| Message ID | 20200211135218.22871-1-kraxel@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v4] drm/bochs: add drm_driver.release callback. | expand |
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 <kraxel@redhat.com> Reviewed-by: Daniel Vetter <daniel.vetter@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 >
On Tue, Feb 11, 2020 at 03:19:56PM +0100, Daniel Vetter wrote: > 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 <kraxel@redhat.com> > > Reviewed-by: Daniel Vetter <daniel.vetter@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. FYI: bochs->mmio actually can be NULL when running on very old qemu versions, the mmio bar was added in qemu release 1.3. All the register access functions in bochs_hw.c have a fallback going to ioports because of that. So there is a reason for the check, even though it is highly unlikely that mmio actually is NULL these days. qemu 1.3 was released in 2013 ... cheers, Gerd
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); }
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 <kraxel@redhat.com> --- drivers/gpu/drm/bochs/bochs_drv.c | 6 +++--- drivers/gpu/drm/bochs/bochs_hw.c | 24 +++++++++++++++++++++++- 2 files changed, 26 insertions(+), 4 deletions(-)