From: Shubhrajyoti Datta shubhrajyoti.datta@amd.com
[ Upstream commit b1dc7f097b78eb8d25b071ead2384b07a549692b ]
Clear the ECC error and counter registers during initialization/probe to avoid reporting stale errors that may have occurred before EDAC registration.
For that, unify the Zynq and ZynqMP ECC state reading paths and simplify the code.
[ bp: Massage commit message. Fix an -Wsometimes-uninitialized warning as reported by Reported-by: kernel test robot lkp@intel.com Closes: https://lore.kernel.org/oe-kbuild-all/202507141048.obUv3ZUm-lkp@intel.com ]
Signed-off-by: Shubhrajyoti Datta shubhrajyoti.datta@amd.com Signed-off-by: Borislav Petkov (AMD) bp@alien8.de Link: https://lore.kernel.org/20250713050753.7042-1-shubhrajyoti.datta@amd.com Signed-off-by: Sasha Levin sashal@kernel.org ---
LLM Generated explanations, may be completely bogus:
**Backport Status: YES**
This commit is suitable for backporting to stable kernel trees based on the following analysis:
## Bug Fix Nature The commit fixes a clear bug where the EDAC driver could report stale ECC errors from before the driver was initialized. This is evident from the commit message: "Clear the ECC error and counter registers during initialization/probe to avoid reporting stale errors that may have occurred before EDAC registration."
## Code Changes Analysis
1. **Problem Being Fixed**: - The driver wasn't clearing ECC error counters during initialization - This could lead to false error reports from pre-boot or pre-driver- load errors - Users could see incorrect ECC error counts that don't reflect actual runtime errors
2. **Solution Implementation**: - The patch consolidates the ECC state checking into a single `get_ecc_state()` function - Adds counter clearing logic for both Zynq and ZynqMP platforms: ```c // For Zynq: clearval = ECC_CTRL_CLR_CE_ERR | ECC_CTRL_CLR_UE_ERR; writel(clearval, priv->baseaddr + ECC_CTRL_OFST); writel(0x0, priv->baseaddr + ECC_CTRL_OFST);
// For ZynqMP: clearval = readl(priv->baseaddr + ECC_CLR_OFST) | ECC_CTRL_CLR_CE_ERR | ECC_CTRL_CLR_CE_ERRCNT | ECC_CTRL_CLR_UE_ERR | ECC_CTRL_CLR_UE_ERRCNT; writel(clearval, priv->baseaddr + ECC_CLR_OFST); ```
3. **Scope and Risk Assessment**: - Changes are confined to the synopsys_edac driver - No API changes or interface modifications - The refactoring simplifies code by removing duplicate `zynq_get_ecc_state()` and `zynqmp_get_ecc_state()` functions - Adds platform type enum for cleaner platform identification - Risk is minimal as it only affects initialization path
4. **Stable Tree Criteria Compliance**: - ✓ Fixes a real bug (stale error reporting) - ✓ Small and contained changes (~150 lines) - ✓ No new features added - ✓ No architectural changes - ✓ Low regression risk - ✓ Clear fix for a specific problem
5. **Additional Evidence**: - The maintainer (Borislav Petkov) accepted and massaged the patch - Fixed a compiler warning caught by kernel test robot - The bug could affect production systems by showing false ECC errors
This is a textbook example of a stable-worthy patch: it fixes a specific bug (stale ECC error reporting) with minimal, focused changes that don't introduce new functionality or risk.
drivers/edac/synopsys_edac.c | 97 +++++++++++++++++------------------- 1 file changed, 46 insertions(+), 51 deletions(-)
diff --git a/drivers/edac/synopsys_edac.c b/drivers/edac/synopsys_edac.c index 6ddc90d7ba7c..f8aaada42d3f 100644 --- a/drivers/edac/synopsys_edac.c +++ b/drivers/edac/synopsys_edac.c @@ -332,20 +332,26 @@ struct synps_edac_priv { #endif };
+enum synps_platform_type { + ZYNQ, + ZYNQMP, + SYNPS, +}; + /** * struct synps_platform_data - synps platform data structure. + * @platform: Identifies the target hardware platform * @get_error_info: Get EDAC error info. * @get_mtype: Get mtype. * @get_dtype: Get dtype. - * @get_ecc_state: Get ECC state. * @get_mem_info: Get EDAC memory info * @quirks: To differentiate IPs. */ struct synps_platform_data { + enum synps_platform_type platform; int (*get_error_info)(struct synps_edac_priv *priv); enum mem_type (*get_mtype)(const void __iomem *base); enum dev_type (*get_dtype)(const void __iomem *base); - bool (*get_ecc_state)(void __iomem *base); #ifdef CONFIG_EDAC_DEBUG u64 (*get_mem_info)(struct synps_edac_priv *priv); #endif @@ -720,51 +726,38 @@ static enum dev_type zynqmp_get_dtype(const void __iomem *base) return dt; }
-/** - * zynq_get_ecc_state - Return the controller ECC enable/disable status. - * @base: DDR memory controller base address. - * - * Get the ECC enable/disable status of the controller. - * - * Return: true if enabled, otherwise false. - */ -static bool zynq_get_ecc_state(void __iomem *base) +static bool get_ecc_state(struct synps_edac_priv *priv) { + u32 ecctype, clearval; enum dev_type dt; - u32 ecctype; - - dt = zynq_get_dtype(base); - if (dt == DEV_UNKNOWN) - return false;
- ecctype = readl(base + SCRUB_OFST) & SCRUB_MODE_MASK; - if ((ecctype == SCRUB_MODE_SECDED) && (dt == DEV_X2)) - return true; - - return false; -} - -/** - * zynqmp_get_ecc_state - Return the controller ECC enable/disable status. - * @base: DDR memory controller base address. - * - * Get the ECC enable/disable status for the controller. - * - * Return: a ECC status boolean i.e true/false - enabled/disabled. - */ -static bool zynqmp_get_ecc_state(void __iomem *base) -{ - enum dev_type dt; - u32 ecctype; - - dt = zynqmp_get_dtype(base); - if (dt == DEV_UNKNOWN) - return false; - - ecctype = readl(base + ECC_CFG0_OFST) & SCRUB_MODE_MASK; - if ((ecctype == SCRUB_MODE_SECDED) && - ((dt == DEV_X2) || (dt == DEV_X4) || (dt == DEV_X8))) - return true; + if (priv->p_data->platform == ZYNQ) { + dt = zynq_get_dtype(priv->baseaddr); + if (dt == DEV_UNKNOWN) + return false; + + ecctype = readl(priv->baseaddr + SCRUB_OFST) & SCRUB_MODE_MASK; + if (ecctype == SCRUB_MODE_SECDED && dt == DEV_X2) { + clearval = ECC_CTRL_CLR_CE_ERR | ECC_CTRL_CLR_UE_ERR; + writel(clearval, priv->baseaddr + ECC_CTRL_OFST); + writel(0x0, priv->baseaddr + ECC_CTRL_OFST); + return true; + } + } else { + dt = zynqmp_get_dtype(priv->baseaddr); + if (dt == DEV_UNKNOWN) + return false; + + ecctype = readl(priv->baseaddr + ECC_CFG0_OFST) & SCRUB_MODE_MASK; + if (ecctype == SCRUB_MODE_SECDED && + (dt == DEV_X2 || dt == DEV_X4 || dt == DEV_X8)) { + clearval = readl(priv->baseaddr + ECC_CLR_OFST) | + ECC_CTRL_CLR_CE_ERR | ECC_CTRL_CLR_CE_ERRCNT | + ECC_CTRL_CLR_UE_ERR | ECC_CTRL_CLR_UE_ERRCNT; + writel(clearval, priv->baseaddr + ECC_CLR_OFST); + return true; + } + }
return false; } @@ -934,18 +927,18 @@ static int setup_irq(struct mem_ctl_info *mci, }
static const struct synps_platform_data zynq_edac_def = { + .platform = ZYNQ, .get_error_info = zynq_get_error_info, .get_mtype = zynq_get_mtype, .get_dtype = zynq_get_dtype, - .get_ecc_state = zynq_get_ecc_state, .quirks = 0, };
static const struct synps_platform_data zynqmp_edac_def = { + .platform = ZYNQMP, .get_error_info = zynqmp_get_error_info, .get_mtype = zynqmp_get_mtype, .get_dtype = zynqmp_get_dtype, - .get_ecc_state = zynqmp_get_ecc_state, #ifdef CONFIG_EDAC_DEBUG .get_mem_info = zynqmp_get_mem_info, #endif @@ -957,10 +950,10 @@ static const struct synps_platform_data zynqmp_edac_def = { };
static const struct synps_platform_data synopsys_edac_def = { + .platform = SYNPS, .get_error_info = zynqmp_get_error_info, .get_mtype = zynqmp_get_mtype, .get_dtype = zynqmp_get_dtype, - .get_ecc_state = zynqmp_get_ecc_state, .quirks = (DDR_ECC_INTR_SUPPORT | DDR_ECC_INTR_SELF_CLEAR #ifdef CONFIG_EDAC_DEBUG | DDR_ECC_DATA_POISON_SUPPORT @@ -1392,10 +1385,6 @@ static int mc_probe(struct platform_device *pdev) if (!p_data) return -ENODEV;
- if (!p_data->get_ecc_state(baseaddr)) { - edac_printk(KERN_INFO, EDAC_MC, "ECC not enabled\n"); - return -ENXIO; - }
layers[0].type = EDAC_MC_LAYER_CHIP_SELECT; layers[0].size = SYNPS_EDAC_NR_CSROWS; @@ -1415,6 +1404,12 @@ static int mc_probe(struct platform_device *pdev) priv = mci->pvt_info; priv->baseaddr = baseaddr; priv->p_data = p_data; + if (!get_ecc_state(priv)) { + edac_printk(KERN_INFO, EDAC_MC, "ECC not enabled\n"); + rc = -ENODEV; + goto free_edac_mc; + } + spin_lock_init(&priv->reglock);
mc_init(mci, pdev);