renesas/drm.git - libdrm, cloned from git://anongit.freedesktop.org/mesa/drm

Age	Commit message (Expand)	Author
2010-01-08	tests: Add a very small libkms test	Jakob Bornecrantz

/*- * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Authors: * Rickard E. (Rik) Faith <faith@valinux.com> * Gareth Hughes <gareth@valinux.com> * */ /** @file drm_context.c * Implementation of the context management ioctls. */ #include "drmP.h" /* ================================================================ * Context bitmap support */ void drm_ctxbitmap_free(struct drm_device *dev, int ctx_handle) { if (ctx_handle < 0 || ctx_handle >= DRM_MAX_CTXBITMAP || dev->ctx_bitmap == NULL) { DRM_ERROR("Attempt to free invalid context handle: %d\n", ctx_handle); return; } DRM_LOCK(); clear_bit(ctx_handle, dev->ctx_bitmap); dev->context_sareas[ctx_handle] = NULL; DRM_UNLOCK(); return; } int drm_ctxbitmap_next(struct drm_device *dev) { int bit; if (dev->ctx_bitmap == NULL) return -1; DRM_LOCK(); bit = find_first_zero_bit(dev->ctx_bitmap, DRM_MAX_CTXBITMAP); if (bit >= DRM_MAX_CTXBITMAP) { DRM_UNLOCK(); return -1; } 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 != NULL) { drm_local_map_t **ctx_sareas; ctx_sareas = realloc(dev->context_sareas, dev->max_context * sizeof(*dev->context_sareas), DRM_MEM_SAREA, M_NOWAIT); if (ctx_sareas == NULL) { clear_bit(bit, dev->ctx_bitmap); DRM_UNLOCK(); return -1; } dev->context_sareas = ctx_sareas; dev->context_sareas[bit] = NULL; } else { /* max_context == 1 at this point */ dev->context_sareas = malloc(dev->max_context * sizeof(*dev->context_sareas), DRM_MEM_SAREA, M_NOWAIT); if (dev->context_sareas == NULL) { clear_bit(bit, dev->ctx_bitmap); DRM_UNLOCK(); return -1; } dev->context_sareas[bit] = NULL; } } DRM_UNLOCK(); return bit; } int drm_ctxbitmap_init(struct drm_device *dev) { int i; int temp; DRM_LOCK(); dev->ctx_bitmap = malloc(PAGE_SIZE, DRM_MEM_CTXBITMAP, M_NOWAIT | M_ZERO); if (dev->ctx_bitmap == NULL) { DRM_UNLOCK(); return ENOMEM; } dev->context_sareas = NULL; dev->max_context = -1; DRM_UNLOCK(); for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) { temp = drm_ctxbitmap_next(dev); DRM_DEBUG("drm_ctxbitmap_init : %d\n", temp); } return 0; } void drm_ctxbitmap_cleanup(struct drm_device *dev) { DRM_LOCK(); if (dev->context_sareas != NULL) free(dev->context_sareas, DRM_MEM_SAREA); free(dev->ctx_bitmap, DRM_MEM_CTXBITMAP); DRM_UNLOCK(); } /* ================================================================ * Per Context SAREA Support */ int drm_getsareactx(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_ctx_priv_map *request = data; drm_local_map_t *map; DRM_LOCK(); if (dev->max_context < 0 || request->ctx_id >= (unsigned) dev->max_context) { DRM_UNLOCK(); return EINVAL; } map = dev->context_sareas[request->ctx_id]; DRM_UNLOCK(); request->handle = map->handle; return 0; } int drm_setsareactx(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_ctx_priv_map *request = data; drm_local_map_t *map = NULL; DRM_LOCK(); TAILQ_FOREACH(map, &dev->maplist, link) { if (map->handle == request->handle) { if (dev->max_context < 0) goto bad; if (request->ctx_id >= (unsigned) dev->max_context) goto bad; dev->context_sareas[request->ctx_id] = map; DRM_UNLOCK(); return 0; } } bad: DRM_UNLOCK(); return EINVAL; } /* ================================================================ * The actual DRM context handling routines */ int drm_context_switch(struct drm_device *dev, int old, int new) { if (test_and_set_bit(0, &dev->context_flag)) { DRM_ERROR("Reentering -- FIXME\n"); return EBUSY; } DRM_DEBUG("Context switch from %d to %d\n", old, new); if (new == dev->last_context) { clear_bit(0, &dev->context_flag); return 0; } return 0; } int drm_context_switch_complete(struct drm_device *dev, int new) { dev->last_context = new; /* PRE/POST: This is the _only_ writer. */ if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) { DRM_ERROR("Lock isn't held after context switch\n"); } /* If a context switch is ever initiated when the kernel holds the lock, release that lock here. */ clear_bit(0, &dev->context_flag); return 0; } int drm_resctx(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_ctx_res *res = data; struct drm_ctx ctx; int i; if (res->count >= DRM_RESERVED_CONTEXTS) { bzero(&ctx, sizeof(ctx)); for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) { ctx.handle = i; if (DRM_COPY_TO_USER(&res->contexts[i], &ctx, sizeof(ctx))) return EFAULT; } } res->count = DRM_RESERVED_CONTEXTS; return 0; } int drm_addctx(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_ctx *ctx = data; ctx->handle = drm_ctxbitmap_next(dev); if (ctx->handle == DRM_KERNEL_CONTEXT) { /* Skip kernel's context and get a new one. */ ctx->handle = drm_ctxbitmap_next(dev); } DRM_DEBUG("%d\n", ctx->handle); if (ctx->handle == -1) { DRM_DEBUG("Not enough free contexts.\n"); /* Should this return -EBUSY instead? */ return ENOMEM; } if (dev->driver->context_ctor && ctx->handle != DRM_KERNEL_CONTEXT) { DRM_LOCK(); dev->driver->context_ctor(dev, ctx->handle); DRM_UNLOCK(); } return 0; } int drm_modctx(struct drm_device *dev, void *data, struct drm_file *file_priv) { /* This does nothing */ return 0; } int drm_getctx(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_ctx *ctx = data; /* This is 0, because we don't handle any context flags */ ctx->flags = 0; return 0; } int drm_switchctx(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_ctx *ctx = data; DRM_DEBUG("%d\n", ctx->handle); return drm_context_switch(dev, dev->last_context, ctx->handle); } int drm_newctx(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_ctx *ctx = data; DRM_DEBUG("%d\n", ctx->handle); drm_context_switch_complete(dev, ctx->handle); return 0; } int drm_rmctx(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_ctx *ctx = data; DRM_DEBUG("%d\n", ctx->handle); if (ctx->handle != DRM_KERNEL_CONTEXT) { if (dev->driver->context_dtor) { DRM_LOCK(); dev->driver->context_dtor(dev, ctx->handle); DRM_UNLOCK(); } drm_ctxbitmap_free(dev, ctx->handle); } return 0; }