From: Michael Riesch michael.riesch@wolfvision.net
[ Upstream commit 7eb99841f340b80be0d0973b0deb592d75fb8928 ]
As pointed out in the corresponding downstream fix [0], the permission bits of the page table entries are compatible between v1 and v2 of the IOMMU. This is in contrast to the current mainline code that incorrectly assumes that the read and write permission bits are switched. Fix the permission bits by reusing the v1 bit defines.
[0] https://github.com/rockchip-linux/kernel/commit/e3bc123a2260145e34b57454da3d...
Fixes: c55356c534aa ("iommu: rockchip: Add support for iommu v2") Signed-off-by: Michael Riesch michael.riesch@wolfvision.net Reviewed-by: Heiko Stuebner heiko@sntech.de Link: https://lore.kernel.org/r/20221102063553.2464161-1-michael.riesch@wolfvision... Signed-off-by: Joerg Roedel jroedel@suse.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iommu/rockchip-iommu.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c index a3fc59b814ab..a68eadd64f38 100644 --- a/drivers/iommu/rockchip-iommu.c +++ b/drivers/iommu/rockchip-iommu.c @@ -280,19 +280,17 @@ static u32 rk_mk_pte(phys_addr_t page, int prot) * 11:9 - Page address bit 34:32 * 8:4 - Page address bit 39:35 * 3 - Security - * 2 - Readable - * 1 - Writable + * 2 - Writable + * 1 - Readable * 0 - 1 if Page @ Page address is valid */ -#define RK_PTE_PAGE_READABLE_V2 BIT(2) -#define RK_PTE_PAGE_WRITABLE_V2 BIT(1)
static u32 rk_mk_pte_v2(phys_addr_t page, int prot) { u32 flags = 0;
- flags |= (prot & IOMMU_READ) ? RK_PTE_PAGE_READABLE_V2 : 0; - flags |= (prot & IOMMU_WRITE) ? RK_PTE_PAGE_WRITABLE_V2 : 0; + flags |= (prot & IOMMU_READ) ? RK_PTE_PAGE_READABLE : 0; + flags |= (prot & IOMMU_WRITE) ? RK_PTE_PAGE_WRITABLE : 0;
return rk_mk_dte_v2(page) | flags; }