[PATCH 4/4] drm/i915: Implement fbdev emulation as in-kernel client
Thomas Zimmermann
tzimmermann at suse.de
Tue Mar 28 11:14:22 UTC 2023
Replace all code that initializes or releases fbdev emulation
throughout the driver. Instead initialize the fbdev client by a
single call to i915_fbdev_setup() after i915 has registered its
DRM device. Just like in most drivers, i915 fbdev emulation now
acts like a regular DRM client.
The fbdev client setup consists of the initial preparation and the
hot-plugging of the display. The latter creates the fbdev device
and sets up the fbdev framebuffer. The setup performs display
hot-plugging once. If no display can be detected, DRM probe helpers
re-run the detection on each hotplug event.
A call to drm_dev_unregister() releases the client automatically.
No further action is required within i915. If the fbdev framebuffer
has been fully set up, struct fb_ops.fb_destroy implements the
release. For partially initialized emulation, the fbdev client
reverts the initial setup.
Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
drivers/gpu/drm/i915/display/intel_display.c | 30 ---
drivers/gpu/drm/i915/display/intel_fbdev.c | 184 +++++++++----------
drivers/gpu/drm/i915/display/intel_fbdev.h | 20 +-
drivers/gpu/drm/i915/i915_driver.c | 2 +
4 files changed, 87 insertions(+), 149 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 430a1016e013..1bbeb7a061e3 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -85,7 +85,6 @@
#include "intel_dvo.h"
#include "intel_fb.h"
#include "intel_fbc.h"
-#include "intel_fbdev.h"
#include "intel_fdi.h"
#include "intel_fifo_underrun.h"
#include "intel_frontbuffer.h"
@@ -8588,11 +8587,6 @@ int intel_modeset_init(struct drm_i915_private *i915)
intel_overlay_setup(i915);
- ret = intel_fbdev_init(&i915->drm);
- if (ret)
- return ret;
-
- /* Only enable hotplug handling once the fbdev is fully set up. */
intel_hpd_init(i915);
intel_hpd_poll_disable(i915);
@@ -8796,9 +8790,6 @@ void intel_modeset_driver_remove_noirq(struct drm_i915_private *i915)
*/
intel_hpd_poll_fini(i915);
- /* poll work can call into fbdev, hence clean that up afterwards */
- intel_fbdev_fini(i915);
-
intel_unregister_dsm_handler();
/* flush any delayed tasks or pending work */
@@ -8864,21 +8855,6 @@ void intel_display_driver_register(struct drm_i915_private *i915)
intel_display_debugfs_register(i915);
- /*
- * Some ports require correctly set-up hpd registers for
- * detection to work properly (leading to ghost connected
- * connector status), e.g. VGA on gm45. Hence we can only set
- * up the initial fbdev config after hpd irqs are fully
- * enabled. We do it last so that the async config cannot run
- * before the connectors are registered.
- */
- intel_fbdev_initial_config_async(i915);
-
- /*
- * We need to coordinate the hotplugs with the asynchronous
- * fbdev configuration, for which we use the
- * fbdev->async_cookie.
- */
drm_kms_helper_poll_init(&i915->drm);
}
@@ -8887,14 +8863,8 @@ void intel_display_driver_unregister(struct drm_i915_private *i915)
if (!HAS_DISPLAY(i915))
return;
- intel_fbdev_unregister(i915);
intel_audio_deinit(i915);
- /*
- * After flushing the fbdev (incl. a late async config which
- * will have delayed queuing of a hotplug event), then flush
- * the hotplug events.
- */
drm_kms_helper_poll_fini(&i915->drm);
drm_atomic_helper_shutdown(&i915->drm);
diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
index bdb9e6f43602..8b618db30ee5 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
@@ -24,7 +24,6 @@
* David Airlie
*/
-#include <linux/async.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/errno.h>
@@ -38,6 +37,7 @@
#include <linux/vga_switcheroo.h>
#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fourcc.h>
@@ -55,7 +55,6 @@ struct intel_fbdev {
struct intel_framebuffer *fb;
struct i915_vma *vma;
unsigned long vma_flags;
- async_cookie_t cookie;
int preferred_bpp;
/* Whether or not fbdev hpd processing is temporarily suspended */
@@ -120,6 +119,26 @@ static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
return ret;
}
+static void intel_fbdev_fb_destroy(struct fb_info *info)
+{
+ struct drm_fb_helper *fb_helper = info->par;
+ struct intel_fbdev *ifbdev = container_of(fb_helper, struct intel_fbdev, helper);
+
+ drm_fb_helper_fini(&ifbdev->helper);
+
+ /*
+ * We rely on the object-free to release the VMA pinning for
+ * the info->screen_base mmaping. Leaking the VMA is simpler than
+ * trying to rectify all the possible error paths leading here.
+ */
+ intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
+ drm_framebuffer_remove(&ifbdev->fb->base);
+
+ drm_client_release(&fb_helper->client);
+ drm_fb_helper_unprepare(&ifbdev->helper);
+ kfree(ifbdev);
+}
+
static const struct fb_ops intelfb_ops = {
.owner = THIS_MODULE,
DRM_FB_HELPER_DEFAULT_OPS,
@@ -131,6 +150,7 @@ static const struct fb_ops intelfb_ops = {
.fb_imageblit = drm_fb_helper_cfb_imageblit,
.fb_pan_display = intel_fbdev_pan_display,
.fb_blank = intel_fbdev_blank,
+ .fb_destroy = intel_fbdev_fb_destroy,
};
static int intelfb_alloc(struct drm_fb_helper *helper,
@@ -198,7 +218,6 @@ static int intelfb_create(struct drm_fb_helper *helper,
struct intel_framebuffer *intel_fb = ifbdev->fb;
struct drm_device *dev = helper->dev;
struct drm_i915_private *dev_priv = to_i915(dev);
- struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
struct i915_ggtt *ggtt = to_gt(dev_priv)->ggtt;
const struct i915_gtt_view view = {
.type = I915_GTT_VIEW_NORMAL,
@@ -323,7 +342,7 @@ static int intelfb_create(struct drm_fb_helper *helper,
ifbdev->vma_flags = flags;
intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
- vga_switcheroo_client_fb_set(pdev, info);
+
return 0;
out_unpin:
@@ -349,26 +368,6 @@ static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
.fb_dirty = intelfb_dirty,
};
-static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
-{
- /* We rely on the object-free to release the VMA pinning for
- * the info->screen_base mmaping. Leaking the VMA is simpler than
- * trying to rectify all the possible error paths leading here.
- */
-
- drm_fb_helper_fini(&ifbdev->helper);
-
- if (ifbdev->vma)
- intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
-
- if (ifbdev->fb)
- drm_framebuffer_remove(&ifbdev->fb->base);
-
- drm_client_release(&ifbdev->helper.client);
- drm_fb_helper_unprepare(&ifbdev->helper);
- kfree(ifbdev);
-}
-
/*
* Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
* The core display code will have read out the current plane configuration,
@@ -532,16 +531,6 @@ static void intel_fbdev_suspend_worker(struct work_struct *work)
true);
}
-static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
-{
- if (!ifbdev->cookie)
- return;
-
- /* Only serialises with all preceding async calls, hence +1 */
- async_synchronize_cookie(ifbdev->cookie + 1);
- ifbdev->cookie = 0;
-}
-
/* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
* processing, fbdev will perform a full connector reprobe if a hotplug event
* was received while HPD was suspended.
@@ -631,8 +620,6 @@ static void intel_fbdev_output_poll_changed(struct drm_device *dev)
if (!ifbdev)
return;
- intel_fbdev_sync(ifbdev);
-
mutex_lock(&ifbdev->hpd_lock);
send_hpd = !ifbdev->hpd_suspended;
ifbdev->hpd_waiting = true;
@@ -649,7 +636,6 @@ static void intel_fbdev_restore_mode(struct drm_i915_private *dev_priv)
if (!ifbdev)
return;
- intel_fbdev_sync(ifbdev);
if (!ifbdev->vma)
return;
@@ -662,7 +648,20 @@ static void intel_fbdev_restore_mode(struct drm_i915_private *dev_priv)
*/
static void intel_fbdev_client_unregister(struct drm_client_dev *client)
-{ }
+{
+ struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
+ struct drm_device *dev = fb_helper->dev;
+ struct pci_dev *pdev = to_pci_dev(dev->dev);
+
+ if (fb_helper->info) {
+ vga_switcheroo_client_fb_set(pdev, NULL);
+ drm_fb_helper_unregister_info(fb_helper);
+ } else {
+ drm_fb_helper_unprepare(fb_helper);
+ drm_client_release(&fb_helper->client);
+ kfree(fb_helper);
+ }
+}
static int intel_fbdev_client_restore(struct drm_client_dev *client)
{
@@ -676,9 +675,36 @@ static int intel_fbdev_client_restore(struct drm_client_dev *client)
static int intel_fbdev_client_hotplug(struct drm_client_dev *client)
{
- intel_fbdev_output_poll_changed(client->dev);
+ struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
+ struct drm_device *dev = client->dev;
+ struct pci_dev *pdev = to_pci_dev(dev->dev);
+ int ret;
+
+ if (dev->fb_helper) {
+ intel_fbdev_output_poll_changed(dev);
+ return 0;
+ }
+
+ ret = drm_fb_helper_init(dev, fb_helper);
+ if (ret)
+ goto err_drm_err;
+
+ if (!drm_drv_uses_atomic_modeset(dev))
+ drm_helper_disable_unused_functions(dev);
+
+ ret = drm_fb_helper_initial_config(fb_helper);
+ if (ret)
+ goto err_drm_fb_helper_fini;
+
+ vga_switcheroo_client_fb_set(pdev, fb_helper->info);
return 0;
+
+err_drm_fb_helper_fini:
+ drm_fb_helper_fini(fb_helper);
+err_drm_err:
+ drm_err(dev, "Failed to setup radeon fbdev emulation (ret=%d)\n", ret);
+ return ret;
}
static const struct drm_client_funcs intel_fbdev_client_funcs = {
@@ -688,22 +714,23 @@ static const struct drm_client_funcs intel_fbdev_client_funcs = {
.hotplug = intel_fbdev_client_hotplug,
};
-int intel_fbdev_init(struct drm_device *dev)
+void intel_fbdev_setup(struct drm_i915_private *dev_priv)
{
- struct drm_i915_private *dev_priv = to_i915(dev);
+ struct drm_device *dev = &dev_priv->drm;
struct intel_fbdev *ifbdev;
int ret;
if (drm_WARN_ON(dev, !HAS_DISPLAY(dev_priv)))
- return -ENODEV;
-
- ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
- if (ifbdev == NULL)
- return -ENOMEM;
+ return;
- mutex_init(&ifbdev->hpd_lock);
+ ifbdev = kzalloc(sizeof(*ifbdev), GFP_KERNEL);
+ if (!ifbdev)
+ return;
drm_fb_helper_prepare(dev, &ifbdev->helper, 32, &intel_fb_helper_funcs);
+ dev_priv->display.fbdev.fbdev = ifbdev;
+ INIT_WORK(&dev_priv->display.fbdev.suspend_work, intel_fbdev_suspend_worker);
+ mutex_init(&ifbdev->hpd_lock);
if (intel_fbdev_init_bios(dev, ifbdev))
ifbdev->helper.preferred_bpp = ifbdev->preferred_bpp;
else
@@ -711,68 +738,23 @@ int intel_fbdev_init(struct drm_device *dev)
ret = drm_client_init(dev, &ifbdev->helper.client, "i915-fbdev",
&intel_fbdev_client_funcs);
- if (ret)
+ if (ret) {
+ drm_err(dev, "Failed to register client: %d\n", ret);
goto err_drm_fb_helper_unprepare;
+ }
- ret = drm_fb_helper_init(dev, &ifbdev->helper);
+ ret = intel_fbdev_client_hotplug(&ifbdev->helper.client);
if (ret)
- goto err_drm_client_release;
+ drm_dbg_kms(dev, "client hotplug ret=%d\n", ret);
- dev_priv->display.fbdev.fbdev = ifbdev;
- INIT_WORK(&dev_priv->display.fbdev.suspend_work, intel_fbdev_suspend_worker);
+ drm_client_register(&ifbdev->helper.client);
- return 0;
+ return;
-err_drm_client_release:
- drm_client_release(&ifbdev->helper.client);
err_drm_fb_helper_unprepare:
- drm_client_release(&ifbdev->helper.client);
+ drm_fb_helper_unprepare(&ifbdev->helper);
+ mutex_destroy(&ifbdev->hpd_lock);
kfree(ifbdev);
- return ret;
-}
-
-static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
-{
- struct intel_fbdev *ifbdev = data;
-
- /* Due to peculiar init order wrt to hpd handling this is separate. */
- if (drm_fb_helper_initial_config(&ifbdev->helper))
- intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
-}
-
-void intel_fbdev_initial_config_async(struct drm_i915_private *dev_priv)
-{
- struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
-
- if (!ifbdev)
- return;
-
- ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
-}
-
-void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
-{
- struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
-
- if (!ifbdev)
- return;
-
- intel_fbdev_set_suspend(&dev_priv->drm, FBINFO_STATE_SUSPENDED, true);
-
- if (!current_is_async())
- intel_fbdev_sync(ifbdev);
-
- drm_fb_helper_unregister_info(&ifbdev->helper);
-}
-
-void intel_fbdev_fini(struct drm_i915_private *dev_priv)
-{
- struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->display.fbdev.fbdev);
-
- if (!ifbdev)
- return;
-
- intel_fbdev_destroy(ifbdev);
}
struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev)
diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.h b/drivers/gpu/drm/i915/display/intel_fbdev.h
index 8c953f102ba2..8123c813caaf 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.h
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.h
@@ -14,27 +14,11 @@ struct intel_fbdev;
struct intel_framebuffer;
#ifdef CONFIG_DRM_FBDEV_EMULATION
-int intel_fbdev_init(struct drm_device *dev);
-void intel_fbdev_initial_config_async(struct drm_i915_private *dev_priv);
-void intel_fbdev_unregister(struct drm_i915_private *dev_priv);
-void intel_fbdev_fini(struct drm_i915_private *dev_priv);
+void intel_fbdev_setup(struct drm_i915_private *dev_priv);
void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous);
struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev);
#else
-static inline int intel_fbdev_init(struct drm_device *dev)
-{
- return 0;
-}
-
-static inline void intel_fbdev_initial_config_async(struct drm_i915_private *dev_priv)
-{
-}
-
-static inline void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
-{
-}
-
-static inline void intel_fbdev_fini(struct drm_i915_private *dev_priv)
+void intel_fbdev_setup(struct drm_i915_private *dev_priv);
{
}
diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
index be804fd4f79f..0b6722bcfbb2 100644
--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -820,6 +820,8 @@ int i915_driver_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
i915->do_release = true;
+ intel_fbdev_setup(i915);
+
return 0;
out_cleanup_gem:
--
2.40.0
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