From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DA80723D7FC; Tue, 11 Nov 2025 01:37:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762825049; cv=none; b=TeXDXSmiK/0ABHxoskOq+1h08YvgmYqLde+E0+ccHWOATJfaQwZHDeMUv2Qx8Os9sr8/D3ztNRwa8nxWhf0z3ie8GMEXwuKAAv+zXab/llPuW2L530mTJWaPNh6ZpS0uHkT5ohQT6Vkg3YalGKDvraJ0QKsqLpWzOY+ozsX9Il4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762825049; c=relaxed/simple; bh=7ScxooF8r9t9TR8s8Tyn/lt6bcLmwVsDVsB5kcmLYW0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=e550BV6GJLGMZVVXZ0IYZS/lhaku0oxUIsX5rOk7VrKwqnEZo8DWxHiHAAFu0FqGhur6Sfi8EQpdnIT6jKfHtElg6+JHhfwCz03ZLhmXTvGWNVr7Y3k9nQ0gPL181w4WRmslExtrQsDKnJS6OYOUz9JEdQHzrKysgkBZ9FVXcKI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=f8DnzQ8+; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="f8DnzQ8+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7AE9EC113D0; Tue, 11 Nov 2025 01:37:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1762825049; bh=7ScxooF8r9t9TR8s8Tyn/lt6bcLmwVsDVsB5kcmLYW0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=f8DnzQ8+Ep/ARktrKZsFi1kywpJs2Iuzl7nFX2V1VcERmuZ+tBTMV57McUkyY+Ei5 QPcHpJdgm1iYh+lWKkPC2NI+f+cyHD+Tir9ccQbUukI+KMP1mqFhcQsL33aD1K5nFA Ka3DccWXiCAVflFTmoEuFDTOAnX8Ik22d7HOPYfg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Moti Haimovski , Koby Elbaz , Sasha Levin Subject: [PATCH 6.17 639/849] accel/habanalabs: support mapping cb with vmalloc-backed coherent memory Date: Tue, 11 Nov 2025 09:43:29 +0900 Message-ID: <20251111004551.877912421@linuxfoundation.org> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20251111004536.460310036@linuxfoundation.org> References: <20251111004536.460310036@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.17-stable review patch. If anyone has any objections, please let me know. ------------------ From: Moti Haimovski [ Upstream commit 513024d5a0e34fd34247043f1876b6138ca52847 ] When IOMMU is enabled, dma_alloc_coherent() with GFP_USER may return addresses from the vmalloc range. If such an address is mapped without VM_MIXEDMAP, vm_insert_page() will trigger a BUG_ON due to the VM_PFNMAP restriction. Fix this by checking for vmalloc addresses and setting VM_MIXEDMAP in the VMA before mapping. This ensures safe mapping and avoids kernel crashes. The memory is still driver-allocated and cannot be accessed directly by userspace. Signed-off-by: Moti Haimovski Reviewed-by: Koby Elbaz Signed-off-by: Koby Elbaz Signed-off-by: Sasha Levin --- drivers/accel/habanalabs/gaudi/gaudi.c | 19 +++++++++++++++++++ drivers/accel/habanalabs/gaudi2/gaudi2.c | 7 +++++++ 2 files changed, 26 insertions(+) diff --git a/drivers/accel/habanalabs/gaudi/gaudi.c b/drivers/accel/habanalabs/gaudi/gaudi.c index fa893a9b826ec..34771d75da9d7 100644 --- a/drivers/accel/habanalabs/gaudi/gaudi.c +++ b/drivers/accel/habanalabs/gaudi/gaudi.c @@ -4168,10 +4168,29 @@ static int gaudi_mmap(struct hl_device *hdev, struct vm_area_struct *vma, vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP | VM_DONTCOPY | VM_NORESERVE); +#ifdef _HAS_DMA_MMAP_COHERENT + /* + * If dma_alloc_coherent() returns a vmalloc address, set VM_MIXEDMAP + * so vm_insert_page() can handle it safely. Without this, the kernel + * may BUG_ON due to VM_PFNMAP. + */ + if (is_vmalloc_addr(cpu_addr)) + vm_flags_set(vma, VM_MIXEDMAP); + rc = dma_mmap_coherent(hdev->dev, vma, cpu_addr, (dma_addr - HOST_PHYS_BASE), size); if (rc) dev_err(hdev->dev, "dma_mmap_coherent error %d", rc); +#else + + rc = remap_pfn_range(vma, vma->vm_start, + virt_to_phys(cpu_addr) >> PAGE_SHIFT, + size, vma->vm_page_prot); + if (rc) + dev_err(hdev->dev, "remap_pfn_range error %d", rc); + + #endif + return rc; } diff --git a/drivers/accel/habanalabs/gaudi2/gaudi2.c b/drivers/accel/habanalabs/gaudi2/gaudi2.c index 3df72a5d024a6..b957957df3d3a 100644 --- a/drivers/accel/habanalabs/gaudi2/gaudi2.c +++ b/drivers/accel/habanalabs/gaudi2/gaudi2.c @@ -6490,6 +6490,13 @@ static int gaudi2_mmap(struct hl_device *hdev, struct vm_area_struct *vma, VM_DONTCOPY | VM_NORESERVE); #ifdef _HAS_DMA_MMAP_COHERENT + /* + * If dma_alloc_coherent() returns a vmalloc address, set VM_MIXEDMAP + * so vm_insert_page() can handle it safely. Without this, the kernel + * may BUG_ON due to VM_PFNMAP. + */ + if (is_vmalloc_addr(cpu_addr)) + vm_flags_set(vma, VM_MIXEDMAP); rc = dma_mmap_coherent(hdev->dev, vma, cpu_addr, dma_addr, size); if (rc) -- 2.51.0