Re: [PATCH v7 3/4] remoteproc: qcom: Make secure world call for mem ownership switch

From: Dwivedi, Avaneesh Kumar (avani)
Date: Mon Oct 16 2017 - 09:18:42 EST




On 10/12/2017 11:48 PM, Bjorn Andersson wrote:
On Fri 21 Jul 03:49 PDT 2017, Avaneesh Kumar Dwivedi wrote:

MSS proc on msm8996 can not access fw loaded region without stage
second translation of memory pages where mpss image are loaded.
This patch in order to enable mss boot on msm8996 invoke scm call
to switch or share ownership between apps and modem.

Signed-off-by: Avaneesh Kumar Dwivedi <akdwived@xxxxxxxxxxxxxx>
---
drivers/remoteproc/qcom_q6v5_pil.c | 90 ++++++++++++++++++++++++++++++++++++--
1 file changed, 87 insertions(+), 3 deletions(-)

diff --git a/drivers/remoteproc/qcom_q6v5_pil.c b/drivers/remoteproc/qcom_q6v5_pil.c
[..]
+static int q6v5_xfer_mem_ownership(struct q6v5 *qproc, int *current_perm,
+ bool remote_owner, phys_addr_t addr,
+ size_t size)
+{
+ struct qcom_scm_vmperm next;
+ int ret;
+
+ if (!qproc->need_mem_protection)
+ return 0;
+ if (remote_owner && *current_perm == BIT(QCOM_SCM_VMID_MSS_MSA))
+ return 0;
+ if (!remote_owner && *current_perm == BIT(QCOM_SCM_VMID_HLOS))
+ return 0;
+
+ next.vmid = remote_owner ? QCOM_SCM_VMID_MSS_MSA : QCOM_SCM_VMID_HLOS;
+ next.perm = remote_owner ? QCOM_SCM_PERM_RW : QCOM_SCM_PERM_RWX;
+
+ ret = qcom_scm_assign_mem(addr, ALIGN(size, SZ_4K),
+ *current_perm, &next, 1);
+ if (ret < 0) {
+ pr_err("Failed to assign memory access in range %p to %p to %s ret = %d\n",
+ (void *)addr, (void *)(addr + size),
+ remote_owner ? "mss" : "hlos", ret);
qcom_scm_assign_mem() also prints an error when this happens, there's no
need for that. I'm happy with you dropping the print from
qcom_scm_assign_mem() and keeping this one.

+ return ret;
+ }
+
+ *current_perm = ret;
+ return 0;
+}
+
static int q6v5_load(struct rproc *rproc, const struct firmware *fw)
{
struct q6v5 *qproc = rproc->priv;
@@ -450,6 +484,8 @@ static int q6v5_mpss_init_image(struct q6v5 *qproc, const struct firmware *fw)
{
unsigned long dma_attrs = DMA_ATTR_FORCE_CONTIGUOUS;
dma_addr_t phys;
+ int mdata_perm;
+ int xferop_ret;
void *ptr;
int ret;
@@ -461,6 +497,12 @@ static int q6v5_mpss_init_image(struct q6v5 *qproc, const struct firmware *fw)
memcpy(ptr, fw->data, fw->size);
+ /* Hypervisor mapping to access metadata by modem */
+ mdata_perm = BIT(QCOM_SCM_VMID_HLOS);
+ ret = q6v5_xfer_mem_ownership(qproc, &mdata_perm,
+ 1, phys, fw->size);
Please use "true" instead of "1".
OK Sure, will do it.
+ if (ret)
+ return -EAGAIN;
Please keep a empty line here, to keep the "paragraphs" or "chunks" of
code split up.
OK.

writel(phys, qproc->rmb_base + RMB_PMI_META_DATA_REG);
writel(RMB_CMD_META_DATA_READY, qproc->rmb_base + RMB_MBA_COMMAND_REG);
Regards,
Bjorn
--
To unsubscribe from this list: send the line "unsubscribe linux-remoteproc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html

--
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.