On Tue, Feb 11, 2020 at 02:52:18PM +0100, Gerd Hoffmann wrote:
> Call bochs_unload via drm_driver.release to make sure we release stuff
> when it is safe to do so. Use drm_dev_{enter,exit,unplug} to avoid
> touching hardware after device removal. Tidy up here and there.
>
> v4: add changelog.
> v3: use drm_dev_*().
> v2: move hardware deinit to pci_remove().
>
> Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vet...@ffwll.ch>
Btw I checked around whether there's anything else that obviously needs a
drm_dev_enter/exit, and I spotted the !bochs->mmio check in
bochs_hw_load_edid. That one looks like cargo-cult, there's a single
caller in the init path, so either mmio works at that point or this is
dead code ... slightly confusing.
-Daniel
> ---
> drivers/gpu/drm/bochs/bochs_drv.c | 6 +++---
> drivers/gpu/drm/bochs/bochs_hw.c | 24 +++++++++++++++++++++++-
> 2 files changed, 26 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/bochs/bochs_drv.c
> b/drivers/gpu/drm/bochs/bochs_drv.c
> index 10460878414e..addb0568c1af 100644
> --- a/drivers/gpu/drm/bochs/bochs_drv.c
> +++ b/drivers/gpu/drm/bochs/bochs_drv.c
> @@ -23,7 +23,6 @@ static void bochs_unload(struct drm_device *dev)
>
> bochs_kms_fini(bochs);
> bochs_mm_fini(bochs);
> - bochs_hw_fini(dev);
> kfree(bochs);
> dev->dev_private = NULL;
> }
> @@ -69,6 +68,7 @@ static struct drm_driver bochs_driver = {
> .major = 1,
> .minor = 0,
> DRM_GEM_VRAM_DRIVER,
> + .release = bochs_unload,
> };
>
> /* ---------------------------------------------------------------------- */
> @@ -148,9 +148,9 @@ static void bochs_pci_remove(struct pci_dev *pdev)
> {
> struct drm_device *dev = pci_get_drvdata(pdev);
>
> + drm_dev_unplug(dev);
> drm_atomic_helper_shutdown(dev);
> - drm_dev_unregister(dev);
> - bochs_unload(dev);
> + bochs_hw_fini(dev);
> drm_dev_put(dev);
> }
>
> diff --git a/drivers/gpu/drm/bochs/bochs_hw.c
> b/drivers/gpu/drm/bochs/bochs_hw.c
> index b615b7dfdd9d..952199cc0462 100644
> --- a/drivers/gpu/drm/bochs/bochs_hw.c
> +++ b/drivers/gpu/drm/bochs/bochs_hw.c
> @@ -4,6 +4,7 @@
>
> #include <linux/pci.h>
>
> +#include <drm/drm_drv.h>
> #include <drm/drm_fourcc.h>
>
> #include "bochs.h"
> @@ -194,6 +195,8 @@ void bochs_hw_fini(struct drm_device *dev)
> {
> struct bochs_device *bochs = dev->dev_private;
>
> + /* TODO: shot down existing vram mappings */
> +
> if (bochs->mmio)
> iounmap(bochs->mmio);
> if (bochs->ioports)
> @@ -207,6 +210,11 @@ void bochs_hw_fini(struct drm_device *dev)
> void bochs_hw_setmode(struct bochs_device *bochs,
> struct drm_display_mode *mode)
> {
> + int idx;
> +
> + if (!drm_dev_enter(bochs->dev, &idx))
> + return;
> +
> bochs->xres = mode->hdisplay;
> bochs->yres = mode->vdisplay;
> bochs->bpp = 32;
> @@ -232,11 +240,18 @@ void bochs_hw_setmode(struct bochs_device *bochs,
>
> bochs_dispi_write(bochs, VBE_DISPI_INDEX_ENABLE,
> VBE_DISPI_ENABLED | VBE_DISPI_LFB_ENABLED);
> +
> + drm_dev_exit(idx);
> }
>
> void bochs_hw_setformat(struct bochs_device *bochs,
> const struct drm_format_info *format)
> {
> + int idx;
> +
> + if (!drm_dev_enter(bochs->dev, &idx))
> + return;
> +
> DRM_DEBUG_DRIVER("format %c%c%c%c\n",
> (format->format >> 0) & 0xff,
> (format->format >> 8) & 0xff,
> @@ -256,13 +271,18 @@ void bochs_hw_setformat(struct bochs_device *bochs,
> __func__, format->format);
> break;
> }
> +
> + drm_dev_exit(idx);
> }
>
> void bochs_hw_setbase(struct bochs_device *bochs,
> int x, int y, int stride, u64 addr)
> {
> unsigned long offset;
> - unsigned int vx, vy, vwidth;
> + unsigned int vx, vy, vwidth, idx;
> +
> + if (!drm_dev_enter(bochs->dev, &idx))
> + return;
>
> bochs->stride = stride;
> offset = (unsigned long)addr +
> @@ -277,4 +297,6 @@ void bochs_hw_setbase(struct bochs_device *bochs,
> bochs_dispi_write(bochs, VBE_DISPI_INDEX_VIRT_WIDTH, vwidth);
> bochs_dispi_write(bochs, VBE_DISPI_INDEX_X_OFFSET, vx);
> bochs_dispi_write(bochs, VBE_DISPI_INDEX_Y_OFFSET, vy);
> +
> + drm_dev_exit(idx);
> }
> --
> 2.18.2
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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