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 727ED2C3746; Mon, 12 May 2025 18:11:04 +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=1747073464; cv=none; b=ccvfTuANDktHqiEkyheB1vxq2kJUukxEJRIRDXTc6Ci8fO6DqaqG3NNN48S3qcn1j/Ar2kiY39KQA0EmF1OqRn2IoBpvN59gtdVxjiycGoz24WxmTRg+9apzTS9T7FFUeeFeokJEnEOmn5SBzdCqi2OG0819H6fpR6uuVxa2RwM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747073464; c=relaxed/simple; bh=8aUfGnDUAkPXvqElvcJszNxmgOgSO9JkJ2DCYmpj4KE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QQN5D1/82YS4fwh3oVC9oLZ6YrWdBEzScWcn7Gb3B/o9L/0ZCEW7NZV2BCTwlU7Z/Yfx28gqwSegs8G4E02p/2ikYHjyEZQnYa8h5dkupFJMLIDKOVaQAl0E65nZ+Y1eveFACzFNGx3PNjUv6oEMf1IpY4hk2Kl5GVm9Jobe8ro= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ud9WQCl4; 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="ud9WQCl4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 765A0C4CEE7; Mon, 12 May 2025 18:11:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1747073464; bh=8aUfGnDUAkPXvqElvcJszNxmgOgSO9JkJ2DCYmpj4KE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ud9WQCl4dpT9g2wJMFxAXvL0JmgKUq9hg+ajIHHnVg1z/yiuUjeV58x50iSXHaBj6 moqA5fABwoTJ280GOXXwT6tlv+nA+468ufIPSggEoAVwGH0BhGbOMO8KJn1zDRAtsa FBL2ELFSlI02+nvfac+lFW+gT2mm+0ijI2SJapCI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Alexey Klimov , Felix Kuehling , Alex Deucher Subject: [PATCH 6.6 054/113] drm/amdgpu/hdp5.2: use memcfg register to post the write for HDP flush Date: Mon, 12 May 2025 19:45:43 +0200 Message-ID: <20250512172029.869426364@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250512172027.691520737@linuxfoundation.org> References: <20250512172027.691520737@linuxfoundation.org> User-Agent: quilt/0.68 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 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alex Deucher commit dbc988c689333faeeed44d5561f372ff20395304 upstream. Reading back the remapped HDP flush register seems to cause problems on some platforms. All we need is a read, so read back the memcfg register. Fixes: f756dbac1ce1 ("drm/amdgpu/hdp5.2: do a posting read when flushing HDP") Reported-by: Alexey Klimov Link: https://lists.freedesktop.org/archives/amd-gfx/2025-April/123150.html Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4119 Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3908 Reviewed-by: Felix Kuehling Signed-off-by: Alex Deucher (cherry picked from commit 4a89b7698e771914b4d5b571600c76e2fdcbe2a9) Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/amd/amdgpu/hdp_v5_2.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/amd/amdgpu/hdp_v5_2.c +++ b/drivers/gpu/drm/amd/amdgpu/hdp_v5_2.c @@ -34,7 +34,17 @@ static void hdp_v5_2_flush_hdp(struct am if (!ring || !ring->funcs->emit_wreg) { WREG32_NO_KIQ((adev->rmmio_remap.reg_offset + KFD_MMIO_REMAP_HDP_MEM_FLUSH_CNTL) >> 2, 0); - RREG32_NO_KIQ((adev->rmmio_remap.reg_offset + KFD_MMIO_REMAP_HDP_MEM_FLUSH_CNTL) >> 2); + if (amdgpu_sriov_vf(adev)) { + /* this is fine because SR_IOV doesn't remap the register */ + RREG32_NO_KIQ((adev->rmmio_remap.reg_offset + KFD_MMIO_REMAP_HDP_MEM_FLUSH_CNTL) >> 2); + } else { + /* We just need to read back a register to post the write. + * Reading back the remapped register causes problems on + * some platforms so just read back the memory size register. + */ + if (adev->nbio.funcs->get_memsize) + adev->nbio.funcs->get_memsize(adev); + } } else { amdgpu_ring_emit_wreg(ring, (adev->rmmio_remap.reg_offset + KFD_MMIO_REMAP_HDP_MEM_FLUSH_CNTL) >> 2,