linux-kernel - Re: [PATCH 1/2] drm/i915/jsl: Split EHL/JSL platform info and PCI ids

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Message-ID: <87d026owdq.fsf@intel.com>
Date:   Mon, 28 Sep 2020 16:37:21 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@...el.com>,
        rodrigo.vivi@...el.com, airlied@...ux.ie, daniel@...ll.ch,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, james.ausmus@...el.com,
        matthew.d.roper@...el.com, jose.souza@...el.com,
        ville.syrjala@...ux.intel.com, lucas.demarchi@...el.com,
        hariom.pandey@...el.com
Subject: Re: [PATCH 1/2] drm/i915/jsl: Split EHL/JSL platform info and PCI ids

On Mon, 28 Sep 2020, Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@...el.com> wrote:
> Split the basic platform definition, macros, and PCI IDs to
> differentiate between EHL and JSL platforms.
>
> Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@...el.com>
> ---
>  drivers/gpu/drm/i915/i915_drv.h          | 4 +++-
>  drivers/gpu/drm/i915/i915_pci.c          | 9 +++++++++
>  drivers/gpu/drm/i915/intel_device_info.c | 1 +
>  drivers/gpu/drm/i915/intel_device_info.h | 1 +
>  include/drm/i915_pciids.h                | 9 ++++++---
>  5 files changed, 20 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 72a9449b674e..4f20acebb038 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1417,7 +1417,9 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
>  #define IS_COMETLAKE(dev_priv)	IS_PLATFORM(dev_priv, INTEL_COMETLAKE)
>  #define IS_CANNONLAKE(dev_priv)	IS_PLATFORM(dev_priv, INTEL_CANNONLAKE)
>  #define IS_ICELAKE(dev_priv)	IS_PLATFORM(dev_priv, INTEL_ICELAKE)
> -#define IS_ELKHARTLAKE(dev_priv)	IS_PLATFORM(dev_priv, INTEL_ELKHARTLAKE)
> +#define IS_ELKHARTLAKE(dev_priv) (IS_PLATFORM(dev_priv, INTEL_ELKHARTLAKE) || \
> +				IS_PLATFORM(dev_priv, INTEL_JASPERLAKE))
> +#define IS_JASPERLAKE(dev_priv)	IS_PLATFORM(dev_priv, INTEL_JASPERLAKE)

I think we've learned from history that we want the platform checks to
be independent. I.e. if you need to split ELK and JSP, you need to make
IS_ELKHARTLAKE() match *only* ELK, and you need to replace every current
IS_ELKHARTLAKE() check with IS_ELKHARTLAKE() || IS_JASPERLAKE().

We've been here before, and we've thought before that we can get by with
the minimal change. It's just postponing the inevitable and generates
confusion.

BR,
Jani.


>  #define IS_TIGERLAKE(dev_priv)	IS_PLATFORM(dev_priv, INTEL_TIGERLAKE)
>  #define IS_ROCKETLAKE(dev_priv)	IS_PLATFORM(dev_priv, INTEL_ROCKETLAKE)
>  #define IS_DG1(dev_priv)        IS_PLATFORM(dev_priv, INTEL_DG1)
> diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
> index 366ddfc8df6b..8690b69fcf33 100644
> --- a/drivers/gpu/drm/i915/i915_pci.c
> +++ b/drivers/gpu/drm/i915/i915_pci.c
> @@ -846,6 +846,14 @@ static const struct intel_device_info ehl_info = {
>  	.ppgtt_size = 36,
>  };
>  
> +static const struct intel_device_info jsl_info = {
> +	GEN11_FEATURES,
> +	PLATFORM(INTEL_JASPERLAKE),
> +	.require_force_probe = 1,
> +	.platform_engine_mask = BIT(RCS0) | BIT(BCS0) | BIT(VCS0) | BIT(VECS0),
> +	.ppgtt_size = 36,
> +};
> +
>  #define GEN12_FEATURES \
>  	GEN11_FEATURES, \
>  	GEN(12), \
> @@ -985,6 +993,7 @@ static const struct pci_device_id pciidlist[] = {
>  	INTEL_CNL_IDS(&cnl_info),
>  	INTEL_ICL_11_IDS(&icl_info),
>  	INTEL_EHL_IDS(&ehl_info),
> +	INTEL_JSL_IDS(&jsl_info),
>  	INTEL_TGL_12_IDS(&tgl_info),
>  	INTEL_RKL_IDS(&rkl_info),
>  	{0, 0, 0}
> diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c
> index adc836f15fde..e67cec8fa2aa 100644
> --- a/drivers/gpu/drm/i915/intel_device_info.c
> +++ b/drivers/gpu/drm/i915/intel_device_info.c
> @@ -62,6 +62,7 @@ static const char * const platform_names[] = {
>  	PLATFORM_NAME(CANNONLAKE),
>  	PLATFORM_NAME(ICELAKE),
>  	PLATFORM_NAME(ELKHARTLAKE),
> +	PLATFORM_NAME(JASPERLAKE),
>  	PLATFORM_NAME(TIGERLAKE),
>  	PLATFORM_NAME(ROCKETLAKE),
>  	PLATFORM_NAME(DG1),
> diff --git a/drivers/gpu/drm/i915/intel_device_info.h b/drivers/gpu/drm/i915/intel_device_info.h
> index 6a3d607218aa..d92fa041c700 100644
> --- a/drivers/gpu/drm/i915/intel_device_info.h
> +++ b/drivers/gpu/drm/i915/intel_device_info.h
> @@ -79,6 +79,7 @@ enum intel_platform {
>  	/* gen11 */
>  	INTEL_ICELAKE,
>  	INTEL_ELKHARTLAKE,
> +	INTEL_JASPERLAKE,
>  	/* gen12 */
>  	INTEL_TIGERLAKE,
>  	INTEL_ROCKETLAKE,
> diff --git a/include/drm/i915_pciids.h b/include/drm/i915_pciids.h
> index 7eeecb07c9a1..1b5e09cfa11e 100644
> --- a/include/drm/i915_pciids.h
> +++ b/include/drm/i915_pciids.h
> @@ -579,15 +579,18 @@
>  	INTEL_VGA_DEVICE(0x8A51, info), \
>  	INTEL_VGA_DEVICE(0x8A5D, info)
>  
> -/* EHL/JSL */
> +/* EHL */
>  #define INTEL_EHL_IDS(info) \
>  	INTEL_VGA_DEVICE(0x4500, info),	\
>  	INTEL_VGA_DEVICE(0x4571, info), \
>  	INTEL_VGA_DEVICE(0x4551, info), \
>  	INTEL_VGA_DEVICE(0x4541, info), \
> -	INTEL_VGA_DEVICE(0x4E71, info), \
>  	INTEL_VGA_DEVICE(0x4557, info), \
> -	INTEL_VGA_DEVICE(0x4555, info), \
> +	INTEL_VGA_DEVICE(0x4555, info)
> +
> +/* JSL */
> +#define INTEL_JSL_IDS(info) \
> +	INTEL_VGA_DEVICE(0x4E71, info), \
>  	INTEL_VGA_DEVICE(0x4E61, info), \
>  	INTEL_VGA_DEVICE(0x4E57, info), \
>  	INTEL_VGA_DEVICE(0x4E55, info), \

-- 
Jani Nikula, Intel Open Source Graphics Center