Hi Daniel -
On Thu, 07 Jun 2012, Daniel Vetter <daniel.vetter at ffwll.ch> wrote:
> I've done an audit of everything which is being set up between the
> place where drm_pci_agp_init is called currently and where the
> driver's ->load function is called. Nothing seems to depend upon
> dev->agp being set up correctly.
>
> This is one big step into squashing this giant midlayer mistaken.
> Though one that drm/i915 is hurting especially: We don't need (and
> want) the agp layer on many chips, but we need to decide whether we
> want to enable it too early.
>
> By moving the agp setup into the drivers control, we can do an
> intelligent decision in drm/i915 whether we need agp support (for
> anything ums and some horrible kms userspace on specific generations)
> or whether it's not required.
>
> Also, this allows us to rip out a bit of the agp invasion from generic
> drm core code in follow-up patches.
>
> Signed-Off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> ---
> drivers/gpu/drm/drm_pci.c | 2 +-
> drivers/gpu/drm/drm_stub.c | 8 --------
> drivers/gpu/drm/i810/i810_dma.c | 6 ++++++
> drivers/gpu/drm/i915/i915_dma.c | 4 ++++
> drivers/gpu/drm/mga/mga_dma.c | 4 ++++
> drivers/gpu/drm/nouveau/nouveau_state.c | 4 ++++
> drivers/gpu/drm/r128/r128_drv.c | 6 ++++++
> drivers/gpu/drm/radeon/radeon_cp.c | 4 ++++
> drivers/gpu/drm/radeon/radeon_kms.c | 4 ++++
> drivers/gpu/drm/savage/savage_bci.c | 5 +++++
> drivers/gpu/drm/sis/sis_drv.c | 5 +++++
> drivers/gpu/drm/via/via_map.c | 4 ++++
> include/drm/drmP.h | 5 +----
> 13 files changed, 48 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c
> index 13f3d93..833e599 100644
> --- a/drivers/gpu/drm/drm_pci.c
> +++ b/drivers/gpu/drm/drm_pci.c
> @@ -286,6 +286,7 @@ int drm_pci_agp_init(struct drm_device *dev)
> }
> return 0;
> }
> +EXPORT_SYMBOL(drm_pci_agp_init);
>
> static struct drm_bus drm_pci_bus = {
> .bus_type = DRIVER_BUS_PCI,
> @@ -294,7 +295,6 @@ static struct drm_bus drm_pci_bus = {
> .set_busid = drm_pci_set_busid,
> .set_unique = drm_pci_set_unique,
> .irq_by_busid = drm_pci_irq_by_busid,
> - .agp_init = drm_pci_agp_init,
> };
>
> /**
> diff --git a/drivers/gpu/drm/drm_stub.c b/drivers/gpu/drm/drm_stub.c
> index 21bcd4a..4a4a1ed 100644
> --- a/drivers/gpu/drm/drm_stub.c
> +++ b/drivers/gpu/drm/drm_stub.c
> @@ -289,14 +289,6 @@ int drm_fill_in_dev(struct drm_device *dev,
>
> dev->driver = driver;
>
> - if (dev->driver->bus->agp_init) {
> - retcode = dev->driver->bus->agp_init(dev);
> - if (retcode)
> - goto error_out_unreg;
> - }
If something fails in drm_fill_in_dev() after ->agp_init(), the error
path calls drm_lastclose(), which, IIUC, deallocates anything allocated
through drm_pci_agp_init(). It's all buried in a bunch of layers, so I
may be mistaken... But where's this cleanup done if any of the init
fails after drm_pci_agp_init() in the driver load functions below?
BR,
Jani.
> -
> -
> -
> retcode = drm_ctxbitmap_init(dev);
> if (retcode) {
> DRM_ERROR("Cannot allocate memory for context bitmap.\n");
> diff --git a/drivers/gpu/drm/i810/i810_dma.c b/drivers/gpu/drm/i810/i810_dma.c
> index f920fb5..eed1126 100644
> --- a/drivers/gpu/drm/i810/i810_dma.c
> +++ b/drivers/gpu/drm/i810/i810_dma.c
> @@ -1198,6 +1198,12 @@ static int i810_flip_bufs(struct drm_device *dev, void *data,
>
> int i810_driver_load(struct drm_device *dev, unsigned long flags)
> {
> + int ret;
> +
> + ret = drm_pci_agp_init(dev);
> + if (ret)
> + return ret;
> +
> /* i810 has 4 more counters */
> dev->counters += 4;
> dev->types[6] = _DRM_STAT_IRQ;
> diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
> index 97a5a58..b97ef73 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -1422,6 +1422,10 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
> int ret = 0, mmio_bar;
> uint32_t aperture_size;
>
> + ret = drm_pci_agp_init(dev);
> + if (ret)
> + return ret;
> +
> info = (struct intel_device_info *) flags;
>
> /* Refuse to load on gen6+ without kms enabled. */
> diff --git a/drivers/gpu/drm/mga/mga_dma.c b/drivers/gpu/drm/mga/mga_dma.c
> index 507aa3d..549816e 100644
> --- a/drivers/gpu/drm/mga/mga_dma.c
> +++ b/drivers/gpu/drm/mga/mga_dma.c
> @@ -394,6 +394,10 @@ int mga_driver_load(struct drm_device *dev, unsigned long flags)
> drm_mga_private_t *dev_priv;
> int ret;
>
> + ret = drm_pci_agp_init(dev);
> + if (ret)
> + return ret;
> +
> dev_priv = kzalloc(sizeof(drm_mga_private_t), GFP_KERNEL);
> if (!dev_priv)
> return -ENOMEM;
> diff --git a/drivers/gpu/drm/nouveau/nouveau_state.c b/drivers/gpu/drm/nouveau/nouveau_state.c
> index 19706f0..dbc881a 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_state.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_state.c
> @@ -1029,6 +1029,10 @@ int nouveau_load(struct drm_device *dev, unsigned long flags)
> uint32_t reg0 = ~0, strap;
> int ret;
>
> + ret = drm_pci_agp_init(dev);
> + if (ret)
> + return ret;
> +
> dev_priv = kzalloc(sizeof(*dev_priv), GFP_KERNEL);
> if (!dev_priv) {
> ret = -ENOMEM;
> diff --git a/drivers/gpu/drm/r128/r128_drv.c b/drivers/gpu/drm/r128/r128_drv.c
> index 88718fa..22001ca 100644
> --- a/drivers/gpu/drm/r128/r128_drv.c
> +++ b/drivers/gpu/drm/r128/r128_drv.c
> @@ -85,6 +85,12 @@ static struct drm_driver driver = {
>
> int r128_driver_load(struct drm_device *dev, unsigned long flags)
> {
> + int ret;
> +
> + ret = drm_pci_agp_init(dev);
> + if (ret)
> + return ret;
> +
> pci_set_master(dev->pdev);
> return drm_vblank_init(dev, 1);
> }
> diff --git a/drivers/gpu/drm/radeon/radeon_cp.c b/drivers/gpu/drm/radeon/radeon_cp.c
> index ef67e18..1096296 100644
> --- a/drivers/gpu/drm/radeon/radeon_cp.c
> +++ b/drivers/gpu/drm/radeon/radeon_cp.c
> @@ -2084,6 +2084,10 @@ int radeon_driver_load(struct drm_device *dev, unsigned long flags)
> drm_radeon_private_t *dev_priv;
> int ret = 0;
>
> + ret = drm_pci_agp_init(dev);
> + if (ret)
> + return ret;
> +
> dev_priv = kzalloc(sizeof(drm_radeon_private_t), GFP_KERNEL);
> if (dev_priv == NULL)
> return -ENOMEM;
> diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
> index f1016a5..61ab2fd 100644
> --- a/drivers/gpu/drm/radeon/radeon_kms.c
> +++ b/drivers/gpu/drm/radeon/radeon_kms.c
> @@ -51,6 +51,10 @@ int radeon_driver_load_kms(struct drm_device *dev, unsigned long flags)
> struct radeon_device *rdev;
> int r, acpi_status;
>
> + r = drm_pci_agp_init(dev);
> + if (r)
> + return r;
> +
> rdev = kzalloc(sizeof(struct radeon_device), GFP_KERNEL);
> if (rdev == NULL) {
> return -ENOMEM;
> diff --git a/drivers/gpu/drm/savage/savage_bci.c b/drivers/gpu/drm/savage/savage_bci.c
> index 6eb507a..6d70c4b 100644
> --- a/drivers/gpu/drm/savage/savage_bci.c
> +++ b/drivers/gpu/drm/savage/savage_bci.c
> @@ -538,6 +538,11 @@ static void savage_fake_dma_flush(drm_savage_private_t * dev_priv)
> int savage_driver_load(struct drm_device *dev, unsigned long chipset)
> {
> drm_savage_private_t *dev_priv;
> + int ret;
> +
> + ret = drm_pci_agp_init(dev);
> + if (ret)
> + return ret;
>
> dev_priv = kzalloc(sizeof(drm_savage_private_t), GFP_KERNEL);
> if (dev_priv == NULL)
> diff --git a/drivers/gpu/drm/sis/sis_drv.c b/drivers/gpu/drm/sis/sis_drv.c
> index 30d98d1..9726ee0 100644
> --- a/drivers/gpu/drm/sis/sis_drv.c
> +++ b/drivers/gpu/drm/sis/sis_drv.c
> @@ -40,6 +40,11 @@ static struct pci_device_id pciidlist[] = {
> static int sis_driver_load(struct drm_device *dev, unsigned long chipset)
> {
> drm_sis_private_t *dev_priv;
> + int ret;
> +
> + ret = drm_pci_agp_init(dev);
> + if (ret)
> + return ret;
>
> pci_set_master(dev->pdev);
>
> diff --git a/drivers/gpu/drm/via/via_map.c b/drivers/gpu/drm/via/via_map.c
> index 1f18225..5ab53bf 100644
> --- a/drivers/gpu/drm/via/via_map.c
> +++ b/drivers/gpu/drm/via/via_map.c
> @@ -96,6 +96,10 @@ int via_driver_load(struct drm_device *dev, unsigned long chipset)
> drm_via_private_t *dev_priv;
> int ret = 0;
>
> + ret = drm_pci_agp_init(dev);
> + if (ret)
> + return ret;
> +
> dev_priv = kzalloc(sizeof(drm_via_private_t), GFP_KERNEL);
> if (dev_priv == NULL)
> return -ENOMEM;
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index 31ad880..e3437da 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -726,9 +726,6 @@ struct drm_bus {
> int (*set_unique)(struct drm_device *dev, struct drm_master *master,
> struct drm_unique *unique);
> int (*irq_by_busid)(struct drm_device *dev, struct drm_irq_busid *p);
> - /* hooks that are for PCI */
> - int (*agp_init)(struct drm_device *dev);
> -
> };
>
> /**
> @@ -1754,6 +1751,7 @@ static __inline__ int drm_pci_device_is_agp(struct drm_device *dev)
>
> return pci_find_capability(dev->pdev, PCI_CAP_ID_AGP);
> }
> +extern int drm_pci_agp_init(struct drm_device *dev);
>
> extern int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver);
> extern void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver);
> @@ -1761,7 +1759,6 @@ extern int drm_get_pci_dev(struct pci_dev *pdev,
> const struct pci_device_id *ent,
> struct drm_driver *driver);
>
> -
> /* platform section */
> extern int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device);
> extern void drm_platform_exit(struct drm_driver *driver, struct platform_device *platform_device);
> --
> 1.7.7.6
>
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