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authorSuman Anna <s-anna@ti.com>2020-03-24 13:00:23 +0200
committerBjorn Andersson <bjorn.andersson@linaro.org>2020-03-25 22:29:47 -0700
commitfeae0300536a9220d2d696798ef3952d612ac73d (patch)
tree73063bd603e1d0dc54d4bc6db2e51c0fde351bf9 /drivers/remoteproc/omap_remoteproc.c
parent75242927014f532b9a04c4c2fb74566e2b0da70a (diff)
remoteproc/omap: Add a sanity check for DSP boot address alignment
The DSP remote processors on OMAP SoCs require a boot register to be programmed with a boot address, and this boot address needs to be on a 1KB boundary. The current code is simply masking the boot address appropriately without performing any sanity checks before releasing the resets. An unaligned boot address results in an undefined execution behavior and can result in various bus errors like MMU Faults or L3 NoC errors. Such errors are hard to debug and can be easily avoided by adding a sanity check for the alignment before booting a DSP remote processor. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Tero Kristo <t-kristo@ti.com> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Reviewed-by: Andrew F. Davis <afd@ti.com> Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200324110035.29907-4-t-kristo@ti.com Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Diffstat (limited to 'drivers/remoteproc/omap_remoteproc.c')
-rw-r--r--drivers/remoteproc/omap_remoteproc.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/drivers/remoteproc/omap_remoteproc.c b/drivers/remoteproc/omap_remoteproc.c
index d47d5ded651a..fe11cb709770 100644
--- a/drivers/remoteproc/omap_remoteproc.c
+++ b/drivers/remoteproc/omap_remoteproc.c
@@ -121,14 +121,23 @@ static void omap_rproc_kick(struct rproc *rproc, int vqid)
* @rproc: handle of a remote processor
*
* Set boot address for a supported DSP remote processor.
+ *
+ * Return: 0 on success, or -EINVAL if boot address is not aligned properly
*/
-static void omap_rproc_write_dsp_boot_addr(struct rproc *rproc)
+static int omap_rproc_write_dsp_boot_addr(struct rproc *rproc)
{
+ struct device *dev = rproc->dev.parent;
struct omap_rproc *oproc = rproc->priv;
struct omap_rproc_boot_data *bdata = oproc->boot_data;
u32 offset = bdata->boot_reg;
- regmap_write(bdata->syscon, offset, rproc->bootaddr);
+ if (rproc->bootaddr & (SZ_1K - 1)) {
+ dev_err(dev, "invalid boot address 0x%llx, must be aligned on a 1KB boundary\n",
+ rproc->bootaddr);
+ return -EINVAL;
+ }
+
+ return regmap_write(bdata->syscon, offset, rproc->bootaddr);
}
/*
@@ -145,8 +154,11 @@ static int omap_rproc_start(struct rproc *rproc)
int ret;
struct mbox_client *client = &oproc->client;
- if (oproc->boot_data)
- omap_rproc_write_dsp_boot_addr(rproc);
+ if (oproc->boot_data) {
+ ret = omap_rproc_write_dsp_boot_addr(rproc);
+ if (ret)
+ return ret;
+ }
client->dev = dev;
client->tx_done = NULL;