[Intel-gfx] [PATCH 4/4] drm/i915: BIOS and power context stolen mem handling for VLV
Ben Widawsky
ben at bwidawsk.net
Fri May 3 20:05:40 CEST 2013
On Thu, May 02, 2013 at 10:48:10AM -0700, Jesse Barnes wrote:
> But we need to get the right stolen base and make pre-allocated objects
> for BIOS stuff so we don't clobber it. If the BIOS hasn't allocated a
> power context, we allocate one here too, from stolen space as required
> by the docs.
>
> Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 2 +
> drivers/gpu/drm/i915/i915_gem_stolen.c | 78 +++++++++++++++++++++++++++++++-
> drivers/gpu/drm/i915/i915_reg.h | 1 +
> 3 files changed, 80 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 3ac71db..5e9ea36 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1055,6 +1055,8 @@ typedef struct drm_i915_private {
>
> struct i915_gpu_error gpu_error;
>
> + struct drm_i915_gem_object *vlv_pctx;
> +
> /* list of fbdev register on this device */
> struct intel_fbdev *fbdev;
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
> index 67d3510..c06056a 100644
> --- a/drivers/gpu/drm/i915/i915_gem_stolen.c
> +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
> @@ -62,7 +62,10 @@ static unsigned long i915_stolen_to_physical(struct drm_device *dev)
> * its value of TOLUD.
> */
> base = 0;
> - if (INTEL_INFO(dev)->gen >= 6) {
> + if (IS_VALLEYVIEW(dev)) {
> + pci_read_config_dword(pdev, 0x5c, &base);
> + base &= ((1<<19) - 1);
> + } if (INTEL_INFO(dev)->gen >= 6) {
else if
> /* Read Base Data of Stolen Memory Register (BDSM) directly.
> * Note that there is also a MCHBAR miror at 0x1080c0 or
> * we could use device 2:0x5c instead.
> @@ -172,14 +175,82 @@ void i915_gem_stolen_cleanup_compression(struct drm_device *dev)
> dev_priv->cfb_size = 0;
> }
>
> +static void valleyview_setup_pctx(struct drm_device *dev)
> +{
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + struct drm_i915_gem_object *pctx;
> + unsigned long pctx_paddr;
> + u32 pcbr;
> + int pctx_size = 24*1024;
> +
> + pcbr = I915_READ(VLV_PCBR);
> + if (pcbr) {
> + /* BIOS set it up already, grab the pre-alloc'd space */
> + int pcbr_offset;
> +
> + pcbr_offset = (pcbr & (~4095)) - dev_priv->mm.stolen_base;
s/4095/PAGE_MASK?
> + pctx = i915_gem_object_create_stolen_for_preallocated(dev_priv->dev,
> + pcbr_offset,
> + pcbr_offset,
> + pctx_size);
Can you remind me how we can get away with the assumption that gtt
offset has a 1:1 mapping with the stolen offset?
> + /* We don't need to track it since we don't own it */
> + return;
> + }
> +
> + /*
> + * From the Gunit register HAS:
> + * The Gfx driver is expected to program this register and ensure
> + * proper allocation within Gfx stolen memory. For example, this
> + * register should be programmed such than the PCBR range does not
> + * overlap with other ranges, such as the frame buffer, protected
> + * memory, or any other relevant ranges.
> + */
> + pctx = i915_gem_object_create_stolen(dev, pctx_size);
> + if (!pctx) {
> + DRM_DEBUG("not enough stolen space for PCTX, disabling\n");
> + return;
> + }
> +
> + dev_priv->vlv_pctx = pctx;
> + pctx_paddr = dev_priv->mm.stolen_base + pctx->stolen->start;
> + I915_WRITE(VLV_PCBR, pctx_paddr);
Does the powerctx need to be reinitialized after GPU reset?
> +}
> +
> +static void valleyview_cleanup_pctx(struct drm_device *dev)
> +{
> + struct drm_i915_private *dev_priv = dev->dev_private;
> +
> + if (!dev_priv->vlv_pctx)
> + return;
> +
> + i915_gem_object_release_stolen(dev_priv->vlv_pctx);
> + I915_WRITE(VLV_PCBR, 0);
> +}
> +
> void i915_gem_cleanup_stolen(struct drm_device *dev)
> {
> struct drm_i915_private *dev_priv = dev->dev_private;
>
> i915_gem_stolen_cleanup_compression(dev);
> + if (IS_VALLEYVIEW(dev))
> + valleyview_cleanup_pctx(dev);
> drm_mm_takedown(&dev_priv->mm.stolen);
> }
>
> +/* On VLV make sure we create pre-alloc'd objects for BIOS bits */
> +static void valleyview_init_bios_stolen(struct drm_i915_private *dev_priv)
> +{
> + struct drm_i915_gem_object *bios_stolen;
> + int bios_offset;
> +
> + /* Top 1M of stolen space is used by firmware */
> + bios_offset = dev_priv->gtt.stolen_size - 1024*1024;
> + bios_stolen = i915_gem_object_create_stolen_for_preallocated(dev_priv->dev,
> + bios_offset,
> + bios_offset,
> + 1024*1024);
> +}
> +
> int i915_gem_init_stolen(struct drm_device *dev)
> {
> struct drm_i915_private *dev_priv = dev->dev_private;
> @@ -194,6 +265,11 @@ int i915_gem_init_stolen(struct drm_device *dev)
> /* Basic memrange allocator for stolen space */
> drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size);
I think you should chop off the 1MB here instead of making a stolen
object which we don't want to use or touch
>
> + if (IS_VALLEYVIEW(dev)) {
> + valleyview_init_bios_stolen(dev_priv);
> + valleyview_setup_pctx(dev);
drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size - 1K);
} else {
drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size);
}
> +
> return 0;
> }
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index b5d87bd..1cc43ce 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -700,6 +700,7 @@
> #define VLV_IIR (VLV_DISPLAY_BASE + 0x20a4)
> #define VLV_IMR (VLV_DISPLAY_BASE + 0x20a8)
> #define VLV_ISR (VLV_DISPLAY_BASE + 0x20ac)
> +#define VLV_PCBR (VLV_DISPLAY_BASE + 0x2120)
> #define I915_PIPE_CONTROL_NOTIFY_INTERRUPT (1<<18)
> #define I915_DISPLAY_PORT_INTERRUPT (1<<17)
> #define I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT (1<<15)
> --
> 1.7.10.4
>
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--
Ben Widawsky, Intel Open Source Technology Center
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