mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-05-09 21:42:09 +02:00
Joel Fernandes
ba110db8e1
Move the DRM buddy allocator one level up so that it can be used by GPU drivers (example, nova-core) that have usecases other than DRM (such as VFIO vGPU support). Modify the API, structures and Kconfigs to use "gpu_buddy" terminology. Adapt the drivers and tests to use the new API. The commit cannot be split due to bisectability, however no functional change is intended. Verified by running K-UNIT tests and build tested various configurations. Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com> Reviewed-by: Dave Airlie <airlied@redhat.com> [airlied: I've split this into two so git can find copies easier. I've also just nuked drm_random library, that stuff needs to be done elsewhere and only the buddy tests seem to be using it]. Signed-off-by: Dave Airlie <airlied@redhat.com>
45 lines
1.0 KiB
C
45 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/bitops.h>
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include "gpu_random.h"
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u32 gpu_prandom_u32_max_state(u32 ep_ro, struct rnd_state *state)
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{
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return upper_32_bits((u64)prandom_u32_state(state) * ep_ro);
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}
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EXPORT_SYMBOL(gpu_prandom_u32_max_state);
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void gpu_random_reorder(unsigned int *order, unsigned int count,
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struct rnd_state *state)
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{
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unsigned int i, j;
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for (i = 0; i < count; ++i) {
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BUILD_BUG_ON(sizeof(unsigned int) > sizeof(u32));
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j = gpu_prandom_u32_max_state(count, state);
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swap(order[i], order[j]);
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}
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}
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EXPORT_SYMBOL(gpu_random_reorder);
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unsigned int *gpu_random_order(unsigned int count, struct rnd_state *state)
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{
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unsigned int *order, i;
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order = kmalloc_array(count, sizeof(*order), GFP_KERNEL);
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if (!order)
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return order;
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for (i = 0; i < count; i++)
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order[i] = i;
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gpu_random_reorder(order, count, state);
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return order;
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}
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EXPORT_SYMBOL(gpu_random_order);
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