[Nouveau] [PATCH 3/9] pci: implement generic code for PCIe speed change
Karol Herbst
nouveau at karolherbst.de
Mon Oct 12 13:27:44 PDT 2015
Signed-off-by: Karol Herbst <nouveau at karolherbst.de>
---
drm/nouveau/include/nvkm/subdev/pci.h | 12 +++
drm/nouveau/nvkm/subdev/pci/Kbuild | 1 +
drm/nouveau/nvkm/subdev/pci/base.c | 5 ++
drm/nouveau/nvkm/subdev/pci/pcie.c | 159 ++++++++++++++++++++++++++++++++++
drm/nouveau/nvkm/subdev/pci/priv.h | 12 +++
5 files changed, 189 insertions(+)
create mode 100644 drm/nouveau/nvkm/subdev/pci/pcie.c
diff --git a/drm/nouveau/include/nvkm/subdev/pci.h b/drm/nouveau/include/nvkm/subdev/pci.h
index 17fe7b7..e195736 100644
--- a/drm/nouveau/include/nvkm/subdev/pci.h
+++ b/drm/nouveau/include/nvkm/subdev/pci.h
@@ -2,6 +2,12 @@
#define __NVKM_PCI_H__
#include <core/subdev.h>
+enum nvkm_pcie_speed {
+ NVKM_PCIE_SPEED_2_5,
+ NVKM_PCIE_SPEED_5_0,
+ NVKM_PCIE_SPEED_8_0,
+};
+
struct nvkm_pci {
const struct nvkm_pci_func *func;
struct nvkm_subdev subdev;
@@ -18,6 +24,11 @@ struct nvkm_pci {
bool acquired;
} agp;
+ struct {
+ enum nvkm_pcie_speed last_speed;
+ u8 last_width;
+ } pcie;
+
bool msi;
};
@@ -26,6 +37,7 @@ void nvkm_pci_wr08(struct nvkm_pci *, u16 addr, u8 data);
void nvkm_pci_wr32(struct nvkm_pci *, u16 addr, u32 data);
u32 nvkm_pci_mask(struct nvkm_pci *, u16 addr, u32 mask, u32 value);
void nvkm_pci_rom_shadow(struct nvkm_pci *, bool shadow);
+int nvkm_pci_set_pcie_link(struct nvkm_pci *, enum nvkm_pcie_speed, u8 width);
int nv04_pci_new(struct nvkm_device *, int, struct nvkm_pci **);
int nv40_pci_new(struct nvkm_device *, int, struct nvkm_pci **);
diff --git a/drm/nouveau/nvkm/subdev/pci/Kbuild b/drm/nouveau/nvkm/subdev/pci/Kbuild
index 724afd4..3c2519f 100644
--- a/drm/nouveau/nvkm/subdev/pci/Kbuild
+++ b/drm/nouveau/nvkm/subdev/pci/Kbuild
@@ -1,5 +1,6 @@
nvkm-y += nvkm/subdev/pci/agp.o
nvkm-y += nvkm/subdev/pci/base.o
+nvkm-y += nvkm/subdev/pci/pcie.o
nvkm-y += nvkm/subdev/pci/nv04.o
nvkm-y += nvkm/subdev/pci/nv40.o
nvkm-y += nvkm/subdev/pci/nv46.o
diff --git a/drm/nouveau/nvkm/subdev/pci/base.c b/drm/nouveau/nvkm/subdev/pci/base.c
index d671dcf..3895ab2 100644
--- a/drm/nouveau/nvkm/subdev/pci/base.c
+++ b/drm/nouveau/nvkm/subdev/pci/base.c
@@ -117,6 +117,9 @@ nvkm_pci_init(struct nvkm_subdev *subdev)
ret = nvkm_agp_init(pci);
if (ret)
return ret;
+ } else {
+ if (pci_is_pcie(pci->pdev))
+ nvkm_pci_pcie_init(pci);
}
if (pci->func->init)
@@ -160,6 +163,8 @@ nvkm_pci_new_(const struct nvkm_pci_func *func, struct nvkm_device *device,
pci->func = func;
pci->pdev = device->func->pci(device)->pdev;
pci->irq = -1;
+ pci->pcie.last_speed = -1;
+ pci->pcie.last_width = -1;
if (device->type == NVKM_DEVICE_AGP)
nvkm_agp_ctor(pci);
diff --git a/drm/nouveau/nvkm/subdev/pci/pcie.c b/drm/nouveau/nvkm/subdev/pci/pcie.c
new file mode 100644
index 0000000..05e9c55
--- /dev/null
+++ b/drm/nouveau/nvkm/subdev/pci/pcie.c
@@ -0,0 +1,159 @@
+/*
+ * Copyright 2015 Karol Herbst
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Karol Herbst <git at karolherbst.de>
+ */
+#include "priv.h"
+
+static char *pcie_speed_strings[] = {
+ "2.5GT/s",
+ "5.0GT/s",
+ "8.0GT/s",
+};
+
+static enum nvkm_pcie_speed
+pci_bus_speed_to_nvkm_pcie_speed(enum pci_bus_speed speed)
+{
+ switch (speed) {
+ case PCIE_SPEED_2_5GT:
+ return NVKM_PCIE_SPEED_2_5;
+ case PCIE_SPEED_5_0GT:
+ return NVKM_PCIE_SPEED_5_0;
+ case PCIE_SPEED_8_0GT:
+ return NVKM_PCIE_SPEED_8_0;
+ default:
+ if (speed == 0x17) // 0x16 is 8_0, assume 0x17 will be 16_0 for now
+ return NVKM_PCIE_SPEED_8_0;
+ return -1;
+ }
+}
+
+static s8
+nvkm_pci_get_pcie_version(struct nvkm_pci *pci)
+{
+ if (!pci_is_pcie(pci->pdev))
+ return -ENODEV;
+
+ if (!pci->func->get_pcie_version)
+ return -ENOSYS;
+
+ return pci->func->get_pcie_version(pci);
+}
+
+static s8
+nvkm_pci_raise_pcie_version(struct nvkm_pci *pci)
+{
+ int ret, supported;
+
+ if (!pci_is_pcie(pci->pdev))
+ return -ENODEV;
+
+ if (!pci->func->set_pcie_version || !pci->func->get_pcie_version_supported)
+ return -ENOSYS;
+
+ ret = nvkm_pci_get_pcie_version(pci);
+ supported = pci->func->get_pcie_version_supported(pci);
+ if (ret == 1 && ret < supported) {
+ nvkm_debug(&pci->subdev, "raising version\n");
+ pci->func->set_pcie_version(pci, supported);
+ ret = nvkm_pci_get_pcie_version(pci);
+ }
+ return ret >= supported ? ret : -EINVAL;
+}
+
+int
+nvkm_pci_pcie_init(struct nvkm_pci *pci)
+{
+ struct nvkm_subdev *subdev = &pci->subdev;
+ int ret;
+
+ if (!pci_is_pcie(pci->pdev))
+ return -ENODEV;
+
+ // raise pcie version first
+ ret = nvkm_pci_raise_pcie_version(pci);
+ if (ret <= 0)
+ nvkm_error(subdev, "couldn't raise version: %i\n", ret);
+
+ if (pci->func->pcie_speed_init)
+ pci->func->pcie_speed_init(pci);
+
+ nvkm_info(subdev, "pcie version: %i\n", nvkm_pci_get_pcie_version(pci));
+ if (pci->func->pcie_max_speed)
+ nvkm_info(subdev, "pcie max speed: %s\n", pcie_speed_strings[pci->func->pcie_max_speed(pci)]);
+
+ if (pci->pcie.last_speed != -1)
+ nvkm_pci_set_pcie_link(pci, pci->pcie.last_speed, pci->pcie.last_width);
+
+ return 0;
+}
+
+int
+nvkm_pci_set_pcie_link(struct nvkm_pci * pci, enum nvkm_pcie_speed req_speed, u8 req_width)
+{
+ struct nvkm_subdev *subdev = &pci->subdev;
+ enum nvkm_pcie_speed sys_cur_speed, sys_max_speed;
+ struct pci_bus *pbus = pci->pdev->bus;
+ int ret;
+
+ if (!pci_is_pcie(pci->pdev))
+ return -ENODEV;
+
+ if (!pci->func->pcie_speed_set || !pci->func->get_pcie_version || !pci->func->pcie_max_speed || !pci->func->pcie_current_speed)
+ return -ENOSYS;
+
+ nvkm_debug(subdev, "pcie speed %s requested\n", pcie_speed_strings[req_speed]);
+
+ if (pci->func->get_pcie_version(pci) < 2) {
+ nvkm_error(subdev, "can't change link speed, "
+ "because current version too low\n");
+ return -ENODEV;
+ }
+
+ sys_cur_speed = pci->func->pcie_current_speed(pci);
+ sys_max_speed = min(pci_bus_speed_to_nvkm_pcie_speed(pbus->max_bus_speed), pci->func->pcie_max_speed(pci));
+
+ nvkm_debug(subdev, "bus current speed: %s max speed: %s\n",
+ pcie_speed_strings[sys_cur_speed], pcie_speed_strings[sys_max_speed]);
+
+ if (req_speed > sys_max_speed) {
+ req_speed = sys_max_speed;
+ nvkm_warn(subdev, "bus or card not fast enough, dropping "
+ "requested speed to %s", pcie_speed_strings[req_speed]);
+ }
+
+ pci->pcie.last_speed = req_speed;
+ pci->pcie.last_width = req_width;
+
+ if (req_speed == sys_cur_speed) {
+ nvkm_debug(subdev, "requested speed matches current speed already\n");
+ return req_speed;
+ }
+
+ nvkm_debug(subdev, "set link to speed: %s width: x%i\n",
+ pcie_speed_strings[req_speed], req_width);
+ ret = pci->func->pcie_speed_set(pci, req_speed, req_width);
+
+ if (ret < 0)
+ nvkm_error(subdev, "setting link failed with ret: %i\n", ret);
+
+ return ret;
+}
diff --git a/drm/nouveau/nvkm/subdev/pci/priv.h b/drm/nouveau/nvkm/subdev/pci/priv.h
index cf46d38..11c266f 100644
--- a/drm/nouveau/nvkm/subdev/pci/priv.h
+++ b/drm/nouveau/nvkm/subdev/pci/priv.h
@@ -12,6 +12,16 @@ struct nvkm_pci_func {
void (*wr08)(struct nvkm_pci *, u16 addr, u8 data);
void (*wr32)(struct nvkm_pci *, u16 addr, u32 data);
void (*msi_rearm)(struct nvkm_pci *);
+
+ int (*pcie_speed_init)(struct nvkm_pci *);
+ int (*pcie_speed_set)(struct nvkm_pci *, enum nvkm_pcie_speed, u8);
+
+ enum nvkm_pcie_speed (*pcie_max_speed)(struct nvkm_pci *);
+ enum nvkm_pcie_speed (*pcie_current_speed)(struct nvkm_pci *);
+
+ void (*set_pcie_version)(struct nvkm_pci *, u8);
+ u8 (*get_pcie_version)(struct nvkm_pci *);
+ u8 (*get_pcie_version_supported)(struct nvkm_pci *);
};
u32 nv40_pci_rd32(struct nvkm_pci *, u16);
@@ -22,4 +32,6 @@ void nv40_pci_msi_rearm(struct nvkm_pci *);
void nv46_pci_msi_rearm(struct nvkm_pci *);
void g84_pci_init(struct nvkm_pci *pci);
+
+int nvkm_pci_pcie_init(struct nvkm_pci *pci);
#endif
--
2.6.1
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