linux-kernel - Re: [PATCH drm-misc-next v8 01/12] drm: manager to keep track of GPUs VA mappings

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Message-ID: <2bf64010-c40a-8b84-144c-5387412b579e@arm.com>
Date:   Thu, 20 Jul 2023 11:44:02 +0100
From:   Steven Price <steven.price@....com>
To:     Danilo Krummrich <dakr@...hat.com>, airlied@...il.com,
        daniel@...ll.ch, tzimmermann@...e.de, mripard@...nel.org,
        corbet@....net, christian.koenig@....com, bskeggs@...hat.com,
        Liam.Howlett@...cle.com, matthew.brost@...el.com,
        boris.brezillon@...labora.com, alexdeucher@...il.com,
        ogabbay@...nel.org, bagasdotme@...il.com, willy@...radead.org,
        jason@...kstrand.net, donald.robson@...tec.com
Cc:     Thomas Hellström 
        <thomas.hellstrom@...ux.intel.com>, linux-doc@...r.kernel.org,
        nouveau@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, Dave Airlie <airlied@...hat.com>
Subject: Re: [PATCH drm-misc-next v8 01/12] drm: manager to keep track of GPUs
 VA mappings

On 20/07/2023 01:14, Danilo Krummrich wrote:
> Add infrastructure to keep track of GPU virtual address (VA) mappings
> with a decicated VA space manager implementation.
> 
> New UAPIs, motivated by Vulkan sparse memory bindings graphics drivers
> start implementing, allow userspace applications to request multiple and
> arbitrary GPU VA mappings of buffer objects. The DRM GPU VA manager is
> intended to serve the following purposes in this context.
> 
> 1) Provide infrastructure to track GPU VA allocations and mappings,
>    making using an interval tree (RB-tree).
> 
> 2) Generically connect GPU VA mappings to their backing buffers, in
>    particular DRM GEM objects.
> 
> 3) Provide a common implementation to perform more complex mapping
>    operations on the GPU VA space. In particular splitting and merging
>    of GPU VA mappings, e.g. for intersecting mapping requests or partial
>    unmap requests.
> 
> Acked-by: Thomas Hellström <thomas.hellstrom@...ux.intel.com>
> Acked-by: Matthew Brost <matthew.brost@...el.com>
> Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>
> Tested-by: Matthew Brost <matthew.brost@...el.com>
> Tested-by: Donald Robson <donald.robson@...tec.com>
> Suggested-by: Dave Airlie <airlied@...hat.com>
> Signed-off-by: Danilo Krummrich <dakr@...hat.com>

[...]

> diff --git a/drivers/gpu/drm/drm_gpuva_mgr.c b/drivers/gpu/drm/drm_gpuva_mgr.c
> new file mode 100644
> index 000000000000..dee2235530d6
> --- /dev/null
> +++ b/drivers/gpu/drm/drm_gpuva_mgr.c

[...]

> +static bool
> +drm_gpuva_check_overflow(u64 addr, u64 range)
> +{
> +	u64 end;
> +
> +	return WARN(check_add_overflow(addr, range, &end),
> +		    "GPUVA address limited to %lu bytes.\n", sizeof(end));
> +}

This produces a warning on 32 bit systems as sizeof() isn't necessarily 
an unsigned long. The fix below silences the warning.

Thanks,

Steve

---8<-----
>From 9c7356580362b6ac4673724f18ea6e8453b52913 Mon Sep 17 00:00:00 2001
From: Steven Price <steven.price@....com>
Date: Thu, 20 Jul 2023 10:58:09 +0100
Subject: [PATCH] drm: manager: Fix printk format for size_t

sizeof() returns a size_t which may be different to an unsigned long.
Use the correct format specifier of '%zu' to prevent compiler warnings.

Fixes: e6303f323b1a ("drm: manager to keep track of GPUs VA mappings")
Signed-off-by: Steven Price <steven.price@....com>
---
 drivers/gpu/drm/drm_gpuva_mgr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_gpuva_mgr.c b/drivers/gpu/drm/drm_gpuva_mgr.c
index 0b80177592a6..f86bfad74ff8 100644
--- a/drivers/gpu/drm/drm_gpuva_mgr.c
+++ b/drivers/gpu/drm/drm_gpuva_mgr.c
@@ -619,7 +619,7 @@ drm_gpuva_check_overflow(u64 addr, u64 range)
 	u64 end;
 
 	return WARN(check_add_overflow(addr, range, &end),
-		    "GPUVA address limited to %lu bytes.\n", sizeof(end));
+		    "GPUVA address limited to %zu bytes.\n", sizeof(end));
 }
 
 static bool
-- 
2.39.2