On Thu, Sep 01, 2022 at 11:03:33PM -0700, Radhakrishna Sripada wrote:
> From: Matt Roper <matthew.d.roper@xxxxxxxxx>
>
> Going forward, the hardware teams no longer consider new platforms to
> have a "generation" in the way we've defined it for past platforms.
> Instead, each IP block (graphics, media, display) will have their own
> architecture major.minor versions and stepping ID's which should be read
> directly from a register in the MMIO space. New hardware programming
> styles, features, and workarounds should be conditional solely on the
> architecture version, and should no longer be derived from the PCI
> device ID, revision ID, or platform-specific feature flags.
>
> Bspec: 63361, 64111
>
> v2:
> - Move the IP version readout to intel_device_info.c
> - Convert the macro into a function
>
> v3:
> - Move subplatform init to runtime early init
> - Cache runtime ver, release info to compare with hardware values.
>
> Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/gt/intel_gt_regs.h | 2 +
> drivers/gpu/drm/i915/i915_driver.c | 3 +-
> drivers/gpu/drm/i915/i915_drv.h | 2 +
> drivers/gpu/drm/i915/i915_pci.c | 1 +
> drivers/gpu/drm/i915/i915_reg.h | 7 +++
> drivers/gpu/drm/i915/intel_device_info.c | 74 +++++++++++++++++++++++-
> drivers/gpu/drm/i915/intel_device_info.h | 12 +++-
> 7 files changed, 98 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> index d414785003cc..579da62158c4 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> @@ -39,6 +39,8 @@
> #define FORCEWAKE_ACK_RENDER_GEN9 _MMIO(0xd84)
> #define FORCEWAKE_ACK_MEDIA_GEN9 _MMIO(0xd88)
>
> +#define GMD_ID_GRAPHICS _MMIO(0xd8c)
> +
> #define MCFG_MCR_SELECTOR _MMIO(0xfd0)
> #define SF_MCR_SELECTOR _MMIO(0xfd8)
> #define GEN8_MCR_SELECTOR _MMIO(0xfdc)
> diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
> index 56a2bcddb2af..a1ab49521d19 100644
> --- a/drivers/gpu/drm/i915/i915_driver.c
> +++ b/drivers/gpu/drm/i915/i915_driver.c
> @@ -323,7 +323,8 @@ static int i915_driver_early_probe(struct drm_i915_private *dev_priv)
> if (i915_inject_probe_failure(dev_priv))
> return -ENODEV;
>
> - intel_device_info_subplatform_init(dev_priv);
> + intel_device_info_runtime_init_early(dev_priv);
> +
> intel_step_init(dev_priv);
>
> intel_uncore_mmio_debug_init_early(&dev_priv->mmio_debug);
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index f85a470397a5..405b59b8c05c 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -936,6 +936,8 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
>
> #define HAS_GMCH(dev_priv) (INTEL_INFO(dev_priv)->display.has_gmch)
>
> +#define HAS_GMD_ID(i915) INTEL_INFO(i915)->has_gmd_id
> +
> #define HAS_LSPCON(dev_priv) (IS_DISPLAY_VER(dev_priv, 9, 10))
>
> #define HAS_L3_CCS_READ(i915) (INTEL_INFO(i915)->has_l3_ccs_read)
> diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
> index f6aaf938c53c..4672894f4bc1 100644
> --- a/drivers/gpu/drm/i915/i915_pci.c
> +++ b/drivers/gpu/drm/i915/i915_pci.c
> @@ -1129,6 +1129,7 @@ static const struct intel_device_info mtl_info = {
> PLATFORM(INTEL_METEORLAKE),
> .display.has_modular_fia = 1,
> .has_flat_ccs = 0,
> + .has_gmd_id = 1,
> .has_snoop = 1,
> .__runtime.memory_regions = REGION_SMEM | REGION_STOLEN_LMEM,
> .__runtime.platform_engine_mask = BIT(RCS0) | BIT(BCS0) | BIT(CCS0),
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 5e6239864c35..e02e461a4b5d 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -5798,6 +5798,11 @@
> #define ICL_DSSM_CDCLK_PLL_REFCLK_19_2MHz (1 << 29)
> #define ICL_DSSM_CDCLK_PLL_REFCLK_38_4MHz (2 << 29)
>
> +#define GMD_ID_DISPLAY _MMIO(0x510a0)
> +#define GMD_ID_ARCH_MASK REG_GENMASK(31, 22)
> +#define GMD_ID_RELEASE_MASK REG_GENMASK(21, 14)
> +#define GMD_ID_STEP REG_GENMASK(5, 0)
> +
> /*GEN11 chicken */
> #define _PIPEA_CHICKEN 0x70038
> #define _PIPEB_CHICKEN 0x71038
> @@ -8298,4 +8303,6 @@ enum skl_power_gate {
> #define MTL_LATENCY_LEVEL_EVEN_MASK REG_GENMASK(12, 0)
> #define MTL_LATENCY_LEVEL_ODD_MASK REG_GENMASK(28, 16)
>
> +#define MTL_MEDIA_GSI_BASE 0x380000
> +
> #endif /* _I915_REG_H_ */
> diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c
> index 56f19683dd55..a5bafc9be1fa 100644
> --- a/drivers/gpu/drm/i915/intel_device_info.c
> +++ b/drivers/gpu/drm/i915/intel_device_info.c
> @@ -29,6 +29,7 @@
>
> #include "display/intel_cdclk.h"
> #include "display/intel_de.h"
> +#include "gt/intel_gt_regs.h"
> #include "intel_device_info.h"
> #include "i915_drv.h"
> #include "i915_utils.h"
> @@ -231,7 +232,7 @@ static bool find_devid(u16 id, const u16 *p, unsigned int num)
> return false;
> }
>
> -void intel_device_info_subplatform_init(struct drm_i915_private *i915)
> +static void intel_device_info_subplatform_init(struct drm_i915_private *i915)
> {
> const struct intel_device_info *info = INTEL_INFO(i915);
> const struct intel_runtime_info *rinfo = RUNTIME_INFO(i915);
> @@ -288,6 +289,77 @@ void intel_device_info_subplatform_init(struct drm_i915_private *i915)
> RUNTIME_INFO(i915)->platform_mask[pi] |= mask;
> }
>
> +static void ip_ver_read(struct drm_i915_private *i915, u32 offset, struct ip_version *ip)
> +{
> + struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
> + void __iomem *addr;
> + u32 val;
> + u8 ver = ip->ver;
> + u8 rel = ip->rel;
> +
> + addr = pci_iomap_range(pdev, 0, offset, sizeof(u32));
> + if (drm_WARN_ON(&i915->drm, !addr))
> + return;
> +
> + val = ioread32(addr);
> + pci_iounmap(pdev, addr);
> +
> + ip->ver = REG_FIELD_GET(GMD_ID_ARCH_MASK, val);
> + ip->rel = REG_FIELD_GET(GMD_ID_RELEASE_MASK, val);
> + ip->step = REG_FIELD_GET(GMD_ID_STEP, val);
> +
> + /* Sanity check against expected versions from device info */
> + if (ip->ver != ver || ip->rel > rel)
this doesn't seem correct.. if we have
ip->ver == 12, ip->rel == 1
ver == 12, rel == 0
we will print
Hardware reports GMD IP version 12.1 but minimum expected is 12.0"
should it be `|| ip->rel < rel`? Once we land the static number in
device info, we can only expect new .rel versions greater than that.
