| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20210507053412.GA8813@pek-qwang2-d1>
Date: Fri, 7 May 2021 13:34:12 +0800
From: Quanyang Wang <quanyang.wang@...driver.com>
To: Vinod Koul <vkoul@...nel.org>, Hyun Kwon <hyun.kwon@...inx.com>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Michal Simek <michal.simek@...inx.com>,
Tejas Upadhyay <tejasu@...inx.com>
Cc: dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: Re: [V2][PATCH] dmaengine: xilinx: dpdma: initialize registers
before request_irq
ping.
On Fri, Apr 30, 2021 at 02:40:41PM +0800, quanyang.wang@...driver.com wrote:
> From: Quanyang Wang <quanyang.wang@...driver.com>
>
> In some scenarios (kdump), dpdma hardware irqs has been enabled when
> calling request_irq in probe function, and then the dpdma irq handler
> xilinx_dpdma_irq_handler is invoked to access xdev->chan[i]. But at
> this moment xdev->chan[i] hasn't been initialized.
>
> We should ensure the dpdma controller to be in a consistent and
> clean state before further initialization. So add dpdma_hw_init()
> to do this.
>
> Furthermore, in xilinx_dpdma_disable_irq, disable all interrupts
> instead of error interrupts.
>
> This patch is to fix the kdump kernel crash as below:
>
> [ 3.696128] Unable to handle kernel NULL pointer dereference at virtual address 000000000000012c
> [ 3.696710] xilinx-zynqmp-dpdma fd4c0000.dma-controller: Xilinx DPDMA engine is probed
> [ 3.704900] Mem abort info:
> [ 3.704902] ESR = 0x96000005
> [ 3.704905] EC = 0x25: DABT (current EL), IL = 32 bits
> [ 3.704907] SET = 0, FnV = 0
> [ 3.704912] EA = 0, S1PTW = 0
> [ 3.713800] ahci-ceva fd0c0000.ahci: supply ahci not found, using dummy regulator
> [ 3.715585] Data abort info:
> [ 3.715587] ISV = 0, ISS = 0x00000005
> [ 3.715589] CM = 0, WnR = 0
> [ 3.715592] [000000000000012c] user address but active_mm is swapper
> [ 3.715596] Internal error: Oops: 96000005 [#1] SMP
> [ 3.715599] Modules linked in:
> [ 3.715608] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.0-12170-g60894882155f-dirty #77
> [ 3.723937] Hardware name: ZynqMP ZCU102 Rev1.0 (DT)
> [ 3.723942] pstate: 80000085 (Nzcv daIf -PAN -UAO -TCO BTYPE=--)
> [ 3.723956] pc : xilinx_dpdma_irq_handler+0x418/0x560
> [ 3.793049] lr : xilinx_dpdma_irq_handler+0x3d8/0x560
> [ 3.798089] sp : ffffffc01186bdf0
> [ 3.801388] x29: ffffffc01186bdf0 x28: ffffffc011836f28
> [ 3.806692] x27: ffffff8023e0ac80 x26: 0000000000000080
> [ 3.811996] x25: 0000000008000408 x24: 0000000000000003
> [ 3.817300] x23: ffffffc01186be70 x22: ffffffc011291740
> [ 3.822604] x21: 0000000000000000 x20: 0000000008000408
> [ 3.827908] x19: 0000000000000000 x18: 0000000000000010
> [ 3.833212] x17: 0000000000000000 x16: 0000000000000000
> [ 3.838516] x15: 0000000000000000 x14: ffffffc011291740
> [ 3.843820] x13: ffffffc02eb4d000 x12: 0000000034d4d91d
> [ 3.849124] x11: 0000000000000040 x10: ffffffc0112d2d48
> [ 3.854428] x9 : ffffffc0112d2d40 x8 : ffffff8021c00268
> [ 3.859732] x7 : 0000000000000000 x6 : ffffffc011836000
> [ 3.865036] x5 : 0000000000000003 x4 : 0000000000000000
> [ 3.870340] x3 : 0000000000000001 x2 : 0000000000000000
> [ 3.875644] x1 : 0000000000000000 x0 : 000000000000012c
> [ 3.880948] Call trace:
> [ 3.883382] xilinx_dpdma_irq_handler+0x418/0x560
> [ 3.888079] __handle_irq_event_percpu+0x5c/0x178
> [ 3.892774] handle_irq_event_percpu+0x34/0x98
> [ 3.897210] handle_irq_event+0x44/0xb8
> [ 3.901030] handle_fasteoi_irq+0xd0/0x190
> [ 3.905117] generic_handle_irq+0x30/0x48
> [ 3.909111] __handle_domain_irq+0x64/0xc0
> [ 3.913192] gic_handle_irq+0x78/0xa0
> [ 3.916846] el1_irq+0xc4/0x180
> [ 3.919982] cpuidle_enter_state+0x134/0x2f8
> [ 3.924243] cpuidle_enter+0x38/0x50
> [ 3.927810] call_cpuidle+0x1c/0x40
> [ 3.931290] do_idle+0x20c/0x270
> [ 3.934502] cpu_startup_entry+0x28/0x58
> [ 3.938410] rest_init+0xbc/0xcc
> [ 3.941631] arch_call_rest_init+0x10/0x1c
> [ 3.945718] start_kernel+0x51c/0x558
>
> Fixes: 7cbb0c63de3f ("dmaengine: xilinx: dpdma: Add the Xilinx DisplayPort DMA engine driver")
> Signed-off-by: Quanyang Wang <quanyang.wang@...driver.com>
> ---
> V2:
> - As per Laurent's comments, add a new hw_init function to disable interrupts
> and clear register states.
> - Abandon all modifications in V1 since the new hw_init function can
> fix this issue
>
> ---
> drivers/dma/xilinx/xilinx_dpdma.c | 24 +++++++++++++++++++++++-
> 1 file changed, 23 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/dma/xilinx/xilinx_dpdma.c b/drivers/dma/xilinx/xilinx_dpdma.c
> index d8426f915c3e..60dee30a4930 100644
> --- a/drivers/dma/xilinx/xilinx_dpdma.c
> +++ b/drivers/dma/xilinx/xilinx_dpdma.c
> @@ -1554,7 +1554,7 @@ static void xilinx_dpdma_enable_irq(struct xilinx_dpdma_device *xdev)
> */
> static void xilinx_dpdma_disable_irq(struct xilinx_dpdma_device *xdev)
> {
> - dpdma_write(xdev->reg, XILINX_DPDMA_IDS, XILINX_DPDMA_INTR_ERR_ALL);
> + dpdma_write(xdev->reg, XILINX_DPDMA_IDS, XILINX_DPDMA_INTR_ALL);
> dpdma_write(xdev->reg, XILINX_DPDMA_EIDS, XILINX_DPDMA_EINTR_ALL);
> }
>
> @@ -1691,6 +1691,26 @@ static struct dma_chan *of_dma_xilinx_xlate(struct of_phandle_args *dma_spec,
> return dma_get_slave_channel(&xdev->chan[chan_id]->vchan.chan);
> }
>
> +static void dpdma_hw_init(struct xilinx_dpdma_device *xdev)
> +{
> + unsigned int i;
> + void __iomem *reg;
> +
> + /* Disable all interrupts */
> + xilinx_dpdma_disable_irq(xdev);
> +
> + /* Stop all channels */
> + for (i = 0; i < ARRAY_SIZE(xdev->chan); i++) {
> + reg = xdev->reg + XILINX_DPDMA_CH_BASE
> + + XILINX_DPDMA_CH_OFFSET * i;
> + dpdma_clr(reg, XILINX_DPDMA_CH_CNTL, XILINX_DPDMA_CH_CNTL_ENABLE);
> + }
> +
> + /* Clear the interrupt status registers */
> + dpdma_write(xdev->reg, XILINX_DPDMA_ISR, XILINX_DPDMA_INTR_ALL);
> + dpdma_write(xdev->reg, XILINX_DPDMA_EISR, XILINX_DPDMA_EINTR_ALL);
> +}
> +
> static int xilinx_dpdma_probe(struct platform_device *pdev)
> {
> struct xilinx_dpdma_device *xdev;
> @@ -1717,6 +1737,8 @@ static int xilinx_dpdma_probe(struct platform_device *pdev)
> if (IS_ERR(xdev->reg))
> return PTR_ERR(xdev->reg);
>
> + dpdma_hw_init(xdev);
> +
> xdev->irq = platform_get_irq(pdev, 0);
> if (xdev->irq < 0) {
> dev_err(xdev->dev, "failed to get platform irq\n");
> --
> 2.25.1
>
Powered by blists - more mailing lists