diff options
Diffstat (limited to 'bsd/mga/mga_context.c')
| -rw-r--r-- | bsd/mga/mga_context.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/bsd/mga/mga_context.c b/bsd/mga/mga_context.c new file mode 100644 index 00000000..63f1b42b --- /dev/null +++ b/bsd/mga/mga_context.c @@ -0,0 +1,196 @@ +/* mga_context.c -- IOCTLs for mga contexts + * Created: Mon Dec 13 09:51:35 1999 by faith@precisioninsight.com + * + * Copyright 1999 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 + * PRECISION INSIGHT 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. + * + * Author: Rickard E. (Rik) Faith <faith@valinux.com> + * Jeff Hartmann <jhartmann@valinux.com> + * + */ + +#define __NO_VERSION__ +#include "drmP.h" +#include "mga_drv.h" + +static int mga_alloc_queue(drm_device_t *dev) +{ + int temp = drm_ctxbitmap_next(dev); + DRM_DEBUG("mga_alloc_queue: %d\n", temp); + return temp; +} + +int mga_context_switch(drm_device_t *dev, int old, int new) +{ + char buf[64]; + + atomic_inc(&dev->total_ctx); + + if (test_and_set_bit(0, &dev->context_flag)) { + DRM_ERROR("Reentering -- FIXME\n"); + return EBUSY; + } + +#if DRM_DMA_HISTOGRAM + getnanotime(&dev->ctx_start); +#endif + + DRM_DEBUG("Context switch from %d to %d\n", old, new); + + if (new == dev->last_context) { + clear_bit(0, &dev->context_flag); + return 0; + } + + if (drm_flags & DRM_FLAG_NOCTX) { + mga_context_switch_complete(dev, new); + } else { + sprintf(buf, "C %d %d\n", old, new); + drm_write_string(dev, buf); + } + + return 0; +} + +int mga_context_switch_complete(drm_device_t *dev, int new) +{ + dev->last_context = new; /* PRE/POST: This is the _only_ writer. */ + dev->last_switch = ticks; + + 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. */ +#if DRM_DMA_HISTOGRAM + { + struct timespec ts; + getnanotime(&ts); + timespecsub(&ts, &dev->lck_start); + atomic_inc(&dev->histo.ctx[drm_histogram_slot(&ts)]); + } +#endif + clear_bit(0, &dev->context_flag); + wakeup(&dev->context_wait); + + return 0; +} + +int +mga_resctx(dev_t kdev, u_long cmd, caddr_t data, int flags, struct proc *p) +{ + drm_ctx_res_t res; + drm_ctx_t ctx; + int i, error; + + DRM_DEBUG("%d\n", DRM_RESERVED_CONTEXTS); + res = *(drm_ctx_res_t *) data; + if (res.count >= DRM_RESERVED_CONTEXTS) { + memset(&ctx, 0, sizeof(ctx)); + for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) { + ctx.handle = i; + error = copyout(&i, &res.contexts[i], sizeof(i)); + if (error) return error; + } + } + res.count = DRM_RESERVED_CONTEXTS; + *(drm_ctx_res_t *) data = res; + return 0; +} + +int +mga_addctx(dev_t kdev, u_long cmd, caddr_t data, int flags, struct proc *p) +{ + drm_device_t *dev = kdev->si_drv1; + drm_ctx_t ctx; + + ctx = *(drm_ctx_t *) data; + if ((ctx.handle = mga_alloc_queue(dev)) == DRM_KERNEL_CONTEXT) { + /* Skip kernel's context and get a new one. */ + ctx.handle = mga_alloc_queue(dev); + } + if (ctx.handle == -1) { + DRM_DEBUG("Not enough free contexts.\n"); + /* Should this return EBUSY instead? */ + return ENOMEM; + } + DRM_DEBUG("%d\n", ctx.handle); + *(drm_ctx_t *) data = ctx; + return 0; +} + +int +mga_modctx(dev_t kdev, u_long cmd, caddr_t data, int flags, struct proc *p) +{ + /* This does nothing for the mga */ + return 0; +} + +int mga_getctx(dev_t kdev, u_long cmd, caddr_t data, int flags, struct proc *p) +{ + drm_ctx_t ctx; + + ctx = *(drm_ctx_t *) data; + /* This is 0, because we don't hanlde any context flags */ + ctx.flags = 0; + *(drm_ctx_t *) data = ctx; + return 0; +} + +int mga_switchctx(dev_t kdev, u_long cmd, caddr_t data, int flags, struct proc *p) +{ + drm_device_t *dev = kdev->si_drv1; + drm_ctx_t ctx; + + ctx = *(drm_ctx_t *) data; + DRM_DEBUG("%d\n", ctx.handle); + return mga_context_switch(dev, dev->last_context, ctx.handle); +} + +int mga_newctx(dev_t kdev, u_long cmd, caddr_t data, int flags, struct proc *p) +{ + drm_device_t *dev = kdev->si_drv1; + drm_ctx_t ctx; + + ctx = *(drm_ctx_t *) data; + DRM_DEBUG("%d\n", ctx.handle); + mga_context_switch_complete(dev, ctx.handle); + + return 0; +} + +int mga_rmctx(dev_t kdev, u_long cmd, caddr_t data, int flags, struct proc *p) +{ + drm_device_t *dev = kdev->si_drv1; + drm_ctx_t ctx; + + ctx = *(drm_ctx_t *) data; + DRM_DEBUG("%d\n", ctx.handle); + if(ctx.handle != DRM_KERNEL_CONTEXT) { + drm_ctxbitmap_free(dev, ctx.handle); + } + + return 0; +} |