diff options
Diffstat (limited to 'drivers/gpu/drm/vmwgfx/vmwgfx_vkms.c')
| -rw-r--r-- | drivers/gpu/drm/vmwgfx/vmwgfx_vkms.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_vkms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_vkms.c new file mode 100644 index 000000000000..ff76bfd70f91 --- /dev/null +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_vkms.c @@ -0,0 +1,193 @@ +// SPDX-License-Identifier: GPL-2.0 OR MIT +/************************************************************************** + * + * Copyright (c) 2024 Broadcom. All Rights Reserved. The term + * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries. + * + * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDERS, AUTHORS 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. + * + **************************************************************************/ + +#include "vmwgfx_vkms.h" + +#include "vmwgfx_drv.h" +#include "vmwgfx_kms.h" +#include "vmwgfx_vkms.h" + +#include <drm/drm_crtc.h> +#include <drm/drm_print.h> +#include <drm/drm_vblank.h> + +#define GUESTINFO_VBLANK "guestinfo.vmwgfx.vkms_enable" + +enum hrtimer_restart +vmw_vkms_vblank_simulate(struct hrtimer *timer) +{ + struct vmw_display_unit *du = container_of(timer, struct vmw_display_unit, vkms.timer); + struct drm_crtc *crtc = &du->crtc; + u64 ret_overrun; + bool ret; + + ret_overrun = hrtimer_forward_now(&du->vkms.timer, + du->vkms.period_ns); + if (ret_overrun != 1) + DRM_WARN("%s: vblank timer overrun\n", __func__); + + ret = drm_crtc_handle_vblank(crtc); + /* Don't queue timer again when vblank is disabled. */ + if (!ret) + return HRTIMER_NORESTART; + + return HRTIMER_RESTART; +} + +void +vmw_vkms_init(struct vmw_private *vmw) +{ + char buffer[64]; + const size_t max_buf_len = sizeof(buffer) - 1; + size_t buf_len = max_buf_len; + int ret; + + vmw->vkms_enabled = false; + + ret = vmw_host_get_guestinfo(GUESTINFO_VBLANK, buffer, &buf_len); + if (ret || buf_len > max_buf_len) + return; + buffer[buf_len] = '\0'; + + ret = kstrtobool(buffer, &vmw->vkms_enabled); + if (!ret && vmw->vkms_enabled) { + ret = drm_vblank_init(&vmw->drm, VMWGFX_NUM_DISPLAY_UNITS); + vmw->vkms_enabled = (ret == 0); + drm_info(&vmw->drm, "vkms_enabled = %d\n", vmw->vkms_enabled); + } +} + +bool +vmw_vkms_get_vblank_timestamp(struct drm_crtc *crtc, + int *max_error, + ktime_t *vblank_time, + bool in_vblank_irq) +{ + struct drm_device *dev = crtc->dev; + struct vmw_private *vmw = vmw_priv(dev); + unsigned int pipe = crtc->index; + struct vmw_display_unit *du = vmw_crtc_to_du(crtc); + struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; + + if (!vmw->vkms_enabled) + return false; + + if (!READ_ONCE(vblank->enabled)) { + *vblank_time = ktime_get(); + return true; + } + + *vblank_time = READ_ONCE(du->vkms.timer.node.expires); + + if (WARN_ON(*vblank_time == vblank->time)) + return true; + + /* + * To prevent races we roll the hrtimer forward before we do any + * interrupt processing - this is how real hw works (the interrupt is + * only generated after all the vblank registers are updated) and what + * the vblank core expects. Therefore we need to always correct the + * timestampe by one frame. + */ + *vblank_time -= du->vkms.period_ns; + + return true; +} + +int +vmw_vkms_enable_vblank(struct drm_crtc *crtc) +{ + struct drm_device *dev = crtc->dev; + struct vmw_private *vmw = vmw_priv(dev); + unsigned int pipe = drm_crtc_index(crtc); + struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; + struct vmw_display_unit *du = vmw_crtc_to_du(crtc); + + if (!vmw->vkms_enabled) + return -EINVAL; + + drm_calc_timestamping_constants(crtc, &crtc->mode); + + du->vkms.period_ns = ktime_set(0, vblank->framedur_ns); + hrtimer_start(&du->vkms.timer, du->vkms.period_ns, HRTIMER_MODE_REL); + + return 0; +} + +void +vmw_vkms_disable_vblank(struct drm_crtc *crtc) +{ + struct vmw_display_unit *du = vmw_crtc_to_du(crtc); + struct vmw_private *vmw = vmw_priv(crtc->dev); + + if (!vmw->vkms_enabled) + return; + + hrtimer_try_to_cancel(&du->vkms.timer); +} + +void +vmw_vkms_crtc_atomic_flush(struct drm_crtc *crtc, + struct drm_atomic_state *state) +{ + unsigned long flags; + struct vmw_private *vmw = vmw_priv(crtc->dev); + + if (vmw->vkms_enabled && crtc->state->event) { + spin_lock_irqsave(&crtc->dev->event_lock, flags); + + if (drm_crtc_vblank_get(crtc) != 0) + drm_crtc_send_vblank_event(crtc, crtc->state->event); + else + drm_crtc_arm_vblank_event(crtc, crtc->state->event); + + spin_unlock_irqrestore(&crtc->dev->event_lock, flags); + + crtc->state->event = NULL; + } +} + +void +vmw_vkms_crtc_atomic_enable(struct drm_crtc *crtc, + struct drm_atomic_state *state) +{ + struct vmw_private *vmw = vmw_priv(crtc->dev); + + if (vmw->vkms_enabled) + drm_crtc_vblank_on(crtc); +} + +void +vmw_vkms_crtc_atomic_disable(struct drm_crtc *crtc, + struct drm_atomic_state *state) +{ + struct vmw_private *vmw = vmw_priv(crtc->dev); + + if (vmw->vkms_enabled) + drm_crtc_vblank_off(crtc); +} |