From 62968144e673016180f530fdfe170874b80ab5a7 Mon Sep 17 00:00:00 2001 From: Dave Airlie Date: Tue, 17 Jul 2007 10:46:52 +1000 Subject: [PATCH] drm: convert drm context code to use Linux idr This converts the drm context allocator to an idr, using the new idr interface features from Kristian. Fixes from Kristian Hoegsberg Signed-off-by: Dave Airlie --- drivers/char/drm/drmP.h | 5 +- drivers/char/drm/drm_context.c | 131 ++++++++------------------------- 2 files changed, 33 insertions(+), 103 deletions(-) diff --git a/drivers/char/drm/drmP.h b/drivers/char/drm/drmP.h index 1277693e9ca..b1cafe36611 100644 --- a/drivers/char/drm/drmP.h +++ b/drivers/char/drm/drmP.h @@ -75,6 +75,8 @@ #include #include "drm.h" +#include + #define __OS_HAS_AGP (defined(CONFIG_AGP) || (defined(CONFIG_AGP_MODULE) && defined(MODULE))) #define __OS_HAS_MTRR (defined(CONFIG_MTRR)) @@ -676,8 +678,7 @@ struct drm_device { int ctx_count; /**< Number of context handles */ struct mutex ctxlist_mutex; /**< For ctxlist */ - struct drm_map **context_sareas; /**< per-context SAREA's */ - int max_context; + struct idr ctx_idr; struct list_head vmalist; /**< List of vmas (for debugging) */ struct drm_lock_data lock; /**< Information on hardware lock */ diff --git a/drivers/char/drm/drm_context.c b/drivers/char/drm/drm_context.c index 7fc055adec2..61ad986baa8 100644 --- a/drivers/char/drm/drm_context.c +++ b/drivers/char/drm/drm_context.c @@ -53,26 +53,14 @@ * \param ctx_handle context handle. * * Clears the bit specified by \p ctx_handle in drm_device::ctx_bitmap and the entry - * in drm_device::context_sareas, while holding the drm_device::struct_mutex + * in drm_device::ctx_idr, while holding the drm_device::struct_mutex * lock. */ void drm_ctxbitmap_free(struct drm_device * dev, int ctx_handle) { - if (ctx_handle < 0) - goto failed; - if (!dev->ctx_bitmap) - goto failed; - - if (ctx_handle < DRM_MAX_CTXBITMAP) { - mutex_lock(&dev->struct_mutex); - clear_bit(ctx_handle, dev->ctx_bitmap); - dev->context_sareas[ctx_handle] = NULL; - mutex_unlock(&dev->struct_mutex); - return; - } - failed: - DRM_ERROR("Attempt to free invalid context handle: %d\n", ctx_handle); - return; + mutex_lock(&dev->struct_mutex); + idr_remove(&dev->ctx_idr, ctx_handle); + mutex_unlock(&dev->struct_mutex); } /** @@ -81,62 +69,28 @@ void drm_ctxbitmap_free(struct drm_device * dev, int ctx_handle) * \param dev DRM device. * \return (non-negative) context handle on success or a negative number on failure. * - * Find the first zero bit in drm_device::ctx_bitmap and (re)allocates - * drm_device::context_sareas to accommodate the new entry while holding the + * Allocate a new idr from drm_device::ctx_idr while holding the * drm_device::struct_mutex lock. */ static int drm_ctxbitmap_next(struct drm_device * dev) { - int bit; - - if (!dev->ctx_bitmap) - return -1; + int new_id; + int ret; +again: + if (idr_pre_get(&dev->ctx_idr, GFP_KERNEL) == 0) { + DRM_ERROR("Out of memory expanding drawable idr\n"); + return -ENOMEM; + } mutex_lock(&dev->struct_mutex); - bit = find_first_zero_bit(dev->ctx_bitmap, DRM_MAX_CTXBITMAP); - if (bit < DRM_MAX_CTXBITMAP) { - set_bit(bit, dev->ctx_bitmap); - DRM_DEBUG("drm_ctxbitmap_next bit : %d\n", bit); - if ((bit + 1) > dev->max_context) { - dev->max_context = (bit + 1); - if (dev->context_sareas) { - struct drm_map **ctx_sareas; - - ctx_sareas = drm_realloc(dev->context_sareas, - (dev->max_context - - 1) * - sizeof(*dev-> - context_sareas), - dev->max_context * - sizeof(*dev-> - context_sareas), - DRM_MEM_MAPS); - if (!ctx_sareas) { - clear_bit(bit, dev->ctx_bitmap); - mutex_unlock(&dev->struct_mutex); - return -1; - } - dev->context_sareas = ctx_sareas; - dev->context_sareas[bit] = NULL; - } else { - /* max_context == 1 at this point */ - dev->context_sareas = - drm_alloc(dev->max_context * - sizeof(*dev->context_sareas), - DRM_MEM_MAPS); - if (!dev->context_sareas) { - clear_bit(bit, dev->ctx_bitmap); - mutex_unlock(&dev->struct_mutex); - return -1; - } - dev->context_sareas[bit] = NULL; - } - } + ret = idr_get_new_above(&dev->ctx_idr, NULL, + DRM_RESERVED_CONTEXTS, &new_id); + if (ret == -EAGAIN) { mutex_unlock(&dev->struct_mutex); - return bit; + goto again; } mutex_unlock(&dev->struct_mutex); - return -1; + return new_id; } /** @@ -144,31 +98,11 @@ static int drm_ctxbitmap_next(struct drm_device * dev) * * \param dev DRM device. * - * Allocates and initialize drm_device::ctx_bitmap and drm_device::context_sareas, while holding - * the drm_device::struct_mutex lock. + * Initialise the drm_device::ctx_idr */ int drm_ctxbitmap_init(struct drm_device * dev) { - int i; - int temp; - - mutex_lock(&dev->struct_mutex); - dev->ctx_bitmap = (unsigned long *)drm_alloc(PAGE_SIZE, - DRM_MEM_CTXBITMAP); - if (dev->ctx_bitmap == NULL) { - mutex_unlock(&dev->struct_mutex); - return -ENOMEM; - } - memset((void *)dev->ctx_bitmap, 0, PAGE_SIZE); - dev->context_sareas = NULL; - dev->max_context = -1; - mutex_unlock(&dev->struct_mutex); - - for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) { - temp = drm_ctxbitmap_next(dev); - DRM_DEBUG("drm_ctxbitmap_init : %d\n", temp); - } - + idr_init(&dev->ctx_idr); return 0; } @@ -177,17 +111,13 @@ int drm_ctxbitmap_init(struct drm_device * dev) * * \param dev DRM device. * - * Frees drm_device::ctx_bitmap and drm_device::context_sareas, while holding - * the drm_device::struct_mutex lock. + * Free all idr members using drm_ctx_sarea_free helper function + * while holding the drm_device::struct_mutex lock. */ void drm_ctxbitmap_cleanup(struct drm_device * dev) { mutex_lock(&dev->struct_mutex); - if (dev->context_sareas) - drm_free(dev->context_sareas, - sizeof(*dev->context_sareas) * - dev->max_context, DRM_MEM_MAPS); - drm_free((void *)dev->ctx_bitmap, PAGE_SIZE, DRM_MEM_CTXBITMAP); + idr_remove_all(&dev->ctx_idr); mutex_unlock(&dev->struct_mutex); } @@ -206,7 +136,7 @@ void drm_ctxbitmap_cleanup(struct drm_device * dev) * \param arg user argument pointing to a drm_ctx_priv_map structure. * \return zero on success or a negative number on failure. * - * Gets the map from drm_device::context_sareas with the handle specified and + * Gets the map from drm_device::ctx_idr with the handle specified and * returns its handle. */ int drm_getsareactx(struct inode *inode, struct file *filp, @@ -223,13 +153,13 @@ int drm_getsareactx(struct inode *inode, struct file *filp, return -EFAULT; mutex_lock(&dev->struct_mutex); - if (dev->max_context < 0 - || request.ctx_id >= (unsigned)dev->max_context) { + + map = idr_find(&dev->ctx_idr, request.ctx_id); + if (!map) { mutex_unlock(&dev->struct_mutex); return -EINVAL; } - map = dev->context_sareas[request.ctx_id]; mutex_unlock(&dev->struct_mutex); request.handle = NULL; @@ -258,7 +188,7 @@ int drm_getsareactx(struct inode *inode, struct file *filp, * \return zero on success or a negative number on failure. * * Searches the mapping specified in \p arg and update the entry in - * drm_device::context_sareas with it. + * drm_device::ctx_idr with it. */ int drm_setsareactx(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) @@ -288,11 +218,10 @@ int drm_setsareactx(struct inode *inode, struct file *filp, map = r_list->map; if (!map) goto bad; - if (dev->max_context < 0) - goto bad; - if (request.ctx_id >= (unsigned)dev->max_context) + + if (IS_ERR(idr_replace(&dev->ctx_idr, map, request.ctx_id))) goto bad; - dev->context_sareas[request.ctx_id] = map; + mutex_unlock(&dev->struct_mutex); return 0; } -- 2.41.0