device_t *dev, drm_local_map_t *map) +{ + int ret; + + down(&dev->struct_sem); + ret = drm_rmmap_locked(dev, map); + up(&dev->struct_sem); + + return ret; +} EXPORT_SYMBOL(drm_rmmap); +/* The rmmap ioctl appears to be unnecessary. All mappings are torn down on + * the last close of the device, and this is necessary for cleanup when things + * exit uncleanly. Therefore, having userland manually remove mappings seems + * like a pointless exercise since they're going away anyway. + * + * One use case might be after addmap is allowed for normal users for SHM and + * gets used by drivers that the server doesn't need to care about. This seems + * unlikely. + */ int drm_rmmap_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) { drm_file_t *priv = filp->private_data; drm_device_t *dev = priv->head->dev; drm_map_t request; + drm_local_map_t *map = NULL; + struct list_head *list; + int ret; if (copy_from_user(&request, (drm_map_t __user *)arg, sizeof(request))) { return -EFAULT; } - return drm_rmmap(dev, request.handle); + down(&dev->struct_sem); + list_for_each(list, &dev->maplist->head) { + drm_map_list_t *r_list = list_entry(list, drm_map_list_t, head); + + if (r_list->map && + r_list->map->handle == request.handle && + r_list->map->flags & _DRM_REMOVABLE) { + map = r_list->map; + break; + } + } + + /* List has wrapped around to the head pointer, or its empty we didn't + * find anything. + */ + if (list == (&dev->maplist->head)) { + up(&dev->struct_sem); + return -EINVAL; + } + + if (!map) + return -EINVAL; + + /* Register and framebuffer maps are permanent */ + if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) { + up(&dev->struct_sem); + return 0; + } + + ret = drm_rmmap_locked(dev, map); + + up(&dev->struct_sem); + + return ret; } /** * Cleanup after an error on one of the addbufs() functions. * + * \param dev DRM device. * \param entry buffer entry where the error occurred. * * Frees any pages and buffers associated with the given entry. @@ -1470,3 +1536,26 @@ int drm_mapbufs( struct inode *inode, struct file *filp, return retcode; } +/** + * Compute size order. Returns the exponent of the smaller power of two which + * is greater or equal to given number. + * + * \param size size. + * \return order. + * + * \todo Can be made faster. + */ +int drm_order( unsigned long size ) +{ + int order; + unsigned long tmp; + + for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) + ; + + if (size & (size - 1)) + ++order; + + return order; +} +EXPORT_SYMBOL(drm_order); -- cgit v1.2.3