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drm/imagination: Ensure PVR_MIPS_PT_PAGE_COUNT is never zero 

commit e4236b14fe upstream.

When the host page size was more than 4 times larger than the FW page
size, this macro evaluated to zero resulting in zero-sized arrays.

Use DIV_ROUND_UP() to ensure the correct behavior.

Reported-by: 20240228012313.5934-1-yaolu@kylinos.cn
Closes: https://lore.kernel.org/dri-devel/20240228012313.5934-1-yaolu@kylinos.cn
Link: https://lore.kernel.org/dri-devel/20240228012313.5934-1-yaolu@kylinos.cn
Fixes: 927f3e0253 ("drm/imagination: Implement MIPS firmware processor and MMU support")
Cc: stable@vger.kernel.org
Signed-off-by: Matt Coster <matt.coster@imgtec.com>
Reviewed-by: Frank Binns <frank.binns@imgtec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Matt Coster 2024-03-05 10:28:33 +00:00 committed by Greg Kroah-Hartman
parent deab66596d
commit 5f6ad2f224
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/imagination/pvr_fw_mips.h
View File

@ -7,13 +7,14 @@
#include "pvr_rogue_mips.h"
#include <asm/page.h>
#include <linux/math.h>
#include <linux/types.h>
/* Forward declaration from pvr_gem.h. */
struct pvr_gem_object;
#define PVR_MIPS_PT_PAGE_COUNT ((ROGUE_MIPSFW_MAX_NUM_PAGETABLE_PAGES * ROGUE_MIPSFW_PAGE_SIZE_4K) \
>> PAGE_SHIFT)
#define PVR_MIPS_PT_PAGE_COUNT DIV_ROUND_UP(ROGUE_MIPSFW_MAX_NUM_PAGETABLE_PAGES * ROGUE_MIPSFW_PAGE_SIZE_4K, PAGE_SIZE)
/**
* struct pvr_fw_mips_data - MIPS-specific data
*/