Re: [PATCH v(N+1)] drm/i915: add plumbing for SWSCI

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2013/9/2 Jani Nikula <jani.nikula@xxxxxxxxx>:
> SWSCI is a driver to bios call interface.
>
> This checks for SWSCI availability and bios requested callbacks, and
> filters out any calls that shouldn't happen. This way the callers don't
> need to do the checks all over the place.
>
> v2: silence some checkpatch nagging
>
> v3: set PCI_SWSCI bit 0 to trigger interrupt (Mengdong Lin)
>
> v4: remove an extra #define (Jesse)
>
> v5: spec says s/w is responsible for clearing PCI_SWSCI bit 0 too
>
> v6: per Paulo's review and more:
>  - fix sub-function mask
>  - add exit parameter
>  - add define for set panel details call
>  - return more errors from swsci
>  - clean up the supported/requested callbacks bit masks mess
>  - use DSLP for timeout
>  - fix build for CONFIG_ACPI=n
>
> v7: tiny adjustment of requested vs. supported SBCB callbacks handling (Paulo)
>
> Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>

Reviewed-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>


> ---
>  drivers/gpu/drm/i915/i915_drv.h       |    2 +
>  drivers/gpu/drm/i915/intel_opregion.c |  199 ++++++++++++++++++++++++++++++++-
>  2 files changed, 198 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 0602c4b..67673e2 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -225,6 +225,8 @@ struct intel_opregion {
>         struct opregion_header __iomem *header;
>         struct opregion_acpi __iomem *acpi;
>         struct opregion_swsci __iomem *swsci;
> +       u32 swsci_gbda_sub_functions;
> +       u32 swsci_sbcb_sub_functions;
>         struct opregion_asle __iomem *asle;
>         void __iomem *vbt;
>         u32 __iomem *lid_state;
> diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
> index cfb8fb6..c45fec5 100644
> --- a/drivers/gpu/drm/i915/intel_opregion.c
> +++ b/drivers/gpu/drm/i915/intel_opregion.c
> @@ -36,8 +36,11 @@
>  #include "i915_drv.h"
>  #include "intel_drv.h"
>
> -#define PCI_ASLE 0xe4
> -#define PCI_ASLS 0xfc
> +#define PCI_ASLE               0xe4
> +#define PCI_ASLS               0xfc
> +#define PCI_SWSCI              0xe8
> +#define PCI_SWSCI_SCISEL       (1 << 15)
> +#define PCI_SWSCI_GSSCIE       (1 << 0)
>
>  #define OPREGION_HEADER_OFFSET 0
>  #define OPREGION_ACPI_OFFSET   0x100
> @@ -151,6 +154,51 @@ struct opregion_asle {
>
>  #define ASLE_CBLV_VALID         (1<<31)
>
> +/* Software System Control Interrupt (SWSCI) */
> +#define SWSCI_SCIC_INDICATOR           (1 << 0)
> +#define SWSCI_SCIC_MAIN_FUNCTION_SHIFT 1
> +#define SWSCI_SCIC_MAIN_FUNCTION_MASK  (0xf << 1)
> +#define SWSCI_SCIC_SUB_FUNCTION_SHIFT  8
> +#define SWSCI_SCIC_SUB_FUNCTION_MASK   (0xff << 8)
> +#define SWSCI_SCIC_EXIT_PARAMETER_SHIFT        8
> +#define SWSCI_SCIC_EXIT_PARAMETER_MASK (0xff << 8)
> +#define SWSCI_SCIC_EXIT_STATUS_SHIFT   5
> +#define SWSCI_SCIC_EXIT_STATUS_MASK    (7 << 5)
> +#define SWSCI_SCIC_EXIT_STATUS_SUCCESS 1
> +
> +#define SWSCI_FUNCTION_CODE(main, sub) \
> +       ((main) << SWSCI_SCIC_MAIN_FUNCTION_SHIFT | \
> +        (sub) << SWSCI_SCIC_SUB_FUNCTION_SHIFT)
> +
> +/* SWSCI: Get BIOS Data (GBDA) */
> +#define SWSCI_GBDA                     4
> +#define SWSCI_GBDA_SUPPORTED_CALLS     SWSCI_FUNCTION_CODE(SWSCI_GBDA, 0)
> +#define SWSCI_GBDA_REQUESTED_CALLBACKS SWSCI_FUNCTION_CODE(SWSCI_GBDA, 1)
> +#define SWSCI_GBDA_BOOT_DISPLAY_PREF   SWSCI_FUNCTION_CODE(SWSCI_GBDA, 4)
> +#define SWSCI_GBDA_PANEL_DETAILS       SWSCI_FUNCTION_CODE(SWSCI_GBDA, 5)
> +#define SWSCI_GBDA_TV_STANDARD         SWSCI_FUNCTION_CODE(SWSCI_GBDA, 6)
> +#define SWSCI_GBDA_INTERNAL_GRAPHICS   SWSCI_FUNCTION_CODE(SWSCI_GBDA, 7)
> +#define SWSCI_GBDA_SPREAD_SPECTRUM     SWSCI_FUNCTION_CODE(SWSCI_GBDA, 10)
> +
> +/* SWSCI: System BIOS Callbacks (SBCB) */
> +#define SWSCI_SBCB                     6
> +#define SWSCI_SBCB_SUPPORTED_CALLBACKS SWSCI_FUNCTION_CODE(SWSCI_SBCB, 0)
> +#define SWSCI_SBCB_INIT_COMPLETION     SWSCI_FUNCTION_CODE(SWSCI_SBCB, 1)
> +#define SWSCI_SBCB_PRE_HIRES_SET_MODE  SWSCI_FUNCTION_CODE(SWSCI_SBCB, 3)
> +#define SWSCI_SBCB_POST_HIRES_SET_MODE SWSCI_FUNCTION_CODE(SWSCI_SBCB, 4)
> +#define SWSCI_SBCB_DISPLAY_SWITCH      SWSCI_FUNCTION_CODE(SWSCI_SBCB, 5)
> +#define SWSCI_SBCB_SET_TV_FORMAT       SWSCI_FUNCTION_CODE(SWSCI_SBCB, 6)
> +#define SWSCI_SBCB_ADAPTER_POWER_STATE SWSCI_FUNCTION_CODE(SWSCI_SBCB, 7)
> +#define SWSCI_SBCB_DISPLAY_POWER_STATE SWSCI_FUNCTION_CODE(SWSCI_SBCB, 8)
> +#define SWSCI_SBCB_SET_BOOT_DISPLAY    SWSCI_FUNCTION_CODE(SWSCI_SBCB, 9)
> +#define SWSCI_SBCB_SET_PANEL_DETAILS   SWSCI_FUNCTION_CODE(SWSCI_SBCB, 10)
> +#define SWSCI_SBCB_SET_INTERNAL_GFX    SWSCI_FUNCTION_CODE(SWSCI_SBCB, 11)
> +#define SWSCI_SBCB_POST_HIRES_TO_DOS_FS        SWSCI_FUNCTION_CODE(SWSCI_SBCB, 16)
> +#define SWSCI_SBCB_SUSPEND_RESUME      SWSCI_FUNCTION_CODE(SWSCI_SBCB, 17)
> +#define SWSCI_SBCB_SET_SPREAD_SPECTRUM SWSCI_FUNCTION_CODE(SWSCI_SBCB, 18)
> +#define SWSCI_SBCB_POST_VBE_PM         SWSCI_FUNCTION_CODE(SWSCI_SBCB, 19)
> +#define SWSCI_SBCB_ENABLE_DISABLE_AUDIO        SWSCI_FUNCTION_CODE(SWSCI_SBCB, 21)
> +
>  #define ACPI_OTHER_OUTPUT (0<<8)
>  #define ACPI_VGA_OUTPUT (1<<8)
>  #define ACPI_TV_OUTPUT (2<<8)
> @@ -158,6 +206,91 @@ struct opregion_asle {
>  #define ACPI_LVDS_OUTPUT (4<<8)
>
>  #ifdef CONFIG_ACPI
> +static int swsci(struct drm_device *dev, u32 function, u32 parm, u32 *parm_out)
> +{
> +       struct drm_i915_private *dev_priv = dev->dev_private;
> +       struct opregion_swsci __iomem *swsci = dev_priv->opregion.swsci;
> +       u32 main_function, sub_function, scic;
> +       u16 pci_swsci;
> +       u32 dslp;
> +
> +       if (!swsci)
> +               return -ENODEV;
> +
> +       main_function = (function & SWSCI_SCIC_MAIN_FUNCTION_MASK) >>
> +               SWSCI_SCIC_MAIN_FUNCTION_SHIFT;
> +       sub_function = (function & SWSCI_SCIC_SUB_FUNCTION_MASK) >>
> +               SWSCI_SCIC_SUB_FUNCTION_SHIFT;
> +
> +       /* Check if we can call the function. See swsci_setup for details. */
> +       if (main_function == SWSCI_SBCB) {
> +               if ((dev_priv->opregion.swsci_sbcb_sub_functions &
> +                    (1 << sub_function)) == 0)
> +                       return -EINVAL;
> +       } else if (main_function == SWSCI_GBDA) {
> +               if ((dev_priv->opregion.swsci_gbda_sub_functions &
> +                    (1 << sub_function)) == 0)
> +                       return -EINVAL;
> +       }
> +
> +       /* Driver sleep timeout in ms. */
> +       dslp = ioread32(&swsci->dslp);
> +       if (!dslp) {
> +               dslp = 2;
> +       } else if (dslp > 500) {
> +               /* Hey bios, trust must be earned. */
> +               WARN_ONCE(1, "excessive driver sleep timeout (DSPL) %u\n", dslp);
> +               dslp = 500;
> +       }
> +
> +       /* The spec tells us to do this, but we are the only user... */
> +       scic = ioread32(&swsci->scic);
> +       if (scic & SWSCI_SCIC_INDICATOR) {
> +               DRM_DEBUG_DRIVER("SWSCI request already in progress\n");
> +               return -EBUSY;
> +       }
> +
> +       scic = function | SWSCI_SCIC_INDICATOR;
> +
> +       iowrite32(parm, &swsci->parm);
> +       iowrite32(scic, &swsci->scic);
> +
> +       /* Ensure SCI event is selected and event trigger is cleared. */
> +       pci_read_config_word(dev->pdev, PCI_SWSCI, &pci_swsci);
> +       if (!(pci_swsci & PCI_SWSCI_SCISEL) || (pci_swsci & PCI_SWSCI_GSSCIE)) {
> +               pci_swsci |= PCI_SWSCI_SCISEL;
> +               pci_swsci &= ~PCI_SWSCI_GSSCIE;
> +               pci_write_config_word(dev->pdev, PCI_SWSCI, pci_swsci);
> +       }
> +
> +       /* Use event trigger to tell bios to check the mail. */
> +       pci_swsci |= PCI_SWSCI_GSSCIE;
> +       pci_write_config_word(dev->pdev, PCI_SWSCI, pci_swsci);
> +
> +       /* Poll for the result. */
> +#define C (((scic = ioread32(&swsci->scic)) & SWSCI_SCIC_INDICATOR) == 0)
> +       if (wait_for(C, dslp)) {
> +               DRM_DEBUG_DRIVER("SWSCI request timed out\n");
> +               return -ETIMEDOUT;
> +       }
> +
> +       scic = (scic & SWSCI_SCIC_EXIT_STATUS_MASK) >>
> +               SWSCI_SCIC_EXIT_STATUS_SHIFT;
> +
> +       /* Note: scic == 0 is an error! */
> +       if (scic != SWSCI_SCIC_EXIT_STATUS_SUCCESS) {
> +               DRM_DEBUG_DRIVER("SWSCI request error %u\n", scic);
> +               return -EIO;
> +       }
> +
> +       if (parm_out)
> +               *parm_out = ioread32(&swsci->parm);
> +
> +       return 0;
> +
> +#undef C
> +}
> +
>  static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
>  {
>         struct drm_i915_private *dev_priv = dev->dev_private;
> @@ -447,7 +580,66 @@ void intel_opregion_fini(struct drm_device *dev)
>         opregion->asle = NULL;
>         opregion->vbt = NULL;
>  }
> -#endif
> +
> +static void swsci_setup(struct drm_device *dev)
> +{
> +       struct drm_i915_private *dev_priv = dev->dev_private;
> +       struct intel_opregion *opregion = &dev_priv->opregion;
> +       bool requested_callbacks = false;
> +       u32 tmp;
> +
> +       /* Sub-function code 0 is okay, let's allow them. */
> +       opregion->swsci_gbda_sub_functions = 1;
> +       opregion->swsci_sbcb_sub_functions = 1;
> +
> +       /* We use GBDA to ask for supported GBDA calls. */
> +       if (swsci(dev, SWSCI_GBDA_SUPPORTED_CALLS, 0, &tmp) == 0) {
> +               /* make the bits match the sub-function codes */
> +               tmp <<= 1;
> +               opregion->swsci_gbda_sub_functions |= tmp;
> +       }
> +
> +       /*
> +        * We also use GBDA to ask for _requested_ SBCB callbacks. The driver
> +        * must not call interfaces that are not specifically requested by the
> +        * bios.
> +        */
> +       if (swsci(dev, SWSCI_GBDA_REQUESTED_CALLBACKS, 0, &tmp) == 0) {
> +               /* here, the bits already match sub-function codes */
> +               opregion->swsci_sbcb_sub_functions |= tmp;
> +               requested_callbacks = true;
> +       }
> +
> +       /*
> +        * But we use SBCB to ask for _supported_ SBCB calls. This does not mean
> +        * the callback is _requested_. But we still can't call interfaces that
> +        * are not requested.
> +        */
> +       if (swsci(dev, SWSCI_SBCB_SUPPORTED_CALLBACKS, 0, &tmp) == 0) {
> +               /* make the bits match the sub-function codes */
> +               u32 low = tmp & 0x7ff;
> +               u32 high = tmp & ~0xfff; /* bit 11 is reserved */
> +               tmp = (high << 4) | (low << 1) | 1;
> +
> +               /* best guess what to do with supported wrt requested */
> +               if (requested_callbacks) {
> +                       u32 req = opregion->swsci_sbcb_sub_functions;
> +                       if ((req & tmp) != req)
> +                               DRM_DEBUG_DRIVER("SWSCI BIOS requested (%08x) SBCB callbacks that are not supported (%08x)\n", req, tmp);
> +                       /* XXX: for now, trust the requested callbacks */
> +                       /* opregion->swsci_sbcb_sub_functions &= tmp; */
> +               } else {
> +                       opregion->swsci_sbcb_sub_functions |= tmp;
> +               }
> +       }
> +
> +       DRM_DEBUG_DRIVER("SWSCI GBDA callbacks %08x, SBCB callbacks %08x\n",
> +                        opregion->swsci_gbda_sub_functions,
> +                        opregion->swsci_sbcb_sub_functions);
> +}
> +#else /* CONFIG_ACPI */
> +static inline void swsci_setup(struct drm_device *dev) {}
> +#endif  /* CONFIG_ACPI */
>
>  int intel_opregion_setup(struct drm_device *dev)
>  {
> @@ -490,6 +682,7 @@ int intel_opregion_setup(struct drm_device *dev)
>         if (mboxes & MBOX_SWSCI) {
>                 DRM_DEBUG_DRIVER("SWSCI supported\n");
>                 opregion->swsci = base + OPREGION_SWSCI_OFFSET;
> +               swsci_setup(dev);
>         }
>         if (mboxes & MBOX_ASLE) {
>                 DRM_DEBUG_DRIVER("ASLE supported\n");
> --
> 1.7.9.5
>



-- 
Paulo Zanoni
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