linux-kernel - Re: [PATCH 1/5] drm/msm/adreno: Split up giant device table

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Message-ID: <19ca53ae-b180-4ec6-9294-dd45825af653@linaro.org>
Date:   Wed, 6 Dec 2023 13:28:58 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Rob Clark <robdclark@...il.com>, dri-devel@...ts.freedesktop.org
Cc:     freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        Rob Clark <robdclark@...omium.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Johan Hovold <johan+linaro@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5] drm/msm/adreno: Split up giant device table



On 12/5/23 23:03, Rob Clark wrote:
> From: Rob Clark <robdclark@...omium.org>
> 
> Split into a separate table per generation, in preparation to move each
> gen's device table to it's own file.
> 
> Signed-off-by: Rob Clark <robdclark@...omium.org>
> ---
>   drivers/gpu/drm/msm/adreno/adreno_device.c | 59 +++++++++++++++++++---
>   1 file changed, 51 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/adreno_device.c b/drivers/gpu/drm/msm/adreno/adreno_device.c
> index 41b13dec9bef..36392801f929 100644
> --- a/drivers/gpu/drm/msm/adreno/adreno_device.c
> +++ b/drivers/gpu/drm/msm/adreno/adreno_device.c
> @@ -20,7 +20,7 @@ bool allow_vram_carveout = false;
>   MODULE_PARM_DESC(allow_vram_carveout, "Allow using VRAM Carveout, in place of IOMMU");
>   module_param_named(allow_vram_carveout, allow_vram_carveout, bool, 0600);
>   
> -static const struct adreno_info gpulist[] = {
> +static const struct adreno_info a2xx_gpus[] = {
>   	{
>   		.chip_ids = ADRENO_CHIP_IDS(0x02000000),
>   		.family = ADRENO_2XX_GEN1,
> @@ -55,6 +55,12 @@ static const struct adreno_info gpulist[] = {
>   		.inactive_period = DRM_MSM_INACTIVE_PERIOD,
>   		.init  = a2xx_gpu_init,
>   	}, {
> +		/* sentinal */
sentinel?

> +	}
> +};
> +
> +static const struct adreno_info a3xx_gpus[] = {
> +	{
>   		.chip_ids = ADRENO_CHIP_IDS(
>   			0x03000512,
>   			0x03000520
> @@ -110,6 +116,12 @@ static const struct adreno_info gpulist[] = {
>   		.inactive_period = DRM_MSM_INACTIVE_PERIOD,
>   		.init  = a3xx_gpu_init,
>   	}, {
> +		/* sentinal */
> +	}
> +};
> +
> +static const struct adreno_info a4xx_gpus[] = {
> +	{
>   		.chip_ids = ADRENO_CHIP_IDS(0x04000500),
>   		.family = ADRENO_4XX,
>   		.revn  = 405,
> @@ -143,6 +155,12 @@ static const struct adreno_info gpulist[] = {
>   		.inactive_period = DRM_MSM_INACTIVE_PERIOD,
>   		.init  = a4xx_gpu_init,
>   	}, {
> +		/* sentinal */
> +	}
> +};
> +
> +static const struct adreno_info a5xx_gpus[] = {
> +	{
>   		.chip_ids = ADRENO_CHIP_IDS(0x05000600),
>   		.family = ADRENO_5XX,
>   		.revn = 506,
> @@ -268,6 +286,12 @@ static const struct adreno_info gpulist[] = {
>   		.init = a5xx_gpu_init,
>   		.zapfw = "a540_zap.mdt",
>   	}, {
> +		/* sentinal */
> +	}
> +};
> +
> +static const struct adreno_info a6xx_gpus[] = {
> +	{
>   		.chip_ids = ADRENO_CHIP_IDS(0x06010000),
>   		.family = ADRENO_6XX_GEN1,
>   		.revn = 610,
> @@ -493,6 +517,12 @@ static const struct adreno_info gpulist[] = {
>   		.hwcg = a690_hwcg,
>   		.address_space_size = SZ_16G,
>   	}, {
> +		/* sentinal */
> +	}
> +};
> +
> +static const struct adreno_info a7xx_gpus[] = {
> +	{
>   		.chip_ids = ADRENO_CHIP_IDS(0x07030001),
>   		.family = ADRENO_7XX_GEN1,
>   		.fw = {
> @@ -522,7 +552,18 @@ static const struct adreno_info gpulist[] = {
>   		.zapfw = "a740_zap.mdt",
>   		.hwcg = a740_hwcg,
>   		.address_space_size = SZ_16G,
> -	},
> +	}, {
> +		/* sentinal */
> +	}
> +};
> +
> +static const struct adreno_info *gpulist[] = {
> +	a2xx_gpus,
> +	a3xx_gpus,
> +	a4xx_gpus,
> +	a5xx_gpus,
> +	a6xx_gpus,
> +	a7xx_gpus,
>   };
>   
>   MODULE_FIRMWARE("qcom/a300_pm4.fw");
> @@ -557,12 +598,14 @@ static const struct adreno_info *adreno_info(uint32_t chip_id)
>   {
>   	/* identify gpu: */
>   	for (int i = 0; i < ARRAY_SIZE(gpulist); i++) {
> -		const struct adreno_info *info = &gpulist[i];
> -		if (info->machine && !of_machine_is_compatible(info->machine))
> -			continue;
> -		for (int j = 0; info->chip_ids[j]; j++)
I'm not sure using sentinels here is a good idea, it adds a
whole lot of stack size. Perhaps gpulist could be a struct
of array pointers and an array of sizes?

Konrad