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Date: Fri, 1 Apr 2022 15:20:12 +0300
From: Oded Gabbay <ogabbay@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Dafna Hirschfeld <dhirschfeld@...ana.ai>
Subject: [PATCH 2/7] habanalabs: unify code for memory access from debugfs
From: Dafna Hirschfeld <dhirschfeld@...ana.ai>
Currently each asic version implements 4 callbacks:
'debugfs_{read32/write32/read64/write64}'
There is a lot of code duplication among the different
callbacks of all asic versions.
This patch unify the code in order to avoid the code
duplication by iterating the pci_mem_region array
in hl_device and use its fields instead of macros.
Signed-off-by: Dafna Hirschfeld <dhirschfeld@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
drivers/misc/habanalabs/common/debugfs.c | 156 +++++++++++++++--------
1 file changed, 104 insertions(+), 52 deletions(-)
diff --git a/drivers/misc/habanalabs/common/debugfs.c b/drivers/misc/habanalabs/common/debugfs.c
index 30c637eaf59b..02b20a7b8119 100644
--- a/drivers/misc/habanalabs/common/debugfs.c
+++ b/drivers/misc/habanalabs/common/debugfs.c
@@ -11,6 +11,7 @@
#include <linux/pci.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
+#include <linux/iommu.h>
#define MMU_ADDR_BUF_SIZE 40
#define MMU_ASID_BUF_SIZE 10
@@ -647,13 +648,102 @@ static int device_va_to_pa(struct hl_device *hdev, u64 virt_addr, u32 size,
return rc;
}
+static int hl_access_dev_mem_by_region(struct hl_device *hdev, u64 addr,
+ u64 *val, enum debugfs_access_type acc_type, bool *found)
+{
+ size_t acc_size = (acc_type == DEBUGFS_READ64 || acc_type == DEBUGFS_WRITE64) ?
+ sizeof(u64) : sizeof(u32);
+ struct pci_mem_region *mem_reg;
+ int i;
+
+ for (i = 0; i < PCI_REGION_NUMBER; i++) {
+ mem_reg = &hdev->pci_mem_region[i];
+ if (!mem_reg->used)
+ continue;
+ if (addr >= mem_reg->region_base &&
+ addr <= mem_reg->region_base + mem_reg->region_size - acc_size) {
+ *found = true;
+ return hdev->asic_funcs->access_dev_mem(hdev, mem_reg, i,
+ addr, val, acc_type);
+ }
+ }
+ return 0;
+}
+
+static void hl_access_host_mem(struct hl_device *hdev, u64 addr, u64 *val,
+ enum debugfs_access_type acc_type)
+{
+ struct asic_fixed_properties *prop = &hdev->asic_prop;
+ u64 offset = prop->device_dma_offset_for_host_access;
+
+ switch (acc_type) {
+ case DEBUGFS_READ32:
+ *val = *(u32 *) phys_to_virt(addr - offset);
+ break;
+ case DEBUGFS_WRITE32:
+ *(u32 *) phys_to_virt(addr - offset) = *val;
+ break;
+ case DEBUGFS_READ64:
+ *val = *(u64 *) phys_to_virt(addr - offset);
+ break;
+ case DEBUGFS_WRITE64:
+ *(u64 *) phys_to_virt(addr - offset) = *val;
+ break;
+ }
+}
+
+static int hl_access_mem(struct hl_device *hdev, u64 addr, u64 *val,
+ enum debugfs_access_type acc_type)
+{
+ size_t acc_size = (acc_type == DEBUGFS_READ64 || acc_type == DEBUGFS_WRITE64) ?
+ sizeof(u64) : sizeof(u32);
+ u64 host_start = hdev->asic_prop.host_base_address;
+ u64 host_end = hdev->asic_prop.host_end_address;
+ bool user_address, found = false;
+ int rc;
+
+ user_address = hl_is_device_va(hdev, addr);
+ if (user_address) {
+ rc = device_va_to_pa(hdev, addr, acc_size, &addr);
+ if (rc)
+ return rc;
+ }
+
+ rc = hl_access_dev_mem_by_region(hdev, addr, val, acc_type, &found);
+ if (rc) {
+ dev_err(hdev->dev,
+ "Failed reading addr %#llx from dev mem (%d)\n",
+ addr, rc);
+ return rc;
+ }
+
+ if (found)
+ return 0;
+
+ if (!user_address || iommu_present(&pci_bus_type)) {
+ rc = -EINVAL;
+ goto err;
+ }
+
+ if (addr >= host_start && addr <= host_end - acc_size) {
+ hl_access_host_mem(hdev, addr, val, acc_type);
+ } else {
+ rc = -EINVAL;
+ goto err;
+ }
+
+ return 0;
+err:
+ dev_err(hdev->dev, "invalid addr %#llx\n", addr);
+ return rc;
+}
+
static ssize_t hl_data_read32(struct file *f, char __user *buf,
size_t count, loff_t *ppos)
{
struct hl_dbg_device_entry *entry = file_inode(f)->i_private;
struct hl_device *hdev = entry->hdev;
- u64 addr = entry->addr;
- bool user_address;
+ u64 value64, addr = entry->addr;
char tmp_buf[32];
ssize_t rc;
u32 val;
@@ -666,18 +756,11 @@ static ssize_t hl_data_read32(struct file *f, char __user *buf,
if (*ppos)
return 0;
- user_address = hl_is_device_va(hdev, addr);
- if (user_address) {
- rc = device_va_to_pa(hdev, addr, sizeof(val), &addr);
- if (rc)
- return rc;
- }
-
- rc = hdev->asic_funcs->debugfs_read32(hdev, addr, user_address, &val);
- if (rc) {
- dev_err(hdev->dev, "Failed to read from 0x%010llx\n", addr);
+ rc = hl_access_mem(hdev, addr, &value64, DEBUGFS_READ32);
+ if (rc)
return rc;
- }
+
+ val = value64; /* downcast back to 32 */
sprintf(tmp_buf, "0x%08x\n", val);
return simple_read_from_buffer(buf, count, ppos, tmp_buf,
@@ -689,8 +772,7 @@ static ssize_t hl_data_write32(struct file *f, const char __user *buf,
{
struct hl_dbg_device_entry *entry = file_inode(f)->i_private;
struct hl_device *hdev = entry->hdev;
- u64 addr = entry->addr;
- bool user_address;
+ u64 value64, addr = entry->addr;
u32 value;
ssize_t rc;
@@ -703,19 +785,10 @@ static ssize_t hl_data_write32(struct file *f, const char __user *buf,
if (rc)
return rc;
- user_address = hl_is_device_va(hdev, addr);
- if (user_address) {
- rc = device_va_to_pa(hdev, addr, sizeof(value), &addr);
- if (rc)
- return rc;
- }
-
- rc = hdev->asic_funcs->debugfs_write32(hdev, addr, user_address, value);
- if (rc) {
- dev_err(hdev->dev, "Failed to write 0x%08x to 0x%010llx\n",
- value, addr);
+ value64 = value;
+ rc = hl_access_mem(hdev, addr, &value64, DEBUGFS_WRITE32);
+ if (rc)
return rc;
- }
return count;
}
@@ -726,7 +799,6 @@ static ssize_t hl_data_read64(struct file *f, char __user *buf,
struct hl_dbg_device_entry *entry = file_inode(f)->i_private;
struct hl_device *hdev = entry->hdev;
u64 addr = entry->addr;
- bool user_address;
char tmp_buf[32];
ssize_t rc;
u64 val;
@@ -739,18 +811,9 @@ static ssize_t hl_data_read64(struct file *f, char __user *buf,
if (*ppos)
return 0;
- user_address = hl_is_device_va(hdev, addr);
- if (user_address) {
- rc = device_va_to_pa(hdev, addr, sizeof(val), &addr);
- if (rc)
- return rc;
- }
-
- rc = hdev->asic_funcs->debugfs_read64(hdev, addr, user_address, &val);
- if (rc) {
- dev_err(hdev->dev, "Failed to read from 0x%010llx\n", addr);
+ rc = hl_access_mem(hdev, addr, &val, DEBUGFS_READ64);
+ if (rc)
return rc;
- }
sprintf(tmp_buf, "0x%016llx\n", val);
return simple_read_from_buffer(buf, count, ppos, tmp_buf,
@@ -763,7 +826,6 @@ static ssize_t hl_data_write64(struct file *f, const char __user *buf,
struct hl_dbg_device_entry *entry = file_inode(f)->i_private;
struct hl_device *hdev = entry->hdev;
u64 addr = entry->addr;
- bool user_address;
u64 value;
ssize_t rc;
@@ -776,19 +838,9 @@ static ssize_t hl_data_write64(struct file *f, const char __user *buf,
if (rc)
return rc;
- user_address = hl_is_device_va(hdev, addr);
- if (user_address) {
- rc = device_va_to_pa(hdev, addr, sizeof(value), &addr);
- if (rc)
- return rc;
- }
-
- rc = hdev->asic_funcs->debugfs_write64(hdev, addr, user_address, value);
- if (rc) {
- dev_err(hdev->dev, "Failed to write 0x%016llx to 0x%010llx\n",
- value, addr);
+ rc = hl_access_mem(hdev, addr, &value, DEBUGFS_WRITE64);
+ if (rc)
return rc;
- }
return count;
}
--
2.25.1
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