[PATCH v11 16/26] firmware: qcom_scm: Register Gunyah platform ops
Srinivas Kandagatla
srinivas.kandagatla at linaro.org
Tue Mar 21 07:24:19 PDT 2023
Hi Elliot,
On 04/03/2023 01:06, Elliot Berman wrote:
> Qualcomm platforms have a firmware entity which performs access control
> to physical pages. Dynamically started Gunyah virtual machines use the
> QCOM_SCM_RM_MANAGED_VMID for access. Linux thus needs to assign access
> to the memory used by guest VMs. Gunyah doesn't do this operation for us
> since it is the current VM (typically VMID_HLOS) delegating the access
> and not Gunyah itself. Use the Gunyah platform ops to achieve this so
> that only Qualcomm platforms attempt to make the needed SCM calls.
>
> Co-developed-by: Prakruthi Deepak Heragu <quic_pheragu at quicinc.com>
> Signed-off-by: Prakruthi Deepak Heragu <quic_pheragu at quicinc.com>
> Signed-off-by: Elliot Berman <quic_eberman at quicinc.com>
> ---
> drivers/firmware/Kconfig | 2 +
> drivers/firmware/qcom_scm.c | 100 +++++++++++++++++++++++++++++++++
> include/linux/gunyah_rsc_mgr.h | 2 +-
> 3 files changed, 103 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
> index b59e3041fd62..b888068ff6f2 100644
> --- a/drivers/firmware/Kconfig
> +++ b/drivers/firmware/Kconfig
> @@ -214,6 +214,8 @@ config MTK_ADSP_IPC
>
> config QCOM_SCM
> tristate
> + select VIRT_DRIVERS
> + select GUNYAH_PLATFORM_HOOKS
>
I still have concerns with this selects in Kconfig on older Qualcomm
platforms that use SCM and do not have GUNYAH.
In our last discussing you mentioned the requirement for
"CONFIG_GUNYAH=y and CONFIG_QCOM_SCM=m"
I think that should be doable and remove selecting if you can make a
separate GUNYAH_QCOM_PLATFORM_HOOKS driver
Does this work?
>----------------------->cut<-------------------------------
From 1fb7995aecf17caefd09ffb516579bc4ac9ac301 Mon Sep 17 00:00:00 2001
From: Srinivas Kandagatla <srinivas.kandagatla at linaro.org>
Date: Tue, 21 Mar 2023 13:34:02 +0000
Subject: [PATCH] virt: gunyah: add qcom platform hooks
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla at linaro.org>
---
drivers/firmware/Kconfig | 2 --
drivers/firmware/qcom_scm.c | 14 +++-----
drivers/virt/gunyah/Kconfig | 5 +++
drivers/virt/gunyah/Makefile | 1 +
.../virt/gunyah/gunyah_qcom_platform_hooks.c | 35 +++++++++++++++++++
include/linux/firmware/qcom/qcom_scm.h | 3 ++
6 files changed, 48 insertions(+), 12 deletions(-)
create mode 100644 drivers/virt/gunyah/gunyah_qcom_platform_hooks.c
diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index b888068ff6f2..b59e3041fd62 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -214,8 +214,6 @@ config MTK_ADSP_IPC
config QCOM_SCM
tristate
- select VIRT_DRIVERS
- select GUNYAH_PLATFORM_HOOKS
config QCOM_SCM_DOWNLOAD_MODE_DEFAULT
bool "Qualcomm download mode enabled by default"
diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index 5273cf64ee2a..194ea2bc9a1d 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -1301,7 +1301,7 @@ int qcom_scm_lmh_dcvsh(u32 payload_fn, u32
payload_reg, u32 payload_val,
}
EXPORT_SYMBOL(qcom_scm_lmh_dcvsh);
-static int qcom_scm_gh_rm_pre_mem_share(struct gh_rm *rm, struct
gh_rm_mem_parcel *mem_parcel)
+int qcom_scm_gh_rm_pre_mem_share(struct gh_rm_mem_parcel *mem_parcel)
{
struct qcom_scm_vmperm *new_perms;
u64 src, src_cpy;
@@ -1359,8 +1359,9 @@ static int qcom_scm_gh_rm_pre_mem_share(struct
gh_rm *rm, struct gh_rm_mem_parce
kfree(new_perms);
return ret;
}
+EXPORT_SYMBOL_GPL(qcom_scm_gh_rm_pre_mem_share);
-static int qcom_scm_gh_rm_post_mem_reclaim(struct gh_rm *rm, struct
gh_rm_mem_parcel *mem_parcel)
+int qcom_scm_gh_rm_post_mem_reclaim(struct gh_rm_mem_parcel *mem_parcel)
{
struct qcom_scm_vmperm new_perms;
u64 src = 0, src_cpy;
@@ -1388,11 +1389,7 @@ static int qcom_scm_gh_rm_post_mem_reclaim(struct
gh_rm *rm, struct gh_rm_mem_pa
return ret;
}
-
-static struct gh_rm_platform_ops qcom_scm_gh_rm_platform_ops = {
- .pre_mem_share = qcom_scm_gh_rm_pre_mem_share,
- .post_mem_reclaim = qcom_scm_gh_rm_post_mem_reclaim,
-};
+EXPORT_SYMBOL_GPL(qcom_scm_gh_rm_post_mem_reclaim);
static int qcom_scm_find_dload_address(struct device *dev, u64 *addr)
{
@@ -1597,9 +1594,6 @@ static int qcom_scm_probe(struct platform_device
*pdev)
if (download_mode)
qcom_scm_set_download_mode(true);
- if (devm_gh_rm_register_platform_ops(&pdev->dev,
&qcom_scm_gh_rm_platform_ops))
- dev_warn(__scm->dev, "Gunyah RM platform ops were already registered\n");
-
return 0;
}
diff --git a/drivers/virt/gunyah/Kconfig b/drivers/virt/gunyah/Kconfig
index bd8e31184962..a9c48d6518f7 100644
--- a/drivers/virt/gunyah/Kconfig
+++ b/drivers/virt/gunyah/Kconfig
@@ -16,6 +16,11 @@ config GUNYAH
config GUNYAH_PLATFORM_HOOKS
tristate
+config GUNYAH_QCOM_PLATFORM_HOOKS
+ tristate "Gunyah Platform hooks for Qualcomm"
+ depends on ARCH_QCOM && QCOM_SCM
+ depends on GUNYAH
+
config GUNYAH_VCPU
tristate "Runnable Gunyah vCPUs"
depends on GUNYAH
diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile
index 7347b1470491..c33f701bb5c8 100644
--- a/drivers/virt/gunyah/Makefile
+++ b/drivers/virt/gunyah/Makefile
@@ -2,6 +2,7 @@
obj-$(CONFIG_GUNYAH) += gunyah.o
obj-$(CONFIG_GUNYAH_PLATFORM_HOOKS) += gunyah_platform_hooks.o
+obj-$(CONFIG_GUNYAH_QCOM_PLATFORM_HOOKS) += gunyah_qcom_platform_hooks.o
gunyah_rsc_mgr-y += rsc_mgr.o rsc_mgr_rpc.o vm_mgr.o vm_mgr_mm.o
obj-$(CONFIG_GUNYAH) += gunyah_rsc_mgr.o
diff --git a/drivers/virt/gunyah/gunyah_qcom_platform_hooks.c
b/drivers/virt/gunyah/gunyah_qcom_platform_hooks.c
new file mode 100644
index 000000000000..3332f84134d3
--- /dev/null
+++ b/drivers/virt/gunyah/gunyah_qcom_platform_hooks.c
@@ -0,0 +1,35 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/firmware/qcom/qcom_scm.h>
+#include <linux/gunyah_rsc_mgr.h>
+
+static int qcom_gh_rm_pre_mem_share(struct gh_rm *rm, struct
gh_rm_mem_parcel *mem_parcel)
+{
+ return qcom_scm_gh_rm_pre_mem_share(mem_parcel);
+}
+
+static int qcom_gh_rm_post_mem_reclaim(struct gh_rm *rm, struct
gh_rm_mem_parcel *mem_parcel)
+{
+ return qcom_scm_gh_rm_post_mem_reclaim(mem_parcel);
+}
+
+static struct gh_rm_platform_ops qcom_gh_platform_hooks_ops = {
+ .pre_mem_share = qcom_gh_rm_pre_mem_share,
+ .post_mem_reclaim = qcom_gh_rm_post_mem_reclaim,
+};
+
+static int __init qcom_gh_platform_hooks_register(void)
+{
+ return gh_rm_register_platform_ops(&qcom_gh_platform_hooks_ops);
+}
+
+static void __exit qcom_gh_platform_hooks_unregister(void)
+{
+ gh_rm_unregister_platform_ops(&qcom_gh_platform_hooks_ops);
+}
+
+module_init(qcom_gh_platform_hooks_register);
+module_exit(qcom_gh_platform_hooks_unregister);
+
+MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Gunyah Platform Hooks
driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/firmware/qcom/qcom_scm.h
b/include/linux/firmware/qcom/qcom_scm.h
index 1e449a5d7f5c..9b0d33db803d 100644
--- a/include/linux/firmware/qcom/qcom_scm.h
+++ b/include/linux/firmware/qcom/qcom_scm.h
@@ -121,5 +121,8 @@ extern int qcom_scm_lmh_dcvsh(u32 payload_fn, u32
payload_reg, u32 payload_val,
u64 limit_node, u32 node_id, u64 version);
extern int qcom_scm_lmh_profile_change(u32 profile_id);
extern bool qcom_scm_lmh_dcvsh_available(void);
+struct gh_rm_mem_parcel;
+extern int qcom_scm_gh_rm_post_mem_reclaim(struct gh_rm_mem_parcel
*mem_parcel);
+extern int qcom_scm_gh_rm_pre_mem_share(struct gh_rm_mem_parcel
*mem_parcel);
#endif
--------------------------->cut<-----------------------
> config QCOM_SCM_DOWNLOAD_MODE_DEFAULT
> bool "Qualcomm download mode enabled by default"
> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
> index b95616b35bff..89a261a9e021 100644
> --- a/drivers/firmware/qcom_scm.c
> +++ b/drivers/firmware/qcom_scm.c
> @@ -20,6 +20,7 @@
> #include <linux/clk.h>
> #include <linux/reset-controller.h>
> #include <linux/arm-smccc.h>
> +#include <linux/gunyah_rsc_mgr.h>
>
> #include "qcom_scm.h"
>
> @@ -30,6 +31,9 @@ module_param(download_mode, bool, 0);
> #define SCM_HAS_IFACE_CLK BIT(1)
> #define SCM_HAS_BUS_CLK BIT(2)
>
> +#define QCOM_SCM_RM_MANAGED_VMID 0x3A
> +#define QCOM_SCM_MAX_MANAGED_VMID 0x3F
> +
> struct qcom_scm {
> struct device *dev;
> struct clk *core_clk;
> @@ -1299,6 +1303,99 @@ int qcom_scm_lmh_dcvsh(u32 payload_fn, u32 payload_reg, u32 payload_val,
> }
> EXPORT_SYMBOL(qcom_scm_lmh_dcvsh);
>
> +static int qcom_scm_gh_rm_pre_mem_share(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel)
> +{
> + struct qcom_scm_vmperm *new_perms;
> + u64 src, src_cpy;
> + int ret = 0, i, n;
> + u16 vmid;
> +
> + new_perms = kcalloc(mem_parcel->n_acl_entries, sizeof(*new_perms), GFP_KERNEL);
> + if (!new_perms)
> + return -ENOMEM;
> +
> + for (n = 0; n < mem_parcel->n_acl_entries; n++) {
> + vmid = le16_to_cpu(mem_parcel->acl_entries[n].vmid);
> + if (vmid <= QCOM_SCM_MAX_MANAGED_VMID)
> + new_perms[n].vmid = vmid;
> + else
> + new_perms[n].vmid = QCOM_SCM_RM_MANAGED_VMID;
> + if (mem_parcel->acl_entries[n].perms & GH_RM_ACL_X)
> + new_perms[n].perm |= QCOM_SCM_PERM_EXEC;
> + if (mem_parcel->acl_entries[n].perms & GH_RM_ACL_W)
> + new_perms[n].perm |= QCOM_SCM_PERM_WRITE;
> + if (mem_parcel->acl_entries[n].perms & GH_RM_ACL_R)
> + new_perms[n].perm |= QCOM_SCM_PERM_READ;
> + }
> +
> + src = (1ull << QCOM_SCM_VMID_HLOS);
> +
> + for (i = 0; i < mem_parcel->n_mem_entries; i++) {
> + src_cpy = src;
> + ret = qcom_scm_assign_mem(le64_to_cpu(mem_parcel->mem_entries[i].ipa_base),
> + le64_to_cpu(mem_parcel->mem_entries[i].size),
> + &src_cpy, new_perms, mem_parcel->n_acl_entries);
> + if (ret) {
> + src = 0;
> + for (n = 0; n < mem_parcel->n_acl_entries; n++) {
> + vmid = le16_to_cpu(mem_parcel->acl_entries[n].vmid);
> + if (vmid <= QCOM_SCM_MAX_MANAGED_VMID)
> + src |= (1ull << vmid);
> + else
> + src |= (1ull << QCOM_SCM_RM_MANAGED_VMID);
> + }
> +
> + new_perms[0].vmid = QCOM_SCM_VMID_HLOS;
> +
> + for (i--; i >= 0; i--) {
> + src_cpy = src;
> + WARN_ON_ONCE(qcom_scm_assign_mem(
> + le64_to_cpu(mem_parcel->mem_entries[i].ipa_base),
> + le64_to_cpu(mem_parcel->mem_entries[i].size),
> + &src_cpy, new_perms, 1));
> + }
> + break;
> + }
> + }
> +
> + kfree(new_perms);
> + return ret;
> +}
> +
> +static int qcom_scm_gh_rm_post_mem_reclaim(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel)
> +{
> + struct qcom_scm_vmperm new_perms;
> + u64 src = 0, src_cpy;
> + int ret = 0, i, n;
> + u16 vmid;
> +
> + new_perms.vmid = QCOM_SCM_VMID_HLOS;
> + new_perms.perm = QCOM_SCM_PERM_EXEC | QCOM_SCM_PERM_WRITE | QCOM_SCM_PERM_READ;
> +
> + for (n = 0; n < mem_parcel->n_acl_entries; n++) {
> + vmid = le16_to_cpu(mem_parcel->acl_entries[n].vmid);
> + if (vmid <= QCOM_SCM_MAX_MANAGED_VMID)
> + src |= (1ull << vmid);
> + else
> + src |= (1ull << QCOM_SCM_RM_MANAGED_VMID);
> + }
> +
> + for (i = 0; i < mem_parcel->n_mem_entries; i++) {
> + src_cpy = src;
> + ret = qcom_scm_assign_mem(le64_to_cpu(mem_parcel->mem_entries[i].ipa_base),
> + le64_to_cpu(mem_parcel->mem_entries[i].size),
> + &src_cpy, &new_perms, 1);
> + WARN_ON_ONCE(ret);
> + }
> +
> + return ret;
> +}
> +
> +static struct gh_rm_platform_ops qcom_scm_gh_rm_platform_ops = {
> + .pre_mem_share = qcom_scm_gh_rm_pre_mem_share,
> + .post_mem_reclaim = qcom_scm_gh_rm_post_mem_reclaim,
> +};
> +
> static int qcom_scm_find_dload_address(struct device *dev, u64 *addr)
> {
> struct device_node *tcsr;
> @@ -1502,6 +1599,9 @@ static int qcom_scm_probe(struct platform_device *pdev)
> if (download_mode)
> qcom_scm_set_download_mode(true);
>
> + if (devm_gh_rm_register_platform_ops(&pdev->dev, &qcom_scm_gh_rm_platform_ops))
> + dev_warn(__scm->dev, "Gunyah RM platform ops were already registered\n");
> +
> return 0;
> }
>
> diff --git a/include/linux/gunyah_rsc_mgr.h b/include/linux/gunyah_rsc_mgr.h
> index 515087931a2b..acf8c1545a6c 100644
> --- a/include/linux/gunyah_rsc_mgr.h
> +++ b/include/linux/gunyah_rsc_mgr.h
> @@ -145,7 +145,7 @@ int gh_rm_get_hyp_resources(struct gh_rm *rm, u16 vmid,
> struct gh_rm_hyp_resources **resources);
> int gh_rm_get_vmid(struct gh_rm *rm, u16 *vmid);
>
> -struct gunyah_rm_platform_ops {
> +struct gh_rm_platform_ops {
> int (*pre_mem_share)(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel);
> int (*post_mem_reclaim)(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel);
> };
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